KR101195401B1 - A Soil Vapor Extraction Remediation System And Method Using Prefabricated Vertical Drains - Google Patents

Abstract

The present invention relates to a system and method for restoring soil vapor extraction using a vertical drainage, more specifically, to allow the inflow and discharge of air and pollutants in all parts of the ground in contact with the vertical drainage. It is possible to install the vertical drainage in consideration of various functions such as pollutants and ground conditions, and the soil steam extraction restoration system using the vertical drainage, which can change the vertical drainage into extraction drainage and injection drainage before and after construction. It is about a method.

Vertical drainage, soil vapor extraction, dumping water, restoration, fine ground

Description

Soil Vapor Extraction Remediation System And Method Using Prefabricated Vertical Drains}

The present invention relates to a system and method for restoring soil vapor extraction using a vertical drainage. More specifically, it is possible to introduce and discharge air and pollutants in all parts of the ground in contact with the vertical drainage. It is possible to install vertical drainage in consideration of various functions such as pollutants and ground conditions, and to restore the soil steam extraction system and method using the vertical drainage that can change the vertical drainage to extraction drainage and injection drainage before and after construction. It is about.

 In recent years, the importance of the soil environment, which is affected by development projects due to heightened soil and groundwater pollution due to waste and toxic chemicals generated by population growth and industrial development, is emerging. Especially, as the economic development and the income level have improved, the oil usage due to the supply of automobiles has greatly increased along with industrial activities. Accordingly, the problem of soil and groundwater contamination due to the outflow of oil and harmful chemicals classified as non-aqueous liquids (NAPLs) in oil storage tanks of gas stations and underground storage tanks of industrial facilities storing chemicals has been highlighted.

Contaminated soil restoration techniques have been proposed in various ways. Soil cleaning, soil vapor extraction, pumping, and bio venting are widely used as on-site restoration techniques in contaminated areas.

Dual soil vapor extraction method (system) is shown as shown in FIG. Soil contaminated with oil is divided into soluble pollutant (G2) dissolved in groundwater based on groundwater level (9) and polluted soil (G1) remaining above groundwater level. This is to remove volatile organic contaminants in soil. The vacuum blower (3) is operated to cause the steam flow (8), which is discharged through the extraction well (7). At this time, the air pressure is measured in the pressure gauge 1 and the air volume is checked through the flow meters 5 and 6. Then, the mixed air other than the steam is discharged through the air discharge line (2), and the remaining volatile vapor is sent to the steam treatment device (4).

However, the soil vapor extraction method is to be used to induce the steam flow in the soil, mainly used in the assembly and unsaturated ground, landfill, low permeability landfill containing high concentration of heavy metals and harmful substances densely concentrated in urban areas, industrial areas, factory areas In the ground, there is difficulty in extracting vapor flow and pollutants.

In addition, as shown in Figure 1, the extraction well (7) is to be inserted into the entire soil, the construction is not easy, and as time passes, the concentration changes of pollutants in the soil (soil) occurs and such concentration The extraction well 7 at the position where the pollutant has already been treated in the contaminated ground due to the change has to be shut down one by one, which is an uneconomical problem.

The present invention can be used even in a low permeability unsaturated ground, and the object is to provide a soil vapor extraction restoration system and method using a vertical drainage material that can be easily installed, stop the operation and change the operation after construction. .

Soil steam extraction restoration system using the vertical drainage material of the present invention as a means for achieving the above object is a plurality of vertical drainage material comprising a filter consisting of a core and a non-woven fabric surrounding the core is formed a plurality of types in the soil therein; Wow; An injection blower connected to the vertical drainage to inject air into the vertical drainage; The vacuum drainer is connected to the vertical drainage and comprises a vacuum blower for sucking contaminants from the vertical drainage.

In the present invention, the core may be presented in various shapes, may be formed in a wavy shape, the groove may be formed in the direction in which the flow groove is typed on both sides, and the embossing may be formed.

In particular, when the embossing is formed on the core is preferably configured to be embossed on both sides of the core.

On the other hand, it is reasonable that a lining layer surrounding the vertical drainage is further configured at a portion of the vertical drainage contacting the ground surface.

In addition, the blower is connected to a plurality of vertical drainage, the vacuum blower is connected via a plurality of vertical drainage and a vacuum line, respectively, the injection blower is characterized in that it is connected through a plurality of vertical drainage and injection line, respectively. .

In addition, it is reasonable that each of the vacuum line and the injection line is configured with a locking valve to open and close the vacuum line and the injection line.

In addition, each lock valve may be electrically connected to the control unit so that the opening and closing of the vacuum line and the injection line may be controlled through the control unit.

On the other hand, the surface of the plurality of vertical drainage type is configured by the membrane can prevent the inflow of air through the surface.

