Comparative Inactivation of Bacillus subtilis Spores Using a DBD-Driven Xenon Iodide Excilamp and a Conventional Mercury Lamp

Author

Guivan, Mykola M. ; Kamikozawa, Takashi ; Kurokawa, Hisayoshi ; Motomura, Hideki ; Kadowaki, Kazunori ; Jinno, Masafumi

Author_Institution

Dept. of Quantum Electron., Uzhgorod Nat. Univ., Uzhgorod, Ukraine

Volume

38

Issue

8

fYear

2010

Firstpage

1972

Lastpage

1977

Abstract

In this paper, we compared the inactivation of Bacillus subtilis spores in water by means of a dielectric-barrier-discharge (DBD)-driven XeI* excilamp and a low-pressure mercury lamp. The main part ( ~ 76%) of the excilamp output was due to the B → X transition of XeI* exciplex at 253 nm. It is shown for the first time that a better sterilization action is achieved with the DBD-driven XeI* excilamp compared with the monochromatic mercury lamp at the same UV dose. The contribution of an atomic iodine emission in the range of 178-207 nm has been confirmed. Germ-reduction experiments with the XeI* excilamp have been carried out in a steady-state mode and in a water-flow reactor.

Keywords

biological techniques; discharges (electric); mercury vapour lamps; microorganisms; sterilisation (microbiological); B →X transition; Bacillus subtilis spores; DBD-driven XeI excilamp; DBD-driven xenon iodide excilamp; XeI exciplex; atomic iodine emission; comparative inactivation; dielectric-barrier-discharge; excilamp output; germ-reduction experiments; low-pressure mercury lamp; monochromatic mercury lamp; steady-state mode; sterilization action; water-flow reactor; wavelength 178 nm to 207 nm; wavelength 253 nm; Dielectric barrier discharge (DBD); UV disinfection; UV dose; excilamp; inactivation; xenon iodide;

fLanguage

English

Journal_Title

Plasma Science, IEEE Transactions on

Publisher

ieee

ISSN

0093-3813

Type

jour

DOI

10.1109/TPS.2010.2044588

Filename

5452997