正渗透去除地表水中DOM的效能研究

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Abstract Forward osmosis (FO) filtration was carried out with influent from Ge Lake after sand filtration, and draw solution of sodium chloride. Different factors influencing FO performance were examined and the cleaning process of the fouled membrane was also conducted to investigate the reversibility of the FO membrane fouling. The results showed that increasing the concentration of the draw solution or the operation temperature and membrane surface velocity could enhance the permeate flux. In addition, the FO could effectively remove the main four types of dissolved organic matters (DOM) in Ge Lake, i.e. the soluble microbial metabolites, tryptophan-like substances, fulvic acids and humic acids, with DOC and UV₂₅₄removal ratios both above 96%. Furthermore, the membrane cleaning performance exhibited that the flux of the fouled membrane in a short-term filtration can be almost fully recovered with just hydraulic washing, while that in a long-term filtration couldn’t be generally recovered with hydraulic washing, but with ultrasonic cleaning. Finally, the membrane elution was analyzed and it was found that the tryptophan-like substances and fulvic acids were key membrane fouling contributors.

Key words： forward osmosis surface water dissolved organic matter membrane fouling membrane cleaning

Received: 29 December 2021

PACS:

X522

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	Articles by authors
	WEI Yong
	WU Hong
	LI Tian
	LUO Zheng-bo
	LI Xian-jian
	WEI Qin-zheng

Cite this article:

WEI Yong,WU Hong,LI Tian等. Study of DOM removal in surface water by forward osmosis[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(7): 3204-3211.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I7/3204

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