Meanwhile, the method of restoring soil vapor extraction using the vertical drainage of the present invention includes the steps of: type the vertical drainage in the ground; Connecting a vacuum blower and an injection blower to the vertical drainage; Injecting air into the vertical drainage through an injection blower; Characterized in that it comprises a step of extracting contaminants in the ground from the vertical drainage through a vacuum blower.

Soil steam extraction restoration system and method using the vertical drainage of the present invention has the advantage that can restore the polluted soil even in the region (soil) low water discharged by the air discharged from all the soil contacted with the vertical drainage and contaminants introduced. .

In addition, the present invention and soil steam extraction restoration system and method using the vertical drainage has the advantage that can be applied even if the ground conditions, such as groundwater level, compaction, by presenting the structure of the various vertical drainage.

In addition, the present invention, the soil steam extraction restoration system and method using the vertical drainage is economical because it can be used to selectively convert / drain the vertical drainage to the extraction drainage and injection drainage even after construction, it is economical and can cope with changes in pollution afterwards There is this.

Hereinafter, the structure and operation of the present invention will be described in more detail with reference to the accompanying drawings. In describing the present invention, the term or word used in the present specification and claims is based on the principle that the inventor can appropriately define the concept of the term in order to best describe the invention of his or her own. It should be interpreted as meanings and concepts corresponding to the technical idea of

Figure 2 is a side cross-sectional view showing the operating relationship of the soil steam extraction restoration system using the vertical drainage material of the present invention, Figures 3a to 3c is an embodiment of the vertical drainage as a configuration of the soil steam extraction recovery system using the vertical drainage material of the present invention. 4 is a side cross-sectional view showing a case in which a lining layer is formed in the vertical drainage, which is one configuration of the present invention, and FIG. 5 is a configuration diagram of a soil vapor extraction restoration system using the vertical drainage of the present invention, and FIG. A block diagram showing a method for restoring soil vapor extraction using the inventor's vertical drainage.

The present invention is a soil steam extraction restoration system using a vertical drainage as shown in Figure 2 is a plurality of vertical drainage 100 and the injection blower 200 for injecting air to some of the vertical drainage (100) The vacuum drainer 300 is configured to extract contaminants from some of the vertical drainage 100.

First of all, the vertical drainage 100 is a type that is typed in the ground 10. The detailed configuration is composed of a core 110 and a filter 120 surrounding the core. The filter 120 is made of a non-woven fabric to cover the core 110 to correspond to the configuration to discharge the air to the ground (10) or to introduce contaminants from the soil.

The vertical drainage 100 is the core 110 and the filter 120 surrounding the core can be configured to be fixed (fixed) and free (free), the fixed type is attached to the core and the filter is separated The two parts are separated.

The core 110 is not limited to the material, but should be sufficiently resistant to earth pressure, sufficient water supply capacity to ensure the inflow and outflow of air and pollutants to the top, bottom smoothly, elastic material As it is preferable to use as, for example, polypropylene (polypropylene) and polyethylene (polyethylene) may be used.

In the case of the filter 120, the material is not limited, but polyethylene, which has a structure that prevents soil particles from entering the core 110 from the ground, and allows air and contaminants to pass through the filter 120. It is reasonable to use nonwoven fabrics composed of polypropylene, polyester and the like.

As the material of the filter 120, a nonwoven fabric is a known material, and in order to prevent clogging, it is preferable to adjust the particle diameter of the nonwoven fabric according to the particle size distribution of the soil. Here, the occlusion phenomenon refers to a phenomenon in which soil particles move away from the soil matrix by the flow of fluid in the gap of the nonwoven fabric and then fill up the gap of the nonwoven fabric, thereby decreasing the water permeability of the nonwoven fabric and inflowing air into the ground. And it is reasonable to prevent the inflow of pollutants, and when the transverse pressure such as hydraulic pressure is generated due to the blockage phenomenon, the durability of the vertical drainage material (100), etc. is lowered. It is reasonable to adjust and use.

The core 110 forms a bend on the surface, and various embodiments are presented as shown in FIGS. 3A to 3C according to the shape of the bend.

First, the core 110a shown in FIG. 3A is formed with wavy curves on its surface, and the convex and concave shapes of the convex 111a and the concave 112a are alternately formed on the surface of the core 110a. do. That is, the air and the pollutants are moved by the flow path 113a formed by the convex 111a and the concave 112a in the direction in which the vertical drainage 100 is inserted into the ground. In the case of the core 110a, the buckling strength is reinforced by the uneven shape formed in the longitudinal direction, thereby preventing the vertical drainage material 100 from buckling by the lateral pressure. In addition, there is an advantage that to strengthen the durability against the lateral load applied to the filter 120 based on the elasticity of the irregularities.

