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

FIELD: ecology.

SUBSTANCE: invention relates to environmental protection in field of oil and gas activities and oil and gas industry, in particular to microbiological processing of oil sludge and oil contaminated soil using water recycling sludge for process intensification. Disclosed method comprises selection of composition of oil sludge with water content from 0.01 to 99.9 %, introduction of oil sludge organic components, formation of porosity of processed material, adding correctors of reaction medium to pH medium equal to 5.5-8.0, creating conditions of penetration into material of oxygen, completion of multicomponent reaction of oil-oxidising microorganisms with variable structure compost composition, conversion of said composition of oil sludge and oil contaminated soil into high-humus soil. In oil sludge and oil contaminated soils, blowing components used are plant wastes from greenhouse and wood processing wastes in amount of 55 ± 5 wt%, and introduction of carriers of microflora, adapted to decomposition of contaminants contained in oil sludge and oil contaminated soils, particularly excess active sludge from treatment facilities of gas processing enterprises, which is a carrier hydrocarbon decomposing microorganisms in an amount of 10 ± 1 wt%, and sludge recycling water supply, which represents biogrowth grids and walls of cooling towers as carrier of microflora, adapted to decomposition of toxic sulphur-containing compounds present in oil sludge and oil contaminated soils, as well as for power amplification and acceleration of soil hydrocarbon decomposing microflora in amount of 5 ± 1 wt%, as well as for processing oil sludge and oily soils with low values of pH < 5.5, adding sludge from CHP with pH approximately equal to 10.0-11.0, then produced mass in collars with height up to 2.5 m and width of base to 5 m aeration is carried out when concentration of carbon dioxide in gas drawing more than 7 % by way of stirring, and degree of decomposition of oil products is determined by formula: $$\text{S}=\text{s}\cdot {\text{e}}^{-\frac{\tau }{\text{T}}}$$ , where S is degree of decomposition of petroleum products, %; s is initial content of oil products; τ is current time of processing in days; T is time constant of process of processing in days, and time of maximum decomposition of oil products is determined by formula: t approximately equal to 3·T, where t is time, when processing enters zone of 5 % of steady-state value content of oil products, i.e. t is time of end processing process.

EFFECT: technical result is reduction of duration and high quality of processing oil sludge and oily soils, process of processing without using large volume of scarce and expensive components by replacing with available materials produced by refining industry, as well as determination of time of end of processing process.

1 cl, 2 tbl, 7 dwg