KR101579241B1 - Multi-contaminated soil's Remediation system using In-Situ Hybrid Soil Flushing and Remediation method using the same - Google Patents

Abstract

One aspect of the present invention provides a purification system for a mixed contaminated soil using an in-situ hybrid soil flushing method capable of efficiently purifying soil contaminated with TPH and heavy metals by mixing vertical tablets based on horizontal calmness The purification system for the contaminated soils using the in-situ hybrid soil flushing according to the embodiment of the present invention is constructed so as to horizontally line the ground at a first depth of soil contaminated with TPH contaminants and heavy metal contaminants And a plurality of anode vertical filling grooves buried in a vertical direction orthogonal to the anode horizontal filling grooves in the soil, and a plurality of anode vertical filling grooves, ; And a plurality of cathode horizontal extraction lines linearly buried in the horizontal direction in the ground at the second depth of the soil An anode tank having a cathode water leveling device including an anode water leveling device and an anode water leveling device including the anode water leveling device, A treatment tank for supplying power to the anode and the cathode so as to form a treatment area defined by a flow distance at which the treatment chemicals containing hydrogen peroxide are moved from the anode to the cathode by electroosmosis; And a power supply unit for causing the TPH contaminants to move from the cathode portion to the treatment region by ion movement while allowing the contaminant containing heavy metal to be extracted from the cathode portion.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a purification system for a contaminated soil using an in-situ hybrid soil flushing method and a purification method using the same,

The present invention relates to a purification system for complex contaminated soil using in-situ hybrid soil flushing and a purification method using the same. More particularly, the present invention relates to a purification system using an in- Thereby forming a treatment area in which oxidative decomposition of oil contaminants is induced by the treatment chemicals, thereby causing the oil contaminants to migrate to the treatment area at the cathode part including the cathode water level, thereby oxidizing and decomposing the oil contaminants, The present invention relates to a purification system for a complex contaminated soil using an in-situ hybrid soil flushing method for improving the purification efficiency of a composite contaminated soil that causes heavy metal-containing contaminants to be extracted, and a purification method using the same.

As a result of the rapid increase of oil consumption due to industrialization and the development of various kinds of organic synthetic materials and their usage is continuously increased, these materials are used in natural environments due to accidents and deliberate discharge in the course of production, And has caused serious environmental pollution. Accordingly, there has been a great demand for development of a technique for recovering contaminated soil. Conventional methods for purifying contaminated soil include chemical oxidation, soil cleaning, and electrochemical purification.

The chemical oxidation method is a method of artificially introducing an oxidizing agent such as hydrogen peroxide into the soil to completely remove the contaminants by water and carbon dioxide. Recently, it is very popular because of its short treatment time and high treatment efficiency. However, oxidizing agent must be supplied to the soil to contact with pollutants for oxidation, but the hydraulic conductivity of the clay soil is too low to inject or contact the chemical oxidizing agent.

Soil cleansing method is a technique of extracting and disposing pollutants adsorbed on the soil by injecting water containing additive for enhancing solubility of water or pollutants into the soil pores through the gutters. The washing solution flowing through the injection wells passes through the contaminated area under the soil, increases the solubility of the contaminants adsorbed on the soil soil, desorbs them from the soil particles, and purges the soil in the contaminated area by pumping it through the extraction well. The soil washing method has a disadvantage in that it is less economical than other processes due to the high cleaning agent cost in treating insecticide, volatile organic compound, and semi-volatile organic compound. In addition, in the case of low permeability soil, the treatment efficiency is lowered because it is restricted by the movement of the washing solution. In addition, there is a possibility of secondary contamination due to a cleaning solution such as a surfactant, In particular, it may lead to the spread of pollutants to saturated areas.

Electrophoresis technology is a method in which electrodes are installed in a soil and electric current is applied to induce electrical, chemical, and hydraulic conduction phenomenon to remove contaminants by moving the fluid in the soil, Can effectively remove contaminants from soil and groundwater by the combined effect of electro-osmosis and ion transport.

