Abstract
Methane is produced in anaerobic environments, such as reactors used to treat wastewaters, and can be consumed by methanotrophs. The composition and structure of a microbial community enriched from anaerobic sewage sludge under methane-oxidation condition coupled to denitrification were investigated. Denaturing gradient gel electrophoresis (DGGE) analysis retrieved sequences of Methylocaldum and Chloroflexi. Deep sequencing analysis revealed a complex community that changed over time and was affected by methane concentration. Methylocaldum (8.2%), Methylosinus (2.3%), Methylomonas (0.02%), Methylacidiphilales (0.45%), Nitrospirales (0.18%), and Methanosarcinales (0.3%) were detected. Despite denitrifying conditions provided, Nitrospirales and Methanosarcinales, known to perform anaerobic methane oxidation coupled to denitrification (DAMO) process, were in very low abundance. Results demonstrated that aerobic and anaerobic methanotrophs coexisted in the reactor together with heterotrophic microorganisms, suggesting that a diverse microbial community was important to sustain methanotrophic activity. The methanogenic sludge was a good inoculum to enrich methanotrophs, and cultivation conditions play a selective role in determining community composition.
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Abbreviations
- ANME:
-
Anaerobic methanotrophic archaea
- DAMO:
-
Denitrifying anaerobic methane oxidation
- DGGE:
-
Denaturing gradient gel electrophoresis
- OTU:
-
Operational taxonomic unit
- UASB:
-
Upflow anaerobic sludge blanket reactor
- VTS:
-
Volatile total solids
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Acknowledgments
We wish to thank the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES), Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), and Fundação de Amparo a Pesquisa do Estado de Minas Gerais (FAPEMIG). We are also grateful to Dr. Emanuel F. Brandt for helping with the methane mass balance calculation.
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Siniscalchi, L.A.B., Leite, L.R., Oliveira, G. et al. Illumina sequencing-based analysis of a microbial community enriched under anaerobic methane oxidation condition coupled to denitrification revealed coexistence of aerobic and anaerobic methanotrophs. Environ Sci Pollut Res 24, 16751–16764 (2017). https://doi.org/10.1007/s11356-017-9197-9
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DOI: https://doi.org/10.1007/s11356-017-9197-9