膜科学与技术

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Study on the operational resistance and pollution of PTFE and PVDF hollow fiber composite membranes in submerged filtration systems of drinking water plants

Authors： ZHANG Zuoqun，SU Gongjian, GAO Yang, ZHENG xiang, and XUE Lixin

Units： 1. Center for Membrane Separation and Water Science & Technology, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, 310014, China; 2. Ningbo Water and Environmental Service Groups, LLC, Ningbo Waterworks Construction Co., Ltd, Ningbo, 315084, China; 3. College of Environmental Sciences, People‘s University of China, Beijing, 100872 , China

KeyWords： ultrafiltration; polytetrafluoroethylene; polyvinylidenefluoride; membrane resistance; membrane fouling

ClassificationCode：TU991.2；X522

year,volume(issue):pagination： 2023,43(4):99-109

Abstract：

Ultrafiltration membranes of various materials have been widely used in major water purification plants. Operating parameters such as trans-membrane pressure difference and membrane flux vary significantly with different membrane pollution and clean methods. The water permeating resistance and fouling performance of polyvinylidene fluoride (PVDF) and polytetrafluoroethylene (PTFE) composite hollow fiber composite membranes in the submerged filtration systems of water purification plants were compared. The purpose is to provide some reference for the long-term stable operation of the ultrafiltration system in the water plant. The results show that PTFE composite membrane showed not only better durance in chemical cleaning, but also lower resistance during operation. PTFE composite membrane showed average water flux of 54.07 L/(m2h), 1.4-1.5 times higher water flux than those of PVDF composite membrane and with greatly reduced water permeating resistance components. It was found that the major performance deterioration of PTFE composite membrane came from the deposition of inorganic pollutants with high valence cations of Fe and Al, and metal-organic complexes on the membrane surface, while the deterioration of PVDF membrane was mainly caused by the inorganic colloids and organic macro-molecules accumulated on the membrane surfaces and adsorbed in the pores. For PTFE membranes, hydro-chloric acid and citric acid solution showed good cleaning effect for the pollutants on the membrane surface. Through coordination and complexation, the organic-metal complexes could be simultaneously stripped off the membrane surface while cleaning metal deposits. Used PVDF membranes could not be effectively cleaned by single cleaning agent from citric acid, hydro-chloric acid, or sodium hydroxide solution.

Funds：

国家自然科学基金联合基金重点项目（U1809213），国家自然科学基金面上项目(NSFC-21975222）

AuthorIntro：

张祚群（1996-），男，硕士研究生，江西上饶人，研究方向为膜水处理技术。E-mail：707219208@qq.com

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