Journal
RENEWABLE ENERGY
Volume 143, Issue -, Pages 1755-1765Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.renene.2019.05.122
Keywords
Hydrogen; Methane; Food waste; Activated sludge; Co-digestion; Two-stage process
Funding
- MIUR-Regione Toscana [DGRT 1208/2012]
- MIUR-MISE-Regione Toscana [DGRT 758/2013 PAR FAS 2007-2013]
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In this study, the co-digestion of food waste and activated sludge was evaluated in a two-stage anaerobic system and compared to the traditional single-stage process. The two-stage system was composed by two reactors connected in series able to perform the fermentative and the methanogenic phases separated. Experiments were carried out in semi-continuous mode under mesophilic conditions (37 degrees C). The two-stage technology achieved an overall improvement of the anaerobic performances. Results highlighted an increase in biogas production and volatile solids degradation of 26% and 9%, respectively. Considering the whole two-stage system, i.e. the sum of the biogas productions of the first and the second digester, these percentages increased up to 35.0%. Concerning gas quality, the two-stage system achieved a hydrogen rich biogas in the first fermentative reactor and an improvement of methane content in the second methanogenic digester. The average methane content shifted from 61.2% to 70.1%. The highest methane production of the two-stage process was due to improved substrate hydrolysis, with increased amounts of volatile fatty acids made readily available in the second stage. (C) 2019 Elsevier Ltd. All rights reserved.
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