One aspect of the present invention relates to a system for purifying a complex contaminated soil using an in-situ hybrid soil flushing method capable of efficiently purifying soil contaminated with TPH and heavy metals by mixing vertical tablets based on the horizontal river bed, And to provide a purification method using the same.

Another aspect of the present invention is that, when the canal is buried in the horizontal direction such as the anode water level and the cathode water level, it can be applied to a large contaminated space in the ground compared with the number of the canals, The present invention provides a purification system for a composite contaminated soil using an in-situ hybrid soil flushing method capable of safely purifying a contaminated soil, and a purification method using the same, .

Another aspect of the present invention is to provide a treatment area in which oxidative decomposition of TPH contaminants is induced by the treatment chemicals containing hydrogen peroxide injected from the upper anode part of the soil, The present invention also provides a purification system for a composite contaminated soil using the in-situ hybrid soil flushing method, wherein the TPH contaminants are oxidatively decomposed by moving the TPH contaminants to a treatment area to improve the purification efficiency of the composite contaminated soil.

Another aspect of the present invention resides in the use of an organic acid having a large OH-buffering ability in the cathode portion to inhibit the inflow of OH- ions generated in the cathode portion due to electrolysis to improve the cleaning efficiency due to hydroxide precipitation of heavy metal ions The present invention is to provide a purification system for a complex contaminated soil using in-situ hybrid soil flushing which can prevent the reduction of the amount of the contaminated soil, and a purification method using the same.

Another aspect of the present invention is to provide a method for producing a composite contaminated soil using an in-situ hybrid soil flushing method in which a surfactant is additionally injected into a cathode portion so that contaminants can be efficiently decomposed by a cleansing action and an oxidative decomposition And a purification method using the same.

A system for cleaning a contaminated soil using in-situ hybrid soil flushing according to an embodiment of the present invention is a system for collecting contaminated soil contaminated with TPH contaminants and heavy metal contaminants at a first depth and sandwiched in a straight line horizontally An anode portion including a cathode horizontal filling hole of the anode horizontal filling grooves and a cathode vertical filling portion including a plurality of anode vertical filling grooves buried in a vertical direction orthogonal to the anode horizontal filling grooves in the soil; A negative electrode portion having a negative electrode water balance including a plurality of negative electrode horizontal extraction tablets linearly buried in a horizontal direction in the second depth from the second depth, and a treatment agent containing hydrogen peroxide in an anode water leveling and anodic orthogonal direction A recovering tank for collecting and storing pollutants containing heavy metals extracted from the cathode water leveling apparatus, A power source is supplied to the cathode portion to form a treatment region defined by a flow distance at which the treatment agent containing hydrogen peroxide is moved from the anode portion toward the cathode portion by electroosmosis, and TPH contaminants are removed from the cathode portion by electro- And a power supply unit for causing the cathode to extract contaminants containing heavy metals.

In addition, the anode water leveling head may include a first horizontal distribution header connected to the first tank through a first supply pump, and a second water level distribution header connected to the first horizontal level distribution header for supplying a treatment chemical containing hydrogen peroxide to the underground contamination space A plurality of anode horizontal injection grooves spaced apart from each other at a predetermined interval in the horizontal direction of the ground, a positive electrode installed in each of the anode horizontal injection grooves in parallel with the anode horizontal injection grooves, And the like.

In addition, the anode vertically is connected to a vertical positive distribution header for supplying processing chemicals containing hydrogen peroxide to the underground contamination space, And a plurality of anode vertical injection pads spaced apart from each other by a predetermined distance in the vertical direction of the ground so as to be alternately arranged.

In addition, the cathode water leveling apparatus includes a plurality of cathode horizontal extraction columns arranged in parallel with each other at a predetermined interval in the horizontal direction in order to extract contaminants containing heavy metals in an underground pollution space, And a third supply pump for recovering the contaminants contained in the heavy metal extracted from the cathode horizontal extraction wells, And a second horizontal distribution header connected to the recovery tank.

