摘要
在序批式活性污泥反应器(SBR)中探究了新型污染物纳米氧化铜(CuO NP)短期和长期暴露对实际废水生物脱氮除磷的影响并分析了影响机制。结果表明:0~10.0mg/L CuO NP短期暴露对生物脱氮除磷效率及活性污泥性能影响不明显;经过30d长期暴露,CuO NP对生物脱氮除磷效率产生了严重的抑制作用,且CuO NP浓度越高,抑制效果越明显。CuO NP由0mg/L增加到10.0mg/L时,生物脱氮效率由90.6%下降至79.8%,生物除磷效率由91.6%下降至70.5%。CuO NP长期暴露能够抑制胞内聚合物聚羟基脂肪酸酯(PHA)的合成,近而减少其氧化分解产生的能量。此外,CuO NP还能抑制活性污泥呼吸速率。在10.0mg/L CuO NP作用下,呼吸抑制率为69.0%。
The effect of short term and long term exposure of the new type pollutant CuO nano particle （CuO NP） on the efficiencies of biological nitrogen and phosphorus removal from real wastewater and its mechanism were investigated in sequence batch reactor （SBR）. Experimental results showed that the range of 0-10. 0 mg/L CuO NP posed insignificant effect on biological nitrogen and phosphorus removal and the activited sludge performance after short term exposure. However,after 30 d long term exposure,the presence of CuO NP caused a serious inhibito-ry impact on the biological nitrogen and phosphorus removal？ with the higher CuO NP concentration, the greater in-hibitory effect. When the level of CuO NP increased from 0 mg/L to 10.0 mg/L, the biological nitrogen removal effi-ciency decreased from 90.6% to 79.8 %,and the biological phosphorus removal efficiency decreased from 91. 6 % to 70.5%. Further investigation suggested that long term exposure of CuO NP could inhibit the synthesis of intracellular polymer polyhydroxyalkanoates （PHA） , thereby affected the subsequent oxidation for energy utilization. Additional-ly,CuO NP inhibited respiration rate of activited sludge, and the respiration inhibitory rate was 69.0% under 10.0 mg/L CuO NP compared with that in control test.
出处
《环境污染与防治》
CAS
CSCD
北大核心
2017年第6期626-630,634,共6页
Environmental Pollution & Control
基金
宜宾学院青年基金资助项目(No.2012S02)
关键词
纳米氧化铜
暴露
生物脱氮除磷
胞内聚合物
CuO nano particle
exposure
biological nitrogen and phosphorus removal
intracellular polymer
