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Analysis of membrane parameters for forward osmosis membrane based on the nonequilibrium thermodynamics

Authors： BIAN Li-xia, FANG Yan-yan, WANG Xiao-lin

Units： Beijing Key Laboratory of Membrane Materials and Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China

KeyWords： nonequilibrium thermodynamics; forward osmosis membrane; membrane parameter; transport phenomenon; osmotic pressure driven membrane process

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2016,36(4):75-83

Abstract：

Transport phenomena of a forward osmosis membrane in both hydraulic and osmotic pressure driven membrane processes were analyzed by three independent membrane parameters based on nonequilibrium thermodynamics. To examine the uniformity of these parameters in membrane processes operated by different driving forces, we determined the membrane parameters of the same membrane active layer using independent methods. First, the membrane parameters were determined from rejection data of several neutral solutes in hydraulic pressure driven mode experiments. Second, the water volumetric flux and solute molar flux of the same neutral draw solutes were investigated in osmotic pressure driven mode experiments. The membrane parameters for these solutes were obtained based on the flux data and the nonequilibrium thermodynamic model. The results revealed good agreement between the two methods and contribute to further understanding the transport phenomenon in FO process and its difference from hydraulic pressure driven membrane processes.

Funds：

国家高技术研究发展计划（863）项目（批准号：2012AA03A604）

AuthorIntro：

第一作者简介：边丽霞（1986-），女，河北人，硕士研究生，主要研究方向为正渗透膜过程传质和动电现象，E-mail: blxlydia@126.com *通讯作者E-mail：xl-wang@tsinghua.edu.cn.

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