氧化锌纳米颗粒对污水生物除磷的影响及其机理研究

摘要

The effect of different concentrations of ZnO nanoparticles (NPs) on biological phosphorus removal (BPR) in sequencing batch reactor was investigated.Experimental results showed that..(1) low mass concentration of ZnO NPs (1 mg/L) caused no obvious effect on BPR,however,high mass concentration of ZnO NPs (32 mg/L) significantly decreased the efficiency of BPR,and the BPR efficiency decreased to 55％.(2) High concentration of ZnO NPs inhibited the anaerobic phosphorus release and oxic phosphorus uptake.When the mass concentration of ZnO NPs was 32 mg/L,the abundance of phosphorus accumulating organisms was only 21.6 ％,which was much lower than that in blank.Additionally,the key enzymes activities related to phosphorus removal in the presence of high ZnO NPs were also lower than those in blank.%在序批式反应器中探究了不同浓度氧化锌纳米材料(ZnO NPs)对污水生物强化除磷的影响.结果表明:(1)低质量浓度(1 mg/L)ZnO NPs对污水生物除磷影响不明显,而高质量浓度(32 mg/L)ZnO NPs能明显降低生物除磷效率(除磷效率仅为55％左右).(2)高浓度ZnO NPs的存在能抑制厌氧释磷和好氧吸磷.32 mg/L ZnO NPs作用下聚磷菌相对丰度仅为21.6％,明显低于空白组,与除磷相关的酶活也明显低于空白组.