Recovery of copper chromium and arsenic from old CCA treated commodities

IRG/WP 98-50118

D P Kamdem, Wanli Ma, Jun Zhang, J Zyskowski

Due to the expected increase in spent treated wood over the next several decades, numerous means to reuse and recycle preserved wood have been proposed. Burning this wood for cogeneration or recycling of CCA treated wood into reconstituted composites are possible methods, but they are limited to laboratory scale because of environmental air emission issues and the manufacturing process. In the available literature, laboratory removal of CCA from treated wood has been conducted on 20 mesh size particles or saw dust. This approach requires chipping and grinding of lumber and poles into particles and saw dust. In the current study, about 95 to 100% copper, chromium, and arsenic were removed from 2 by 4's and pole sections without substantial modification of initial sample size. This extraction yield was obtained within 18 hours at temperatures ranging from 80- 100EC using a combination of citric acid and chelating agent at pH 4.


Conference: 98-06-14/19 Maastricht, The Low Countries

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