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  11. Long-term Investigation Of Methane And Carbon Dioxide Emissions In Two Italian Landfills

Long-term investigation of methane and carbon dioxide emissions in two Italian landfills

L Brilli1, P Toscano1, F Carotenuto1

  • 1National Research Council of Italy, Institute of BioEconomy (CNR-IBE), Firenze, 50145, Italy.

Heliyon
|April 22, 2024

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View abstract on PubMed

Summary
This summary is machine-generated.

Landfill emissions of carbon dioxide (CO2) and methane (CH4) were measured using eddy covariance (EC). Climate factors significantly influenced these greenhouse gas (GHG) fluxes, with management practices altering the overall GHG balance.

Area of Science:

  • Environmental Science
  • Atmospheric Chemistry
  • Geochemistry

Background:

  • Landfills are significant sources of greenhouse gases (GHGs), necessitating accurate emission assessments for effective climate impact mitigation.
  • Reducing uncertainty in GHG emission accounting requires precise measurements from landfills under diverse climatic and management conditions.

Purpose of the Study:

  • To investigate the relationship between climate drivers and carbon dioxide (CO2) and methane (CH4) fluxes at various time scales in two Italian landfills.
  • To assess the overall GHG balances of landfills, incorporating biogas extraction and energy recovery components.

Main Methods:

  • Utilized eddy covariance (EC) technique for high-frequency, long-term measurements of CO2 and CH4 fluxes over one year.
  • Collected data from two Italian landfills (Giugliano and Case Passerini) with contrasting management strategies (gas recovery vs. no management).
Keywords:
Biogas recoveryEddy covarianceGHGs budgetGHGs emissions

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Main Results:

  • Giugliano landfill exhibited higher net atmospheric CO2 source (5.7 ± 5.3 g m⁻² d⁻¹) and CH4 fluxes (6.0 ± 5.7 g m⁻² d⁻¹) compared to Case Passerini (2.4 ± 4.9 g m⁻² d⁻¹ and 0.7 ± 0.6 g m⁻² d⁻¹, respectively).
  • Fluxes were primarily influenced by thermal variables and water availability, with their importance varying by time interval.
  • Barometric pressure changes (dP/dt) affected CH4 fluxes, with reductions observed at dP/dt > 0 and increases at dP/dt < 0.

Conclusions:

  • Climate variables, particularly thermal factors and water availability, are key drivers of landfill gas fluxes.
  • Landfill management significantly impacts the overall atmospheric GHG balance, with gas recovery systems showing potential for reduction.
  • Accurate, high-frequency flux measurements are crucial for understanding landfill emissions and informing climate mitigation strategies.
Landfill management