地表水强化混凝超滤处理系统研究

Study on Surface Water Treatment by Enhanced Coagulation Combined with Ultrafiltration Membrane System

研究常规混凝及强化混凝与超滤联用处理模拟地表水,对比处理效果。利用三维荧光光谱和紫外可见光谱等研究处理过程中水体光谱特征,评价该系统对水质及后续处理的影响。结果表明,强化混凝-超滤联用系统对水体荧光强度、紫外吸收产生重要影响。能有效削弱峰值Ex/Em分别在220~230 nm/350 nm(Ⅱ区)、215 nm/400 nm(Ⅲ区)和275 nm/350 nm(Ⅳ区)的荧光,标准化分区荧光体积积分显示其对类酪氨酸、类色氨酸、类蛋白等各区荧光都有较强的削弱效果。强化混凝-超滤膜联用系统明显降低紫外吸收。混凝处理对紫外吸收的去除作用主要集中在216 nm、254 nm和280 nm等波长附近;超滤膜对紫外吸收的去除作用主要集中在216 nm和272 nm 2个波长附近,表明其对水体有机物有选择性截留能力,对消毒副产物形成能力的控制可能产生重要的影响。强化混凝-超滤系统大幅降低了微细颗粒物、有机物在超滤膜上的累积量,对膜污染控制具有明显意义。

ynthetic surface water was treated by using system of coagulation （CUM） and enhanced coagulation combined with ultrafiltration membrane （ECUM）. Effects of above treatment were compared. Spectrum characteristics of water samples during the treatment process were investigated by using three-dimention excitation / emission matrices （3D-EEM） and ultraviolet absorbance, in order to evaluate influences of the combined process on water quality and subsequant treatments. Results showed that siguificant effects of ECUM on the fluorescence intensities and ultraviolet absorbance of water samples were discerned. Removals oftyrosine-like, tryptophan-like, protein-like components were improved significantly after enhanced coagulation, which would be beneficial to control downstream membrane pollution. ECUM markedly reduced peaks of fluorescenee intensity at （E~/Ea） 220-230 nm/350 nm（II）, 215 nm/400 nm （III）and 275 nm/350 am（W） respectively. Removals of ultraviolet absorbance by coagulation were mainly focused on about 216 nm, 254 nm and 280 am. Removals ofultravi01et absorbanee by ultrafiltration in ECUM were mainly focused on about 216 nm and 272 am, which indicated that the system had selective interception ability of aqueous organic matter. It might have important effects on organic matter removal and the control of DBPs formation. The amount of fine particulate matter and organic matter accumulated on the ultrafiltration membrane were decreased by the system, which would have significant effects on the control of membrane fouling.