KR100477765B1 - Double-structural well for remediation of contaminated soil and groundwater - Google Patents

Abstract

The reconstruction well of the double structure, which simultaneously performs the air injection and extraction functions for the underground desaturation zone and the aquifer, is composed of the first double well and the second double well that are spaced apart from each other by a predetermined distance, and the first double well is used for air An unsaturated zone extraction well to extract, a first aquifer injection well extending to the bottom of the unsaturation well extraction well and injecting air into the aquifer and a first air supply pipe for supplying air from the outside to the first aquifer well; The double tablet includes an unsaturated stand injection well for injecting air into the unsaturated zone, a second aquifer injection well for injecting air into the aquifer, and a second air supply pipe for supplying air to the second aquifer injection well from the outside. Further, a high pressure injection well for injecting a liquid substance is further provided within the influence radius of the air formed by the double well.

Description

DOUBLE-STRUCTURAL WELL FOR REMEDIATION OF CONTAMINATED SOIL AND GROUNDWATER}

The present invention relates to an in-situ complex restoration technology capable of simultaneously purifying soil and groundwater contaminated with organic substances and heavy metals, and more specifically, air injection and extraction for underground saturation zones and aquifers. The present invention relates to a restoration scheme of a dual structure that simultaneously performs a function.

With the recent acceleration of industrialization, pollution of soil and groundwater by heavy metals, oils and other harmful substances has become a serious environmental problem. And contaminants spilled from oil and hazardous chemical reservoirs contaminate groundwater through unsaturated zones of soil and increase the range of contamination as they move along groundwater. Therefore, in order to restore the contaminated groundwater, not only the groundwater but also the contaminated soil layer containing a high concentration of contaminants must be restored together.

Restoration techniques to purify sites contaminated with various complex pollutants can be largely divided into in-situ treatment and ex-situ treatment. Most of the pollution sites where site facilities are operated have very limited application of surface treatment technology. Therefore, in many contaminated sites, underground treatment technology is applied. Underground treatment technology can be divided into physical, chemical, and biological technologies according to the type of technology, and can be divided into soil restoration technology and groundwater restoration technology by environmental media.

Underground soil restoration technology uses soil vapor extraction (SVE), a physical technology that vacuums and treats volatile contaminant gases, and increases the activity of microorganisms in soil by forcibly injecting or extracting air into the soil to increase biological activity. Bioventing (BV), a biological technique for decomposing substances, and Chemical Oxidation (CO), a chemical technique for oxidizing pollutants by injecting powerful oxidants.

Underground groundwater restoration technology uses the Bioslurping (BS) method to vacuum-process fluidic contaminants floating on the groundwater, and pumps the groundwater contaminants using a pump and processes them using water treatment equipment installed on the ground. Pump & Treat (P & T), Airsparging (AS), which blows air into the aquifer using blowers or compressors to decontaminate pollutants, and activates microorganisms in groundwater by blowing air. Biosparging (BS) is used to biodegrade contaminants by increasing biomass.

By pollutant media, there are pollutants present in the gas phase in soil voids, pollutants adsorbed on the soil, fluid phase pollutants floating on the water table due to its lighter weight, and pollutants dissolved in the ground water. Because of such a variety of pollutants, existing underground treatment techniques are almost impossible to purify to the restoration target with a single technique. Therefore, various underground treatment technologies need to be applied, and accordingly, since restoration wells and pipes are separately installed for each treatment technology, it takes a lot of work period, increases installation cost, and does not have high compatibility with various treatment technologies. I have a problem that needs to be done.

The present invention has been made to solve the above problems, by simultaneously performing the injection / extraction of air to the saturation zone and the air injection to the aquifer to provide a restoration structure of a dual structure that can restore the contaminated soil and groundwater The purpose is to provide.

It is another object of the present invention to operate a combination of a first double well that simultaneously extracts air into the unsaturated zone and air injection into the aquifer and a second double well that simultaneously performs air injection into the aquifer and air injection into the unsaturated zone. It is to provide a dual structure reconstruction well.

