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| Posted Nov 15, 2005 PT |
Engineers design new method of covering and draining landfills
Timothy Stark, a professor of civil and environmental engineering at the University of Illinois at Urbana-Champaign, and Krishna Reddy, a professor of civil engineering at the University of Illinois at Chicago, have proposed using shredded tires to cover landfills.
See more articles like this one at www.EnvironmentalFactor.org
Original news summary: (http://www.sciencedaily.com/releases/2005/10/051003232701.htm)
- Timothy Stark, a professor of civil and environmental engineering at the University of Illinois at Urbana-Champaign, and Krishna Reddy, a professor of civil engineering at the University of Illinois at Chicago, recently evaluated the use of shredded tires as a drainage material in waste-containment systems.
- Shredding tires into chips roughly 4 inches by 6 inches, they report, offers a simple and cost-effective way of providing drainage for modern landfills, remediating older landfills, and disposing of mountains of scrap tires.
- Nearly 280 million tires are discarded annually in the United States.
- Piles of worn-out tires can become eyesores and breeding grounds for mosquitoes.
- In landfills, intact tires can collect methane (produced by decomposing waste) and create potential fire hazards.
- Over time, these tires can work their way to the surface, where they can damage liner covers and cause increased leachate production that could contaminate groundwater.
- "As a result, many states now require that scrap tires be shredded into chips prior to disposal," Reddy said.
- The drainage layer prevents water from percolating through the waste and polluting the ground water, Reddy said.
- Stark and Reddy monitored the two sites for such characteristics as settlement, erosion, flow rates and water quality, and compared them with conventional sites that used sand or gravel.
- "The tires must be shredded for disposal anyway, so there is fairly little expense compared to buying and hauling sand or gravel."
- The remediation of old landfills could consume huge quantities of scrap tires.
- "A drainage layer one-foot-thick covering one acre requires about 70,000 tires," Stark said.
- "A typical landfill covers 10 to 20 acres, and there are about 150 abandoned landfills in Illinois, alone, that are in need of some degree of remediation."
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