污泥龄对复合式膜生物反应器运行特性的影响

摘要

在不同污泥龄(SRT)条件下同时运行5套复合式膜生物反应器(HMBR)处理生活污水,进行实验室小试,研究了SRT对HMBR运行特性的影响.试验结果表明,SRT对有机物和营养物质的去除有重要影响,COD、NH3-N、TN和TP平均去除率最高时对应的SRT分别为30、20、30、20 d.此外,过长和过短的SRT均会加剧膜污染,最佳SRT为30 d,对应的膜组件运行周期为117 d.%Pilot scale experiments have been conducted for treating domestic sewage by means of operating 5 sets of hybrid membrane bioreactors(HMBR)simultaneously,at different sludge retention times(SRT),and the influenc-es of SRT on the operational characteristics of HMBR researched. The results show that SRT has important influ-ences on the removal of organic substances and nutrients. When the average removing rates of COD ,NH3-N,TN and TP are the highest,the corresponding SRT are 30 d,20 d,30 d and 20 d respectively. In addition,too long or too short SRT can deteriorate membrane fouling. The optimal SRT is 30 d and the corresponding operational cy-cle of the membrane module is 117 d.