Control of Chromated Copper Arsenate Wood Incineration Air Emissions and Ash Leaching Using Sorbent Technology
Publication: Journal of Environmental Engineering
Volume 130, Issue 2
Abstract
Chromated copper arsenate (CCA) has been the predominant wood preservative used in North America in recent years. The emission of volatile metals and leaching from the combustion ash of CCA-treated wood pose serious concerns. In this work, mineral sorbents were evaluated for their capabilities to control both problems. Results of thermodynamic analyses suggested that alkali and alkaline earth metal-based sorbents can potentially react with the metals during combustion. Experiments were conducted by mixing and burning mineral sorbents including lime and soda ash with CCA-treated wood in a fixed bed. Calcium-based sorbents showed great increase in the retention of arsenic (from 60 to 85%) and chromium (from 55 to 80%) and reduction in the leaching of arsenic (from 200 down to 0.1 mg/L) and copper (from 100 down to 1 mg/L). Sodium-based sorbents successfully retained metals in the ash below but the products were highly leachable (over 1000 mg/L). The speciation of the products plays a critical role in determining the fate of the metals.
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Information
Published In
Journal of Environmental Engineering
Volume 130 • Issue 2 • February 2004
Pages: 184 - 192
Copyright
Copyright © 2004 American Society of Civil Engineers.
History
Received: May 30, 2002
Accepted: Apr 24, 2003
Published online: Jan 16, 2004
Published in print: Feb 2004
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