In-situ thermal remediation under an inhabited residential apartment building

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Courtesy of McMillan-McGee Corp.

ET-DSP Heat Transfer Mechanisms

The heat is directed into the target volume from the electrode wells that are designed to balance the heat transfer mechanisms of electrical heating with convection to achieve rapid and uniform heating. Notice that heat flow outside the target volume has been minimized.

Thermally Enhanced Remediation Mechanisms

  • Vapourization of volatile and semi-volatile organic compounds (Dalton’s Law of partial pressures)
  • Dynamic Stripping (Henry’s Law Constant)
  • Solubility of PAH Increases With Temperature (remove more mass with the water phase).
  • Accelerated Bioremediation (Thermophilic metabolism).
  • Mobility Improvement (Viscosity reduction and thermally enhanced absolute permeability)
  • Thermal Hydrolysis (Arrhenius temperature rate.)

Thermal Characteristics of Contaminants

  • Benzene has a high vapour pressure that increases exponentially with temperature.
  • Henry’s Law Constant for Benzene (air-water partitioning coefficient) increases by 15 to 20 times as temperatures rise from 10 to 100 degrees Celsius.
  • The biodegradation rate of Benzene approximately doubles for every 10 °C increase in temperature.

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