Equipment and process of decontamination by washing of heavy metal polluted soils

The process uses a suitable mixing and shredding equipment where the contaminated soil together with the washing solution containing potassium salts of humic acids and chitosan is introduced into the attrition chamber. The stirring of the mixture in the attrition chamber is performed with 12 mixing blades arranged on a rotating shaft that is driven by an electric motor. This decontamination equipment ensures a high contact of the soil particles with the washing solution, which leads to high efficiency. By using it, the need for soil sorting on small particle size prior the decontamination is eliminated. Also, the process is ecological due to the nature of the used washing agents.