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Generation of Chemically Active Species in Hybrid Gas-Liquid Discharges  

Chung, Jae-Woo (Department of Environmental Engineering, Jinju National University)
Locke, Bruce R. (Department of Chemical Engineering, FAMU-FSU College of Engineering, Florida State University of Florida A&M University)
Publication Information
Journal of Korean Society of Environmental Engineers / v.29, no.5, 2007 , pp. 556-563 More about this Journal
Abstract
We carried out a laboratory scale experiment about the characteristics of chemically active species produced in hybrid gas-liquid discharges. The electrode configuration which had high voltage electrode in the gas phase and ground electrode in the liquid was utilized while high voltage electrode has been typically positioned in the liquid in other studies. Our electrode was configured in such a way as to increase the energy efficiency of chemical reactions by creating a higher electrical field strength and a narrower pulse width than the typical electrode configuration. The highest ozone concentration was obtained at 45 kV which was the medium value in operating voltages. The decrease of solution conductivity increased the resistance of liquid phase and the electric field strength through the gas phase, so ozone gene-ration rate was enhanced. The increase of voltage promoted the production rate of hydrogen peroxide by increasing the electric field strength. In a lower voltage, the increase of solution conductivity increased the degradation rate of $H_2O_2$, so the $H_2O_2$ generation rate decreased. On the other hand, the effects of UV radiation, shock waves etc. increased the $H_2O_2$ generation rate as the solution conductivity increased. A higher rate of $H_2O_2$ generation can be achieved by mixing argon to oxygen which generates a stronger and more stable discharges.
Keywords
Hybrid Gas-Liquid Discharges; Chemically Active Species; Operating Parameters;
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