KR102041540B1 - System for remeding soil in saturation zone and unsaturation zone simultaneously - Google Patents

Abstract

The present invention relates to a purification system and a purification method capable of simultaneously purifying a saturated layer and an unsaturated layer of polluted soil in the ground. According to the present invention, the purification system comprises: a plurality of injection tubes inserted into a perforation hole in the ground and installed in the unsaturated layer and the saturated layer; and an injection device for injecting a purifier and air for purifying oil contaminants into the injection tubes. The injection tube comprises: a purifier injection tube forming a sealed area in the perforation hole formed in the unsaturated layer to inject the purifier; and an air inlet tube that injects the air toward the saturated layer to move the oil contaminants remaining in the saturated layer to the unsaturated layer.

Description

Soil unsaturated layer and saturated layer combined purification system {SYSTEM FOR REMEDING SOIL IN SATURATION ZONE AND UNSATURATION ZONE SIMULTANEOUSLY}

TECHNICAL FIELD The present invention relates to the field of environmental technology for purifying soil, and more particularly, to a purifying system and a purifying method capable of simultaneously purifying soil unsaturated layers and saturated layers.

The problem of soil layer and groundwater contamination caused by oil flowing out from gas stations, factories or military storage facilities has recently been highlighted. Oil contaminants are present in the form of nonaqueous phase liquids (NAPLs) when they spill into the soil and contaminate soil and groundwater simultaneously. NAPLs act as a persistent pollutant due to their relatively low solubility, delayed transport properties, and residual saturation in the soil and require purification because they are known to cause toxicity to the receptor, carcinogenicity, growth disorders, and malformations when volatilized to the atmosphere. .

In-situ, which purifies contaminated soil or groundwater in the ground as a method of purifying oil-contaminated soil, and Ex-Situ, which removes contaminated soil or groundwater by moving it from the ground. do. Decontamination methods include soil cultivation methods that excavate contaminated soil and turn it over regularly to supply air, and soil washing methods that clean the excavated soil with a separate cleaning agent. This is a problem that takes a lot.

In-situ purification method is a soil vapor extraction method that vacuums and treats volatile pollutant gases (VOCs). There is a chemical treatment method for injecting a chemical such as to clean the contaminants.

An example of the chemical treatment method is disclosed in "Unsaturated layer residual phase contaminant removal system and method" of the Republic of Korea Patent Registration No. 1410905, the above patent technology is to install a hollow pipe injection well in the underground drilling hole, The cleaning agent is supplied to remove NAPLs, which are contaminants accumulated in the unsaturated layer, by chemical reaction.

However, oil contaminants penetrated from the surface of the earth fall in the form of NAPLs due to gravity, and some of them remain due to capillary action between the voids of the unsaturated layer, and some remain undissolved by moving the saturated layer through the unsaturated layer. In addition, the above patented technology may cause the remaining contaminated areas in the unsaturated layer, and as the cleaning liquid supplied to the unsaturated layer falls and moves to the saturated layer without remaining in the unsaturated layer, There is a burden to supply the cleaning liquid continuously.

Patent Document 1: Republic of Korea Patent Registration No. 1410905 (July 03, 2014)

The present invention was devised to solve the above problems, and the present invention simultaneously purifies NAPLs, which are oil pollutants of the unsaturated layer and the saturated layer, and improves the efficiency of purifying agent injected into the unsaturated layer and the transfer efficiency to the pollutants. The aim is to provide a purification system and a method for purification.

In order to solve the above problems, the present invention is composed of a plurality of pipes are inserted into the perforated hole in the ground and installed in the unsaturated layer and the saturated layer, and the purifier and air for purifying the oil contaminants into the injection pipe inside And an injection device for injecting, wherein the injection pipe forms a sealed area in the perforation hole formed in the unsaturated layer to inject the purifier, and the oil contamination remaining in the saturated layer by injecting the air toward the saturated layer. Provided is a soil unsaturated layer and saturated bed combined purification system having an air inlet tube for moving material to an unsaturated layer.

