Mineral oil pollution in Woudenberg


De Heygraeff is a care institution in Woudenberg for the mentally and physically disabled. Attention and care are essential, preferably in peaceful surroundings. Therefore, the mineral oil polluted soil in the immediate vicinity is best handled by electro-bioreclamation. That’s what we did for the customer from July 1996 until April 1999. About a thousand cubic meters of material, consisting of fine sand with a humic-rich layer of loam, was treated. 

Our approach

Location Woudenberg

In-situ electro-bioreclamation was used to address the initial load of 9,000 kilos of polluted material. During the intensive phase, we removed 7,800 kilos; during the extensive phase, we removed another 1,000 kilos. Altogether an efficiency of 95% pollution removal. The remaining contamination is immobile and is being biodegraded.

There is no danger of new or increased concentrations of pollutants or risks to humans and the environment. In the summer of 1999, the province of Utrecht declared: cleanup was satisfactorily completed.

Technical details

Remediation Methods
- In situ remediation
- Tank Removal
- Electro Bio Reclamation (Organic)
- Soil Vapour Extraction
- Groundwater Extraction
- Biological Degredation

General Data
Volume of soil & groundwater: intensive 1000 m3, extensive 70 m3
Remediation depth: 4 m b.g.s.
Start intensive phase: July 1996
Start extensive phase: August 1997
End intensive phase: August 1997
End intensive phase: April 1999

Remediation Data
Type of contaminants: Mineral Oil
Product removed: 8800 kg
Nutrient Injected: 85 kg 
Temperature: 80 °C
Extraction rate soil vapour: 225 m3/hr
Extraction rate groundwater: 2 m3/hr
External environmental supervision: Verschueren Environmental Consultancy (VEC)