高电场强度下污染土壤电动修复的关键参数分析  

EFFECT OF ENHANCING ELECTRIC FIELD INTENSITY ON KEY PARAMETERS DURING ELECTROKINETIC REMEDIATION OF CONTAMINATED SOIL

作　　者：李瑞 吴波[1,3] 王卅 李刚[1,3] LI Rui1,2, WU Bo1,3 , WANG Sa1, 3, LI Gang1,3(1. Shenyang Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China;3. National-Local Joint Engineering Laboratory of Contaminated Soil Remediation by Bio-physicochemical Synergistic Process, Shenyang 110016, China)

机构地区：[1]中国科学院沈阳应用生态研究所,沈阳110016 [2]中国科学院大学,北京100049 [3]污染土壤生物-物化协同修复技术国家地方联合工程实验室,沈阳110016

出　　处：《环境工程》2018年第9期149-153,共5页Environmental Engineering

基　　金：致密油气开发环境保护技术集成及关键装备(2016ZX05040-005);国家自然科学基金(21507144)

摘　　要：探讨了高场强(15～20 V/cm)直流电修复污染土壤的可行性,重点分析了高电场强度下影响污染去除的关键参数,包括土壤pH值、土壤含水率、土壤温度、电流及电导率等变化。结果表明:土壤pH变化明显,与常规修复(2 V/cm)相比,电极两端土壤快速酸碱化;受电渗析影响,阴极附近土壤含水量增加,而阳极土壤干裂、温度升高;阳极区土壤电导率降低,与电流下降趋势同步。高场强条件下,阳极快速酸化与电渗流作用有利于重金属的迁移;而阳极附近土壤温度的增加,则有利于土壤中挥发性有机污染物去除。因此,提高场强的电动修复在某些复合污染土壤的修复中具有良好的应用前景。In this paper, the feasibility of electrokinetic remediation through high electric field intensity （15 ~ 20 V/cm） was investigated. The key parameters that affecting the removal of pollutants were analyzed, including soil pH, soil moisture content, soil temperature, current and conductivity. The results showed that the change of soil pH was violent in both ends of the electrode of the affected soil pH ; by electrodialysis, visible water was found at the cathode, but the temperature of soil near the anode was enhanced. The electrical conductivity of soil reduced near the area of the anode, and the trend was similar with the current. The anodie acidification and electroosmotic flow were beneficial to the migration of heavy metals, and the increase of anode temperature was beneficial to the removal of some volatile organic compounds in soil. Therefore, the higher electric field intensity had potential applications during the remediation of some contaminated soils.

关 键 词：电场强度 污染土壤 关键参数 

分 类 号：X53[环境科学与工程—环境工程]