Mass Transfer Effects on Kinetics of Dibromoethane Reduction by Zero-Valent Iron in Packed-Bed Reactors
Publication: Journal of Environmental Engineering
Volume 128, Issue 1
Abstract
Mass transfer effects on the kinetics of 1,2-dibromoethane (EDB) reduction by zero-valent iron (ZVI) in batch reactors, a laboratory scale packed-bed reactor, and a pilot scale packed-bed reactor are described. EDB was debrominated by ZVI to ethylene and bromide. EDB sorption to the cast iron surface was nonlinear and was described by a Langmuir equation. Laboratory scale column studies showed a nonlinear dependence of EDB removal on flow rate and initial EDB concentration. A nonequilibrium model of EDB sorption and reaction dependent on mass transfer was constructed using the laboratory scale data. The model was verified using data from a larger pilot scale packed-bed reactor that was used to remove EDB from contaminated groundwater. The data showed two distinct removal processes, an initial rapid phase dominated by mass transfer followed by a slower phase where surface reactions dominated. The model successfully predicted the transition from mass transfer controlled to surface reaction controlled conditions in the pilot scale data.
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Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 128 • Issue 1 • January 2002
Pages: 85 - 93
Copyright
Copyright © 2002 American Society of Civil Engineers.
History
Received: Jun 6, 2000
Accepted: Jun 25, 2001
Published online: Jan 1, 2002
Published in print: Jan 2002
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