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

Jung Eun Park, Gi Bbum Lee, Cheol Jin Jeong, Ho Kim and Choong Gon Kim
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Jung Eun Park: Center for Bio Resource, Institute for Advanced Engineering, Yongin-si 17180, Korea
Gi Bbum Lee: Center for Bio Resource, Institute for Advanced Engineering, Yongin-si 17180, Korea
Cheol Jin Jeong: Center for Bio Resource, Institute for Advanced Engineering, Yongin-si 17180, Korea
Ho Kim: Center for Bio Resource, Institute for Advanced Engineering, Yongin-si 17180, Korea
Choong Gon Kim: Center for Bio Resource, Institute for Advanced Engineering, Yongin-si 17180, Korea

Energies, 2021, vol. 14, issue 20, 1-11

Abstract: 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.

Keywords: biochar; energy density; hydrothermal carbonization; proximate analysis; reaction temperature; spent coffee grounds (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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