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    Formation of targeted and novel disinfection by-products during chlorine photolysis in the presence of bromide

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    Formula assignments for samples AA - DD (18.29Mb)
    Formula assignments for samples EA - HD (17.63Mb)
    Formula assignments for samples IA - LD (18.06Mb)
    Formula assignments for samples MA - QD (22.87Mb)
    Date
    2023
    Author
    Bulman, Devon Manley
    Milstead, Reid P.
    Remucal, Christina K.
    Metadata
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    Abstract
    Chlorine photolysis is an advanced oxidation process that relies on the combined use of direct chlorination by free available chlorine, direct photolysis, and reactive oxidants to transform contaminants. In waters that contain bromide, free available bromine and reactive bromine species can also form. However, little is known about the underlying mechanisms or formation potential of disinfection by-products (DBPs) under these conditions. We investigated reactive oxidant generation and DBP formation under dark conditions, chlorine photolysis, and radical-quenched chorine photolysis with variable chlorine (0 – 10 mg-Cl2/L) and bromide (0 – 2,000 µg/L) concentrations, as well as with free available bromine. Hydroxyl radical, ozone, and reactive halogen species increase with chlorine concentration and are minimally impacted by bromide. Radical-mediated processes partially contribute to the formation targeted DBPs (i.e., trihalomethanes, haloacetic acids, haloacetonitriles, chlorate, and bromate), which increase with increasing chlorine concentration. Chlorinated novel DBPs detected by high-resolution mass spectrometry are attributable to a combination of dark chlorination, direct halogenation by reactive chlorine species, and transformation of precursors, whereas novel brominated DBPs are primarily attributable to dark bromination of electron-rich formulas. The formation of targeted and novel DBPs during chlorine photolysis in waters with elevated bromide may limit treatment applications.
    Subject
    advanced oxidation process
    disinfection byproducts
    chlorine photolysis
    high-resolution mass spectrometry
    Permanent Link
    http://digital.library.wisc.edu/1793/84028
    DOI
    https://doi.org/10.21231/7REA-2Z14
    Description
    This data set contains all formula assignments as determined using FT-ICR MS.
    Citation
    Bulman, D. M., Milstead, R. P., & Remucal, C. K. (2023). Formation of targeted and novel disinfection by-products during chlorine photolysis in the presence of bromide [Data set]. University of Wisconsin - Madison. https://doi.org/10.21231/7REA-2Z14
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