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<div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Commenced</strong> in January 2007</div> </div> </div> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Frequency:</strong> Monthly</div> </div> </div> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Edition:</strong> International</div> </div> </div> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Paper Count:</strong> 1262</div> </div> </div> </div> <h1 class="mt-3 mb-3 text-center" style="font-size:1.6rem;">Search results for: up-flow anaerobic sludge blanket reactor</h1> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1262</span> A Study on the Effect of Cod to Sulphate Ratio on Performance of Lab Scale Upflow Anaerobic Sludge Blanket Reactor</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Neeraj%20Sahu">Neeraj Sahu</a>, <a href="https://publications.waset.org/abstracts/search?q=Ahmad%20Saadiq"> Ahmad Saadiq</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Anaerobic sulphate reduction has the potential for being effective and economically viable over conventional treatment methods for the treatment of sulphate-rich wastewater. However, a major challenge in anaerobic sulphate reduction is the diversion of a fraction of organic carbon towards methane production and some minor problem such as odour problems, corrosion, and increase of effluent chemical oxygen demand. A high-rate anaerobic technology has encouraged researchers to extend its application to the treatment of complex wastewaters with relatively low cost and energy consumption compared to physicochemical methods. Therefore, the aim of this study was to investigate the effects of COD/SO₄²⁻ ratio on the performance of lab scale UASB reactor. A lab-scale upflow anaerobic sludge blanket (UASB) reactor was operated for 170 days. In which first 60 days, for successful start-up with acclimation under methanogenesis and sulphidogenesis at COD/SO₄²⁻ of 18 and were operated at COD/SO₄²⁻ ratios of 12, 8, 4 and 1 to evaluate the effects of the presence of sulfate on the reactor performance. The reactor achieved maximum COD removal efficiency and biogas evolution at the end of acclimation (control). This phase lasted 53 days with 89.5% efficiency. The biogas was 0.6 L/d at (OLR) of 1.0 kg COD/m³d when it was treating synthetic wastewater with effective volume of reactor as 2.8 L. When COD/SO₄²⁻ ratio changed from 12 to 1, slight decrease in COD removal efficiencies (76.8–87.4%) was observed, biogas production decreased from 0.58 to 0.32 L/d, while the sulfate removal efficiency increased from 42.5% to 72.7%. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=anaerobic" title="anaerobic">anaerobic</a>, <a href="https://publications.waset.org/abstracts/search?q=chemical%20oxygen%20demand" title=" chemical oxygen demand"> chemical oxygen demand</a>, <a href="https://publications.waset.org/abstracts/search?q=organic%20loading%20rate" title=" organic loading rate"> organic loading rate</a>, <a href="https://publications.waset.org/abstracts/search?q=sulphate" title=" sulphate"> sulphate</a>, <a href="https://publications.waset.org/abstracts/search?q=up-flow%20anaerobic%20sludge%20blanket%20reactor" title=" up-flow anaerobic sludge blanket reactor"> up-flow anaerobic sludge blanket reactor</a> </p> <a href="https://publications.waset.org/abstracts/88716/a-study-on-the-effect-of-cod-to-sulphate-ratio-on-performance-of-lab-scale-upflow-anaerobic-sludge-blanket-reactor" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/88716.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">223</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1261</span> Comparison of an Upflow Anaerobic Sludge Blanket and an Anaerobic Filter for Treating Wheat Straw Washwater</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Syazwani%20Idrus">Syazwani Idrus</a>, <a href="https://publications.waset.org/abstracts/search?q=S.%20Charles%20J.%20Banks"> S. Charles J. Banks</a>, <a href="https://publications.waset.org/abstracts/search?q=Sonia%20Heaven"> Sonia Heaven</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The study compared the performance of upflow anaerobic sludge blanket (UASB) reactors and anaerobic filters (AF) for the treatment of wheat straw washwater (WSW) which has a high concentration of Potassium ions. The trial was conducted at mesophilic temperatures (37 °C). The digesters were started up over a 48-day period using a synthetic wastewater feed and reached an organic loading rate (OLR) of 6 g COD L^-1 day^-1 with a specific methane production (SMP) of 0.333 L CH4 g^-1 COD. When the feed was switched to WSW it was not possible to maintain the same loading rate as the SMP in all reactors fell sharply to less than 0.1 L CH4 g^-1 COD, with the AF affected more than the UASB. On reducing the OLR to 3 g COD L^-1 day^-1 the reactors recovered to produce 0.21 L CH4 g^-1 CODadded and gave 82% COD removal. A discrepancy between the COD consumed and the methane produced could be accounted for through increased maintenance energy requirement of the microbial community for osmo-regulation as K+ was found to accumulate in the sludge and in the UASB reached a concentration of 4.5 mg K g^-1 wet weight of granules. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=anaerobic%20digestion" title="anaerobic digestion">anaerobic digestion</a>, <a href="https://publications.waset.org/abstracts/search?q=osmotic%20stress" title=" osmotic stress"> osmotic stress</a>, <a href="https://publications.waset.org/abstracts/search?q=chemical%20oxygen%20demand" title=" chemical oxygen demand"> chemical oxygen demand</a>, <a href="https://publications.waset.org/abstracts/search?q=specific%20methane%20production" title=" specific methane production"> specific methane production</a> </p> <a href="https://publications.waset.org/abstracts/26374/comparison-of-an-upflow-anaerobic-sludge-blanket-and-an-anaerobic-filter-for-treating-wheat-straw-washwater" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/26374.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">660</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1260</span> Comparison of an Upflow Anaerobic Sludge Blanket and an Anaerobic Filter for Treating Wheat Straw Wash Water</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Syazwani%20Idrus">Syazwani Idrus</a>, <a href="https://publications.waset.org/abstracts/search?q=Charles%20Banks"> Charles Banks</a>, <a href="https://publications.waset.org/abstracts/search?q=Sonia%20Heaven"> Sonia Heaven</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The effect of osmotic stress was carried out to determine the ability for biogas production in two types of digesters; anaerobic sludge blanket and anaerobic filters in treating wheat straw washed water. Two anaerobic filters (AF1 and 2) and two UASB reactors (U1 and 2) with working volumes of 1.5 L were employed at mesophilic temperatures (37°C). Digesters AF1 and two were seeded with an inoculum which had previously been fed on with a synthetic wastewater includingSodium Chloride and Potassium Chloride. Digesters U1 and two were seeded with 1 kg wet weight of granular sludge which had previously been treating paper mill effluent. During the first 48 days, all digesters were successfully acclimated with synthetic wastewater (SW) to organic loading rate (OLR) of 6 g COD l^-1 day-1. Specific methane production (SMP) of 0.333 l CH4 g-1 COD). The feed was then changed to wash water from a washing operation to reduce the salt content of wheat straw (wheat straw wash water, WSW) at the same OLR. SMP fell sharply in all reactors to less than 0.1 l CH4 g^-1 COD, with the AF affected more than the UASB. The OLR was reduced to 2.5 g COD l^-1 day^-1 to allow adaptation to WSW, and both the UASB and the AF reactors achieved an SMP of 0.21 l CH4 g^-1 COD added at 82% of COD removal. This study also revealed the accumulation of potassium (K) inside the UASB granules to a concentration of 4.5 mg K g^-1 wet weight of granular sludge. The phenomenon of lower SMP and accumulation of K indicates the effect of osmotic stress when fed on WSW. This finding is consistent with the theory that methanogenic organisms operate a Potassium pump to maintain ionic equilibrium, and as this is an energy-driven process, it will, therefore, reduce the overall methane yield. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=wheat%20straw%20wash%20water" title="wheat straw wash water">wheat straw wash water</a>, <a href="https://publications.waset.org/abstracts/search?q=upflow%20anaerobic%20sludge%20blanket" title=" upflow anaerobic sludge blanket"> upflow anaerobic sludge blanket</a>, <a href="https://publications.waset.org/abstracts/search?q=anaerobic%20filter" title=" anaerobic filter"> anaerobic filter</a>, <a href="https://publications.waset.org/abstracts/search?q=specific%20methane%20production" title=" specific methane production"> specific methane production</a>, <a href="https://publications.waset.org/abstracts/search?q=osmotic%20stress" title=" osmotic stress"> osmotic stress</a> </p> <a href="https://publications.waset.org/abstracts/22643/comparison-of-an-upflow-anaerobic-sludge-blanket-and-an-anaerobic-filter-for-treating-wheat-straw-wash-water" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/22643.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">379</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1259</span> Electrifying Textile Wastewater Sludge through Up-flow Anaerobic Sludge Blanket Reactor for Sustainable Waste Management</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Tewodros%20Birhan">Tewodros Birhan</a>, <a href="https://publications.waset.org/abstracts/search?q=Tamrat%20Tesfaye"> Tamrat Tesfaye</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Energy supply and waste management are two of humanity's greatest challenges. The world's energy supply primarily relies on fossil fuels, which produce excessive carbon dioxide emissions when burned. When released into the atmosphere in high concentrations, these emissions contribute to global warming. Generating textile wastewater sludge from the Bahir Dar Textile Industry poses significant environmental challenges. This sludge, a byproduct of extensive dyeing and finishing processes, contains a variety of harmful chemicals and heavy metals that can contaminate soil and water resources. This research work explores sustainable waste management strategies, focusing on biogas production from textile wastewater sludge using up-flow anaerobic sludge blanket reactor technology. The objective was to harness biogas, primarily methane, as a renewable energy source while mitigating the environmental impact of textile wastewater disposal. Employing a Central Composite Design approach, experiments were meticulously designed to optimize process parameters. Two key factors, Carbon-to-Nitrogen ratio, and pH, were varied at different levels (20:1 and 25:1 for C: N ratio; 6.8 and 7.6 for pH) to evaluate their influence on methane yield. A 0.4m3 up-flow anaerobic sludge blanket reactor was constructed to facilitate the anaerobic digestion process. Over 26 days, the reactor underwent rigorous testing and monitoring to ascertain its efficiency in biogas production. Meticulous experimentation and data analysis found that the optimal conditions for maximizing methane yield were achieved. Notably, a methane yield of 56.4% was attained, which signifies the effectiveness of the up-flow anaerobic sludge blanket reactor in converting textile wastewater sludge into a valuable energy resource. The findings of this study hold significant implications for both environmental conservation and energy sustainability. Furthermore, the utilization of up-flow anaerobic sludge blanket reactor technology underscores its potential as a viable solution for biogas production from textile wastewater sludge, further promoting the transition towards a circular economy paradigm. