title: Comparison of methods of enumerating coliforms after UV disinfection.
abstract: In view of the differences that have been found between the most-probable-number and membrane filtration methods for the recovery of coliforms from chlorinated samples, the survival of total and fecal coliforms in UV-irradiated effluent samples, as tested by the most-probable-number and standard single-step membrane filtration methods, was compared. There were no significant differences in the survival of total and fecal coliforms, as tested by the two methods. In a separate set of experiments comparing total and fecal coliform survival, as tested by the most-probable-number method, only a very small but statistically significant difference of 0.1 log survival units was found. For UV-disinfected wastewater effluents, standard one-step membrane filtration procedures are comparable to standard most-probable-number procedures.
mesh_terms: D004203:Disinfection; D004755:Enterobacteriaceae / Q000302:isolation & purification* / Q000528:radiation effects; D005243:Feces / Q000382:microbiology; D005374:Filtration; D006801:Humans; D012722:Sewage; D013242:Sterilization; D014466:Ultraviolet Rays; D014871:Water Microbiology
chemical_list: D012722:Sewage