载体生物与超滤耦合工艺去除应急备用水源水污染物的研究

Study on Removal of Pollutants from Emergency Source Water by Coupling Carrier Biology and Ultrafiltration

珠江西航道水源水是广州的应急备用水源,水源受污染程度日益加剧,主要污染物是氨氮、有机物、藻类。超滤工艺可以有效去除水体的浊度及水中的藻类,载体生物工艺可有效去除水中的氨氮和有机物。本研究建立了载体生物与超滤耦合工艺,并考察其对微污染水源水中浊度、有机物、氨氮和藻类的去除效果。试验结果表明,在工艺运行停留时间为1.5 h、气水比为2.5:1;浸没式中空纤维超滤膜反冲洗时间为5 min,反洗水量为1.2 m^(3)/h,反冲洗气量为6 m^(3)/h的运行条件下,对氨氮和CODMn的去除率分别可以达到94%、39%,出水氨氮小于0.5 mg/L、CODMn小于3 mg/L;浊度去除率均可达99.50%以上,出水浊度均低于0.02 NTU,均满足国家生活饮用水卫生标准。

The source water of the west Channel of the Pearl River is the emergency backup water source of Guangzhou.The pollution degree of the source water is increasing day by day.The main pollutants are ammonia nitrogen,organic matter and algae.Ultrafiltration process can effectively remove turbidity and algae,carrier biological process can effectively remove ammonia nitrogen and organic matter in water.In this study,the coupling process of carrier biology and ultrafiltration was established,and its removal effect on turbidity,organic matter,ammonia nitrogen and algae in micro-polluted source water was investigated.The test results show that the process residence time is 1.5 h and the gas-water ratio is 2.5:1.Under the operating conditions of 5min backwashing time,1.2 m^(3)/h backwashing waterand 6 m^(3)/h backwashing gas,the removal rates of ammonia nitrogen and CODMn can reach 94%and 39%,respectively.The effluent ammonia nitrogen is less than 0.5 mg/L and CODMn is less than 3 mg/L.Turbidity removal rate can reach more than 99.50%,effluent turbidity is lower than 0.02 NTU,all meet the national drinking water sanitation standards.