Search results for: Wookeun Bae

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id="custom-search-input"> <div class="input-group"> <i class="fas fa-search"></i> <input type="text" class="search-query" name="q" placeholder="Author, Title, Abstract, Keywords" value="Wookeun Bae"> <input type="submit" class="btn_search" value="Search"> </div> </div> </form> </div> </div> <div class="row mt-3"> <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> 5</div> </div> </div> </div> <h1 class="mt-3 mb-3 text-center" style="font-size:1.6rem;">Search results for: Wookeun Bae</h1> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">5</span> Optimizing the Elevated Nitritation for Autotrophic/Heterotrophic Denitritation in CSTR by Treating STP Wastewater</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Hammad%20Khan">Hammad Khan</a>, <a href="https://publications.waset.org/abstracts/search?q=Wookeun%20Bae"> Wookeun Bae </a> </p> <p class="card-text"><strong>Abstract:</strong></p> The objective of this study was to optimize and control the highly loaded and efficient nitrite production having suitability for autotrophic and heterotrophic denitritation. A lab scale CSTR for partial and full nitritation was operated to treat the livestock manure digester liquor having an ammonium concentration of ~600 mg-NH4+-N/L and biodegradable contents of ~0.35 g-COD/L. The experiments were performed at 30掳C, pH: 8.0, DO: 1.5 mg/L and SRT ranging from 7-20 days. After 125 days operation, >95% nitrite buildup having the ammonium loading rate of ~3.2 kg-NH4+-N/m3-day was seen with almost complete ammonium conversion. On increasing the loading rate further (i-e, from 3.2-6.2 kg-NH4+-N/m3-day), stability of the system remained unaffected. On decreasing the pH from 8 to 7.5 and further 7.2, removal rate can be easily controlled as 95%, 75%, and even 50%. Results demonstrated that nitritation stability and desired removal rates are controlled by a balance of simultaneous inhibition by FA & FNA, pH effect and DO limitation. These parameters proved to be effective even to produce an appropriate influent for anammox. In addition, a mathematical model, identified through the occurring biological reactions, is proposed to optimize the full and partial nitritation process. The proposed model present relationship between pH, ammonium and produced nitrite for full and partial nitritation under the varying concentrations of DO, and simultaneous inhibition by FA and FNA. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=stable%20nitritation" title="stable nitritation">stable nitritation</a>, <a href="https://publications.waset.org/abstracts/search?q=high%20loading" title=" high loading"> high loading</a>, <a href="https://publications.waset.org/abstracts/search?q=autrophic%20denitritation" title=" autrophic denitritation"> autrophic denitritation</a>, <a href="https://publications.waset.org/abstracts/search?q=hetrotrophic%20denitritation" title=" hetrotrophic denitritation"> hetrotrophic denitritation</a> </p> <a href="https://publications.waset.org/abstracts/13980/optimizing-the-elevated-nitritation-for-autotrophicheterotrophic-denitritation-in-cstr-by-treating-stp-wastewater" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/13980.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">312</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">4</span> Achieving the Elevated Nitritation for Autotrophic/Heterotrophic Denitritation in CSTR by Treating STP Wastewater</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Hammad%20Khan">Hammad Khan</a>, <a href="https://publications.waset.org/abstracts/search?q=Wookeun%20Bae"> Wookeun Bae </a> </p> <p class="card-text"><strong>Abstract:</strong></p> The objective of this study was to optimize, achieve and control the highly loaded and efficient nitrite production having suitability for autotrophic and heterotrophic denitritation. A lab scale CSTR for partial and full nitritation was operated to treat the livestock manure digester liquor having an ammonium concentration of ~600 mg-NH4+-N/L and biodegradable contents of ~0.35 g-COD/L. The experiments were performed at 30掳C, pH: 8.0, DO: 1.5 mg/L and SRT ranging from 7-20 days. After 125 days operation, >95% nitrite buildup having the ammonium loading rate of ~3.2 kg-NH4+-N/m3-day was seen with almost complete ammonium conversion. On increasing the loading rate further (i-e, from 3.2-6.2 kg-NH4+-N/m3-day), stability of the system remained unaffected. On decreasing the pH from 8 to7.5 and further 7.2, removal rate can be easily controlled as 95%, 75%, and even 50%. Results demonstrated that nitritation stability and desired removal rates are controlled by a balance of simultaneous inhibition by FA & FNA, pH affect and DO limitation. These parameters proved to be effective even to produce an appropriate influent for anammox. In addition, a mathematical model, identified through the occurring biological reactions, is proposed to optimize the full and partial nitritation process. The proposed model present relationship between pH, ammonium and produced nitrite for full and partial nitritation under the varying concentrations of DO, and simultaneous inhibition by FA and FNA. