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Ozone Dissolution vs. Aqueous Methylene Blue Degradation in Semi-Batch Reactors with Dielectric Barrier Discharge over the Water Surface
Authors:Joran Velikonja  Maurice A. Bergougnou  G. S. Peter Castle  William L. Cairns  Ion I. Inculet
Affiliation:1. Department of Chemical and Biochemical Engineering and Department of Electrical and Computer Engineering , University of Western Ontario , London, Ontario, Canada , N6A 5B9;2. Trojan Technologies Inc. London , Ontario, Canada , N5V 4T7
Abstract:Ozone accumulation in water was compared with aqueous methylene blue (MB) degradation in a stirred semi-batch reactor. Comparable concentrations of gas-phase ozone, generated by parallel-plate dielectric-barrier AC discharge in high-purity oxygen, were allowed to contact the tested liquid using one of three regimens of ozone generation: (1) dry ex-situ; (2) humid ex-situ; and (3) humid in-situ ( “electroozonation” ). Results from (1) and (2) were similar, whereas in case (3) a slower ozone accumulation rate was contrasted by a three times faster MB degradation. A faster decomposition of aqueous ozone due to an assumed prevalence of free-radical induced MB degradation over direct ozonation in case (3) are indicative of a process similar to glow-discharge electrolysis.
Keywords:Ozone  Ozone Generation  Ozone Dissolution  Aqueous Ozone  Electroozonation  Advanced Oxidation  Hydroxyl Radicals  Hydrogen Peroxide  Methylene Blue  Glow-discharge Electrolysis
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