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研究报告

王鑫,贺莹,刘免,吴真,杨连珍,王学江.ToxTell生物传感器在Cu²⁺、Zn²⁺冲击活性污泥系统分析中的应用[J].环境科学学报,2012,32(5):1049-1053

Toxicities assessment of Cu²⁺ and Zn²⁺ on activated sludge by ToxTell biosensor

摘要：探讨了不同浓度Cu²⁺及Cu²⁺和Zn²⁺联合对活性污泥系统COD_Cr去除的影响,并采用ToxTell生物传感器,以活性污泥为指示微生物,分析了上述金属离子的毒性抑制作用.结果表明, Cu²⁺浓度为5 mg·L^-1时,其对活性污泥工艺COD_Cr去除存在一定的促进作用,随着Cu²⁺浓度的增加,其对COD_Cr的去除的抑制作用逐渐增强;Cu²⁺及Cu²⁺和Zn²⁺对活性污泥系统在抑制时间为1.5 h时达到最大抑制状态,但随着曝气时间的延长,COD_Cr去除率呈逐渐上升趋势.ToxTell生物传感器对Cu²⁺和Zn²⁺的混合毒性具有良好的分析性能,其毒性分析结果与活性污泥工艺中COD_Cr的去除抑制率具有良好的一致性,初步证实该生物传感器能很好地用于活性污泥处理系统受Cu²⁺和Zn²⁺冲击的预警监测.

Abstract：The effects of different concentrations of Cu²⁺ and Cu²⁺and Zn²⁺ combinations on COD_Cr removal performance in activated sludge system were investigated, and the ToxTell biosensor with activated sludge was developed to determine the toxicities of Cu²⁺ and Cu²⁺and Zn²⁺ combinations. The results showed that there was a stimulative effect on the activated sludge process when Cu²⁺ concentration was at 5 mg·L^-1, and with its concentration increasing the inhibition of COD_Cr removal efficiency was gradually strengthened. COD_Cr removal reached its maximum inhibition efficiency at about 1.5 h, and with the extension of aeration time, the COD_Cr removal efficiency increased gradually. Single Cu²⁺ and Cu²⁺and Zn²⁺ combination toxicities determined with ToxTell biosensor were in accordance to the COD_Cr removal inhibition effects, which showed that the ToxTell biosensor could be used well in the early warming determination of Cu²⁺ and Zn²⁺in activated sludge process.