Journal
ATI 2018 - 73RD CONFERENCE OF THE ITALIAN THERMAL MACHINES ENGINEERING ASSOCIATION
Volume 148, Issue -, Pages 1018-1025Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.egypro.2018.08.059
Keywords
Anaerobic Digestion; Dark Fermentation; Food Waste; Bio-hydrogen; Bio-methane; ICE; Fuell Cells; Microturbine
Categories
Funding
- MIUR-Regione Toscana [DGRT 1208/2012]
- MIUR-MISE-Regione Toscana [DGRT 758/2013]
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Anaerobic digestion of biodegradable substrates is a proven biological based technology that recovers energy in the form of biogas for use in combined heat and power plants. In this respect, hydrogen production during the acidogenic phase can improve process efficiency. The purpose of this study is to evaluate energy recovery from the production of hydrogen and methane by using food waste as substrate. The primary energy saving obtained by different users of biogas was calculated considering the specific gas production evaluated through pilot tests carried out in semicontinuous mode. The physical separation of the traditional anaerobic digestion in two-phase anaerobic process was demonstrated to be beneficial for the methanogenic phase in terms of gas production increase but not efficient in terms of overall energy performance. Although specific methane production increased in semi-continuous mode respect to batch tests, H-2 production decreased and hydrogen concentration dropped from 45% to 22.9%. Therefore, biohydrogen production in semi-continuous conditions results to be not sufficient to balance out adding energy consumption due to heating of dark fermentation digester. (C) 2018 The Authors. Published by Elsevier Ltd.
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