Next, the core 110b shown in FIG. 3B is formed in both directions (length directions) in which the flow grooves 111b are typed in the ground. That is, a plurality of flow grooves 111b are formed on both surfaces of the core 110b in parallel in the longitudinal direction, such that air and contaminants move upward and downward on the flow grooves 111b. In the case of the core (110b) can be reinforced durability of the load.

Next, the core 110c shown in FIG. 3C is embossed. A plurality of embossing may be formed on one surface of the core 110c, but embossings 111c and 112c may be formed on both surfaces so that air and contaminants may move easily in the left and right directions as well as in the up and down directions. It is. That is, the air and pollutants are easily moved in the left and right directions because the air and pollutants are induced only in the up and down directions in the embodiments shown in FIGS. 3A and 3B. Excessive amount is leaked and introduced into the vertical drainage 100 will be able to prevent the occurrence of defects in the filter 120. In addition, it is possible to relieve the lateral load acting as the filter 120 by the elasticity of the embossing.

Meanwhile, as illustrated in FIG. 4, the vertical drainage 100 may further include a lining layer 130 surrounding the vertical drainage 100 at a portion of the vertical drainage 100 that is in contact with the ground surface. The lining layer 130 to prevent the inflow, outflow of air, etc. to the filter 120 from the top of the vertical drainage 100, which is based on the operation of the vacuum blower 300 to be described below the vertical drainage 100 This is to prevent the vacuum loss in the air and to prevent the inflow of air into the ground (10) from the outside. The lining layer 130 may prevent the inflow of air or the like into the filter 120 by a plastic material, which is a known material.

The injection blower 200 is connected to the vertical drainage 100 and corresponds to a configuration for injecting air into the vertical drainage 200. The injection blower 200 may use a known configuration. Air is injected into the vertical drainage 100 connected to the injection blower 200 based on the operation of the injection blower 200 to move the air through the core 110 and from the front of the filter 120 through the filter 120. To get air into the ground. Inflow of air into the underground 10 causes the flow of steam (gas) in the ground 10 by evaporating oils and harmful chemicals classified as non-aqueous liquids (NAPLs) in underground storage tanks. The flow of vaporized vapor, such as oil and harmful chemicals in the ground to the outside by the action of the vacuum blower 300 to be described below to be able to process.

The vacuum blower 300 is connected to the vertical drainage 100 to externally contaminants in the soil 10, e.g., vaporized vapor and liquid pollutants such as oil and harmful chemicals through the vertical drainage 200. Corresponding to the configuration that flows out into the vacuum blower 300 may also use a known configuration. Based on the operation of the vacuum blower 300, the interior of the vertical drainer 100 connected to the vacuum blower 300 is in a vacuum state, and contaminants are introduced into the vertical drainer 100 from the ground. The core 110 will flow out while moving upward. That is, contaminants are introduced into all surfaces of the filter 120 into the vertical drainage 100 so that the contaminants may flow out while moving on the core 110.

Since the injection blower 200 and the vacuum blower 300 are connected to the plurality of vertical drainers 100, the vertical drainage 100 is inserted and injected by investigating the distribution of pollutants, concentration, etc. in the ground 10 in advance. Connect the injection blower 200 to the vertical drainage 100 corresponding to the drainage 100-2, and connect the vacuum blower 300 to the vertical drainage 100 corresponding to the extraction drainage 100-1. However, the pre-investigation is obtained by collecting only a portion of the sample in the ground (10), and it is not possible to accurately recognize the distribution of pollutants in the ground, etc. 2) and in order to be able to selectively change the extraction drainage 100-1 in Figure 5 the vacuum blower 300 is connected through a plurality of vertical drainage 100 and a vacuum line 310, respectively, the injection blower 200 each of a plurality Presents an example is configured to be connected through a granulated jikbae 100 and infusion line 210.

In addition, in FIG. 5, the locking valves 311 and 211 are further configured in each of the vacuum line 310 and the injection line 210 to open and close the selected vacuum line 310 and the injection line 210. The drainage material 100 may be configured to be selectively connected to the vacuum blower 300 and the injection blower 200. The lock valves 311 and 211 may be configured to be opened and closed by the manual operation of the selected vacuum line 310 and the injection line 210 by manually operating the control valves 400 to the respective lock valves 311 and 211. By electrically connecting the control unit 400 may be configured to automatically adjust the opening and closing of the vacuum line 310 and the injection line 210.

