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A multi-component two-phase flow algorithm for use in landfill processes modelling.

J K White1, D Nayagum2, R P Beaven1

  • 1Faculty of Engineering and the Environment, University of Southampton, Highfield, Southampton SO17 1BJ, UK.

Waste Management (New York, N.Y.)
|June 14, 2014
PubMed
Summary
This summary is machine-generated.

This study introduces a new finite difference algorithm for landfill modeling. The algorithm accurately simulates liquid and gas flow, crucial for understanding landfill processes and management.

Keywords:
DegradationGasLandfillLeachateModellingRecirculation

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Area of Science:

  • Environmental Engineering
  • Geotechnical Engineering
  • Computational Fluid Dynamics

Background:

  • Landfill processes involve complex multi-phase, multi-component interactions.
  • Accurate modeling of fluid flow is essential for predicting landfill behavior and environmental impact.
  • Existing models may not fully capture the coupled dynamics of liquid and gas phases.

Purpose of the Study:

  • To present a novel finite difference algorithm for the flow sub-model of the University of Southampton's Landfill Degradation and Transport (LDAT) model.
  • To decouple and rearrange liquid and gas phase flow equations for a 3D finite difference framework.
  • To incorporate non-flow processes like degradation and chemical equilibrium into the flow model.

Main Methods:

  • Developed a finite difference algorithm for landfill flow sub-modeling.
  • Decoupled liquid and gas phases from solid phase constitutive equations.
  • Integrated non-flow processes (degradation, gas solubility, leachate equilibrium) via a source term.
  • Applied the algorithm to leachate recirculation tests at the Beddington landfill project.

Main Results:

  • The algorithm successfully simulates both liquid and gas phase movement within a 3D array.
  • Demonstrated the capability to model multi-directional flow patterns that differ between phases.
  • Validated the flow sub-model's performance using real-world landfill test data.

Conclusions:

  • The developed finite difference algorithm provides a robust tool for simulating landfill fluid dynamics.
  • The model's ability to track distinct phase movements enhances understanding of landfill processes.
  • This approach is valuable for optimizing landfill management strategies, including leachate recirculation.