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Suitability of shredded tyres as a substitute for a landfill leachate collection medium

Department of Civil and Environmental Engineering, University of Wisconsin-Madison, U.S.A., park{at}engr.wisc.edu

Tuncer B. Edil

Department of Civil and Environmental Engineering, University of Wisconsin-Madison, U.S.A.

Jae Y. Kim

Department of Urban Engineering, Seoul National University, Korea

Mock Huh

Department of Environmental Engineering, Cheju National University, Korea

Sung Ho Lee

College of Environmental Science and Technology, Kyemyung University, Korea, Former President of Korea Solid Waste Engineering Association

Jung Jun Lee

Department of Civil and Environmental Engineering, Jeonnam National University, Korea, President of Korea Solid Waste Engineering Association

A series of tests were conducted to investigate the fate of heavy metals and gasoline components in a simulated landfill, consisting of a 30 cm thick clay liner and a leachate collection layer containing tyres as well as in two test cells installed in a landfill. Arsenic, selenium, mercury, barium, and lead concentrations were lower while zinc concentration was higher in the tank containing tyre-chips than the tank without tyre-chips. When samples were filtered, however, concentrations of zinc as well as other inorganics were lower in the tank containing tyre-chips, indicating that metals in the leachate exposed to tyre-chips travel more slowly in a subsurface environment due to filtering effect.

In a test cell study, arsenic, cobalt, lead and nickel concentrations were lower in the cell containing tyre-chips than in the cell without tyre-chips, except iron and zinc. Both tests indicate that some inorganic contaminants are sorbed to tyre-chips. Gasoline components were also significantly sorbed by tyre-chips in field cell tests. Although tyre-chips are known to leach organic and inorganic contaminants, concentrations in field conditions will be lower than the reported experimental results since the tests were performed under worst-case scenarios. If tyre-chips are used in areas where contamination levels are high, then they can be used as a sorbent for environmental clean-up.

Key Words: Heavy metals • landfill • organic compounds • shredded tyres • sorption • tyre-chips • wmr 544-4

Waste Management & Research, Vol. 21, No. 3, 278-289 (2003)
DOI: 10.1177/0734242X0302100311


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