Enhanced Fermentative Hydrogen Production from Food Waste in Continuous Reactor after Butyric Acid Treatment

Marie Céline Noguer, Jose Antonio Magdalena, Nicolas Bernet, Renaud Escudié and Eric Trably
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Marie Céline Noguer: INRAE, University of Montpellier, LBE, 102 Avenue des Etangs, 11100 Narbonne, France
Jose Antonio Magdalena: INRAE, University of Montpellier, LBE, 102 Avenue des Etangs, 11100 Narbonne, France
Nicolas Bernet: INRAE, University of Montpellier, LBE, 102 Avenue des Etangs, 11100 Narbonne, France
Renaud Escudié: INRAE, University of Montpellier, LBE, 102 Avenue des Etangs, 11100 Narbonne, France
Eric Trably: INRAE, University of Montpellier, LBE, 102 Avenue des Etangs, 11100 Narbonne, France

Energies, 2022, vol. 15, issue 11, 1-18

Abstract: End-product accumulation during dark fermentation leads to process instability and hydrogen production inhibition. To overcome this constraint, microbial community adaptation to butyric acid can induce acid tolerance and thus enhance the hydrogen yields; however, adaptation and selection of appropriate microbial communities remains uncertain when dealing with complex substrates in a continuous fermentation mode. To address this question, a reactor fed in continuous mode with food waste (organic loading rate of 60 gVS·L·d −1 ; 12 h hydraulic retention time) was first stressed for 48 h with increasing concentrations of butyric acid (up to 8.7 g·L −1 ). Performances were compared with a control reactor (unstressed) for 13 days. During 6 days in a steady-state, the pre-stressed reactor produced 2.2 ± 0.2 LH 2 ·L·d −1 , which was 48% higher than in the control reactor (1.5 ± 0.2 LH 2 ·L·d −1 ). The pretreatment also affected the metabolites’ distribution. The pre-stressed reactor presented a higher production of butyric acid (+44%) achieving up to 3.8 ± 0.3 g·L −1 , a lower production of lactic acid (−56%), and an enhancement of substrate conversion (+9%). The performance improvement was attributed to the promotion of Clostridium guangxiense , a hydrogen -producer, with a relative abundance increasing from 22% in the unstressed reactor to 52% in the stressed reactor.

Keywords: biohydrogen; butyric acid; dark fermentation; inhibition; microbial communities; start-up (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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