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=anaerobic%20digestion" title="anaerobic digestion">anaerobic digestion</a>, <a href="https://publications.waset.org/abstracts/search?q=biogas%20energy" title=" biogas energy"> biogas energy</a>, <a href="https://publications.waset.org/abstracts/search?q=circular%20economy" title=" circular economy"> circular economy</a>, <a href="https://publications.waset.org/abstracts/search?q=textile%20sludge" title=" textile sludge"> textile sludge</a>, <a href="https://publications.waset.org/abstracts/search?q=waste-to-energy" title=" waste-to-energy"> waste-to-energy</a> </p> <a href="https://publications.waset.org/abstracts/195293/electrifying-textile-wastewater-sludge-through-up-flow-anaerobic-sludge-blanket-reactor-for-sustainable-waste-management" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/195293.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">17</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1258</span> Study of the Anaerobic Degradation Potential of High Strength Molasses Wastewater</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=M.%20Mischopoulou">M. Mischopoulou</a>, <a href="https://publications.waset.org/abstracts/search?q=P.%20Naidis"> P. Naidis</a>, <a href="https://publications.waset.org/abstracts/search?q=S.%20Kalamaras"> S. Kalamaras</a>, <a href="https://publications.waset.org/abstracts/search?q=T.%20Kotsopoulos"> T. Kotsopoulos</a>, <a href="https://publications.waset.org/abstracts/search?q=P.%20Samaras"> P. Samaras</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The treatment of high strength wastewater by an Upflow Anaerobic Sludge Blanket (UASB) reactor has several benefits, such as high organic removal efficiency, short hydraulic retention time along with low operating costs. In addition, high volumes of biogas are released in these reactors, which can be utilized in several industrial facilities for energy production. This study aims at the examination of the application potential of anaerobic treatment of wastewater, with high molasses content derived from yeast manufacturing, by a lab-scale UASB reactor. The molasses wastewater and the sludge used in the experiments were collected from the wastewater treatment plant of a baker’s yeast manufacturing company. The experimental set-up consisted of a 15 L thermostated UASB reactor at 37 ◦C. Before the reactor start-up, the reactor was filled with sludge and molasses wastewater at a ratio 1:1 v/v. Influent was fed to the reactor at a flowrate of 12 L/d, corresponding to a hydraulic residence time of about 30 h. Effluents were collected from the system outlet and were analyzed for the determination of the following parameters: COD, pH, total solids, volatile solids, ammonium, phosphates and total nitrogen according to the standard methods of analysis. In addition, volatile fatty acid (VFA) composition of the effluent was determined by a gas chromatograph equipped with a flame ionization detector (FID), as an indicator to evaluate the process efficiency. The volume of biogas generated in the reactor was daily measured by the water displacement method, while gas composition was analyzed by a gas chromatograph equipped with a thermal conductivity detector (TCD). The effluent quality was greatly enhanced due to the use of the UASB reactor and high rate of biogas production was observed. The anaerobic treatment of the molasses wastewater by the UASB reactor improved the biodegradation potential of the influent, resulting at high methane yields and an effluent with better quality than the raw wastewater. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=anaerobic%20digestion" title="anaerobic digestion">anaerobic digestion</a>, <a href="https://publications.waset.org/abstracts/search?q=biogas%20production" title=" biogas production"> biogas production</a>, <a href="https://publications.waset.org/abstracts/search?q=molasses%20wastewater" title=" molasses wastewater"> molasses wastewater</a>, <a href="https://publications.waset.org/abstracts/search?q=UASB%20reactor" title=" UASB reactor"> UASB reactor</a> </p> <a href="https://publications.waset.org/abstracts/21656/study-of-the-anaerobic-degradation-potential-of-high-strength-molasses-wastewater" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/21656.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">278</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1257</span> Identification of Microbial Community in an Anaerobic Reactor Treating Brewery Wastewater</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Abimbola%20M.%20Enitan">Abimbola M. Enitan</a>, <a href="https://publications.waset.org/abstracts/search?q=John%20O.%20Odiyo"> John O. Odiyo</a>, <a href="https://publications.waset.org/abstracts/search?q=Feroz%20M.%20Swalaha"> Feroz M. Swalaha</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The study of microbial ecology and their function in anaerobic digestion processes are essential to control the biological processes. This is to know the symbiotic relationship between the microorganisms that are involved in the conversion of complex organic matter in the industrial wastewater to simple molecules. In this study, diversity and quantity of bacterial community in the granular sludge taken from the different compartments of a full-scale upflow anaerobic sludge blanket (UASB) reactor treating brewery wastewater was investigated using polymerase chain reaction (PCR) and real-time quantitative PCR (qPCR). The phylogenetic analysis showed three major eubacteria phyla that belong to <em>Proteobacteria, Firmicutes </em>and<em> Chloroflexi</em> in the full-scale UASB reactor, with different groups populating different compartment. The result of qPCR assay showed high amount of eubacteria with increase in concentration along the reactor’s compartment. This study extends our understanding on the diverse, topological distribution and shifts in concentration of microbial communities in the different compartments of a full-scale UASB reactor treating brewery wastewater. The colonization and the trophic interactions among these microbial populations in reducing and transforming complex organic matter within the UASB reactors were established. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=bacteria" title="bacteria">bacteria</a>, <a href="https://publications.waset.org/abstracts/search?q=brewery%20wastewater" title=" brewery wastewater"> brewery wastewater</a>, <a href="https://publications.waset.org/abstracts/search?q=real-time%20quantitative%20PCR" title=" real-time quantitative PCR"> real-time quantitative PCR</a>, <a href="https://publications.waset.org/abstracts/search?q=UASB%20reactor" title=" UASB reactor"> UASB reactor</a> </p> <a href="https://publications.waset.org/abstracts/79480/identification-of-microbial-community-in-an-anaerobic-reactor-treating-brewery-wastewater" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/79480.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">263</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1256</span> Evaluating the Process of Biofuel Generation from Grass</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Karan%20Bhandari">Karan Bhandari</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Almost quarter region of Indian terrain is covered by grasslands. Grass being a low maintenance perennial crop is in abundance. Farmers are well acquainted with its nature, yield and storage. The aim of this paper is to study and identify the applicability of grass as a source of bio fuel. Anaerobic break down is a well-recognized technology. This process is vital for harnessing bio fuel from grass. Grass is a lignocellulosic material which is fibrous and can readily cause problems with parts in motion. Further, it also has a tendency to float. This paper also deals with the ideal digester configuration for biogas generation from grass. Intensive analysis of the literature is studied on the optimum production of grass storage in accordance with bio digester specifications. Subsequent to this two different digester systems were designed, fabricated, analyzed. The first setup was a double stage wet continuous arrangement usually known as a Continuously Stirred Tank Reactor (CSTR). The next was a double stage, double phase system implementing Sequentially Fed Leach Beds using an Upflow Anaerobic Sludge Blanket (SLBR-UASB). The above methodologies were carried for the same feedstock acquired from the same field. Examination of grass silage was undertaken using Biomethane Potential values. The outcomes portrayed that the Continuously Stirred Tank Reactor system produced about 450 liters of methane per Kg of volatile solids, at a detention period of 48 days. The second method involving Leach Beds produced about 340 liters of methane per Kg of volatile solids with a detention period of 28 days. The results showcased that CSTR when designed exclusively for grass proved to be extremely efficient in methane production. The SLBR-UASB has significant potential to allow for lower detention times with significant levels of methane production. This technology has immense future for research and development in India in terms utilizing of grass crop as a non-conventional source of fuel. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=biomethane%20potential%20values" title="biomethane potential values">biomethane potential values</a>, <a href="https://publications.waset.org/abstracts/search?q=bio%20digester%20specifications" title=" bio digester specifications"> bio digester specifications</a>, <a href="https://publications.waset.org/abstracts/search?q=continuously%20stirred%20tank%20reactor" title=" continuously stirred tank reactor"> continuously stirred tank reactor</a>, <a href="https://publications.waset.org/abstracts/search?q=upflow%20anaerobic%20sludge%20blanket" title=" upflow anaerobic sludge blanket"> upflow anaerobic sludge blanket</a> </p> <a href="https://publications.waset.org/abstracts/60567/evaluating-the-process-of-biofuel-generation-from-grass" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/60567.