Ni^(2+)对生物除磷性能及微生物的影响

EFFECTS OF Ni^(2+) ON BIOLOGICAL PHOSPHORUS REMOVAL PERFORMANCE AND MICROORGANISM

在序批式反应器中探究了污染物Ni^(2+)对生物除磷性能及微生物的影响。结果表明:Ni^(2+)对生物除磷性能的影响与Ni^(2+)的浓度有关,低浓度Ni^(2+)对生物除磷性能影响不明显,而高浓度Ni^(2+)抑制生物除磷。当Ni^(2+)的浓度由0增加至10.0 mg/L时,生物除磷效率由92.3%下降至12.5%。此外,Ni^(2+)同样抑制厌氧释磷、好氧吸磷、有机质去除和内聚物合成。微生物种群分析表明,Ni^(2+)能够减少聚磷菌(PAO)的相对丰度,增加聚糖菌(GAO)的相对丰度。

In this study,the effect of Ni^（2＋）on biological phosphorus removal（BPR） and microbes were explored in the sequencing reactor. Results showed that the effect of Ni^（2＋）on the BPR was related to the concentration of Ni^（2＋）. The effect of low concentration of Ni^（2＋）on the BPR was not obvious,while high concentration of Ni^（2＋）inhibited the BPR. When the concentration of Ni^（2＋）increased from 0 to 10. 0 mg/L,the efficiency of BPR decreased from 92. 3% to 12. 5%. In addition,Ni^（2＋）also inhibited the anaerobic release of phosphorus,aerobic phosphorus absorption,removal of organic matter and the synthesis of the polymer. Microbial population analysis showed that Ni^（2＋）could reduce the relative abundance of phosphorus accumulating organisms（PAO） and increase the relative abundance of glycogen accumulating organisms（GAO）.