Effective Inactivation of Bacillus subtilis Spores by a Combination Treatment of Ozone and UV Irradiation in the Presence of Organic Compounds

The kinetics of the inactivation of Bacillus subtilis spores by ozone alone and ozone with UV irradiation were investigated in a circulation system of a 5.3l ofsaline suspension (106 spores/ml) under various conditions of ozone concentration (3.0 and 7.0 mg/l in inlet gas) and UV intensity (3, 413 a...

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Bibliographic Details
Published in:Biocontrol Science 1997/09/20, Vol.2(2), pp.99-103
Main Authors: URAKAMI, ITSUO, MOCHIZUKI, HIROMI, INABA, TOSHIAKI, HAYASHI, TATSUTOSHI, ISHIZAKI, KOZO, SHINRIKI, NARIKO
Format: Article
Language:English
Subjects:
Bacillus subtilis spore
Combination treatment
Hydroxyl radical
Organic substances
Ozone
Spore inactivation
UV irradiation
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Summary:The kinetics of the inactivation of Bacillus subtilis spores by ozone alone and ozone with UV irradiation were investigated in a circulation system of a 5.3l ofsaline suspension (106 spores/ml) under various conditions of ozone concentration (3.0 and 7.0 mg/l in inlet gas) and UV intensity (3, 413 and 13, 650 μw/cm2).The spore inactivation by ozone with UV irradiation was more effective than by ozone alone in the presence of organic compounds such as tryptophan and ribose. The combination treatment of ozone and UV is considered to be a useful disinfection method for practical use.
ISSN:1342-4815
1884-0205
DOI:10.4265/bio.2.99