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">249</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1255</span> Up-Flow Sponge Submerged Biofilm Reactor for Municipal Sewage Treatment</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Saber%20A.%20El-Shafai">Saber A. El-Shafai</a>, <a href="https://publications.waset.org/abstracts/search?q=Waleed%20M.%20Zahid"> Waleed M. Zahid</a> </p> <p class="card-text"><strong>Abstract:</strong></p> An up-flow submerged biofilm reactor packed with sponge was investigated for sewage treatment. The reactor was operated two cycles as single aerobic (1-1 at 3.5 L/L.d HLR and 1-2 at 3.8 L/L.day HLR) and four cycles as single anaerobic/aerobic reactor; 2-1 and 2-2 at low HLR (3.7 and 3.5 L/L.day) and 2-3 and 2-4 at high HLR (5.1 and 5.4 L/L.day). During the aerobic cycles, 50% effluent recycling significantly reduces the system performance except for phosphorous. In case of the anaerobic/aerobic reactor, the effluent recycling, significantly improves system performance at low HLR while at high HLR only phosphorous removal was improved. Excess sludge production was limited to 0.133 g TSS/g COD with better sludge volume index (SVI) in case of anaerobic/aerobic cycles; (54.7 versus 58.5 ml/g). <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=aerobic" title="aerobic">aerobic</a>, <a href="https://publications.waset.org/abstracts/search?q=anaerobic%2Faerobic" title=" anaerobic/aerobic"> anaerobic/aerobic</a>, <a href="https://publications.waset.org/abstracts/search?q=up-flow" title=" up-flow"> up-flow</a>, <a href="https://publications.waset.org/abstracts/search?q=submerged%20biofilm" title=" submerged biofilm"> submerged biofilm</a>, <a href="https://publications.waset.org/abstracts/search?q=sponge" title=" sponge"> sponge</a> </p> <a href="https://publications.waset.org/abstracts/62018/up-flow-sponge-submerged-biofilm-reactor-for-municipal-sewage-treatment" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/62018.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">304</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1254</span> H2 Production and Treatment of Cake Wastewater Industry via Up-Flow Anaerobic Staged Reactor </h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Manal%20A.%20Mohsen">Manal A. Mohsen</a>, <a href="https://publications.waset.org/abstracts/search?q=Ahmed%20Tawfik"> Ahmed Tawfik</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Hydrogen production from cake wastewater by anaerobic dark fermentation via upflow anaerobic staged reactor (UASR) was investigated in this study. The reactor was continuously operated for four months at constant hydraulic retention time (HRT) of 21.57 hr, PH value of 6 ± 0.6, temperature of 21.1°C, and organic loading rate of 2.43 gCOD/l.d. The hydrogen production was 5.7 l H<sub>2</sub>/d and the hydrogen yield was 134.8 ml H<sub>2</sub> /g COD<sub>removed</sub>. The system showed an overall removal efficiency of TCOD, TBOD, TSS, TKN, and Carbohydrates of 40 ± 13%, 59 ± 18%, 84 ± 17%, 28 ± 27%, and 85 ± 15% respectively during the long term operation period. Based on the available results, the system is not sufficient for the effective treatment of cake wastewater, and the effluent quality of UASR is not complying for discharge into sewerage network, therefore a post treatment is needed (not covered in this study). <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=cake%20wastewater%20industry" title="cake wastewater industry">cake wastewater industry</a>, <a href="https://publications.waset.org/abstracts/search?q=chemical%20oxygen%20demand%20%28COD%29" title=" chemical oxygen demand (COD)"> chemical oxygen demand (COD)</a>, <a href="https://publications.waset.org/abstracts/search?q=hydrogen%20production" title=" hydrogen production"> hydrogen production</a>, <a href="https://publications.waset.org/abstracts/search?q=up-flow%20anaerobic%20staged%20reactor%20%28UASR%29" title=" up-flow anaerobic staged reactor (UASR)"> up-flow anaerobic staged reactor (UASR)</a> </p> <a href="https://publications.waset.org/abstracts/40013/h2-production-and-treatment-of-cake-wastewater-industry-via-up-flow-anaerobic-staged-reactor" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/40013.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">385</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1253</span> Separate Production of Hydrogen and Methane from Ethanol Wastewater Using Two-Stage UASB: Micronutrient Transportation</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=S.%20Jaikeaw">S. Jaikeaw</a>, <a href="https://publications.waset.org/abstracts/search?q=S.%20Chavadej"> S. Chavadej</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The objective of this study was to determine the effects of COD loading rate on hydrogen and methane production and micronutrient transportation using a two-stage upflow anaerobic sludge blanket (UASB) system under mesophilic temperature (37°C) with a constant recycle ratio of 1:1 (final effluent flow rate: feed flow rate). The first (hydrogen) UASB unit having 4 L liquid holding volume was controlled at pH 5.5 but the second (methane) UASB unit having 24 L liquid holding volume had no pH control. The two-stage UASB system operated at different COD loading rates from 8 to 20 kg/m³d based on total UASB working volume. The results showed that, at the optimum COD loading rate of 13 kg/m³d, the produced gas from the hydrogen UASB unit contained 1.5% H₂, 16.5% CH₄, and 82% CO₂ with H₂S of 252 ppm and also provided a hydrogen yield of 1.66 mL/g COD removed (or 0.56 mL/g COD applied) and a specific hydrogen production rate of 156.85 ml H₂/LRd (or 5.12 ml H₂/g MLVSS d). Under the optimum COD loading rate, the produced gas from the methane UASB unit mainly contained methane and carbon dioxide without hydrogen of 74 and 26%, respectively with hydrogen sulfide of 287 ppm and the system also provided a maximum methane yield of 407.00 mL/g COD removed (or 263.23 mL/g COD applied) and a specific methane production rate of 2081.44 ml CH₄/LRd (or 99.75 ml CH₄/g MLVSS d). Under the optimum COD loading rate, all micronutrients markedly dropped by the sulfide precipitation reactions. The reduction of micronutrients mostly appeared in the methane UASB unit. Under the studied conditions, both Co and Ni were found to be greatly precipitated out, causing the deficiency to microbial activity. It is hypothesized that an addition of both Co and Ni can improve the methanogenic activity. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=hydrogen%20and%20methane%20production" title="hydrogen and methane production">hydrogen and methane production</a>, <a href="https://publications.waset.org/abstracts/search?q=ethanol%20wastewater" title=" ethanol wastewater"> ethanol wastewater</a>, <a href="https://publications.waset.org/abstracts/search?q=a%20two-stage%20upflow%20anaerobic%20blanket%20%28UASB%29%20system" title=" a two-stage upflow anaerobic blanket (UASB) system"> a two-stage upflow anaerobic blanket (UASB) system</a>, <a href="https://publications.waset.org/abstracts/search?q=mesophillic%20temperature" title=" mesophillic temperature"> mesophillic temperature</a>, <a href="https://publications.waset.org/abstracts/search?q=microbial%20concentration%20%28MLVSS%29" title=" microbial concentration (MLVSS)"> microbial concentration (MLVSS)</a>, <a href="https://publications.waset.org/abstracts/search?q=micronutrients" title=" micronutrients"> micronutrients</a> </p> <a href="https://publications.waset.org/abstracts/66190/separate-production-of-hydrogen-and-methane-from-ethanol-wastewater-using-two-stage-uasb-micronutrient-transportation" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/66190.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">291</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1252</span> Renewable Energy Potential of Diluted Poultry Manure during Ambient Anaerobic Stabilisation </h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Cigdem%20Yangin-Gomec">Cigdem Yangin-Gomec</a>, <a href="https://publications.waset.org/abstracts/search?q=Aigerim%20Jaxybayeva"> Aigerim Jaxybayeva</a>, <a href="https://publications.waset.org/abstracts/search?q=Orhan%20Ince"> Orhan Ince</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In this study, the anaerobic treatability of chicken manure diluted with tap water (with an influent feed ratio of 1 kg of fresh chicken manure to 6 liter of tap water) was investigated in a lab-scale anaerobic sludge bed (ASB) reactor inoculated with the granular sludge already adapted to chicken manure. The raw waste digested in this study was the manure from laying-hens having average total solids (TS) of about 30% with ca. 60% volatile content. The ASB reactor was fed semi-continuously at ambient operating temperature range (17-23<sup>◦</sup>C) at a HRT of 13 and 26 days for about 6 months, respectively. The respective average total and soluble chemical oxygen demand (COD) removals were ca. 90% and 75%, whereas average biomethane production rate was calculated ca. 180 lt per kg of COD<sub>removed</sub> from the ASB reactor at an average HRT of 13 days. Moreover, total suspended solids (TSS) and volatile suspended solids (VSS) in the influent were reduced more than 97%. Hence, high removals of the organic compounds with respective biogas production made anaerobic stabilization of the diluted chicken manure by ASB reactor at ambient operating temperatures viable. By this way, external heating up to 35<sup>◦</sup>C (i.e. anaerobic processes have been traditionally operated at mesophilic conditions) could be avoided in the scope of this study. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=ambient%20anaerobic%20digestion" title="ambient anaerobic digestion">ambient anaerobic digestion</a>, <a href="https://publications.waset.org/abstracts/search?q=biogas%20recovery" title=" biogas recovery"> biogas recovery</a>, <a href="https://publications.waset.org/abstracts/search?q=poultry%20manure" title=" poultry manure"> poultry manure</a>, <a href="https://publications.waset.org/abstracts/search?q=renewable%20energy" title=" renewable energy"> renewable energy</a> </p> <a href="https://publications.waset.org/abstracts/40062/renewable-energy-potential-of-diluted-poultry-manure-during-ambient-anaerobic-stabilisation" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/40062.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">427</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1251</span> Investigating the Efficiency of Granular Sludge for Recovery of Phosphate from Wastewater</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Sara%20Salehi">Sara Salehi</a>, <a href="https://publications.waset.org/abstracts/search?q=Ka%20Yu%20Cheng"> Ka Yu Cheng</a>, <a href="https://publications.waset.org/abstracts/search?q=Anna%20Heitz"> Anna Heitz</a>, <a href="https://publications.waset.org/abstracts/search?q=Maneesha%20Ginige"> Maneesha Ginige</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This study investigated the efficiency of granular sludge for phosphorous (P) recovery from wastewater. A laboratory scale sequencing batch reactor (SBR) was operated under alternating aerobic/anaerobic conditions to enrich a P accumulating granular biomass. This study showed that an overall 45-fold increase in P concentration could be achieved by reducing the volume of the P capturing liquor by 5-fold in the anaerobic P release phase. Moreover, different fractions of the granular biomass have different individual contributions towards generating a concentrated stream of P. