METHOD OF DECONTAMINATING WASTE DRILLING MUD AND SOIL CONTAMINATED WITH OIL PRODUCTS Russian patent published in 2016 - IPC B09C1/08 C09K17/06 C09K17/08 C09K101/00 E21B21/01 E21B21/06 

FIELD: oil industry.

SUBSTANCE: invention relates to methods for rehabilitation of lands contaminated by oil products. Waste drilling mud is excavated from earth storages onto a flat surface and dried at the sun. Mixture of phosphogypsum and glauconite is introduced for binding heavy metal salts in hardly soluble forms and thickening the mud and sorption of heavy metal salts. Mass is dried in natural conditions till the moisture content of 8-14 % and reduction of its volume 6-8 times. Mixture is stirred by a bulldozer equipped with a milling-rotary working element, with subsequent placement and sealing in storages, the bottom of which is covered with the glauconite layer of 20-30 cm thick. Then it is covered with a 20-30 cm thick glauconite layer and with a mineral soil layer with a thickness of not less than 0.5-1.0 m. Over it a fertile layer is put with the thickness of 20-40 cm enriched with glauconite. Storages are made on any types of soil with deposition of ground waters of not less than 8-10 m and at the underlayer thickness from 15-20 m and more.

EFFECT: provided is reduced content of heavy metal salts and oil products in waste drilling mud and oil-contaminated soil with simultaneous simplification of decontaminating technology.

1 cl, 1 dwg