MIEX/超滤一体化工艺净化长江原水的研究

水体中的天然有机物是造成超滤膜污染的重要因素。考察了磁性离子交换树脂(MIEX)/超滤膜一体化净水工艺处理长江原水的效果,并通过与超滤膜直接过滤进行比较,探讨了MIEX预处理对去除有机物的影响及控制膜污染的效果。结果表明,与原水直接进行超滤处理相比,组合工艺对CODMn、DOC、UV254的去除率分别提高了40.70%、38.20%和43.90%。MIEX/超滤工艺控制消毒副产物的优势更为明显,对THMFP和HAAFP的去除率分别达62.54%和55.83%。由于MIEX预处理去除了原水中56.72%的疏水性有机物,降低了超滤膜的负荷,延缓了膜表面致密凝胶层的形成,因而减少了膜孔堵塞,可有效控制运行压力的增长速度,延长过滤时间。

Combined Process of MIEX and Ultrafiltration Membrane for Purification of Yangtze River Raw Water

Natural organic matter (NOM) is an important factor resulting in membrane fouling.The purification effect of Yangtze River raw water by the combined process of magnetic ion exchange (MIEX) and uhrafihration was investigated.The effect of MIEX pretreatment on the removal of organics and the control of membrane fouling was studied by comparing with the process of direct uhrafihration.The results show that the removal rates of COD_(Mn),, DOC, UV_(254) in the combined process are increased by 40.70%, 38.20% and 43.90% compared with the direct uhrafihration.The removal of disinfection by-products can be enhanced by the MIEX pretreatment process especially, and the removal rates of THMFP and HAAFP reach 62.54% and 55.83% respectively.Because 56.72% of hydrophobic organics is re-moved by MIEX process, the load of the membrane is reduced, and the forming of dense gel layer is de-layed, thus preventing the pore from blocking, controlling the increase of operation pressure and prolon-ging the filtration cycle.