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=granular%20sludge" title="granular sludge">granular sludge</a>, <a href="https://publications.waset.org/abstracts/search?q=PAOs" title=" PAOs"> PAOs</a>, <a href="https://publications.waset.org/abstracts/search?q=P%20recovery" title=" P recovery"> P recovery</a>, <a href="https://publications.waset.org/abstracts/search?q=SBR" title=" SBR"> SBR</a> </p> <a href="https://publications.waset.org/abstracts/64159/investigating-the-efficiency-of-granular-sludge-for-recovery-of-phosphate-from-wastewater" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/64159.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">490</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1250</span> Performance of an Anaerobic Baffled Reactor (ABR) during Start-Up Period</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=D.%20M.%20Bassuney">D. M. Bassuney</a>, <a href="https://publications.waset.org/abstracts/search?q=W.%20A.%20Ibrahim"> W. A. Ibrahim</a>, <a href="https://publications.waset.org/abstracts/search?q=Medhat%20A.%20E.%20Moustafa"> Medhat A. E. Moustafa</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Appropriate start-up of an anaerobic baffled reactor (ABR) is considered to be the most delicate and important issue in the anaerobic process, and depends on several factors such as wastewater composition, reactor configuration, inoculum and operating conditions. In this work, the start-up performance of an ABR with working volume of 30 liters, fed continuously with synthetic food industrial wastewater along with semi-batch study to measure the methangenic activity by specific methanogenic activity (SMA) test were carried out at various organic loading rates (OLRs) to determine the best OLR used to start up the reactor. The comparison was based on COD removal efficiencies, start-up time, pH stability and methane production. An OLR of 1.8 Kg COD/m3d (5400 gCOD/m3 and 3 days HRT) showed best overall performance with COD removal efficiency of 94.44% after four days from the feeding and methane production of 3802 ml/L with an overall SMA of 0.36 gCH4-COD/gVS.d <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=anaerobic%20baffled%20reactor" title="anaerobic baffled reactor">anaerobic baffled reactor</a>, <a href="https://publications.waset.org/abstracts/search?q=anaerobic%20reactor%20start-up" title=" anaerobic reactor start-up"> anaerobic reactor start-up</a>, <a href="https://publications.waset.org/abstracts/search?q=food%20industrial%20wastewater" title=" food industrial wastewater"> food industrial wastewater</a>, <a href="https://publications.waset.org/abstracts/search?q=specific%20methanogenic%20activity" title=" specific methanogenic activity"> specific methanogenic activity</a> </p> <a href="https://publications.waset.org/abstracts/9694/performance-of-an-anaerobic-baffled-reactor-abr-during-start-up-period" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/9694.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">395</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1249</span> The Study on Energy Saving in Clarification Process for Water Treatment Plant</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Wiwat%20Onnakklum">Wiwat Onnakklum</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Clarification is the turbidity removal process of water treatment plant. This paper was to study the factors affecting on energy consumption in order to control energy saving strategy. The factors studied were raw water turbidity in the range of 26-40 NTU and production rate in the range of 3.76-5.20 m³/sec. Clarifiers were sludge blanket and sludge recirculation clarifier. Experimental results found that the raw water turbidity was not affected significantly by energy consumption, while the production rate was affected significantly by energy consumption. Sludge blanket clarifier provided lower energy consumption than sludge recirculation clarifier about 32-37%. Subsequently, the operating pattern in production rate can be arranged to decreased energy consumption. The results showed that it can be reduced about 5.09 % of energy saving of clarification process about 754,655 Baht per year. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=sludge%20blanket%20clarifier" title="sludge blanket clarifier">sludge blanket clarifier</a>, <a href="https://publications.waset.org/abstracts/search?q=sludge%20recirculation%20clarifier" title=" sludge recirculation clarifier"> sludge recirculation clarifier</a>, <a href="https://publications.waset.org/abstracts/search?q=water%20treatment%20plant" title=" water treatment plant"> water treatment plant</a>, <a href="https://publications.waset.org/abstracts/search?q=energy" title=" energy"> energy</a> </p> <a href="https://publications.waset.org/abstracts/74988/the-study-on-energy-saving-in-clarification-process-for-water-treatment-plant" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/74988.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">329</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1248</span> Two-Stage Anaerobic Digester for Biogas Production from Sewage Sludge: A Case Study in One of Kuwait’s Wastewater Treatment Plant</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Abdullah%20Almatouq">Abdullah Almatouq</a>, <a href="https://publications.waset.org/abstracts/search?q=Abdulla%20Abusam"> Abdulla Abusam</a>, <a href="https://publications.waset.org/abstracts/search?q=Hussain%20Hussain"> Hussain Hussain</a>, <a href="https://publications.waset.org/abstracts/search?q=Mishari%20Khajah"> Mishari Khajah</a>, <a href="https://publications.waset.org/abstracts/search?q=Hussain%20Abdullah"> Hussain Abdullah</a>, <a href="https://publications.waset.org/abstracts/search?q=Rashed%20Al-Yaseen"> Rashed Al-Yaseen</a>, <a href="https://publications.waset.org/abstracts/search?q=Mariam%20Al-Jumaa"> Mariam Al-Jumaa</a>, <a href="https://publications.waset.org/abstracts/search?q=Farah%20Al-Ajeel"> Farah Al-Ajeel</a>, <a href="https://publications.waset.org/abstracts/search?q=Mohammad%20Aljassam"> Mohammad Aljassam</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Due to the high demand for energy from unsustainable resources in Kuwait, the Kuwaiti government has focused recently on using sustainable resources for energy, such as solar and wind energy. In addition, sludge which is generated as a by-product of physical, chemical, and biological processes during wastewater treatment, can be used as a substrate to generate energy through anaerobic digestion. Kuwait’s wastewater treatment plants produce more than 1.7 million m3 of sludge per year, and this volume is accumulated in the treatment plants without any treatment. Therefore, a pilot-scale (3 m3) two-stage anaerobic digester was constructed in one of the largest treatment plants in Kuwait. The reactor was operated in batch mode, and the hydraulic retention time varied between 14 – 27 days. The main of this study is to evaluate the technical feasibility of a two-stage anaerobic digester for sludge treatability and energy generation in Kuwait. The anaerobic digester achieved a total biogas production of 37 m3, and the highest value of daily biogas production was 0.4 m3/day. The methane content ranged between 50 % and 66 %, and the other gases were as follows: CO2 20 %, H2S 13 %, and 1 % O2. The generated biogas was used on-site for cooking and lighting. In some batches, low C/N was noticed, and that lead to maintaining the concentration of CH4 between 50%-55%. In conclusion, an anaerobic digester is an environmentally friendly technology that can be applied in Kuwait, and the obtained results support the scale-up of the process in all the treatment plants. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=wastewater" title="wastewater">wastewater</a>, <a href="https://publications.waset.org/abstracts/search?q=metahne" title=" metahne"> metahne</a>, <a href="https://publications.waset.org/abstracts/search?q=biogas%20production%20potential" title=" biogas production potential"> biogas production potential</a>, <a href="https://publications.waset.org/abstracts/search?q=anaerobic%20digestion" title=" anaerobic digestion"> anaerobic digestion</a> </p> <a href="https://publications.waset.org/abstracts/162875/two-stage-anaerobic-digester-for-biogas-production-from-sewage-sludge-a-case-study-in-one-of-kuwaits-wastewater-treatment-plant" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/162875.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">125</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1247</span> Municipal Sewage Sludge as Co-Substrate in Anaerobic Digestion of Vegetable Waste and Biogas Yield</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=J.%20V.%20Thanikal">J. V. Thanikal</a>, <a href="https://publications.waset.org/abstracts/search?q=M.%20Torrijos"> M. Torrijos</a>, <a href="https://publications.waset.org/abstracts/search?q=Philipe%20Sousbie"> Philipe Sousbie</a>, <a href="https://publications.waset.org/abstracts/search?q=S.%20M.%20Rizwan"> S. M. Rizwan</a>, <a href="https://publications.waset.org/abstracts/search?q=R.%20Senthil%20Kumar"> R. Senthil Kumar</a>, <a href="https://publications.waset.org/abstracts/search?q=Hatem%20Yezdi"> Hatem Yezdi</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Co-digestion is one of the advantages of anaerobic digestion process because; several wastes having complimentary characteristics can be treated in a single process. The anaerobic co-digestion process, which can be defined as the simultaneous treatment of two –or more – organic biodegradable waste streams by anaerobic digestion offers great potential for the proper disposal of the organic fraction of solid waste coming from source or separate collection systems. The results of biogas production for sewage sludge, when used as a single substrate, were low (350ml/d), and also the biodegradation rate was slow. Sewage sludge as a co-substrate did not show much effect on biogas yield. The vegetable substrates (Potato, Carrot, Spinach) with a total charge of 27–36 g VS, with a HRT starting from 3 days and ending with 1 day, shown a considerable increase in biogas yield 3.5-5 l/d. