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

Author

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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)

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.

Suggested Citation

  • Jung Eun Park & Gi Bbum Lee & Cheol Jin Jeong & Ho Kim & Choong Gon Kim, 2021. "Determination of Relationship between Higher Heating Value and Atomic Ratio of Hydrogen to Carbon in Spent Coffee Grounds by Hydrothermal Carbonization," Energies, MDPI, vol. 14(20), pages 1-11, October.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:20:p:6551-:d:654314
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    References listed on IDEAS

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