Influence of Operating Conditions on the Separation Performance of Forward Osmosis

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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.

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	Articles by authors
	Zhang Mengke
	Wang Yue
	Liu Yanqiu
	Xiao Qinqin
	Xu Shichang

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

Received 2016-04-27;

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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,V35(6): 32-40

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