电动力学-竹炭吸附联合修复工艺对高岭土中镉的去除  

REMOVAL OF CADMIUM IN KAOLIN BY ELECTROKINETICS-BAMBOO CHARCOAL ADSORPTION

作　　者：马建伟[1] 王慧[1] 李瑞瑞[1] 

机构地区：[1]清华大学环境科学与工程系,环境模拟与污染控制国家重点联合实验室,北京100084

出　　处：《环境化学》2007年第5期634-637,共4页Environmental Chemistry

基　　金：国家重点基础研究发展规划(973)项目(2004CB418506);国家高技术研究发展计划(863)项目(2004AA64920)

摘　　要：采用电动力学-竹炭吸附对高岭土中的镉进行迁移吸附去除,并对处理前后土体中的镉进行形态分析.结果表明,在电压梯度为1V.cm-1的条件下,电动力场能够将镉从土壤表面解吸附进入土壤水相,从而增大其电移动性,联合竹炭的强吸附作用对土壤中的镉有很高的去除效率,在190h的运行时间内能够将土体中93%的镉迁移吸附去除,定期切换电场极性提高了处理效率并可以很好地维持土壤的pH值和水分,过程的电流随切换呈周期性变化.The characteristic of migration and its influencing factor of cadmium in kaolin soil by uniform electrokinetics as well as the adsorption property by a new material-bamboo charcoal were investigated through bench scale experiments, and the distribution of the cadmium in the soil before and after the treatment were analyzed as well by sequential extraction. The results showed that the bamboo charcoal is good adsorption material which has comparably strong adsorption effect, bearing potential in future use; under an electric gradient of 1.0 V·cm^-1, elctrokinetics has a good desorption effect of cadmium from the surface of the soil to soil pore water, thus enhancing the electromigration of the ions ; with the new electrokinetic tech combining the bamboo charcoal with periodic polarity reversal, the cadmium in the soil could be wiped off with high efficiency and 93% of the total cadmium could be removed within 190h. The pH together with water content could be well retained; the electric current in the process changed periodically according to the reversal. This tech holds promising field use in future.

关 键 词：电动力学 镉 竹炭 高岭土 形态分布 联合修复工艺 土壤污染 

分 类 号：X132[环境科学与工程—环境科学]