期刊
ENERGIES
卷 12, 期 9, 页码 -出版社
MDPI
DOI: 10.3390/en12091586
关键词
hydrothermal carbonisation (HTC); anaerobic digestion (AD); waste management; biorefinery; digestate; pyrolysis; hydrochar; slagging and fouling; biogas (BMP); biodegradability
资金
- EPSRC Centre for Doctoral Training in Bioenergy at the University of Leeds [EP/L014912/1]
- University of Leeds
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 degrees 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 degrees 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.
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