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Examining Screening-Level Multimedia Models Through a Comparison Framework for Landfill Management.

Zunaira Asif1, Zhi Chen2

  • 1Concordia University, 1455 de Maisonneuve W, Montreal, QC, Canada, H3G 1M8.

Environmental Management
|September 7, 2015
PubMed
Summary
This summary is machine-generated.

This study compared two models for benzene transport in landfills. The analytical environmental multimedia model (AEMM) showed better accuracy than the fugacity model for predicting benzene fate and transport.

Keywords:
BenzeneEnvironmental multimedia modelFugacityLandfillRemediationRisk assessment

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Area of Science:

  • Environmental Science
  • Chemical Engineering
  • Geoscience

Background:

  • Benzene is a common environmental contaminant released from landfills.
  • Accurate modeling of benzene transport and fate is crucial for environmental risk assessment.
  • Existing models require validation and comparison for effective application.

Purpose of the Study:

  • To compare the predictive capabilities of a fugacity model and an analytical environmental multimedia model (AEMM) for benzene.
  • To evaluate the fate and mass transfer of benzene in a landfill environment.
  • To assess the distribution and transport mechanisms of benzene in air, soil, and groundwater.

Main Methods:

  • Utilized a fugacity model (Level I and II) and an analytical environmental multimedia model (AEMM).
  • Compared model predictions based on average concentrations and partitioning behavior of benzene across air, soil, and groundwater.
  • Analyzed diffusion gas flux and advection of gas and liquid as transport mechanisms.

Main Results:

  • Both models identified diffusion gas flux as the predominant benzene release mechanism from landfills.
  • Fugacity modeling indicated ~99.6% of benzene flux distributed into the air.
  • AEMM showed higher accuracy compared to experimental data than the fugacity model, which is a single unit box model.

Conclusions:

  • Fugacity models serve as effective screening tools for initial benzene assessment.
  • AEMM provides more accurate predictions for benzene transport and fate, suitable for strategic decision-making.
  • Combining fugacity screening with detailed AEMM analysis enhances remediation strategies for benzene-contaminated landfills.