模拟镉污染土壤的电动力学修复研究

采用阳离子交换膜调控电解过程中pH值的变化和电解富集土壤中的元素,在pH=5.0的缓冲溶液中进行土壤的电动强化处理.通过对镉形态的分析,找到镉在电场中迁移转换的规律.在处理时间内,阳极附近镉的去除率达99%以上,阴极镉的富积系数达2.026,表明电场对土壤中重金属的迁移溶出有强化去除作用.

STUDY OF ELECTROKINETIC REMEDIATION OF SIMULATED CADMIUM CONTAMINATED SOIL

A preliminary investigation of physico-chemical properties of the soil has been made. An electrokinetic remediation experiment uses cation exchange membrane to control the pH of the operating soils and to enrich and reclaim the heavy metals. It is shown that eclectic current can effectively break up the chelation bounds of heavy metal and soil particles. Electrokinetic remediation is an effective way to remove heavy metals from soil. In this work, soil was electrolyzed at pH = 5.0 and species of cadmium element in soil were tested. The results shown that cadmium is concentrated in cathode region and removed from anode region. The removal rate is more than 99% in anode region. It is shown that electric field can improve the effects of remediation, and the electrokinetic remediation is a Dromising technology for soil restoration.