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Microbial diversity and dynamics during methane production from municipal solid waste.

Christopher A Bareither1, Georgia L Wolfe, Katherine D McMahon

  • 1Civil & Environmental Engineering, Colorado State University, Ft. Collins, CO 80532, USA; Geological Engineering, University of Wisconsin-Madison, Madison, WI 53706, USA.

Waste Management (New York, N.Y.)
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Summary

Microbial communities in bioreactors drive methane generation from municipal solid waste (MSW). Specific methanogens, influenced by waste composition, correlate with methane yield, optimizing waste biodegradation.

Keywords:
Bioreactor landfillMethaneMethanogenMunicipal solid wasteQuantitative PCR

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Area of Science:

  • Environmental Microbiology
  • Bioreactor Technology
  • Waste Management

Background:

  • Municipal solid waste (MSW) biodegradation is a key process in landfills.
  • Understanding microbial dynamics is crucial for optimizing methane generation.

Purpose of the Study:

  • Characterize bacterial and archaeal populations during MSW biodegradation.
  • Link specific methanogens to methane production.
  • Investigate the impact of waste composition on microbial communities and methane yield.

Main Methods:

  • Laboratory-scale bioreactor simulation of MSW landfills.
  • Pyrosequencing of 16S rRNA genes for microbial community analysis.
  • Quantitative polymerase chain reaction (qPCR) for specific methanogen quantification.

Main Results:

  • Leachate microbial assemblages were similar during peak methane generation.
  • Bacteroidetes and Thermotogae phyla were abundant during peak methane generation.
  • Methanomicrobiales, Methanosarcinaceae, and Methanobacteriales were predominant methanogens.
  • Higher initial cellulose and hemicellulose content correlated with increased methanogen abundance and methane yield.

Conclusions:

  • Microbial community structure and methanogen abundance directly influence methane generation from MSW.
  • Initial waste composition (cellulose and hemicellulose) is a critical factor affecting methanogen populations and overall methane yield.
  • This study provides insights into microbial ecology for enhanced biogas production from solid waste.