重金属污染河涌底泥的电动-竹炭联合修复  

Remediation of Heavy Metals Polluted Sediment by Electrokinetics and Bamboo Charcoal

作　　者：谢国樑[1] 王德汉[1] 林丹妮[1] 

机构地区：[1]华南农业大学资源环境学院,广州510642

出　　处：《华中农业大学学报》2009年第2期174-178,共5页Journal of Huazhong Agricultural University

基　　金：广东省自然科学基金项目(06025856)资助

摘　　要：以柠檬酸预处理、竹炭吸附、电极周期性切换作为强化手段,采用电动修复技术,设计了非竹炭吸附区、竹炭吸附区、竹炭吸附区联合电极切换等3个处理,分析了试验过程中电流及电渗流的变化,以及试验完成后土壤pH和电导率的迁移分布,并对每组试验中重金属的去除效率和各截面重金属的迁移分布进行了探讨。结果表明:柠檬酸预处理能降低底泥初始pH,提高底泥电导率,有利于重金属的去除;添加竹炭,有利于重金属从底泥中迁出,显著提高重金属的去除率,本试验条件下,重金属Zn、Ni的平均去除率分别可达80.95%、68.26%;周期性切换电极可以维持底泥中的pH和电导率,防止重金属在两极的富集,提高重金属的迁移效率。The enhancement measures that pretreated by citric acid,bamboo charcoal adsorbed and electrode switch periodicity were applied. Three groups of experiment were performed with the bamboo charcoal,without the bamboo charcoal and with the bamboo charcoal-electrode switch periodicity. The distribution of pH and EC,as well as the variation of the current and current flow during the experiment was analyzed and the remove efficiency of heavy metal and their distribution in the four slices was discussed. The results indicated that pretreated by citric acid could optimize pH and improve EC of the sediment could improve removability of the heavy metal. In the new electrokinetic technique combining with the bamboo charcoal could obviously improve the removable rate of heavy metals with Zn, Ni being 80. 95%,68. 26%. Electrode switch periodicity could well retain the pH and EC with improving the removment of the heavy metals. To improve remediation efficiency, the adsorption characteristics of bamboo charcoal and the period of electrode switch should be studied further.

关 键 词：电动力学修复 竹炭 重金属 修复效率 

分 类 号：X781.1[环境科学与工程—环境工程]