Comparison of electrokinetic soil remediation methods using one fixed anode and approaching anodes

被引:89
作者
Shen, Zhemin [1 ]
Chen, Xuejun [1 ]
Jia, Jinping [1 ]
Qu, Liya [2 ]
Wang, Wenhua [1 ]
机构
[1] Shanghai Jiao Tong Univ, Sch Environm Sci & Engn, Shanghai 200240, Peoples R China
[2] Guizhou Res & Designing Inst Environm Sci, Guiyang 550002, Guizhou, Peoples R China
基金
中国国家自然科学基金;
关键词
soil pollution; electrode; electrokinetic remediation; cation exchange membrane;
D O I
10.1016/j.envpol.2007.02.004
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
During the cation exchange membrane (CEM) enhanced electrokinetic (EK) soil remediation, the nearer to the anode, the higher are the H+ concentrations and the redox potentials. As both low pH and high redox potential are helpful to speedup Cd electro-migration, soils near the anode can be quickly remedied. Usually EK process is operated with one fixed anode (FA). A novel CEM enhanced EK method with approaching anodes (AAs) is proposed to accelerate electro-migration effect. Several mesh Ti/Ru anodes were inserted as AAs in the treated soil. They were switched in turn from the anode towards the cathode. Thus high H+ ions concentrations and high redox potentials quickly migrate to the cathode. Consequently, soil remediation is accelerated and nearly 44% of energy and 40% of time can be saved. The mechanism of Cd electro-migration behavior in soils during CEM enhanced EK is described as the elution in an electrokinetically driven chromatogram. (C) 2007 Elsevier Ltd. All rights reserved.
引用
收藏
页码:193 / 199
页数:7
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