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Faisabilité du recyclage en boucle fermée des déchets post-consommateurs en bois massif

Abstract : The forestry-wood sector is increasingly integrating the issues of circularity (resources, economy, environment), and the European hierarchy of waste treatment methods requires that complementary recovery routes for post-consumer waste are investigated. This work evaluates the technical, economic and environmental feasibility of closed-loop recycling of solid wood waste. The characterization of Class B wood waste (not pressure-treated) obtained from recycling centres indicates the potential of manufacturing glued laminated joinery planks. An industrial process for homogenizing the properties has been developed and tested, which includes: purging of metals, decontamination and cutting to lamellae, purging of defects, finger-jointing and laminating the slats to make laminated products. It is demonstrated that removing 2 mm from the surface permits the production of lamellae that have contamination levels lower than the limits used by the particleboard sector. The material yield of lamellae was optimized using a numerical model, then validated and completed by experimentation on the whole process at the pilot scale (a 30 % yield is obtained for products matching class J30 made of 20 mm × 60 mm lamellae). Mechanical tests showed properties similar to the reference values for classes C30 or GL24h and no influence of aging was observed. A life-cycle analysis has shown that this process is environmentally favourable with respect to landfilling, panel recycling, and medium-term energy recovery, and that it can be as economically favourable as energy generation.
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  • HAL Id : tel-02505337, version 1

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François Privat. Faisabilité du recyclage en boucle fermée des déchets post-consommateurs en bois massif. Génie des procédés. École centrale de Nantes, 2019. Français. ⟨NNT : 2019ECDN0043⟩. ⟨tel-02505337⟩

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