Abstract
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.
Highlights
In recent years, investigations of plasma-liquid interactions have become an important topic in plasma science and technology, not least being stimulated by the accelerating field of plasma medicine
The results of the experiments with tap Marotta et al described experiments with a DBD regarding the degradation of phenol in plasmawater were compared with those of plasma-treated saline solution
A new to configuration of the discharge chamber and power wasThe presented utilizing high of hypothesized be caused by dissociation of nitric oxidessource in water
Summary
Investigations of plasma-liquid interactions have become an important topic in plasma science and technology, not least being stimulated by the accelerating field of plasma medicine. Resulting from plasma-liquid interactions, very complex physical as well as chemical processes occur starting from gas phase chemistry via multiphase species transport, mass and heat transfer up to interfacial reactions and very complex liquid phase chemistry. In the case of low-temperature plasma sources working at atmospheric air conditions (cold atmospheric plasmas—CAP), this chemistry is mainly determined by reactive oxygen and nitrogen species transferred from the gas/plasma phase into the liquid phase or generated in the liquid phase by secondary reactions [1,2]. Several electrode configurations and modes of electrical operation for liquid treatment were investigated. These discharges can be ignited directly in the liquid [3], between one electrode above the liquid and
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