Fulvic and alginic acid separation during pressure retarded osmosis: Governing effects and fouling mechanisms

文献类型： 外文期刊

第一作者： Wang, Lin

作者： Wang, Lin;Lu, Xiaozhen;Guo, Ning;Cheng, Xiaoxiang;Jin, Yan;Zhang, Lijie;Zhao, Lu;Zhang, Juan;Wu, Daoji;Wang, Lin;Guo, Ning;Cheng, Xiaoxiang;Jin, Yan;Zhang, Lijie;Wu, Daoji;Chen, Feiyong;Liu, Junxia;Huang, Weiwei;Chu, Huaqiang;Dong, Bingzhi

作者机构：

关键词： Pressure retarded osmosis (PRO); Fouling; Fulvic acid; Alginate; XDLVO theory; Pearson correlation coefficient

期刊名称：SEPARATION AND PURIFICATION TECHNOLOGY （ 影响因子：8.6； 五年影响因子：7.8 ）

ISSN： 1383-5866

年卷期： 2023 年 306 卷

页码：

收录情况： SCI

摘要： In this study, the performance of model foulant (alginate and fulvic acid) separation by pressure retarded osmosis (PRO) was systematically studied. At the various operating conditions tested, fulvic acid had a greater flux decline and power density loss than alginate. The results of membrane resistance test, SEM-EDX images, and the solute diffusion coefficient K demonstrated that fulvic acid was more likely to clog the inside of the porous support layer of the PRO membrane, which would exacerbate the internal concentration polarization (ICP) phenomena. Although model foulants were successfully removed by PRO (with a retention rate of about 95.0%), the presence of either calcium or magnesium ions was detrimental to the fouling process of PRO membranes. According to the XDLVO theory analysis results, the presence of calcium or magnesium ions increased foulant adhesion to the PRO membrane, thereby resulting in membrane fouling. In addition, Pearson correlation coefficient also showed that the hydrodynamic conditions (effective osmotic pressure difference as well as operating hydraulic pressure acting vertically to the membrane and parallel to the membrane cross-flow shear force) had an important effect on the degree of membrane fouling. This is attributed to the influence of the hydrodynamic conditions on the initial influence water flux and thus on the fouling of the PRO membrane.

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