底物对浓缩污泥中重金属生物淋滤的影响

通过接种经驯化分离和富集培养的污泥固有硫杆菌,在不同底物条件下对浓缩污泥中的重金属进行生物淋滤处理,并对污泥中重金属的滤除及酸化过程进行探讨。试验结果表明:相对于单一的FeSO4.7H2O和S粉作底物,两者配合使用可以加速污泥中重金属(Zn和Cu)的浸出,提高滤出率,经过14d的生物淋滤,Zn和Cu去除率分别达到77.9%和57.5%。污泥经生物淋滤之后,挥发性固体(VS)有不同程度的降低;过长时间的酸化使污泥的肥分受到影响,N的流失率为38.3%～59.9%,P的流失率为43.3%～62.1%。

Effect of Substrates on Bioleaching of Heavy Metals from Thickened Sludge

Bioleaching of heavy metals from thickened wastewater sludge with different substrates was studied with indigenous Thiobacillus isolated from native sludge and enriched by selected mediums. Results showed that removal of heavy metals with mixed substrate of FeSO4.7H2O and S was better than that with only S or FeSO4.7H2O. The leaching of Zn and Cu was accelerated with mixed substrate of FeSO4.7H2O and S. After 14 day bioleaching, removal of Zn and Cu reached 77.9% and 57.5%. During experiments, VS in the sludge decreased and 38.3%～59.9% of nitrogen and 43.3%～62.1% of phosphorous were lost because of long time acidification.