Another object of the present invention is to install a high-pressure injection device for supplying a liquid material between the first double well and the second double well described above to restore the complex of contaminated soil and ground water that can maximize the purification effect on the contaminated soil and ground water. It is to provide a restoration structure of a dual structure for.

In order to achieve the above object, the restoring well of the dual structure according to the present invention has a predetermined length and a plurality of screens are formed on the lower outer circumferential surface of the unsaturation zone extraction well for extracting air in the non-saturation zone; An aquifer injection well installed to extend to the lower end of the non-saturation zone extraction well and to block the unsaturation zone extraction well and to form a plurality of screens on a lower outer circumferential surface to inject air into the aquifer; And an air supply pipe installed in the unsaturated zone extraction well and communicating with the aquifer injection well to supply air from the outside to the aquifer injection well.

According to another aspect of the present invention, there is provided a non-saturated stand injection tablet having a predetermined length and having a plurality of screens formed on a lower outer circumferential surface to inject air into the unsaturated stand; An aquifer injection well installed on the lower end of the non-saturation stand injection well and extended to be blocked from the non-saturation stand injection well and having a plurality of screens formed on the lower outer circumferential surface to inject air into the aquifer; And an air supply pipe installed in the non-saturated zone injection well and communicating with the aquifer injection well to supply air to the aquifer injection well from the outside.

According to another aspect of the present invention, the reconstructed tablet of the dual structure is composed of a first double tablet and a second double tablet are installed to be spaced apart from each other by a predetermined distance, the first double tablet has a predetermined length and a plurality of screens are formed on the lower outer peripheral surface A desaturation zone extraction well for extracting air in the desaturation zone; A first aquifer injection well installed on the lower end of the unsaturation stand extraction well and extended to block the unsaturation stand extraction well and having a plurality of screens formed on the lower outer circumferential surface to inject air into the aquifer; And a first air supply pipe installed in the unsaturated zone extraction well and communicating with the first aquifer injection well to supply air from the outside to the first aquifer injection well, wherein the second double well has a predetermined length and is disposed on a lower outer circumferential surface thereof. A non-saturation zone injection well in which a plurality of screens are formed to inject air into the nonsaturation zone; A second aquifer injection well installed to extend to the lower end of the non-saturation stand injection well and to block the non-saturation stand injection well and having a plurality of screens formed on a lower outer circumferential surface thereof to inject air into the aquifer; And a second air supply pipe installed in the saturation zone injection well and communicating with the second aquifer injection well to supply air from the outside to the second aquifer injection well.

Preferably, the non-saturated zone extraction well, the first aquifer injection well, the non-saturation zone injection well and the second aquifer injection well form a cylindrical tube shape, and the first and second air supply pipes each of the non-saturation zone extraction well. Located in the center of the positive, the lower block of the unsaturated stand extraction well and the non-saturated stand injection well is provided with a blocking block so as to contact the outer peripheral surfaces of the first and second air supply pipe.

In addition, the screen is preferably a plurality of slots arranged in the vertical direction to face in three directions on the positive outer peripheral surface.

The non-saturated stand extraction well is connected to a gas-liquid separator separating air extracted from the non-saturated stand with a liquid, a vacuum blower providing suction power to the non-saturated stand extraction well, and an adsorption tower for removing contaminants from the extracted air. The injection well and the aquifer injection well are preferably connected to an external air injection device.

At this time, the non-saturated zone injection well and the aquifer injection well are connected to the same air injection device through branch pipes, respectively, and each branch pipe connected to the non-saturated zone injection well and the aquifer injection well adjusts an air injection pressure and a flow rate. It is also preferred that a valve for

Meanwhile, a high pressure injection well for injecting a liquid substance may be further installed within the influence radius of air injected by the aquifer injection well.

Preferably, the high-pressure injection well is formed with a plurality of nozzles in the lower end in a tubular shape in which the lower end is closed, and the high-pressure injection well injects one or more kinds of liquid substances into the ground by a high pressure pump.

In addition, the high pressure injection well is connected to the high pressure pump through a high pressure hose, it is preferable that the high pressure injection well and the high pressure hose is rotatably connected to each other by a hose joint.

In addition, the upper portion of the high-pressure injection well is preferably formed with a pair of handles for holding by hand.

