KR100832489B1 - Fluid Extraction Well Made with Porous Media of Multiple Porosity for Remediation of Contaminated Underground - Google Patents

Abstract

The present invention relates to the design of a fluid extraction well that can be used in the soil vapor extraction method, groundwater pumping method and chemical injection method used as a method for smoothly restoring contaminated groundwater and soil, the porous porous medium having different pore sizes Preparing, preparing a porous medium having a large void as an outer wall, and preparing a porous medium having a small void as an inner wall, installing a top wall, a bottom wall, and a fluid extraction tube to construct a fluid extraction well, And installing the extraction well in the contaminated soil area, and connecting the well pump through the fluid extraction pipe.

Soil contaminated, groundwater contaminated, porous media, fluid extraction wells

Description

Fluid Extraction Well Made with Porous Media of Multiple Porosity for Remediation of Contaminated Underground}

Soil pollution cases such as landfills, gas stations, military units, etc. are frequently reported, and a lot of technical efforts are put into smooth processing. Technical classification of oil pollution soil restoration method is divided into Ex Situ method that excavates and treats contaminated soil and In Situ method that treats in situ without excavation. Soil Vapor Extraction and Pump and Treat are typical methods for in situ methods, and the common embodiment of these two methods involves the use of pipe-type fluid extraction wells at various points within the contaminated site. By inserting forcibly contaminated groundwater or contaminated gas to reduce the concentration of pollution.

The conventional technology of such a fluid extraction well is a screen consisting of a plurality of slits in three directions of the pipe in the bottom of the suction well and inserting a pipe-type fluid extraction well by drilling the soil to a specific depth as specified in Republic of Korea Patent Registration 10-0462118 Figure 1 shows a screen of such a fluid extraction well. However, the contaminated soil and the contact area affecting the fluid suction efficiency are limited to the total area of the slit, so it is difficult to efficiently suck the fluid. In addition, since the size of the slit, which is the passage of the fluid, is constant, soil particles smaller than the size of the slit are introduced into the suction well, causing a failure of the pump installed on the ground, and the slit is often blocked by the soil particles. The efficiency of can be drastically reduced.

Another form of in-situ treatment involves the injection of agents that can oxidize soil contaminants into the ground through fluid injection wells. Conventional utility model 20-0308522, which is a prior art of a fluid injection well, is formed in a constant arrangement at the bottom and the circumferential portion of the injection well so that the liquid material is finely dispersed using high pressure in the ground, and is formed to spray the liquid material in a wide direction. However, these nozzles are very likely to break during insertion into the ground, and the nozzles are very likely to be clogged by small particles of soil.

The present invention is a component applied to the in situ contaminated soil purification device, more specifically, a fluid injection that can smoothly inject a fluid, such as groundwater and gas in the soil or drugs that can decompose contaminants into the soil. Related to the structure of the wall, it is characterized by using a multi-porous porous medium as a wall having a large contact area with the soil and can reduce the blockage.

The present invention is to solve the problems of the prior art that the screen consisting of a plurality of slits or the contact area between the contaminated soil and the fluid extraction well is blocked by soil particles, so that the suction efficiency is drastically reduced. This is to increase the efficiency of soil restoration. Thus, the configuration of the present invention will be described in detail.

In the wall of the fluid extraction tablet according to claim 1 of the present invention, a cylindrical porous medium 21 having a large pore is prepared, and a cylindrical porous medium 22 or 23 having a smaller size of pores therein is subsequently prepared. It consists of steps.

The material of such media does not react with contaminants of the fluid to be inhaled, and is selected to have a certain strength, and preferably a polypropylene porous medium may be used to achieve the object of the present invention.

The idea of the present invention can be achieved when the number of air gaps differs from two or more media layers, which will be described in more detail. The movement of material in the media with voids is largely a process of advection and diffusion. If the velocity of the fluid is high in the porous medium, the movement by advection is dominant, and when the velocity of the fluid is slow, the movement by diffusion is dominant.

