Zhang K, Farahbakhsh K
School of Engineering, University of Guelph, Guelph, Ont., Canada N1G 2W1.
Water Res. 2007 Jun;41(12):2816-24. doi: 10.1016/j.watres.2007.03.010. Epub 2007 Apr 20.
The efficacy of a conventional activated sludge wastewater treatment process and the membrane bioreactor technology in removing microbial pathogens was investigated. Total and fecal coliforms and somatic and F-specific coliphages were used as indicators of pathogenic bacteria and viruses. Up to 5.7 logs removal of coliforms and 5.5 logs of coliphages were observed in the conventional treatment process with advanced tertiary treatment. Addition of chemical coagulants seemed to improve the efficacy of primary and secondary treatment for microorganism removal. Complete removal of fecal coliforms and up to 5.8 logs removal of coliphages was observed in the MBR system. It was shown that the MBR system was capable of high removal of coliphages despite the variation in feed coliphage concentrations. The results of this study indicated that the MBR system can achieve better microbial removal in far fewer steps than the conventional activated sludge process with advanced tertiary treatment. The final effluent from either treatment processes can be potentially reused.
研究了传统活性污泥废水处理工艺和膜生物反应器技术在去除微生物病原体方面的效果。总大肠菌群、粪大肠菌群以及体细胞噬菌体和F特异性噬菌体被用作病原菌和病毒的指标。在采用深度三级处理的传统处理工艺中，观察到大肠菌群去除率高达5.7个对数级，噬菌体去除率为5.5个对数级。添加化学凝聚剂似乎能提高一级和二级处理去除微生物的效果。在膜生物反应器系统中观察到粪大肠菌群被完全去除，噬菌体去除率高达5.8个对数级。结果表明，尽管进水噬菌体浓度存在变化，但膜生物反应器系统仍能高效去除噬菌体。本研究结果表明，与采用深度三级处理的传统活性污泥工艺相比，膜生物反应器系统能够以少得多的步骤实现更好的微生物去除效果。两种处理工艺的最终出水都有潜在的回用价值。
