RU2336206C1 - Method of underground waters protection against contamination - Google Patents

Abstract

FIELD: technological processes.

SUBSTANCE: for method implementation assembled reservoir is used, made of separate sections. Sections are separated by antifiltering curtains. Closed drain device is used, arranged in the form of drain pipes that form annular drainage. Drain pipes are installed from internal side of antifiltering curtains circuits. Specified drain device is equipped with pipes with discharge to the surface, which are used for water supply to sections. Open drainage is arranged in the form of trenches. Trench is equipped with trays along polygon circuit. Level of underground waters inside polygon circuit is maintained below level of underground waters behind curtain circuit.

EFFECT: improvement of precipitation treatment.

2 dwg

Description

The invention relates to the field of ecology and is intended to reduce the degree of pollution of groundwater during infiltration of precipitation through the thickness of household, industrial and agricultural waste in places of their storage. The invention can be mainly used in housing and communal services, in various industries and in agriculture.

A known method of preventing pollution of groundwater and groundwater (RF patent No. 2141441, IPC B65G 5/00, publ. November 20, 1999) of soils and soils by industrial waste and products of accidental emissions and leaks. In this method, an anti-filter curtain in the form of an arc is created using jet technology in the upper part of an aquifer with a height equal to the height of the polluted stream. The concave arc faces the source of contamination. Pollution removal is performed through a well, a portion of which is sealed above an aquifer. The method allows to reduce the amount of contaminated water and improve the reliability of the protection of groundwater.

The disadvantage of the above method is the complexity of the equipment of the air curtain in the soil using inkjet technology.

Closest to the proposed method of protecting groundwater from pollution is a method of protecting mining and pits from groundwater inflows ("Guide to the drainage of rocks." Edited by IK Stanchenko. M .: Nedra, 1984. - P.184- 185, 278 p.) Using contour anti-filtration curtains in combination with open and closed drainage devices, collecting tank equipment and water drainage from the tank.

The disadvantage of this method is that it does not protect the groundwater from contamination by infiltrate and requires the removal of water from the collection tank to special treatment facilities.

The invention solves the problem of cleaning atmospheric precipitation contaminated during infiltration through the thickness of the waste at solid waste landfills.

To achieve the technical result in a known method of protecting groundwater from pollution, including the construction of a contour anti-filter curtain in combination with open and closed drainage devices, the equipment of a collection tank and the removal of water from the tank, it is proposed that the collection tank be made from separate sections separated by anti-filter curtains, closed the drainage device is made in the form of drainage pipes forming an annular drainage, the drainage pipes are arranged with an inner ones contours curtain, to supply them with the output pipes to the surface and be used for supplying water to the section. The open drainage device is proposed to be made in the form of ditches, to equip the ditch with trays along the contour of the landfill, and maintain the groundwater level inside the landfill circuit below the groundwater level beyond the curtain circuit.

The method is illustrated by drawings,

where in Fig.1 shows a vertical section of the soil at the base of the landfill and ponds in the direction of the slope of the relief; figure 2 is a plan of the landfill and ponds.

In the drawings, the following notation:

1 - contour trench anti-filter curtain;

2 - suction pipe for a mobile pump;

3 - sections of the collection tank;

4 - discharge pipe for a mobile pump;

5 - solid waste landfill;

6 - precipitation;

7 - observation wells (piezometers);

8 - a drainage ditch equipped with trays;

9 - aquifer soil;

10 - drainage pipes;

11 - water intake well or well;

12 - waterproof layer of soil;

13 - water-absorbing ditch;

14 - dividing antifiltration curtains;

Δ1 - groundwater level;

Δ2 is the water level in the sections of the storage tank.

The method is implemented as follows. On a solid waste landfill 5 not equipped with a waterproof screen, a trench anti-filter curtain 1 is constructed along its circuit. Inside the curtain 1, a prefabricated tank is made up of separate sections 3, which are separated from each other and from the side of the landfill by separation anti-filter curtains 14. Sections 3 are cascaded on the side polygon located below the terrain.

When equipping trenches for curtains 1 and 14, drainage pipes 10 of annular drainage are laid on the inside of each closed loop, which are connected to the suction pipe 2 and discharge pipes 4 and bring them to the surface. Impervious curtains are created by placing material with low filtration properties (clay, etc.) in trenches. Behind the contour of the curtain 1 at the last section 3 equip a water-absorbing well 11 or well. Curtains 1 and 14 and the well 11 are embedded with soil into the water-resistant layer 12.

From the outside of the curtain 1 along the landfill 5, a drainage ditch 8 is opened, which is equipped with trays, and along the sections 3 of the collection tank, a water-absorbing ditch 13 (without trays). At the site of the landfill with the maximum level of groundwater (before the curtains are erected), two observation wells are equipped, placing them on the outer and inner sides of the curtain 1.

Groundwater protection against pollution at the landfill equipped with the above method is carried out as follows. Precipitation 6, contaminated during infiltration through the waste of landfill 5, gets inside circuit 1, from where, filtered through the aquifer of soil 9, they penetrate into the drainage pipes 10 of the annular drainage and are pumped through the suction pipe 2 (mobile, not shown in the diagrams) to discharge pipe 4 and further into the drain pipe 10 of the first section 3 of the collection tank from the landfill. After passing the first stage of biological treatment, water from the first section 3 is supplied in a similar way to the second section, etc. After reducing the concentration of harmful substances in water to the maximum permissible norms, water is discharged into a water-absorbing well 11 or a well, from where it enters the aquifer of the soil. Purification of the infiltrate contaminated at the landfill is carried out by repeatedly filtering water through the thickness of the aquifer and biological treatment in the sections of the collection tank by plants (for example, reeds, etc.), which ensures the protection of groundwater from pollution. Maintaining the groundwater level inside the landfill circuit below the boundary water level eliminates the flow of contaminated water through the air curtain 1, moreover, the water levels are monitored in wells 7. Surface water through a ditch 8 equipped with trays is discharged into ditches 13, from where they enter the ground and increase groundwater level on the outside of the curtain 1 sections 2 of the collection tank, which also prevents the filtration of contaminated water from sections 3 of the collection tank.

Namely, the implementation of the collection tank from separate sections separated by anti-filter curtains, the implementation of a closed drainage device in the form of drainage pipes forming an annular drainage, the location of the drainage pipes on the inside of the contours of the anti-filter curtains and the supply of pipes to the surface, the use of the drainage device of the tank for water supply in the section, performing open drainage in the form of ditches, ditch equipment along the contour of the landfill with trays, as well as maintaining the level of soil water inside the polygon contour below the groundwater table for the circuit curtain provides a solution to this problem and excludes groundwater contamination on solid waste landfills.

Claims (1)

A method of protecting groundwater from pollution during atmospheric precipitation infiltration at solid waste landfills, including the construction of a contour anti-filtration curtain in combination with open and closed drainage devices, the equipment of a collection tank and drainage of water from the tank, characterized in that the collection tank is made of separate sections, divided impervious curtains, a closed drainage device is made in the form of drainage pipes forming an annular drainage, and I have drainage pipes on the inner side of the circuits of the anti-filtration curtains, they are equipped with pipes leading to the surface and used to supply water to the sections, and the open drainage device is made in the form of ditches, the ditch is equipped with trays along the contour of the landfill, and the groundwater level inside the landfill circuit is maintained below the groundwater level for the contour of the curtain.

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