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Pyrolysis of Chromated Copper Arsenate-Treated Wood: Investigation of Temperature, Granulometry, Biochar Yield, and Metal Pathways

Author

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  • Mouna Gmar

    (Forest Research Institute, Université du Québec en Abitibi-Témiscamingue, 445 Boul. University, Rouyn-Noranda, QC J9X 5E4, Canada)

  • Hassine Bouafif

    (Centre Technologique des Résidus Industriels (CTRI), Rouyn-Noranda, QC J9X 5E5, Canada)

  • Besma Bouslimi

    (Forest Research Institute, Université du Québec en Abitibi-Témiscamingue, 445 Boul. University, Rouyn-Noranda, QC J9X 5E4, Canada)

  • Flavia L. Braghiroli

    (Forest Research Institute, Université du Québec en Abitibi-Témiscamingue, 445 Boul. University, Rouyn-Noranda, QC J9X 5E4, Canada
    Centre Technologique des Résidus Industriels (CTRI), Rouyn-Noranda, QC J9X 5E5, Canada)

  • Ahmed Koubaa

    (Forest Research Institute, Université du Québec en Abitibi-Témiscamingue, 445 Boul. University, Rouyn-Noranda, QC J9X 5E4, Canada)

Abstract

Chromated copper arsenate-treated (cca) wood disposal faces environmental restrictions due to its toxicity, heavy metal leaching in storage sites, and greenhouse gas emissions during incineration. Thus, finding new management methods for this contaminated wood at the end of life is crucial. This study evaluated the effect of pyrolysis temperature (300, 400, and 500 °C), particle size, biochar yield, and the behavior of arsenic (As), chromium (Cr), and copper (Cu) during treated-wood pyrolysis. The highest biochar yield was obtained at 300 °C for fine particles. The biochar retention of heavy metals decreased with increasing pyrolysis temperature. At 300 °C, the highest biochar As, Cr, and Cu retentions were 76, 91, and 83%. At 500 °C, biochar only retained 43% of the As. Additionally, heavy metal leaching from the biochar exceeded the Environmental Protection Agency’s (EPA) maximum concentration limit of 5 mg/L. High-density polyethylene encapsulation of contaminated biochar reduced the leaching of As, Cr, and Cu by 96, 95, and 91%, respectively. Thus, combining pyrolysis and plastic encapsulation to produce a composite material could be a solution for reducing waste (conversion of CCA-wood into biochar) and for the safe disposal of contaminated wood.

Suggested Citation

  • Mouna Gmar & Hassine Bouafif & Besma Bouslimi & Flavia L. Braghiroli & Ahmed Koubaa, 2022. "Pyrolysis of Chromated Copper Arsenate-Treated Wood: Investigation of Temperature, Granulometry, Biochar Yield, and Metal Pathways," Energies, MDPI, vol. 15(14), pages 1-15, July.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:14:p:5071-:d:860596
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