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oai:docta.ucm.es:20.500.14352/724962023-07-12T23:50:25Zcom_20.500.14352_14col_20.500.14352_15
Docta Complutense author Noguer, Marie Céline author Magdalena Cadelo, José Antonio author Bernet, Nicolas author Escudié, Renaud author Trably, Eric 2023-06-22T12:26:57Z 2023-06-22T12:26:57Z 2022-05-21 1996-1073 10.3390/en15114048 https://hdl.handle.net/20.500.14352/72496 https://doi.org/10.3390/en15114048 https://www.mdpi.com/1996-1073/15/11/4048 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 LH2·L·d−1, which was 48% higher than in the control reactor (1.5 ± 0.2 LH2·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. eng Atribución 3.0 España Enhanced Fermentative Hydrogen Production from Food Waste in Continuous Reactor after Butyric Acid Treatment journal article URL https://docta.ucm.es/bitstreams/93d6468c-dac8-43d3-8da7-15d5b03ae545/download File MD5 4fa2d4bbee05cd01431b27b47047013b 2131794 application/pdf energies-15-04048-v3.pdf URL https://docta.ucm.es/bitstreams/c97dbc9c-e04d-468a-a5a5-a53aebda5ac0/download File MD5 3f712ac5251fcd66c1fff909fa6d472e 73123 text/plain energies-15-04048-v3.pdf.txt