Fenton and Electro-Fenton Methods for Oxidation of H-Acid and Reactive Black 5
Publication: Journal of Environmental Engineering
Volume 132, Issue 3
Abstract
Oxidative treatment of H-acid (HA) and Reactive Black 5 (RB5) using Fenton reagent and the electro-Fenton (EF) method is reported. Optimization of doses of ferrous iron and hydrogen peroxide was carried out in each case using HA; and the oxidation of RB5 was also carried out under the optimized conditions. Approximately 71% chemical oxygen demand (COD) was removed in 2 h using the conventional Fenton method at optimized doses: (5.37 mM), (53.0 mM), . In contrast, more than 92% COD was removed in 15 min using the EF method with an optimized dose of (2.34 mM) and (70.6 mM) of . The pseudo-first-order rate constants for the Fenton reagent and EF method were 0.054 and . The COD removal through the EF method was seven times faster. The calculated energy requirement of the EF method was at the minimum applied current (0.25 A) when approximately 92.5% COD was removed. In the case of RB5, about 67 and 87% COD was removed under optimized Fenton and electro-Fenton conditions, respectively. The higher efficiency of the EF method was attributed to incremental addition of and accompanying higher molar ratio. The results are discussed in the light of the mechanism for Fenton’s oxidation.
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Acknowledgment
The writers thank Dr. Sukumar Devotta, Director, NEERI for encouragement to publish this work.
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Published In
Journal of Environmental Engineering
Volume 132 • Issue 3 • March 2006
Pages: 367 - 376
Copyright
© ASCE.
History
Received: Sep 8, 2003
Accepted: Apr 29, 2005
Published online: Mar 1, 2006
Published in print: Mar 2006
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