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<p>Anaerobic co-digestion enhances biogas yield due to the synergistic effect of combined substrates. This study aimed to optimize the biogas production potential through anaerobic co-digestion of food waste and banana stems based on characterization approaches. Lab-scale batch experiments were conducted using five ratio combinations with replications over 45&#xa0;days at 37 ± 1&#xa0;°C. Daily biogas yield was measured using the water displacement method, while methane content in the biogas was determined using alkaline absorption followed by downward displacement methods. Moreover, optimal operational conditions were investigated using the Box–Behnken Design via Response Surface Methodology in Design Expert software. Food waste contained 50.72% carbohydrates and 9.81% protein, whereas banana stems comprised 29.03% cellulose and 8.53% lignin. The high carbohydrate content of food waste and the low lignin content of banana stems highlight their potential for biogas production. Co-digestion resulted in enhanced methanogenic activity due to a well-balanced carbon-to-nitrogen (C/N) ratio. The longest retention time for cumulative biogas production was observed in R1 (100% banana stems) at 41&#xa0;days, while the shortest was in R5 (100% food waste) at 25&#xa0;days. Biogas yields of food waste, banana stems, and their 1:1 co-digestion were 304.90&#xa0;mL/gVS, 216.60&#xa0;mL/gVS, and 330.18&#xa0;mL/gVS, respectively. Therefore, the study could have a significant contribution to the efforts of maximizing renewable energy production from food waste and banana stems. Subsequently, the findings indicate that co-digestion provides better yields due to nutrient balance and optimal pH, promoting an efficient anaerobic digestion process. </p>

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Optimization of biomethane production from anaerobic co-digestion of food waste and banana stems: a characterization-based approach

  • 期刊论文

  • 发表日期：

    2025年6月23日

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  • W. H. Debele,
  • D. D. Keche,
  • A. C. Wachemo,
  • T. D. Wanore,
  • H. A. Legesse

摘要

Anaerobic co-digestion enhances biogas yield due to the synergistic effect of combined substrates. This study aimed to optimize the biogas production potential through anaerobic co-digestion of food waste and banana stems based on characterization approaches. Lab-scale batch experiments were conducted using five ratio combinations with replications over 45 days at 37 ± 1 °C. Daily biogas yield was measured using the water displacement method, while methane content in the biogas was determined using alkaline absorption followed by downward displacement methods. Moreover, optimal operational conditions were investigated using the Box–Behnken Design via Response Surface Methodology in Design Expert software. Food waste contained 50.72% carbohydrates and 9.81% protein, whereas banana stems comprised 29.03% cellulose and 8.53% lignin. The high carbohydrate content of food waste and the low lignin content of banana stems highlight their potential for biogas production. Co-digestion resulted in enhanced methanogenic activity due to a well-balanced carbon-to-nitrogen (C/N) ratio. The longest retention time for cumulative biogas production was observed in R1 (100% banana stems) at 41 days, while the shortest was in R5 (100% food waste) at 25 days. Biogas yields of food waste, banana stems, and their 1:1 co-digestion were 304.90 mL/gVS, 216.60 mL/gVS, and 330.18 mL/gVS, respectively. Therefore, the study could have a significant contribution to the efforts of maximizing renewable energy production from food waste and banana stems. Subsequently, the findings indicate that co-digestion provides better yields due to nutrient balance and optimal pH, promoting an efficient anaerobic digestion process.