微生物淋溶法去除污泥中的重金属

摘要

In order to reduce the harm of heavy metals in sludge to environment, the effect of medium pH, microorganism inoculation amount, leaching temperature, and cycle leaching time on removal of heavy metals was studied by single factor experiment, and the content change of heavy metals in the process of leaching under the optimal conditions was analyzed. The results show that the leaching liquid pH decreased as the process of removal of heavy metals progresses, and that the optimal medium pH, microorganism inoculation amount, leaching temperature, and cycle leaching time was 1.0, 15.0% , 30°C , and 24 h/d, respectively. Under the optimal conditions, the removal rate of Cd, Mn, Cu, Pb, and Zn was 88.0% , 88.0% , 69.0% , 67.0% , and 83.0% , respectively.%为了降低污泥中毒性重金属对环境的危害,采用单因素实验研究培养基的pH值、微生物的接种量、淋溶的温度及循环淋溶时间对重金属去除效果的影响及最优条件下污泥中重金属含量变化.结果表明:淋溶液的pH值随污泥中重金属的去除逐渐降低,培养基最佳的pH值为1.0,最佳微生物的接种量为15.0％,最佳淋溶温度为30℃,最佳循环淋溶时间为全天循环；在最佳工艺条件下,污泥中Cd、Mn、Cu、Pb和Zn的浸出率分别高达88.0％、88.0％、69.0％、67.0％和83.0％.