【摘要】 本研究从剩余活性污泥中分离得到两株土著硫杆菌。对两株菌进行了分类鉴定。确立二者分别为嗜酸性氧化亚铁硫杆菌(Acidithiobacillus ferrooxidans,A.f)和嗜酸性氧化硫硫杆菌(Acidithiobacillus thiooxidans,A.t)。将二者的单菌和混合菌分别接种于剩余活性污泥中,进行了为期9d的生物淋滤,对淋滤过程中的pH变化、氧化还原电位(ORP)以及重金属含量进行了检测。结果表明,生物淋滤9d混合菌对于As、Cr、Cu、Ni和Zn的去除效果最好;去除率分别达到了96.09%、93.47%、98.32%、97.88%和98.60%。对于Cd和Pb混合菌生物淋滤的去除率在第6天之后迅速下降,但是A.t单菌淋滤保持较高的去除率。更多还原

【Abstract】 Native Acidithiobacillus ferrooxidans (A. f) and Acidithiobacillus thiooxidans (A. t) were isolated from excess activated sludge. Mixed and single cultures of them were used to bioleach for 9 days to remove heavy metals from activated sludge. The changes of pH and ORP (Oxidation Reduction Potential) were measured every day. Also, the changes of concentrations for heavy metals were measured. Results showed that the removing rate for mixed culture was the best in all runs. The removing rate for As, Cr, Cu, Ni, Zn is 96.09%, 93.47%, 98.32%, 97.88%, 98.60% respectively. The removing rate of Cd and Pb for mixed culture decreased rapidly after six days. However, the rates of removing Cd and Pb remained higher levels after leaching for 6 days by Acidithiobacillus thiooxidans.更多还原