摘要
以镉污染的高岭土为研究对象,考察了动电修复中通电时间和施加电压对处理效果的影响.结果表明,延长通电时间可提高镉的去除比例,通电7d后从阳极开始的18cm范围内镉含量显著降低;提高操作电压,也可提高镉的去除率.但由于阴极处pH较高,试验中均发现此处高浓度镉的富集.在阴极和土壤之间加设阳离子交换膜,使整个土样均保持较低的pH值,避免了阴极附近pH值的升高,防止了镉的富集.图6,表2,参10.
In this study,kaolinite from a lead-zinc mining district,which was spiked with cadmium,were treated by electrokinetic to investigate effects of treatment time and applied voltage gradient.The results showed that the increased test duration induced a higher removal rate of cadmium. Being treated for 7 days,cadmium was removed from kaolinite dramatically.It was also found that higher removal rate was generated with higher voltage gradient.However,increase in pH near the cathode caused enrichment of cadmium.Moreover,it was observed that cation exchange membrane which was placed between kaolinite and cathode could make pH of soil lower than the initial pH and avoid the higher pH near the cathode.As a result of the low pH,there was no enrichment of cadmium.6figs.,2tabs.,10refs.
出处
《湖南科技大学学报（自然科学版）》
CAS
2004年第3期78-80,共3页
Journal of Hunan University of Science And Technology：Natural Science Edition
基金
高校优秀青年教师教学科研奖励计划资助项目(编号:20010170)
关键词
铅锌矿区
土壤污染
镉污染
动电修复技术
electrokinetic remediation
cadmium
contaminated soils
lead-zinc mining district