In the present invention, it is preferable that the injection pipe further comprises a length adjusting tube provided outside the purifier injection pipe and the air injection pipe to adjust the interval between the injection section of the purifier and the injection section of the air.

In the present invention, it is preferable that the length adjusting tube includes a length adjusting inner tube and a length adjusting appearance that are screwed together.

In the present invention, the outer tube of the length-adjustable appearance is deformed by an external force to seal and separate the purifier injection section is sealed or expanded tube by inflation by air injection to the outer diameter of the length-adjusted appearance to partition and seal the purifier injection section is sealed. It is preferable to have a.

In the present invention, the air injection pipe is disposed as the inner pipe of the injection pipe, it is preferable that the purifier injection pipe is disposed on the outside concentric with the air injection pipe.

In the present invention, it is preferable that the purifier injection tube is installed in an unsaturated layer near the interface with the saturated layer, and the air injection tube is installed under the saturated layer spaced apart from the interface with the unsaturated layer.

In addition, the present invention comprises the steps of installing a purifier injection pipe for injecting a purifier injection and the air injection pipe for injecting air into the perforated hole in the ground to install the purifier injection pipe in the unsaturated layer and the air injection pipe in the saturated layer, Injecting air into the air inlet tube and injecting it toward the saturation layer, and injecting a purifying agent into the inside of the purifying agent injecting tube and spraying it toward the closed partial space to move to the unsaturated layer by the air It provides a purification method comprising the step of purifying oil contaminants and oil contaminants in an unsaturated layer.

In the present invention, it is preferable that the purifier injection tube is provided in an unsaturated layer near the interface with the saturated layer, and the air injection tube is installed in a saturated layer spaced apart from the interface with the unsaturated layer.

In the present invention, it is preferable that a partial space of the perforation hole formed in the unsaturated layer is hermetically sealed to install the purifier injection tube in the unsaturated layer.

In the present invention, the air is preferably injected continuously during the injection time of the purifier.

According to the present invention, NAPLs, which are oil contaminants, move to the interface with the unsaturated layer in the upper portion by air injected into the saturated layer, and migrate from the saturated layer with NAPLs remaining in the unsaturated layer by spraying a purifying agent into the voids of the unsaturated layer. The purified NAPLs can be purged together, and the air supplied to the saturated layer is prevented from dropping the purifier supplied to the unsaturated layer, thereby improving the injection efficiency of the purifier.

1 is a view showing the overall configuration of a purification system according to the present invention.
2 is a perspective view of an injection tube according to the present invention.
3 is a partial longitudinal cross-sectional view showing the interior of the injection tube.
4 is a cross-sectional view showing the interior of the injection tube.
5 is a view showing a purifier and the air injection flow of the injection tube.
6 is an operation diagram showing the length adjustment operation of the purifier injection section and the air injection section of the injection pipe.
7 is a view illustrating a sealing operation of the perforation hole around the injection tube.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, embodiments of the present invention illustrated below may be modified in many different forms, and the scope of the present invention is not limited to the embodiments described below.

In the present invention, the unsaturated zone (Unsaturated Zone. USZ) is a soil layer close to the earth's surface, and the pores are not saturated with water, and the saturated zone (SZ) is a soil layer under the unsaturated layer (USZ). As a region saturated with water, the present invention is a system and method for purifying oil-saturated unsaturated layer (USZ) and saturated layer (SZ) together.

Referring to Figure 1, the purification system of the present invention is inserted into the boring hole (H) in the ground as a tube of a predetermined length and the injection pipe 10 is installed in the soil unsaturated layer (USZ) and saturation layer (SZ) underground; The injection pipe 10 includes a purifier for purifying oil contaminants and an injection device 60 for injecting air for moving the oil contaminants.

