Effect of Electrokinetic on Biodegradation of Benzo a pyrene in a Clay Soil with Polarity Reversal

摘要

Electro-bioremediation is an innovative technology for the cleanup of organic-contaminated soil. This study attempted to test the feasibility of electrokinetic process for the bioremediation of soil contaminated with benzo[a]pyrene (Bap) as a model polycyclic aromatic hydrocarbon (PAH) at laboratory scale. The electric field caused great change in soil pH and moisture content near the anode;while using electrode polarity reversal, pH and moisture content could be finely controlled. Over 40% of the initial 50 mg/kg Bap in clay soil could be removed under electric field with electrode polarity reversal in 40 d, around 88% higher than that with bacteria treatment only. The electrokinetic stimulated the bacteria growth and accelerated the decontamination efficiency of Bap. Hence, the present study provided a promising electrokinetic technology for bioremediation of PAH contaminated soils.