Ozone Dissolution vs. Aqueous Methylene Blue Degradation in Semi-Batch Reactors with Dielectric Barrier Discharge over the Water Surface |
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| Authors: | Joran Velikonja Maurice A. Bergougnou G. S. Peter Castle William L. Cairns Ion I. Inculet |
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| 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 |
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| 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. |
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| Keywords: | Ozone Ozone Generation Ozone Dissolution Aqueous Ozone Electroozonation Advanced Oxidation Hydroxyl Radicals Hydrogen Peroxide Methylene Blue Glow-discharge Electrolysis |
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