The injection pipe 10 is a tube of a predetermined length inserted into and installed through the boring hole H formed in the ground, and a plurality of pipes are arranged concentrically. 2 to 4, the injection pipe 10 is formed as an inner pipe, and is provided in the air injection pipe 20, which injects air into the saturated layer SZ, and the air injection pipe 20 concentrically to the unsaturated layer. Bushing 40, the air injection pipe 20 and the purifier injection pipe disposed between and fixed between the purifier injection pipe 30, the air injection pipe 20 and the purifier injection pipe 30 to inject a purifier (USZ) ( It comprises a length adjusting tube 50 provided concentrically on the outside of 30.

The air injection pipe 20 is open to the inner pipe of the purifier injection pipe 30 and the other end is closed and installed in a predetermined section in the vertical direction, and a plurality of air injection holes 20a are disposed in the section located in the saturation layer SZ. Is formed. Air injected into the inside through one end of the air injection pipe 20 is injected into the saturated layer SZ through the air injection port 20a. In this case, the saturated layer SZ into which the air 21 is injected exists as NAPLs, which are oil pollutants, in an insoluble liquid state which is not dissolved in water. When air is injected, as shown in FIG. 1, NAPLs are formed by diffusion. In the aqueous phase, the phase changes into air, which is a mobile phase, through the surface of the water, ascends by buoyancy, and moves to the surface of the saturated layer (SZ). Therefore, NAPLs present in the saturated layer SZ may be moved to the interface with the unsaturated layer USZ by air injection of the air inlet tube 20 and may be removed by a purifying agent described later. In addition, by the pressure gradient according to the rising flow of NAPLs in the saturated layer SZ generated by the injected air, the purifying agent injected into the unsaturated layer USZ suppresses the falling into the saturated layer SZ. Therefore, as the injected purifier remains in the unsaturated layer USZ without leaking, the purifying agent injection efficiency, which is the ratio of the amount of unsaturated layer USZ contaminant removal to the purifying agent injection amount, is increased. On the other hand, the air injection pipe 20 is preferably installed in the saturation layer (SZ) spaced apart from the interface with the unsaturated layer (USZ), so that the contaminants in the saturation layer (SZ) by the injected air moves to the interface. Do.

The purifier injection pipe 30 is open at the outside of the air injection pipe 20 and the other end is closed and installed in a section smaller than the length of the air injection pipe 20 in the vertical direction, which is located in the unsaturated layer USZ. A plurality of purifier injection holes 30a are formed in the section. The purifier injected into the interior of the purifier injection pipe 30 through one end is injected into the unsaturated layer USZ through the purifier injection port 30a. The injection flow of the purifier and air in the injection tube 10 is shown in Figures 5 and 6, in which the air is blue and the purifier is shown in red. The purifier injected into the unsaturated layer USZ through the purifier injection port 30a may use an oxidizing agent such as peroxide, ozone, and permanganate, and the injected oxidant oxidizes and decomposes NAPLs. As described above, the purifier injection tube 20 is saturated layer SZ such that NAPLs moved to the interface between the unsaturated layer USZ and the saturated layer SZ are purified by the air injected through the air injection tube 20. Purifying agent is installed to the unsaturated layer (USZ) close to the interface of the.

To be provided with length coordinator 50 to adjust the spacing of the air injection tube air injection period (△ H ₂₎ and a cleaning agent jetting period (△ H ₁₎ of the cleaning agent inlet tube 30 of the 20, the injection pipe ( 10) consists of a pair spaced apart in the longitudinal direction. The length adjusting tube 50 disposed in the upper portion is coupled to the outer diameter of the purifier injection tube 30, and the length adjusting tube 50 disposed in the lower portion is coupled to the outside of the air injection tube 20. The length adjusting tube 50 is composed of a length adjusting inner tube 51 and a length adjusting outer body 52 to be screwed, and as shown in FIG. 6, a screw coupling of the length adjusting inner tube 51 and the length adjusting outer body 52 and By the release, the length of the air jet section ΔH ₂ and the purifier jet section ΔH ₁ can be adjusted.

