Waste valorization through anaerobic co-digestion in coffee and swine farms: CH4 yield optimization and farm-scale viability
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View abstract on PubMed
Summary
This summary is machine-generated.Optimizing methane (CH4) yield from co-digesting swine manure and coffee waste involved adjusting coffee wastewater percentage and organic matter concentration. The best conditions maximized biogas production and efficiency.
Area Of Science
- Agricultural Engineering
- Environmental Science
- Biotechnology
Background
- Agricultural farms in Brazil's southeast produce significant coffee and swine waste.
- These wastes possess complementary characteristics suitable for co-digestion.
- Anaerobic co-digestion offers a sustainable method for waste management and energy production.
Purpose Of The Study
- To optimize methane (CH4) yield through batch anaerobic co-digestion.
- To investigate the co-digestion of liquid swine manure (LSM), coffee wastewater (CFW), and coffee husk/pulp.
- To determine the ideal conditions for maximizing biogas production and efficiency.
Main Methods
- Utilized a two-factor central composite rotational design for optimization.
- Varied CFW percentage (8-22%) and organic matter concentration (0.3-12 gCOD L-1).
- Analyzed methane production, yield, specific production rate, and lag phase.
Main Results
- Identified optimal conditions: 14% CFW, 86% LSM, 7.3 gCOD L-1, and a COD/N ratio of 35.
- Achieved high methane production (971.7 mLCH4) and yield (160.9 mLCH4 g-1VS).
- Observed a maximum specific production rate of 1.6 mL h-1 and a short lag phase (217.6 h).
Conclusions
- The optimized co-digestion of LSM and CFW enhances methane yield.
- Nutritional balance (COD/N ratio) is crucial for efficient biogas production.
- This study provides a viable strategy for bioenergy generation from agricultural waste.
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