Institute of Water Quality Control, Technische Universität München, Am Coulombwall, 85748 Garching, Germany.
Water Res. 2011 Jul;45(13):3863-70. doi: 10.1016/j.watres.2011.04.043. Epub 2011 May 11.
Removal of heavy metals by an enriched consortium of sulfate-reducing bacteria (SRB) was evaluated through the abundance of SRB, sulfate reduction, sulfide production and heavy metal precipitation. Five parallel anaerobic semi-continuous stirred tank reactors (CSTR, V = 2 L) (referred as R1-R5) were fed with synthetic wastewater containing mixtures of Cu(2+), Zn(2+), Ni(2+), and Cr(6+) in the concentrations of 30, 60, 90, 120, and 150 mg L(-1) of each metal and operated with a hydraulic retention time of 20 days for 12 weeks. The loading rates of each metal in R1-R5 were 1.5, 3, 4.5, 6, and 7.5 mg L(-1) d(-1), respectively. The results showed that there was no inhibition of SRB growth and that heavy metal removal efficiencies of 94-100% for Cu(2+), Zn(2+), Ni(2+), and Cr(6+) were achieved in R1-R3 throughout the experiment and in R4 during the first 8 weeks. The toxic effect of heavy metals on the SRB consortium was revealed in R5, in which no SRB could survive and almost no heavy metal precipitation was detected after four weeks of operation.
通过硫酸盐还原菌 (SRB) 的丰度、硫酸盐还原、硫化物生成和重金属沉淀来评估富含硫酸盐还原菌的联合体对重金属的去除效果。采用含有 Cu(2+)、Zn(2+)、Ni(2+)和 Cr(6+)的混合金属（每种金属浓度为 30、60、90、120 和 150mg/L）的合成废水，在水力停留时间为 20 天的条件下，平行运行了 5 个厌氧半连续搅拌槽式反应器 (CSTR，V=2L)（记为 R1-R5），每个金属的加载速率分别为 1.5、3、4.5、6 和 7.5mg/L/d。结果表明，在整个实验过程中，R1-R3 中的 SRB 生长没有受到抑制，且对 Cu(2+)、Zn(2+)、Ni(2+)和 Cr(6+)的去除效率达到了 94-100%，而在 R4 中在前 8 周内也是如此。在 R5 中则揭示了重金属对硫酸盐还原菌联合体的毒性作用，在运行 4 周后，没有 SRB 存活，且几乎没有检测到重金属沉淀。
