Effects of Design Mix and Porosity of Waste-Derived Paste as Landfill Daily Covers on Lead Retardation
Publication: Practice Periodical of Hazardous, Toxic, and Radioactive Waste Management
Volume 14, Issue 3
Abstract
An innovative waste-derived paste of waste tire chips and paper sludge was proposed for daily cover applications in municipal solid waste landfills. In this study, retardation and transport behaviors of lead (Pb) by the proposed paste were investigated using column tests. Breakthrough curves of 16 specimens at various design mixes and porosities were presented. A one-dimensional equilibrium deterministic transport model was used to fit the transport parameters from the breakthrough curves and to verify the homogeneity of the specimens. Analysis of the effluent concentrations from the column tests displayed a retardation effect for Pb in all cases, with fitted retardation factors ranging from 19.9 to 59.0. Lead retardation by the proposed paste was found to be sensitive to the paste’s porosity and design mix. Early arrivals of solute were observed unexpectedly in columns with high paper sludge content under high packing densities and were attributed to the possible presence of preferential flow paths. The results also suggest that an optimal porosity and design mix for the paste existed with respect to Pb retardation.
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Acknowledgments
The writers would like to express their thanks to the anonymous companies for providing the materials used in this study.
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Published In
Practice Periodical of Hazardous, Toxic, and Radioactive Waste Management
Volume 14 • Issue 3 • July 2010
Pages: 195 - 204
Copyright
© 2010 ASCE.
History
Received: Apr 20, 2009
Accepted: Jan 12, 2010
Published online: Jun 15, 2010
Published in print: Jul 2010
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