Selection of metabolic pathways for continuous hydrogen production under thermophilic and mesophilic temperature conditions in anaerobic fluidized bed reactors

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논문

Selection of metabolic pathways for continuous hydrogen production under thermophilic and mesophilic temperature conditions in anaerobic fluidized bed reactors

학술지

International journal of hydrogen energy

저자명

Ferreira, Tiago Borges; Rego, Gabriel Catucci; Ramos, Lucas Rodrigues; Soares, Laí s Amé rico; Sakamoto, Isabel Kimiko; de Oliveira, Lorena Lima; Varesche, Maria Bernadete Amâ ncio; Silva, Edson Luiz

초록

Abstract This study evaluated the influence of hydraulic retention time (HRT) on hydrogen (H2) production in anaerobic fluidized bed reactors at mesophilic (30 °C, AFBR-M) and thermophilic (55 °C, AFBR-T) temperatures. Reactors were fed sucrose-based synthetic wastewater (5000 mg chemical oxygen demand·L−1) in the HRT of 8, 6, 4, 2, or 1 h. H2 production rate increased from 67.8 ± 14.8 to 194.9 ± 57.0 ml H2·h−1 L−1 (AFBR-T) and from 72.0 ± 10.0 to 344.4 ± 74.0 mL H2·h−1·l−1 (AFBR-M) when HRT decreased from 8 to 1 h. Maximum H2 yields for AFBR-T and AFBR-M were 1.93 ± 0.21 and 2.68 ± 0.48 mol H2·mol−1 sucrose, respectively. The main metabolites were acetic acid (31.3%–41.5%) and butyric acid (10.2%–20.7%) (AFBR-M) and acetate (20.1%–39.3%) and ethanol (14.3%–29.9%) (AFBR-T). Denaturing gradient gel electrophoresis profiles revealed selective enrichment of microbial populations responsible for H2 production by the aceto-butyric route (AFBR-M) and ethanol-type fermentation (AFBR-T). Highlights <UL> <LI> Effects of hydraulic retention time and temperature on H2 production were examined. </LI> <LI> Maximum H2 production rate was 344.4 ± 74.0 mL H2·h−1·L−1. </LI> <LI> Maximum H2 yield was 2.68 ± 0.48 mol H2·mol−1 sucrose. </LI> <LI> H2 was produced by aceto-butyric route and thermophilic ethanol-type fermentation. </LI> <LI> Mesophilic H2 production from sucrose was more efficient than thermophilic. </LI> </UL> Graphical abstract [DISPLAY OMISSION]

발행연도

2018

발행기관

Elsevier

ISSN

0360-3199

ISSN

1879-3487

권

호

페이지

pp.18908-18917