Electrochemical Desulfurization of Waste Gases in a Batch Reactor
Publication: Journal of Environmental Engineering
Volume 133, Issue 1
Abstract
To meet the increasing need for reduction of exhaust emissions from stationary sources, many technologies have been developed to remove from flue gas. In this study the anodic oxidation of sulfur dioxide in aqueous solutions of sulfuric acid with a unique reactor design and electrode configuration has been investigated. An electrochemical absorption column larger than laboratory scale was employed. A titanium rod cathode and platinum expanded mesh anode separated by a cation exchange membrane were used as electrodes in the cylindrical electrochemical reactor. The effects of current densities of 10, 1, and , initial concentrations of 500, 2,500, and , gas flow rates of 0.75, 1.5, and , sulfuric acid concentrations of 1, 5, and , gas composition, and electrolysis time on removal efficiency, current efficiency, energy consumption, and mass transfer coefficient were reported. Removal efficiency of 94% was obtained with a high current efficiency of 94%, energy consumption of , and mass transfer coefficient of without additives or pretreatment. At the current densities of 0.1, 1, and , the removal efficiencies were 10, 94, and 98%, respectively. Removal efficiency was observed to decrease as inlet concentration, gas flow rate, and electrolyte concentration increased. The presence of in the gas mixture led to a decrease in the removal efficiency. During electrochemical absorption of into the solution, the concentration of acid is increased from 5 to 10%. At the end of the studies, electrochemical desulfurization succeeded in meeting the regulation requirement, and the absorbing liquid remained in a reusable form.
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Acknowledgments
This study was supported by the Research Fund of Anadolu University.
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Published In
Journal of Environmental Engineering
Volume 133 • Issue 1 • January 2007
Pages: 13 - 19
Copyright
© 2007 American Society of Civil Engineers.
History
Received: Oct 13, 2004
Accepted: May 25, 2006
Published online: Jan 1, 2007
Published in print: Jan 2007
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