Liquefaction of CCA-treated wood and elimination of metals from the solvent by precipitation

Lianzhen Lin; Chung-Yun Hse

doi:10.1515/hf.2005.047

Treesearch

Liquefaction of CCA-treated wood and elimination of metals from the solvent by precipitation

Informally Refereed

Authors:

Lianzhen Lin, Chung-Yun Hse

Year:

2005

Type:

Scientific Journal

Station:

Southern Research Station

DOI:

https://doi.org/10.1515/hf.2005.047

Source:

Holzforschung, Vol. 59, pp. 285-288

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Abstract

Spent chromated copper arsenate (CCA)-treated wood was liquefied in polyethylene glycol 400/glycerin (2:1 w/w). Sulfuric acid (95-98%) and ferrous salts (FeSO₄•7H₂O or FeCl₂•4H₂O) were used as catalysts and additives, respectively. The resulting liquefied CCA-treated wood was diluted with aqueous solvents and was then mixed with complexion/precipitation agents, followed by precipitation or filtration to remove the toxic metal-bearing sediment. As a result, more than 90% of Cu, Cr or As was removed.

Keywords

Chromated copper arsenate, detoxification, inductively coupled plasma, recycling, treated wood, wood liquefaction

Citation

Lin, Lianzhen; Hse, Chung-Yun. 2005. Liquefaction of CCA-treated wood and elimination of metals from the solvent by precipitation. Holzforschung, Vol. 59, pp. 285-288