Extraction of Chrome, Copper, and Arsenic Compounds from Waste Preservative-Treated Wood

概要

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Preservative-treated wood with chromated copper arsenate (CCA) has been used for 50 years in the world because of its reliability in preventing damage by insects or microorganisms. However, if this treated wood is waste and is incinerated, it will cause serious problems, in that incineration gas is discharged with high concentration of arsenic compounds, and the ash residue contains a lot of copper, chrome, and arsenic compounds.<BR>In this paper, a series of extraction experiments was carried out to remove these hazardous materials from preservative-treated wood. Through the experiments, suitable conditions were obtained as follows;<BR>1) suitable extractant is 0.25N sulfuric acid.<BR>2) suitable temperature ranges between 90°C and 100°C. Moreover, the relationships between extraction time, extracted amount of TOC, and wood tip size were obtained.
一般社団法人廃棄物資源循環学会の論文