The method of cleaning soil from hydrocarbons

 

(57) Abstract:

The method of cleaning soil from hydrocarbons relates to a method of cleaning soil from oil, gas condensate, oil, gasoline, etc. In the soil in the treated plot immerse the Central and peripheral electrodes, forming between them the voltage gradient in the area adjacent to the Central electrode, serves not polluting the carrier fluid, move under the influence of electroosmotic effect from the Central electrode to the peripheral, squeezed from the soil the carrier fluid hydrocarbons and remove them from the peripheral electrodes. As the carrier liquid use water with a pH equal to 9 obtained by the influence of cavitation, or pH 5.5, obtained by heating. You can use water extracted from the reservoir in the development of oil and gas fields. Effect: higher efficiency of cleaning soil by accelerating the movement of the carrier liquid and reduce the voltage stress on the electrodes. 1 C.p. f-crystals, 3 ill.

The invention relates to a method of cleaning soil from hydrocarbons (oil, gas condensate, oil, petrol etc).

A known method of cleaning sand from oil products (and.with.autoway acid concentration of 0.5 to 2.0 wt.% when the mass ratio of solid ground to liquid reagent 1: (2-6) for 30 minutes

The main disadvantage of this method is the processing of sand chemical reagent to neutralize you want to make additional reagents and to remove the products of reaction of these reagents, resulting in additional economic costs and improves environmental cleaned sandy soil.

The closest in technical essence of the present invention is a method of removing contaminated soil ( U.S. patent N 54157744 A MKI 6 : 01 D 61/56, published, ISM, vol.001, N 10, 1996, S. 34 - prototype), including immersion in the soil on a cleared area of the Central and peripheral electrodes, creating between them of the voltage gradient, the flow in the area adjacent to the Central, not polluting the carrier fluid, the movement of the carrier liquid under the influence of electroosmotic effect between the electrodes, the displacement of the carrier fluid contaminated material from the soil in the peripheral electrodes and removal of contaminated material from the last.

This method is more eco-friendly than similar. However, the movement of pure liquids-media type of water under the influence of electroosmotic EFI, as a viscous hydrocarbon oil type, engine oil and the like. Especially great resistance to the movement of the carrier liquid hydrocarbons occurs in the cold season, when the viscosity of the latter increases. Therefore, to ensure movement of the carrier liquid and viscous hydrocarbons is necessary to maintain a high voltage stress, of the order of 380 To 500 V, depending on the soil structure, resulting in large power consumption and makes this method ineffective.

The purpose of the invention is to improve the efficiency of cleaning the soil from hydrocarbons by accelerating the movement of the carrier liquid and reduce the voltage stress on the electrodes.

This objective is achieved in that in the method of cleaning soil from hydrocarbons, including immersion in the soil on a cleared area of the Central and peripheral electrodes, creating between the first and second gradient voltage supply in the region adjacent to the Central electrode, not polluting liquid carrier, moving the carrier liquid under the influence of electroosmotic effect from the Central electrode to the peripheral displacement of the soil the carrier fluid hydrocarbons and removing them from purnea cavitation, or up to 5.5 - heating.

Use as a carrier liquid is water, whose pH change to 9, influencing her cavitation, or up to 5.5 - heating, allowed to increase the cleaning efficiency of the soil at any temperature without the use of chemicals and neutralize them.

The applicant is not known cleaning methods soils, which would as a carrier fluid used water, whose pH change to 9, influencing her cavitation, or up to 5.5 - heating.

In Fig. 1 presents a graph of the pH of distilled water and fresh water depending on the time of action of cavitation.

In Fig. 2 presents a graph of the pH of the water from its temperature.

In Fig. 3 is a flow diagram of an installation for implementing the method of cleaning soil from hydrocarbons.

The proposed method of cleaning soil from hydrocarbons is carried out as follows.

As a result of cavitation of the water molecules dissociate into ions (H+and HE-. Ions H+partially leave the liquid phase and the ions of HE-accumulate in the latter, increasing the pH of the water. In Fig. 1 presents a graph of the pH of distilled water and fresh water, usetool surface activity and has a high detergent properties.