The apparatus further includes a pH adjusting agent supply tank for providing a pH adjusting agent for neutralizing OH ^- ions toward the cathode.

In addition, the treatment agent containing hydrogen peroxide may further include any one of citric acid, humic acid, and fulvic acid.

Further, the treatment agent containing hydrogen peroxide is further characterized by containing sodium dodecyl sulfate (SDS).

The first horizontal distribution header includes a plurality of first coupling portions spaced apart from each other by a predetermined distance corresponding to the horizontal horizontal injection holes. The first coupling portion is provided with a first valve and a first coupling tube, And selectively providing a treatment agent containing hydrogen peroxide in the injection wells.

The apparatus may further include a recovery pit provided between the recovery tank and the cathode section for temporarily storing the contaminant containing the heavy metal.

Also, one end of the bipolar vertical injection wells is located on the ground, and the other end is buried so as to be located in a deeper region than the first depth in which the bipolar horizontal injection wells are buried.

In another aspect, the system for cleaning contaminated soils using in-situ hybrid soil flushing according to an embodiment of the present invention is characterized in that, at a first depth of soil contaminated with TPH contaminants and heavy metal contaminants, And a plurality of anode vertical grooves provided in a direction perpendicular to the soil in which the anode water vertical grooves are provided, A negative electrode portion having a negative electrode water balance including a plurality of negative electrode horizontal extraction tabs inserted horizontally in the ground at a second depth of the deep soil relative to the first depth; And a treatment agent containing citric acid; and a recovery tank for recovering contaminants containing heavy metals extracted from the cathode water level, And a treatment area defined by a flow distance at which power is supplied to the anode and the cathode to cause the treatment chemicals containing hydrogen peroxide and citric acid to move from the anode to the cathode by electroosmosis, And a power supply unit for causing the TPH contaminants to move from the cathode portion to the treatment region by ion movement while allowing the contaminant containing heavy metal to be extracted from the cathode portion.

In addition, the anode water leveling head may include a first horizontal distribution header connected to the first tank through a first supply pump, and a second water level distribution header connected to the first horizontal level distribution header for supplying a treatment chemical containing hydrogen peroxide to the underground contamination space A plurality of anode horizontal injection grooves spaced apart from each other at a predetermined interval in the horizontal direction of the ground, a positive electrode installed in each of the anode horizontal injection grooves in parallel with the anode horizontal injection grooves, A vertical orthopedic header connected via a second supply pump to the injection tank and a vertical orthopedic header connected to the vertical orthopowder header for supplying the treatment agent containing hydrogen peroxide to the underground contamination space, And a plurality of anode vertical injection pads spaced apart from each other at a predetermined interval in the vertical direction, A plurality of cathode horizontal extraction columns arranged in parallel with each other at a predetermined interval in a horizontal direction in the ground to extract contaminants from the cathode horizontal extraction columns, And a second horizontal distribution header connected to the recovery tank through a third supply pump to recover contaminants including heavy metals extracted from the horizontal extraction nozzles of the cathode .

A method for purifying a composite contaminated soil using in-situ hybrid soil flushing according to an embodiment of the present invention is characterized in that an anode water leveling, a cathode water leveling, A step of injecting a treatment chemical containing hydrogen peroxide into the anode water column and the anode vertical column, and a step of applying power to the anode water column and cathode water column, The TPH contaminants are removed from the cathode by a movement of electrons while forming a treatment region defined as a region where the TPH contaminants are oxidatively decomposed by hydroxyl radicals generated by reaction with iron in the soil while being moved over a predetermined range in the horizontal and vertical directions of the anode and the cathode, Is moved from the horizontal to the treatment area and oxidized and decomposed by the hydroxyl radical It characterized in that it comprises a; the method comprising the contaminants including heavy metals from the pole calm can be extracted.

