This type of treatment involves the decontamination of soil and groundwater without any movement of material to be processed. It is applied directly to the soil and the groundwater contaminated by organic pollutants without prior excavation or pumping.

Chemical oxidation is a very popular and effective technique that involves injecting an oxidizing a product in liquid or gaseous form that will come in direct contact with the contaminant, forcing its destruction or transformation into a less or non-toxic compound.

The main advantage of this technique is the reduction if not the removal of excavation and transportation costs, leading to substantial savings. Mainly indicated in the case of organic contamination under a structure, a building or a finished surface, the in-situ treatment can limit greatly the impact on the surroundings.

The choice of the technique of treatment of polluted soil depends on several factors:

  • Size of the site
  • Contaminant types
  • Soil type
  • Risk for decontamination workers
  • Presence of various structures
  • Price of the treatment

Treatments after soil excavation

The same kind of technique have been developed to be applied to the soil after their excavation. Some can be implemented on the site via temporary facilities. This offers the possibility to reuse the land after decontamination. Polluted lands are set aside and undergo biological, physico-chemical or thermal treatment. Polluted land can also be contained, stabilized or washed on site. This latter technique consists in extracting the pollutants by means of water or solvents. The liquids containing pollutants are finally treated separately.