In gas stations, car washes, sewage treatment plants, or similar facilities, residues, especially oil-contaminated minerals, collect in the sand trap.
Intensive activities can be seen in more and more regions around the world in an effort to reclaim areas that were contaminated by crude oil in the past.
In the treatment of oil-contaminated soils, additives such as surfactants are added to the wash waters in addition to the wet mechanical cleaning processes used in soil washing plants. Thermal or biological processes can also be used to complement this.
As with the soil washing plants, the treatment plants are also used for oil-contaminated soils in order to clean the largest possible mineral fraction of the soil to such an extent that it can be reused and only the smallest possible fraction of material remains to be landfilled.
