膜生物反应器净化微污染原水的试验研究

Membrane Bioreactor for Treatment of Micro-polluted River Water

以某微污染河网水为原水，考察了膜生物反应器／粉末活性炭（MBR／PAC）工艺对其处理的效果和运行特性，并与超滤工艺进行比较。膜组件采用聚乙烯中空纤维超滤膜，膜孔径为0．2λm，面积为2m^2；组合工艺的活性炭和污泥浓度分别为0．5、2g/L；通过时间控制器控制出水泵间歇运行，开／停时间比为8min/2min。结果表明：与超滤工艺相比，MBR／PAC工艺对CODMn、C、UV254、UV410等有机污染指标的去除效果显著提高，其中对UV410的去除率为85％～100％，对CODMn、TOC、UV254的去除率均可达50％以上，出水CODMn满足生活饮用水卫生标准。对氨氮、铁和浊度的去除率分别超过80％、87％和90％，出水值分别低于0．5mg／L、0．1mg／L和0．5NTU，满足《生活饮用水卫生标准》（GB5749-2006）的要求。

The treatment of micro-polluted river water by membrane bioreactor （MBR） combined with powdered activated carbon （PAC）adsorption was studied. The pollutant removal performance was compared with that of the uhrafihration （UF） process. The pore size and area of polyethylene hollow fiber ultrafihration membrane were O. 2 μm and 2 m^2 respectively. The activated carbon and sludge concentrations of MBR/PAC process were 0.5 and 2 g/L respectively. Time controller was used to operate the water pump intermittently, and the open/stop time ratio was 8 min/2 min. The results show that the removal efficiencies of CODMn, TOC, UV254 and UV410 are much higher in MBR/PAC than those in UF. In the MBR/PAC process, 85% to 100% of UV410 and more than 50% of CODMn, TOG and UV254 can be removed. CODMn concentration in the effluent meets the national drinking water standard. The removal rates of ammonia nitrogen, Fe and turbidity are above 80%, 87% and 90% respectively, and their effluent concentrations are below 0.5 mg/L, 0.1 mg/L and 0.5 NTU respectively, satisfying the Standards for Drinking Water Quality （ GB 5749 - 2006 ）.