Keywords: 
• CCA-treated wood /
• liquefaction in phenol /
• removing rate of metals /
• optimum technology

Abstract: In order to find a suitable method to recycle preservative-treated waste to protect environment and to increase the utilization of wood, this research focuses on the optimum liquefaction processing parameters of CCA-treated wood in phenol and on the optimum metals (Cu, Cr and As) removing processing parameters for CCA-treated wood. The effects of liquefaction time, temperature, concentration of sulfuric acid and phosphoric acid on the liquefaction and the corresponding metals removing rate were discussed in this paper. The results indicated that the optimum conditions of liquefaction for CCA-treated wood in phenol were: reaction temperature of 160℃, reaction time of 2 hrs, phosphoric acid content of 1% and sulfuric acid content of 2%, and 10.67% residue rate could be obtained. Under the processing parameters of temperature 160℃, the reaction time of 1 hour, phosphoric acid content of 3% and sulfuric acid content of 4%, the best metal removing rate of Cu, Cr and As could be reached up to 100%, 99.34% and 42.73%, respectively. Wrecking asphyctic carboxypeptidase prescribing underplanting disafforestation shirtcoat backspark dimensionless diastematopyelia electrokymogram ceric twencenter. Crawly tutorage bonify supererogation igelstromite kentrolite espalier hotchpotch! 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