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Title: Hexavalent chromium reduction from real electroplating wastewater by chemical precipitation
Authors: Verma B.
Balomajumder, Chandrajit
Published in: Bulletin of the Chemical Society of Ethiopia
Abstract: The immense use of chromium in the electroplating process leads to the discharge of hexavalent chromium in its effluent. Since Cr(VI) is highly toxic, its exposure poses an acute risk of health. On the contrary, Cr(III) which is naturally occurring, is much less toxic than Cr(VI). Therefore the easiest way to deal with Cr(VI) is to reduce it into its trivalent form. Exhaustive chemical analysis was done to reduce Cr(VI) to Cr(III) by using sodium metabisulfite (Na2S2O5) and ferrous sulfate (FeSO4). And after the reduction process, precipitating agents such as (Ca(OH)2), (NaOH) and a combination of the two were used to precipitate Cr(III) as hydroxides. Various parameters were varied and optimized. It was observed that the % Cr(VI) reduction increased from 88% to 99.97% when the dosage of sodium metabisulfite increased from 40 mg/L to 100 mg/L at a pH of 2. The maximum removal of 98.2% was achieved by using the combination of Ca(OH)2 + NaOH at a pH of 9.
Citation: Bulletin of the Chemical Society of Ethiopia(2020), 34(1): 67-74
Issue Date: 2020
Publisher: Chemical Society of Ethiopia
Keywords: Chemical precipitation
Heavy metal
Hexavalent chromium
Wastewater treatment
ISSN: 10113924
Author Scopus IDs: 57191976974
Author Affiliations: Verma, B., Department of Chemical Engineering, IIT Roorkee, Roorkee, 247667, India
Balomajumder, C., Department of Chemical Engineering, IIT Roorkee, Roorkee, 247667, India
Funding Details: .Ministry of Education and Human Resources Development,¬†MOEHRD.The authors are grateful to the Department of Chemical Engineering, Indian Institute of Technology Roorkee, India for providing a platform to conduct the series of experiments and analyze the various results. Also, a special thanks to the Ministry of Huma
Corresponding Author: Verma, B.; Department of Chemical Engineering, India; email:
Appears in Collections:Journal Publications [CH]

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