Electrolytic Oxidation of Polynuclear Aromatic Hydrocarbons from Creosote Solution Using and Circular Mesh Electrodes
Publication: Journal of Environmental Engineering
Volume 135, Issue 10
Abstract
The electrooxidation of polynuclear aromatic hydrocarbons (PAHs) in solution was investigated. Most of the PAHs compounds are toxic and hardly biodegradable, so that a chemical or physicochemical treatment is required. In this paper, we reported treatment of synthetic creosote oily effluent (COE) containing several PAHs by using and circular or cylindrical mesh anode electrodes. COE was prepared with distilled water and a commercial creosote solution in the presence of an amphoteric surfactant (CAS). In addition to anode material, different operating parameters were investigated such as current density, reaction time, recycling flow rate, and oxygen injection flow rate. The first series of experiments carried out in the recirculating batch reactor showed that circular electrode was found to be more effective in removing PAHs than circular or cylindrical electrodes. Current density and retention time played important roles for PAHs degradation efficiency, whereas circulation flow rate and oxygen injection slightly influenced the removal efficiency. Finally, the best and simplest operating conditions (82–84% of PAHs removal) determined for PAHs degradation in COE were obtained at a current density of through 90 min of treatment with a recycling rate of 3.6 L/min but without injection in the close loop. Likewise, in the recirculating batch tests, PAHs decomposition exhibited behaviors of the fist-order reaction with a rate coefficient of . The energy consumption was . The second series of experiment using successively batch and continuous treatment of COE shows that the percentage of PAHs degradation could be maintained above 80% up to 18 h of treatment, thereafter, removal efficiency decreased owing to the formation of organic substances on the electrodes surface.
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Acknowledgments
Sincere thanks are extended to the Canada Research Chairs and to the National Sciences, Engineering Research Council of Canada, and Filter Innovations Inc. for their financial contribution (Grant No. STPGP 320053-05) to this study.UNSPECIFIED
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Information
Published In
Journal of Environmental Engineering
Volume 135 • Issue 10 • October 2009
Pages: 1051 - 1062
Copyright
© 2009 ASCE.
History
Received: Jul 24, 2008
Accepted: Feb 10, 2009
Published online: Apr 3, 2009
Published in print: Oct 2009
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