Remediation Value: £350,000
Project: Removal of predominantly creosote contamination from a former timber treatment facility. Steam Enhanced Remediation (SER), Free Product pumping, Dual Phase Vacuum Extraction (DPVE) and Air Sparge (AS) targeting remediation of Dense Non-Aqueous Phase Liquids (DNAPL) and Semi-Volatile impacted groundwater and soils.
The remediation objectives required the complete removal of DNAPL and betterment of contaminant concentrations in both soils and groundwater. The maximum DNAPL thickness was 700mm. During the installation phase it was evident that the plume area was larger than expected, the area increased from 600m2 to 1100m2. The flexibility of the equipment allowed the treatment area and remediation system to be redesigned accordingly.
The treatment resulted in subsurface temperature increasing from an average of 90oC to 59oC. Heavily impacted areas were heated to >95oC to allow Hydro Pyrolysis Oxidation, a process where oxygen becomes a powerful chemical oxidant at temperatures greater than 90oC. DNAPL pumps and DPVE were used to remove the mobilised Free Product. A total of over 4500kg was removed.
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