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=anaerobic%20digestion" title="anaerobic digestion">anaerobic digestion</a>, <a href="https://publications.waset.org/abstracts/search?q=co-digestion" title=" co-digestion"> co-digestion</a>, <a href="https://publications.waset.org/abstracts/search?q=vegetable%20substrate" title=" vegetable substrate"> vegetable substrate</a>, <a href="https://publications.waset.org/abstracts/search?q=sewage%20sludge" title=" sewage sludge"> sewage sludge</a> </p> <a href="https://publications.waset.org/abstracts/14047/municipal-sewage-sludge-as-co-substrate-in-anaerobic-digestion-of-vegetable-waste-and-biogas-yield" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/14047.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">579</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1246</span> Anaerobic Co-Digestion of Duckweed (Lemna gibba) and Waste Activated Sludge in Batch Mode</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Rubia%20Gaur">Rubia Gaur</a>, <a href="https://publications.waset.org/abstracts/search?q=Surindra%20Suthar"> Surindra Suthar</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The present study investigates the anaerobic co-digestion of duckweed (Lemna gibba) and waste activated sludge (WAS) of different proportions with acclimatized anaerobic granular sludge (AAGS) as inoculum in mesophilic conditions. Batch experiments were performed in 500 mL capacity reagent bottles at 300C temperature. Varied combinations of pre-treated duckweed biomass with constant volume of anaerobic inoculum (AAGS - 100 mL) and waste activated sludge (WAS - 22.5 mL) were devised into five batch tests. The highest methane generation was observed with batch study, T4. The Gompertz model fits well on the experimental data of the batch study, T4. The values of correlation coefficient were achieved relatively higher (R2 ≥ 0.99). The co-digestion without pre-treatment of both duckweed and WAS shows poor generation of methane gas. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=aquatic%20weed" title="aquatic weed">aquatic weed</a>, <a href="https://publications.waset.org/abstracts/search?q=biogas" title=" biogas"> biogas</a>, <a href="https://publications.waset.org/abstracts/search?q=biomass" title=" biomass"> biomass</a>, <a href="https://publications.waset.org/abstracts/search?q=Gompertz%20equation" title=" Gompertz equation"> Gompertz equation</a>, <a href="https://publications.waset.org/abstracts/search?q=waste%20activated%20sludge" title=" waste activated sludge"> waste activated sludge</a> </p> <a href="https://publications.waset.org/abstracts/57321/anaerobic-co-digestion-of-duckweed-lemna-gibba-and-waste-activated-sludge-in-batch-mode" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/57321.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">288</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1245</span> Improvement Anaerobic Digestion Performance of Sewage Sludge by Co-Digestion with Cattle Manure</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Raouf%20Hassan">Raouf Hassan</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Biogas energy production from sewage sludge is an economically feasible and eco-friendly in nature. Sewage sludge is considered nutrient-rich substrates, but had lower values of carbone which consider an energy source for anaerobic bacteria. The lack or lower values of carbone-to-nitrogen ratio (C/N) reduced biogas yield and fermentation rate. Anaerobic co-digestion of sewage sludge offers several benefits over mono-digestion such as optimize nutrient balance, increased cost-efficiency and increased degradation rate. The high produced amounts of animal manures, which reach up to 90% of the total collected organic wastes, are recommended for the co-digestion with sewage sludge, especially with the limitations of industrial substrates. Moreover, cattle manures had high methane production potential (500 m3/t vsadded). When mixed with sewage sludge the potential methane production increased with increasing cattle manure content. In this paper, the effect of cattle manure (CM) addition as co-substrates on the sewage sludge (SS) anaerobic digestion performance was investigated under mesophilic conditions (35°C) using anaerobic batch reactors. The batch reactors were operated with a working volume 0.8 liter, and a hydraulic retention time of 30 days. The research work focus on studying two main parameters; the biogas yield (expressed as VSS) and pH values inside the reactors. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=anaerobic%20digestion" title="anaerobic digestion">anaerobic digestion</a>, <a href="https://publications.waset.org/abstracts/search?q=sewage%20sludge" title=" sewage sludge"> sewage sludge</a>, <a href="https://publications.waset.org/abstracts/search?q=cattle%20manure" title=" cattle manure"> cattle manure</a>, <a href="https://publications.waset.org/abstracts/search?q=mesophilic" title=" mesophilic"> mesophilic</a>, <a href="https://publications.waset.org/abstracts/search?q=biogas%20yield" title=" biogas yield"> biogas yield</a>, <a href="https://publications.waset.org/abstracts/search?q=pH" title=" pH"> pH</a> </p> <a href="https://publications.waset.org/abstracts/1923/improvement-anaerobic-digestion-performance-of-sewage-sludge-by-co-digestion-with-cattle-manure" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/1923.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">321</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1244</span> Upflow Anaerobic Sludge Blanket Reactor Followed by Dissolved Air Flotation Treating Municipal Sewage</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Priscila%20Ribeiro%20dos%20Santos">Priscila Ribeiro dos Santos</a>, <a href="https://publications.waset.org/abstracts/search?q=Luiz%20Antonio%20Daniel"> Luiz Antonio Daniel</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Inadequate access to clean water and sanitation has become one of the most widespread problems affecting people throughout the developing world, leading to an unceasing need for low-cost and sustainable wastewater treatment systems. The UASB technology has been widely employed as a suitable and economical option for the treatment of sewage in developing countries, which involves low initial investment, low energy requirements, low operation and maintenance costs, high loading capacity, short hydraulic retention times, long solids retention times and low sludge production. Whereas dissolved air flotation process is a good option for the post-treatment of anaerobic effluents, being capable of producing high quality effluents in terms of total suspended solids, chemical oxygen demand, phosphorus, and even pathogens. This work presents an evaluation and monitoring, over a period of 6 months, of one compact full-scale system with this configuration, UASB reactors followed by dissolved air flotation units (DAF), operating in Brazil. It was verified as a successful treatment system, and an issue of relevance since dissolved air flotation process treating UASB reactor effluents is not widely encompassed in the literature. The study covered the removal and behavior of several variables, such as turbidity, total suspend solids (TSS), chemical oxygen demand (COD), Escherichia coli, total coliforms and Clostridium perfringens. The physicochemical variables were analyzed according to the protocols established by the Standard Methods for Examination of Water and Wastewater. For microbiological variables, such as Escherichia coli and total coliforms, it was used the “pour plate” technique with Chromocult Coliform Agar (Merk Cat. No.1.10426) serving as the culture medium, while the microorganism Clostridium perfringens was analyzed through the filtering membrane technique, with the Ágar m-CP (Oxoid Ltda, England) serving as the culture medium. Approximately 74% of total COD was removed in the UASB reactor, and the complementary removal done during the flotation process resulted in 88% of COD removal from the raw sewage, thus the initial concentration of COD of 729 mg.L-1 decreased to 87 mg.L-1. Whereas, in terms of particulate COD, the overall removal efficiency for the whole system was about 94%, decreasing from 375 mg.L-1 in raw sewage to 29 mg.L-1 in final effluent. The UASB reactor removed on average 77% of the TSS from raw sewage. While the dissolved air flotation process did not work as expected, removing only 30% of TSS from the anaerobic effluent. The final effluent presented an average concentration of 38 mg.L-1 of TSS. The turbidity was significantly reduced, leading to an overall efficiency removal of 80% and a final turbidity of 28 NTU.The treated effluent still presented a high concentration of fecal pollution indicators (E. coli, total coliforms, and Clostridium perfringens), showing that the system did not present a good performance in removing pathogens. Clostridium perfringens was the organism which suffered the higher removal by the treatment system. The results can be considered satisfactory for the physicochemical variables, taking into account the simplicity of the system, besides that, it is necessary a post-treatment to improve the microbiological quality of the final effluent. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=dissolved%20air%20flotation" title="dissolved air flotation">dissolved air flotation</a>, <a href="https://publications.waset.org/abstracts/search?q=municipal%20sewage" title=" municipal sewage"> municipal sewage</a>, <a href="https://publications.waset.org/abstracts/search?q=UASB%20reactor" title=" UASB reactor"> UASB reactor</a>, <a href="https://publications.waset.org/abstracts/search?q=treatment" title=" treatment"> treatment</a> </p> <a href="https://publications.waset.org/abstracts/37925/upflow-anaerobic-sludge-blanket-reactor-followed-by-dissolved-air-flotation-treating-municipal-sewage" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/37925.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">337</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1243</span> Water Re-Use Optimization in a Sugar Platform Biorefinery Using Municipal Solid Waste</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Leo%20Paul%20Vaurs">Leo Paul Vaurs</a>, <a href="https://publications.waset.org/abstracts/search?q=Sonia%20Heaven"> Sonia Heaven</a>, <a href="https://publications.waset.org/abstracts/search?q=Charles%20Banks"> Charles Banks</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Municipal solid waste (MSW) is a virtually unlimited source of lignocellulosic material in the form of a waste paper/cardboard mixture which can be converted into fermentable sugars via cellulolytic enzyme hydrolysis in a biorefinery. The extraction of the lignocellulosic fraction and its preparation, however, are energy and water demanding processes. The waste water generated is a rich organic liquor with a high Chemical Oxygen Demand that can be partially cleaned while generating biogas in an Upflow Anaerobic Sludge Blanket bioreactor and be further re-used in the process. In this work, an experiment was designed to determine the critical contaminant concentrations in water affecting either anaerobic digestion or enzymatic hydrolysis by simulating multiple water re-circulations. It was found that re-using more than 16.5 times the same water could decrease the hydrolysis yield by up to 65 % and led to a complete granules desegregation. Due to the complexity of the water stream, the contaminant(s) responsible for the performance decrease could not be identified but it was suspected to be caused by sodium, potassium, lipid accumulation for the anaerobic digestion (AD) process and heavy metal build-up for enzymatic hydrolysis. The experimental data were incorporated into a Water Pinch technology based model that was used to optimize the water re-utilization in the modelled system to reduce fresh water requirement and wastewater generation while ensuring all processes performed at optimal level. Multiple scenarios were modelled in which sub-process requirements were evaluated in term of importance, operational costs and impact on the CAPEX. The best compromise between water usage, AD and enzymatic hydrolysis yield was determined for each assumed contaminant degradations by anaerobic granules. Results from the model will be used to build the first MSW based biorefinery in the USA. