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Impact of pretreatment on the wetting resistance of hydrophobic PVDF membranes in vacuum membrane distillation

Authors： ZHAO xiaodan, LV xiaolong, ZHENG shuyun, LIU zhiyu

Units： 1State Key Laboratory of Separation Membranes and Membrane Processes, School of Environment and Chemical Engineering, Tiangong University, Tianjin 300387, P. R. China； 2Huadian Water Equipment(Tianjin) Co., Ltd.No.10, Yuanjing Road, Wuqing District, Tianjin 301700, P. R. China；3State Key Laboratory of Membrane Materials and Membrane Applications，Tianjin Motimo Membrane Technology Co.,Ltd.No. 60 11th Street, Tianjin Economic and Technological Development Area.300457, P. R. China

KeyWords： Key words: membrane distillation; hydrophobic membrane; wetting; surfactant; flocculation

ClassificationCode：TS102.528.1；TQ028

year,volume(issue):pagination： 2024,44(1):96-101

Abstract：

Hydrophilic leakage is one of the key bottlenecks faced by the application of hydrophobic membrane technology, mainly due to the wetting effect of surface active substances in pollutants in water on hydrophobic membranes. This article proposes a pre-treatment process using flocculation enhanced gas-liquid extraction to remove surface active substances from the original solution, in order to slow down the wetting process of hydrophobic membranes. This article uses sodium dodecylbenzenesulfonate to simulate negatively charged surface active substances such as humic acid in representative water bodies. A vacuum membrane distillation wetting experiment is conducted using a polyvinylidene fluoride hollow fiber hydrophobic membrane to explore the effects of pretreatment methods, the charge, type, and dosage of flocculants during the pretreatment process on the hydrophilic leakage of hydrophobic membrane materials. The results show that the pre-treatment process of flocculation enhanced gas-liquid extraction can effectively remove surface active substances from the raw material liquid; The pre-treatment effect of cationic flocculants is better than that of anionic flocculants; The pre-treatment effect of organic flocculants is better than that of inorganic flocculants; When the amount of cationic polyacrylamide added is 12 mg/L, the removal rate of the surfactant sodium dodecylbenzenesulfonate is 17% higher than that without flocculation pretreatment.

Funds：

国家重点研发计划项目（2023YFB3810504）；天津市高等学校新型膜材料及膜分离技术创新团队项目（TD13-5044）

AuthorIntro：

赵晓丹（1993—），女，黑龙江黑河人，硕士，主要研究方向为膜法水处理技术，E-mail：963009795@qq.com

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