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    Effect of IX dosing on polypropylene and PVDF membrane fouling control

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    Type
    Article
    Authors
    Myat, Darli Theint
    Mergen, Max R D
    Zhao, Oliver
    Stewart, Matthew B.
    Orbell, John D.
    Merle, Tony cc
    Croue, Jean-Philippe
    Gray, Stephen R.
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Environmental Science and Engineering Program
    Water Desalination and Reuse Research Center (WDRC)
    Date
    2013-07
    Permanent link to this record
    http://hdl.handle.net/10754/562836
    
    Metadata
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    Abstract
    The performance of ion exchange (IX) resin for organics removal from wastewater was assessed using advanced characterisation techniques for varying doses of IX. Organic characterisation using liquid chromatography with a photodiode array (PDA) and fluorescence spectroscopy (Method A), and UV254, organic carbon and organic nitrogen detectors (Method B), was undertaken on wastewater before and after magnetic IX treatment. Results showed partial removal of the biopolymer fraction at high IX doses. With increasing concentration of IX, evidence for nitrogen-containing compounds such as proteins and amino acids disappeared from the LC-OND chromatogram, complementary to the fluorescence response. A greater fluorescence response of tryptophan-like proteins (278nm/343nm) for low IX concentrations was consistent with aggregation of tryptophan-like compounds into larger aggregates, either by self-aggregation or with polysaccharides. Recycling of IX resin through multiple adsorption steps without regeneration maintained the high level of humics removal but there was no continued removal of biopolymer. Subsequent membrane filtration of the IX treated waters resulted in complex fouling trends. Filtration tests with either polypropylene (PP) or polyvinylidene fluoride (PVDF) membranes showed higher rates of initial fouling following treatment with high IX doses (10mL/L) compared to filtration of untreated water, while treatment with lower IX doses resulted in decreased fouling rates relative to the untreated water. However, at longer filtration times the rate of fouling of IX treated waters was lower than untreated water and the relative fouling rates corresponded to the amount of biopolymer material in the feed. It was proposed that the mode of fouling changed from pore constriction during the initial filtration period to filter cake build up at longer filtration times. The organic composition strongly influenced the rate of fouling during the initial filtration period due to competitive adsorption processes, while at longer filtration times the rate of fouling appeared to depend upon the amount of biopolymer material in the feed water. © 2013.
    Citation
    Myat, D. T., Mergen, M., Zhao, O., Stewart, M. B., Orbell, J. D., Merle, T., … Gray, S. (2013). Effect of IX dosing on polypropylene and PVDF membrane fouling control. Water Research, 47(11), 3827–3834. doi:10.1016/j.watres.2013.03.056
    Sponsors
    The authors are grateful to the ARC and Orica for financial support of this project (Australian Postgraduate Award-Industry: LP0989554). The authors would like to thank the Melbourne Water for providing water samples, Orica Watercare for providing MIEX (TM) resin and Siemens Water Technologies for providing membrane fibres used in this study.
    Publisher
    Elsevier BV
    Journal
    Water Research
    DOI
    10.1016/j.watres.2013.03.056
    PubMed ID
    23648287
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.watres.2013.03.056
    Scopus Count
    Collections
    Articles; Biological and Environmental Sciences and Engineering (BESE) Division; Environmental Science and Engineering Program; Water Desalination and Reuse Research Center (WDRC)

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