ORIGINAL RESEARCH article
Front. Energy Res.
Sec. Bioenergy and Biofuels
Volume 13 - 2025 | doi: 10.3389/fenrg.2025.1568478
Optimization of biogas production through co-digestion of cafeteria food waste and cow dung using response surface methodology
Provisionally accepted
- Wachemo University, Hosaena, SNNPR, Ethiopia
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Biogas, a renewable energy, is produced by the anaerobic digestion of organic materials into methane-rich combustible gas. In this context, this study evaluated biogas production from cafeteria food waste (CFW) and cow dung (CD) via co-digestion under mesophilic conditions using a batch digester. To assess the effectiveness of the process, key physicochemical parameters, including total solids, volatile solids, moisture content, carbonto-nitrogen ratio, and pH, were determined before and after digestion. Furthermore, optimization of biogas production was performed using response surface methodology with a three-factor, three-level Box-Behnken design to analyze the effects of CFW-to-CD ratio, pH, and temperature. Accordingly, seventeen experimental runs were conducted in triplicate, and the optimal conditions were determined to be a CFW-to-CD ratio of 3, at pH 7.0 and 37.5°C, which yielded the highest biogas production of 197 mL with 62.5% methane. These findings suggest that the co-digestion of CFW and CD holds significant potential for enhancing biogas yield and methane composition. Therefore, this approach offers an efficient and sustainable solution for renewable energy production, effectively transforming organic waste into a beneficial energy resource.
Keywords: Biogas, Co-digestion, Cow dung, Cafeteria food waste, Methane, optimization, Response Surface Methodology
Received: 29 Jan 2025; Accepted: 27 May 2025.
Copyright: © 2025 Bidiko, Belay and Gnaro. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
* Correspondence: Mikiyas Abewaa Gnaro, Wachemo University, Hosaena, SNNPR, Ethiopia
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