Clogging of Tire Shreds and Gravel Permeated with Landfill Leachate
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 131, Issue 6
Abstract
The clogging of tire shreds and gravel is based on four column tests permeated with landfill leachate for up to . Two different types of tire shred (G shred: ; and P shred: with many exposed wires) and a uniformly graded gravel were examined. The compressibility of the G and P shreds at were reported to be 48 and 44%, respectively while the initial hydraulic conductivities were 0.007 and , respectively (compared to for the gravel). The gravel maintained a hydraulic conductivity greater than for about three times longer than a similar thickness of compressed (at ) tire shreds. The tests were conducted at an accelerated flow rate of . At termination of the rubber shred columns after about the hydraulic conductivity at the influent end of the columns had dropped to between and . At termination of the gravel columns after the corresponding range was . The clog was predominantly calcium carbonate, with calcium making up 29–34% of the total clog material. Aluminum, zinc, iron, and copper leached from the P and G shreds when exposed to typical municipal solid waste leachate, however they were not detected in the effluent leachate. The highest concentration of metals was found in the P-shred clog and this is attributed to the greater abundance of exposed steel in these shreds. It is inferred that gravel should continue to be used in critical zones where there is a high mass loading. The results suggest that an increased thickness of compressed tire shred may be used to give a service life similar to that of a given thickness of gravel in noncritical zones.
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Acknowledgments
This research reported in this paper was funded by Laflèche Environmental Inc. The writers are grateful to Andre Laflèche and Martin Zimmer for making it possible to perform this study. The value of discussions and assistance of Jamie VanGulck, Jon Southen, and Gary Lusk are gratefully acknowledged.
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© 2005 ASCE.
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Received: May 13, 2004
Accepted: Sep 13, 2004
Published online: Jun 1, 2005
Published in print: Jun 2005
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