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Geostream UK
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  5. Geostream - In-Situ Thermal Technology

Geostream - In-Situ Thermal Technology

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Fast and Effective Treatment of Lasting Contamination. In-Situ Thermal Remediation is often the most effective treatment for lasting contamination, achieving strict contaminant reduction targets faster than alternative technologies. It works well on sites with complex geologies – such as fractured rock or where there are multiple sand lenses within clays – and on operational sites where excavation of soils is not viable. Through our exclusive partnership with Canadian specialists McMillan-McGee Corp, we’re able to provide unrivalled in-situ thermal technology to UK projects.
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How It Works
McMillan-McGee (Mc2)’s patented ET-DSPTM thermal heating process introduces electrical current into contaminated soil via electrodes, which are strategically placed throughout a contaminated zone.

Using three-phase power, it transfers current to each individual electrode and heats the subsurface.

The heat transfer mechanism volatilises contaminants in-situ or drives them to extraction wells via. a guided steam front.

Electrical heating increases the temperature of the soil and groundwater by conducting current through the interstitial water that fills the porosity voids in soil.

ET-DSP benefits from the three dominant mechanisms of heat transfer:

  • Conduction
  • Convection
  • Electrical heating

Application of convective heating, accomplished by injecting water at controlled rates into the ends of the electrodes where the electrical field has the highest density, makes ET-DSPTM more effective than rival technologies.

Without convective heat transfer, conventional remediation processes are limited by retardation of the contaminant in-situ, especially in fine sediments and clays.

This means primary technologies must be operated for long periods and may not achieve clean-up standards in low-permeability soils or where the vapor pressure of the contaminant is low.

The process can take years, whereas ET-DSP achieves a significant reduction in contaminant within 3 to 8 months. So far, it has been used successfully on >140 sites worldwide.