Maximizing the biomethane yield from algal biomass by integrating hydrothermal posttreatment of the anaerobic solid digestate

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TypeArticle
Proceedings titleProceedings Venice2016, Sixth International Symposium on Energy from Biomass and Waste, 14-17 November 2016, Great School of St. John the Evangelist, Venice, Italy
ConferenceVenice2016, Sixth International Symposium on Energy from Biomass and Waste, 14-17 November 2016, Venice, Italy
Pages# of pages: 10
Subjectmicroalgae; degradation; wet oxidation; hydrothermal carbonization; biomethane; anaerobic digestion
AbstractAs an alternative to applying the hydrothermal treatment to the raw algal feedstock before the anaerobic digestion (i.e. pre-treatment), one considered a post- treatment scenario where anaerobic digestion is directly used as the primary treatment while the hydrothermal treatment is thereafter applied to the digestate. Hydrothermal treatments such as wet oxidation (WetOx) and hydrothermal carbonization (HTC) were compared at a temperature of 200°C, for initial pressure of 0.1 and 0.82 MPa, and no holding time after the process had reached the temperature setpoint. Both WetOx and HTC resulted in a substantial solids conversion (47% with HTC; 64-83% with WetOx) into soluble products, while some carbon loss was observed (20-33%). This generated high soluble products concentrations (from 6.2 to 10.9 g soluble chemical oxygen demand/L). Biomethane potential tests showed that these hydrothermal treatments allowed for a 4-fold improvement of the digestate anaerobic biodegradability, with a methane potential of about 200 LSTP CH4/kg volatile solids when based on the organic content of the untreated digestate.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada; Energy, Mining and Environment
Peer reviewedYes
NRC numberNRC-EME-55778
NPARC number23002058
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Record identifiereec725a4-7834-4f91-9c87-5f2dbf533654
Record created2017-08-01
Record modified2017-08-01
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