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

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil industry, more specifically to methods for improvement of ecological state and return to economic use of lands contaminated by oil products, in particular oil sludge and oily soils. Method of treating oil sludge and cleaning oil contaminated soil involves selection of composition of oil sludge with water content from 0.01 to 99.9 %, introduction of organic components into oil sludge, formation of porosity of treated 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. Organic components introduced into oil sludge or oil contaminated soil are organic fertilisers and sunflower husks. Mineral fertiliser is added to formed mixture to boost nutrition and accelerate active propagation of soil microflora, primarily hydrocarbon-decomposing microorganisms. Method includes adding to obtained material Ca-containing additives to achieve pH of medium equal to 5.5-8.0, laying produced mass onto a substrate from sunflower husks and organic fertilisers in heaps with height of up to 4 m and width of base of up to 7 m, every 15-20 days for 1-3 months performing aeration of compost by re-laying heap. Sunflower husks make up not less than 25 % of total volume of heap. Using given method improves process of biodegradation.

EFFECT: invention enables to clean oil sludge and oil contaminated soils using sunflower husks, using it to replace other vegetable organic residues, reduces consumption of scarce cattle manure, reduces consumption of materials for cleaning, reduces cost and speeds up cleaning, improves, by using sunflower husks as biological and physical agent conditions (temperature, humidity, aeration) for biodecomposition of hydrocarbons thus increasing efficiency of cleaning.

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