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. 1983 Mar;45(3):872-7.
doi: 10.1128/aem.45.3.872-877.1983.

Bioassay and dose measurement in UV disinfection

R G Qualls, J D Johnson

Bioassay and dose measurement in UV disinfection

R G Qualls et al. Appl Environ Microbiol. 1983 Mar.

Abstract

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.

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