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Vol. 30 No. 3 (2018): Vol 30 Issue 3

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Complete Reduction of Hazardous Cr(VI) in Chromium Ore Processing Residue Dump Site

https://doi.org/10.14233/ajchem.2018.21060
Vanitha Murugaiyan
PG & Research Department of Chemistry, Government Arts College for Men (Autonomous), Nandanam, Chennai-600 035, India
T. Sehar
PG & Research Department of Chemistry, Government Arts College for Men (Autonomous), Nandanam, Chennai-600 035, India
S. Selvaraj
PG & Research Department of Chemistry, Government Arts College for Men (Autonomous), Nandanam, Chennai-600 035, India
P. Kamatchi Selvaraj
PG & Research Department of Chemistry, Government Arts College for Men (Autonomous), Nandanam, Chennai-600 035, India

Corresponding Author(s) : S. Selvaraj

pethkams64@gmail.com

Asian Journal of Chemistry, Vol. 30 No. 3 (2018): Vol 30 Issue 3

Abstract

This paper discusses the remediation of hexavalent chromium in the contaminated groundwater at laboratory scale. For simulated chromium water, different concentrations of sodium dithionite have been used to optimize the pH, dosage and time. Trials have been extended to chromium contaminated groundwater. The results are compared. An optimum condition for removal of hexavalent chromium is proposed. The treated groundwater is examined for various discharge standards of regulatory level. Reduction in concentration of hexavalent chromium, total chromium, chloride, sulphate, BOD, COD load and metals have been taken as the benchmark for efficacy of the process adopted. Direct application of sodium dithionite in this treatment indicates that the concentration of Cr(VI) can be successfully reduced to zero level concentration within 30 min, at pH 2.5 and its reduced form Cr(III) can be precipitated at pH 9. It is suggested to adopt, pump and treat method for restoration of groundwater.

Keywords

Contaminated groundwater Hexavalent chromium Total chromium Sodium dithionite Chromium ore
Murugaiyan, V., Sehar, T., Selvaraj, S., & Selvaraj, P. K. (2018). Complete Reduction of Hazardous Cr(VI) in Chromium Ore Processing Residue Dump Site. Asian Journal of Chemistry, 30(3), 620–624. https://doi.org/10.14233/ajchem.2018.21060
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