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Factors Influencing Ultraviolet Disinfection Performance Part II: Association of Coliform Bacteria with Wastewater Particles
Author(s) -
Emerick Robert W.,
Loge Frank J.,
Thompson Don,
Darby Jeannie L.
Publication year - 1999
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143097x122004
Subject(s) - trickling filter , wastewater , bacteria , coliform bacteria , activated sludge , pulp and paper industry , facultative , chemistry , sewage treatment , environmental chemistry , environmental science , microbiology and biotechnology , environmental engineering , biology , ecology , genetics , engineering
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.