Sequential dark fermentation and microbial electrolysis cells for hydrogen production: Volatile fatty acids influence and energy considerations
2023
Magdalena, Jose Antonio | Pérez-Bernal, María Fernanda | Bernet, Nicolas | Trably, Eric | Laboratoire de Biotechnologie de l'Environnement [Narbonne] (LBE) ; Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut Agro Montpellier ; Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro) | Universidad Complutense de Madrid = Complutense University of Madrid [Madrid] (UCM) | HyDS Project (part of the ERDF-REACT-EU- H2VERT project) | Ministry of Universities for the requalification of the Spanish University System for 2021–2023
International audience
显示更多 [+] 显示较少 [-]英语. Hydrogen production from food waste by coupling dark fermentation (DF) and microbial electrolysis cells (MEC) was studied. Metabolic patterns in DF, their effects on MECs efficiency, and the energy output of the coupling were investigated. Mesophilic temperature and acidic pH 5.5 resulted in 72 +/- 20 mL H2/g CODin and a butyrateenriched profile (C2/C4, 0.5-0.6) contrasting with an acetate-enriched profile (C2/C4, 1.8-1.9) and 36 +/- 10 mL H2/g CODin at pH 7. Assessment in series of the DF effluents in MECs resulted in a higher hydrogen yield (566-733 mL H2/g CODin) and volatile fatty acids (VFAs) removal (84-95%) obtained from pH 7 effluents compared to pH 5.5 effluents (173-186 mL H2/g CODin and 29-59%). Finally, the output energy was lower in DF at pH 7, however, these effluents retrieved the highest energy in the MEC, showing the importance of process pH and VFAs profile to balance the coupling.
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