NOM的亲疏水性及分子质量分布对超滤膜污染的影响  

Effects of Hydrophilicity/Hydrophobicity and Molecular Weight Distribution of Natural Organic Matters on Ultrafiltration Membrane Fouling

作　　者：李旭辉[1] 于水利[1,2] 赵晴[1] 衣雪松[1] 孙彦斌 阎春芳 

机构地区：[1]哈尔滨工业大学城市水资源与水环境国家重点实验室,黑龙江哈尔滨150090 [2]同济大学污染控制与资源化研究国家重点实验室,上海200092 [3]大连市自来水集团有限公司,辽宁大连116001

出　　处：《中国给水排水》2010年第17期31-34,39,共5页China Water & Wastewater

基　　金：国家自然科学基金资助项目(50778050;50978068);国家高技术研究发展计划(863)项目(2008AA06Z304);国家科技支撑计划重点项目(2006BAJ08B09)

摘　　要：采用XAD-8/XAD-4型树脂将松花江水中的有机物分离出强疏水性、弱疏水性和亲水性三种有机组分,分别研究了其对PVDF超滤膜和改性PVDF超滤膜的污染性能。分别过滤强疏水、弱疏水和亲水性有机组分时,PVDF原膜的比通量分别为60.6%、70.8%和82.0%,而改性PVDF膜的比通量为75.1%、77.6%和86.0%。表明有机物的疏水性越强则对膜的污染能力越大;而膜的污染程度与对有机物的去除率并非呈正相关。此外,还研究了不同组分有机物的分子质量分布对膜污染的影响。结果表明,与分子质量相对较大的亲水性天然有机物相比,分子质量相对较小的疏水性天然有机物产生的膜污染较重。XAD-8/XAD-4 resins were used to isolate organic matters in the Songhua River water into strongly hydrophobic, weakly hydrophobie and hydrophilic fractions, and the effects of the three fractions on fouling of polyvinylidene fluoride （PVDF） and modified PVDF ultrafiltration membranes were investigated. When the three fractions are filtrated, the specific fluxes of PVDF membrane are 60.6% , 70.8% and 82.0% respectively, while the specific fluxes of modified PVDF membrane are 75. 1% , 77.6% and 86.0% respectively, indicating that the more hydrophobic the organic matters are, the more serious the membrane fouling is. The extent of membrane fouling has no positive correlation to the removal rate of organic matters. In addition, the effect of molecular weight distribution of organic matters with different constituents on membrane fouling was investigated. The results show that compared to hydrophilic natural organic matters with higher molecular weight, hydrophobic natural organic matters with lowermolecular weight lead to more serious membrane fouling.

关 键 词：超滤 膜污染 天然有机物 亲疏水性 分子质量分布 

分 类 号：TU991.21[建筑科学—市政工程]