浸没式MBR油脂污染离线清洗方法和经济性研究

Study on Off‑line Cleaning Method and Economy of Grease Pollution in Immersed Membrane Bioreactor

某地下污水处理厂采用AAO+MBR处理工艺,针对该污水厂频繁离线洗膜以及洗膜后跨膜压差短期内快速升高的问题,首先对膜污染物类型和膜结构进行了表征分析,着重研究了油脂污染膜丝的离线清洗方法,发现先用柠檬酸+十六烷基三甲基溴化铵(CTAB)浸泡,然后用NaClO+CTAB浸泡效果最佳,并分析了该离线膜清洗方法的经济效益。

An underground sewage treatment plant adopts AAO and MBR treatment process.Aiming at the problem of frequent off‑line membrane washing and the rapid rise of transmembrane pressure after membrane washing,the pollutant types and membrane structure are characterized and analyzed firstly,focusing on the off‑line cleaning method of grease contaminated membrane filaments.It is found that the soaking effect of citric acid and cetyltrimethyl ammonium bromide(CTAB)before NaClO and CTAB is the best,and the economic benefits are analyzed for the off‑line membrane washing method.