聚酰胺复合纳滤膜去除水中PFOS的研究

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Abstract In this study, PFOS removal was investigated by using polyamide nanofiltration membrane. The effects of PFOS concentration, ionic types, total ionic strength, and alginate on PFOS rejection were investigated through 12h filtration experiments with operation pressure of 0.6MPa. The results showed that PFOS rejection increased with the increase of PFOS concentration as well as total ionic strength. After 12h filtration, PFOS rejection under the total ionic strength of 150mmol/L was 2.1% higher than that of 10mmol/L.Specifically, compared with that of 1mmol/L Na⁺ existing condition, PFOS rejection was larger when 1mmol/L Ca²⁺ existed. Moreover, PFOS rejection increased with the enlargement of divalent ionic strength. After 12h filtration, PFOS rejection was about 97.5% when 3mmol/L Ca²⁺ existed in feed solution, which was greater than 95% of 1mmol/L Ca²⁺ condition.Besides, the existence of alginate resulted in the significant improvement of PFOS rejection, and the removal rate could still reach up to 95% after 12h filtration when calcium ions coexisted. However, alginate could also cause membrane fouling which led to the decline of membrane flux.

Key words： nanofiltration membrane PFOS retention alginate

Received: 12 June 2017

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	Articles by authors
	XU Chang-qing
	WANG Lei
	WANG Jia-xuan
	ZHI Rui

Cite this article:

XU Chang-qing,WANG Lei,WANG Jia-xuan等. Removal of PFOS in water by polyamide composite nanofiltration membrane[J]. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(1): 186-192.

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http://manu36.magtech.com.cn/Jweb_zghjkx/EN/ OR http://manu36.magtech.com.cn/Jweb_zghjkx/EN/Y2018/V38/I1/186

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