Author： Emerick Robert W. Loge Frank J. Thompson Don Darby Jeannie L.
Publisher： Water Environment Federation
ISSN： 1061-4303
Source： Water Environment Research, Vol.71, Iss.6, 1999-09, pp. : 1178-1187
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Abstract
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.
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