In addition, it is preferable that the high pressure hose is provided with an operation unit for controlling the inflow of the liquid material and a flow meter for indicating the flow rate of the liquid material.

In addition, the liquid substance supplied to the high-pressure injection tablet is composed of some or all of a mixed solution of a surfactant and a catalyst material, a mixed solution of an oxidant and a pH buffer / control solution, and a mixed solution of a microbial agent and a nutrient.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the specification and claims should not be construed as having a conventional or dictionary meaning, and the inventors should properly explain the concept of terms in order to best explain their own invention. Based on the principle that can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention. Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

1 is a view showing a restoration structure of a dual structure for the complex restoration of contaminated soil and groundwater according to the present invention. In the figure, the restoring well of the present invention is shown in which the first double well 10 and the second double well 30 are installed at a position separated by a predetermined interval. It is selected for illustration as one preferred embodiment using the double tablet of the present invention, and the present invention is not limited to this installation structure. In particular, the first double tablet 10 and the second double tablet 30 used in the present invention may also function as independent objects, respectively, may be used together as shown in the figure to act in combination.

Referring to FIG. 1, the first double tablet 10 has approximately an unsaturated zone extraction well 12 and an aquifer injection well 22. Unsaturated zone extraction well 12 extends to the unsaturated zone of the soil, the screen 14 is formed on the lower outer peripheral surface serves to extract the air in the unsaturated zone.

At this time, in order to extract the air in the non-saturation zone, the extraction port 13 of the non-saturation zone extraction well 12 is connected to the external vacuum blower 120, the air in the non-saturation zone by the suction of the vacuum blower 120 Will be extracted. At this time, the air in the unsaturated zone may contain a small amount of condensed water or groundwater with various contaminants. For this purpose, a gas-liquid separator 110 is installed between the vacuum blower 120 and the unsaturated zone extraction well 12. Therefore, the air extracted through the saturation zone extraction well 12 is introduced into the external gas-liquid separator 110 through the extraction port 13, the liquid is separated and only the gas is adsorbed through the vacuum blower 120. Is supplied. The adsorption tower 130 serves to filter contaminants from the extracted gas, and activated carbon is generally used for the adsorption tower 130.

The aquifer injection well 22 is formed at the lower end of the unsaturated extraction well 12, and is preferably formed to extend downward from the lower end of the unsaturation well extraction well 12. Of course, the unsaturated stand extraction well 12 and the aquifer injection well 22 are blocked from each other, and the first air supply pipe 20 communicating with the aquifer injection well 22 is installed in the unsaturated well extraction well 12. . The first air supply pipe 20 has an inlet 23 for communicating with the outside, and serves as a passage for delivering external air to the aquifer infusion pipe 22. A screen 24 is also formed at the bottom of the aquifer injection well 22 to serve to supply air to the aquifer.

In addition, the injection port 23 of the aquifer injection well 22, preferably the first air supply pipe 20, is connected to an external air injection device 100 through an air injection line 102, and an air injection device 100. Air is injected by As the air injection device 100, such as a blower or a compressor may be used.

Next, the second double tablet 30 is roughly composed of an unsaturated zone injection well 32 and an aquifer injection well 42, which is structurally very similar to the first double well 10. That is, the unsaturated zone injection well 32 extends to the unsaturation zone of the soil and has a screen 34 formed at the bottom thereof, and is very similar in structure to the unsaturated zone extraction well 12 of the first double well 10. However, the non-saturated stand injection well 32 is for injecting air into the non-saturated stand, and there is a difference in that the inlet 33 is connected to the air injection device 100.

In addition, the aquifer injection well 42 of the second double well 30 has almost the same function and role as the aquifer injection well 22 of the first double well 10. A screen 44 for supplying air is formed. In addition, the second double well 30 is also provided with a second air supply pipe 40 for the aquifer injection well 42, the aquifer injection well 42 is through the inlet 43 of the second air supply pipe (40) It is connected to the external air injection device 100.

