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Improving anaerobic digestion mass balance calculations through stoichiometry and usual substrate characterization

Abstract : In recent years, anaerobic digestion (AD) of organic waste has raised as a winning strategy to produce energy and organic fertilizer. To optimize such a technology, mass balance is needed to model or simply monitor the process. This paper describes a theoretical framework allowing process indicators to be derived from estimates of organic waste elemental composition. Using a database of 128 typical feedstocks, semi-empirical equations are provided to estimate this elemental composition in case of a missing analysis. Then, a revised stoichiometric reaction of anaerobic digestion is proposed considering biomass yield and nitrogen. Biomass yield induces a more accurate estimation of the ammonia production and the volatile solids (VS) loss. The stoichiometric reaction allows the prediction of biogaz quality and mass loss and a correction factor for VS removal is proposed. The use of real case studies highlights the need to consider this correction (correction factor range: 1.01–1.2), especially for dry AD.
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https://hal.inrae.fr/hal-03319269
Contributor : Dominique Fournier <>
Submitted on : Thursday, August 12, 2021 - 8:05:37 AM
Last modification on : Tuesday, August 17, 2021 - 3:28:32 AM

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Roman Moscoviz, Julie Jimenez. Improving anaerobic digestion mass balance calculations through stoichiometry and usual substrate characterization. Bioresource Technology, Elsevier, 2021, 337, pp.125402. ⟨10.1016/j.biortech.2021.125402⟩. ⟨hal-03319269⟩

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