电动力修复技术去除城市污泥中的重金属研究

分析了城市污水处理厂污泥中重金属的形态，重点考察了不同形态的Cd、Zn在电动力作用下的去除率。结果表明，污泥经电动力作用5d后，对Cd、Zn的总去除率分别为64．50％、65．02％，其中对易被植物吸收的非稳态（可交换态、碳酸盐结合态和铁锰氧化物结合态）Cd、Zn的去除效果尤为明显，去除率分别高达68．60％、75．73％。可见，应用电动力修复技术去除污泥中的重金属是可行的，修复后的污泥可进行土地利用。

Treatment of Heavy Metals in Municipal Sewage Sludge by Using Electroremediation Technique

The speciation of heavy metals in municipal sewage sludge was analyzed. The study focused on the feasibility of the electrokinetic technique for removing heave metals from the sludge and the removal efficiencies of different speciations of Cd and Zn. The results show that total removal efficiencies of Cd and Zn in municipal sewage sludge are 64.50% and 65.02% respectively after electroremediation for five days. The removal efficiencies of labile state fractions of Cd and Zn are 68.60% , 75.73% correspondingly. The labile state fractions that can be easily absorbed by plants include the exchangeable, carbonate and Fe and Mn oxides fraction. The electroremediation technique is fitted for removing heavy metals from municipal sewage sludge, and the electroremedied sludge is favorable to land utilization.