UAFB-缺氧-好氧MBR组合工艺处理生活污水效能研究

Development of a Novel Hybrid UAFB-Anoxic-Aerobic MBR for Energy Production and Nutrients Removal from Domestic Wastewater

为了同时达到从生活污水中回收能源性气体和深度处理生活污水的目的,试验采用升流式厌氧污泥固定床(up-flowanaerobic fixed bed,UAFB)-缺氧-好氧膜生物反应(membrane bioreactor,MBR)组合工艺处理生活污水.试验重点研究了组合工艺对生活污水的处理效能,包括能源性气体的产生效能、对污染物质的处理效能以及对污泥浓度的控制.UAFB-缺氧-好氧MBR组合工艺在温度20℃、厌氧HRT为3 h、缺氧HRT为3 h、好氧HRT为3.5 h的条件下运行,甲烷气体的产生量为1.55L/d,COD去除率为93.28%,NH 4+-N去除率为90.60%,UAFB出水VFAs总量54.74 mg/L,TN去除率为45.51%.试验发现,组合工艺可以长期维持反应器内较低的污泥浓度,大大减小了剩余污泥的处理量,在一定程度上实现了污泥减量化,同时较低的污泥浓度有利于缓解膜污染.

The combined treatment process making up of up-flow anaerobic sludge fixed bed（UAFB）,anoxic tank and aerobic membrane bioreactor（MBR） was used to treat domestic wastewater.And the ability of reclaiming methane and reusing wastewater was investigated.The efficiency of the combined treatment process treating wastewater at optimized parameters was studied in this paper.The combined treatment process treating domestic wastewater run at optimized parameters（20℃,HRT were 3 h,3 h,3.5 h） indicated that,the anaerobic gas production was 1.55 L/d,the COD and NH 4＋-N removal efficiency were 93.28% and 90.60% respectively,UAFB effluent including 54.74 mg/L of total VFAs,corresponding NO 3--N accumulating rate was 45.19% and TN removal efficiency was 45.51%.At the same time,it was found that sludge concentration of anoxic tank and aerobic MBR could be maintained at a low level,which is so rich in significance for sludge reduction and delaying membrane fouling.