Garden and food waste co-fermentation for biohydrogen and biomethane production in a two-step hyperthermophilic-mesophilic process. (April 2019)

• Record Type: Journal Article
• Authors: Abreu, A.A.; Tavares, F.; Alves, M.M.; Cavaleiro, A.J.; Pereira, M.A.
• Is Part Of: Bioresource technology. Volume 278(2019)
• Page Start: 180
• Page End: 186
• Publication Date: 2019-04
• Subjects: Garden waste -- Food waste -- Co-fermentation -- Caldicellulosiruptor saccharolyticus -- Biochemical methane potential; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2019.01.085
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: Hydrogen and methane were produced from garden waste (GW) and food waste (FW). Maximum H2 yield resulted from GW:FW 90:10% co-fermentation by C. saccharolyticus . Methane was produced from the end products of GW:FW 90:10% co-fermentation. A potential total energy generation of 24.9 MJ kg −1 may be achieved. Abstract: Co-fermentation of garden waste (GW) and food waste (FW) was assessed in a two-stage process coupling hyperthermophilic dark-fermentation and mesophilic anaerobic digestion (AD). In the first stage, biohydrogen production from individual substrates was tested at different volatile solids (VS) concentrations, using a pure culture of Caldicellulosiruptor saccharolyticus as inoculum. FW concentrations (in VS) above 2.9 g L −1 caused a lag phase of 5 days on biohydrogen production. No lag phase was observed for GW concentrations up to 25.6 g L −1 . In the co-fermentation experiments, the highest hydrogen yield (46 ± 1 L kg −1 ) was achieved for GW:FW 90:10% (w/w). In the second stage, a biomethane yield of 682 ± 14 L kg −1 was obtained using the end-products of GW:FW 90:10% co-fermentation. The energy generation predictable from co-fermentation and AD of GW:FW 90:10% is 0.5 MJ kg −1 and 24.4 MJ kg −1, respectively, which represents an interesting alternative for valorisation of wastes produced locally in communities.