Therefore, by restricting the areas of the unsaturated layer USZ and the saturated layer SZ that are highly polluted, the air and the purifying agent may be concentrated and purified. In addition, the length adjustment facade 52 is provided with a sealing means for dividing and sealing the purifier injection section (△ H ₁ ) to which the purifier is injected, the sealing means is provided so as to be spaced apart a predetermined section on the outer diameter of the length adjustment facade (52). A pair of packings 53 and a pair of packings 53 are provided adjacent to the pair of packings 53 and slide along the outer diameter of the length-adjusting exterior 52 to press the packings 53, and a pair of packings ( 53 may be provided adjacent to the fixing piece 55 to be fixed. The packing 53 is formed of a synthetic resin material that is deformed in a horizontal direction when pressurized, and as shown in FIG. 7, one side is fixed by the fixing piece 55 and is pressed in the horizontal direction by the pressing piece 54. The volume expands to seal the drilling hole (H), by selectively injecting a fluid for pressurizing the pressing piece 54 into the underground drilling hole (H) in the lower and upper portions by using a separate injection tube (57) Press piece 54. As a sealing means, a pair of expansion tubes which are spaced apart by a predetermined distance from the outer diameter of the length adjustment outer body 52 may be used, and the purifier injection section ΔH ₁ may be partitioned by inflation with external air. In this way, by purifying and spraying the purifying agent injection section ΔH ₁ is sealed, the purifying agent can effectively penetrate into a plurality of pores of the unsaturated layer (USZ) not saturated with water, thereby increasing the purification efficiency.

Accordingly, the length coordinator 50 in accordance with not only to hermetically partition the unsaturated layer (USZ) spraying interval (△ H ₁₎ within the through hole, the height adjustment of the cleaning agent jetting period (△ H ₁₎ are possible, unsaturated It can be purified by intensively spraying a purifying agent by limiting only the highly contaminated area in the layer USZ.

The injection device 60 is a device for injecting a purifier and air into the injection pipe 10 installed on the ground and installed in the ground. The purifier storage tank 61 and the purifier injection pipe 30 are configured to inject a purifier. It is connected to the purifier supply pump 62 for injecting the purifier stored in the purifier storage tank 61, the air inlet tube 20 is connected to the air injector 63 for injecting air. The flow rate of the purifying agent and the air injected is controlled according to the degree of contamination of the unsaturated layer USZ and the saturated layer SZ.

Hereinafter, the purification method according to the present invention will be described. 6 is a flow chart illustrating a purification method according to the present invention. Referring to this, the step of installing the injection tube 10 (S100), injecting air into the injection tube 10 toward the saturation layer (SZ) Injecting a step (S110), injecting a purifying agent into the injection pipe 10 (S120) is made.

Installing the injection tube 10 (S100), the purifier injection tube 30 for injecting the purifier, and the air injection tube 20 for injecting air into the boring hole (H) in the underground to insert the purifier injection tube 30 is provided in the unsaturated layer USZ, and the air injection pipe 20 is provided in the saturated layer SZ. At this time, the purifier injection pipe 30 is installed so that the purifier is injected into the unsaturated layer (USZ) close to the interface with the saturated layer (SZ), the air injection pipe 20 is spaced apart from the interface with the unsaturated layer (USZ). It is installed under the saturation layer (SZ). When the purifier injection tube 30 is installed, the purifier injection section ΔH ₁ is partitioned and sealed by using a sealing means provided at an outer diameter thereof. On the other hand, before the injection pipe 10 is installed, the contamination state of the unsaturated layer USZ and the saturated layer SZ to be purified is measured, and the flow rate and injection rate of the purifying agent and air to be injected are determined.

