METHOD OF CLEARING SOIL CONTAMINATED BY OIL AND OIL PRODUCTS Russian patent published in 2012 - IPC B09C1/02 

FIELD: process engineering.

SUBSTANCE: invention relates to ecology, particularly, to clearing of soils contaminated by oil and oil products. Proposed method comprises washing contaminated soil by detergent fluid, its preparation using water and chemical agent, mixing said detergent fluid with soil to be cleared, mixing obtained suspension, settling it to remove floating oil contaminant and extracting the product of contaminated soil cleared by draining waste detergent fluid. To this end, said detergent fluid in every subsequent soil washing cycle is prepared from waste detergent fluid from previous cycle. For this, waster and chemical agent are added thereto to reach their initial content. Commercial mix of polyethylene glycol ethers of monoalkyl phenols is used as said chemical agent. After mixing detergent fluid with contaminated soil, obtained suspension is subjected to microware radiation and settled. After removal of floating oil contaminant from settled suspension surface and draining of waste detergent fluid, the extracted product of cleared contaminated soil is mixed with standard clean soil in amount that ensures tolerable concentration of oil contaminants in soil.

EFFECT: reduced consumption of detergent fluid, simplified process.

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