Hydrothermal Carbonization of Digestate Produced in the Biogas Production Process

Joanna Mikusińska, Monika Kuźnia, Klaudia Czerwińska and Małgorzata Wilk ()
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Joanna Mikusińska: Department of Heat Engineering and Environment Protection, AGH University of Science and Technology, 30 Mickiewicza Av., 30-059 Krakow, Poland
Monika Kuźnia: Department of Heat Engineering and Environment Protection, AGH University of Science and Technology, 30 Mickiewicza Av., 30-059 Krakow, Poland
Klaudia Czerwińska: Department of Heat Engineering and Environment Protection, AGH University of Science and Technology, 30 Mickiewicza Av., 30-059 Krakow, Poland
Małgorzata Wilk: Department of Heat Engineering and Environment Protection, AGH University of Science and Technology, 30 Mickiewicza Av., 30-059 Krakow, Poland

Energies, 2023, vol. 16, issue 14, 1-18

Abstract: In agricultural biogas plants, besides biogas, the by-product digestate is also produced. Due to its high moisture content and organic origin, it can successfully be applied in the hydrothermal carbonization process to avoid the fate of landfilling. This paper reviews the properties of agricultural digestate and its hydrothermal conversion (HTC) into hydrochar and process water. The type of feedstock and the parameters of the HTC process, such as temperature, pressure and residence time, affects the physical and chemical characteristics of hydrochar. Therefore, its possible application might be as a biofuel, fertilizer, soil improver, adsorber, or catalyst. In this paper, the properties of hydrochar derived from agricultural digestate are widely discussed.

Keywords: biogas; digestate; hydrochar; hydrothermal carbonization; biofuel (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: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (5)

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