A Comparative Study on Conversion of Soluble Cr(VI) into Insoluble Cr(VI) and Reduction of Cr(VI) in Contaminated Groundwater at COPR Dump Site

Vanitha Murugaiyan1,*, S. Selvaraj2 and P. Kamatchi Selvaraj2

1Tamilnadu Pollution Control Board, Guindy, Chennai-600032, India

2PG & Research Department of Chemistry, Government Arts College for Men (Autonomous), Nandanam, Chennai-600035, India

*Corresponding author: E-mail: vanithapcb@gmail.com

Abstract

The most common methodology for removal of Cr(VI) in literatures is the combination of reduction and precipitation process. The disadvantages of this method are presence of high total dissolved solids in the treated water and sludge generation. In order to find a new solution, efforts have been focussed to convert Cr(VI) present in the groundwater, into the useful products like zinc chromate and barium chromate under appropriate conditions. The efficiency of these conversions is compared with the efficiency of the reduction and precipitation process adopted in this study, using sodium metabisulphite. These experimental studies were carried out with stimulated water containing 2000 mg/L of Cr(VI) and then extended to Cr(VI) contaminated groundwater with same concentration. The results are compared and validated through batch experiments.

Keywords

Contaminated groundwater, Hexavalent chromium, Total chromium, Zinc chromate, Barium chromate.

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