Hybrid Technology of Bioleaching and Electrokinetics to Remediate Chromium Contaminated Sediments
Sediment pollution is quite a serious problem in the whole world.Hybrid technology of bioleaching and electroki-netics was adopted to remediate the polluted sediments.The speciation of chromium in sediments had significant changes dur-ing bioleaching remediation.The exchangeable and carbonate-bound portion were increased significantly,whereas Fe/Mn oxide-bound,organic matter/sulfide-bound or residual fraction were decreased significantly(It can provide favorable condi-tions for the migration of chromium during electrokinetics remediation).The remove rate of chromium was 32.6％by electro-kinetic remediation method.The leaching rate of chromium in sediment was 25.1％,which was closely related to pH value and redox potential of sediments.In the comparison of bioleaching-electrokinetic and electrokinetic remediation,the average removal rate of total chromium was up to 53.4％after bioleaching-electrokinetic remediation.Experiments show that the hybrid technology of bioleaching and electrokinetic remediation has synergistic effects and is suitable for chromium pollution control in sediments.
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