铜离子对SBR工艺活性污泥毒性作用分析

Assessment of Copper Toxicity to Activated Sludge in SBR Process

探讨了不同浓度铜离子对序列间歇式反应器(SBR)活性污泥系统中化学需氧量CODCr、总氮(TN)和总磷(TP)等去除的影响,并采用ToxTell生物传感器,以SBR活性污泥为指示微生物,分析了铜离子的毒性抑制作用.结果表明,铜离子质量浓度低于10mg.L-1时,不会对该SBR系统带来明显的冲击作用,其质量浓度超过20mg.L-1时则会导致系统出水水质明显下降、活性污泥量及污泥沉降比(SV)降低和污泥絮体的解体;ToxTell生物传感器的毒性分析结果与CODCr,TN和TP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铜离子冲击SBR活性污泥系统的预警监测.

The effects of different concentrations of Cu2＋ ion on the removal of CODcr, TN and TP in sequencing batch reactor （SBR） system were investigated, and the ToxTell biosensor with activated sludge was also constructed to determine the toxicity of Cu2＋. The results show that there are not distinct impacts on the SBR process when Cu2＋ concentration is within 10 mg L-1 , and when it is over 20 mg L-1 , the effluent water quality decreases obviously, the activated sludge quantity and settling velocity（SV） reduce, and the sludge floc begins to disintegrate. The toxicity determined with ToxTell biosensor is corresponding to the CODcr, TN and TP removal performance, which shows that the ToxTell biosensor can be used well in the early warming determination of Cu2＋ in the SBR process.