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<p>To fully utilize the potential of fruit peel and develop an efficient CO<sub>2</sub> adsorbent, this study investigated the anaerobic digestion of shaddock peel (SP) for methane production and the subsequent conversion of the digestate into biochar. The results demonstrated that KOH pretreatment significantly enhanced the methane production of SP, increasing by nearly tenfold to 355.06 L/kgVS. Anaerobic digestion optimized the lignocellulosic structure of SP and facilitated pore development of biochar during the pyrolysis process. The specific surface area and micropore volume of the prepared biochar significantly increased, reaching 426.09 m<sup>2</sup>/g and 0.1990 cm<sup>3</sup>/g, respectively, representing an 18-fold and 19-fold enhancement. The CO<sub>2</sub> adsorption capacity of the biochar derived from anaerobic digestion reached 135.18 mg/g (273.15 K, 1 bar), marking a 59% increase compared to biochar without anaerobic digestion. The CO<sub>2</sub> adsorption capacity of biochar was influenced by its pore structure and adsorption temperature, with micropores and lower temperatures being particularly favorable for enhanced adsorption performance. Cyclic adsorption experiments demonstrated that the biochar retained a high adsorption capacity, maintaining 97.70% to 99.01% of its initial performance after 10 consecutive adsorption-desorption cycles. In summary, the preparation of biochar through anaerobic digestion of SP simultaneously enables methane production and adsorbent development. This approach offers multiple benefits, including energy generation, environmental protection, and carbon neutrality, representing an ingenious strategy for the sustainable utilization of fruit peel.</p>

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Anaerobic Digestion Enhances the Comprehensive Utilization of Shaddock Peel: Methane Production, Biochar Preparation, and CO2 Capture

  • 期刊论文

  • 发表日期：

    2025年6月3日

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  • Chengcheng Cao,
  • Ru Li,
  • Huantao Dai,
  • Yan Zhao,
  • Ling Sun,
  • Xinheng Zhuang,
  • Xueyang Zhang

摘要

To fully utilize the potential of fruit peel and develop an efficient CO2 adsorbent, this study investigated the anaerobic digestion of shaddock peel (SP) for methane production and the subsequent conversion of the digestate into biochar. The results demonstrated that KOH pretreatment significantly enhanced the methane production of SP, increasing by nearly tenfold to 355.06 L/kgVS. Anaerobic digestion optimized the lignocellulosic structure of SP and facilitated pore development of biochar during the pyrolysis process. The specific surface area and micropore volume of the prepared biochar significantly increased, reaching 426.09 m2/g and 0.1990 cm3/g, respectively, representing an 18-fold and 19-fold enhancement. The CO2 adsorption capacity of the biochar derived from anaerobic digestion reached 135.18 mg/g (273.15 K, 1 bar), marking a 59% increase compared to biochar without anaerobic digestion. The CO2 adsorption capacity of biochar was influenced by its pore structure and adsorption temperature, with micropores and lower temperatures being particularly favorable for enhanced adsorption performance. Cyclic adsorption experiments demonstrated that the biochar retained a high adsorption capacity, maintaining 97.70% to 99.01% of its initial performance after 10 consecutive adsorption-desorption cycles. In summary, the preparation of biochar through anaerobic digestion of SP simultaneously enables methane production and adsorbent development. This approach offers multiple benefits, including energy generation, environmental protection, and carbon neutrality, representing an ingenious strategy for the sustainable utilization of fruit peel.