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Optimizing landfill aeration strategy with a 3-D multiphase model.

André G van Turnhout1, Hans Oonk2, Heijo Scharff3

  • 1Geoscience & Engineering Department, Faculty of CiTG, Delft University of Technology, Stevinweg 1, 2628CN Delft, Netherlands.

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|November 25, 2019
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Summary

Landfill aeration strategies are compared using a 3-D model to shorten aftercare. Injection improves air flow, while extraction offers homogeneous oxygen supply, with optimal strategies involving alternating wells spaced up to 20m apart.

Keywords:
3-D multiphase modelAerationDesign criteriaField scaleLandfillsWaste treatment

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Area of Science:

  • Environmental Engineering
  • Geotechnical Engineering
  • Waste Management

Background:

  • Landfill aftercare requires significant time and resources.
  • Effective landfill aeration strategies are hindered by poor understanding of gas and water transport.
  • Developing tools for optimal aeration is crucial for reducing environmental and financial burdens.

Purpose of the Study:

  • To develop a tool for determining optimal landfill aeration strategies.
  • To compare different aeration strategies based on air distribution using a 3-D multiphase model.

Main Methods:

  • A 3-D multiphase model was developed and calibrated with field data.
  • Laboratory experiments provided parameter values for the model.
  • Scenario analyses were conducted for a case study landfill.

Main Results:

  • Injection strategies achieved higher air flow volumes, particularly at the landfill base.
  • Extraction strategies provided more homogeneous oxygen distribution throughout the waste.
  • Well spacing is a critical design criterion; distances over 20m reduce treatment effectiveness.

Conclusions:

  • A combination of alternating injection and extraction wells, spaced a maximum of 20m apart, appears to be the optimal aeration strategy.
  • The developed model accurately describes gas flow under extraction.
  • This research provides a tool to optimize landfill aeration for reduced aftercare periods.