污染土壤电动修复增强方法研究进展

污染土壤电动修复是一项新兴绿色原位修复技术。其原理是在土壤上施加直流电场 ,利用电迁移和电渗去除污染物 ,土壤pH、Zeta电位以及土壤化学性质等因素影响电动修复效果。为了提高修复效率和扩大电动修复应用范围 ,现在已经发展了针对不同类型土壤和污染物的增强修复技术。本文归纳总结了 1995年以来土壤电动修复中常用增强处理效果的 8种方法 ,即酸碱中和法、阳离子选择膜法、电渗析法、络合剂法、表面活性剂法、氧化 还原法、EK 生物联用和LasagnaTM法 ,且对每种方法的典型实验装置、增强原理、方法特点和适用范围等进行了分析和讨论 ,为以后的实验设计提供了有益的参考

Progress on enhancement methods for electrokinetic remediation of contaminated soil

Electrokinetic remediation is an emerging green technology which is employed to remove contaminants from soil especially fine-grained soil in-situ. Contaminants are removed primarily through electromigration and electroosmotic advection controlled by a direct-current electric field across the soil. However there are many factors such as soil pH, Zeta potential and soil chemistry which may enhance or retard the cleanup process. In order to improve the remediation efficiency and broaden its application, many enhancement techniques have been developed according to soil types and contaminants characters. This paper has summarized eight enhancement methods that have been used mostly since 1995 which includes acid and alkali neutralization, cation selective membrane, electrodialytic remediation, complexing agents, hydrophobic organic contaminants facilitating agents, redox method, combination bacteria with electrokinetics, the Lasagna technology. In every technique a typical apparatus is listed and its principle of enhancement, advantage as well as application field are discussed. These information offer a good reference for future experimental designs for electrokinetic remediation of contaminated soils.