Membrane Science and Technology

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Progress of characterization research on concentration polarization and membrane fouling of forward osmosis

Authors： Xue Niantao, Pan Tao*

Units： National Engineering Research Center of Urban Environmental Pollution Control, Beijing Municipal Research Institute of Environmental Protection, Beijing 100037, the PR China

KeyWords： forward osmosis; concentration polarization; membrane fouling; progress

ClassificationCode：X703.1

year,volume(issue):pagination： 2015, 35(5):109-113

Abstract：

Forward osmosis (FO), a novel membrane separation technology with low energy consumption and high water recovery, has been drawn attention around the world. Its driving force for separation is natural pressure difference existing between the feed solution and draw solution. Concentration polarization and membrane fouling are two main factors resulting in decrease in water flux. Increase in cross-flow velocity would significantly reduce negative influence of external concentration polarization on FO performance. Internal concentration polarization could only be reduced through improvement on membrane structure and membrane performance. Membrane fouling is one of the technical barriers of FO. Mechanism of membrane fouling includes adsorption on membrane surface and cake layer (gel layer) formation. Membrane foulants include dissolved inorganic matter, colloid and suspended matter, organic matter, and microorganisms. Properties of FO membrane and feed solution, membrane orientation, and operating conditions are the affecting factors of membrane fouling. The methods for fouling control include pretreatment, hydraulic methods, cleaning, and modification of membrane structure, etc. Research on mechanisms of membrane fouling and its control methods can promote the development and application of FO technology.

Funds：

北京市环境保护科学研究院科技基金（2014-A-08），“水体污染控制与治理”重大专项（2012ZX07203-001-01）

AuthorIntro：

第一作者简介：薛念涛（1969-），男，山东沂南人，博士，高级工程师，从事污水、固废、生物脱臭研究，xueniantao@163.com. *通讯作者，pantao@cee.cn

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