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Used tires, pistachio shells clean pollution.

Researchers have developed a way to use old tires and pistachio shells to remove mercury emissions from power plants.

Activated carbon adsorbents made from the tires and shells are as effective and could be cheaper to produce than commercial products, say researchers at the University of Illinois and Illinois State Geological Survey. With funding from the Electric Power Research Institute (EPRI) and Illinois Office of Solid Waste Research, they sought materials that could remove mercury from combustion flue gases.

In a collaborative program, the researchers prepared adsorbents from a variety of feedstocks including Illinois high-sulfur coal, waste tires and pistachio shells. They then evaluated the effectiveness at removing elemental mercury and mercuric chloride from several simulated combustion gas streams.

Studies found that mercury removal was affected by the adsorbent and flue gas compositions. The adsorbents removed both forms of mercury in one flue gas, and in another the tire and pistachio carbons had nearly five times larger capacity for the adsorption of mercuric chloride than coal-derived counterparts.

Results also showed that activated carbons containing sulfur additives are more effective at removing mercury emissions from the flue gases.
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Title Annotation:mercury emission removal from flues
Publication:Resource: Engineering & Technology for a Sustainable World
Article Type:Brief Article
Geographic Code:1USA
Date:Oct 1, 2000
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