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Journal Articles Bioengineered Year : 2023

Optimization of energy recovery efficiency from sweet sorghum stems by ethanol and methane fermentation processes coupling

Bakari Hamadou
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  • PersonId : 1278371
Djomdi Djomdi
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Ruben Zieba Falama
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Roger Djouldé Darnan
  • Function : Author
Fabrice Audonnet
Pierre Fontanille
Guillaume Pierre
Pascal Dubessay
Philippe Michaud
Gwendoline Christophe

Abstract

Taken separately, a single sweet sorghum stem bioconversion process for bioethanol and biomethane production only leads to a partial conversion of organic matter. The direct fermentation of crushed whole stem coupled with the methanization of the subsequent solid residues in a two-stage process was experimented to improve energy bioconversion yield, efficiency, and profitability. The raw stalk calorific value was 17,144.17 kJ/kg DM. Fermentation step performed using Saccharomyces cerevisiae resulted in a bioconversion yield of 261.18 g Eth/kg DM, i.e. an energy recovery efficiency of 6921.27 kJ/kg DM. The methanogenic potentials were 279 and 256 LCH4/kg DM, respectively, for raw stem and fermentation residues, i.e. energy yields of 10,013.31 and 9187.84 kJ/kg DM, respectively. Coupling processes have significantly increased yield and made it possible to reach 13,309.57 kJ/kg DM, i.e. 77.63% of raw stem energy recovery yield, compared to 40.37% and 58.40%, respectively, for single fermentation and methanization processes.
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Dates and versions

hal-04189853 , version 1 (09-07-2024)

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Bakari Hamadou, Djomdi Djomdi, Ruben Zieba Falama, Roger Djouldé Darnan, Fabrice Audonnet, et al.. Optimization of energy recovery efficiency from sweet sorghum stems by ethanol and methane fermentation processes coupling. Bioengineered, 2023, 14 (1), pp.228-244. ⟨10.1080/21655979.2023.2234135⟩. ⟨hal-04189853⟩
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