Disinfection by HO2 Radicals Generated by Negative Corona Discharge on Acidic Solution

An oxygen-supplied negative direct current (dc) corona discharge on acidic solution is studied to reduce the odor associated with conventional disinfectants, such as ClO − , HClO, O 3 , and ClO 2 . The discharge system provided an odorless bactericide of hydroperoxyl (HO 2 ) radicals, generated from...

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Bibliographic Details
Published in:IEEE transactions on plasma science 2019-01, Vol.47 (1), p.346-349
Main Authors: Suganuma, R., Kawasaki, S., Yasuoka, K.
Format: Article
Language:English
Subjects:
Acidic solution
Corona
corona discharge
Deactivation
Direct current
Discharge
Discharges (electric)
Disinfectants
Disinfection
Disinfection & disinfectants
E coli
Electrodes
Escherichia coli (E. coli)
Hydrogen
Hydrogen peroxide
hydroperoxyl radical
Inactivation
Inductors
Microorganisms
Odors
Radicals
Stellar coronas
Superoxide dismutase
superoxide dismutase (SOD)
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Summary:An oxygen-supplied negative direct current (dc) corona discharge on acidic solution is studied to reduce the odor associated with conventional disinfectants, such as ClO − , HClO, O 3 , and ClO 2 . The discharge system provided an odorless bactericide of hydroperoxyl (HO 2 ) radicals, generated from the reaction of discharge-generated \text{O}_{2}^{-} with H + in the acidic solution. A 2.5-log reduction of Escherichia coli (E. coli) was observed under the conditions of pH 2.8, dc −4.8-kV dc, and - 17\,\,\mu \text{A} , where the concentration of ozone and hydrogen peroxide was too low to inactivate the E. coli. At a pH of 5.6 or by adding a superoxide dismutase, which is a scavenger of HO 2 , negligible inactivation was observed.
ISSN:0093-3813
1939-9375
DOI:10.1109/TPS.2018.2879384