KR20100088940A - A soil washing system and method using pvds - Google Patents

Abstract

PURPOSE: A soil washing system using prefabricated vertical drains and a method using the same are provided to restore the contaminated soil even in an area where the degree of contamination is low by discharging the water out of the soil adjacent to the prefabricated vertical drains and inducing the contaminated material. CONSTITUTION: A soil washing system comprises a plurality of prefabricated vertical drains(100) including a filter, an insertion pump(200) connected to the prefabricated vertical drains and inserting the water into the prefabricated vertical drains, and a vacuum blower(300) connected to the prefabricated vertical drains and inhaling the contaminated material from the prefabricated vertical drains. The core is made in shape of wave. The core is embossed.

Description

Soil Washing System And Method Using PVDs

The present invention relates to a soil cleaning system and method using the vertical drainage, more specifically, it is possible to restore the soil in the ground having a low water permeability due to the inflow and discharge of water and pollutants in all parts in contact with the vertical drainage in the ground. It is possible to install vertical drainage in consideration of various functions such as soil, soil and ground condition, and it is related to soil cleaning system and method using vertical drainage that can change vertical drainage into extraction drainage and injection drainage before and after construction.

 Recently, the importance of the soil environment, which is affected by the development project, is increasing due to the severity of soil and groundwater pollution caused by wastes and harmful chemicals caused by population growth and industrial development around the world. In particular, with the continued economic development and the improvement of income level, the amount of oil used by automobile supply along with industrial activities increased greatly. 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.

The dual soil cleaning process (system) is shown as shown in FIG. Clean the contaminated soil by installing the injection wells (1) and the wells (2) in the ground near the source of contamination, and injecting water (cleaning liquid) through the injection wells (1), passing the contaminated soil, and recovering them through the wells (2). do. The soil cleaning method (system) is capable of rapid contaminant treatment rather than dilution and decomposition of contaminants in the natural state through cleaning through the injection well (1) and the positive well (2).

However, the soil cleaning method is to be used to induce the flow of water (cleaning liquid) in the soil, mainly used in granulated ground and saturated ground, which contains high concentrations of heavy metals and harmful substances densely packed in urban, industrial and factory areas. This low landfill has difficulty in extracting water (cleaning fluid) and contaminants.

In addition, since the injection well (1) and the well (2) must be inserted into the entire contaminated soil, construction is not easy, and as time passes, the concentration of pollutants in the contaminated soil (soil) occurs and the concentration change The pumping well (2) at the position where the pollutant has already been treated in the contaminated ground has to be stopped, so there is an uneconomic problem.

An object of the present invention is to provide a soil cleaning system and method using a vertical drainage material which can be used even in a ground having low permeability, and is easy to construct and that can stop unnecessary operations and change operations after construction.

Soil cleaning 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 plurality of types in the soil, the core and the non-woven fabric surrounding the core; An injection pump connected to the vertical drainage and injecting water 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 injection pump and the vacuum blower is connected to a plurality of vertical drainage, the vacuum blower is connected through a plurality of vertical drainage and a vacuum line, respectively, the injection pump through a plurality of vertical drainage and injection line, respectively It is characterized by being connected.

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.

On the other hand, the present invention is a soil cleaning method using the vertical drainage step of the type of vertical drainage in the ground; Connecting an injection pump and a vacuum blower to the vertical drainage; Injecting water into the vertical drainage through an injection pump; Characterized in that it comprises a step of extracting contaminants in the ground from the vertical drainage through a vacuum blower.

Soil cleaning system and method using the vertical drainage of the present invention has the advantage of restoring the contaminated soil even in the region (soil) low water discharged by the discharge of water from all the soil contacted with the vertical drainage and contaminants.

In addition, the present invention is a soil cleaning system and method using the vertical drainage has the advantage that can be applied even if the ground conditions, such as particle size distribution, compaction by presenting the structure of the various vertical drainage.

In addition, the soil cleaning system and method using the vertical drainage material of the present invention is economical because it can be used to selectively convert / drain the vertical drainage material to the extraction drainage and injection drainage even after construction, there is an advantage that can cope with changes in pollution after .

Hereinafter, the configuration 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 cleaning system using the vertical drainage material of the present invention, Figures 3a to 3c is a perspective view showing an embodiment of the vertical drainage in one configuration of the soil cleaning system using the vertical drainage material of the present invention, Figure 4 is a side cross-sectional view showing a case in which a lining layer is configured in the vertical drainage, which is one configuration of the present invention, Figure 5 is a schematic diagram of a soil cleaning system using the vertical drainage of the present invention, Figure 6 is a soil using the vertical drainage of the present invention It is a block diagram which shows the washing method.

The present invention is a soil cleaning system using a vertical drainage, as shown in Figure 2 is a plurality of vertical drainage (100), and the injection pump 200 for injecting water to some of the vertical drainage 100, and the It consists of a vacuum blower 300 for extracting 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 discharge water into the ground (10) or to contaminate 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 water 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, as a structure that can block the soil particles that can be introduced into the core 110 from the ground, and water and contaminants can pass through the filter 120 It is reasonable to use a nonwoven fabric composed of polypropylene, polyester or 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 the gap of the nonwoven fabric, thereby reducing the water permeability of the nonwoven fabric and inflowing water into the ground. And it is reasonable to prevent the inflow of pollutants, and when the transverse pressure such as hydraulic pressure occurs due to the blockage phenomenon, the durability of the vertical drainage material (100), etc. is lowered. It is reasonable to adjust by using.

