Influence of membrane surface properties on initial rate of colloidal fouling of reverse osmosis and nanofiltration membranes
Influence of membrane surface properties on initial rate of colloidal fouling of reverse osmosis and nanofiltration membranes
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DOI：
10.1016/s0376-7388(01)00376-3
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发表时间：
2001-06-30
影响因子：
9.5
通讯作者：
Elimelech, M
中科院分区：
文献类型：
--
作者：
Vrijenhoek, EM;Hong, S;Elimelech, M
最近的研究表明，膜表面形态和结构影响反渗透 (RO) 和纳滤 (NF) 膜的渗透性、截留率和胶体污染行为。本研究试图确定控制 RO/NF 膜胶体污染率最有影响力的膜特性。对四种芳香族聚酰胺薄膜复合膜的物理表面形貌、表面化学性质、表面zeta电位和比表面化学结构进行了表征，在实验室规模的错流过滤装置中获得的膜污染数据与测量的膜表面性质相关，结果表明RO和NF膜的胶体污染与膜表面粗糙度几乎完全相关，无论物理和化学性质如何 操作条件。进一步证明，污染膜的原子力显微镜 (AFM) 图像具有重要价值：深入了解胶体污染的机制。在污染的初始阶段，AFM 图像清楚地显示，粗糙膜上沉积的颗粒多于光滑膜上的颗粒。颗粒优先积聚在粗糙膜的“谷”中，导致“谷堵塞”，从而导致比光滑膜更严重的 Aux 下降。 (C) 2001 Elsevier Science B.V，保留所有权利。
Recent studies have shown that membrane surface morphology and structure influence permeability, rejection, and colloidal fouling behavior of reverse osmosis (RO) and nanofiltration (NF) membranes. This investigation attempts to identify the most influential membrane properties governing colloidal fouling rate of RO/NF membranes. Four aromatic polyamide thin-film composite membranes were characterized for physical surface morphology, surface chemical properties, surface zeta potential, and specific surface chemical structure, Membrane fouling data obtained in a laboratory-scale crossflow filtration unit were correlated to the measured membrane surface properties, Results show that colloidal fouling of RO and NF membranes is nearly perfectly correlated with membrane surface roughness, regardless of physical and chemical operating conditions. it is further demonstrated that atomic force microscope (AFM) images of fouled membranes yield valuable: insights into the mechanisms governing colloidal fouling, At the initial stages of fouling, AFM images clearly show that more particles are deposited on rough membranes than on smooth membranes. Particles preferentially accumulate in the "valleys" of rough membranes, resulting in "valley clogging" which causes more severe Aux decline than in smooth membranes. (C) 2001 Elsevier Science B.V, All rights reserved.