通过TTC和INT电子传递系统活性测试评估重金属对活性污泥的抑制作用。

Evaluation of heavy metal inhibition of activated sludge by TTC and INT-electron transport system activity tests.

作者信息

Yin J, Tan X J, Ren N Q, Cui Y B, Tang L

机构信息

Department of Environmental Engineering, Jilin Architectural and Civil Engineering Institute, Changchun, PR China.

出版信息

Water Sci Technol. 2005;52(8):231-9.

PMID:16312972

Abstract

TTC and INT-electron transport system activity tests were compared for assessing heavy metal inhibition of activated sludge. The median inhibitory concentrations (IC50s) of Cu2+, Zn2+, Cd2+, Hg2+, Ni2+, Pb2+ and Ag+ measured via TTC test were lower than those measured via INT test, which indicates that the INT-electron transport system activity test was less sensitive to heavy metal toxicity than the TTC test. Tested heavy metals brought about similar decrease in TTC-electron transport system activity and COD removal rate, but less decrease in INT-electron transport system activity than COD removal rate, which suggests that the TTC-electron transport system activity is a better parameter for reflecting heavy metal inhibition of activated sludge than INT-electron transport system activity. The ranking of tested heavy metals in order of decreasing toxicity based on TTC test was Hg2+, Cd2+, Cu2+, Ag+, Zn2+, Ni2+ and Pb2+, and the ranking based on INT test was Hg2+, Ag+, Cu2+, Cd2+, Zn2+, Ni2+ and Pb2+.

摘要

比较了TTC和INT-电子传递系统活性测试，以评估重金属对活性污泥的抑制作用。通过TTC测试测得的Cu2+、Zn2+、Cd2+、Hg2+、Ni2+、Pb2+和Ag+的半数抑制浓度（IC50）低于通过INT测试测得的结果，这表明INT-电子传递系统活性测试对重金属毒性的敏感性低于TTC测试。测试的重金属使TTC-电子传递系统活性和化学需氧量（COD）去除率出现类似程度的下降，但INT-电子传递系统活性的下降幅度小于COD去除率，这表明与INT-电子传递系统活性相比，TTC-电子传递系统活性是反映重金属对活性污泥抑制作用的更好参数。基于TTC测试，测试的重金属毒性由高到低的排序为Hg2+、Cd2+、Cu2+、Ag+、Zn2+、Ni2+和Pb2+，基于INT测试的排序为Hg2+、Ag+、Cu2+、Cd2+、Zn2+、Ni2+和Pb2+。