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=anaerobic%20digestion" title="anaerobic digestion">anaerobic digestion</a>, <a href="https://publications.waset.org/abstracts/search?q=enzymatic%20hydrolysis" title=" enzymatic hydrolysis"> enzymatic hydrolysis</a>, <a href="https://publications.waset.org/abstracts/search?q=municipal%20solid%20waste" title=" municipal solid waste"> municipal solid waste</a>, <a href="https://publications.waset.org/abstracts/search?q=water%20optimization" title=" water optimization"> water optimization</a> </p> <a href="https://publications.waset.org/abstracts/59926/water-re-use-optimization-in-a-sugar-platform-biorefinery-using-municipal-solid-waste" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/59926.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">324</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1242</span> Reactors with Effective Mixing as a Solutions for Micro-Biogas Plant</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=M.%20Zielinski">M. Zielinski</a>, <a href="https://publications.waset.org/abstracts/search?q=M.%20Debowski"> M. Debowski</a>, <a href="https://publications.waset.org/abstracts/search?q=P.%20Rusanowska"> P. Rusanowska</a>, <a href="https://publications.waset.org/abstracts/search?q=A.%20Glowacka-Gil"> A. Glowacka-Gil</a>, <a href="https://publications.waset.org/abstracts/search?q=M.%20Zielinska"> M. Zielinska</a>, <a href="https://publications.waset.org/abstracts/search?q=A.%20Cydzik-Kwiatkowska"> A. Cydzik-Kwiatkowska</a>, <a href="https://publications.waset.org/abstracts/search?q=J.%20Kazimierowicz"> J. Kazimierowicz</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Technologies for the micro-biogas plant with heating and mixing systems are presented as a part of the Research Coordination for a Low-Cost Biomethane Production at Small and Medium Scale Applications (Record Biomap). The main objective of the Record Biomap project is to build a network of operators and scientific institutions interested in cooperation and the development of promising technologies in the sector of small and medium-sized biogas plants. The activities carried out in the project will bridge the gap between research and market and reduce the time of implementation of new, efficient technological and technical solutions. Reactor with simultaneously mixing and heating system is a concrete tank with a rectangular cross-section. In the reactor, heating is integrated with the mixing of substrate and anaerobic sludge. This reactor is solution dedicated for substrates with high solids content, which cannot be introduced to the reactor with pumps, even with positive displacement pumps. Substrates are poured to the reactor and then with a screw pump, they are mixed with anaerobic sludge. The pumped sludge, flowing through the screw pump, is simultaneously heated by a heat exchanger. The level of the fermentation sludge inside the reactor chamber is above the bottom edge of the cover. Cover of the reactor is equipped with the screw pump driver. Inside the reactor, an electric motor is installed that is driving a screw pump. The heated sludge circulates in the digester. The post-fermented sludge is collected using a drain well. The inlet to the drain well is below the level of the sludge in the digester. The biogas is discharged from the reactor by the biogas intake valve located on the cover. The technology is very useful for fermentation of lignocellulosic biomass and substrates with high content of dry mass (organic wastes). The other technology is a reactor for micro-biogas plant with a pressure mixing system. The reactor has a form of plastic or concrete tank with a circular cross-section. The effective mixing of sludge is ensured by profiled at 90° bottom of the tank. Substrates for fermentation are supplied by an inlet well. The inlet well is equipped with a cover that eliminates odour release. The introduction of a new portion of substrates is preceded by pumping of digestate to the disposal well. Optionally, digestate can gravitationally flow to digestate storage tank. The obtained biogas is discharged into the separator. The valve supplies biogas to the blower. The blower presses the biogas from the fermentation chamber in such a way as to facilitate the introduction of a new portion of substrates. Biogas is discharged from the reactor by valve that enables biogas removal but prevents suction from outside the reactor. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=biogas" title="biogas">biogas</a>, <a href="https://publications.waset.org/abstracts/search?q=digestion" title=" digestion"> digestion</a>, <a href="https://publications.waset.org/abstracts/search?q=heating%20system" title=" heating system"> heating system</a>, <a href="https://publications.waset.org/abstracts/search?q=mixing%20system" title=" mixing system"> mixing system</a> </p> <a href="https://publications.waset.org/abstracts/97992/reactors-with-effective-mixing-as-a-solutions-for-micro-biogas-plant" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/97992.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">159</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1241</span> Performance of an Anaerobic Baffled Reactor (ABR) Treating High-Strength Food Industrial Wastewater with Fluctuating pH </h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=D.%20M.%20Bassuney">D. M. Bassuney</a>, <a href="https://publications.waset.org/abstracts/search?q=W.%20A.%20Ibrahim"> W. A. Ibrahim</a>, <a href="https://publications.waset.org/abstracts/search?q=Medhat%20A.%20E.%20Moustafa"> Medhat A. E. Moustafa</a> </p> <p class="card-text"><strong>Abstract:</strong></p> As awareness of the variable nature of food industrial wastewater and its environmental impact grows, a more stable treatment reactor is needed to treat such wastewater. In this paper, a performance of 5-compartment lab-scale Anaerobic Baffled Reactor (ABR) treating high strength wastewater with high pH variation was studied under three organic loading rates (OLRs). The reactor showed high COD removal efficiencies: 92.67, 97.44, and 98.19% corresponding to OLRs of 2.0, 3.0, and 4.8 KgCOD/m3 d, respectively. The first compartment showed a good buffering capacity and a distinct phase separation occurred in the ABR. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=anaerobic%20baffled%20reactor" title="anaerobic baffled reactor">anaerobic baffled reactor</a>, <a href="https://publications.waset.org/abstracts/search?q=food%20industrial%20wastewater" title=" food industrial wastewater"> food industrial wastewater</a>, <a href="https://publications.waset.org/abstracts/search?q=high%20strength%20wastewater" title=" high strength wastewater"> high strength wastewater</a>, <a href="https://publications.waset.org/abstracts/search?q=organic%20loading" title=" organic loading"> organic loading</a>, <a href="https://publications.waset.org/abstracts/search?q=pH" title=" pH"> pH</a> </p> <a href="https://publications.waset.org/abstracts/9695/performance-of-an-anaerobic-baffled-reactor-abr-treating-high-strength-food-industrial-wastewater-with-fluctuating-ph" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/9695.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">405</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1240</span> Developing Granular Sludge and Maintaining High Nitrite Accumulation for Anammox to Treat Municipal Wastewater High-efficiently in a Flexible Two-stage Process</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Zhihao%20Peng">Zhihao Peng</a>, <a href="https://publications.waset.org/abstracts/search?q=Qiong%20Zhang"> Qiong Zhang</a>, <a href="https://publications.waset.org/abstracts/search?q=Xiyao%20Li"> Xiyao Li</a>, <a href="https://publications.waset.org/abstracts/search?q=Yongzhen%20Peng"> Yongzhen Peng</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Nowadays, conventional nitrogen removal process (nitrification and denitrification) was adopted in most wastewater treatment plants, but many problems have occurred, such as: high aeration energy consumption, extra carbon sources dosage and high sludge treatment costs. The emergence of anammox has bring about the great revolution to the nitrogen removal technology, and only the ammonia and nitrite were required to remove nitrogen autotrophically, no demand for aeration and sludge treatment. However, there existed many challenges in anammox applications: difficulty of biomass retention, insufficiency of nitrite substrate, damage from complex organic etc. Much effort was put into the research in overcoming the above challenges, and the payment was rewarded. It was also imperative to establish an innovative process that can settle the above problems synchronously, after all any obstacle above mentioned can cause the collapse of anammox system. Therefore, in this study, a two-stage process was established that the sequencing batch reactor (SBR) and upflow anaerobic sludge blanket (UASB) were used in the pre-stage and post-stage, respectively. The domestic wastewater entered into the SBR first and went through anaerobic/aerobic/anoxic (An/O/A) mode, and the draining at the aerobic end of SBR was mixed with domestic wastewater, the mixture then entering to the UASB. In the long term, organic and nitrogen removal performance was evaluated. All along the operation, most COD was removed in pre-stage (COD removal efficiency > 64.1%), including some macromolecular organic matter, like: tryptophan, tyrosinase and fulvic acid, which could weaken the damage of organic matter to anammox. And the An/O/A operating mode of SBR was beneficial to the achievement and maintenance of partial nitrification (PN). Hence, sufficient and steady nitrite supply was another favorable condition to anammox enhancement. Besides, the flexible mixing ratio helped to gain a substrate ratio appropriate to anammox (1.32-1.46), which further enhance the anammox. Further, the UASB was used and gas recirculation strategy was adopted in the post-stage, aiming to achieve granulation by the selection pressure. As expected, the granules formed rapidly during 38 days, which increased from 153.3 to 354.3 μm. Based on bioactivity and gene measurement, the anammox metabolism and abundance level rose evidently, by 2.35 mgN/gVss·h and 5.3 x109. The anammox bacteria mainly distributed in the large granules (>1000 μm), while the biomass in the flocs (<200 μm) and microgranules (200-500 μm) barely displayed anammox bioactivity. Enhanced anammox promoted the advanced autotrophic nitrogen removal, which increased from 71.9% to 93.4%, even when the temperature was only 12.9 ℃. Therefore, it was feasible to enhance anammox in the multiple favorable conditions created, and the strategy extended the application of anammox to the full-scale mainstream, enhanced the understanding of anammox in the aspects of culturing conditions. