The advantages of physico-chemical treatment

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Courtesy of DEC NV (DEME Environmental Contractors)

Physico-chemical soil treatment is an effective technique to clean contaminated soils, removing a wide range of both organic and inorganic contaminants. Contaminants adhere to the fine-fraction of the soil, such as organic matter and clay/silt.

The principle of the method utilizes the difference in grain-size and density of the materials and separates the different fractions by means of screens, hydrocyclones and upstream classification. Pollutants in the input material are separated and transferred from the sand and gravel fractions to a filter-cake residue which is then analysed and disposed of to the Augean landfill facilty. Cleaned (building) materials are then available for secondary use.

Physico-chemical soil treatment can be applied to the treatment of contaminated soils, sandy sediments, sewer sediments and construction debris. The process is ideal for soils with a high granular content, typically below 30% w/w fines (<63µm). Physico-chemical soil treatment can remove a wide range of chemical contaminants including most organic contaminants such as TPH, PAH’s and PCB’s and inorganic contaminants such as Heavy Metals and Cyanides.

Physico-chemical soil treatment is a technique that can be used in fixed soil treatment centers as well as in mobile soil treatment plants. In this way, soil treatment becomes available for sites where on site treatment is a viable option.

Soil treatment can be used not only to clean soils, but also as a pre-treatment to reduce contamination to acceptable levels before landfilling.

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