A/O—MBR工艺处理城市污水的研究

Pilot-scale Test of A/O and Membrane Bioreactor for Municipal Wastewater Treatment

针对水资源短缺、水污染严重和用水量增加的状况,进行了膜生物反应器(MBR)处理城市污水的中试,考察了出水回用奥运公园的可行性。试验结果表明,系统出水SS、COD、氨氮、Fe、Mn的浓度分别为0、16.3、0.65、0.2、0.033 mg/L,去除率分别达到100%、94.5%、98.3%、99%和92.3%;出水浊度和细菌数分别为0.06 NTU、4 CFU/mL,去除率为99.7%和6-lg,出水水质优于城市杂用水水质标准(GB/T 18920—2002)。系统运行稳定,有较强的抗冲击负荷能力。膜过滤压差的变化和膜的清洗试验表明,DO和泥饼层增厚压密是影响膜污染的重要因素。

In order to alleviate the situation of water shortage, heavily polluted water and increased water consumption, a pilot-scale membrane bioreactor （MBR） was used to treat municipal wastewater, and feasibility of its effluent reuse was investigated. The results show that the effluent quality is stable and excellent. The average removal rate of SS, COD, NH3 - N, turbidity, bacterium, Fe and Mn is 100% （0 mg/L）, 94.5% （16.3 mg/L）, 98.3% （0.65 mg/L）, 99.7% （0.06 NTU）, 6-1g （4 CFU/mL）,99% （0.2 mg/L）, 92.3% （0.033 mg/L） respectively, and the effluent quality meets the standard of the Reuse of Urban Recycling Water--Water Quality Standard for Urban Miscellaneous Water Consumption（GB/T 18920 -2002）. The MBR has a strong ability in resisting loading shock. DO and sludge cake thickening are major influencing factors on membrane fouling.