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<p>Construction wood waste (CWW) is an increasing environmental burden due to poor disposal and limited recycling. This study developed an integrated process to convert CWW into biochar, soot and ash using a top-lit updraft (TLUD) reactor. The process used CWW as both feedstock and fuel, operating at a peak temperature of 351.2 ℃ for 150&#xa0;min. The resulting materials exhibited distinct physicochemical properties. FTIR analysis identified hydroxyl, carbonyl and aromatic groups across all samples. SEM revealed irregular porous particles in ash, fine agglomerated particles in soot and well-defined micro- and mesopores in biochar. XRF analysis showed that biochar and ash contained over 60 wt% calcium oxide, while soot contained 35 wt% iron oxide. BET analysis indicated that soot possessed the highest surface area of 229.057 m<sup>2</sup>/g and a pore volume of 0.151 cm<sup>3</sup>/g. The study demonstrated an efficient and sustainable approach for producing multiple carbon-based materials from construction waste. The biochar, soot and ash produced have potential applications in pollutant adsorption, catalysis, energy storage and soil improvement. This work emphasizes the value of TLUD technology in reducing construction waste and advancing circular resource management.</p>

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Integrated production of biochar, soot and ash from construction wood waste in a single reactor system

  • 期刊论文

  • 发表日期：

    2025年11月28日

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  • Adewale George Adeniyi,
  • Ghadah M. Al-Senani,
  • Salhah D. Al-Qahtani,
  • Kingsley O. Iwuozor,
  • Ebuka Chizitere Emenike,
  • Abel U. Egbemhenghe

摘要

Construction wood waste (CWW) is an increasing environmental burden due to poor disposal and limited recycling. This study developed an integrated process to convert CWW into biochar, soot and ash using a top-lit updraft (TLUD) reactor. The process used CWW as both feedstock and fuel, operating at a peak temperature of 351.2 ℃ for 150 min. The resulting materials exhibited distinct physicochemical properties. FTIR analysis identified hydroxyl, carbonyl and aromatic groups across all samples. SEM revealed irregular porous particles in ash, fine agglomerated particles in soot and well-defined micro- and mesopores in biochar. XRF analysis showed that biochar and ash contained over 60 wt% calcium oxide, while soot contained 35 wt% iron oxide. BET analysis indicated that soot possessed the highest surface area of 229.057 m2/g and a pore volume of 0.151 cm3/g. The study demonstrated an efficient and sustainable approach for producing multiple carbon-based materials from construction waste. The biochar, soot and ash produced have potential applications in pollutant adsorption, catalysis, energy storage and soil improvement. This work emphasizes the value of TLUD technology in reducing construction waste and advancing circular resource management.