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Research article - Peer-reviewed, 2022

Microbial community development during syngas methanation in a trickle bed reactor with various nutrient sources

Cheng, George; Gabler, Florian; Pizzul, Leticia; Olsson, Henrik; Nordberg, Ake; Schnurer, Anna

Abstract

Microbial community development within an anaerobic trickle bed reactor (TBR) during methanation of syngas (56% H-2, 30% CO, 14% CO2) was investigated using three different nutrient media: defined nutrient medium (241 days), diluted digestate from a thermophilic co-digestion plant operating with food waste (200 days) and reject water from dewatered digested sewage sludge at a wastewater treatment plant (220 days). Different TBR operating periods showed slightly different performance that was not clearly linked to the nutrient medium, as all proved suitable for the methanation process. During operation, maximum syngas load was 5.33 L per L packed bed volume (pbv) & day and methane (CH4) production was 1.26 L CH4/L-pbv/d. Microbial community analysis with Illumina Miseq targeting 16S rDNA revealed high relative abundance (20-40%) of several potential syngas and acetate consumers within the genera Sporomusa, Spirochaetaceae, Rikenellaceae and Acetobacterium during the process. These were the dominant taxa except in a period with high flow rate of digestate from the food waste plant. The dominant methanogen in all periods was a member of the genus Methanobacterium, while Methanosarcina was also observed in the carrier community. As in reactor effluent, the dominant bacterial genus in the carrier was Sporomusa. These results show that syngas methanation in TBR can proceed well with different nutrient sources, including undefined medium of different origins. Moreover, the dominant syngas community remained the same over time even when non-sterilised digestates were used as nutrient medium.

Keywords

Methanation; Syngas; Microbial community; Sporomusa; Methanobacterium; Trickling bed reactor

Published in

Applied Microbiology and Biotechnology
2022, volume: 106, pages: 5317-5333
Publisher: SPRINGER

Authors' information

Swedish University of Agricultural Sciences, Department of Molecular Sciences
Swedish University of Agricultural Sciences, Department of Energy and Technology
Gabler, Florian
RISE Research Institutes of Sweden
Pizzul, Leticia
RISE Research Institutes of Sweden
Olsson, Henrik
RISE Research Institutes of Sweden
Nordberg, Ake (Nordberg, Åke)
RISE Research Institutes of Sweden
Swedish University of Agricultural Sciences, Department of Energy and Technology
Swedish University of Agricultural Sciences, Department of Molecular Sciences

Associated SLU-program

Food Waste

Sustainable Development Goals

SDG6 Clean water
SDG12 Ensure sustainable consumption and production patterns

UKÄ Subject classification

Microbiology

Publication Identifiers

DOI: https://doi.org/10.1007/s00253-022-12035-5

URI (permanent link to this page)

https://res.slu.se/id/publ/118429