PROCESS FOR DECONTAMINATING PRESERVATIVE-TREATED WOOD AND RECOVERING METALS FROM LEACHATES
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United States of America Patent
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Issued Date -
May 12, 2011
app pub date -
Apr 8, 2009
filing date -
Apr 8, 2008
priority date (Note) -
Abandoned
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Abstract
Described is a process for decontaminating wood treated with preservative such as chromium copper arsenate (CCA) including contacting the contaminated wood with water and inorganic acid at a concentration between 0.05 and 0.8 N at less than 100° C. to leach out the contaminants and then separate the wood from the solution. Also described is a process for extracting metals such as copper from a solution containing chromium, copper and arsenic, such as the leachate solution used to decontaminate CCA-treated wood, by precipitation using a coagulant at a pH favoring precipitation of arsenic and continued solubility of copper, or by ion exchange resins.
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