When the injection pipe 10 is installed, the air and the purifier are sequentially injected into the inside, and the step (S110) of injecting the air toward the saturation layer SZ is supplied by the air injector 53 installed on the ground. When the air is blown through the air injection pipe 20, NAPLs existing in the saturated layer SZ are moved to the interface with the unsaturated layer USZ. Then, injecting a purifier into the injection tube 10 (S120), the purifier stored in the purifier storage tank 61 is injected into the saturated layer (SZ) through the purifier injection tube (30). Air is also preferably injected continuously during the injection time of the purifier, which is injected into the unsaturated layer (USZ) located above the saturated layer (SZ) by the pressure gradient according to the rising flow of NAPLs in the saturated layer (SZ). The fall of the purifying agent is prevented, and the purifying agent injection efficiency is increased. While air is injected into the saturated layer (SZ), the purifier injected into the unsaturated layer (USZ) moves to the interface of the unsaturated layer (USZ) in the saturated layer (SZ) and the NAPLs remaining in the unsaturated layer (USZ). Are oxidized and purified together.

Therefore, in the present invention, the air pollutant NAPLs is moved to the interface with the upper unsaturated layer (USZ) by the air injected into the saturated layer (SZ), and by spraying a purifying agent into the fine pores of the unsaturated layer (USZ), The NAPLs remaining in the unsaturated layer (USZ) and the NAPLs transferred from the saturated layer (SZ) can be purified together, and the fall of the purifier supplied to the unsaturated layer (USZ) by the air supplied to the saturated layer (SZ) is prevented. This improves the injection efficiency of the purifying agent.

10: infusion tube
20: air injection pipe 20a: air injection port 30: purifier injection pipe
30a: Purifier injection hole 40: Bushing 50: Length adjusting pipe 51: Length adjusting inner pipe 52: Length adjusting appearance 53: Packing 54: Pressurizing piece 55: Fixing piece 60: Injection device 61: Purifier storage tank 62: Purifier supply pump 63: Air injector 70: measuring tube USZ: unsaturated layer SZ: saturated window ΔH ₁ : purifier injection section ΔH ₂ : air injection section H: drilling hole

Claims (11)

A system that simultaneously purifies unsaturated and saturated layers contaminated with oil pollutants.
An injection pipe formed of a plurality of pipes and inserted into a boring hole in the ground and installed in the unsaturated layer and the saturated layer; And
And an injection device for injecting a purifier and air for purifying oil contaminants into the injection pipe.
The injection tube,
A purifier injection tube forming a sealed area in the perforated hole formed in the unsaturated layer to inject the purifier, an air injection tube for injecting the air toward the saturated layer to move the oil contaminants remaining in the saturated layer to the unsaturated layer; And a length adjusting tube provided outside the purifier injection tube and the air injection tube to adjust the interval between the injection section of the purifier and the injection section of air. delete The method of claim 1,
The length adjustment pipe is a soil unsaturated layer and saturated bed composite purification system, characterized in that it comprises a length adjustment inner tube and a length adjustment exterior screwed. The method of claim 3,
Soil unsaturated layer and saturated bed composite purification system characterized in that it comprises a packing that is deformed by an external force in the outer diameter of the length-adjusted appearance to partition and seal the purifier injection section. The method of claim 3,
Soil unsaturated layer and saturated bed composite purification system characterized in that it comprises an expansion tube for expanding the outer diameter of the length adjustment appearance by the air injection to partition and seal the purifier injection section. The method of claim 1,
The air injection pipe is disposed in the inner tube of the injection pipe, the soil unsaturated layer and saturated bed composite purification system, characterized in that the purge injection pipe is disposed on the outside concentric with the air injection pipe. The method of claim 6,
The purifier injection pipe is installed in an unsaturated layer near the interface with the saturated layer, the air injection pipe is a soil unsaturated layer and saturated bed composite purification system, characterized in that installed in the saturated layer spaced apart from the interface with the unsaturated layer. delete delete delete delete

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