Understanding the oxidative cleaning of UF membranes

Inna Levitsky, Aviv Duek, Elizabeth Arkhangelsky, Diana Pinchev, Tali Kadoshian, Hila Shetrit, Ronen Naim, Vitaly Gitis

    Research output: Contribution to journalArticlepeer-review

    76 Scopus citations

    Abstract

    Increased protein fouling of polyether sulphone membranes after NaOCl cleaning was previously reported but not explained. Here we show that the cleaning increases the hydrophilicity, and the degree of increase linearly correlates with the amount of adsorbed protein. The high initial flux through the cleaned membrane is a result of the hydrophilization of the membrane surface and a promise for the enhanced fouling. We propose that the proper oxidative cleaning should target the restoration of the initial flux and not its increase over initial values. The previously reported pore size changes are subjective as higher hydrophilicity of the membrane surface increases water permeability and adsorption of size test solutes.

    Original languageEnglish
    Pages (from-to)206-213
    Number of pages8
    JournalJournal of Membrane Science
    Volume377
    Issue number1-2
    DOIs
    StatePublished - 15 Jul 2011

    Keywords

    • BSA
    • Free chlorine
    • PEG
    • PES
    • PVDF

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