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    A new method for calculation of the chlorine demand of natural and treated waters

    Access Status
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    Authors
    Warton, Benjamin
    Heitz, Anna
    Joll, Cynthia
    Kagi, Robert
    Date
    2006
    Type
    Journal Article
    
    Metadata
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    Citation
    Warton, Benjamin and Heitz, Anna and Joll, Cynthia and Kagi, Robert. 2006. A new method for calculation of the chlorine demand of natural and treated waters. Water Research 40 (15): 2877-2884.
    Source Title
    Water Research
    DOI
    10.1016/j.watres.2006.05.020
    Faculty
    Department of Applied Chemistry
    Division of Engineering, Science and Computing
    Faculty of Science
    URI
    http://hdl.handle.net/20.500.11937/20276
    Collection
    • Curtin Research Publications
    Abstract

    Conventional methods of calculating chlorine demand are dose dependent, making intercomparison of samples difficult, especially in cases where the samples contain substantially different concentrations of dissolved organic carbon (DOC), or other chlorine-consuming species. Using the method presented here, the values obtained for chlorine demand are normalised, allowing valid comparison of chlorine demand between samples, independent of the chlorine dose. Since the method is not dose dependent, samples with substantially differing water quality characteristics can be reliably compared. In our method, we dosed separate aliquots of a water sample with different chlorine concentrations, and periodically measured the residual chlorine concentrations in these subsamples. The chlorine decay data obtained in this way were then fitted to first-order exponential decay functions, corresponding to short-term demand (0-4h) and long-term demand (4-168h). From the derived decay functions, the residual concentrations at a given time within the experimental time window were calculated and plotted against the corresponding initial chlorine concentrations, giving a linear relationship. From this linear function, it was then possible to determine the residual chlorine concentration for any initial concentration (i.e. dose). Thus, using this method, the initial chlorine dose required to give any residual chlorine concentration can be calculated for any time within the experimental time window, from a single set of experimental data.

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