摘要
在Cd污染的胶东棕壤土体两端加以1V/cm的直流电压梯度进行电动力学修复。考察了电动力学修复过程中阴阳极电解液pH、电渗流量和电流密度的变化,并将处理后的土体分6段进行了分析,主要参数为pH、电导率、土壤中Cd的浓度及其形态分析。结果表明,经过445.0h的电动力学修复,阳极附近3段土壤中Cd的去除率分别达到98.19%、97.01%和96.24%;阴极附近3段土壤中出现了Cd富集现象,且pH为5.88的土壤段Cd的富集率最高。
Series of laboratory electrokinetic treatment experiments were conducted for removing Cd from the brunisolic soil sample under a voltage gradient of 1 V DC/cm. During the treatment, the changes in electric current density, electro-osmotic flow and the pH of catholyte and anolyte were monitored. The treated soil sample was divided into six sections, according to its relative location between the electrodes, for further characterization of 5 cadmium species using the Tessier method. Cadmium was concentrated in the cathode region and removed from the anode region; the removal rates of the three sections near the anode region were respectively 98.19 %, 97.01%, 96.24 %. Cadmium was concentrated in the 3 sections closer to the cathode, with the highest Cd concentration found at the pH of 5.88; a cathodic pH of 〈5.88 is recommended for more effective removal of Cd employing the electrokinetic remediation system.
出处
《环境污染与防治》
CAS
CSCD
北大核心
2008年第2期25-28,共4页
Environmental Pollution & Control
基金
国家自然科学基金资助项目(No.20307009)
关键词
电动力学修复
镉
胶东棕壤
electrokinetic remediation
cadmium
brunisolic soil