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Modeling the Inactivation of Particle-Associated Coliform Bacteria

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An equation was derived for describing the measured inactivation of particle-associated coliform bacteria in wastewater secondary effluent exposed to UV light disinfection. Parameters of importance are the inactivation rate coefficient and the total number of particles that contain coliform bacteria. Prediction of coliform bacteria dose–response is possible to within the error associated with the multiple-tube fermentation test. The theoretically derived modeling equation can be used with other design approaches that have specific strengths (e.g., incorporation of regulatory permit limitations or hydraulic characteristics). A minimum particle size seems to govern the ability of a particle to shield coliform bacteria from UV light. Particles smaller than that size do not contain regions shielded from UV light. At sizes greater than the critical particle size, size is not significant in determining shielding of coliform bacteria. Coliform bacteria are not typically located in the most shielded regions within particles, and therefore the inactivation of coliform bacteria within a particle does not indicate the application of UV light throughout that particle.
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Keywords: COLIFORM BACTERIA; DISINFECTION MODEL; PARTICLES; UV LIGHT; WASTEWATER

Document Type: Research Article

Publication date: 2000-07-01

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  • Water Environment Research (WER) is published monthly, including an annual Literature Review. A subscription to WER includes access to the latest content back to 1992, as well as access to fast track articles. An individual subscription is valid for 12 months from month of purchase.

    Water Environment Research (WER) publishes peer-reviewed research papers, research notes, state-of-the-art and critical reviews on original, fundamental and applied research in all scientific and technical areas related to water quality, pollution control, and management. An annual Literature Review provides a review of published books and articles on water quality topics from the previous year.

    Published as: Sewage Works Journal, 1928 - 1949; Sewage and Industrial Wastes, 1950 - 1959; Journal Water Pollution Control Federation, 1959 - Oct 1989; Research Journal Water Pollution Control Federation, Nov 1989 - 1991; Water Environment Research, 1992 - present.
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