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<p>This study addresses the challenges in sustainable wastewater treatment and energy recovery by producing biochar (BC) pellets from bioethanol industry wastes, namely cassava peel (CP), cassava residue (CR), and ash (A). The BC pellets were carbonized under anaerobic pyrolysis at 550&#xa0;°C for 2&#xa0;h and characterized using BET, SEM–EDS, FTIR, and XRD techniques. Their performance was evaluated for chemical oxygen demand (COD) and color removal, two key toxic characteristics of real industrial wastewater, while their higher heating values (HHV) were analyzed for potential energy recovery. The CP/CR/A (3) formulation was identified as the most effective biochar pellet, achieving high removal efficiencies for COD (65%) and color (78%) at optimal condition with the highest carbon content (55.65%) and superior adsorption affinity. Furthermore, the Langmuir model provided an excellent fit to the experimental data (R<sup>2</sup> &gt; 0.993). The biochar pellets also demonstrated modest heating values (2.82–6.7&#xa0;MJ/kg), indicating potential application in co-firing to supplement fossil fuels while promoting circular economy integration in the cassava-based bioethanol industry. Overall, cassava-derived BC pellets function as dual-purpose materials, serving both as effective adsorbents for wastewater detoxification and as low-grade energy carriers.</p>

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A sustainable model of transforming waste into biochar-based materials for industrial wastewater treatment and reuse as fuel in the bio-ethanol production process

  • 期刊论文

  • 发表日期：

    2025年10月1日

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  • Sompit Tantavoranart,
  • Kullaya Saricheewin,
  • Kirana Siriratsakul,
  • Vinita Khum-in

摘要

This study addresses the challenges in sustainable wastewater treatment and energy recovery by producing biochar (BC) pellets from bioethanol industry wastes, namely cassava peel (CP), cassava residue (CR), and ash (A). The BC pellets were carbonized under anaerobic pyrolysis at 550 °C for 2 h and characterized using BET, SEM–EDS, FTIR, and XRD techniques. Their performance was evaluated for chemical oxygen demand (COD) and color removal, two key toxic characteristics of real industrial wastewater, while their higher heating values (HHV) were analyzed for potential energy recovery. The CP/CR/A (3) formulation was identified as the most effective biochar pellet, achieving high removal efficiencies for COD (65%) and color (78%) at optimal condition with the highest carbon content (55.65%) and superior adsorption affinity. Furthermore, the Langmuir model provided an excellent fit to the experimental data (R2 > 0.993). The biochar pellets also demonstrated modest heating values (2.82–6.7 MJ/kg), indicating potential application in co-firing to supplement fossil fuels while promoting circular economy integration in the cassava-based bioethanol industry. Overall, cassava-derived BC pellets function as dual-purpose materials, serving both as effective adsorbents for wastewater detoxification and as low-grade energy carriers.