Abstract
An investigation in field scale was carried out in a common tannery effluent treatment plant site near Kolkata for evaluating hexavalent chromium migration through the fine-grained clayey soil, for disposal of chrome sludge emanated from cake filter press. The locally available soil was used in situ as a compacted clay liner material as adsorbing candidate. Laboratory batch adsorption results demonstrated about 70–80 % of hexavalent chromium removed after 120 min of equilibration time. Hydraulic conductivity of the soil was found to be decreased by two decimal place due to permeation of hexavalent chromium laden leachate. Field test results also exhibited 63 % of hexavalent chromium was sorbed after 120 days interval. Experimental results were also validated by mathematical analysis with good agreement to test data.
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