Biogas sequestration from the headspace of a fermentative system enhances hydrogen production rate and yield

Autor(es)

Nunes Ferraz Junior, Antonio Djalma ^[1] ; Pages, Clemence ^[1] ; Latrille, Eric ^[1] ; Bernet, Nicolas ^[1] ; Zaiat, Marcelo ^[2] ; Trably, Eric ^[1]

Afiliação do(s) autor(es)

^[1] Univ Montpellier, INRAE, LBE, Narbonne - France

^[2] Univ Sao Paulo, Ctr Res Dev & Innovat Environm Engn, Sao Carlos Sch Engn EESC, Biol Proc Lab, Engn Ambiental Bloco 4-F, Av Joao Dagnone 1100, BR-13563120 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: INTERNATIONAL JOURNAL OF HYDROGEN ENERGY; v. 45, n. 19, p. 11011-11023, APR 3 2020.
• Citações Web of Science: 0

Resumo

Total pressure (TP) affects the level of dissolved hydrogen gas in the fermentation medium leading to metabolic shifts in mixed microbial-culture-based systems. In this study, the effect on hydrogen production rate and yield was investigated at different TP of a hydrogen-producing system using a microbial non-sterile culture previously heat-treated. Four continuous stirred-tank reactors (CSTR) were operated in parallel on a mineral salts molasses medium (21 g-COD. L-1) at 35 degrees C, pH 5.5 and hydraulic retention time (HRT) of 6 h. The TP was set at 80 kPa (R1), 100 kPa (R2), 120 kPa (R3) and 140 kPa (R4) for which reactor performances were estimated at steady-state conditions. As the increase of TP conse quently increased the partial pressure of hydrogen (p(H2)), the hydrogen production rate (HPR) and yield (HY) were consistently negatively influenced. The highest HPR and HY (406.1 +/- 36.8 mL-H-2 h(-1) ; 4.51 molH(2) mol(-1)suc eq.) were achieved at low pressure conditions (80 kPa). The composition of the microbial community mainly represented by species from Sporolactobacillus and Clostridium genera, did not change with the increase and/or decrease of the TP, indicating a regulation at cellular but not population level. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 13/15665-8 - Estrutura e dinâmica funcional da comunidade microbiana de digestores anaeróbios, aplicados à recuperação de energia e adequação ambiental de resíduos gerados no processo produtivo do bioetanol de 1ª e 2ª geração
• Beneficiário: Antônio Djalma Nunes Ferraz Júnior
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 15/21650-9 - Metagenômica aplicada ao desenvolvimento de biocombustíveis e ao desenvolvimento sustentável das biorrefinarias baseadas na cana-de-açúcar
• Beneficiário: Antônio Djalma Nunes Ferraz Júnior
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado