Method for recultivation of soil contaminated with oil and oil products

FIELD: environment protection.

SUBSTANCE: method involves introducing into soil contaminated with oil or oil products ameliorant, such as complex of aluminosilicate mineral and nitrogen-phosphate fertilizer; plowing soil to depth of at least 25-30 cm.

EFFECT: reduced soil recultivation time and decreased consumption nitrogen-phosphate additives.

2 ex

 

The invention relates to the protection of the environment, in particular for the remediation of contaminated oil and petroleum products soil.

There is a method of biological reclamation of sandy lands contaminated with oil (RF patent No. 20113095, IPC AV 79/00, publ. 20.06.98 year). Reclamation carried out in stages over three years, the first year applied sorbents, then loosened with subsequent chizelevanie.

The disadvantages of this method is that reclamation activities in these cases limited only to remove excess oil and to clean soil from the residual oil, had largely been adsorbed by soil particles and is therefore not available for the used adsorbents, you need the stimulation of hydrocarbon-oxidizing microflora of the soil, as well as prolonged periods of restoration of lands.

There is also known a method of cleaning soil from pollution by oil and oil products (patent RF №2137559, the IPC 09 With 1/08, publ. 20.09.99,), in which the soil purification is carried out by introducing a contaminated environment, peat, pre-activated mineral additives.

The disadvantages of this method are making large doses of peat, which is not economical, in addition, the major refineries are located in the Northern regions, dominated by peat soils, so additional made is of nucleobase.

The closest way we have chosen as a prototype, is a method of remediation of contaminated land (Mshinoda and other Reclamation of contaminated lands of the forest-steppe zone of Tartary // Collection of scientific works. Modern problems of the biosphere. M.:Nauka,1988, 177-191 C.). The method consists in the fact that in the contaminated soil are different types of mineral fertilizers, manure, lime, and their combinations on the background of loosening.

The disadvantages of this method are the long duration of recovery of soil (at 5% degree of soil contamination to 3 years, with 10% up to 4 years), as well as the application of high doses of mineral fertilizers, which is not economical, in addition, large doses of mineral fertilizers lead to the suppression of natural microbial nitrogen fixation in the soil.

The main technical result of the proposed method is to reduce the time required to restore soil. The proposed method allows for 5% contamination to reduce the recovery time of up to one year, and when the degree of contamination of more than 10% up to two years. When remediation of the soil reduces the amount of fertilizer 2-3 times.

The technical result is achieved in that in the method of reclamation of soil contaminated by oil and oil products, including soil mineral nitrogen-phosphorus additives and natural high is copiesthe mineral-improver with subsequent loosening of the proposed solution as a mineral-improver use mineral from the group of silicates, and loosening hold on depth not less than 25-30 see

The method is as follows.

Cooked dry mineral-improver scatter across the site in the amount of from 1 to 3 t/ha, depending on the degree of soil contamination. Simultaneously with mineral ameliorant contributing sources of nitrogen and phosphorus nutrition in the form of mineral fertilizers. Moreover, given the high level of microbial fixation of atmospheric nitrogen, the calculated amount of nitrogen fertilizer subtract the amount of fertilizer that is appropriate for the actual substance of 30-50 kg of nitrogen. For uniform distribution of mineral improver in the volume of contaminated soil, as well as to enhance aeration spend loosening ecological machine type EM-M, EM-4M and EM-BM to a depth of at least 25-30 cm, as in loosening a lesser depth in the remediation is not included all of the contaminated layer. In the case of a high degree of soil contamination, it is advisable to re-introduction of mineral improver in an amount of 1-1 .5 t/ha with subsequent loosening of the soil.

If for one season the necessary degree of degradation of petroleum products will not be achieved, then the next year the particles of the mineral-improver immediately after the temperature rise will again resume its functions stimulator microbiological activity of the soil, because the possession is t protective properties for the cells of the microorganisms, adsorbed on the surface and in the pore space of the mineral. High concentrations of hydrocarbon pollutants in the soil lead to the expansion ratio of carbon and nitrogen and partial hypoxia, which contributes to a 1.5 to 2-fold increased in oil-contaminated soil microbiological processes of nitrogen fixation. Introduction to oil-contaminated soil mineral-improver containing the composition of the trace element molybdenum complex, provides the highest level nesimmetrichnoi nitrogen fixation in the soil due to the activation nitrogenase enzyme complex nitrogen-fixing bacteria.

