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Area of Science:

  • * Microbial Ecology
  • * Biogeochemistry
  • * Environmental Microbiology

Background:

  • * Trace elements are crucial cofactors for enzymes involved in microbial metabolism, including organic matter degradation and methanogenesis.
  • * Limited research exists on the impact of trace elements on microbial communities driving biogenic coalbed methane (CBM) production.
  • * Subsurface microbial life in coal beds may be limited by the availability of essential trace elements.

Purpose of the Study:

  • * To investigate the effects of specific trace element amendments on the structure and function of active microbial communities in coalbed methane environments.
  • * To determine if trace element supplementation can stimulate methane production in subsurface coalbeds.
  • * To understand how trace elements influence the composition and metabolic activity of bacterial and methanogenic communities.

Main Methods:

  • * Microcosm experiments using produced water and coal from Powder River Basin CBM wells.
  • * Pilot testing of eight different trace elements, focusing on Co, Cu, and Mo.
  • * Analysis of methane production rates, mcrA gene transcript levels, and microbial community composition via 16S rRNA and mcrA cDNA sequencing.

Main Results:

  • * Individual amendments of cobalt (Co), copper (Cu), and molybdenum (Mo) significantly increased methane production.
  • * Higher mcrA transcript levels, a key marker for methanogenesis, correlated positively with increased methane yields.
  • * Trace element additions led to shifts in the active methanogenic community structure, increasing diversity, particularly of hydrogenotrophic methanogens, and promoting the abundance of active Acetobacterium species.

Conclusions:

  • * Essential trace elements are vital for the metabolic activity of microbial communities involved in subsurface CBM production.
  • * Trace element amendments can modulate microbial community structure and function, leading to enhanced methane generation.
  • * This study provides insights into microbial nutrient limitations in coal beds and offers potential strategies for revitalizing depleted CBM wells.