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=anammox" title="anammox">anammox</a>, <a href="https://publications.waset.org/abstracts/search?q=granules" title=" granules"> granules</a>, <a href="https://publications.waset.org/abstracts/search?q=nitrite%20accumulation" title=" nitrite accumulation"> nitrite accumulation</a>, <a href="https://publications.waset.org/abstracts/search?q=nitrogen%20removal%20efficiency" title=" nitrogen removal efficiency"> nitrogen removal efficiency</a> </p> <a href="https://publications.waset.org/abstracts/185829/developing-granular-sludge-and-maintaining-high-nitrite-accumulation-for-anammox-to-treat-municipal-wastewater-high-efficiently-in-a-flexible-two-stage-process" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/185829.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">62</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1239</span> Quantification of Biomethane Potential from Anaerobic Digestion of Food Waste at Vaal University of Technology </h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Kgomotso%20Matobole">Kgomotso Matobole</a>, <a href="https://publications.waset.org/abstracts/search?q=Pascal%20Mwenge"> Pascal Mwenge</a>, <a href="https://publications.waset.org/abstracts/search?q=Tumisang%20Seodigeng"> Tumisang Seodigeng</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The global urbanisation and worldwide economic growth have caused a high rate of food waste generation, resulting in environmental pollution. Food waste disposed on landfills decomposes to produce methane (CH<sub>4</sub>), a greenhouse gas. Inadequate waste management practices contribute to food waste polluting the environment. Thus effective organic fraction of municipal solid waste (OFMSW) management and treatment are attracting widespread attention in many countries. This problem can be minimised by the employment of anaerobic digestion process, since food waste is rich in organic matter and highly biodegradable, resulting in energy generation and waste volume reduction. The current study investigated the Biomethane Potential (BMP) of the Vaal University of Technology canteen food waste using anaerobic digestion. Tests were performed on canteen food waste, as a substrate, with total solids (TS) of 22%, volatile solids (VS) of 21% and moisture content of 78%. The tests were performed in batch reactors, at a mesophilic temperature of 37 °C, with two different types of inoculum, primary and digested sludge. The resulting CH<sub>4</sub> yields for both food waste with digested sludge and primary sludge were equal, being 357 Nml/g VS. This indicated that food waste form this canteen is rich in organic and highly biodegradable. Hence it can be used as a substrate for the anaerobic digestion process. The food waste with digested sludge and primary sludge both fitted the first order kinetic model with k for primary sludge inoculated food waste being 0.278 day<sup>-1</sup> with R<sup>2</sup> of 0.98, whereas k for digested sludge inoculated food waste being 0.034 day<sup>-1</sup>, with R<sup>2</sup> of 0.847. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=anaerobic%20digestion" title="anaerobic digestion">anaerobic digestion</a>, <a href="https://publications.waset.org/abstracts/search?q=biogas" title=" biogas"> biogas</a>, <a href="https://publications.waset.org/abstracts/search?q=bio-methane%20potential" title=" bio-methane potential"> bio-methane potential</a>, <a href="https://publications.waset.org/abstracts/search?q=food%20waste" title=" food waste"> food waste</a> </p> <a href="https://publications.waset.org/abstracts/102298/quantification-of-biomethane-potential-from-anaerobic-digestion-of-food-waste-at-vaal-university-of-technology" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/102298.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">244</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1238</span> Developing a DNN Model for the Production of Biogas From a Hybrid BO-TPE System in an Anaerobic Wastewater Treatment Plant</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Hadjer%20Sadoune">Hadjer Sadoune</a>, <a href="https://publications.waset.org/abstracts/search?q=Liza%20Lamini"> Liza Lamini</a>, <a href="https://publications.waset.org/abstracts/search?q=Scherazade%20Krim"> Scherazade Krim</a>, <a href="https://publications.waset.org/abstracts/search?q=Amel%20Djouadi"> Amel Djouadi</a>, <a href="https://publications.waset.org/abstracts/search?q=Rachida%20Rihani"> Rachida Rihani</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Deep neural networks are highly regarded for their accuracy in predicting intricate fermentation processes. Their ability to learn from a large amount of datasets through artificial intelligence makes them particularly effective models. The primary obstacle in improving the performance of these models is to carefully choose the suitable hyperparameters, including the neural network architecture (number of hidden layers and hidden units), activation function, optimizer, learning rate, and other relevant factors. This study predicts biogas production from real wastewater treatment plant data using a sophisticated approach: hybrid Bayesian optimization with a tree-structured Parzen estimator (BO-TPE) for an optimised deep neural network (DNN) model. The plant utilizes an Upflow Anaerobic Sludge Blanket (UASB) digester that treats industrial wastewater from soft drinks and breweries. The digester has a working volume of 1574 m3 and a total volume of 1914 m3. Its internal diameter and height were 19 and 7.14 m, respectively. The data preprocessing was conducted with meticulous attention to preserving data quality while avoiding data reduction. Three normalization techniques were applied to the pre-processed data (MinMaxScaler, RobustScaler and StandardScaler) and compared with the Non-Normalized data. The RobustScaler approach has strong predictive ability for estimating the volume of biogas produced. The highest predicted biogas volume was 2236.105 Nm³/d, with coefficient of determination (R2), mean absolute error (MAE), and root mean square error (RMSE) values of 0.712, 164.610, and 223.429, respectively. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=anaerobic%20digestion" title="anaerobic digestion">anaerobic digestion</a>, <a href="https://publications.waset.org/abstracts/search?q=biogas%20production" title=" biogas production"> biogas production</a>, <a href="https://publications.waset.org/abstracts/search?q=deep%20neural%20network" title=" deep neural network"> deep neural network</a>, <a href="https://publications.waset.org/abstracts/search?q=hybrid%20bo-tpe" title=" hybrid bo-tpe"> hybrid bo-tpe</a>, <a href="https://publications.waset.org/abstracts/search?q=hyperparameters%20tuning" title=" hyperparameters tuning"> hyperparameters tuning</a> </p> <a href="https://publications.waset.org/abstracts/185307/developing-a-dnn-model-for-the-production-of-biogas-from-a-hybrid-bo-tpe-system-in-an-anaerobic-wastewater-treatment-plant" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/185307.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">45</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1237</span> Comparison of the Effects of Continuous Flow Microwave Pre-Treatment with Different Intensities on the Anaerobic Digestion of Sewage Sludge for Sustainable Energy Recovery from Sewage Treatment Plant</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=D.%20Hephzibah">D. Hephzibah</a>, <a href="https://publications.waset.org/abstracts/search?q=P.%20Kumaran"> P. Kumaran</a>, <a href="https://publications.waset.org/abstracts/search?q=N.%20M.%20Saifuddin"> N. M. Saifuddin</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Anaerobic digestion is a well-known technique for sustainable energy recovery from sewage sludge. However, sewage sludge digestion is restricted due to certain factors. Pre-treatment methods have been established in various publications as a promising technique to improve the digestibility of the sewage sludge and to enhance the biogas generated which can be used for energy recovery. In this study, continuous flow microwave (MW) pre-treatment with different intensities were compared by using 5 L semi-continuous digesters at a hydraulic retention time of 27 days. We focused on the effects of MW at different intensities on the sludge solubilization, sludge digestibility, and biogas production of the untreated and MW pre-treated sludge. The MW pre-treatment demonstrated an increase in the ratio of soluble chemical oxygen demand to total chemical oxygen demand (sCOD/tCOD) and volatile fatty acid (VFA) concentration. Besides that, the total volatile solid (TVS) removal efficiency and tCOD removal efficiency also increased during the digestion of the MW pre-treated sewage sludge compared to the untreated sewage sludge. Furthermore, the biogas yield also subsequently increases due to the pre-treatment effect. A higher MW power level and irradiation time generally enhanced the biogas generation which has potential for sustainable energy recovery from sewage treatment plant. However, the net energy balance tabulation shows that the MW pre-treatment leads to negative net energy production. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=anaerobic%20digestion" title="anaerobic digestion">anaerobic digestion</a>, <a href="https://publications.waset.org/abstracts/search?q=biogas" title=" biogas"> biogas</a>, <a href="https://publications.waset.org/abstracts/search?q=microwave%20pre-treatment" title=" microwave pre-treatment"> microwave pre-treatment</a>, <a href="https://publications.waset.org/abstracts/search?q=sewage%20sludge" title=" sewage sludge"> sewage sludge</a> </p> <a href="https://publications.waset.org/abstracts/34880/comparison-of-the-effects-of-continuous-flow-microwave-pre-treatment-with-different-intensities-on-the-anaerobic-digestion-of-sewage-sludge-for-sustainable-energy-recovery-from-sewage-treatment-plant" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/34880.