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Hydrothermal Carbonization Brewer’s Spent Grains with the Focus on Improving the Degradation of the Feedstock

Author

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  • Pablo J. Arauzo

    (Department of Conversion Technologies of Biobased Resources, Institute of Agricultural Engineering, University of Hohenheim, Garbenstrasse 9, 70599 Stuttgart, Germany)

  • Maciej P. Olszewski

    (Department of Conversion Technologies of Biobased Resources, Institute of Agricultural Engineering, University of Hohenheim, Garbenstrasse 9, 70599 Stuttgart, Germany)

  • Andrea Kruse

    (Department of Conversion Technologies of Biobased Resources, Institute of Agricultural Engineering, University of Hohenheim, Garbenstrasse 9, 70599 Stuttgart, Germany)

Abstract

Hydrochar is a very interesting product from agricultural and food production residues. Unfortunately, severe conditions for complete conversion of lignocellulosic biomass is necessary, especially compared to the conversion of sugar compounds. The goal of this work is to improve the conversion of internal carbohydrates by application of a two-steps process, by acid addition and slightly higher water content. A set of experiments at different temperatures (180, 200, and 220 °C), reaction times (2 and 4 h), and moisture contents (80% and 90%) was performed to characterize the solid (high heating value ( HHV ), elemental) and liquid product phase. Afterwards, acid addition for a catalyzed hydrolysis reaction during hydrothermal carbonization (HTC) and a two-steps reaction (180 and 220 °C) were tested. As expected, a higher temperature leads to higher C content of the hydrochar and a higher fixed carbon (FC) content. The same effect was found with the addition of acids at lower temperatures. In the two-steps reaction, a primary hydrolysis step increases the conversion of internal carbohydrates. Higher water content has no significant effect, except for increasing the solubility of ash components.

Suggested Citation

  • Pablo J. Arauzo & Maciej P. Olszewski & Andrea Kruse, 2018. "Hydrothermal Carbonization Brewer’s Spent Grains with the Focus on Improving the Degradation of the Feedstock," Energies, MDPI, vol. 11(11), pages 1-15, November.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:11:p:3226-:d:184403
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    References listed on IDEAS

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    4. Mateusz Jackowski & Łukasz Niedźwiecki & Krzysztof Mościcki & Amit Arora & Muhammad Azam Saeed & Krystian Krochmalny & Jakub Pawliczek & Anna Trusek & Magdalena Lech & Jan Skřínský & Jakub Čespiva & J, 2021. "Synergetic Co-Production of Beer Colouring Agent and Solid Fuel from Brewers’ Spent Grain in the Circular Economy Perspective," Sustainability, MDPI, vol. 13(18), pages 1-17, September.
    5. Tiago Teribele & Maria Elizabeth Gemaque Costa & Conceição de Maria Sales da Silva & Lia Martins Pereira & Lucas Pinto Bernar & Douglas Alberto Rocha de Castro & Fernanda Paula da Costa Assunção & Mar, 2023. "Hydrothermal Carbonization of Corn Stover: Structural Evolution of Hydro-Char and Degradation Kinetics," Energies, MDPI, vol. 16(7), pages 1-22, April.
    6. Mateusz Jackowski & Lukasz Niedzwiecki & Magdalena Lech & Mateusz Wnukowski & Amit Arora & Monika Tkaczuk-Serafin & Marcin Baranowski & Krystian Krochmalny & Vivek K. Veetil & Przemysław Seruga & Anna, 2020. "HTC of Wet Residues of the Brewing Process: Comprehensive Characterization of Produced Beer, Spent Grain and Valorized Residues," Energies, MDPI, vol. 13(8), pages 1-20, April.
    7. Pablo J. Arauzo & María Atienza-Martínez & Javier Ábrego & Maciej P. Olszewski & Zebin Cao & Andrea Kruse, 2020. "Combustion Characteristics of Hydrochar and Pyrochar Derived from Digested Sewage Sludge," Energies, MDPI, vol. 13(16), pages 1-15, August.
    8. Manfredi Picciotto Maniscalco & Maurizio Volpe & Antonio Messineo, 2020. "Hydrothermal Carbonization as a Valuable Tool for Energy and Environmental Applications: A Review," Energies, MDPI, vol. 13(16), pages 1-26, August.
    9. Antonio Picone & Maurizio Volpe & Antonio Messineo, 2021. "Process Water Recirculation during Hydrothermal Carbonization of Waste Biomass: Current Knowledge and Challenges," Energies, MDPI, vol. 14(10), pages 1-14, May.
    10. Arauzo, P.J. & Olszewski, M.P. & Wang, X. & Pfersich, J. & Sebastian, V. & Manyà, J. & Hedin, N. & Kruse, A., 2020. "Assessment of the effects of process water recirculation on the surface chemistry and morphology of hydrochar," Renewable Energy, Elsevier, vol. 155(C), pages 1173-1180.
    11. Michela Lucian & Maurizio Volpe & Luca Fiori, 2019. "Hydrothermal Carbonization Kinetics of Lignocellulosic Agro-Wastes: Experimental Data and Modeling," Energies, MDPI, vol. 12(3), pages 1-20, February.

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