According to experimental data the introduction of oil-contaminated soil mineral-improver, stimulating nitrogen fixation may allow entry into the soil from the atmosphere of about 30-50 kg of nitrogen per 1 ha of soil per season. In terms of full nitrogen fertilizer is the amount of fixed biological nitrogen allows to compensate the application of 200-300 kg of NPK and 100-150 kg of ammonium nitrate per 1 hectare of cultivated area. Fertilizers applied fractional, number, receiving payment and terms are determined by soil type, nature and degree of contamination. The starting dose of nitrogen fertilizers in any soil and climatic conditions should not exceed the amounts corresponding to 100 kg of active substances is 1 ha of soil. When conducting phytomelioration at the final stage of reclamation works seeding perennial grasses carried out simultaneously with the application of potassium fertilizer in an amount corresponding to not less than 120-150 g of active substance per 1 kg of soil. Strengthening of processes of nitrogen fixation in oil-contaminated soil by stimulating mineral-ameliorant of the indigenous microflora allows to some extent to offset the spatial heterogeneity of the distribution of pollutants, as the intensity nesimmetrichnoi nitrogen fixation is in direct relation to the increase in the ratio of carbon and nitrogen, i.e. the amount of oil in a given area of soil.

Characteristic mineral-improver: total porosity 70-75%; sorption capacity in relation to oil 1.5-2.0 g of oil per 1 g of the mineral; adhesiveness with respect to the microflora 5-10·10 cells / cm2.

The content of biogenic macro - and micronutrients, %:

calcium-1,00-1,10;

magnesium - 0,60-0,65;

potassium - 0,75-0,80;

sodium - 0,25-0,30;

zinc - 0,0035-0,0040;

copper - 0,0026-0,0030;

Bor - 0,0025-0,0030;

manganese - 0,0075-0,0085;

molybdenum - 0,0010 is 0.0015;

cobalt - 0,0010 is 0.0015;

Nickel - 0,0035-0,0040.

Example 1.

The original oil content on the site contaminated soil area 1·104 m2was 75-90 g per 1 kg of soil that sootwetstwuet%level of contamination (of the volume of soil). For purification from oil products in the soil were made: 2 tons of mineral-improver; 500 kg of NPK and 500 kg of nitrogen fertilizer. For uniform distribution of the introduced components and improve soil aeration spent tilling the soil to a depth of at least 25-30 see

Immediately after soil mineral-improver at the same time provided the sorption of petroleum hydrocarbons and 5-6-fold increase in the number of hydrocarbon-oxidizing microorganisms. Level nesimmetrichnoi nitrogen fixation increased by more than an order of magnitude and was 7-8 mg N/g soil. While the actual activity of Azotobacter was 95-98% of the potential for this soil. High counts of microorganisms and the activity of nitrogen fixation were observed during the entire observation period, i.e. for 30 days, after which the oil content decreased up to 18-20 g/kg of soil. This corresponds to 85-88%soil purification.

Example 2.

The original oil content on the site contaminated soil area 1·104 m2was 150 g per 1 kg of soil, which corresponds to the 25%level of contamination (of the volume of soil). For purification from oil products in the soil were made: 2.5 tons of mineral-improver; 300 kg of ammonium nitrate, 1 t of superphosphate and 300 kg of nitrogen fertilizer. For uniform distribution of the introduced components and improve aeration on what you were loosening to a depth of at least 25-30 see Immediately after soil mineral-improver at the same time provided the sorption of petroleum hydrocarbons and the increase in the number of hydrocarbon-oxidizing microorganisms to levels 5-6·10 cells in 1 g of soil and more than 10-fold increase in nitrogen-fixing activity.

High counts of microorganisms were observed during the first month and decreased significantly by the end of the third month of observations by decreasing stocks of nutrients in the soil. High levels of nitrogen fixation was maintained during the entire observation period. At the 7 day observation was recorded 47-53%degree of purification of soil from oil. After 3 months from the beginning of the observations was achieved 65%degree of purification of the soil. The oil content in the soil did not exceed 55 g per 1 kg of soil.

