METHOD FOR RECLAMATION OF OIL-CONTAMINATED LANDS Russian patent published in 2023 - IPC B09C1/00 B09C1/08 

FIELD: soil recultivation.

SUBSTANCE: invention relates to methods for the restoration of contaminated soil and the reclamation of oil-contaminated natural and commercial soils with the incorporation of oil into the organic matter of soils and is intended for areas of oil spills on marshy soils with viscous oil that cannot be pumped out or washed off. The technical problem is to create such a technical solution that will accelerate the transformation of hydrocarbons in the entire volume of the soil. The method for reclamation of oil-contaminated lands includes agrotechnical mechanized processing of contaminated soil, carried out by diluting the contaminated layer of the underlying layers of clean soil directly at the spill site, followed by the use of components that intensify the processes of transformation and oxidation of hydrocarbons with the formation of protohumic substances – incorporation into humus, such as mineral fertilizer, oxygen compound and bentonite clay. Calcium peroxide is used as an oxygenating compound. The dose of calcium peroxide for the oxidation of terminal C atoms in the molecules of liquid hydrocarbons C12-C16 is 1-3% of the oil reserves. Bentonite is used as a catalyst for polymerization reactions at a dose of 50-100 g/m². The calculation of the depth to which it is necessary to carry out mechanized agrotechnical tillage, when used on soils with viscous oil and on marsh soils, in order to achieve the standard values of the permissible residual oil content in the soil, is carried out according to the formula h_p = (p_i x h_cont x (c_i/c_sought))/ p_av, where h_pr is the depth of agrotechnical processing, m; h_cont is the depth of the contaminated layer, m; p_i is the density of the contaminated layer, t/m³; p_av is the average density of the pure underlying layer, t/m³; c_i is the concentration of oil products in the contaminated layer, g/kg; c_sought is the concentration of oil products to be achieved, g/kg.

EFFECT: expansion of operational possibilities for recultivation of oil-contaminated lands by applying in practice the optimal parameters of recultivation technology and solutions that can lead to an acceleration of the transformation of hydrocarbons in the entire volume of the soil.

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