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In-Situ Thermal Remediation Beneath the International School of Brussels

Haemers successfully remediated a fuel oil hotspot located beneath an occupied school building using In-Situ Thermal Desorption (ISTD). The treatment reduced hydrocarbon concentrations by more than 99.7%, achieving all remediation targets while fully complying with atmospheric emission standards.

SITE DESCRIPTION

       Treated Volume

212 m³ of contaminated soil  

          Thermal technology

In-Situ Thermal Desorption (ISTD)  

       Main contaminant

TPH (Mineral Oil), BTEX, PAHs  

        Site challenges

Contamination located beneath an existing school building at 9 m depth; confined urban environment; strict environmental 

        Project Timeline

31 days of heating (2014)  



SOLUTION

          Treatment Method

  In-Situ Thermal Desorption using electrically heated wells

          Treatment program

  Treatment of 212 m³ (363.6 tonnes) using 14 heating tubes, with a target temperature of 200°C over 31 days

         Contaminated Vapors                          Management

Extraction and treatment of vapors to comply with atmospheric emission standards throughout the remediation  

       Process control

Continuous temperature monitoring and process control to ensure uniform heating and achievement of remediation objectives  


RESULTS

✅          >99.7% reduction of hydrocarbon concentrations

✅           Final TPH concentration below 50 mg/kg (target: <300                          mg/kg); no detectable BTEX or PAHs

✅           Treatment completed on schedule, within budget, and in full                compliance with emission standards




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