Role of the Thickness of Medium on Solid-State Anaerobic Digestion - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Waste and Biomass Valorization Année : 2022

Role of the Thickness of Medium on Solid-State Anaerobic Digestion

Résumé

In solid-state anaerobic digestion, the production of methane is limited compared to liquid-state anaerobic digestion. One of the possible reasons of this limitation could be the reduction of the diffusion of the molecules due to the high total solid content, creating local inhibitory environment. This study investigates the effect of the thickness of the reaction environment and by extension the effect of the diffusion on solid-state anaerobic digestion to evaluate this hypothesis. Two kind of anaerobic reactors with different thicknesses of a wheat-straw based medium (1.0 and 4.2 cm) were investigated for 33 days. The results showed an inhibition of methanogenesis for 4.2 cm height, which generated a gradient of propionate all along the medium thickness. This gradient was likely due to a local accumulation of H-2, and a high partial pressure of hydrogen can result in an inhibition of the hydrolysis step. This result could explain why a high total solid content in solid-state anaerobic digestion results in an inhibition of the global anaerobic digestion, due to the local accumulation of inhibitory products. Therefore, mixing of solid-state anaerobic digester is mandatory to improve the methane production.
Fichier principal
Vignette du fichier
Cazier_Article_Gradient_vs.pdf (1.38 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-03578766 , version 1 (28-07-2023)

Identifiants

Citer

Elisabeth Cazier, Eric Trably, Jean-Philippe Steyer, Renaud Escudié. Role of the Thickness of Medium on Solid-State Anaerobic Digestion. Waste and Biomass Valorization, 2022, 13 (6), pp.2871-2880. ⟨10.1007/s12649-022-01698-w⟩. ⟨hal-03578766⟩
58 Consultations
20 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More