At this time, the unsaturated zone injection well 32 and the aquifer injection well 42 of the second double well 30 are for blowing air into the unsaturated zone and the aquifer bed, and are commonly connected to the air injection device 100. In addition, when the first double well 10 is installed together with the second double well 30, the aquifer injection well 22 of the first double well 10 is also connected to the air injection device 100. Therefore, in the present invention, each injection well may be connected to a separate air injection device, but for the sake of simplicity and maximization of efficiency, it is preferable that all injection wells are connected to one air injection device 100. Therefore, each injection well 22, 32, 42 is connected to one air injection device 100 through a branch pipe, and each branch pipe has a flow rate to the corresponding injection well 22, 32, 42 and A valve is installed to regulate the air injection pressure.

As described above, the first double tablet 10 and the second double tablet 30 may be installed and used independently of each other. Preferably, the first double tablet 10 and the second double tablet 30 are disposed at predetermined intervals to operate in combination. That is, the aquifer injection wells 22 and 42 of the first double well 10 and the second double well 30 are injected into the aquifer through the screens 23 and 43 to generate fine bubbles in the ground water, thereby dissolving in the ground water. It increases oxygen and biodegrades pollutants by aerobic microorganisms. In addition, the contaminants having a weak binding force with the groundwater are degassed by the above-described fine bubbles and are phase shifted into the unsaturated zone to change into the gas phase.

In addition, the unsaturated zone extraction well 12 of the first double tablet 10 absorbs air in the unsaturated zone of the surrounding area, thereby sucking and removing contaminants remaining in the unsaturated zone together with the air. At this time, when the vicinity of the unsaturated stand extraction well 12 is stable, the extraction range by the unsaturated stand extraction well 12 is limited to within a specific radius. That is, if there is no flow of air in the unsaturated zone, air extraction by the unsaturated zone extraction well 12 can only be limited to a certain range. However, in the present invention, by installing the second double well 30 in the vicinity of the first double well 10 to force the air into the non-saturation zone through the non-saturation zone injection well 32, to increase the ambient air flow, As a result, the extraction range through the saturation zone extraction well 12 becomes wider. This not only doubles the purification capacity for the saturation zone but also adds the effect of shortening the time required for purification. In addition, the air injected through the saturation zone injection well 32 expands the surrounding air flow and forcibly generates a large amount of fine bubbles in the saturation zone, thereby further enhancing various purification functions by the fine bubbles. It becomes possible.

Figure 2 illustrates in more detail the double tablet used in the present invention. In FIG. 2, only the first double tablet 10 is shown for convenience of description, but since the first double tablet 10 and the second double tablet 30 are substantially similar in structure, the description related to FIG. It should be understood that the same may be applied to (30). Of course, in the following description, the unsaturated zone extraction well 12 is replaced with the unsaturation zone injection well 32 in the case of the second double well 30, and the configuration of both is substantially the same.

Referring to FIG. 2, the double tablet 10 of the present invention preferably comprises a single pipe including an unsaturated zone extraction well 12 and an aquifer injection well 22. The tubing has a diameter of approximately 80-90 mm and a thickness of approximately 3 mm.

At this time, the blocking block 16 is formed at the lower end of the unsaturated stand extraction well 12 to distinguish between the unsaturated stand extraction well 12 and the aquifer injection well 22. In addition, the air supply pipe 20 is installed in the unsaturated stand extraction well 12, and the blocking block 16 is formed to contact the outer circumferential surface of the air supply line 20 from the lower inner wall of the unsaturated stand extraction well 12.

In addition, an extraction port 13 for discharging air extracted from the non-saturation zone to the outside is formed at one end of the non-saturation zone extraction well 12. In the case of the second double tablet 30, the extraction port 13 is replaced by an injection port 33 that sucks air to be injected into an unsaturated zone.

A blocking block 18 for blocking the saturation zone extraction well 12 from the outside is formed at an upper portion of the extraction port 13, and the air supply pipe 20 extends to the outside through the blocking block 18. The upper end of the air supply pipe 20 is formed with an injection hole 23 for injecting air from the outside. The shape of the extraction port 13 and the injection port 23 is well shown in the cross-sectional view of FIG.

