Method of reclamation of oil-contaminated soil

FIELD: agriculture.

SUBSTANCE: invention relates to the field of environmental protection and can be used in the rectification of the consequences of the oil spill on the soil. The method consists in mixing the oil-contaminated soil, spread over the surface of freshly ploughed uncontaminated field with the thickness layer from 1/10 to 1/6 of the ploughing depth, to the full depth of ploughing using the tiller several times.

EFFECT: invention enables to restore oil-contaminated soil without application of additional neutralising foreign substances and reagents.

 

The scope to which the invention relates.

The invention relates to the field of environmental protection and can be used for reclamation works of oil polluted soils.

The level of technology

There are a large number of different methods and methods of remediation of contaminated soils, consisting in the removal of polluted soil. The main ones are the methods with the use of hydrocarbon-oxidizing microorganisms, agrochemical, phytoremediation ways, either separately or in combination (1. RU # 2403102 from 15.05.2009; 2. EN 2440199 dated 11.06.2010; 3. EN 2421291 from 27.01.2010; 4. EN 2320430 from 22.12.2006; 5. EN 2253209 from 06.11.2003; 6. 39-1.13-056-2002; 7. WFD 39-1.13-057-2002).

Closest to the claimed invention method is to reclamation collected in a separate place of oil-contaminated soil (8. Polyakov S. The elimination of the consequences of large-scale oil spills on-site oil storage coal mine. / Poles S.N., Lushnikov, S. C., V.M. Volkov, Villains S. C. // Ecology and industry of Russia. - 2005. No. 3.). This method is to lay the collected contaminated soil layer of 30 cm and the introduction of fertilizers and aluminosilicates according to a certain scheme, and sawdust. Later during the warm season soil moistened by sprinkling water from a drainage ditch through the level of humidity of 70% and weekly mixed light bulldozer and enriched sawdust.

General shortcomings of the above methods of remediation are long term recovery, making the cleaned soil additional neutralizing oil substances, reagents, biological products.

Disclosure of inventions

The task of the invention is the simplification of reclaiming actions.

Technical result achieved when the task is to direct the restoration of oil polluted soils without making additional neutralizing foreign oil substances and reagents, except the soil.

The essential features that characterize the invention

Restrictive: the lay of the collected contaminated soil evenly.

Distinctive: uniform spreading of contaminated soil on the surface of ploughed uncontaminated soil layer from 1/10 to 1/6 of the depth of plowing, followed by stirring of the soil in all plowed deep.

It is known that after the cleanup of soils from oil residual contamination at levels up to 15% has no significant negative impact on the growth and development of plants Phalaroides arundinacea family Roaseae (9. RU # 2440199 dated 11.06.2010).

It is known that soil contamination with oil level from 1.5% to 5% are possible landing Zernov the crops (wheat, barley, oats, carrot and dill (10. Conceicao A.A. Development of new sorbents and adhesion skimmers to collect spills of hydrocarbons: Disclocated. Sciences. The Ufa. 2008).

It is established that the growth of plants is crucial to the degree of soil pollution (11. Zilberman MV Poroshina E.A., Zyryanov E.V. Biotesting of soils contaminated with oil and oil products. - UHF Ural Institute of Ecology, Perm, 2005; 12. Kolesnikov Biodiagnostic ecological condition of soils contaminated with oil and oil products. / S.I. Kolesnikov, K.SH Kazeev, Ms. V. Val'kov and other Rostov - on-don: publishing house CJSC Rostedt, 2007).

It is also known that after three to clean up contaminated soil oil is not completely cleared, however, the germination of seeds of agricultural crops is not different from the germination of seeds planted on a clean, uncontaminated soil, and the height growth of plants on recuperando repeatedly soil is much greater than the height of the plant to be planted in uncontaminated soil. High crop yields due to complete processing of oil residue in the treated soil microflora of the soil, which has a favorable effect on the growth of crops (10. Conceicao A.A. Development of new sorbents and adhesion skimmers to collect spills of hydrocarbons: Disclocated. Sciences. Ufa 2008. - S-253).

Given the fact that full cleanup of oil-contaminated soil using special sorbents and reagents unattainable, and a small amount of oil in the soil is beneficial to crop yields, it is proposed not to clean the contaminated soil from oil and mix with uncontaminated soil to achieve an acceptable level of concentration of oil in the soil from 1.5% to 15% in order to restore natural vegetation.

The implementation of the invention

The method is as follows. From the surface of the soil contaminated with oil, remove the remnants of oil using sorbents. Near the contaminated soil is plowed and treated with cultivator uncontaminated field, which area multiplied by the depth of plowing was equal from 5/6 to 9/10 of the volume of contaminated soil. Contaminated oil soils removed from the spill and evenly spread on the surface of ploughed fields with a layer thickness of from 1/10 to 1/6 of the depth of plowing and mixed with freshly plowed earth in the depth of plowing, for example, a cultivator. To achieve a uniform distribution of contaminated soil over the entire surface and the depth of the plowed field processing cultivator produce several what about the times. Particles ploughed land, being a good natural sorbent, will absorb some oil from the particles of oily soil, reducing the oil content to an acceptable level of concentration of oil in the soil from 1.5% to 15%needed to restore the natural vegetation.

Thus, the restoration of oil polluted soils produced without the introduction of additional neutralizing foreign oil substances and reagents.

The method of purification of oily soil, consisting in the collection of spilled oil from the surface of the soil sorbents and the collection of oily soil recovery, characterized in that the contaminated oil soils spread on a flat surface ploughed uncontaminated field layer thickness of from 1/10 to 1/6 of the depth of plowing, and stirred the whole depth of tillage with cultivator several times.



 

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2 tbl

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2 tbl

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3 dwg

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