1. An Innovative Solid-State Micro-Anaerobic Digestion Process to Valorize Food Waste: Technical Development Constraints and Consequences on Biological Performances
- Author
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Anne Tremier, Patrick Dabert, Axelle Degueurce, Laurent Blondel, Pascal Peu, Megane Lebreton, S. Picard, Anne Le Bihan, Victor Argence, Martine Sarrazin, Optimisation des procédés en Agriculture, Agroalimentaire et Environnement (UR OPAALE), and Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)
- Subjects
Environmental Engineering ,Semi-continuous ,Methanogenic pathways ,Methanogenesis ,020209 energy ,Solid-state ,Two-stage ,02 engineering and technology ,7. Clean energy ,Methane ,12. Responsible consumption ,03 medical and health sciences ,chemistry.chemical_compound ,Waste production ,11. Sustainability ,0202 electrical engineering, electronic engineering, information engineering ,Leachate ,Waste Management and Disposal ,0303 health sciences ,Trace elements ,Waste management ,030306 microbiology ,Renewable Energy, Sustainability and the Environment ,[SDE.IE]Environmental Sciences/Environmental Engineering ,6. Clean water ,Anaerobic digestion ,Food waste ,chemistry ,Scientific method ,NGS ,Environmental science ,Leachate recirculation - Abstract
To face the increase of waste production and meet the energy demand of urban areas, municipal waste management systems should be rethought. Innovative solutions such as decentralised small-scale anaerobic digestion could be developed. This work presents the design, operation and performances of a new micro-scale anaerobic digester (AD) developed to degrade food waste (FW) in urban areas i.e. highly compact and with low water and energy demand. To meet these objectives, the new micro-scale AD is a semi-continuous and two-stage process built vertically to take advantage of the gravity to mix and move the digested matter instead of using mechanical devices. The first stage consists in a tubular reactor fed weekly with FW and periodically watered with leachate from the second stage reactor located below the tubular reactor. Results show that AD performances were highly correlated to the efficiency of hydric transfer between the tubular reactor and the leachate tank. Indeed, pH, volatile fatty acids and microbial community analysis showed that the hydrolysis occurred in the tubular reactor, while the methanogenesis step occurred in the leachate tank. Overall, the average methane production was 143 ± 87 NL/kgvs with an average methane content of 44 ± 10% and the operation mode of the process has still to be improved. Graphic Abstract
- Published
- 2022
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