Biohydrogen and biomethane production from food waste using a two-stage dynamic membrane bioreactor (DMBR) system

[Display omitted] •DMBR enabled the high-rate H2 and CH4 production from the particulate feedstock.•Chemical energy in food waste was recovered up to 79% as the carbon-free energies.•DMBR retained active methanogenic microbiome at HRT 6 d.•CH4-DMBR was dominated by Clostridia, Methanobacterium and M...

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Published in:Bioresource technology 2022-05, Vol.352, p.127094-127094, Article 127094
Main Authors: Jung, Ju-Hyeong, Sim, Young-Bo, Ko, Jeun, Park, So Young, Kim, Gi-Beom, Kim, Sang-Hyoun
Format: Article
Language:English
Subjects:
Acetate capacity number
Biohydrogen
Biomethane
Clostridia
Dynamic membrane bioreactor
Food waste
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Summary:[Display omitted] •DMBR enabled the high-rate H2 and CH4 production from the particulate feedstock.•Chemical energy in food waste was recovered up to 79% as the carbon-free energies.•DMBR retained active methanogenic microbiome at HRT 6 d.•CH4-DMBR was dominated by Clostridia, Methanobacterium and Methanosaeta.•Clostridium was dominant in the microbial population of H2-DMBR. This study examined a two-stage dynamic membrane bioreactor (DMBR) system for biohydrogen and biomethane production from food waste (FW) in mesophilic condition. The two-stage DMBR system enabled high-rate H2 and CH4 production from particulate feedstock by enhanced microorganism retention. Chemical energy in FW was recovered up to 79% as renewable energy. The highest average hydrogen production rate of 7.09 ± 0.42 L/L-d was observed at a hydraulic retention time (HRT) of 8 h in the H2-DMBR, while the highest CH4 average production rate of 0.99 ± 0.02 L/L-d was observed at an HRT of 6 d in the CH4-DMBR. The high specific methanogenic activity of 71.7 mL CH4/g VSS-d was maintained at the short HRT, which also contributed to the high MPR. The genus Clostridium was dominant in the H2-DMBR, while bacterial and archaeal populations in the CH4-DMBR were dominated by the class Clostridia and genera Methanobacterium and Methanosaeta, respectively.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2022.127094