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    Impact of bromide and iodide during drinking water disinfection and potential treatment processes for their removal or mitigation

    226782_158310_Water2014V041N08_038.pdf (10.11Mb)
    Access Status
    Open access
    Authors
    Gruchlik, Yolanta
    Tan, J
    Allard, Sebastian
    Heitz, Anna
    Bowman, M.
    Halliwell, D.
    Gunten, U.
    Criquet, Justine
    Joll, Cynthia
    Date
    2014
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Gruchlik, Y. and Tan, J. and Allard, S. and Heitz, A. and Bowman, M. and Halliwell, D. and Gunten, U. et al. 2014. Impact of bromide and iodide during drinking water disinfection and potential treatment processes for their removal or mitigation. Water. 41 (8): pp. 38-43.
    Source Title
    Water
    Additional URLs
    http://digitaledition.awa.asn.au/?iid=107971&startpage=page0000040#folio=40
    ISSN
    0310-0367
    School
    Curtin Water Quality Research Centre
    Remarks

    This research was supported by the Australian Research Council Funding scheme ARC LP100100285

    URI
    http://hdl.handle.net/20.500.11937/10764
    Collection
    • Curtin Research Publications
    Abstract

    In this study, the impact of bromide and iodide on disinfected waters was examined and potential treatment technologies for their removal or mitigation were investigated. Distributed waters from two Western Australian drinking water sources were evaluated in terms of their bromide and iodide concentrations, disinfection by-product (DBP) formation, halogen-specific adsorbable organic halogen (AOX) formation and chlorinous odours after disinfection. In both systems, the brominated DBPs dominated the measured DBPs and, in both cases, the known DSPs accounted for only 30% of total organohalogens. Chloramination with a sufficient free chlorine contact time followed by ammonia addition, rather than preformed monochloramine, may be a viable mitigation strategy for the minimisation of I-OBPs, since exposure to free chlorine should promote the conversion of iodide to iodate, a safe form of iodine. This study has shown that bromide plays an important role in this process, mainly by enhancing the preferred conversion' of iodide to iodate. Ozone pre-treatment selectively oxidised iodide to iodate and minimised the formation of I-OB Ps. Complete conversion of iodide to iodate, while minimising the bromate formation to below the guideline value of 10 µg L-1 was achieved for a wide range of ozone concentrations in raw waters, including raw waters with high bromide concentrations.

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    • Influence of bromide on iodate and iodo-trihalomethane formation during chlorination of iodide-containing waters
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    • Ozonation of iodide-containing waters: Selective oxidation of iodide to iodate with simultaneous minimization of bromate and I-THMs.
      Allard, Sebastien; Nottle, C.; Chan, W.; Joll, Cynthia; Von Gunten, Urs (2013)
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    • Toxicity evaluation of synthetic waters based on Br-Cl-I-THMs formation during the chlorine/ammonia process
      Allard, Sebastian; Tan, J.; Charrois, Jeffrey; Joll, C.; Heitz, A.; Von Gunten, Urs (2014)
      Monochloramine (NH2Cl) is commonly used as an alternative to chlorine for disinfection because it is less reactive with the organic matrix, therefore forms less regulated DBPs and leads to a more stable residual. However, ...
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