期刊
PLASMA PROCESSES AND POLYMERS
卷 7, 期 3-4, 页码 250-257出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ppap.200900077
关键词
acidification; antimicrobial activity; dielectric barrier discharge (DBD); hydrogen peroxide; nitrate; nitrite; non-thermal plasma; plasma-liquid interaction
资金
- German Federal Ministiy of Education and Research [13N9779]
Water disinfection by indirect plasma treatment was investigated using a surface dielectric barrier discharge (DBD). Liquid was neither part of the discharge electrode configuration nor stirred during plasma treatment. High concentrations (10(6)-10(8) cfu.mL(-1)) of Escherichia coli and Staphylococcus aureus have been completely inactivated within 5-15 min, depending on liquid sample volume. Inactivation occurred in non-buffered liquids, only, where pH decrease was found. Measurements of pH, nitrate, and nitrite concentrations after DBD plasma or NO gas treatment lead to the conclusion that nitric acid formation from plasma-generated reactive nitrogen species are the main source of liquid acidification. Incubation of bacteria in nitric acid alone did not result in comparable inactivation effects. Increase of H2O2 concentration was found as a result of plasma treatment of liquids but not after treatment by NO gas. Therefore, synergistic action of both reactive oxygen and nitrogen species are discussed to be responsible for antimicrobial plasma effects.
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