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Related Experiment Videos

Nitrogen management in bioreactor landfills.

G Alexander Price1, Morton A Barlaz, Gary R Hater

  • 1Department of Civil, Construction and Environmental Engineering, North Carolina State University, Box 7908, Raleigh, NC 27695-7908, USA.

Waste Management (New York, N.Y.)
|September 6, 2003
PubMed
Summary

Landfills can convert nitrate to nitrogen gas, a harmless byproduct. This study demonstrates the technical viability of using landfills as bioreactors for effective nitrogen management.

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Area of Science:

  • Environmental Engineering
  • Microbial Ecology
  • Waste Management

Background:

  • Long-term nitrogen management in landfills is crucial.
  • Ex situ nitrification followed by in situ denitrification is a potential strategy.
  • Understanding denitrification in landfill environments is key.

Purpose of the Study:

  • To measure the denitrification potential of landfill refuse.
  • To assess nitrate consumption in actively decomposing and well-decomposed refuse.
  • To evaluate the impact of nitrate on landfill processes.

Main Methods:

  • Utilized 10-L reactors simulating landfill conditions.
  • Fed reactors with nitrate (NO3-N) every 48 hours for 19-59 days.
  • Monitored nitrate depletion, methane production, leachate pH, and denitrifying bacteria populations.

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Main Results:

  • Nitrate was depleted within 48 hours in actively decomposing refuse.
  • Nitrate addition temporarily inhibited methane production, with recovery upon cessation.
  • Denitrification rates decreased in well-decomposed refuse but were stimulated by acetate or fresh refuse.
  • No significant ammonium production via dissimilatory nitrate reduction was observed.
  • Denitrifying bacteria populations decreased over time but responded rapidly to nitrate addition.

Conclusions:

  • Landfills are technically viable as bioreactors for converting nitrate to nitrogen gas.
  • This process offers a sustainable nitrogen management solution for landfills.
  • Further research can optimize conditions for enhanced denitrification in landfill environments.