State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China.
State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
Water Res. 2014 Mar 15;51:277-83. doi: 10.1016/j.watres.2013.10.069. Epub 2013 Nov 7.
One of the critical issues for the widely application of ultrafiltration (UF) in water treatment is membrane fouling owning to the dissolved organic matter. The aim of the present study is to explore the effect of various particle sizes caused by low dosages of coagulant with dissolved organic matter on the UF membrane performance. Aluminum chloride was added to the synthetic water with the hydrophobic humic acid (HA), the hydrophilic bovine serum albumin (BSA) - a protein- and their 1:1 (mass ratio) mixture. The results showed that there was a critical dose of Al that could cause dramatic flux reduction by blocking the membrane pores after coagulating with HA/BSA. For HA or BSA, the critical dose of Al was relatively lower at pH 6.0 than that at pH 8.0. After coagulation, the flux decline caused by HA was slightly varied as a function of pH while that caused by BSA was greatly affected by pH. The flux decline caused by the 1:1 (mass ratio) HA/BSA mixture after coagulation was similar to that caused by HA after coagulation because BSA could be encapsulated by HA. In addition, the peak value of the molecular weight (MW) distribution of HA coagulated with Al was changed more drastically compared to that of BSA after filtration.
在水处理中广泛应用超滤（UF）的一个关键问题是由于溶解的有机物而导致的膜污染。本研究的目的是探索低剂量的混凝剂与溶解的有机物因不同粒径对 UF 膜性能的影响。在含有疏水性腐殖酸（HA）、亲水性牛血清白蛋白（BSA）——一种蛋白质和它们 1:1（质量比）混合物的合成水中添加了氯化铝。结果表明，存在一个临界剂量的 Al，在与 HA/BSA 混凝后，可以通过堵塞膜孔导致通量急剧下降。对于 HA 或 BSA，在 pH 6.0 时的临界 Al 剂量比在 pH 8.0 时要低。混凝后，HA 引起的通量下降随 pH 值略有变化，而 BSA 引起的通量下降则受 pH 值的影响很大。混凝后 1:1（质量比）HA/BSA 混合物引起的通量下降与混凝后 HA 引起的通量下降相似，因为 BSA 可以被 HA 包裹。此外，与过滤后 BSA 相比，Al 混凝的 HA 的分子量（MW）分布的峰值变化更为剧烈。