Inhalation of fluids, such as groundwater or gas, through porous media can occlude pores in the porous media by fine soil or sediment. As shown in FIG. 3, the fluid extraction well having the porous medium having multiple pores as a wall serves to prevent the large particles of soil particles from entering the fluid extraction well while the porous medium having the large pores of the outer wall is formed. Due to the high speed of the process, when a portion of the porous medium of the small void of the inner wall is occluded, the fluid quickly flows to the unoccluded portion. The porous medium having small pores inside the fluid extraction well serves to prevent fine soil from entering the pump through the fluid extraction passage 24.

Since the contact area with the soil is much larger than that of the conventional wells, it is difficult for the fine soil to enter the wells as the fluid enters the injection and suction wells, and the void occlusion phenomenon, such as the prior art, may be significantly reduced.

The flow of fluid in the porous medium having multiple pores will be described in more detail using a porous medium having three layers of different pores as shown in FIG. 4. In the wall 21 composed of the porous medium having the largest void, both the velocity of the fluid 41 and the flow 42 in the vertical direction are large. In the porous medium 22 having medium voids, the velocity of the fluid flow is smaller (43 and 44), and in the inner wall (23) having the smallest void size, the velocity of the fluid flow (45 and 46). ) Becomes the smallest.

Therefore, the porous media constituting the wall of the suction well may have the effect of two or more layers having different voids, but preferably, the more porous the porous media, the smaller the voids. The present invention can be used to achieve the idea.

As described in claim 2, a cylindrical porous medium having multiple pores is blocked by the upper wall 25 and the lower wall 26 to constitute a fluid extraction well. When the fluid extraction pipe 27 is connected to the upper wall, the fluid entering the fluid extraction well 24 through the wall flows out through the fluid extraction pipe 27.

As described in claim 3, the fluid extraction well may be used to inject a medicament to restore the contaminated underground space.

5 shows an embodiment of the present invention. In order to recover the contaminated soil 56, a suitable point is drilled and the fluid extraction well of the present invention illustrated in FIG. 2 is inserted. The fluid extraction pipe 27 and the pump 58 are connected. At this time, to eliminate the space between the fluid extraction well and the contaminated soil bentonite sealing 57 is constructed.

The following drawings attached to this specification are illustrative of preferred embodiments of the present invention, and together with the detailed description of the invention to serve to further understand the technical spirit of the present invention, the present invention is a matter described in such drawings It should not be construed as limited to.

1 is a cross-sectional view showing a fluid extraction well equipped with a screen composed of several slits in the prior art.

2 is a cross-sectional view of a fluid extraction well having a porous medium having various pore sizes as a wall;

3 is a-a 'cross-sectional view of the fluid extraction well of FIG.

4 is a cross-sectional view showing the movement of contaminants in a porous medium of varying pore size.

5 is a field application example of a fluid extraction well having a multi-porous porous medium as a wall.

<Explanation of symbols for the main parts of the drawings>

DESCRIPTION OF REFERENCE NUMERALS 11 Prior Art Fluid Extraction Wall 12 Slit 21 Wall with Large Porous Cylindrical Porous Media 22 Wall with Medium Porous Cylindrical Porous Media 23 Wall with Small Pore Cylindrical Porous Media 24 Fluid Extraction Path 25: top wall 26: bottom wall 27: outer wall of cylindrical porous medium of fluid extraction pipe 41, 43, 45: speed of fluid movement in fluid extraction direction 42, 44, 46: fluid extraction direction and vertical fluid Movement speed 56: contaminated soil 57: bentonite sealing 58: pump 59: bedrock

Claims (1)

A fluid extraction well or injection well comprising the following fabrication steps used in the process of restoring a contaminated underground space. (a). Constructing a cylindrical wall in which the pore size is changed by using a porous medium having a large pore size as a material of the outer wall and a porous medium having a small pore size as a material of the inner wall. (b). Sealing the top and bottom of the cylindrical wall configured in step (a) with a lid, respectively. (c). Comprising the fluid extraction pipe on the upper lid configured in step (b) to configure a fluid extraction well or a fluid injection well.

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