Pb^(2+)对校园污水SBR系统的影响

Effect of Pb2+ on SBR System of Campus Sewage

研究了在COD去除和脱氮除磷两种运行模式下Pb2+对校园污水SBR处理系统的影响。通过曲线模拟,发现在COD去除模式和脱氮除磷模式下,Pb2+对SBR胁迫的临界浓度分别为34.800和0.214 mg/L,脱氮除磷模式对Pb的胁迫比COD去除模式更为敏感。在Pb临界浓度内,污水SBR处理系统中的污泥对Pb的平均富集系数仅为0.060 7,且污泥中Pb的含量远远低于农用污泥中污染物控制标准GB4284-84(300 mg/kg)。Pb对污水SBR处理系统的运行有一定的胁迫作用。污水SBR中的污泥对Pb的富集风险不大。

The effects of Pb^2 ＋ on SBR system of campus sewage were studied in operation modes of COD removal and nitrogen and phosphorous removal. It was found through curve simulation that the critical concentrations of Pb^2＋ stress on SBR was 34.800 mg/L and 0.214 mg/L respectively in the COD removal mode and nitrogen and phosphorus removal mode.The nitrogen and phosphorous removal mode was morn sensitive to Pb stress than COD removal mode. In the critical concentrations of Pb, the average enrichment coefficient on Pb of the sludge in SBR sewage disposing system was just 0.060 7 and the Pb content in the sludge was far below the control standard GB4284-84 （300 mg/kg） of pollutants in agri-sludge. Pb had some stress effect on the operation of SBR sewage disposing system, but the enrichment risk of Pb in the sludge of SBR sewage was not big.