Soil remediation work, undertaken by VALGO, has made it possible to treat soil contaminated by PCB leaks on the ground of a former electrical substation in the Hautes-Pyrénées department.
The thermal desorption on site, the technique used on this pollutant, was a first in France, on such an important soil matrix by an on-site process.
Key aspects of the project:
On this site, the pollution was spread over two zones: a tank zone on which the pollution was concentrated in a few locations but up to 3 meters deep and a surface pollution.
After a laboratory study to determine the conditions (temperature and duration) necessary for the desorption of the pollutant, pilot tests were carried out on a sample before the installation of a secure, semi-automated system, assisted by daily human monitoring to make the most of the installation.
Types of pollutants: PCB and HCI
Treatment: thermal desorption in situ
Duration of the works: 48 months