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In-Situ Thermal Desorption of Hydrocarbon-Contaminated Soil, Saint-Pieters-Leeuw, Belgium

Horizontal heating wells treated hydrocarbon contamination inaccessible from the surface at a Derbigum (Imperbel) site, reducing concentrations from 14,000 mg/kg to below 300 mg/kg despite rainwater infiltration.

SITE DESCRIPTION

       Treated Volume

  800 m³ of contaminated soil (1,440 T)

          Thermal technology

   In-Situ Treatment (ISTD) 

       Main contaminant

Hydrocarbons (mineral oils, TPH)

        Site challenges

Floating oil layer requiring 45-90 days of heating; treatment duration extended by rainwater infiltration in the treatment zone

        Project Timeline

2013



SOLUTION

          Treatment Method

In-Situ Thermal Desorption with coaxial heating tubes

          Treatment program

13 heating wells, target temperature 200°C (or 100°C over 2 weeks)

         Contaminated Vapors Management

Not specified in source document

       Process control

32 thermocouples · monitoring of standard emissions parameters (CO, CxHy, CO2, O2, NOx)


RESULTS

✅         80,000 m³ of contaminated soil treated.

✅          Floating oil layer eliminated after 55 days of heating; concentration reduced from 14,000 mg/kg to below the 300 mg/kg target

✅         Treatment objectives reached for Derbigum (Imperbel), with consultant Ibeve, despite rainwater infiltration





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