浸没式超滤膜中试装置直接处理北江水的研究

为了探讨短流程绿色水处理工艺的适用性,开展了浸没式超滤膜中试装置直接处理北江水的研究。考察了超滤膜通量和连续过滤时间两种工况条件对中试装置去除CODMn、UV254、浊度、氨氮和亚硝酸盐氮的影响,并分析了它们对膜污染(跨膜压差和荧光性有机物)的影响。结果表明:浸没式超滤膜中试装置处理北江水连续运行69 d过程中,出水CODMn和浊度指标均满足《生活饮用水卫生标准》(GB 5749-2006),但对原水中的氨氮和亚硝酸盐氮基本没有去除效果;增加超滤膜通量和延长连续过滤时间都会显著削弱CODMn和UV254去除效果,但对浊度的去除率始终保持在99%以上,这归因于超滤膜强大的筛滤作用。中试装置的跨膜压差随着超滤膜通量的增加和连续过滤时间的延长呈现恶化趋势,表明超滤膜污染程度加剧。

Treatment of Beijiang River Water by Submerged Ultrafiltration Membrane Pilot Plant

The Beijiang River water was treated by a submerged ultrafiltration membrane pilot plant in order to evaluate the applicability of environmental short-cut water treatment technology.The effects of ultrafiltration membrane flux and continuous filtration time on the removal of CODMn,UV254,turbidity,ammonia nitrogen and nitrite nitrogen in the pilot plant were investigated,and the effects on membrane fouling(transmembrane pressure and fluorescent organics)were analyzed.CODMn and turbidity in the effluent both met the Standards for Drinking Water Quality(GB 5749-2006)during 69 days of continuous operation of the pilot plant.However,there was almost no removal of ammonia nitrogen and nitrite nitrogen.Increasing ultrafiltration membrane flux and prolonging continuous filtration time could significantly reduce the CODMn and UV254 removal efficiencies.However,the removal efficiency of turbidity was always above 99%,which was due to the strong sieving effect of ultrafiltration membrane.The transmembrane pressure of the pilot plant showed a deteriorating trend with the increase of ultrafiltration membrane flux and continuous filtration time,indicating that the ultrafiltration membrane fouling degree was aggravated.