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Ultraviolet rays, active radicals (OH, H, O), H 2 O 2  and O 3  produced by the streamer discharge using a pulse power are widely used to deactivate microorganisms and remove organic contaminants in water. The dominant factor for these is the oxidized reaction by hydrogen peroxide and dissolved O 3  in water. When hydrogen peroxide is with dissolved O 3  in water, OH radical is powerfully generated because the dissolved O 3  is decomposed easily. In this paper, the wet packed-barrier reactor (WPBR) applied the high voltage with the frequency of 20 ~ 30 kHz was used to create plasma. The electrodes of the reactor are composed not to be contacted with water because water contamination by the erosion of electrodes exposed to the water should be minimized. Active radicals and O 3  could be produced by the plasma. O 3  might be dissolved by bubbling discharged air into water. It seems that H 2 O 2  could be formed by reacting active radicals with water. The concentrations of H 2 O 2  and the dissolved O 3  increased with increasing applied voltage, however when the frequency of applied voltage increased, the O 3  concentration decreased and the H 2 O 2  concentration slightly increased. The concentrations of dissolved O 3  is about 30 times greater for plasma reactor than for O 3  generator which is the same plasma reactor without water. When the initial temperature of the water increased, dissolved O 3  concentration increased linearly and the H 2 O 2  concentration was nearly saturated at 13 °C.

journal of advanced oxidation technologies

The Simultaneously Generating Characteristics of Dissolved O 3  and H 2 O 2  Using a Wet Packed-Barrier Type Reactor Applied High- Frequency Voltage in Tap Water