{"title":"Decontamination of Cr(VI) Polluted Wastewater by use of Low Cost Industrial Wastes","authors":"Marius Gheju, Rodica Pode","volume":54,"journal":"International Journal of Environmental and Ecological Engineering","pagesStart":343,"pagesEnd":349,"ISSN":"1307-6892","URL":"https:\/\/publications.waset.org\/pdf\/3214","abstract":"The reduction of hexavalent chromium by scrap iron\r\nwas investigated in continuous system, using long-term column\r\nexperiments, for aqueous Cr(VI) solutions having low buffering\r\ncapacities, over the Cr(VI) concentration range of 5 \u2013 40 mg\/L. The\r\nresults showed that the initial Cr(VI) concentration significantly\r\naffects the reduction capacity of scrap iron. Maximum reduction\r\ncapacity of scrap iron was observed at the beginning of the column\r\nexperiments; the lower the Cr(VI) concentration, the greater the\r\nexperiment duration with maximum scrap iron reduction capacity.\r\nHowever, due to passivation of active surface, scrap iron reduction\r\ncapacity continuously decreased in time, especially after Cr(VI)\r\nbreakthrough. The experimental results showed that highest\r\nreduction capacity recorded until Cr(VI) breakthrough was 22.8 mg\r\nCr(VI)\/g scrap iron, at CI = 5 mg\/L, and decreased with increasing\r\nCr(VI) concentration. In order to assure total reduction of greater\r\nCr(VI) concentrations for a longer period of time, either the mass of\r\nscrap iron filling, or the hydraulic retention time should be increased.","references":"[1] J. Barnhart, \"Occurrences, uses and properties of chromium,\" Regul.\r\nToxicol. Pharmacol., vol. 26, 1997, pp. s3-s7.\r\n[2] D. E. Kimbrough, Y. Cohen, and A. M. 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