镍对活性污泥生物除磷的影响及其机理

以实际生活污水为研究对象，在序批式活性污泥反应器中探究了Ni2+对活性污泥形态及生物除磷性能的影响。实验结果表明，Ni2+能够抑制生物除磷，当Ni2+质量浓度由0 mg/L增加至10.0 mg/L时，PO43--P去除率由93%下降至12%。机理研究结果表明：Ni2+能抑制聚磷微生物的厌氧释磷和好氧吸磷，并能抑制内聚物聚羟基烷酸酯（PHA）的合成；当Ni2+质量浓度为10.0 mg/L时，PHA的最大含量仅为2.4 mmol/g （以单位质量挥发性悬浮物所含PHA中C的物质的量计），远低于空白组中PHA的含量。此外，Ni2+还对微生物群落的组成产生影响，并促进活性污泥中聚糖微生物的增殖。

Effect of nickel on biological phosphorus removal from activated sludge and its mechanism

The effect of Ni2+ on morphology and biological phosphorus removal capability of activated sludge was investigated in a sequencing batch reactor using actual domestic sewage as research object. The experimental results showed that biological phosphorus removal could be inhibited by Ni2+，and when the mass concentration of Ni 2+ increased from 0 mg/L to 10.0 mg/L，the removal rate of PO43--P decreased from 93% to 12%. The mechanism research results showed that：Ni2+ could inhibit the anaerobic phosphorus release and aerobic phosphorus uptake by polyphosphate accumulating organisms and the synthesis of polyhydroxyalkanoates（PHA）；When the mass concentration of Ni2+ was 10.0 mg/L，the maximum amount of PHA（based on C mole number of PHA in a unit mass of volatiles） was only 2.4 mmol/g，which was much lower than that in the blank group. In addition，Ni2+ could also affect the composition of microbial community and promote the proliferation of glycogen accumulating organisms in activated sludge.