METHOD OF CLEANING SOIL FROM PETROLEUM CONTAMINANTS Russian patent published in 2004 - IPC

FIELD: cleaning and treatment of soil.

SUBSTANCE: proposed method includes mechanical extraction of contaminated soil followed by bringing it in contact with water in mode of mechanical floatation in fluidized bed of solid phase of soil in non-uniform magnetic field at gradient of 3 to 150 Oe/m at addition of surfactants treated preliminarily in layer of ellipsoid charge revolving in opposing electromagnetic fields. Average intensity of non-uniform magnetic field in floatation zone ranges from 100 to 3000 Oe. Used as surfactants are microorganisms and products of their processing, for example microorganisms of activated silt of biological purification works. It is good practice to preliminarily treat surfactants in layer if ellipsoid charge made from ferromagnetic material, for example in form of flattened iron rings continued for 1-30 min.

EFFECT: increased degree of cleaning soil from petroleum products.

5 cl, 3 ex