Optimization of Biogas Production from Co-Digestion of Sugarcane Trash Blended with Sugarcane Vinasse

Abstract

Biogas, a critical form of biofuel, is produced through the anaerobic digestion of biomass. This process not only provides renewable energy and fertilizer but also reduces greenhouse gas emissions and repurposes agricultural and industrial waste. Co-digesting sugarcane trash with sugarcane vinasse has the potential to enhance biogas production while mitigating environmental impacts. However, the technical feasibility of this blend and its potential biogas yield from pre- and post-treatment processes require further validation. This study aimed to optimize biogas production by co-digesting sugarcane trash and vinasse. Feedstock characterization showed an optimal carbon-to-nitrogen ratio and adequate moisture content, confirming its suitability for anaerobic digestion. Using an orthogonal array design, the study optimized parameters such as mixed ratios, temperature, and retention time. The optimal conditions for biogas production were identified as a 2:1 sugarcane trash-to-vinasse ratio, a temperature of 45°C, and a retention time of 20 days, significantly improving biogas yield. Analysis revealed that nitrogen and hydrogen from vinasse were crucial for enhancing methane production. Proximate analysis confirmed the low ash content and high volatile matter in sugarcane trash, making it ideal for biogas production. The study recommends managing moisture levels, selecting low-sulfur feedstock blends, and further research on microbial optimization and sustainability assessments for commercial-scale biogas production