In FIG. 5, the five vertical drainers 100 are typed into the ground 10 to turn on the vacuum line 310 connected to the vertical drainers 100 located in the center on the basis of the manipulation of the control unit 400, and the remaining vertical drainers are turned on. The vacuum drain 310 connected to the 100 is turned off so that the vertical drainage 100 positioned in the center functions as the extraction drainage 100-1 so that the contaminant c is external through the center vertical drainage 100. To be extracted as, on the injection line 210 connected to the remaining vertical drainage 100 except for the vertical drainage 100 is located in the center on the injection line 210 connected to the center vertical drainage 100 An example in which air (a) is injected into the ground (10) by turning off the vertical drainage (100) to function as the injection drainage (100-2) except for the vertical drainage (100) positioned in the center. In other words, the contaminants in the ground are discharged to the outside through the vertical drainage (100) to induce the flow of air to the ground (10) through the remaining vertical drainage (100).

On the other hand, as shown in Figure 2 it is reasonable that the membrane-shaped membrane 500 is configured on the upper surface, that is, the surface of the ground in which the plurality of vertical drainage 100 is typed. The membrane 500 is to form a water impermeable layer using a known plastic material, such as to prevent the vacuum loss based on the configuration of the membrane 500, and to prevent the inflow of air from the outside into the ground (10) It will be possible.

Meanwhile, the method for restoring the soil vapor extraction using the vertical drainage of the present invention has a step of typing the vertical drainage in the ground as shown in FIG. 6. In this step, the vertical drainage 100 is typed using the mandrel of the hydraulic equipment in the ground 10, that is, the soil. The vertical drainage type 100 is a type considering the ground conditions such as groundwater level, engineering characteristics of the soil as well as construction conditions. In addition, it is appropriate to prevent the occurrence of a vacuum loss by the operation of the vacuum blower 300 by installing the membrane 500 on the ground surface when the vertical drainage 100 type.

Then it has a step of connecting the vacuum blower 300 and the injection blower 200 to the vertical drainage (100). In this step, the vacuum blower 300 may be connected to the selected vertical drainage 100, and the injection blower 200 may be connected to the selected vertical drainage 100, but the vertical drainage 100 may be selectively selected as mentioned above. The vertical drainage 100 is connected to the vacuum line 310 and the injection line 210 so as to be used as the extraction drainage 100-1 and the injection drainage 100-2, respectively, and lock valves 311 and 211 are respectively provided. It can be installed to control the opening and closing of the locking valve (311, 211) by the control unit 400.

Then it has a step of injecting air into the vertical drainage 100 through the injection blower (200). That is to operate the injection blower 200 to inject air into the vertical drainage 100 connected to the injection blower 200 to form a flow of air in the ground (10). Then, the step of extracting the contaminants in the ground (10) from the vertical drainage 100 through the vacuum blower (300). That is, by operating the vacuum blower 300 is to discharge the pollutants to the outside through the vertical drainage 100 connected to the vacuum blower (300). The contaminants leaked to the outside are not shown in the drawings, but water and air are separated through an oil / water separator, and vaporized vapors such as air, oils, and harmful chemicals are known as purification structures such as activated carbon. To purify by.

Injecting air into the vertical drainage 100 through the injection blower 200 and extracting contaminants in the ground from the vertical drainage 100 through the vacuum blower 300 may proceed simultaneously. .

1 is a schematic diagram showing a prior art,

Figure 2 is a side cross-sectional view showing the operating relationship of the soil steam extraction restoration system using the present inventors vertical drainage,

3A to 3C are perspective views showing an embodiment of the vertical drainage as one configuration of the soil vapor extraction restoration system using the vertical drainage of the present invention;

Figure 4 is a side cross-sectional view showing a case where a lining layer is formed in the vertical drainage, which is one configuration of the present invention,

5 is a schematic diagram of a soil vapor extraction restoration system using the present inventors vertical drainage,

6 is a block diagram showing a method for restoring soil vapor extraction using the vertical drainage material of the present invention.

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

100: vertical drainage 110: core

120: filter 200: injection blower

300: vacuum blower 400: control unit

Claims (11)

A plurality of vertical drainers inserted into the contaminated ground, a filter formed of a core and a nonwoven fabric surrounding the core, an injection blower connected to the vertical drainage and injecting air into the vertical drainage, and the vertical drainage connected to the vertical drainage In the soil vapor extraction restoration system composed of a vacuum blower that sucks soil pollutants from the drainage, The core has a plurality of embossing is formed on the surface of both sides to move the air and contaminants in the up, down and left and right directions to prevent the lateral load acting as a filter and to prevent the clogging of the nonwoven fabric, The vacuum blower is connected through a vacuum line configured with a respective vertical drainage and a lock valve, and the injection blower is connected through an injection line configured with a respective vertical drainage and a lock valve, wherein each lock valve is electrically connected to a controller. , Each vertical drainage is selectively connected to the vacuum blower or the injection blower according to the control signal of the control unit, and is selectively selected as an extraction drainage for injecting air into the ground, or an extraction drainage for discharging pollutants to the outside. Soil vapor extraction restoration system using a vertical drainage, characterized in that configured to be converted. delete delete delete delete delete delete delete delete delete delete

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