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">326</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1236</span> Comparative Study on Hydrothermal Carbonization as Pre- and Post-treatment of Anaerobic Digestion of Dairy Sludge: Focus on Energy Recovery, Resources Transformation and Hydrochar Utilization</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Mahmood%20Al%20Ramahi">Mahmood Al Ramahi</a>, <a href="https://publications.waset.org/abstracts/search?q=G.%20Keszthelyi-Szabo"> G. Keszthelyi-Szabo</a>, <a href="https://publications.waset.org/abstracts/search?q=S.%20Beszedes"> S. Beszedes</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Hydrothermal carbonization (HTC) is a thermochemical reaction that utilizes saturated water and vapor pressure to convert waste biomass to C-rich products This work evaluated the effect of HTC as a pre- and post-treatment technique to anaerobic digestion (AD) of dairy sludge, as information in this field is still in its infancy, with many research and methodological gaps. HTC effect was evaluated based on energy recovery, nutrients transformation, and sludge biodegradability. The first treatment approach was executed by applying hydrothermal carbonization (HTC) under a range of temperatures, prior to mesophilic anaerobic digestion (AD) of dairy sludge. Results suggested an optimal pretreatment temperature at 210 °C for 30 min. HTC pretreatment increased methane yield and chemical oxygen demand removal. The theoretical model based on Boyle’s equation had a very close match with the experimental results. On the other hand, applying HTC subsequent to AD increased total energy production, as additional energy yield was obtained by the solid fuel (hydrochar) beside the produced biogas. Furthermore, hydrothermal carbonization of AD digestate generated liquid products (HTC digestate) with improved chemical characteristics suggesting their use as liquid fertilizers. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=hydrothermal%20carbonization" title="hydrothermal carbonization">hydrothermal carbonization</a>, <a href="https://publications.waset.org/abstracts/search?q=anaerobic%20digestion" title=" anaerobic digestion"> anaerobic digestion</a>, <a href="https://publications.waset.org/abstracts/search?q=energy%20balance" title=" energy balance"> energy balance</a>, <a href="https://publications.waset.org/abstracts/search?q=sludge%20biodegradability" title=" sludge biodegradability"> sludge biodegradability</a>, <a href="https://publications.waset.org/abstracts/search?q=biogas" title=" biogas"> biogas</a> </p> <a href="https://publications.waset.org/abstracts/129006/comparative-study-on-hydrothermal-carbonization-as-pre-and-post-treatment-of-anaerobic-digestion-of-dairy-sludge-focus-on-energy-recovery-resources-transformation-and-hydrochar-utilization" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/129006.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">189</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1235</span> The Effect of Magnetite Particle Size on Methane Production by Fresh and Degassed Anaerobic Sludge</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=E.%20Al-Essa">E. Al-Essa</a>, <a href="https://publications.waset.org/abstracts/search?q=R.%20Bello-Mendoza"> R. Bello-Mendoza</a>, <a href="https://publications.waset.org/abstracts/search?q=D.%20G.%20Wareham"> D. G. Wareham</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Anaerobic batch experiments were conducted to investigate the effect of magnetite-supplementation (7 mM) on methane production from digested sludge undergoing two different microbial growth phases, namely fresh sludge (exponential growth phase) and degassed sludge (endogenous decay phase). Three different particle sizes were assessed: small (50 - 150 nm), medium (168 – 490 nm) and large (800 nm - 4.5 µm) particles. Results show that, in the case of the fresh sludge, magnetite significantly enhanced the methane production rate (up to 32%) and reduced the lag phase (by 15% - 41%) as compared to the control, regardless of the particle size used. However, the cumulative methane produced at the end of the incubation was comparable in all treatment and control bottles. In the case of the degassed sludge, only the medium-sized magnetite particles increased significantly the methane production rate (12% higher) as compared to the control. Small and large particles had little effect on the methane production rate but did result in an extended lag phase which led to significantly lower cumulative methane production at the end of the incubation period. These results suggest that magnetite produces a clear and positive effect on methane production only when an active and balanced microbial community is present in the anaerobic digester. It is concluded that, (i) the effect of magnetite particle size on increasing the methane production rate and reducing lag phase duration is strongly influenced by the initial metabolic state of the microbial consortium, and (ii) the particle size would positively affect the methane production if it is provided within the nanometer size range. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=anaerobic%20digestion" title="anaerobic digestion">anaerobic digestion</a>, <a href="https://publications.waset.org/abstracts/search?q=iron%20oxide" title=" iron oxide"> iron oxide</a>, <a href="https://publications.waset.org/abstracts/search?q=methanogenesis" title=" methanogenesis"> methanogenesis</a>, <a href="https://publications.waset.org/abstracts/search?q=nanoparticle" title=" nanoparticle"> nanoparticle</a> </p> <a href="https://publications.waset.org/abstracts/109452/the-effect-of-magnetite-particle-size-on-methane-production-by-fresh-and-degassed-anaerobic-sludge" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/109452.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">144</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1234</span> Development and Performance of Aerobic Granular Sludge at Elevated Temperature</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Mustafa%20M.%20Bob">Mustafa M. Bob</a>, <a href="https://publications.waset.org/abstracts/search?q=Siti%20Izaidah%20Azmi"> Siti Izaidah Azmi</a>, <a href="https://publications.waset.org/abstracts/search?q=Mohd%20Hakim%20Ab%20Halim"> Mohd Hakim Ab Halim</a>, <a href="https://publications.waset.org/abstracts/search?q=Nur%20Syahida%20Abdul%20Jamal"> Nur Syahida Abdul Jamal</a>, <a href="https://publications.waset.org/abstracts/search?q=Aznah%20Nor-Anuar"> Aznah Nor-Anuar</a>, <a href="https://publications.waset.org/abstracts/search?q=Zaini%20Ujang"> Zaini Ujang</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In this research, the formation and development of aerobic granular sludge (AGS) for domestic wastewater treatment application in hot climate conditions was studied using a sequencing batch reactor (SBR). The performance of the developed AGS in the removal of organic matter and nutrients from wastewater was also investigated. The operation of the reactor was based on the sequencing batch system with a complete cycle time of 3 hours that included feeding, aeration, settling, discharging and idling. The reactor was seeded with sludge collected from the municipal wastewater treatment plant in Madinah city, Saudi Arabia and operated at a temperature of 40ºC using synthetic wastewater as influent. Results showed that granular sludge was developed after an operation period of 30 days. The developed granular sludge had a good settling ability with the average size of the granules ranging from 1.03 to 2.42 mm. The removal efficiency of chemical oxygen demand (COD), ammonia nitrogen (NH3-N) and total phosphorus (TP) were 87.31%, 91.93% and 61.25% respectively. These results show that AGS can be developed at elevated temperatures and it is a promising technique to treat domestic wastewater in hot and low humidity climate conditions such as those encountered in Saudi Arabia. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=aerobic%20granular%20sludge" title="aerobic granular sludge">aerobic granular sludge</a>, <a href="https://publications.waset.org/abstracts/search?q=hot%20climate" title=" hot climate"> hot climate</a>, <a href="https://publications.waset.org/abstracts/search?q=sequencing%20batch%20reactor" title=" sequencing batch reactor"> sequencing batch reactor</a>, <a href="https://publications.waset.org/abstracts/search?q=domestic%20wastewater%20treatment" title=" domestic wastewater treatment"> domestic wastewater treatment</a> </p> <a href="https://publications.waset.org/abstracts/15958/development-and-performance-of-aerobic-granular-sludge-at-elevated-temperature" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/15958.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">361</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1233</span> Plackett-Burman Design to Evaluate the Influence of Operating Parameters on Anaerobic Orthophosphate Release from Enhanced Biological Phosphorus Removal Sludge </h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Reza%20Salehi">Reza Salehi</a>, <a href="https://publications.waset.org/abstracts/search?q=Peter%20L.%20Dold"> Peter L. Dold</a>, <a href="https://publications.waset.org/abstracts/search?q=Yves%20Comeau"> Yves Comeau</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The aim of the present study was to investigate the effect of a total of 6 operating parameters including pH (X1), temperature (X2), stirring speed (X3), chemical oxygen demand (COD) (X4), volatile suspended solids (VSS) (X5) and time (X6) on anaerobic orthophosphate release from enhanced biological phosphorus removal (EBPR) sludge. An 8-run Plackett Burman design was applied and the statistical analysis of the experimental data was performed using Minitab16.2.4 software package. The Analysis of variance (ANOVA) results revealed that temperature, COD, VSS and time had a significant effect with p-values of less than 0.05 whereas pH and stirring speed were identified as non-significant parameters, but influenced orthophosphate release from the EBPR sludge. The mathematic expression obtained by the first-order multiple linear regression model between orthophosphate release from the EBPR sludge (Y) and the operating parameters (X1-X6) was Y=18.59+1.16X1-3.11X2-0.81X3+3.79X4+9.89X5+4.01X6. The model p-value and coefficient of determination (R2) value were 0.026 and of 99.87%, respectively, which indicates the model is significant and the predicted values of orthophosphate release from the EBPR sludge have been excellently correlated with the observed values. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=anaerobic" title="anaerobic">anaerobic</a>, <a href="https://publications.waset.org/abstracts/search?q=operating%20parameters" title=" operating parameters"> operating parameters</a>, <a href="https://publications.waset.org/abstracts/search?q=orthophosphate%20release" title=" orthophosphate release"> orthophosphate release</a>, <a href="https://publications.waset.org/abstracts/search?q=Plackett-Burman%20design" title=" Plackett-Burman design"> Plackett-Burman design</a> </p> <a 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