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The mechanism of membrane fouling in membrane distillation process by organic compounds: XDLVO Theory

Authors： Wang Ke, Fan Hua, Hou Deyin, Wang Jun

Units： 1Key Laboratory of Poyang Lake Environment and Resource Utilization, Ministry of Education, School of Environmental and Chemical Engineering, NanChang 330031, Jiangxi, China;2 National Engineering Research Center of Industrial Wastewater Detoxication and Resource Recovery, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China

KeyWords： XDLVO Theory; membrane fouling; hydrophobic membrane; organic pollution；air gas membrane distillation

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2022,42(2):25-33

Abstract：

The XDLVO (Extended Derjagu-Landau-Verwey-Overbeek) theory was used to quantitatively analyse the membrane fouling behavior mechanism of different membranes including a commercial microporous hydrophobic membrane (PVDF membrane) and a super hydrophobic membrane (SH-PVDF membrane). The theory was applied to the membrane distillation (MD) process of treating high-salt wastewater containing organic pollutions accounting for humic acid (HA) and sodium alginate (SA). Then the theory was utilized to evaluate the effect of different interfacial interactions which consist of Lifshitz van der Waals (LW), electrostatic (EL) and acid-base (AB) on the membranes fouling, and the air gap membrane distillation (AGMD) experiments were conducted to verify the calculation results. The results indicated that LW and EL were positive, while AB was negative and played a dominant role in the three interfacial energies. Thus the total interfacial interaction energy was negative and expressed as an attraction effect, indicating that the organic pollutions would pollute the membranes to a certain extent. The degree of membrane fouling was related to the polarity of membrane and pollutants. The SH-PVDF membrane was more difficult to be polluted by both of the two pollutions, and for the same membrane, HA was more likely to cause membrane fouling than SA. Furthermore, the membrane fouling would be aggravated with the addition of Ca2+.The AGMD experiment results were consistent with the calculation which indicated the theory is instructive to the analysis of membrane fouling behavior of organic compounds in MD process.

Funds：

国家重点研发计划项目（2019YFE0122400）；国家自然科学基金面上项目（5198650）

AuthorIntro：

王可（1997-），女，黑龙江伊春人，硕士，主要从事膜蒸馏水处理方向研究.

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