利用氧化亚铁硫杆菌和氧化硫硫杆菌去除污泥中重金属的研究

Removal of Heavy Metals Contained in Sewage Sludges Using Thiobacillus Ferrooxidans and Thiobacillus Thiooxidans

重金属的去除是污水污泥处理中亟待解决的问题。生物浸出法是去除污泥中重金属的新兴方法,具有低成本、无二次污染等特点。利用由含硫温泉采集到的泉水,通过一系列培养、分离、纯化得到的氧化亚铁硫杆菌(T f)和氧化硫硫杆菌(T t)浸出污泥中的铜、锌、锰、铬、镉。在此基础上,比较了在不同底物浓度下用T f和T t分别浸出重金属的效果,研究了底物浓度、污泥浓度和起始pH等基本因素对重金属去除效果的影响。结果证明,T f去除重金属的效果比T t好,在T f和T t的作用下,污泥中大部分的重金属得到了有效的去除。

The removal of heavy metals from sewage sludges is a problem that is exigent to be solved. Bioleaching is a new method for removing heavy metals from sewage sludges. It is considered to be an effective method with low costs and without causing secondary pollution. In this study, bioleaching method was applied to leach metals such as Cu, Zn, Mn, Cr and Cd contained in sewage sludges. Firstly, thiobacillus ferrooxidans (T.f) and thiobacillus thiooxidans (T.t) were obtained from a hot spring containing sulphur after a series of cultivating, separating and purifying. Then, the leach characteristics of T.f and T.t were investigated at different levels of substrate respectively and the influences of some basic factors such as substrate concentration, sludge concentration and initial pH on removal of heavy metals during bioleaching were studied. The results show that the efficiency of removing heavy metals of T.f is better than T.t and most of the heavy metals contained in sewage sludge can be effectively removed by T.f and T.t.