1. Kinetic study of dry anaerobic co-digestion of food waste and cardboard for methane production
- Author
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Jean-Philippe Delgenès, Nicolas Bernet, Maxime Rouez, Eric Trably, Jean-Philippe Steyer, Marion Crest, Renaud Escudié, Gabriel Capson-Tojo, Laboratoire de Biotechnologie de l'Environnement [Narbonne] (LBE), Institut National de la Recherche Agronomique (INRA)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), 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), Centre International de Recherche Sur l'Eau et l'Environnement [Suez] (CIRSEE), and SUEZ ENVIRONNEMENT (FRANCE)
- Subjects
Paper ,020209 energy ,[SDV]Life Sciences [q-bio] ,02 engineering and technology ,010501 environmental sciences ,Solid Waste ,7. Clean energy ,01 natural sciences ,biomethane ,urban solid waste ,Methane ,12. Responsible consumption ,chemistry.chemical_compound ,Ammonia ,Bioreactors ,Biogas ,11. Sustainability ,0202 electrical engineering, electronic engineering, information engineering ,Organic matter ,Anaerobiosis ,Waste Management and Disposal ,0105 earth and related environmental sciences ,2. Zero hunger ,chemistry.chemical_classification ,Waste management ,cardboard ,Fatty Acids, Volatile ,Pulp and paper industry ,Refuse Disposal ,Anaerobic digestion ,Food waste ,chemistry ,Food ,13. Climate action ,visual_art ,microbial adaptation ,solid-state AD ,[SDE]Environmental Sciences ,visual_art.visual_art_medium ,Digestion - Abstract
International audience; Dry anaerobic digestion is a promising option for food waste treatment and valorization. However, accumulation of ammonia and volatile fatty acids often occurs, leading to inefficient processes and digestion failure. Co-digestion with cardboard may be a solution to overcome this problem. The effect of the initial substrate to inoculum ratio (0.25 to 1 gVS·g VS−1) and the initial total solids contents (20–30%) on the kinetics and performance of dry food waste mono-digestion and co-digestion with cardboard was investigated in batch tests. All the conditions produced methane efficiently (71–93% of the biochemical methane potential). However, due to lack of methanogenic activity, volatile fatty acids accumulated at the beginning of the digestion and lag phases in the methane production were observed. At increasing substrate to inoculum ratios, the initial acid accumulation was more pronounced and lower cumulative methane yields were obtained. Higher amounts of soluble organic matter remained undegraded at higher substrate loads. Although causing slightly longer lag phases, high initial total solids contents did not jeopardize the methane yields. Cardboard addition reduced acid accumulation and the decline in the yields at increasing substrate loads. However, cardboard addition also caused higher concentrations of propionic acid, which appeared as the most last acid to be degraded. Nevertheless, dry co-digestion of food waste and cardboard in urban areas is demonstrated as an interesting feasible valorization option.
- Published
- 2017