At a petrochemical site in Europoort, HMVT successfully completed an extensive NAPL layer remediation within the estimated timeframe. The NAPL layer consisted of approximately 6,500 m2 of crude oil and was up to 80 cm thick in some places. It was located at a tank farmyard. The NAPL layer was also present under the tank.

Remediation

The remediation was carried out through Multi-phase Extraction (MFE). In MFE soil air, contaminated groundwater and the NAFL layer are removed through a network of underground extraction filters by applying high negative pressure. In total, 440 extraction filters were installed at the location. Some of the filters were placed under the tank during the renovation of the tank mound. The tank was jacked up at the time. Through NAPL layer measurements and close monitoring of the process parameters, a continuous effort was made to use the installed system as optimally as possible. The extracted soil air was purified with two catalytic oxidation units. The contaminated groundwater was discharged into the industrial sewer via an oil-water separator. The pure product was periodically extracted from the oil-water separator and transported to a processor.

Result

During a period of 3 years, more than 10.000 kg of crude naphtha was removed from the soil. After those 3 years, the NAPL layer had disappeared, and the volatile components were remediated from the groundwater. After a stop test, DCMR approved the achievement of the remediation objectives. HMVT is proud to have been able to complete this extensive remediation with good results.

More information

Please contact Ted Vendrig.