Device for cleaning soil from organic contaminants

 

(57) Abstract:

The invention relates to means for cleaning soils from organic contaminants. The device includes electrodes placed in wells made in the treatment zone, a source of direct current connected to the electrodes, and is equipped with a distribution system capacity with a cleaning liquid; a cleaning zone entered injector, designed in the form of a perforated pipe, communicating in the upper part of the distribution system capacity; has a compressor which is connected with the injector and wells electrodes; a source of direct electric current and the electrodes of the switch included in the current direction. The device eliminates the need to separate contaminants from the cleaning liquid by their decomposition in the treatment zone under the ground. 1 C.p. f-crystals, 1 Il.

The invention relates to electroosmotic technique and is intended for cleaning soils contaminated with organic substances (oil, oil products, phenols, benzene, toluene, and others).

A device for cleaning soils from organic contaminants, including electrodes - an anode and a cathode connected to the source of quartering the STV can be used only for cleaning of ground, remote by excavation from pollution.

A device for cleaning the capillary-porous medium containing the electrodes - the anode and the cathode, is placed in the cleaning zone in wells which are connected to the constant current source, a container of cleaning fluid and connected with it by a distribution system, and a collector for collecting the contaminated liquid from the centrifuge; see the application for the grant of a patent of Russian Federation N 96115093/02 (021565) from 17.07.1996, CL C 25 C 1/22, the decision to grant a patent from 05.01.1997,

This device can be used for cleaning soils without excavation (in situ). This solution is taken as the prototype of the present invention.

Its disadvantage is the complexity of the design due to the presence of elements for collecting the contaminated liquid and the separation from her dirt to allow re-use of this fluid. In addition, there is the issue of transportation, disposal or elimination of contaminants.

The basis of the present invention it is the task of simplifying the device specified by eliminating the necessity to separate contaminants from the cleaning liquid by their decomposition in the treatment zone under the earth.

The applicant has not identified any sources of information containing data on technical solutions, the symptoms of which are identical with all the essential features of the invention. This allows to make a conclusion on the compliance of the claimed technical solution the criterion of "novelty".

Due to the implementation characteristics of the invention (in conjunction with the features indicated in the restrictive part of the formula of the invention) gives the following important new properties of the fluid, containing these impurities, separation, transportation, disposal or liquidation; the device is greatly simplified by eliminating the need to use a collector to collect contaminated water and centrifuge for separating contaminants from the cleaning fluid.

The applicant has not identified any sources of information containing data on the influence of signs specified as a difference of the present invention, for achieving the above technical result. This determines, according to the applicant, the proposed technical solutions to the criterion of "inventive step".

The invention is illustrated in the drawing. The device includes electrodes 1 and 2, placed respectively in wells 3 and 4, is made in the soil in the treatment zone. Depending on the size and shape of the spots of dirt can be used multiple electrodes and respectively wells and they can be arranged in rows or groups. In the upper part of the wells 3 and 4 posted by casing 5 and 6, the sealed relative to the walls of the wells 3 and 4 bentonitovykh tubes 7 and 8, respectively. The device includes a source 11 of a constant current, which through Perelli 9 and 10 for extracting electrodes after completion of the work.

In the treatment zone between the electrodes introduced injector 17, made in the form of a perforated, in the specific example, polyethylene pipes. In the upper part of the injector 17 is connected with the distribution system 18 of the tank 19 with a cleaning liquid. To disable the tank 19 from the distribution system 18 serves as the valve 20. The compressor 21 is communicated with a duct 22 with a cavity of the injector 17 and wells 3 and 4. In a specific example, the duct 22 is displayed in the distribution system 18, provided with valves. For overlapping duct 22 is a valve 25. Perforation 26 of the injector 17 is made on its site, the length of which corresponds to the thickness of the contaminated soil layer. The line going to the injector 17, provided with a valve 27.

In a specific example, the electrodes are made of ferrosilite, the length of each electrode is 1.2 m, diameter 60 mm, the total length of the electrode and coke backfill is 2.2 m Electrodes 1 and 2 are located at a distance of 1 m from one another. The constant current source consists of a power transformer and thyristor rectifier and provides the output voltage 90-250 Century as the cleaning liquid used in the solution of microorganisms type POUTICAL concentration receiving 1-2 MPa.