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=stable%20nitritation" title="stable nitritation">stable nitritation</a>, <a href="https://publications.waset.org/abstracts/search?q=high%20loading" title=" high loading"> high loading</a>, <a href="https://publications.waset.org/abstracts/search?q=autrophic%20denitritation" title=" autrophic denitritation"> autrophic denitritation</a>, <a href="https://publications.waset.org/abstracts/search?q=CSTR" title=" CSTR"> CSTR</a> </p> <a href="https://publications.waset.org/abstracts/13981/achieving-the-elevated-nitritation-for-autotrophicheterotrophic-denitritation-in-cstr-by-treating-stp-wastewater" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/13981.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">240</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">3</span> Optimizing the Elevated Nitritation for Autotrophic/Heterotrophic Denitritation in CSTR by Treating Livestock Wastewater</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Hammad%20Khan">Hammad Khan</a>, <a href="https://publications.waset.org/abstracts/search?q=Wookeun%20Bae"> Wookeun Bae</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The objective of this study was to optimize and control the highly loaded and efficient nitrite production having suitability for autotrophic and heterotrophic denitritation. A lab scale CSTR for partial and full nitritation was operated to treat the livestock manure digester liquor having an ammonium concentration of ~2000 mg-NH4+-N/L and biodegradable contents of ~0.8 g-COD/L. The experiments were performed at 30掳C, pH: 8.0 DO: 1.5 mg/L and SRT ranging from 7-20 days. After 125 days operation, >95% nitrite buildup having the ammonium loading rate of ~3.2 kg-NH4+-N/m3-day was seen with almost complete ammonium conversion. On increasing the loading rate further (i.e. from 3.2-6.2 kg-NH4+-N/m3-day), stability of the system remained unaffected. On decreasing the pH from 8 to7.5 and further 7.2, removal rate can be easily controlled as 95%, 75% and even 50%. Results demonstrated that nitritation stability and desired removal rates are controlled by a balance of simultaneous inhibition by FA and FNA, pH affect and DO limitation. These parameters proved to be effective even to produce an appropriate influent for anammox. In addition, a mathematical model, identified through the occurring biological reactions, is proposed to optimize the full and partial nitritation process. The proposed model presents relationship between pH, ammonium and produced nitrite for full and partial nitritation under the varying concentrations of DO, and simultaneous inhibition by FA and FNA. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=stable%20nitritation" title="stable nitritation">stable nitritation</a>, <a href="https://publications.waset.org/abstracts/search?q=high%20loading" title=" high loading"> high loading</a>, <a href="https://publications.waset.org/abstracts/search?q=autrophic%20denitritation" title=" autrophic denitritation"> autrophic denitritation</a>, <a href="https://publications.waset.org/abstracts/search?q=hetrotrophic%20denitritation" title=" hetrotrophic denitritation"> hetrotrophic denitritation</a> </p> <a href="https://publications.waset.org/abstracts/13978/optimizing-the-elevated-nitritation-for-autotrophicheterotrophic-denitritation-in-cstr-by-treating-livestock-wastewater" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/13978.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">327</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">2</span> Achieving the Elevated Nitritation for Autotrophic/Heterotrophic Denitritation in CSTR by Treating Livestock Wastewater</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Hammad%20Khan">Hammad Khan</a>, <a href="https://publications.waset.org/abstracts/search?q=Wookeun%20Bae"> Wookeun Bae </a> </p> <p class="card-text"><strong>Abstract:</strong></p> The objective of this study was to achieve, optimize and control the highly loaded and efficient nitrite production having suitability for autotrophic and heterotrophic denitritation. A lab scale CSTR for partial and full nitritation was operated to treat the livestock manure digester liquor having an ammonium concentration of ~2000 mg-NH4+-N/L and biodegradable contents of ~0.8 g-COD/L. The experiments were performed at 30掳C, pH: 8.0, DO: 1.5 mg/L and SRT ranging from 7-20 days. After 125 days operation, >95% nitrite buildup having the ammonium loading rate of ~3.2 kg-NH4+-N/m3-day was seen with almost complete ammonium conversion. On increasing the loading rate further (i-e, from 3.2-6.2 kg-NH4+-N/m3-day), stability of the system remained unaffected. On decreasing the pH from 8 to 7.5 and further 7.2, removal rate can be easily controlled as 95%, 75% and even 50%. Results demonstrated that nitritation stability and desired removal rates are controlled by a balance of simultaneous inhibition by FA & FNA, pH affect and DO limitation. These parameters proved to be effective even to produce an appropriate influent for anammox. In addition, a mathematical model, identified through the occurring biological reactions, is proposed to optimize the full and partial nitritation process. The proposed model present relationship between pH, ammonium and produced nitrite for full and partial nitritation under the varying concentrations of DO, and simultaneous inhibition by FA and FNA. