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Evaluation of Integrated Anaerobic Digestion and Hydrothermal Carbonization for Bioenergy Production
Published on: June 15, 2014
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Hydrochar production from defective coffee beans by hydrothermal carbonization
Mozarte Santos Santana1, Rafael Pereira Alves1, Willian Miguel da Silva Borges1
1Department of Chemistry, Federal University of Lavras, 37200-900 Lavras, MG, Brazil.
Bioresource Technology
|January 6, 2020
Summary
Researchers converted defective coffee beans into valuable hydrochars, a type of solid biofuel. Hydrothermal carbonization effectively enhanced the energy density and fuel properties of these coffee waste materials.
Area of Science:
- Biomass conversion
- Renewable energy
- Materials science
Background:
- Coffee processing generates significant waste, including defective beans.
- Valorization of agricultural waste is crucial for sustainable energy production.
- Hydrothermal carbonization (HTC) is a promising thermochemical conversion pathway.
Purpose of the Study:
- To produce hydrochars from defective coffee beans.
- To characterize the physical and chemical properties of the synthesized hydrochars.
- To evaluate the potential of hydrochars as solid biofuels.
Main Methods:
- Defective coffee beans were subjected to hydrothermal carbonization at 150, 200, and 250 °C for 40 minutes.
- The resulting hydrochars were recovered via filtration.
- Characterization involved CHNO-S analysis, thermogravimetric analysis (TGA), and differential scanning calorimetry (DSC).
Main Results:
- Hydrothermal carbonization temperature significantly influenced the energy values and fuel properties of the hydrochars.
- The synthesized hydrochars exhibited characteristics suitable for solid fuel applications.
- Higher HTC temperatures generally led to improved fuel properties.
Conclusions:
- Hydrothermal carbonization is an effective and straightforward method for converting coffee bean waste into functional solid biofuels.
- The process yields energy-dense hydrochars with potential for commercial application.
- This approach contributes to waste valorization and the development of sustainable energy sources.
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