Comparative experiments on electro-osmotic treatment effect of polluted soil using EKG and iron electrodes  

EKG和铁电极加固修复污染土对比研究（英文）

作　　者：ZANG Jun-chao ZHENG Ling-wei XIE Xin-yu WANG Heng-yu LIU Yi-min PANG Jie 臧俊超;郑凌逶;谢新宇;王恒宇;刘亦民;庞杰(Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University;Ningbo Institute of Technology, Zhejiang University)

机构地区：[1]Research Center of Coastal and Urban Geotechnical Engineering,Zhejiang University,Hangzhou310058,China [2]Ningbo Institute of Technology,Zhejiang University,Ningbo315100,China

出　　处：《Journal of Central South University》2018年第12期3052-3061,共10页中南大学学报（英文版）

基　　金：Project(51378469)supported by the National Natural Science Foundation of China;Project(2017C33034)supported by the Application Research of Public Welfare Technology in Zhejiang Province,China;Project(LQ18E080001)supported by the Zhejiang Provincial Natural Science Foundation,China;Project(12017A610304)supported by the Natural Science Foundation of Ningbo City,China

摘　　要：This study presents a comprehensive comparison of the electro-osmosis treatments of heavy metal contaminated soil using electrokinetic geosynthetics(EKG)and iron electrodes in terms of both theoretical analysis and experimental research.The variation in the electrical parameters was analyzed,and the results show linear relationships between temperature and conductivity and between the soil and pore water conductivities.The average cathode contact resistance of iron is60%smaller than that of EKG,whereas the average anode contact resistance of EKG is56%smaller than that of iron.The values of the power consumption per unit mass of contaminants for EKG and iron are1.895and1.989kJ/g,respectively.After electro-osmosis,the number of soil pores increased,but the average area decreased,with an average area of0.9100–1.0504μm^2.Based on microstructure analysis,we obtained higher electroosmotic efficiency and realized the effective analysis and utilization between macroscopic and microscopic parameters.本文从理论分析和实验研究两方面综合比较了EKG(Electrokinetic Geosynthetics)电极和铁电极对重金属污染土壤的电渗处理效果。采用电学参数评价加固效果,结果显示温度和电导率之间以及温度与土壤和孔隙水电导率之间具有一定的线性关系。铁电极试验组阴极的平均阴极接触电阻比EKG电极试验组的小60%,而EKG试验组的平均阳极接触电阻比铁电极试验组的小56%。EKG电极试验组和铁电极试验组单位质量污染物的能耗分别为1.895 kJ/g和1.989 kJ/g。电渗后土壤孔隙数量增加,但平均面积减少,平均面积为0.9100～1.0504μm^2。通过微观结构分析,获得了较高的电渗效率,实现了宏观和微观参数间的有效分析和利用。

关 键 词：EKG contaminated soil electrical conductivity ion transport MICROSTRUCTURE 

分 类 号：X53[环境科学与工程—环境工程]