CeO_2 NPs短期作用对活性污泥系统水处理效果影响研究

Short-term Effects of CeO_2 NPs on Wastewater Treatment in Activated Sludge System

通过活性污泥3 h呼吸抑制试验,表明氧化铈纳米颗粒(Ce O2NPs)对活性污泥系统中的好氧微生物具有毒性作用,且它对微生物的呼吸抑制作用与浓度呈正相关,浓度越高呼吸抑制作用越明显。研究了1和10 mg/L的Ce O2NPs短期作用(1周期和20 d)后对活性污泥系统水处理效果和污泥沉降性能的影响。结果表明,1和10 mg/L的Ce O2NPs暴露一周期后,下一周期内实验组COD、NH4+-N、NO3--N、NO2--N、TN、TP的浓度变化曲线与对照组变化趋势基本保持一致。经过20 d运行后,不同浓度的Ce O2NPs也未对活性污泥系统有机物、氮磷去除和活性污泥沉降性能产生明显影响。

Through three hours activated sludge respiratory inhibition test, the research confirmes that CeO2 NPs has toxic effects on aerobic microorganisms, its respiratory inhibition on microbial is positively correlation with the concentration of CeO2 NPs, higher concentration induces stronger toxicity. Short-term （1 cycle and 20 days） effects of l and 10 mg/L CeO2 NPs on the quality of effluent and sludge settling performance were studied. The results shows that the variations of COD, NIL＊--N, NOa--N, NO2--N, TN, TP during one cycle after one cycle exposure to 1 and 10 mg/L CeO2 NPs in experiment groups are relatively similar to those in the control group. After 20 days running, different concentrations of CeO2 NPs don＇t cause significant impacts on organic matter, nitrogen, phosphorus removal and sludge settling properties of activated sludge system.