In addition, a blocking block 26 for sealing the aquifer injection well 22 from the aquifer is formed at the lower end of the aquifer injection well 22. The blocking blocks 16, 18, 26 described above each have a thickness of approximately 3 mm equal to the thickness of the pipe.

Screens 14 and 24 are formed below the unsaturated zone extraction well 12 and the aquifer injection well 22, respectively. Screens 14 and 24 are passages used for injecting or extracting air, and as shown in FIG. 4, are a plurality of slots arranged in up and down directions, respectively, in three directions. These slots are preferably arranged at regular intervals upward from the bottom of the saturation zone extraction well 12 and the aquifer injection well 22, ie approximately 100 mm above the blocking blocks 16, 26. Each slot forming the screens 14 and 24 has a width of approximately 1.8 mm and is spaced approximately 15 mm from adjacent slots in the vertical direction. In addition, each slot forms an arc of approximately 60 degrees in the circumferential direction of the ridges 12 and 22, and is disposed so as to be spaced approximately 60 degrees from an adjacent slot on the same circumference. When all the slots are arranged in the vertical direction, the screen 14 of the unsaturated extraction well 12 has a width of approximately 600 mm in the vertical direction, and the screen 24 of the aquifer injection well 22 is approximately 500 mm in the vertical direction. It is designed to have a width of. Thus, each screen 14, 24 will inject or extract air through a number of slots that are constantly arranged in a range of corresponding widths.

Of course, the numerical value of each component in the above description is to describe one preferred example, which is not essential to the present invention, it will be readily apparent to those skilled in the art that various modifications are possible.

Figure 5 shows a combined restoration system using a dual-structure restoring well and a high pressure injection well for injecting a liquid material according to another embodiment of the present invention. This embodiment is almost the same as the previous embodiment, except that a high-pressure injection well 50 for injecting a liquid material between the first double well 10 and the second double well 30 is additionally installed. have.

The high pressure injection well 50 used in the present embodiment has a plurality of nozzles 52 formed at the bottom thereof, and the nozzles 52 serve as a passage for injecting a liquid material into the aquifer layer. In addition, the high pressure injection well 50 is connected to the external high pressure pump 140 through the high pressure hose 54, the flow meter 142 is installed on the high pressure hose 54 to represent the total flow rate. In addition, one or more tanks, preferably three tanks 150, 152 and 154, are connected to the high pressure pump 140, and each of the tanks 150, 152 and 154 has a liquid material to be supplied to the high pressure injection well 50. Stored.

Examples of the liquid substance to be stored in the tanks 150, 152 and 154 include, for example, a mixed solution of a surfactant and a catalyst material, a mixed solution of an oxidizing agent and a pH buffer / regulator, and a mixed solution of a microbial agent and a nutrient and heavy metals. Stabilizers can be used. Only some of these mixed solutions may be stored, and other liquids may be additionally stored in addition to these mixed solutions. Of course, the number of tanks 150, 152, 154 is determined by the number of types of liquid to be stored. In addition, the high-pressure injection well 50 may apply all of the biological methods, chemical oxidation methods, chemical stabilization methods, etc., to the soil, depending on the type of liquid substance stored in the tanks 150, 152, and 154.

6 separately shows an example of the high-pressure injection well 50 used in this embodiment. Referring to FIG. 6, the high pressure injection well 50 of the present embodiment is connected to the high pressure pump 140 through the high pressure hose 54. The high pressure injection well 50 is made of SUS material, preferably having a size of approximately 25A. In addition, the high pressure hose 54 is made of a material having a high durability and corrosion resistance and excellent flexibility to deliver the liquid material. In addition, the high pressure pump 140 should be selected to be able to maintain the conditions of high pressure / low flow rate. If a pump having a high pressure / high flow condition is used, the pump may cause ground fracture when the liquid material is injected into the ground, and ground subsidence or channeling may occur. In addition, although not shown, the fence around the place where the high-pressure injection well 50 of the present embodiment is installed to prevent the liquid material and the soil from overflowing into the slurry phase depending on the type of soil or the groundwater level. It can also be installed separately.

The high pressure injection well 50 and the high pressure hose 54 are connected to each other via a hose joint 58 to allow free rotation with each other.

