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    Effects of freezing on UV inactivation of waterbourne microorganisms

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    WilliamsA2009m-1b.pdf (4.358Mb)

    Date

    2009

    Author

    Williams, Andrea Nancy

    Degree

    Master of Science

    Discipline

    Engineering

    Subject

    Water
    Purification
    Ultraviolet treatment
    Freezing process
    Bacteria
    Effect of freezes on
    Effect of ultraviolet radiation on

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    Abstract

    In northern communities where source water may be frozen for parts of the year or wastewater is treated using freezing technology, the efficiency of UV inactivation may be affected. This research was carried out to investigate the response of Escherichia coli, Enterococcus faecalis and spores of Bacillus subtilis to UV irradiation after freezing and possible photoreactivation after the bacteria were exposed to UV. The inactivation of E. coli (doses 1.5 - 9mJ/cm2), E. faecalis (6 - 25mJ/cm2) and B. subtilis spores (20 - mJ/cm2) by ultraviolet light was investigated using a collimated beam UV apparatus.

    URI

    http://knowledgecommons.lakeheadu.ca/handle/2453/336

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