Liquid Sodium Ferrate and Fenton’s Reagent for Treatment of Mature Landfill Leachate
Publication: Journal of Environmental Engineering
Volume 133, Issue 11
Abstract
As landfills mature, biodegradable matter in leachate is consumed and remaining compounds are increasingly recalcitrant. In this work, ferrate was compared to Fenton’s reagent for the purpose of removing nonbiodegradable organic compounds from mature leachate. Oxidation conditions (time, pH, and dose) were optimized to yield maximum organic removal using two leachate samples from 20- and 12-year-old solid waste cells. Results from this study demonstrated that Ferrate and Fenton’s reagent had similar optimum pH ranges (3–5), but different organic removal capacities, ranging from 54 to 79% of initial leachate organic contents. An advantage of ferrate was that it was effective over a wide pH range. Advantages associated with Fenton’s reagent include that it had higher organic removal capacity, produced more oxidized organic compounds (measured as chemical oxygen demand/dissolved organic carbon), and produced more biodegradable byproducts (measured as chemical oxygen demand/5-day biochemical oxygen demand). Finally, both treatments were found to attack larger molecules , as indicated by an increase in smaller molecule contribution to organic carbon.
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Acknowledgments
The writers would like to thank the William W. “Bill” Hinkley Center for Solid and Hazardous Waste Management for funding this work. The writers also appreciate the help of Dr. Virender Sharma from Florida Institute of Technology for his help in ferrate synthesis and Ferrate Treatment Technologies, LLC, for providing reagents and equipment necessary for ferrate production.
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Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 133 • Issue 11 • November 2007
Pages: 1042 - 1050
Copyright
© 2007 ASCE.
History
Received: Apr 26, 2006
Accepted: Apr 26, 2007
Published online: Nov 1, 2007
Published in print: Nov 2007
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