METHOD CLEANING OIL SLUDGE AND OIL CONTAMINATED SOIL Russian patent published in 2016 - IPC B09C1/10 B09C1/08 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil industry, specifically to improvement of ecological condition and reclamation of lands contaminated with oil products, in particular, oil sludge and soil contaminated with oil products (oily soil). Proposed method comprises selection of composition of oil sludge with water content from 0.01 to 99.9 %, adding to oil sludge organic components, formation of porosity of processed material, creation of conditions of penetration of oxygen into material, completion of multicomponent interaction of oil-oxidising microorganisms with structure-variable compost composition, conversion of said composition of oil sludge and oil contaminated soil into high-humus soil. In oil slime organic components added are plant residues, which can be milled above-ground part weeds and crops, straw, chaff, husks, straw manure, peat, spent compost of champignons, active sludge of treatment facilities of industrial enterprises, in which prior to adding to oil sludge or oily soil glauconite or compound mineral-organic granular fertiliser is added based on glauconite in amount of 0.8-1.0 kg per 1 ton of plant residues to boost nourishment and speed up active propagation of soil microflora, primarily hydrocarbon-decomposing microorganisms, closing volume weight of processed oil sludge or oily soil by adding said plant residues in ratio of 1:1, to achieve acidity (pH) of medium less than 8.0, method includes adding to obtained material phosphogypsum in a volume defined by relationship: , where V_f, V_s respectively denote volume of phosphogypsum and oil sludge, m³; ρ_f, ρ_s respectively denote density of phosphogypsum and oil sludge, kg/m³; pH_f, pH_s respectively denote acidity of phosphogypsum and oil sludge. Then produced mass is laid in piles with height up to 4 m and width of base of up to 7 m, in which is placed in staggered order every 1-1.5 m in horizontal and vertical planes perforated pipes, intended for removal of carbon dioxide, released during biodegradation of hydrocarbons.

EFFECT: use of present invention reduces cost of cleaning oil sludge and soil purification from oil contaminated soil.

1 cl, 1 dwg