Water Treatment by Dielectric Barrier Discharge Tube with Vapor Flow

Non-thermal plasma technologies with water vapor have been developed for a wide range of applications. In this study, a water treatment which introduces a vaporized solution into a coaxial dielectric barrier discharge (DBD) tube using Ar was investigated experimentally. To clarify the organic decomposition characteristics, acetic acid was decomposed by this treatment. A diluted acetic acid solution was vaporized by a water vaporizer in advance and introduced into the DBD tube. The residence time of the water vapor introduced into the discharge area in a DBD tube was approximately 6–8 ms. Acetic acid was effectively decomposed and the decomposition ratio reached almost 70% for small water flow rate, despite the short residence time, which is superior to the mist plasma treatment. Keywords—Water treatment, DBD tube, vapor flow, organic pollutants