操作条件对正渗透分离性能的影响

摘要正渗透是以渗透压差为驱动力的新型膜分离过程。采用水流分布较佳的膜池结构，研究了膜朝向、流动方式对正渗透水通量性能的影响，结果表明PRO模式（当膜的活性层朝向驱动液时）的水通量明显高于FO模式（当膜的活性层朝向原料液时），但其衰减程度较大；在溶液浓度差相同的条件下，逆流操作更利于水通量的提高。针对FO模式和逆流条件，探讨了溶液温度对水通量和反向盐通量的影响，结果表明：膜两侧溶液温度同步升高时，正渗透过程的水通量和反向盐通量均增加，且水通量的增加幅度大于反向盐通量；单侧增加溶液的温度时，驱动液侧温度升高对水通量性能的提升效果优于原料液侧。综合考虑过程能耗和系统性能，认为单独升高驱动液温度更具实用价值。

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	张梦轲
	王越
	刘艳秋
	肖芹芹
	徐世昌

关键词：正渗透；温度；水通量；反向盐通量

Abstract： Forward osmosis is a novel membrane separation technology driven by the osmotic pressure difference between the feed and draw solutions. In this paper, membrane orientation and flow pattern were first studied in a new-style membrane module with better flow distribution, the results showed that the water flux in PRO mode is obviously higher than that in FO mode, while the decay rate is much faster. And under the same concentration, counter-current pattern is more beneficial for the improvement of water flux. Under the conditions of FO mode and counter-current pattern, effects of solution temperatures on the water flux and reverse solute flux were explored. The results showed that when the temperatures of the feed and draw solutions increase synchronously, both the water flux and reverse solute flux of the FO module increased, and the increased amplitude of water flux is bigger than that of reverse salt flux. The effect of draw solution temperature on the improvement of water flux is more significant than that of feed solution when increasing the solution temperature unilaterally. Considering the energy consumption and the system performance, rising the draw solution temperature solely has a great practical value.

Keywords： forward osmosis； temperature； water flux； reverse solute flux

Received 2016-04-27;

Fund:天津市海洋经济创新发展区域示范项目（CXSF2014-10）。

Corresponding Authors: 王越,E-mail:tdwy75@tju.edu.cn Email: tdwy75@tju.edu.cn

About author: 张梦轲(1990-),女,硕士研究生,现从事正渗透水处理技术研究。

引用本文:

张梦轲, 王越, 刘艳秋, 肖芹芹, 徐世昌.操作条件对正渗透分离性能的影响[J]. 化学工业与工程, 2018,35(6): 32-40

Zhang Mengke, Wang Yue, Liu Yanqiu, Xiao Qinqin, Xu Shichang.Influence of Operating Conditions on the Separation Performance of Forward Osmosis[J]. Chemcial Industry and Engineering, 2018,35(6): 32-40

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