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首页> 外文期刊>Separation and Purification Technology >Ultrafiltration of humic acid solutions through unmodified and surface functionalized low-fouling polyethersulfone membranes - Effects of feed properties, molecular weight cut-off and membrane chemistry on fouling behavior and cleanability
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Ultrafiltration of humic acid solutions through unmodified and surface functionalized low-fouling polyethersulfone membranes - Effects of feed properties, molecular weight cut-off and membrane chemistry on fouling behavior and cleanability

机译：通过未改性的和表面功能化的低污染聚醚砜膜对腐殖酸溶液进行超滤-进料性能，截留分子量和膜化学性质对结垢行为和清洁性的影响

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摘要

In the present work, polyethersulfone (PES) ultrafiltration (UF) membranes with molecular weight cut-off (MWCO) from 5 to 300 kDa were analyzed with respect to fouling during filtration of humic acid (HA) model solution. The impact of MWCO and prefiltration of the feed solution on the fouling behavior of these membranes is presented. Moreover, an UV-initiated graft copolymerization of poly(ethylene glycol) meth-acrylate (PEGMA) onto PES membranes was performed and the effect of the applied modification was examined in terms of MWCO and water permeability changes as well as performance during filtration of HA. Moreover, the fouling behavior and principles during the filtration were compared. Membranes with higher MWCO exhibited stronger flux decline during UF but better cleanability. Prefiltration through 0.45 μm filter improved the membrane performance during filtration of HA but the efficiency of physical cleaning was deteriorated. The applied modification improved the membrane performance during ultrafiltration and facilitated the physical cleaning. This work contributes to a better understanding of the relationships between membrane MWCO, solute size and size distribution, membrane surface chemistry and membrane fouling.
机译：在目前的工作中，针对腐殖酸（HA）模型溶液的过滤过程中的结垢情况，分析了分子量截留值（MWCO）为5至300 kDa的聚醚砜（PES）超滤（UF）膜。介绍了MWCO和进料溶液的预过滤对这些膜的结垢行为的影响。此外，进行了聚甲基丙烯酸乙二醇酯（PEGMA）在PES膜上的UV引发的接枝共聚反应，并根据MWCO和透水性的变化以及HA过滤过程中的性能检查了施加的改性效果。此外，比较了过滤过程中的结垢行为和原理。 MWCO较高的膜在超滤期间表现出更强的通量下降，但清洁性更好。通过0.45μm过滤器进行预过滤可改善HA过滤过程中的膜性能，但物理清洁效率会降低。所施加的改性改善了超滤过程中的膜性能，并促进了物理清洁。这项工作有助于更好地了解膜的MWCO，溶质尺寸和尺寸分布，膜表面化学性质和膜结垢之间的关系。

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