长江科学院院报2017，Vol.34Issue(9)：19-23,5.DOI:10.11988/ckyyb.20160438
不同pH调控方法对电助淋洗去除农田土壤Cd的影响
Effect of pH Regulation Method on Cadmium Removal inPaddy Soils by Electrokinetic Leaching
摘要
Abstract
Leaching is a simple and efficient way of soil restoration, but the effect on soil of low permeability is unsatisfactory.In view of this, electrokinetic remediation was taken to promote the efficiency of leaching of cadmium-contaminated paddy soils , and the influence of electrolyte pH control on the pH value of soil and the removal of heavy metal Cd was discussed in this paper.Results showed that when voltage gradient is 1.5 V/cm, working for five days intermittently and 8 hours every day continuously, the removal efficiency of Cd in electrokinetic leaching(Ex1) reached 50.87%, 10% higher than test Ex0 which was only simple leaching;electrokinetic remediation could strengthen the flow of pore water in the soil, accelerate the migration of Cd2+ in pore water of soil, improve the removal rate of Cd, and effectively promote the leaching effect of Cd in farmland soil.Compared with test Ex1 in which electrolyte pH was uncontrolled, tests Ex2, Ex3, and Ex4 could control the soil''s pH value and improve the mobility efficiency of Cd2+ in pore water of soil.Therefore, when factors such as site operation were considered, polarity switching technology would be a good choice in controlling soil''s pH value.关键词
农田土壤/重金属Cd/电助淋洗/电解液pH控制/电极极性切换Key words
paddy soil/cadmium/leaching-electrokinetic/electrolyte pH control/polarity switching分类
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胡艳平,林莉,李青云,罗希..不同pH调控方法对电助淋洗去除农田土壤Cd的影响[J].长江科学院院报,2017,34(9):19-23,5.基金项目
水利部公益性行业科研专项(201501019) （201501019）
中央级公益性科研院所基本科研业务费项目(CKSF2015014/SH) （CKSF2015014/SH）
