中空纤维和多通道超滤膜的尸检研究，来自用于地表水深度处理的中试规模超高回收率过滤系统。
An autopsy study of hollow fiber and multibore ultrafiltration membranes from a pilot-scale ultra high-recovery filtration system for surface water treatment.
机构信息
Department of Environmental Engineering, College of Art, Culture, and Engineering, Kangwon National University, 1 Kangwondaehak-gil, Chuncheon-si, Gangwon-do 24341, Republic of Korea.
Department of Integrated Energy and Infrasystem, Kangwon National University, Kangwondaehak-gil, 1, Chuncheon-si, Gangwon-do 24341, Republic of Korea.
出版信息
Sci Total Environ. 2023 Mar 25;866:161311. doi: 10.1016/j.scitotenv.2022.161311. Epub 2023 Jan 2.
The organic fouling characteristics of hollow fiber ultrafiltration (HFUF) and multibore ultrafiltration (MBUF) membranes from long-term ultrafiltration (UF) membrane systems were systemically investigated in this study. The objective was to obtain insights into the fouling behavior of dissolved organic matter (DOM) in a pilot-scale ultra-high-recovery membrane filtration system (p-UHMS) used for surface water treatment. The pilot system consisted of a series of two different UF membranes (1st stage: polyvinylidene fluoride (PVDF) HFUF and 2nd stage: polyethersulfone (PES) MBUF). It was designed to feed the HFUF concentrate to the MBUF membranes to achieve ≥99.5 % total water recovery for surface water treatment, as these advances might enhance the production efficiencies of drinking water. The experimental results confirmed that hydrophobic DOM controlled the formation of HFUF membrane organic fouling, whereas hydrophilic DOM, including polysaccharide-like and protein-like matter, promoted MBUF membrane fouling. These opposing trends were attributed to the hydrophilic characteristics of the MBUF membrane surfaces (contact angle: PVDF = 90-130° and PES ≤ 80°), which reduced the hydrophobic interactions between the UF membrane surfaces and foulants. The performance declines of the MBUF membrane due to fouling layer formation was considerably severer than those of the HFUF membrane, decreasing total permeate water in the p-UHMS. Moreover, the quantity of the desorbed MBUF membrane foulants via 0.1 N NaOH was roughly 7.2 times larger than that of the desorbed HFUF membrane foulants through 0.1 N NaOH, indicating that alkaline-based cleaning agent could much more efficiently recover the performance of the fouled MBUF membranes. Hence, adequate cleaning strategies using alkaline-based agent for the MBUF membrane appeared to be essential for preventing the performance deterioration of the p-UHMS.
本研究系统地研究了长期超滤（UF）膜系统中中空纤维超滤（HFUF）和多通道超滤（MBUF）膜的有机污染特性。目的是深入了解在用于地表水处理的中试超高回收率膜过滤系统（p-UHMS）中溶解有机物（DOM）的污染行为。该中试系统由一系列两种不同的 UF 膜（第一级：聚偏二氟乙烯（PVDF）HFUF 和第二级：聚醚砜（PES）MBUF）组成。设计将 HFUF 浓缩物进料到 MBUF 膜中，以实现地表水处理的≥99.5%总水回收率，因为这些进步可能会提高饮用水的生产效率。实验结果证实，疏水性 DOM 控制了 HFUF 膜有机污染的形成，而亲水性 DOM，包括多糖类和蛋白质类物质，则促进了 MBUF 膜的污染。这些相反的趋势归因于 MBUF 膜表面的亲水性特征（接触角：PVDF=90-130°，PES≤80°），这减少了 UF 膜表面和污染物之间的疏水相互作用。由于污染层的形成，MBUF 膜性能下降的严重程度明显大于 HFUF 膜，导致 p-UHMS 中的总渗透水量减少。此外，通过 0.1N NaOH 解吸的 MBUF 膜污染物的量大约是通过 0.1N NaOH 解吸的 HFUF 膜污染物的 7.2 倍，表明碱性清洁剂可以更有效地恢复污染的 MBUF 膜的性能。因此，对于 MBUF 膜，采用碱性清洁剂的适当清洗策略似乎对于防止 p-UHMS 性能恶化至关重要。
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