Natural organic matter separation by forward osmosis: Performance and mechanisms

文献类型： 外文期刊

第一作者： Wang, Lin

作者： Wang, Lin;Wu, Daoji;Wang, Lin;Wu, Daoji;Chen, Feiyong;Wang, Lin;Li, Tian;Chu, Huaqiang;Dong, Bingzhi;Zhang, Wanzhu;Huang, Weiwei

作者机构：

关键词： Forward osmosis; Surface water; Fouling; Internal concentration polarization; Interfacial energy

期刊名称：WATER RESEARCH （ 影响因子：11.236； 五年影响因子：11.547 ）

ISSN： 0043-1354

年卷期： 2021 年 191 卷

页码：

收录情况： SCI

摘要： The purification performance of a forward osmosis (FO) membrane on natural organic matter (NOM) contained in real surface water by was investigated systematically. FO could reject the natural dissolved organic matter (DOM) effectively with removal efficiencies of approximately 99.0%. When the natural water samples (e.g., raw surface water) had lower fouling tendencies, the active layer facing the draw solution (AL-facing-DS mode) provided a higher water flux than that in the alternative membrane orientation because the isoflux point occurred later in the process. It was found that the concentration of calcium ions had a more severe effect on decreasing the fouling flux of the FO membrane than that of the organic foulant. Furthermore, the concentrated feed solution had a more significant effect on the fouling flux decline of the natural DOM containing more small molecules than natural DOM containing more macromolecules. Additionally, the fouling that occurred in the AL-facing-DS orientation was compensated by the reduced internal concentration polarization (ICP) level based on the occurrence of the critical compensation point. It was also revealed that the permeation drag caused by the water flux and the chemical interactions induced by the feed solution pH and the calcium ion concentration played a significant role in the adsorption of small natural DOM molecules in the porous structure of the FO membrane. Based on the analysis of the interfacial free energies, the interactions between the natural DOM and the surface of the support layer dominated the initial fouling of the FO membrane, while subsequent fouling was controlled by the interaction between the approaching DOM molecules and the already adsorbed DOM. (C) 2021 Elsevier Ltd. All rights reserved.

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