通过分子量深入了解废水再生中造成反渗透膜污垢的关键成分

IF 10.4 1区 工程技术 Q1 ENGINEERING, CHEMICAL
Yuan Bai, Yinhu Wu, Ziwei Zhang, Yu Mao, Ruining Wang, Xin Tong, Song Xue, Haobin Wang, Hongying Hu
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引用次数: 0

摘要

有机物的分子量(MW)是影响膜污垢倾向的重要因素之一。这项研究通过分子量分馏确定了再生水中反渗透膜的关键污垢物。在二级出水(SE)中,MW > 10 kDa 成分被确定为关键污垢贡献者(CFC),它仅占溶解有机碳(DOC)的 13 ± 5%,但却导致了 86 ± 11% 的通量下降。在为期 12 个月的监测中,SE 和 MW > 10 kDa 成分显示出相似的污垢变化趋势:冬季污垢潜势明显较高,夏季较低,而 MW < 10 kDa 成分污垢变化较小。被 CFC 污染的膜的形态特征是膜表面有一层光滑而厚的污垢层。CFC 主要由蛋白质和多糖组成,膜表面优先形成蛋白质-多糖-蛋白质的 "三明治 "污垢层结构。扩展的 Derjaguin-Landau-Verwey-Overbeek (xDLVO) 分析表明,CFC 与膜表面之间的强吸引力相互作用主导了污垢过程。此外,计算流体动力学(CFD)模拟显示,氟氯化碳具有很强的过滤阻力,这证实了它具有很大的污垢潜力。包括吸引力相互作用和有利的脊谷表面外观在内的双重效应解释了 MW > 10 kDa 成分的显著污垢倾向,并为实际应用中再生水的反渗透污垢机理提供了宝贵的见解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Molecular weight insight into critical component contributing to reverse osmosis membrane fouling in wastewater reclamation

Molecular weight insight into critical component contributing to reverse osmosis membrane fouling in wastewater reclamation

Molecular weight insight into critical component contributing to reverse osmosis membrane fouling in wastewater reclamation
Molecular weight (MW) of organics was one of the important factors influencing membrane fouling propensity. This study identified critical foulants of reverse osmosis (RO) membranes in reclaimed water by MW fractionation. MW > 10 kDa component was identified as the critical fouling contributor (CFC) in secondary effluent (SE), which accounted for only 13 ± 5% of dissolved organic carbon (DOC) but contributed to 86 ± 11% of flux decline. Throughout 12-month monitoring, SE and MW > 10 kDa component showed a similar fouling variation tendency: apparently higher fouling potential in winter and lower in summer, while MW < 10 kDa component presented minor fouling changes. Morphology of membrane fouled by CFC characterized a smooth and thick foulant layer on membrane surface. CFC was mainly composed of proteins and polysaccharides, and a protein-polysaccharide-protein “sandwich” fouling layer structure was preferentially formed on membrane surface. extended Derjaguin–Landau-Verwey–Overbeek (xDLVO) analysis demonstrated that strong attractive interactions between CFC and membrane surface dominated the fouling process. Furthermore, computational fluid dynamics (CFD) simulation revealed strong filtration resistance of CFC, confirming its significant fouling potential. Dual effects including attractive interactions and advantageous ridge-and-valley surface appearance accounted for the significant fouling propensity of MW > 10 kDa component and glean valuable insights into RO fouling mechanisms of reclaimed water in practical application.
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来源期刊
npj Clean Water
npj Clean Water Environmental Science-Water Science and Technology
CiteScore
15.30
自引率
2.60%
发文量
61
审稿时长
5 weeks
期刊介绍: npj Clean Water publishes high-quality papers that report cutting-edge science, technology, applications, policies, and societal issues contributing to a more sustainable supply of clean water. The journal's publications may also support and accelerate the achievement of Sustainable Development Goal 6, which focuses on clean water and sanitation.
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