Optimization of novel composite membranes for water and mineral recovery by vacuum membrane distillation

Zhaoliang Cui*, Yongxing Zhang, Xue Li, Xiaozu Wang, Enrico Drioli, Zhaohui Wang, Shuaifei Zhao

*Corresponding author for this work

    Research output: Contribution to journalArticle

    19 Citations (Scopus)

    Abstract

    In mining industries, the process combining ultrafiltration (UF) and reverse osmosis (RO) is often used for wastewater treatment, but RO brine discharge is a big issue. Membrane distillation (MD) has been proposed to solve this problem by significantly increasing the water recovery ratio, and recovering minerals. However, membranes with high hydrophobicity targeting for MD, particularly for vacuum membrane distillation (VMD) are still scarce. Hyflon AD is a novel candidate for fabricating membranes for MD. In this paper, the effects of membrane fabrication parameters, such as coating time, heat treatment and pre-filling were investigated and optimized. Membrane morphology, mechanical properties and VMD performance of the composite membranes were tested. The results showed that the hydrophobicity and elongation at break of the membrane were significantly improved after coating. The coating polymer concentration, coating time, heat treatment temperature and heat treatment time for the membrane coated by Hyflon AD40L and Hyflon AD40H, respectively were optimized. Monovalent alcohols can be excellent pre-filling agents to improve membrane performance. Separation performance of the membrane coated by Hyflon AD40H was better than that of the one coated by Hyflon AD40L.

    Original languageEnglish
    Pages (from-to)39-47
    Number of pages9
    JournalDesalination
    Volume440
    Early online date6 Dec 2017
    DOIs
    Publication statusPublished - 15 Aug 2018

    Keywords

    • Hyflon AD
    • Membrane coating
    • Membrane distillation
    • Poly(vinylidene fluoride) membrane
    • Vacuum membrane distillation

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