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 water and the pollutants are moved by the flow path 113a formed by the convex 111a and the concave 112a in the direction (length 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 sides of the core 110b in parallel in the longitudinal direction, such that water and pollutants move upward and downward through 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 are formed on both surfaces so that water and contaminants can be easily moved in the left and right directions as well as in the up and down directions. It is. That is, the easy movement of the water and the pollutants in the left and right directions is that in the embodiments shown in FIGS. 3A and 3B, the water and the pollutants are moved only by the up and down one directions. 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 water, etc. to the filter 120 from the top of the vertical drainage 100 to the ground (10) based on the operation of the vacuum blower 300 to be described below This is to prevent vacuum loss through air inflow. The lining layer 130 should be impervious to water by a plastic material, such as a known material.

The injection pump 200 is connected to the vertical drainage 100 to correspond to the configuration for injecting water into the vertical drainage 200, the injection pump 200 may use a known configuration. Based on the operation of the injection pump 200, water is injected into the vertical drainage material 100 connected to the injection pump 200, and the water flows on the core 110, from the front of the filter 120 through the filter 120. The water is to be introduced into the ground (10). By the inflow of water into the underground (10), oil and harmful chemicals classified as non-aqueous liquids (NAPLs) in underground storage tanks are liquefied to induce the flow of pollutants. The flow of the vacuum blower 300 to be described below will be to the outside to be processed by the action.

The vacuum blower 300 is connected to the vertical drainage 100 to correspond to the configuration to discharge contaminants in the ground 10 through the vertical drainage 200 to the outside in the case of the vacuum blower 300 A known configuration may be used. 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 from the soil flow into the vertical drainer 100, and the introduced pollutants are 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 of the core 110 while flowing out.

When the injection pump 200 and the vacuum blower 300 are connected to the plurality of vertical drainers 100, the pollutant distribution, concentration, etc. in the ground 10 are investigated in advance to type and inject the vertical drainage 100. The injection pump 200 is connected to the vertical drainage 100 corresponding to the drainage 100-2, and the vacuum blower 300 is connected 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 the vacuum line 310, respectively, the injection pump 200 each of a plurality of vertical boat Presents an example is configured to be connected through the material 100 and the 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. Drainage 100 may be configured to be selectively connected to the vacuum blower 300 and the injection pump 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 water (w) is injected into the ground (10) by turning off the vertical drainage (100) except for the vertical drainage (100) positioned in the center to function as the injection drainage (100-2). That is, the contaminants in the ground are discharged to the outside through the vertical drainage (100) to induce water flow 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 an impermeable layer using a known plastic material, such that it is possible to prevent the vacuum loss by preventing the inflow of air from the outside into the ground (10) based on the configuration of the membrane 500. .

On the other hand, the soil cleaning method using the vertical drainage of the present invention has a step of type the vertical drainage in the soil as shown in FIG. 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 injection pump 200 and the vacuum blower 300 to the vertical drainage (100). In this step, the vacuum blower 300 may be connected to the selected vertical drainage 100, and the injection pump 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 water into the vertical drainage 100 through the injection pump (200). That is to operate the injection pump 200 to inject water into the vertical drainage 100 connected to the injection pump 200 to form a flow of water 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 water into the vertical drainage 100 through the injection pump 200 and extracting contaminants in the soil 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 cleaning system using the present inventors vertical drainage,

3a to 3c is a perspective view showing an embodiment of the vertical drainage in one configuration of the soil cleaning 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 block diagram of a soil cleaning system using the present inventors vertical drainage,

Figure 6 is a block diagram showing a soil cleaning method 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 pump

300: vacuum blower 400: control unit

Claims (11)

A vertical drainage material having a plurality of types in the contaminated ground, the vertical drainage comprising a filter formed of a core and a non-woven fabric surrounding the core; An injection pump connected to the vertical drainage and injecting water into the vertical drainage; Soil cleaning system using the vertical drainage, characterized in that it is connected to the vertical drainage and comprises a vacuum blower for sucking contaminants from the vertical drainage. The method of claim 1, Soil cleaning system using a vertical drainage, characterized in that the core is made of a wavy shape. The method of claim 1, The core is a soil cleaning system using a vertical drainage, characterized in that the flow groove is formed on both sides in the direction of the underground type. The method of claim 1, The core is a soil cleaning system using a vertical drainage, characterized in that the embossing is formed. The method of claim 4, wherein Soil cleaning system using a vertical drainage, characterized in that embossing is formed on both sides of the core in the embossing is formed in the core. The method of claim 1, Soil cleaning system using a vertical drainage, characterized in that the lining layer is configured to surround the vertical drainage in a portion in contact with the ground surface as the upper portion of the vertical drainage. The method of claim 1, The vacuum blower is connected via a plurality of vertical drainage and a vacuum line, respectively, and the injection pump is connected to the soil through a plurality of vertical drainage and injection line, respectively. The method of claim 7, wherein Soil cleaning system using a vertical drainage, characterized in that each vacuum line and injection line is configured with a lock valve. The method of claim 8, Each lock valve is a soil cleaning system using a vertical drainage, characterized in that electrically connected to the control unit. The method of claim 1, Soil cleaning system using a vertical drainage, characterized in that the membrane is composed of the vertical drainage type surface. Type the vertical drainage material into the soil; Connecting an injection pump and a vacuum blower to the vertical drainage; Injecting water into the vertical drainage through an injection pump; Soil cleaning method using a vertical drainage, characterized in that it comprises the step of extracting the soil pollutants from the vertical drainage through a vacuum blower.

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