ToxTell生物传感器在Cu^(2+)、Zn^(2+)冲击活性污泥系统分析中的应用

Toxicities assessment of Cu^(2+) and Zn^(2+) on activated sludge by ToxTell biosensor

探讨了不同浓度Cu2+及Cu2+和Zn2+联合对活性污泥系统CODCr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5mg·L-1时,其对活性污泥工艺CODCr去除存在一定的促进作用,随着Cu2+浓度的增加,其对CODCr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1.5h时达到最大抑制状态,但随着曝气时间的延长,CODCr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CODCr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.

The effects of different concentrations of Cu2＋ and Cu2＋ and Zn2＋ combinations on CODCr 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 CODCr removal efficiency was gradually strengthened. CODCr removal reached its maximum inhibition efficiency at about 1.5 h, and with the extension of aeration time, the CODCr removal efficiency increased gradually. Single Cu2＋ and Cu2＋ and Zn2＋ combination toxicities determined with ToxTell biosensor were in accordance to the CODCr 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.