Laboratory of Environmental Toxicology, School of Biological Sciences, The University of Hong Kong, Pokfulam Road, Hong Kong SAR, Hong Kong, China.
J Hazard Mater. 2009 Dec 30;172(2-3):1093-9. doi: 10.1016/j.jhazmat.2009.07.101. Epub 2009 Aug 3.
Dissolved organic matter (DOM) influences many aspects of drinking water treatment, including the formation of harmful disinfection by-products (DBPs) when disinfectants are applied. DOM was isolated and fractionated using membrane ultra-filtration (UF) and reverse osmosis (RO) to eight individual fractions based on molecular weight cut-offs from a conventional surface water treatment plant (WTP) in Guangzhou of PR China. Molecular weights of these eight fractions were further calibrated using high performance size exclusion chromatography (HPSEC) and they ranged from 0.36 to 182.6 kDa. Fractions with molecular weight <0.80 kDa obtained by YC-05 UF membrane and RO were the major ones in all four stages of the water treatment processes; both ZM-500 and YM-100 membranes showed the highest removal efficiency when coupling with conventional coagulation and sedimentation processes. The elemental analysis showed that YC-05 fraction had greater polarity and aromaticity than any of the others. Furthermore, disinfection characteristics and trihalomethane formation potential (THMFP) were determined for all DOM fractions obtained in this study. YC-05 fraction was the major precursor for trihalomethane (THMs) formation among the samples tested and could be removed effectively by particulate activated carbon (PAC) adsorption. RO fraction could not be removed by PAC adsorption and, as a result, consumed more chlorine in the disinfection process. The results suggested that advanced drinking water treatment should focus on the removal of low molecular weight DOM in the source water.
溶解有机物（DOM）会影响饮用水处理的多个方面，包括在应用消毒剂时形成有害的消毒副产物（DBP）。DOM 采用膜超滤（UF）和反渗透（RO）进行分离和分级，根据中国广州常规地表水水厂（WTP）的分子量截止值将其分为 8 个单独的级分。这 8 个级分的分子量进一步使用高效体积排阻色谱法（HPSEC）进行校准，分子量范围为 0.36 至 182.6 kDa。通过 YC-05 UF 膜和 RO 获得的分子量<0.80 kDa 的级分是水处理过程四个阶段的主要级分；ZM-500 和 YM-100 膜在与常规混凝和沉淀工艺结合时显示出最高的去除效率。元素分析表明，YC-05 级分的极性和芳香性比其他任何级分都大。此外，还对本研究中获得的所有 DOM 级分进行了消毒特性和三卤甲烷生成潜能（THMFP）的测定。在测试的样品中，YC-05 级分是三卤甲烷（THMs）形成的主要前体，可以通过颗粒活性炭（PAC）吸附有效去除。RO 级分不能通过 PAC 吸附去除，因此在消毒过程中消耗更多的氯。结果表明，先进的饮用水处理应侧重于去除水源中的低分子量 DOM。
