Environmental problems caused by the toxicity of metallic elements of the preservative occur when treated wood comes to end of use. In the experiment, CCB treated wood chips were pyrolysed at various temperatures and residence times and the behaviour of boron, chromium and copper was observed. The three elements are almost entirely retained in the charcoal. There is no influence of final temperature and residence time on the chromium and copper retention (% weight). For temperature higher than 300 °C, a 15 % loss of boron relatively to copper is observed when the residence time goes from 15 to 30 minutes.

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