槐糖脂优化重金属污染污泥电动修复实验研究

Experimental Study on Sophorolipid Complexation on Electrokinetic Remediation of Heavy Metals from Sewage Sludge

通过不同的电极布置形式和生物表面活性剂槐糖脂含量的组合实验,对比了对污染污泥电动修复处理效果的影响,研究超标重金属Zn、Cu、Ni、Cd迁移规律。结果表明,实验后阳极污泥中重金属含量最低,中部积聚最为严重;电极上下布置时同一高度上的重金属含量无明显差别,而在左右布置时阳极和阴极区上部的重金属含量高于中部和底部;上下布置较左右布置不同重金属去除效果均提升了1倍以上。添加槐糖脂可以提高Zn、Cu、Cd的去除率,但Ni的提升效果不明显。当槐糖脂的质量分数为0.1%时去除效果为优,阳极区Zn、Cu、Ni、Cd去除率分别可达到47.99%、28.60%、26.29%、25.82%。推荐在实际工程中电极板采用上下布置方式,同时辅以槐糖脂强化电动修复效果。

Aiming at study on the effects of electrokinetic remediation of heavy metals from sewage sludge, combination experiment was carried out with different electrode arrangements and sophorolipid content. The transferring disciplinarian of four excessive heavy metals (Zn, Cu, Ni, Cd) were studied. The results showed that, the content was lowest in anode region, while it accumulated a lot of heavy metals in middle region after experiment. When applying electrode arrangements on top and bottom, heavy metal concentrations at the same depth were no significant difference. However, in the anode and cathode region, the concentrations of heavy metals at the top were higher than at the middle and bottom by using electrode arrangements on left and right. Besides, electrode arrangements on top and bottom had a better performance than on left and right, which could increase the removal rate by one times. After electrokinetic remediation experiment, the removal rates of Zn, Cu, Cd increased obviously with the addition of sophorolipid, while it increased a little for Ni removal rate. When the mass concentration of sophorolipid was 0.1%, the removal rates of Zn, Cu, Ni and Cd reached 47.99%, 28.60%, 26.29% and 25.82% respectively. It is recommended applying electrokinetic remediation with sophorolipid and top/bottom electrode arrangement in ex-situ treatment.