This water upon contact with hydrocarbons

- destroys the viscous surface film of hydrocarbons and intensive washes them out of the soil;

- improves the dynamics of the mixing discharge of hydrocarbons with itself and forms an emulsion, which has a small flow and low electrical resistance.

These properties increase under the influence of electroosmotic effect mobility in soil resulting liquid system (emulsion), which, ultimately, leads to the decrease of the voltage between the electrodes 60 and the cost of electricity and, as a consequence, to improve the efficiency of the method of cleaning soil from hydrocarbons.

When heated water to reduce its pH and therefore increases its conductivity. In Fig. 2 presents a graph of the pH of the water from its temperature. With decreasing pH of the water increases the solubility of hydrocarbons.

This water upon contact with hydrocarbons

- reduces surface tension and viscosity;

- forms a movable electrically conductive emulsion.

These properties enhance joint movement of water with hydrocarbons in soil under the influence of electroosmotic effect from cent and reduce energy consumption and increases the efficiency of the method of cleaning soil from hydrocarbons.

The proposed method of cleaning soil from hydrocarbons by its intensity is similar to methods of cleaning soils using chemical type surfactant with a pH of 9 and acid pH 5,5.

However, this method is environmentally friendly, does not require additional costs for chemicals and their neutralization.

Compared with the prototype of this method is more efficient than the prototype energy 6-7 times.

The method can be implemented using the setup depicted in Fig. 3. The installation consists of immersion in the soil in the treated area 1 Central 2 and 3 peripheral electrodes, nozzles 4 for the water feed pump 5, which serves to remove from the peripheral electrodes of water from hydrocarbon separator 6, which serves for the separation of water and hydrocarbons, tank 7 with a Venturi nozzle 8 and a heater 9, pump 10 to a water injection nozzle 4 and the nozzle of the Venturi 8. The separator 6 and the container 7 is connected by a pipeline on the water with a check valve 11. The tank 7 is additionally connected to the nozzle 4 high-pressure pipeline 12 water with a pH of 5.5.

An example of performing the method. Water with a temperature of 17oC with a pH of 7.4, served by the pump 10 from the container 7 in the Venturi nozzle 8 at a speed of 30 m/sec. Pressure is the water situation. Cavityretina the liquid flows back into the tank 7. Processing thus cavitation water is for 520 seconds, after which the water in the tank has a pH of 9. The obtained surface-active water pump 10 is fed through the nozzle 4 in the region adjacent to the Central electrode 2. Between the Central and peripheral electrodes to create a voltage gradient 60 C. Surface-active water with pH 9 under the action of the electroosmotic effect moves from the Central electrode 2 to the peripheral 3. While it is in contact with the hydrocarbons that contaminate the soil and destroys the surface film and intensive washes them out of the soil. Surface-active water with a pH of 9 with hydrocarbons emulsifies, which comes in the peripheral electrodes 3, whence it is removed by the pump 5 and fed into the separator 6. In the separator 6, the emulsion is separated into water, located at the bottom, and hydrocarbons, which are located at the top of the separator 6. The separated water enters the tank 7 through the check valve 11. The separated hydrocarbons are sent to storage tanks.

The described cycle is repeated until the complete removal of hydrocarbons from the soil. The process of cleaning the soil surface-active water obtained with soil temperature below 0oC from hydrocarbons in this way is water with a pH of 5.5, which is obtained by heating to 240oC in the vessel 7 through the heater 9. When heating water in the tank 7 blood pressure rises to 3.5 MPa. Under this pressure, water with a pH of 5.5 is served, bypassing the pump 10 on the pipe 12 through the nozzle 4 on the treated plot 1. Further the process of cleaning soils from hydrocarbons is similar to the process described above.

1. The method of cleaning soil from hydrocarbons, including immersion in the soil on a cleared area of the Central and peripheral electrodes, creating between the Central and peripheral electrodes of the voltage gradient, the flow in the region adjacent to the Central electrode, not polluting liquid carrier, moving the carrier liquid under the influence of electroosmotic effect from the Central electrode to the peripheral displacement of the soil the carrier fluid hydrocarbons and removing them from the peripheral electrodes, characterized in that as the carrier liquid use water with a pH value equal to 9 obtained by the influence of cavitation, or water with pH value, equal to 5.5, obtained as a result of its heat.

2. The method according to p. 1, wherein t

 

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