title: Comparison of electrokinetic soil remediation methods using one fixed anode and approaching anodes.
abstract: 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 speed-up 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.
authors: School of Environmental Science and Engineering, Shanghai Jiao Tong University, 800 # Dongchuan Road, Shanghai 200240, PR China. zmshen@sjtu.edu.cn
authors: Zhemin
authors: Z
authors: Shen
authors: Xuejun
authors: X
authors: Chen
authors: Jinping
authors: J
authors: Jia
authors: Liya
authors: L
authors: Qu
authors: Wenhua
authors: W
authors: Wang
mesh_terms: D002104:Cadmium; D004553:Electric Conductivity; D004563:Electrochemistry / Q000295:instrumentation / Q000379:methods; D004566:Electrodes; D052918:Environmental Restoration and Remediation / Q000295:instrumentation / Q000379:methods*; D006863:Hydrogen-Ion Concentration; D010084:Oxidation-Reduction; D012989:Soil Pollutants
chemical_list: D012989:Soil Pollutants; D002104:Cadmium