title: UV inactivation of pathogenic and indicator microorganisms.
abstract: Survival was measured as a function of the dose of germicidal UV light for the bacteria Escherichia coli, Salmonella typhi, Shigella sonnei, Streptococcus faecalis, Staphylococcus aureus, and Bacillus subtilis spores, the enteric viruses poliovirus type 1 and simian rotavirus SA11, the cysts of the protozoan Acanthamoeba castellanii, as well as for total coliforms and standard plate count microorganisms from secondary effluent. The doses of UV light necessary for a 99.9% inactivation of the cultured vegetative bacteria, total coliforms, and standard plate count microorganisms were comparable. However, the viruses, the bacterial spores, and the amoebic cysts required about 3 to 4 times, 9 times, and 15 times, respectively, the dose required for E. coli. These ratios covered a narrower relative dose range than that previously reported for chlorine disinfection of E. coli, viruses, spores, and cysts.
authors.forename: J C
authors.initials: JC
authors.lastname: Chang
authors.forename: S F
authors.initials: SF
authors.lastname: Ossoff
authors.forename: D C
authors.initials: DC
authors.lastname: Lobe
authors.forename: M H
authors.initials: MH
authors.lastname: Dorfman
authors.forename: C M
authors.initials: CM
authors.lastname: Dumais
authors.forename: R G
authors.initials: RG
authors.lastname: Qualls
authors.forename: J D
authors.initials: JD
authors.lastname: Johnson
mesh_terms: D000656:Amoeba / Q000528:radiation effects*; D000818:Animals; D001412:Bacillus subtilis / Q000528:radiation effects; D001419:Bacteria / Q000528:radiation effects*; D004203:Disinfection; D004307:Dose-Response Relationship, Radiation; D004755:Enterobacteriaceae / Q000528:radiation effects; D013293:Enterococcus faecalis / Q000528:radiation effects; D017955:Poliovirus / Q000528:radiation effects; D012401:Rotavirus / Q000528:radiation effects; D013171:Spores, Bacterial / Q000528:radiation effects; D013211:Staphylococcus aureus / Q000528:radiation effects; D013242:Sterilization; D014466:Ultraviolet Rays; D014780:Viruses / Q000528:radiation effects*