Sorbent-ameliorant for cleaning oil-contaminated soil

FIELD: chemistry.

SUBSTANCE: three types of clay of different chemical composition is used with addition of molasses and Linex biopreparation in the following ratios, wt %: Dialbeculit clay -38-40; Irlit clay 1 - 28-32; Irlit clay 7 - 16-20; molasses - 8-12; Linex biopreparation -2-4. Adding such a composition to the soil reduces the amount of oil pollutants by 72%.

EFFECT: low toxicity of soil and expenses on amelioration.

1 tbl, 1 ex

 

The invention relates to the reclamation of soils and can be used for remediation of soils contaminated with oil.

Known improver consisting of clay and humus layer with the addition of coarse sand (patent No. 2253225 from 10.06.2005, IPC A 25/00, A01B 79/02).

Known improver is created at high cost, so as to accommodate sorbing substances perform sloping of the trench to a depth of 2-3 m

Known improver to reduce the pollution of the land of petroleum products by culture plants of phytoremediation that handle the strains of microorganisms (patent 2403102 from 10.11.2010, IPC VS 1/10).

However, to implement technical solutions require a significant amount of inoculum, which also increases costs.

Known composition for soil reclamation "Sorbex" on an organic basis with the addition of mineral components, the organic bases used sapropel, and as mineral components - zeolite and alumina in the following ratio of components, wt. %: sapropel 60-70, zeolite 23-27, alumina 8-11 (patent No. 2019107 from 27.11.1995, IPC SC 17/00).

Known composition mnogosotletney, and in the extraction of sapropel violation occurs landscape, disrupting the ecology of the area.

The closest composition to the present invention is a sorbent-improver, sustasis bentonite clay (36%), ash mixture (47%), blue clay (17%), (patent 2303623 27.07.2007, IPC SC 17/00).

A disadvantage of the known improver of the prototype lies in the high costs as to the place of pollution need to deliver ash mixture in large quantities and blue clay, located in remote locations.

The technical result is lower cost and toxicity of the soil.

The technical solution is that use ceritadewasa clay of local origin, containing a set of macro - and micronutrients with the addition of waste of sugar production molasses and biological Linex in the following ratio of components, %:

clay vallecula - 38-40;

clay Irlit 1 - 28-32;

clay Irlit 7 - 16-20;

molasses - 8-12;

biologic Linex - 2-4.

The advantage of the proposed sorbent is that zeolite-containing clay of local origin and are located in the tributaries of the Terek river, in the upper and lower parts having different chemical composition.

Clay vallecula consists of silicon (46,5%), iron (7,1%), potassium (1,1%), calcium (37%), cobalt (0,1%), zinc (1,1%), Nickel (1,7%), phosphorus (1.7 percent). The reaction medium alkaline (pH 9,1).

The Irlit 7, unlike valleculae contains: silicon 54%, aluminum - 16%, iron 4%, sulfur - 2,5%, potassium - 2%, essential elements (copper, cobalt, molybdenum, zinc, selenium) in the range of 0.1-0.9%. eacce medium acid (pH 3,8).

The Irlit 1 consists of silicon (54%), aluminum (28%), iron (7%), sulfur (2%), calcium (3%), magnesium (1.7 percent), manganese (1,7%), potassium (2,1%), sodium (1,1%), sulfur (2,0%), selenium (0,8%). The reaction medium is neutral. All clays have a high sorption properties due to the high content of silicon (46-54%), ability to absorb moisture and other substances.

The combination of clay with different pH equalize the effect of trace elements. Silicon contributes to the release of plant phosphorus due to displacement of its ions from difficultly soluble phosphates in the soil, while the silicic acid anions are able to block free carbonates in the soil solution, which reduces retrogradely soluble phosphates. Siliceous clay increase the mobility of phosphation in the soil. When the soil pollution with oil decreases the mobility of phosphorus, therefore making clays with a high content of silicon recovers phosphorus compounds, thereby reducing the amount of oil in the soil.

Clay vallecula differs from other known zeolite-containing substances lighter specific gravity (1.4 to 1.45 g/cm3), which makes the peculiarity of its mineralogical composition (the presence of a large number of hydrolog). Vallecula contains a noticeable amount of water-soluble salts, closer this index is to low mineralized sludge is sulfide mud, with high sorption properties.

