厌氧/缺氧/好氧膜生物反应器处理城市污水效能研究

采用厌氧/缺氧/好氧膜生物反应器对北京某城市污水处理厂的初沉池出水进行中试试验,约200 d的研究表明,在水力停留时间保持12.5 h后,化学需氧量、生物需氧量及总有机碳的去除率分别稳定在92%、98%、85%左右,其中生化降解部分与膜过滤部分对COD去除的贡献率分别为89%和11%;NH4+-N、总氮(total nitrogen,TN)的去除率分别为98%、79%左右,出水ρ(TN)平均在10 mg/L左右;系统在污泥龄为40 d左右时,总磷(totalphosphorus,TP)平均去除率为85%,出水ρ(TP)在0.93 mg/L左右;反硝化除磷、好氧吸磷、膜截留对总磷的去除所占的比例分别为44.6%、51.8%、3.6%;出水浊度极低且几乎无悬浮物,可直接回用于城市杂用水.间歇抽吸、曝气冲刷、在线水力反冲及定期药洗保证了该系统的可持续运行.

Effectiveness of Wastewater Treatment Using an Anaerobic/Anoxic/Aerobic-membrane Bioreactor

A pilot-scale anaerobic/anoxic/aerobic-membrane bioreactor was utilized to treat wastewater from the primary sedimentation tank in a municipal wastewater treatment plant in Beijing.After about 200 days of experimental study,it shows good removal efficiency of chemical oxygen demand(COD),biological oxygen demand(BOD),and total organic carbon(TOC),which reaches stably 92%,98%,and 85%,respectively at the hydraulic retention time(HRT) of 12.5 h.Contribution of COD removal by biodegradation and microfiltration is 89% and 11%,respectively.The removal efficiency of NH+4-N,and total nitrogen(TN) is about 98%,85%,with on average ρ(TN) of permeate 10 mg/L.The removal efficiency of TP is about 85%,with ρ(TP) of permeate about 0.93 mg/L at the sludge age of 40 days.The proportions of TP removal by denitrifying phosphorus removal,the aerobic phosphorus uptake,and membrane cut-off is 44.6%,51.8%,3.6%,respectively.The permeation of extreme low turbidity and almost non-SS can be reclaimed for the urban miscellaneous water consumption.Intermittent suction,scouring aeration,on-line hydraulic backwash,and regular drug-wash as a mean of inhibiting membrane fouling,ensures the sustainable running of the whole system.