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Electrokinetic remediation is an efficient and environmental friendly in-situ remediation technology for fine-grained soil or sludge. However, the problem of focusing phenomena caused by the pH values of sludge which controlled by the pH values of catholyte and polarization caused by the pH values of catholyte during electrokinetic process reduce the removal efficiency of heavy metals. In this work, an electrochemical method was designed, which was safety and environmental friendly to control the pH values of catholyte. The results of two experiments carried out five days under the constant voltage of 32V have shown that the removal rate of heavy metals of Cu, Ni, Pb, Cr and Zn in sludge is 15.63%, 15.65%, 9.35%, 42.86%, 8.35% when catholyte pH values controlled which is much better than pH uncontrolled 11.37%, 4.91%, 1.45%, 0%, 0% respectively. It was proved that focusing phenomena and polarization during electrokinetic process could be controlled.

Electrokinetic remediation for smelting sludge containing heavy metals: a novel method on pH control of catholyte