Enhancing biogas production from co-digestion of organic wastes mixed with cattle manure using rumen fluid and Saccharomyces cerevisiae isolate MUTJ0F
Résumé
Background Biogas production from different types of biodegradable waste is an alternative to fossil fuels for energy consumption and biodegradable waste management. Biogas is a cost-effective, environmentally friendly, and sustainable energy source that provides a reliable method for handling food waste. Methods This study evaluated the effects of rumen fluid and S. cerevisiae isolate MUTJ0F as fermentation activators on biogas production from the co-digestion of cattle manure, fruit and vegetable residues, and cafeteria food waste at Debre Markos University in Ethiopia. Under mesophilic conditions, 12 treatments with different rumen fluid (0–150 ml/100 g) and S. cerevisiae isolate MUTJ0F inoculum (5–10 ml/100 g) dosages were assessed. Biogas was produced from mixed waste using plastic digesters (0.6 L) at mesophilic temperature (30°C) after the 60-day retention period. Standard techniques were used to measure the physicochemical characteristics of the mixed waste, such as pH, total solids, volatile solids, organic carbon, and moisture. This study was conducted experimentally using factorial patterns and a completely randomized 6 × 2 design. The water displacement method was used to estimate the average amount of biogas generated by a 0.6 L digester. Result Rumen fluid with S. cerevisiae isolate MUTJ0F increased biogas generation by more than four times compared to the uninoculated control. The combination of 100 ml rumen fluid and 10 ml S. cerevisiae isolate MUTJ0F per 100 g of mixed waste produced the highest volume of biogas (6900.3 ml). pH monitoring revealed normal acidogenesis followed by a gradual return to methanogenic conditions, while combustibility tests showed the presence of methane in the biogas. Conclusion These results suggest that using rumen fluid and the S. cerevisiae isolate MUTJ0F as inoculants in a biogas digester can enhance methane production and biodegradation efficiency.
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