Effects of inorganic scaling on the separation of polyfluoroalkyl substances from water by nanofiltration membrane
WANG Jia-xuan1,2,3,4, SUN Pei-dong1, LIU Zhe5, HOU Yu-shi6, GUO Jun-jiang5, LI Kun1, WANG Lei4,5
1. School of Architecture and Civil Engineering, Xi'an University of Science and Technology, Xi'an 710054, China; 2. Post-doctoral Research Center of Mining Engineering, Xi'an University of Science and Technology, Xi'an 710054, China; 3. Ecology and Environment Bureau of Yulin, Yulin 719000, China; 4. Research Institute of Membrane Separation Technology of Shaanxi Province, Xi'an University of Architecture and Technology, Xi'an 710055, China; 5. School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China; 6. Shaanxi Architectural Design and Research Institute (Group) Co., Xi'an 710018, China
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.
王佳璇, 孙沛东, 刘喆, 侯语诗, 郭俊江, 李琨, 王磊. 无机结垢对纳滤膜分离水中全氟化合物的影响[J]. 中国环境科学, 2023, 43(1): 174-180.
WANG Jia-xuan, SUN Pei-dong, LIU Zhe, HOU Yu-shi, GUO Jun-jiang, LI Kun, WANG Lei. Effects of inorganic scaling on the separation of polyfluoroalkyl substances from water by nanofiltration membrane. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(1): 174-180.
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