期刊
APPLIED SCIENCES-BASEL
卷 9, 期 10, 页码 -出版社
MDPI
DOI: 10.3390/app9102150
关键词
inductively-limited discharge; plasma-treated water; tap water; antimicrobial activity
类别
资金
- German Ministry of Education and Research (BMBF) [13N13960]
- Ministry of Education, Science and Culture of the State of Mecklenburg-Vorpommern [AU 15 001]
A new configuration of a discharge chamber and power source for the treatment of up to 1 L of liquid is presented. A leakage transformer, energizing two metal electrodes positioned above the liquid, limits the discharge current inductively by utilizing the weak magnetic coupling between the primary and secondary coils. No additional means to avoid arcing (electric short-circuiting), e.g., dielectric barriers or resistors, are needed. By using this technique, exceeding the breakdown voltage leads to the formation of transient spark discharges, producing non-thermal plasma (NTP). These discharges effected significant changes in the properties of the treated liquids (distilled water, physiological saline solution, and tap water). Considerable concentrations of nitrite and nitrate were detected after the plasma treatment. Furthermore, all tested liquids gained strong antibacterial efficacy which was shown by inactivating suspended Escherichia coli and Staphylococcus aureus. Plasma-treated tap water had the strongest effect, which is shown for the first time. Additionally, the pH-value of tap water did not decrease during the plasma treatment, and its conductivity increased less than for the other tested liquids.
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