Garden and food waste co-fermentation for biohydrogen and biomethane production in a two-step hyperthermophilic-mesophilic process

• Type: Article in International Scientific Journal
• Date: 2019

Authors

Abreu, AA (Author) Other; F. T. Pinho (Author) FEUP; Alves, MM (Author) Other; Cavaleiro, AJ (Author) Other; Pereira, MA (Author) Other

Journal

Title: Bioresource Technology

Vol. 278

Pages: 180-186

ISSN: 0960-8524

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 2 Citations

Other information

Authenticus ID: P-00Q-6V8

DOI: 10.1016/j.biortech.2019.01.085

Abstract (EN): 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 7