Generation of Liquid Phase Oxidants in Bubbles and Foam
Pawłat J., Hensel K., Ihara S.
22nd Symposium on Plasma Physics and Technology SPPT, Prague (Czech Republic), June 26-29, 79-80 (2006)
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Abstract: Generation of dissolved ozone (O3) and hydrogen peroxide (H2O2) in systems of foaming and bubbling columns by a pulse powered electric discharge was studied. The systems are considered as new alternative allowing the simultaneous generation of oxidants and the treatment of the pollutants in one reaction vessel. In the foaming column up to 74 mg/l of H2O2 was generated. The best results were observed for 60 Hz pulse repetition rate after 20 minutes of discharge operation. The concentration of H2O2 was an order of the magnitude larger than in the case of the bubbling column and two orders of the magnitude larger than in the case of submerged electrodes. The highest concentration of dissolved O3 was 1.38 mg/l. It was obtained in the bubbling system for 60 Hz pulse repetition rate after 5 minutes of discharge operation. Similar results were, however, obtained also in the foaming column (1.36 mg/l). With submerged electrodes the amount of dissolved ozone decreased down to 0.72 mg/l. In all systems, concentrations of active species increased with the operation time and pulse repetition rate.
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