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    Evidence of soluble microbial products accelerating chloramine decay in nitrifying bulk water samples

    Access Status
    Fulltext not available
    Authors
    Bal Krishna, K
    Sathasivan, Arumugam
    Sarker, Dipok
    Date
    2012
    Type
    Journal Article
    
    Metadata
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    Citation
    Bal Krishna, K and Sathasivan, Arumugam and Sarker, Dipok. 2012. Evidence of soluble microbial products accelerating chloramine decay in nitrifying bulk water samples. Water Research 46 (13): pp. 3977-3988.
    Source Title
    Water Research
    DOI
    10.1016/j.watres.2012.05.026
    ISSN
    0043-1354
    URI
    http://hdl.handle.net/20.500.11937/17768
    Collection
    • Curtin Research Publications
    Abstract

    The discovery of a microbially derived soluble product that accelerates chloramine decay is described. Nitrifying bacteria are believed to be wholly responsible for rapid chloramine loss in drinking water systems. However, a recent investigation showed that an unidentified soluble agent significantly accelerated chloramine decay. The agent was suspected to be either natural organic matter (NOM) or soluble microbial products (SMPs). A laboratory scale reactor was fed chloraminated reverse osmosis (RO) treated water to eliminate the interference from NOM. Once nitrification had set in, experiments were conducted on the reactor and feed waters to determine the identity of the component. The study showed the presence of SMPs released by microbes in severely nitrified waters. Further experiments proved that the SMPs significantly accelerated chloramine decay, probably through catalytic reaction. Moreover, application of common protein denaturing techniques stopped the reaction implying that the compound responsible was likely to be a protein. This significant finding will pave the way for better control of chloramine in the distribution systems.

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