Therefore, as part of the proposed mix these clays predominate (38-40%). Given the composition of other types of clays (Irlit 1 and Irlit 7), their reaction environment and the complex of microelements, supplementing the clay vallecula in the proposed proportions, justified dosage of each type.

Biologic Linex is a combination drug, which consists of 3 components of the natural microflora (Lactobacillus acidophilus, Bifidobacterium infantis, Enterococcus faecium), resistant to chemical agents.

This drug is usually used for alignment of the intestinal microflora of living organisms. Lactic acid bacteria that are part of Linex, support and regulate physiological process of the microorganisms in the soil.

Made molasses waste of sugar manufacture, contains 20-25% water, about 9% of the nitrogen compounds, mainly amides, 58-60% carbohydrates, mainly sugar and 7-10% ash. Used as carbohydrate food. In this object as a means of power for lactic acid bacteria preparation Linex.

The ability of clay to retain moisture, warmth provide favorable conditions for the development of microorganisms in the soil. Contained in clays sulphur and other isnonnegative elements provide the activity of anaerobic microorganisms type Linex.

The structure for land reclamation prepared to follow the way:

Clay vallecula (a tributary of the Terek - Urdon) in the amount of 3.8-4.0 t/ha was mixed with the Irlit 1 (2,8-3,2 t/ha), with the Irlit 7 (1.6 to 2.0 t/ha) - origin of Alagir district river Fiagdon. Molasses in the amount of 0.8-1.2 t/ha was mixed with biological Linex in the amount of 0.2-0.4 t/ha just before making.

Before soil application of crushed clay was placed in fertilizer planter mixed with molasses and Linex and brought directly into the soil to a depth of 10-15 cm

The results of the experiments after a single make that amount of sorbent (9-10 t/ha) showed significantly decreased the oil content in the soil. The results of the experiments are summarized in table (0-20 cm soil layer after 6 weeks after application).

Variants of experimentsHydrocarbons, kg/m2Concentration neftezagryazneny substances, g/kgReduction neftezagryazneny substances, %
Pollution with oil products (control)204865,0-
Clay vallecula142141,236,7
Clay Irlit 1/td> 175652,4to 19.9
Clay Irlit 7181456,813,6
A mixture of 3 clays91836,244,4
A mixture of 3 clay + molasses82628,556,2
A mixture of 3 clay + Linex58625,460,3
The proposed option (mix 3 clay, molasses + Linex)35018,272,0

Standard AFNOQ 90114 level of hydrocarbons should not exceed 500 mg/kg of soil. As follows from the table, the proposed option provides a reduction of hydrocarbons up to 350 mg/kg the number of neftezagryazneny substances is reduced by 72%.

Therefore, the introduction of various types of clays mixed with bacteria and molasses provides the reclamation of soils contaminated with oil.

Sorbent-improver for cleaning oil-polluted lands, consisting of Gleni the mentioned mixtures, characterized in that it contains
clay Vallecula content, wt.%: Si - 46,5, CA - 37, Fe - 7,1, 1,1, 0,1, Zn - 1,1, Ni - 1,7, P - 1.7 and pH of 9.1,
clay Irlit 1 content, wt.%: Si - 54, Al - 28, Fe - 7, S - 2, Sa - 3, Mg - 1,7, Mn - 1,7, K - 2,1, Se - 0,8, Na - 1,1-neutral pH and
clay Irlit 7 content, wt.%: Si - 54, Al - 16, Fe - 4, S - 2,5, K - 2, essential elements copper, cobalt, molybdenum, zinc, selenium is in the range of 0.1 to 0.9 with an acidic environment, pH 3.8,
waste of sugar manufacture of molasses and
biologic Linex in the following ratio, wt.%:

clay Vallecula38-40
clay Irlit 128-32
clay Irlit 716-20
molasses8-12
biologic Linex2-4



 

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1 cl, 2 tbl

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4 tbl

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51 cl, 15 dwg, 3 tbl, 11 ex

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9 tbl

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1 ex

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