Evaluation of TTC-electron transport system activity and OUR tests for heavy metal inhibition of activated sludge
TTC-electron transport system activity and OUR 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 the two tests were similar, which indicates that the TTC-electron transport system activity was similarly sensitive to heavy metal toxicity to OUR. Both TTC-electron transport system activity and OUR assessed favourably the changes in COD removal rate under heavy metal inhibition, which suggests that TTC-electron transport system activity and OUR are better parameters for reflecting heavy metal inhibition of activated sludge. The ranking of tested heavy metals in order of decreasing toxicity based on TTC test was Hg2+, Ag+, Cu2+, Cd2+, Zn2+, Ni2+ and Pb2+, and the ranking based on OUR test was Hg2+, Cu2+, Ag+, Cd2+, Zn2+, Ni2+ and Pb2+. Classification analysis via the IC50s of heavy metals based on TTC-electron transport system activity and OUR tests was employed to classify tested heavy metals according to their toxicity. The seven tested heavy metals could be classified into three types: (ⅰ) Cu2+, Ag+, Hg2+ and Cd2+, (ⅱ) Zn2+ and Ni2+, (ⅲ) Pb2+.
activated sludge COD electron transport system activity heavy metals OUR TTC
Xuejun Tan Li Tang
Research & Development Center Shanghai Municipal Engineering Design General Institute Shanghai, Chin College of Environmental Science & Engineering Tongji University Shanghai, China
国际会议
上海
英文
3033-3038
2008-05-16（万方平台首次上网日期，不代表论文的发表时间）