Referring back to Figure 6, the high-pressure injection well 50 of the present embodiment is provided with a pair of handles 56. The handle 56 is firmly fixed to the high pressure injection well 50 and allows the user to grip the hand and rotate the high pressure injection well 50. Thus, the user can insert the high pressure injection well 50 to the desired depth of the saturation zone and the aquifer while rotating the high pressure injection well 50 with the handle 56. And, since the high-pressure injection well 50 of the present embodiment has a high-pressure injection force, it is possible to inject a liquid material to the desired depth in the ground without a separate drilling (Boring). Of course, when the excavation work using only the high-pressure injection well 50 is difficult depending on the site conditions, it is also possible to insert the high-pressure injection well 50 after the excavation work by mobilizing a separate boring equipment.

Moreover, the operation part 60 is provided in the high pressure hose 54. As shown in FIG. The operation unit 60 is for operating to supply the liquid substance stored in the tanks 150, 152, and 154 to the high pressure injection well 50, and is preferably made in the form of a gun.

In addition, the high pressure hose 54 is connected to the flow meter, high pressure pump, storage tank and the like shown in FIG.

In general, when injecting a liquid material into the ground, the effective mixing of the injected liquid material has a great effect on the treatment efficiency of groundwater. That is, the mixing of the liquid substance is limited simply by putting the liquid substance in the ground. Therefore, the high-pressure injection well 50 of the present embodiment performs high-pressure injection so that the liquid material is more effectively diffused in the ground, and the nozzle 52 formed at the lower end of the high-pressure injection well 50 is used to maintain the high pressure in the liquid material. To finely disperse. Therefore, the nozzle 52 formed in the high-pressure injection well 50 of the present embodiment has a very fine diameter and is formed in a constant arrangement at the lowermost and circumferential portions of the high-pressure injection well 50 so as to inject a liquid material in a wide direction. Is formed. It is preferable that the number of the nozzles 52 is 5-10, and consists of the nozzle sprayed in a vertical direction, and the nozzle sprayed in a horizontal direction.

On the other hand, the high-pressure injection well 50 of the present embodiment can be utilized as an excavation equipment by itself, it is preferable that the lower end has a pointed shape. At this time, the inclined lower end portion of the high-pressure injection well 50 is continuously hit with the soil during the excavation operation, it may be desirable not to form the nozzle 52 in this inclined portion.

The present embodiment configured as described above uses the high pressure injection well 50 for spraying the liquid material in the ground together with the first double well 10 and the second double well 30, thereby maximizing the water quality of the groundwater. . In particular, the high-pressure injection well 50 is preferably installed within the radius of influence of the air delivered through the aquifer screens 24 and 44 of the first and second double tablets 10 and 30 to inject the liquid material at high pressure. .

Air injected from the aquifer injection wells 22 and 42 of the double well 10 and 30 generates microbubbles around the aquifer injection wells 22 and 42 to form turbulence, and the high-pressure injection wells 50 When spraying a liquid substance from), these liquid substances effectively mix and diffuse within the turbulent flow range. In addition, in the non-saturated zone, the air flow formed by the extraction and injection of air by the non-saturated zone extraction well 12 and the non-saturation zone injection well 32 also promotes mixing and diffusion of the liquid substance.

The function of the high-pressure injection well 50 according to the present embodiment is different depending on the type of the liquid material. That is, when the high-pressure injection well 50 is used in a biological method, the high-pressure injection well 50 serves as an auxiliary role for the combined treatment process of the double well (10, 30). That is, by injecting microbial agents and nutrients capable of decomposing counter pollutants into the liquid phase, the growth conditions of the microorganisms are activated and the treatment speed of the pollutants is increased.

In addition, when the soil contains organic contaminants that are difficult to treat by physical / biological treatment, chemical oxidation may be performed by injecting a strong oxidizing agent and a catalyst through the high-pressure injection well 50. At this time, the oxidant and the catalyst injected into the ground purify the contaminated soil and groundwater to the target value, and the harmful gas generated by the intense reaction of the pollutant and the oxidant is extracted through the desaturation zone extraction well 12 of the double tablet 10. Process.