Thus, the application of the proposed method in a short time (at low and medium degree of contamination - for one summer season; with a high degree over two seasons) to carry out detoxification and restoring key ecological functions of soil. Mineral-improver at the same time provides the sorption of petroleum hydrocarbons and stimulates the activity of hydrocarbon and nitrogen-fixing microorganisms, which leads to high speed destruction of oil. A method of economically and environmentally sound and profitable because along with the savings in nitrogen fertilizer because of the small doses of mineral make-improver provides stimulating the activity of native hydrocarbon and nitrogen-fixing microflora rekultiviruemye soil.

Method of reclamation of soil contaminated by oil and oil products, including soil mineral nitrogen-phosphorus additives and natural highly porous mineral-improver with subsequent loosening, characterized in that as a mineral-improver use mineral from the group of silicates and loosening hold on depth not less than 25-30 see



 

Same patents:

FIELD: agriculture, microbiology.

SUBSTANCE: invention relates to a method for intensifying growth of microorganisms of genus Pseudomonas in growing cereal crops. Method involves presowing treatment of gramineous crops seeds with agent solution representing an aqueous solution of triple copolymer of acrylic acid, its amide and triacryloylhexahydro-1,3,5-triazine in the following ratio of components, wt.-%: active component, 0.0005-0.001; water, the balance. Method provides elevating number of microorganisms of genus Pseudomonas in rhizosphere and rhizoplane in rice and wheat roots.

EFFECT: improved intensifying method.

2 tbl

The invention relates to a method of growing fodder yeast Candida scottii in nutrient medium agar-glucose (1:1) and wort agar and can be used in the production of fodder yeast
The invention relates to biotechnology, can be used in food and medical industries
The invention relates to the microbiological industry, for production of alcohol, wine, beer, kvass, sewage treatment and other industries that use in technological processes of microorganisms

The invention relates to agriculture, in particular to soil science

The invention relates to biotechnology and can be used in the manufacture prebiotically products on milk basis

The invention relates to Mycology and plant physiology, namely endomycorrhizal fungi, forming mycorrhiza vesicular-arbuscular type plant

The invention relates to the field of biotechnology for the production of antibiotics by microbiological method

The invention relates to organic chemistry and biotechnology, namely the growth regulator of plants and microorganisms
The invention relates to methods of synthesis of biochemical compounds using enzymes or micro-organisms, in particular to the field of biochemical processes, and can be used in various fields of biotechnological synthesis

FIELD: environment protection.

SUBSTANCE: method involves mechanical removal of excessive contaminants from surface and reducing toxicity of contaminated soil; sowing green manure crops and perennial grasses; preliminarily removing taking soil samples from contaminated surface and separating native contaminant destructors therefrom; after mechanical removal of contaminant from soil surface, providing sequential treatment of plot soil with water-soluble humates and at least double treatment with native contaminant destructors; mellowing soil; applying lime with mineral fertilizers such as saltpeter, double superphosphate and calcium chloride. Green manure crops are sown after application of fertilizers. Method further involves grinding green manure crops, plowing into soil and covering with soil by means of covering roll.

EFFECT: increased efficiency, reliable ecologically clean restoration of soil after contamination thereof.

The invention relates to the field of environmental protection and biotechnology to improve the ecological condition of natural systems

The invention relates to the field of environmental protection and can be used for the restoration of contaminated land

The invention relates to the protection of the environment, in particular for the remediation of contaminated oil and petroleum products soil in the winter time

The invention relates to compositions intended for cleaning soil from oil pollution

The invention relates to the biological treatment of soil from the subsurface pollution with phenols

The invention relates to the field of oil production and refining industries

The invention relates to microbiological clearance and remediation of soils contaminated with oil and oil products

The invention relates to the field of environmental protection, in particular to the cleaning of soils, surface and bottom-hole zones of wells from oil spills and oil pollutions

The invention relates to biotechnology, in particular to the cleaning of the environment from pollution by oil and oil products

The invention relates to the production of uglechaninov and Tortuguero drugs, flocculants, coagulants, ameliorants, soil conditioners, fertilizers, and gumina-mineral substances with surface-active ion, chelating, complexing, and biologically active properties and can be used in environmental engineering
Up!