Analysis of dissolved organic compounds in steel wastewater and fouling behavior of reverse osmosis membrane

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Abstract Various dissolved organic matters (DOM) in the feed water of reverse osmosis system leads to serious membrane fouling in the advanced treatment of steel wastewater. They were separated into four types of water samples using macroporous adsorption resin, which contained hydrophobic bases (HOB), hydrophobic acids (HOA), hydrophobic neutrals (HON) and hydrophilic substances (HIS), respectively. DOM composition of each water sample and membrane fouling behavior were investigated. The content of HIS is the highest, and content of HON is the lowest. The hydrophobic DOM contain more aromatic rings or conjugated structures than HIS. The aromatization degree of HOA is higher than that of HOB and HON. HON is prone to be adsorbed on the membrane surface due to their hydrophobic interaction, leading to membrane fouling. HON led to the highest flux decline and lowest flux recovery rate after hydrocleaning of the fouled membrane. HIS led to second-highest flux decline after HON, because its highest content and hydrogen-bond interaction with membrane surface promote membrane fouling, while the hydraulic shear force on membrane surface helps to reduce the thickness and resistance of fouling layer. Therefore, HON and HIS played a dominant role in membrane fouling caused by DOM. The effective removal of HON and HIS could be intensified by optimizing the pre-treatment of feed water of reverse osmosis system, which could cut down the membrane fouling.

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	CUI Yangli
	SUN Huifang
	HE Zhanchao
	ZHENG Lijun
	HU Xin
	LI Jianfeng
	XU Zhaozan

Keywords： steel wastewater dissolved organic matter resin separation reverse osmosis membrane fouling

Received 2022-08-21;

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Corresponding Authors: 许召赞,副教授,E-mail:zhaozanxu@sxu.edu.cn。 Email: zhaozanxu@sxu.edu.cn

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CUI Yangli, SUN Huifang, HE Zhanchao, ZHENG Lijun, HU Xin, LI Jianfeng, XU Zhaozan.Analysis of dissolved organic compounds in steel wastewater and fouling behavior of reverse osmosis membrane[J] Chemcial Industry and Engineering, 2023,V40(3): 63-73

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