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<p>Global energy demand is increasing due to rapid urbanization, population growth, and industrialization, intensifying reliance on fossil fuels and environmental degradation. Biomass, particularly food waste, offers a sustainable renewable resource because of its abundance and high organic content. This study assesses anaerobic digestion of municipal food waste for biogas production and nutrient recovery at varying substrate loads (25–200&#xa0;g) under neutral pH conditions. Results showed that higher organic loading significantly enhanced biogas and methane yields, with the 200&#xa0;g reactor producing nearly nine times more biogas than the 25&#xa0;g system. Methane concentrations of 65–70% were achieved at higher loads, indicating efficient conversion without inhibition. Digestate analysis revealed increased nitrogen, phosphorus, and potassium contents, demonstrating its potential as a biofertilizer, though elevated electrical conductivity suggests the need for controlled application. Overall, anaerobic digestion proved to be an effective waste-to-energy and nutrient-recycling approach supporting circular economy goals.</p>

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Valorization of food waste and sawdust for biogas production through anaerobic digestion

  • 期刊论文

  • 发表日期：

    2026年3月2日

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  • Saikat Banerjee,
  • Naveen Prasad,
  • Rakesh Namdeti,
  • P Kanakasabai,
  • Saeed Ghanim Ali Alawaid,
  • Halla Ghazi Al-Amri

摘要

Global energy demand is increasing due to rapid urbanization, population growth, and industrialization, intensifying reliance on fossil fuels and environmental degradation. Biomass, particularly food waste, offers a sustainable renewable resource because of its abundance and high organic content. This study assesses anaerobic digestion of municipal food waste for biogas production and nutrient recovery at varying substrate loads (25–200 g) under neutral pH conditions. Results showed that higher organic loading significantly enhanced biogas and methane yields, with the 200 g reactor producing nearly nine times more biogas than the 25 g system. Methane concentrations of 65–70% were achieved at higher loads, indicating efficient conversion without inhibition. Digestate analysis revealed increased nitrogen, phosphorus, and potassium contents, demonstrating its potential as a biofertilizer, though elevated electrical conductivity suggests the need for controlled application. Overall, anaerobic digestion proved to be an effective waste-to-energy and nutrient-recycling approach supporting circular economy goals.