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

Author(s)

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

Affiliation

^[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

• Document type: Journal article
• Source: INTERNATIONAL JOURNAL OF HYDROGEN ENERGY; v. 45, n. 19, p. 11011-11023, APR 3 2020.
• Web of Science Citations: 0

Abstract

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)

• FAPESP's process: 13/15665-8 - Structure and functional dynamics of microbial community of anaerobic digesters applied to energy recovery and environmental framework of wastes generated in bioethanol production of 1st and 2nd generation
• Grantee: Antônio Djalma Nunes Ferraz Júnior
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 15/21650-9 - Applied metagenomics for biofuels development and environmental sustainability in biorefineries based on sugarcane
• Grantee: Antônio Djalma Nunes Ferraz Júnior
• Support Opportunities: Scholarships abroad - Research Internship - Post-doctor