Abstract
This paper presents a systematic bench-scale study on removals of Chromium (Cr) and Cadmium (Cd) from abandoned industrial site in China with concentration of 510mg/kg for Cr and 200mg/kg for Cd. The polarity exchange and conventional electrokinetic remediation were conducted with treatment time of 192h to assess the removal efficiency and transient behavior of Cr and Cd. All the experiments were subjected to a voltage gradient of 1V/cm. Results showed that, polarity exchange electrokinetic remediation led to 88% of Cr and 94% of Cd removals when exchange polarity interval was 48h. Seventy percent of Cr and 82% of Cd were removed when exchange polarity interval was 96h. The removal efficiency was comparable with conventional electrokinetic remediation with removals of 57% of Cr and 49% of Cd. Soil pH was controlled between 5 and 7 by polarity exchange electrokinetic remediation. Additional chemicals and complex equipment were not required.
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