Abstract: Bioleaching of six kinds of heavy metals (Zn, Cu, Pb, Cd, Cr and Ni) from sewage sludge with different substrates was studied, adopting S (concentrations of 5, 10 and 20 g/L), FeSO4·7H2O (concentrations of 10 and 20 g/L) and Na2S2O3 (concentrations of 10 and 20 g/L) as substrate. The results showed that acidification of S was best, because pH could reached about 2 at the forth day, and leaching of Zn、Cu、Pb、Cr and Ni achieved the maximum amount at concentrations of 10 and 20 g/L. Acidification and heavy metals leaching amount of FeSO4·7H2O were not as satisfied as that of S. Dealing with Na2S2O3 at the concentration of 10 g/L showed better results than with FeSO4·7H2O, while the concentration of Na2S2O3 was 20 g/L, filtrate was alkaline, heavy metals were difficult to filter out or even not to filter out.

Key words: sewage sludge, substrates, heavy metal, bioleaching technology

摘要： 以生污泥为材料，研究单质硫(浓度分别为5、10、20 g/L)、FeSO4?7H2O (浓度分别为10、20 g/L）和硫代硫酸钠（浓度分别为10、20 g/L）三种底物的不同浓度对污泥中Zn、Cu、Pb、Cd、Cr和Ni六种重金属生物淋滤效果的影响。结果表明：单质硫的致酸性最好，第4天pH值就达到2.0左右，Zn、Cu、Pb、Cr和Ni的滤出量最大（原污泥Cd未检出），并以底物投放浓度在10～20 g/L为佳。FeSO4?7H2O的致酸性和重金属滤出量较单质硫弱。硫代硫酸钠在浓度10 g/L时，致酸性和重金属的滤出量介于单质硫和FeSO4?7H2O之间，但浓度20 g/L时滤液呈碱性，重金属难于滤出甚至不滤出。