不同电压对重金属污染河涌底泥电动修复效果的影响  

Effect of Different Applied Voltage on Electrokinetic Removal of Heavy Metals from Sediment

作　　者：林丹妮[1] 谢国樑[1] 曾彩明[1] 王德汉[1] 

机构地区：[1]华南农业大学资源环境学院,广东广州510642

出　　处：《华南农业大学学报》2009年第3期8-12,共5页Journal of South China Agricultural University

基　　金：广东省自然科学基金(06025856)

摘　　要：选用重金属污染严重的河涌底泥作为试验材料,设计了电压分别为20、25和30 V的3组试验,运行5 d,研究了电动修复过程中电压对修复效果的影响.结果表明:增加电压对电动过程中电渗流的影响不大,但提高了处理电流,所有电动修复后底泥的pH低于处理前.在不同电压处理下,阳极附近底泥中Zn、Cu、Ni去除率分别达80%、10%和64%以上.此外,3种重金属在阴极附近底泥中富集,富集程度分别为24%、10%和33%以上,重金属的富集影响总的去除率.考虑去除效果和能耗,25 V电压处理比较合适,阳极附近底泥中Zn、Cu、Ni的去除率分别高达94%、74%和87%,但底泥的总体去除率较低,分别为23%、4%和17%.电动修复对各种形态的重金属都有不同程度的去除,对弱酸态的去除最明显.The effect of electro-kinetic treatment on the removal of main heavy metals in sediment under various voltage drops was investigated. The sediment used in the study was sampled from electroplate factory. The sediment was polluted seriously by heavy metals. In this study three different voltages（20, 25 and 30 V）were applied, the experiments were operated 5d. The results showed that the treatments with different voltage drops had little influence on electroosmotie flow, but electric current were obviously increased. After the treatments, the pH values of sediment were lower than those of untreated sediment. The elimination effects of Zn, Cu, Ni near the anode were better, and the elimination rate were above 80%, 10% and 60% , respectively. Besides, the heavy metals were enriched near the cathode, the enrichment degrees of Zn,Cu,Ni were above 24% ,10% and 33% ,respectively. The enrichment of heavy metals influenced the electrokinetic removal efficiencies. According to the removal efficiencies and electric energy consumption,the suitable voltage of the treatment was 25 V. After the electrokinetic treatment of 25 V voltage drop was applied, the elimination rates of Zn, Cu, Ni near the anode were 94%,74% and 87% , while the total removal effieiencies were only 23% ,4% and 17%, respectively. It was found that all forms of heavy metals were removed partly, and among which the decrease of weak acid fractions were most significant.

关 键 词：河涌底泥 电动修复 重金属污染 电压 

分 类 号：X781.1[环境科学与工程—环境工程]