Ozone Dissolution vs. Aqueous Methylene Blue Degradation in Semi-Batch Reactors with Dielectric Barrier Discharge over the Water Surface

Joran Velikonja Department of Chemical and Biochemical Engineering and Department of Electrical and Computer Engineering, University of Western Ontario, London, Ontario, Canada, N6A 5B9

Maurice A. Bergougnou Department of Chemical and Biochemical Engineering and Department of Electrical and Computer Engineering, University of Western Ontario, London, Ontario, Canada, N6A 5B9

G. S. Peter Castle Department of Chemical and Biochemical Engineering and Department of Electrical and Computer Engineering, University of Western Ontario, London, Ontario, Canada, N6A 5B9

William L. Cairns Trojan Technologies Inc. London, Ontario, Canada, N5V 4T7

Ion I. Inculet Department of Chemical and Biochemical Engineering and Department of Electrical and Computer Engineering, University of Western Ontario, London, Ontario, Canada, N6A 5B9

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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Ozone Dissolution vs. Aqueous Methylene Blue Degradation in Semi-Batch Reactors with Dielectric Barrier Discharge over the Water Surface

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