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Evaluating fugacity models for trace components in landfill gas.

Sophie Shafi1, Andrew Sweetman, Rupert L Hough

  • 1Integrated Waste Management Centre, Sustainable Systems Department, Building 61, School of Industrial and Manufacturing Science, Cranfield University, Cranfield, Bedfordshire MK43 0AL, UK.

Environmental Pollution (Barking, Essex : 1987)
|April 11, 2006
PubMed
Summary

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A fugacity model accurately predicted benzene and 1,3-butadiene in landfill gas. This approach helps assess landfill emissions and requires better biotransformation data and understanding of gas extraction effects.

Area of Science:

  • Environmental Science
  • Geochemistry
  • Chemical Engineering

Background:

  • Landfill gas composition is crucial for risk assessment.
  • Accurate source term estimation is needed for landfill gas models.
  • Volatile organic compounds (VOCs) are key components of landfill gas.

Purpose of the Study:

  • To evaluate a fugacity approach for predicting VOCs in landfill gas.
  • To reconcile waste loadings with observed gas concentrations.
  • To generate source terms for landfill gas risk assessment models.

Main Methods:

  • Utilized a dynamic Level II fugacity model (SOILVE) adapted for landfills.
  • Constructed an evaluative environment using data from UK test cells.
  • Simulated anaerobic conditions over a 10-year period.

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Main Results:

  • The fugacity approach showed greatest utility for benzene and 1,3-butadiene.
  • Modelled concentrations for benzene and 1,3-butadiene fell within observed ranges.
  • Predicted concentrations for benzene: 95,300 µg m⁻³, 1,3-butadiene: 43 µg m⁻³.

Conclusions:

  • Fugacity modeling is a viable tool for landfill gas risk assessment.
  • Further research needed on biotransformation data and waste partitioning.
  • Understanding gas extraction flux is critical for accurate concentration predictions.