In addition, when the chemical stabilization method is performed using the high-pressure injection well (50), by injecting a chemical liquid stabilizer to the soil depth contaminated with heavy metals, by promoting a chemical stabilization reaction with heavy metals to prevent heavy metal leaching semi-permanently You can.

The following describes a contaminated soil and groundwater restoration process using the restoration well of the dual structure according to the present invention configured as described above.

Prior to installing the double well of the present invention, the characteristics of the contaminant on the target treatment site are first identified, and then the application of the physical / chemical / biological treatment method is determined.

First, biodegradation of organic materials capable of physical vacuum extraction or biodegradation in the unsaturated zone using only the double tablets 10 and 30 in the first embodiment, biodegradation of dissolved contaminants in the aquifer, The degassing effect removes contaminants first. In this case, very economical and effective physical and biological recovery of contaminated soil and groundwater is possible.

Thereafter, the high-pressure injection tablet 50 is used to inject liquid substances such as microbial preparations, nutrients and ORC (Oxygen Release Compounds) at a desired depth to promote microbial activity and to speed up degradation. These liquid materials are smoothly mixed and diffused with each other under the influence of air bubbles made in the unsaturated zone by the double tablets 10 and 30 and the microbubbles generated in the aquifer to obtain the maximum treatment effect.

If it is difficult to purify the target site to the target value using only the above-described physical / biological methods, a strong chemical oxidant may be applied through the high-pressure injection well 50, and combined with a complex treatment process using the double well 10 and 30 to provide Fenton-like properties. Reaction to restore contaminated soil and groundwater. For effective Fenton-like reactions of water-insoluble organic contaminants, liquid materials are injected in the following order: First, 1 ~ 5% of surfactant is emulsified to emulsify water-insoluble contaminants, then 1 ~ 5% of catalyst is injected, pH adjuster and buffer are injected to adjust pH to 3-4, and then 10 ~ 20% Inject oxidant to treat contaminants. Hazardous gases generated due to the violent reaction between hydrogen peroxide and contaminants are processed by vacuum extraction through the unsaturated zone extraction well 12.

When various liquid substances are injected into the ground as described above, mixing and diffusion of contaminants and liquid substances have a great influence on treatment efficiency and cost. Therefore, when the liquid material is injected within the air influence radius of the double tablet 10 and 30 as in the present invention, a very large benefit can be obtained in terms of processing efficiency and cost for the liquid material.

As described above, although the present invention has been described by way of limited embodiments and drawings, the present invention is not limited thereto and is intended by those skilled in the art to which the present invention pertains. Of course, various modifications and variations are possible within the scope of equivalents of the claims to be described.

The dual-structure restoring well according to the present invention configured as described above may simultaneously perform air injection and extraction for the unsaturated zone and the aquifer using one double well.

In addition, the restoration structure of the double structure according to the present invention can create a constant flow of air in the unsaturated zone by injecting air into the unsaturated zone in one double well and extracting air from the unsaturated zone in another double well.

In addition, the double tablet of the present invention has the advantage that can be injected or extracted to the unsaturated zone and aquifer just by installing a single tablet, reducing the installation cost required to purify the soil and ground water.

In addition, the restoration structure of the dual structure according to the present invention is to install a high-pressure injection well for injecting a liquid material within the above-mentioned double well affects the liquid material injected from the high pressure injection well by the influence of air flow and fine bubbles by the double well. By mixing and spreading quickly, the soil and ground water purification effects can be maximized.

In addition, the high-pressure injection wells used in the present invention can be injected to a desired depth without a separate excavation equipment according to the soil conditions by the high-pressure injection force has its own help to reduce the cost.

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 view showing a restoring well of a dual structure according to a first embodiment of the present invention.

FIG. 2 is a detailed view of one of the reconstruction tablets used in FIG. 1. FIG.

3 is a cross-sectional view showing an upper portion in which an injection hole and an extraction hole are formed in the recovery tablet of FIG.

4 is a cross-sectional view showing a screen formed in the restoration tablet of FIG.

5 is a view showing a restoring well of a double structure according to a second embodiment of the present invention;

6 is a perspective view separately showing the high-pressure injection well used in FIG.

