CAJ | 학술논문

为了改进传统电动修复铅污染土壤效率,采用交换电极电动修复技术对珠江三角洲区域一铅酸电池厂附近的铅污染土壤进行修复.研究铅去除效率和土壤pH值的变化与修复时间及交换频率的关系.结果表明:当工作电压梯度为1 V/cm,交换间隔为48 h,铅去除效率最大值达到87.7%,远远大于传统固定电极方向运行模式的去除效率(61.8%).另外,采用交换电极电动修复可以消除传统固定电极方向运行出现的"聚焦效应",而且不用添加化学试剂.讨论了交换电极技术中铅在土壤中电迁移的机理.
위료개진전통전동수복연오염토양효솔,채용교환전겁전동수복기술대주강삼각주구역일연산전지엄부근적연오염토양진행수복.연구연거제효솔화토양pH치적변화여수복시간급교환빈솔적관계.결과표명:당공작전압제도위1 V/cm,교환간격위48 h,연거제효솔최대치체도87.7%,원원대우전통고정전겁방향운행모식적거제효솔(61.8%).령외,채용교환전겁전동수복가이소제전통고정전겁방향운행출현적"취초효응",이차불용첨가화학시제.토론료교환전겁기술중연재토양중전천이적궤리.
To improve the conventional electrokinetic remediation of Pb-contaminated soil, the Pb-contaminated soil near a lead acid battery factory in the Pearl River Delta region of China was electrokinetically remedied with polarity exchange technique. The variations in Pb removal efficiency and the soil pH value with the treatment time and the exchange polarity interval were determined. It is found that the removal efficiency of Pb reaches a maximum of 87.7% when the voltage gradient is 1 V/cm and the exchange polarity interval is 48 h. This value is far higher than that obtained with conventional electrokinetic remediation (61.8%). Additionally, the "focusing effect" which appears in the conventional electrokinetic remediation can be avoided, and thus additional chemicals are not needed for the polarity exchange technique. The mechanism of Pb electromigration behavior in soil during the treatment with the polarity exchange technique was described.