AAOA/MBR工艺处理城市污水的试验研究

Anaerobic-Anoxic-Oxic-Anoxic and MBR Process for Treatment of Municipal Wastewater

在对传统A2/O工艺进行改良的基础上,将之与膜分离技术相结合,提出了一个新的污水处理工艺———AAOA/MBR,并对该工艺处理城市污水的除污效能进行了研究。结果表明,AAOA/MBR工艺具有很强的抗冲击负荷能力,除出水TP值因进水浓度波动大、碳源不足而不能稳定达到《城镇污水处理厂污染物排放标准》(GB 18918—2002)的一级A标准外,其他指标均优于一级A标准;缺氧Ⅱ单元的设置及采取多点进水方式,可提高对污水中固有碳源的有效利用、增强系统的脱氮效能,实现出水TN低于7 mg/L。用MBR膜过滤单元代替传统的沉淀池,可强化系统对污染物的去除效能。

The traditional A2/O process was modified and a new wastewater treatment process, called the combined process of anaerobic-anoxic-oxic-anoxic （AAOA） and membrane bioreactor （MBR） , was developed by combining the modified A2/O process with membrane separation technology. The efficiency of the combined process for treating municipal wastewater was investigated. The results in- dicated that the combined process had good shock load resistance, and the effluent quality surpassed the first level A criteria specified in the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant （GB 18918- 2002） except TP due to large fluctuation in influent concentration and shortage of carbon source. The second anoxic unit and step feeding could improve the effective utilization of the car- bon inherent in wastewater and enhance the removal of nitrogen. The concentration of the total nitrogen in the effluent was less than 7 mg/L. The adoption of MBR instead of the traditional sedimentation tank could improve the pollutant removal efficiency of the combined process.