Factors Influencing Ultraviolet Disinfection Performance Part II: Association of Coliform Bacteria with Wastewater Particles

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A technique is described for quantifying the number of particles with embedded coliform bacteria in wastewater samples. This technique was applied to eight different wastewater samples collected from cight significantly different treatment processes (five variations of the activated-sludge process, a trickling filter, an aerated lagoon, and a facultative lagoon). For all treatment process types that did not usc chemical coagulants, total number of particles with embedded coliform bacteria correlated linearly with number of residual coliform bacteria following high doses of UV light. Lagoon treatment processes led to the formation of fewer bacteria-associated particles than either the activated-sludge or trickling-filter processes. Chemical coagulants showed a potential to significantly reduce the inactivation fraction of coliform bacteria associated with particles.


Document Type: Research Article

DOI: http://dx.doi.org/10.2175/106143097X122004

Publication date: September 1, 1999

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  • 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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