Bioassay and dose measurement in UV disinfection.
A bioassay method was developed to measure the average intensity within a UV disinfection reactor. The survival of spores of Bacillus subtilis was determined as a function of UV dose to prepare a standard curve. Spores were added to unknown systems, and the survival rate was used to determine the average intensity. A modification was used for flow-through reactors by which spores were injected as a spike and collected at a known time after injection. A point source summation method for calculating intensity was verified by bioassay measurements in a simple cylinder. This calculation method was also applied to multiple-lamp reactors.
D001412:Bacillus subtilis / Q000502:physiology; D001681:Biological Assay; D004203:Disinfection; D008433:Mathematics; D012722:Sewage; D013171:Spores, Bacterial / Q000528:radiation effects; D013242:Sterilization; D014466:Ultraviolet Rays; D014871:Water Microbiology
D012722:Sewage