Modification of NF membrane properties by in situ redox initiated graft polymerization with hydrophilic monomers

S. Belfer, R. Fainshtain, Y. Purinson, J. Gilron, M. Nyström, M. Mänttäri

    Research output: Contribution to journalArticlepeer-review

    86 Scopus citations

    Abstract

    Nanofiltration membranes used for treating wastewater streams can be modified to change their adsorption and solute rejection properties and their susceptibility to fouling. NF200 membranes modified by hydrophilic monomer such as PEGMA showed greatly reduced adsorption of certain organic compounds typical of paper mill streams. Further testing of these membranes and NF270 in flat sheet and spiral element form showed indications that the modification gave modest increases in resistance to fouling by acid clear filtrate from paper mills. In tests on tertiary effluent from wastewater treatment plants, modification of NF membranes (NF70, NF270) by HEMA lead to significantly reduced salt passage, especially of monovalent anions (chloride). The effects of modification on solute retention were much more pronounced on the tertiary effluent. These effects can be partly explained in terms of the relative role of ordered water and secondary membranes formed by deposits on the membrane.

    Original languageEnglish
    Pages (from-to)55-64
    Number of pages10
    JournalJournal of Membrane Science
    Volume239
    Issue number1
    DOIs
    StatePublished - 1 Aug 2004

    Keywords

    • Fouling
    • In situ modification
    • Nanofiltration
    • Water treatment

    ASJC Scopus subject areas

    • Biochemistry
    • Materials Science (all)
    • Physical and Theoretical Chemistry
    • Filtration and Separation

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