TUDIES ON PROPER TREATMENT AND RECYCLING SYSTEM FOR CCA-TREATED WOOD WASTE - FACT-FINDING SURVEY FOR DEMOLISHERS AND RECYCLING COMPANIES AND EXPERIMENTS FOR REMOVAL TECHNIQUE OF CCA COMPONENTS -

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  • 廃CCA処理木材の適正処理・資源化システム構築に関する研究～解体・再資源化業者への実態調査とCCA成分除去法の実験的検討～

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Systematic investigations were performed in order to establish a proper treatment and recycling system for CCA-treated wood waste. At first, a fact-finding survey on separation of CCA-treated wood waste was conducted by questionnaire for demolishers, sampling and analysis for samples of recycled material, and literature survey. The result estimated that about 71% of CCA-treated wood waste was not separated, and that the detected CCA components in the samples were over the level which might cause hazardous effects. In addition, we also pointed out the problems on incineration or landfilling of CCA-treated wood waste which are recognized proper treatments at the present time, and suggested the necessity for thorough separation and recycling system of CCA-treated wood waste. So, assuming fully separation of CCA-treated wood waste, extracting conditions using dilute sulfuric acid were investigated for removal of CCA-components from CCA-treated wood waste. As the result, about 90% of CCA-components were removed from CCA-treated wood chips with 0.5NH2SO4 under 50°C for 8hours, suggesting possibility of reasonable recycling of wood material and metal components.

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