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Biochemical methane potential of coyol fruit as a substrate for biogas production through mixture design and kinetic modeling
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DOI：10.1016/j.biombioe.2024.107571.png)
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Abstract
En 中文
The coyol fruit, a species with high but underexplored energy potential, represents a renewable and sustainable alternative for biogas production. Using a mixture design, the study evaluates the Biochemical Methane Potential (BMP) of its components: peel, pulp, and seed. The methodology included physicochemical characterization (total solids-TS, volatile solids-VS), elemental analysis, and Fourier Transform Infrared Spectroscopy (FTIR) to determine biodegradability and chemical composition. The results showed a VS/TS ratio above 85 % in all components, indicating high biodegradability. The C/N ratio varied significantly, with values of 241.47 for the peel, 62.67 for the seed, and 24.41 for the pulp, emphasizing the need for an optimized mixture to balance nutrients. FTIR analysis identified lignocellulosic compounds in the peel and carbohydrates, lipids, and proteins in the pulp and seed, supporting their potential for biogas production. The highest methane yield was 369.06 Nml CH4/g VS in Run 9 with 66.67 % peel, 16.67 % pulp, and 16.67 % seed, achieving a methane content of 57.44 %. Pulp alone yielded 268.49 Nml CH4/g VS and 54 % methane, while the other assays yielded less than 200 Nml CH4/g VS. Kinetic modeling using a first-order equation showed R2 above 95 % and k values between 0.01 and 0.12, confirming efficient degradation. In conclusion, the optimized combination of coyol fruit components demonstrates significant potential for biogas production. Future research should explore pretreatment methods and process scalability to facilitate industrial integration into biorefinery systems for renewable energy generation.
Keywords:
Biochemical methane potential
Biogas production
Anaerobic digestion
Coyol fruit
Mixture optimization
First-order kinetics
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