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Methane-Driven Perchlorate Reduction by a Microbial Consortium.

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  • 1Australian Centre for Water and Environmental Biotechnology, The University of Queensland, St Lucia, Queensland 4072, Australia.

Environmental Science & Technology
|July 22, 2024
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Summary
This summary is machine-generated.

Microbial communities use methane to reduce perchlorate, a process crucial for understanding methane and chlorine cycles. Aerobic methanotrophs and perchlorate-reducing bacteria work together, with methanotrophs producing acetate to support the bacteria.

Keywords:
aerobic methanotrophsmembrane bioreactormethane oxidationoxygen-limitingperchlorate reductionperchlorate-reducing bacteria

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Area of Science:

  • Environmental Microbiology
  • Biogeochemistry
  • Microbial Ecology

Background:

  • Methane oxidation coupled with perchlorate reduction is observed but poorly understood.
  • The microbial mechanisms driving this process require elucidation.

Purpose of the Study:

  • To investigate the microbial mechanisms of methane-driven perchlorate reduction.
  • To identify key microbial players and their interactions in this process.

Main Methods:

  • Enrichment of microbial cultures in a membrane bioreactor (MBR) under oxygen-limiting conditions.
  • DNA-based stable isotope probing (SIP) incubation.
  • High-throughput sequencing of 16S rRNA and functional genes (pmoA, pcrA, narG).
  • Coculture experiments.

Main Results:

  • Perchlorate reduction was confirmed to be coupled with methane oxidation.
  • Acetate was identified as a potential intermediate, and oxygen is essential for methane activation.
  • Synergistic interactions between aerobic methanotrophs (Methylococcus, Methylocystis) and perchlorate-reducing bacteria (PRB; Denitratisoma, Dechloromonas) were revealed.
  • Coculture experiments demonstrated that methanotrophs support PRB activity by producing acetate.

Conclusions:

  • This study elucidates the microbial consortium mediating methane-driven perchlorate reduction.
  • Findings highlight the synergistic roles of methanotrophs and PRB in linking methane and chlorine biogeochemical cycles.
  • The results have implications for understanding similar microbial processes in natural environments.