Abstract
In this study, chromated copper arsenate-treated wood (CCA-W) and alkaline copper quaternary compounds-treated wood (ACQ-W) were subjected to fast pyrolysis at 500°C for ca. 2s to produce bio-oil and char. The physicochemical properties of the pyrolytic products as well as the distribution of heavy metals – arsenic, copper and chrome – during fast pyrolysis were investigated. The water content, viscosity, pH and higher heating value (HHV) of bio-oil from CCA-W were 24.8wt%, 13.5cSt, 2.1 and 16MJ/kg, respectively, whereas those of bio-oil from ACQ-W were 27.9wt%, 16cSt, 3.0 and 14.1MJ/kg, respectively. The yields of bio-oil from CCA-W and ACQ-W were 43.3% and 46.6%, respectively, significantly lower than that of control (61.6%). In the pyrolytic products of CCA-W, the concentrations of arsenic, copper and chromium were determined to be 36.4wt%, 74.0wt% and 75.4wt% in char, respectively, 34.5wt%, 10.3wt% and 9.0wt% in bio-oil, respectively, and 29.0wt%, 15.7wt% and 15.5wt% in gas, respectively. In addition, most of the copper appeared in the char (98.8wt%) and only a trace amount of copper was detected in the bio-oil (0.2wt%) produced by ACQ-W.
Published Version
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