 Bio-hydrogen and bio-methane production from food waste in a two-stage anaerobic digestion process with digestate recirculationDalal E. Algapani, Wei Qiao, Marina Ricci, Davide Bianchi, Simon M. Wandera, Fabrizio Adani and Renjie Dong Renewable Energy, 2019, vol. 130, issue C, 1108-1115 Abstract: Bio-H2 and bio-CH4 production from food waste in a two-stage temperature phased system were investigated to determine the effects of digestate recirculation on energy efficiency and process stability. Different recirculation ratios (RR), i.e. 0.3, 0.5, and 1.0, were tested. Maximum H2 production of 3 L-H2 L−1d−1 and yield of 135 L-H2 kg−1VSin were achieved for an RR of 0.3 at HRT 5 d and OLR of 18 kg-VS m−³d−1. The RR of 0.3 was also the best for producing CH4 and gave results of 2.9 L-CH4 L−1 d−1, i.e. 510 L-CH4 kg−1VSin at HRT 9 d and OLR of 5.7 kg-VS m−³ d−1. The energy recovered from the recirculation process increased the H2 production by 8% and decreased the CH4 production by 3%; the total energy production did not change. Digestate recirculation in comparison with a no-recirculation system reduced the need for alkali addition to maintain pH in the H2-reactor by 54%. Keywords: Anaerobic digestion; Bio-hydrogen and bio-methane; Digestate recirculation; Food waste; Two stage (search for similar items in EconPapers) Downloads: (external link) Related works: Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:130:y:2019:i:c:p:1108-1115 DOI: 10.1016/j.renene.2018.08.079 Access Statistics for this article Renewable Energy is currently edited by Soteris A. Kalogirou and Paul Christodoulides More articles in Renewable Energy from Elsevier |
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