In another aspect of the method for purifying a composite contaminated soil using in-situ hybrid soil flushing according to an embodiment of the present invention, the anode water leveling and the cathode water leveling are sequentially buried in a contaminated soil compounded with TPH contaminants and heavy metal contaminants A step of injecting a treatment solution containing hydrogen peroxide into the anode side and the anode side of the anode, and a step of injecting the treatment solution containing the hydrogen peroxide into the anode side and the anode side, The TPH contaminants are oxidized and decomposed by the hydroxyl radicals generated by reacting with the iron in the soil while the treatment chemicals containing hydrogen peroxide are moved over a predetermined range in the anode and the anode by applying electric power to the cathode water level. The TPH contaminants are removed from the cathode by the electro-ion migration while forming a treatment region defined by the region And then causing the water to be oxidatively decomposed by hydroxyl radicals and causing the contaminants containing heavy metals to be extracted from the cathode water level.

Therefore, the purification system for the contaminated soil using the in-situ hybrid soil flushing method according to the embodiment of the present invention and the purification method using the same are characterized in that the soil mixed with the TPH contaminant and the heavy metal contaminant It is possible to purify the exhaust gas efficiently.

In addition, the purification system of the contaminated soil using the in-situ hybrid soil flushing method according to the embodiment of the present invention and the purification method using the same are characterized in that, as the anode water level and the cathode water level are buried in the horizontal direction, It is possible to apply to the large contaminated space in the ground as well as to avoid the interference object while minimizing the number of vertical polarization in the case of a lot of underground interferences such as underground burials, .

In addition, the purification system for the contaminated soil using the in-situ hybrid soil flushing according to the embodiment of the present invention and the purification method using the same are characterized in that oxidation treatment of the TPH contaminants by the treatment chemicals containing hydrogen peroxide injected from the upper anode portion of the soil And the TPH contaminant is oxidized and decomposed by moving the TPH contaminant to the treatment area by the electro-ion movement in the lower cathode part of the soil, thereby improving the purification efficiency of the contaminated soil.

In addition, a purification system for a contaminated soil using in-situ hybrid soil flushing according to an embodiment of the present invention and a purification method using the same are characterized in that an OH-buffering organic acid is used in the cathode, It is possible to prevent the influx of the ions into the cathode portion and to prevent the decrease in the cleaning efficiency due to the precipitation of hydroxide ions of heavy metals near the cathode portion.

In addition, a purification system for a contaminated soil using in-situ hybrid soil flushing according to an embodiment of the present invention and a purification method using the same, further include an effect of stably decomposing hydrogen peroxide by further injecting an anionic surfactant into the anode portion .

FIG. 1 is a block diagram illustrating a system for purifying a contaminated soil using in-situ hybrid soil flushing according to an embodiment of the present invention. Referring to FIG.
FIG. 2 is a top plan view of a combined polluted soil purification system using in-situ hybrid soil flushing according to an embodiment of the present invention. FIG.
FIG. 3 is a bottom plan view of a system for purifying contaminated soils using in-situ hybrid soil flushing according to an embodiment of the present invention.
FIG. 4 is a view illustrating a process of purifying oil contaminants in a complex contaminated soil purification system using in-situ hybrid soil flushing shown in FIG. 1;
FIG. 5 is a view illustrating a process of purifying heavy metal contaminants in a complex contaminated soil purification system using in-situ hybrid soil flushing shown in FIG. 1. FIG.
FIG. 6 is a photograph showing a purification system for a contaminated soil using in-situ hybrid soil flushing according to an embodiment of the present invention.
7 is a view illustrating a method of purifying a complex contaminated soil using in-situ hybrid soil flushing according to an embodiment of the present invention.
FIG. 8 is a view illustrating a system for purifying a contaminated soil using in-situ hybrid soil flushing according to another embodiment of the present invention. Referring to FIG.
FIG. 9 is a view showing the result of analysis of the presence of heavy metals continuously extracted according to an embodiment of the present invention.
FIG. 10 is a diagram showing a result of the verification of region A according to the embodiment of the present invention.
11 is a diagram showing a result of the verification in area B according to the embodiment of the present invention.
12 is a diagram showing modeling results of regions A and B according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a view illustrating a system for purifying a contaminated soil using in-situ hybrid soil flushing according to an embodiment of the present invention. FIG. 2 is a schematic view illustrating a system for purifying contaminated soils using in-situ hybrid soil flushing according to an embodiment of the present invention. FIG. 3 is a bottom plan view showing a purification system for a contaminated soil using in-situ hybrid soil flushing according to an embodiment of the present invention, and FIG. 4 is a bottom plan view FIG. 5 is a view showing a process of purifying oil contaminants in a complex polluted soil purification system using in-situ hybrid soil flushing. FIG. 5 is a view showing a purification system of a complex contaminated soil using in- FIG. 2 is a view showing a process of purifying heavy metal contaminants in the process of FIG.

