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    • Evaluation of Monochloramine and Free Chlorine Penetration in a Drinking Water Storage Tank Sediment Using Microelectrodes

    Metadata Updated: November 12, 2020

    Sediment accumulation in water storage tanks may protect microorganisms from disinfectant exposure, causing water quality degradation. However, microbial activity and disinfectant penetration within water storage sediment remains largely uncharacterized. This study evaluated monochloramine and free chlorine penetration into a 2-cm (20,000 µm) deep drinking water storage tank sediment using microelectrodes. The sediment was successively exposed to 4-months monochloramine, 2-months free chlorine, and 2-months monochloramine. Temporal monochloramine, free chlorine, dissolved oxygen (DO), pH, ammonium, nitrite, and nitrate profiles were acquired using microelectrodes. Results showed that complete monochloramine or free chlorine penetration was not observed. Likewise, DO never fully penetrated the sediment, progressing inward with time to a maximum depth of 10,000 µm and indicating microbial activity remained during the entire 8 months. Decreasing ammonium and increasing nitrate concentrations, with minimal nitrite accumulation, further demonstrated microbial activity and indicated complete sediment nitrification. There was measurable ammonium, nitrite, and nitrate during free chlorine application and nitrification activity gradually resumed upon a switch back to monochloramine. These findings suggest that periodic sediment removal from drinking water storage facilities is desirable to remove potentially protected environments for microorganisms.

    This dataset is associated with the following publication: Liu, H., D. Wahman, and J. Pressman. Evaluation of Monochloramine and Free Chlorine Penetration in a Drinking Water Storage Tank Sediment Using Microelectrodes. ENVIRONMENTAL SCIENCE & TECHNOLOGY. American Chemical Society, Washington, DC, USA, 53(16): 9352-9360, (2019).

    Access & Use Information

    Public: This dataset is intended for public access and use. License: See this page for license information.

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    References

    https://doi.org/10.1021/acs.est.9b01189

    Dates

    Metadata Created Date November 12, 2020
    Metadata Updated Date November 12, 2020

    Metadata Source

    Harvested from EPA ScienceHub

    Other Data Resources

    Additional Metadata

    Resource Type Dataset
    Metadata Created Date November 12, 2020
    Metadata Updated Date November 12, 2020
    Publisher U.S. EPA Office of Research and Development (ORD)
    Maintainer
    Identifier https://doi.org/10.23719/1503400
    Data Last Modified 2019-02-11
    Public Access Level public
    Bureau Code 020:00
    Schema Version https://project-open-data.cio.gov/v1.1/schema
    Harvest Object Id 9be075d8-a006-4fbc-87ea-c6c4f857fa3e
    Harvest Source Id 04b59eaf-ae53-4066-93db-80f2ed0df446
    Harvest Source Title EPA ScienceHub
    License https://pasteur.epa.gov/license/sciencehub-license.html
    Program Code 020:096
    Publisher Hierarchy U.S. Government > U.S. Environmental Protection Agency > U.S. EPA Office of Research and Development (ORD)
    Related Documents https://doi.org/10.1021/acs.est.9b01189
    Source Datajson Identifier True
    Source Hash 5a23261925d3fb71f30da5ec82bcf3a3cbd089aa
    Source Schema Version 1.1

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