Modeling of sludge and flax anaerobic co-digestion based on combination of first order and modified Gompertz models: influence of C/N ratio and headspace gas volume - Nantes Université Accéder directement au contenu
Article Dans Une Revue Desalination and Water Treatment Année : 2022

Modeling of sludge and flax anaerobic co-digestion based on combination of first order and modified Gompertz models: influence of C/N ratio and headspace gas volume

Résumé

The goal of this study is to improve biogas yields from the co-digestion of primary sludge (PS) and flax, based on their carbon-to-nitrogen (C/N) ratio, and the effects of the headspace gas vol- ume fraction (HSVF) in the batch reactor. The work was carried out in two stages. First, five mix- tures of PS and flax at different C/N ratios were prepared for biogas production. The highest biogas production was observed at a C/N ratio of 20, and the lowest at a C/N ratio of 10. In the second stage, the optimum C/N ratio of 20 was used in batch reactor experiments to test five different HSVFs. The highest biogas productions were obtained at an HSVF of 2.33. However, the high- est methane content was recorded at an HSVF of 1.5 (62.33%). The theoretical and stoichiometric methane yields of the feedstock used were estimated. Biochemical Methane Potential (BMP) tests showed the presence of two fractions: one immediately biodegradable to methane and another, less biodegradable, which required a lag phase to transform into biogas. A new kinetic model repre- senting these two phases was proposed to accurately describe the results of the experiment.
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Dates et versions

hal-04222646 , version 1 (29-09-2023)

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Citer

Mahmoud Elsayed, Yves Andres, Walid Blel. Modeling of sludge and flax anaerobic co-digestion based on combination of first order and modified Gompertz models: influence of C/N ratio and headspace gas volume. Desalination and Water Treatment, 2022, 250, pp.136-147. ⟨10.5004/dwt.2022.28153⟩. ⟨hal-04222646⟩
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