Abstract
This study aims to improve a decontamination process developed for chromated copper arsenate (CCA)-treated wood waste. This process included metal extraction from the wood by a sulphuric acid-leaching step, and the treatment of metal-loaded leachate by precipitation with ferric chloride and sodium hydroxide. This study showed that sodium hydroxide can be advantageously replaced by calcium hydroxide to enhance performance (>99% metal precipitation above pH 6.5 with Ca(OH)2 and above pH 7 with NaOH) and lower chemical costs [US$30.8/ton of treated wood (TTW) with Ca(OH)2 instead of US$50.83TTW with NaOH]; however sludge production and sludge disposal cost were higher when using Ca(OH)2 for precipitation. Moreover, this study investigated the possibility of recycling the final process effluent obtained after metallic sludge separation. This effluent was successively reused in the process for the leaching step. Five recycling loops comprised of one leaching step, one precipitation step of the leachate with Ca...
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