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=stable%20nitritation" title="stable nitritation">stable nitritation</a>, <a href="https://publications.waset.org/abstracts/search?q=high%20loading" title=" high loading"> high loading</a>, <a href="https://publications.waset.org/abstracts/search?q=autrophic%20denitritation" title=" autrophic denitritation"> autrophic denitritation</a>, <a href="https://publications.waset.org/abstracts/search?q=hetrotrophic%20denitritation" title=" hetrotrophic denitritation"> hetrotrophic denitritation</a> </p> <a href="https://publications.waset.org/abstracts/13982/achieving-the-elevated-nitritation-for-autotrophicheterotrophic-denitritation-in-cstr-by-treating-livestock-wastewater" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/13982.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">274</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">1</span> Rapid Start-Up and Efficient Long-Term Nitritation of Low Strength Ammonium Wastewater with a Sequencing Batch Reactor Containing Immobilized Cells</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Hammad%20Khan">Hammad Khan</a>, <a href="https://publications.waset.org/abstracts/search?q=Wookeun%20Bae"> Wookeun Bae </a> </p> <p class="card-text"><strong>Abstract:</strong></p> Major concerns regarding nitritation of low-strength ammonium wastewaters include low ammonium loading rates (usually below 0.2 kg/m3-d) and uncertainty about long-term stability of the process. The purpose of this study was to test a sequencing batch reactor (SBR) filled with cell-immobilized polyethylene glycol (PEG) pellets to see if it could achieve efficient and stable nitritation under various environmental conditions. SBR was fed with synthetic ammonium wastewater of 30卤2 mg-N/L and pH: 8卤0.05, maintaining the dissolved oxygen concentration of 1.7卤0.2 mg/L and the temperature at 30卤1oC. The reaction was easily converted to partial nitrification mode within a month by feeding relatively high ammonium substrate (~100 mg-N/L) in the beginning. We observed stable nitritation over 300 days with high ammonium loading rates (as high as ~1.1 kg-N/m3-d), nitrite accumulation rates (mostly over 97%) and ammonium removal rate (mostly over 95%). DO was a major limiting substrate when the DO concentration was below ~4 mg/L and the NH4+-N concentration was above 5 mg/L, giving almost linear increase in the ammonium oxidation rate with the bulk DO increase. Low temperatures mainly affected the reaction rate, which could be compensated for by increasing the pellet volume (i.e. biomass). Our results demonstrated that an SBR filled with small cell-immobilized PEG pellets could achieve very efficient and stable nitritation of a low-strength ammonium wastewater. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=ammonium%20loading%20rate%20%28ALR%29" title="ammonium loading rate (ALR)">ammonium loading rate (ALR)</a>, <a href="https://publications.waset.org/abstracts/search?q=cell-immobilization" title=" cell-immobilization"> cell-immobilization</a>, <a href="https://publications.waset.org/abstracts/search?q=long-term%20nitritation" title=" long-term nitritation"> long-term nitritation</a>, <a href="https://publications.waset.org/abstracts/search?q=sequencing%20batch%20reactor%20%28SBR%29" title=" sequencing batch reactor (SBR)"> sequencing batch reactor (SBR)</a>, <a href="https://publications.waset.org/abstracts/search?q=sewage%20treatment" title=" sewage treatment"> sewage treatment</a> </p> <a href="https://publications.waset.org/abstracts/14015/rapid-start-up-and-efficient-long-term-nitritation-of-low-strength-ammonium-wastewater-with-a-sequencing-batch-reactor-containing-immobilized-cells" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/14015.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">273</span> </span> </div> </div> </div> </main> <footer> <div id="infolinks" class="pt-3 pb-2"> <div class="container"> <div style="background-color:#f5f5f5;" class="p-3"> <div class="row"> <div class="col-md-2"> <ul class="list-unstyled"> About <li><a href="https://waset.org/page/support">About Us</a></li> <li><a href="https://waset.org/page/support#legal-information">Legal</a></li> <li><a target="_blank" rel="nofollow" href="https://publications.waset.org/static/files/WASET-16th-foundational-anniversary.pdf">WASET celebrates 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Search results for: Wookeun Bae