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    Membrane fouling mechanism transition in relation to feed water composition

    Access Status
    Fulltext not available
    Authors
    Myat, D.
    Mergen, M.
    Zhao, O.
    Stewart, M.
    Orbell, J.
    Merle, T.
    Croue, Jean-Philippe
    Gray, S.
    Date
    2014
    Type
    Journal Article
    
    Metadata
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    Citation
    Myat, D. and Mergen, M. and Zhao, O. and Stewart, M. and Orbell, J. and Merle, T. and Croue, J. et al. 2014. Membrane fouling mechanism transition in relation to feed water composition. Journal of Membrane Science. 471: pp. 265-273.
    Source Title
    Journal of Membrane Science
    DOI
    10.1016/j.memsci.2014.07.067
    ISSN
    0376-7388
    School
    Curtin Water Quality Research Centre
    URI
    http://hdl.handle.net/20.500.11937/53779
    Collection
    • Curtin Research Publications
    Abstract

    The impact of secondary effluent wastewater from the Eastern Treatment Plant (ETP), Melbourne, Australia, before and after ion exchange (IX) treatment and polyaluminium chlorohydrate (PACl) coagulation, on hydrophobic polypropylene (PP) and hydrophilic polyvinylidene fluoride (PVDF) membrane fouling was studied. Laboratory fouling tests were operated over 3-5 days with regular, intermittent backwash. During the filtration with PP membranes, organic rejection data indicated that humic adsorption on hydrophobic PP membrane occurred during the first 24h of filtration and contributed to fouling for both raw wastewater and pre-treated wastewaters. However, after the first 24h of filtration the contribution of humic substances to fouling diminished and biopolymers that contribute to cake layer development became more prominent in their contribution to the fouling rate. For PVDF membranes, the per cent removal of humic substances from both raw wastewater and pre-treated wastewaters was very small as indicated by no change in UV254 from the feed to the permeate over the filtration period, even during the early stages of filtration. This suggested that the hydrophobic PP membrane adsorbed humic substances while the hydrophilic PVDF membrane did not. The highest mass of biopolymer removal by each PVDF membrane was from ETP water followed by PACl and IX treated water respectively. This was possibly due to differences in the backwashing efficiency linked to the filter cake contributed by biopolymers. Hydraulic backwashing was more effective during the later stages of filtration for the ETP water compared to IX and PACl treated waters, indicating that the filter cake contributed by ETP biopolymers was more extensively removed by hydraulic backwashing. It was proposed that humic substances may act to stabilise biopolymers in solution and that removing humics substances by coagulation or IX results in greater adhesive forces between the biopolymers and membrane/filter cake. Extended laboratory filtration is required to understand fouling of low pressure membranes as it relates to commercial applications, as the initial rate of fouling for new membranes can include pore constriction mechanisms from humic substances which diminish in significance as filtration continues. Filtration for >24h was required before the HIFI values became constant.

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