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

10. 1st double tablet 12. Unsaturated stand extraction 13. Unsaturated stand extraction

14, 24, 34, 44 .. Screen 16, 18, 26. Blocking block 20, 40. Air supply line

22,42 .. Aquifer injection well 23,43. Aquifer injection hole 30. Second double well

32. Unsaturated injection hole 33. Unsaturated injection hole 50. High pressure injection well

52..Spray nozzle 54..High pressure hose 100..Air injection device

110. Gas-liquid separator 120. Vacuum blower 130. Adsorption tower

140. High pressure pump 150, 152, 154 Tank

Claims (15)

delete delete delete delete It consists of a first double well and a second double well is installed to be spaced apart from each other by a predetermined distance, The first double tablet, A non-saturated stand extraction tablet having a predetermined length and having a plurality of screens formed on a lower outer circumferential surface thereof to extract air in the unsaturated stand; A first aquifer injection well installed on the lower end of the non-saturation stand extraction well and extended to block the unsaturation stand extraction well and having a plurality of screens formed on a lower outer circumferential surface to inject air into the aquifer; And A first air supply pipe installed in the unsaturated zone extraction well and communicating with the first aquifer injection well to supply air from the outside to the first aquifer injection well, The second double tablet, A non-saturation stage injection well having a predetermined length and having a plurality of screens formed on a lower outer circumferential surface to inject air into the non-saturation stage; A second aquifer injection well installed to extend to the lower end of the non-saturation stand injection well and to block the non-saturation stand injection well and having a plurality of screens formed on a lower outer circumferential surface thereof to inject air into the aquifer; And And a second air supply pipe installed in the non-saturated zone injection well and in communication with the second aquifer injection well to supply air from the outside to the second aquifer injection well. The method of claim 5, The unsaturated zone extraction well, the first aquifer injection well, the unsaturated zone injection well and the second aquifer injection well form a cylindrical tube shape, respectively. The first and second air supply pipes are located at the center of each of the unsaturated extraction wells, And a blocking block is provided at lower ends of the non-saturated stand extraction well and the non-saturated stand injection well so as to be in contact with the outer circumferential surfaces of the first and second air supply pipes. The method according to claim 5 or 6, And the screen is a plurality of slots arranged in a vertical direction to face three directions on the outer peripheral surface of the positive structure. The method according to claim 5 or 6, The unsaturated stand extraction well is connected to a gas-liquid separator separating air extracted from the unsaturated stand with a liquid, a vacuum blower providing suction to the unsaturated stand extraction well, and an adsorption tower for removing contaminants from the extracted air. And said unsaturated zone injection well and said aquifer injection well are connected to an external air injection device. The method of claim 8, The unsaturated zone injection well and the aquifer injection well are connected to the same air injection device through branch pipes, respectively. And each branch pipe connected to the non-saturation zone injection well and the aquifer injection well is provided with a valve for controlling the air injection pressure and the flow rate. The method of claim 5, And a high pressure injection well for injecting a liquid substance is further provided within the influence radius of the air formed by the recovery well. The method of claim 10, The high-pressure injection well is formed with a plurality of nozzles in the lower end in a tubular shape in which the lower end is closed, The high-pressure injection well is a dual structure restoration tablet characterized in that for spraying one or more types of liquid material to the ground by a high pressure pump. The method of claim 11, The high pressure injection well is connected to the high pressure pump through a high pressure hose, And the high pressure injection well and the high pressure hose are rotatably connected to each other by a hose joint. The method of claim 12, And a pair of handles are formed on the upper portion of the high-pressure injection well for holding by hand. The method of claim 13, The high pressure hose restoring well of the dual structure, characterized in that the control unit for controlling the inflow of the liquid material and a flow meter for indicating the flow rate of the liquid material is installed. The method of claim 14, The liquid material supplied to the high-pressure injection well is a mixed solution of a surfactant and a catalyst material, a mixed solution of an oxidizing agent and a pH buffer / control liquid, a mixed solution of a microbial agent and a nutrient and a heavy metal stabilizer Restoration of the structure.