Study of DOM removal in surface water by forward osmosis
WEI Yong1, WU Hong1, LI Tian2, LUO Zheng-bo1, LI Xian-jian1, WEI Qin-zheng1
1. School of Environment and Safety Engineering & School of Urban Construction, Changzhou University, Changzhou 213164, China; 2. College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
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.
魏永, 吴宏, 李甜, 罗政博, 李贤建, 魏勤政. 正渗透去除地表水中DOM的效能研究[J]. 中国环境科学, 2022, 42(7): 3204-3211.
WEI Yong, WU Hong, LI Tian, LUO Zheng-bo, LI Xian-jian, WEI Qin-zheng. Study of DOM removal in surface water by forward osmosis. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(7): 3204-3211.
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