title: Demonstration of the efficiency and robustness of an acid leaching process to remove metals from various CCA-treated wood samples.
abstract: In recent years, an efficient and economically attractive leaching process has been developed to remove metals from copper-based treated wood wastes. This study explored the applicability of this leaching process using chromated copper arsenate (CCA) treated wood samples with different initial metal loading and elapsed time between wood preservation treatment and remediation. The sulfuric acid leaching process resulted in the solubilization of more than 87% of the As, 70% of the Cr, and 76% of the Cu from CCA-chips and in the solubilization of more than 96% of the As, 78% of the Cr and 91% of the Cu from CCA-sawdust. The results showed that the performance of this leaching process might be influenced by the initial metal loading of the treated wood wastes and the elapsed time between preservation treatment and remediation. The effluents generated during the leaching steps were treated by precipitation-coagulation to satisfy the regulations for effluent discharge in municipal sewers. Precipitation using ferric chloride and sodium hydroxide was highly efficient, removing more than 99% of the As, Cr, and Cu. It appears that this leaching process can be successfully applied to remove metals from different CCA-treated wood samples and then from the effluents.
authors: Institut national de la recherche scientifique (Centre Eau, Terre et Environnement), Université du Québec, 490 rue de la Couronne, Québec, Canada, G1K 9A9. Electronic address: lucie.coudert@ete.inrs.ca.
authors: Lucie
authors: L
authors: Coudert
authors: Institut national de la recherche scientifique (Centre Eau, Terre et Environnement), Université du Québec, 490 rue de la Couronne, Québec, Canada, G1K 9A9. Electronic address: blaisjf@ete.inrs.ca.
authors: Jean-François
authors: JF
authors: Blais
authors: Institut national de la recherche scientifique (Centre Eau, Terre et Environnement), Université du Québec, 490 rue de la Couronne, Québec, Canada, G1K 9A9. Electronic address: guy.mercier@ete.inrs.ca.
authors: Guy
authors: G
authors: Mercier
authors: University of Toronto, Faculty of Forestry, 33 Willcocks St., Toronto, ON, Canada, M5S 3B3. Electronic address: p.cooper@utoronto.ca.
authors: Paul
authors: P
authors: Cooper
authors: University of Toronto, Faculty of Forestry, 33 Willcocks St., Toronto, ON, Canada, M5S 3B3. Electronic address: amelie.janin@ete.inrs.ca.
authors: Amélie
authors: A
authors: Janin
authors: IREQ, 1800 boul. Lionel-Boulet, Varennes, QC, J3X 1S1, Canada. Electronic address: gastonguay.louis@ireq.ca.
authors: Louis
authors: L
authors: Gastonguay
mesh_terms: D001149:Arsenates / Q000737:chemistry*; D011232:Chemical Precipitation; D004785:Environmental Pollutants / Q000737:chemistry*; D052918:Environmental Restoration and Remediation / Q000379:methods*; D012037:Refuse Disposal / Q000379:methods*; D013464:Sulfuric Acids / Q000737:chemistry*; D014934:Wood / Q000737:chemistry*
chemical_list: D001149:Arsenates; D004785:Environmental Pollutants; D013464:Sulfuric Acids; C040890:chromated copper arsenate; C033158:sulfuric acid
keywords: Acid leaching; Chemical leaching process; Chromated copper arsenate; Metal removal; Precipitation; Treated wood