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《Environmental Science & Technology》 2010-02
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Examining Changes of Physico-chemical Characteristics of Contaminated Sediment after Electrokinetic Remediation

LI Tai-ping,YUAN Song-hu,LIN Li,WAN Jin-zhong,XU Yi,LU Xiao-hua (Environmental Science Research Institute,Huazhong University of Science and Technology,Wuhan,430074,China)  
This paper presents a bench-scale electrokinetic setup used for lab examining of contaminated sediment remediation with respect to changes of pH value,organic content,redox potential,moisture and electrical conductivity of the sediments.Sediment,sampled from a chemical plant's effluent ditch,polluted mainly by hexachlorobenzene,was added with the nonionic surfactant OP-10 as an enhanced reagent.After the electro-kinetic remediation,it was found that the sediment was acidified adjacent to the anode and basified adjacent to the cathode.The organic content increased more than 46% close to the anode,compared with the initial level,due to adsorption of the surfactant onto the sediment,but decreased close to the cathode due to the organic matter's migration with the electro-osmotic flow.Distribution of redox potential tended to a pattern in reverse of that of pH,moisture of the sediment tended to increase from the anode to cathode but declined near the cathode.In general,electrical conductivity of the sediment tended to decrease after the remediation of sediment.
【Fund】: 国家自然科学基金项目(20777024);; 华中科技大学自然科学基金项目
【CateGory Index】: X53
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