Determination of Relationship between Higher Heating Value and Atomic Ratio of Hydrogen to Carbon in Spent Coffee Grounds by Hydrothermal Carbonization

This study was a preliminary investigation of solid recovered fuel production from spent coffee grounds using the hydrothermal carbonization (HTC) technique. The spent coffee grounds (SCGs) were subjected to HTC at 170 to 250 °C. The biochar was characterized by proximate analysis, ultimate analysis...

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Bibliographic Details
Published in:Energies (Basel) 2021-10, Vol.14 (20), p.6551
Main Authors: Park, Jung, Lee, Gi, Jeong, Cheol, Kim, Ho, Kim, Choong
Format: Article
Language:English
Subjects:
Alternative energy sources
biochar
Biomass
Calorific value
Carbon
Carbonization
Charcoal
Coffee
Decarboxylation
Dehydration
energy density
Environmental impact
Fuel production
hydrothermal carbonization
Lignocellulose
Moisture content
Particle size
Particle size distribution
proximate analysis
reaction temperature
Selectivity
Size distribution
Solid suspensions
spent coffee grounds
Suction
Suspended solids
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Summary:This study was a preliminary investigation of solid recovered fuel production from spent coffee grounds using the hydrothermal carbonization (HTC) technique. The spent coffee grounds (SCGs) were subjected to HTC at 170 to 250 °C. The biochar was characterized by proximate analysis, ultimate analysis, capillary suction time, time to filter, suspended solids, and particle size distribution. The biochar yields decreased with increasing HTC temperature and time. However, the higher heating value (HHV) of biochar increased with the HTC temperature and time. The H/C slop relative to the O/C atomic rate of spent coffee grounds was 0.10 with low decarboxylation selectivity. Considering the HHV of biochar and dehydration capacity depend on ratio of H/C vs. O/C, the optimum reaction temperature of HTC was 200 °C, and the biochar from SCGs is an attractive biochar.
ISSN:1996-1073
1996-1073
DOI:10.3390/en14206551