In a specific example, the soil is light loam) contaminated with diesel fuel at a concentration of 4 g/kg Depth of contamination from 2.5 to 4.5 m from the ground surface, the area of pollution - 16 m2. In the specific example used eight pieces of electrodes 1 and eight pieces of electrodes 2, and six injectors.

The device operates as follows. In the initial position, the valves 23, 24 and 25 are closed. Open the valves 20 and 27 and serves a cleaning liquid in the injector 17 is based 1-1,2 liters per cubic meter of treated soil. Cleaning liquid passes through the distribution system 18 in the injector 17 and through the perforation 24 hits the ground. In wells 3 and 4 add 5-8 liters of water. To the electrodes connected to the source 11 DC. First to the electrodes 1 connect the positive pole and the electrode 2, respectively, the negative pole. During the flow of electric current occurs electroosmotic process directed from electrode 1 to electrode 2. After a specified time (about five days) with a switch 12 polarity to the electrodes 1 connect the negative pole and the electrode 2 to the positive pole of the source 11 DC. This electroosmotic flow changes its is again changed. In a specific example, the process lasted 80 days. The current in the treatment zone ranged 6-20 As temperature increased from 14 to 40oC and was kept around this value.

The cleaning process was interrupted after lowering the oil concentrations to values of 70 mg/kg

In the cleaning process to improve its effectiveness in the treatment zone through the injector 17 periodically (3 times a day for 1 hour) was supplied from the air compressor 21. While the valves 25 and 27 are opened and the valves 20, 23 and 24 are closed. The contaminants entering the well, is connected to the negative pole and accumulated in the form of films on the surface of the water above the electrodes are removed by sparging through periodic purging of these wells air. The resulting hydrocarbon fumes are filtered out carbon filters (conventionally not shown) that prevents them from entering the atmosphere. When this one blows directly before switching the polarity of the source 11.

The proposed device is manufactured in the factory with conventional equipment and construction materials.

These circumstances cause, p is for cleaning soil from organic contaminants including electrodes placed in wells made in the treatment zone, a constant current source connected to the electrodes, and is equipped with a distribution system capacity with a cleaning liquid, characterized in that the cleaning zone is entered injector, designed in the form of a perforated pipe, communicating in the upper part of the distribution system capacity with a cleaning liquid, the device is equipped with a compressor communicating with the duct injector and wells electrode and between the source of direct electric current and the electrodes of the switch included in the current direction.

2. The device under item 1, characterized in that the perforation of the injector is made on its site, the length of which corresponds to the thickness of the contaminated soil layer.

 

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Soil conditioner // 2122903
The invention relates to environmental technologies and is intended for the remediation of contaminated soils and their use in severe chemical and physical pressure
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The invention relates to biotechnology and can be used for the biological treatment of oil pollution of soils, soil and water in areas tank farms, oil fields, industrial and other objects

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.

FIELD: soil restoration from formation fluid contaminants in oil recovery and transportation regions.

SUBSTANCE: claimed composition contains (mass %): chemical ameliorant 3.5-5.7; organic fertilizer 15.7-29.0; adsorbent 67.5-78.6. Method for sectioning soil treatment includes application of composition onto soil layer with 30 cm of depth. Then treated layer is shifted out of spot boundary. Opened surface is covered with composition of present invention. Then mole drainage of 60-65 cm in depth is made in soil by using mole plow or chisel plow, followed by plowing of 58-51 cm in depth and returning of sheared soil into spot.

EFFECT: effective soil restoration from formation fluid contaminants.

5 cl, 2 dwg, 1 tbl

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

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

FIELD: electrodes made of low electric conductivity material, electric connection with such electrode, use of such electrodes at treating liquids for removing contamination matters and for regenerating contaminated soil in situ.

SUBSTANCE: electrode includes elongated, mainly hollow body made of porous material characterized by comparatively low electric conductivity, connector in the form of elongated electrically conducting member connected to power source. Connector passes along inner cavity of electrode body and it has contact with surface of inner wall of body in large number of places mutually spaced along length of body for distributing electric current supplied from power source practically uniformly along electrode.

EFFECT: enhanced efficiency of electrolytic treatment of liquid contaminated with sewage waste, infection and radioactive matters at minimum voltage along electrode length.

12 cl, 3 dwg

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