无机结垢对纳滤膜分离水中全氟化合物的影响

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Abstract Perfluorooctane sulfonate (PFOS) and perfluorobutane sulfonate (PFBS) which have different chain lengths were selected as the target polyfluoroalkyl substances (PFASs). Gypsum was chosen as the typical inorganic scaling. The characteristics and related mechanisms of PFASs removal by nanofiltration membrane in different gypsum scaling stages were studied. The tests were referred to as gypsum test. At the same time, the non-scaling inorganic salt solution with the same ionic strength was used to carry out a comparative test to investigate the retention rule of the target PFASs. The results showed that when gypsum coexisted with target PFASs, PFOS steady-state rejection of gypsum scaling experiment (>97.1%) displayed a higher retention than that of comparison experiment (<93.0%). While the steady-state removal rate of PFBS of comparison experiment (46.2%) was greater than that of gypsum scaling experiment (38.2%). For the same PFAS, the membrane surface charge of gypsum scaling experiment was less than that of the comparison test at the same filtration moment. Comprehensive analysis based on the combination of rejection rate, membrane flux and zeta potential showed that in the processing of gypsum scaling, the interception of PFOS was mainly controlled by the complexation and bridging of Ca²⁺ and PFOS, which affected the steric hindrance intensity of PFOS separation. At the initial stage of filtration, electrostatic repulsion played a major role in PFBS retention. When the scaling layer had formed, the cake enhanced concentration polarization effect became the main reason for the decrease of PFBS rejection.

Key words： polyfluoroalkyl substances polypiperazine amide composite nanofiltration membrane gypsum membrane fouling rejection mechanism

Received: 07 June 2022

PACS:

X703.5

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	Articles by authors
	WANG Jia-xuan
	SUN Pei-dong
	LIU Zhe
	HOU Yu-shi
	GUO Jun-jiang
	LI Kun
	WANG Lei

Cite this article:

WANG Jia-xuan,SUN Pei-dong,LIU Zhe等. Effects of inorganic scaling on the separation of polyfluoroalkyl substances from water by nanofiltration membrane[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(1): 174-180.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I1/174

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