Abstract
AbstractLaboratory and field investigations were performed in this study to evaluate the efficacy of a fine-grained clayey soil as a low-cost primary liner material for attenuating chrome-laden leachate from a chrome sludge disposal site of a tannery plant. On-site soil and water samples exhibited the existence of Cr6+ in excess of the permissible limit as prescribed for discharging inland surface water. Batch adsorption kinetic results showed that Cr6+ removal in equilibration increases with elevation of temperature. The soil mass in use exhibited reasonable capability of adsorbing Cr6+, and the kinetic results demonstrated that the pseudo second-order kinetic model fitted reasonably well. The triaxial test results revealed a maximum permissible overburden pressure of 3.0 kN/m2 from deposited waste if the clayey soil is to be used as a liner material. The use of a compacted clay soil with a thickness of 600 mm is recommended for effective containment of leachate transmission with regard to a leachable h...
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