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Use of a spacer to mitigate concentration polarization during forward osmosis process

Authors： CHENG Shiying，ZHANG Hanmin*., 1, YANG Fenglin

Units： Key Laboratory of Industrial Ecology and Environmental Engineering (MOE),

KeyWords： Forward osmosis; internal concentration polarization; spacer location

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2015,35(1):49-55

Abstract：

A major barrier to use asymmetric membranes for forward osmosis (FO) process is concentration polarization (CP) which dramatically reduces the real performance of FO. The scope of this study was to provide a simple method of mitigating CP, especially dilutive internal CP, in the absence of additional energy consumption and investigate the impact of spacer location on concentrative external CP and dilutive internal CP which occurred in FO (AL-FW) mode; finally we tried to provide a spacer location that could significantly decrease the adverse effect of CP on FO performance. These findings of the research led the author to the conclusion that in FO mode, placing the spacer in the draw channel with one end connecting the membrane could well mitigate dilutive ICP. Under such conditions when the feed solution was 0.5M NaCl while the draw solution was 1M, 2M and 4M NaCl separately, the average water flux could increase by 2.94 %, 9.0 % and 12.5 % respectively. Besides, placing the spacer in both feed (away from the membrane) and draw channels (in contact with the membrane) could be an acceptable method of decreasing the negative effects of concentrative ECP and dilutive ICP simultaneously.

Funds：

国家自然科学基金项目(51278079)

AuthorIntro：

张捍民(1973-)，女，教授，博士，博士生导师，研究方向为水污染控制、膜法水处理等，(电话)0411-84706173 (电子邮箱)zhanghm@dlut.edu.cn],

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