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    Combined BAC and MIEX pre-treatment of secondary wastewater effluent to reduce fouling of nanofiltration membranes

    Access Status
    Fulltext not available
    Authors
    Aryal, Ashok
    Sathasivan, Arumugam
    Heitz, Anna
    Gang, Z.
    Nikraz, Hamid
    Ginige, M.
    Date
    2015
    Type
    Journal Article
    
    Metadata
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    Citation
    Aryal, A. and Sathasivan, A. and Heitz, A. and Gang, Z. and Nikraz, H. and Ginige, M. 2015. Combined BAC and MIEX pre-treatment of secondary wastewater effluent to reduce fouling of nanofiltration membranes. Water Research. 70: pp. 214-223.
    Source Title
    Water Research
    DOI
    10.1016/j.watres.2014.12.003
    Additional URLs
    http://www.sciencedirect.com/science/article/pii/S0043135414008355
    ISSN
    0043-1354
    School
    Department of Civil Engineering
    URI
    http://hdl.handle.net/20.500.11937/11810
    Collection
    • Curtin Research Publications
    Abstract

    Biological activated carbon (BAC) and magnetic ion exchange resin (MIEX) were used to pre-treat secondary wastewater effluent (SWWE) and assessed for their capacity to reduce fouling of a nanofiltration membrane. BAC pre-treated water facilitated a lower but a steady flux while MIEX treated water resulted in a higher but a rapidly declining flux. Their combined use increased average flux from 58 to 89%. MIEX combined with BAC, in that order, was superior in reducing membrane fouling. Measurement of average Stokes radius (m) and apparent molecular weight distribution of dissolved organic matter (DOM), by nuclear magnetic resonance (NMR) and liquid chromatography organic carbon detection (LC-OCD), respectively, revealed that the microbial activity of BAC changed the nature of organic matter, probably by increasing the size of DOM molecules. BAC generally decreased the lower apparent molecular weight (LMW) fraction of dissolved organic carbon (DOC). Hence, the removal of LMW DOC and an increase of average Stokes radius (m) of DOM appeared to be important in facilitating a longer steady flux. Specifically, the combined MIEX/BAC pre-treatments appeared to target and reduce the foulants in SWWE that are largely responsible for the reduction of flux in nanofiltration membranes.

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