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Integration of Hydrothermal Carbonisation with Anaerobic Digestion; Opportunities for Valorisation of Digestate

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  • Kiran R. Parmar

    (Centre for Integrated Energy Research, School of Chemical and Process Engineering, University of Leeds, Leeds LS2 9JT, UK)

  • Andrew B. Ross

    (Centre for Integrated Energy Research, School of Chemical and Process Engineering, University of Leeds, Leeds LS2 9JT, UK)

Abstract

Hydrothermal carbonisation (HTC) has been identified as a potential route for digestate enhancement producing a solid hydrochar and a process water rich in organic carbon. This study compares the treatment of four dissimilar digestates from anaerobic digestion (AD) of agricultural residue (AGR); sewage sludge (SS); residual municipal solid waste (MSW), and vegetable, garden, and fruit waste (VGF). HTC experiments were performed at 150, 200 and 250 °C for 1 h using 10%, 20%, and 30% solid loadings of a fixed water mass. The effect of temperature and solid loading to the properties of biocoal and biochemical methane potential (BMP) of process waters are investigated. Results show that the behaviour of digestate during HTC is feedstock dependent and the hydrochar produced is a poor-quality solid fuel. The AGR digestate produced the greatest higher heating value (HHV) of 24 MJ/kg, however its biocoal properties are poor due to slagging and fouling propensities. The SS digestate process water produced the highest amount of biogas at 200 °C and 30% solid loading. This study concludes that solely treating digestate via HTC enhances biogas production and that hydrochar be investigated for its use as a soil amender.

Suggested Citation

  • Kiran R. Parmar & Andrew B. Ross, 2019. "Integration of Hydrothermal Carbonisation with Anaerobic Digestion; Opportunities for Valorisation of Digestate," Energies, MDPI, vol. 12(9), pages 1-17, April.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:9:p:1586-:d:226042
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    References listed on IDEAS

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