ASSESSMENT AND REMEDIATION OF HEXAVALENT CHROMIUM CONTAMINATED SITE – A CASE STUDY

The environmental contamination of hexavalent chromium (Cr6+) has emerged as a major area of concern in the recent years. Cr6+ is one of the highly toxic carcinogenic substances and is released to environmnt through a number of industrial operations which process or use ores and various comounds of chromium. The wastes and residues generated from such industries (e.g., sludge, fly ash, slag, etc.) contain significant concentrations of Cr6+, and were used in the past as a fill material at numerous locations (Salunkhe et al., 1998). The Cr6+, being highly soluble in water, has been leaching from many such sites and seepage of leachate through subsurface in to the groundwater has posed a considerable health hazard in the vicinity of such sites.

The present study deals with assessment and remediation of a site contaminated with chromite ore processing residue (COPR). Based on detailed characterization of COPR dumps, leachtate generated from the site and monitoring of groundwater in the area, it was estimated that an area of about 1.5 km2 in the south–southeast direction from the site is contaminated in terms of hexavalent chromium. Based on detailed evaluation of various remedial options, and preliminary bench scale studies, the containment of source with soilbentonite slurry walls along with bioremediation of COPR dump site and bioremediation of contaminated groundwater was recommended for implementation.

Copyright:	© IWWG International Waste Working Group
Source:	Specialized Session D (Oktober 2007)
Pages:	9
Price inc. VAT:	€ 9,00
Autor:	Mahendra P Patil Dr. Tapan Chakrabarti S.D. Deshpande S. Mankar

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