气升式生物反应器中本地硫氧化细菌对污染沉积物中重金属的生物浸出：硫浓度的影响

Bioleaching of heavy metals from contaminated sediment by indigenous sulfur-oxidizing bacteria in an air-lift bioreactor: effects of sulfur concentration.

作者信息

Chen Shen-Yi, Lin Jih-Gaw

机构信息

Institute of Environmental Engineering, National Chiao Tung University, 75 Po-Ai Street, Hsinchu, Taiwan.

出版信息

Water Res. 2004 Aug-Sep;38(14-15):3205-14. doi: 10.1016/j.watres.2004.04.050.

DOI:10.1016/j.watres.2004.04.050

PMID:15276736

Abstract

The effects of sulfur concentration on the bioleaching of heavy metals from the sediment by indigenous sulfur-oxidizing bacteria were investigated in an air-lift reactor. Increasing the sulfur concentration from 0.5 to 5 g/l enhanced the rates of pH reduction, sulfate production and metal solubilization. A Michaelis-Menten type equation was used to explain the relationships between sulfur concentration, sulfate production and metal solubilization in the bioleaching process. After 8 days of bioleaching, 97-99% of Cu, 96-98% of Zn, 62-68% of Mn, 73-87% of Ni and 31-50% of Pb were solubilized from the sediment, respectively. The efficiency of metal solubilization was found to be related to the speciation of metal in the sediment. From economical consideration, the recommended sulfur dosage for the bioleaching of metals from the sediment is 3g/l.

摘要

在气升式反应器中研究了硫浓度对本地硫氧化细菌从沉积物中生物浸出重金属的影响。将硫浓度从0.5 g/l提高到5 g/l可提高pH值降低、硫酸盐生成和金属溶解的速率。采用米氏方程来解释生物浸出过程中硫浓度、硫酸盐生成和金属溶解之间的关系。生物浸出8天后，沉积物中分别有97 - 99%的铜、96 - 98%的锌、62 - 68%的锰、73 - 87%的镍和31 - 50%的铅被溶解。发现金属溶解效率与沉积物中金属的形态有关。从经济角度考虑，从沉积物中生物浸出金属的推荐硫用量为3 g/l。