As shown in FIGS. 1 to 5, a system 10a for purifying a contaminated soil using in-situ hybrid soil flushing according to an embodiment of the present invention includes a soil (20) which is compounded with TPH contaminants and heavy metal contaminants (110) including a plurality of bipolar horizontal grooves (112) linearly buried in a horizontal direction in the ground at a first depth of the bipolar horizontal grooves (120) having a plurality of anode vertical grooves (122) buried in a vertical direction orthogonal to the longitudinal direction of the soil (20); and an anode part A cathode part 200 having a cathode water leveling part 210 including a plurality of cathode horizontal extraction tanks 211 linearly buried in a horizontal direction in a horizontal direction and a cathode part 200 having an anode water leveling part 110 and a cathode vertical part An injection tank 300 for supplying a treatment chemical containing hydrogen peroxide into the reaction tank 120, A recovery tank 400 for recovering contaminants extracted at the water leveling unit 210 and purifying the contaminants, and a recovery tank 400 for supplying power to the anode unit 100 and the cathode unit 200, A treatment zone is defined as a treatment distance in which the treatment agent 310 moves from the anode part 100 toward the cathode part 200 and TPH contaminants are generated in the cathode part 200 by the movement of the electrons And a power supply unit 500 for causing the cathode unit 200 to move to a treatment zone and to remove contaminants including heavy metals.

The soil (20) is filled with soil contaminated with oil contamination and heavy metal contamination. Here, oil pollutants may include materials contaminated with TPH (total petroleum hydrocarbon), and heavy metal contaminants may include materials contaminated with zinc, copper, and lead.

The injection tank 300 provides a treatment agent 310 containing hydrogen peroxide to the anode portion 100. The injection tank 300 supplies a treatment agent 310 containing hydrogen peroxide to the anode part 100 to remove the treatment area 310 from which the direct oxidative decomposition of the TPH contaminant present in the soil 20 is induced by the hydroxyl radical zone is formed.

Here, the treatment agent 310 containing hydrogen peroxide may further include a chelating agent or a surfactant in addition to hydrogen peroxide.

The chelating agent may include any one of Citric Acid, Humic Acid and Fulvic Acid.

The surfactant is connected to the anode part 100 so as to increase the stability of the hydrogen peroxide and is provided to the upper side of the soil 20 to delay the decomposition rate of the hydrogen peroxide.

That is, the surfactant may include a surfactant that prevents the hydrogen peroxide from being rapidly decomposed into hydroxyl radicals having a short survival time by the Fenton oxidation reaction. Such a surfactant may be selected from sodium dodecyl sulfate (SDS), sodium dodecylbenzene sulfonate (SDBS), preferably sodium dodecyl sulfate (SDS).

The treatment agent 310 containing hydrogen peroxide introduced into the complexed soil 20 reacts with the metal salt of the soil 20 to form hydroxide radicals and metal oxides wherein the resulting metal oxide is sodium dodecylsulfate SDS) to form a complex.

As described above, the complex formed from the metal oxide and sodium dodecyl sulfate (SDS) serves as a stabilizer for delaying the decomposition rate of hydrogen peroxide, so that even when a small amount of hydrogen peroxide is treated, a constant purification effect is attained in the treatment zone .

The anode part 100 includes a plurality of anode horizontal injection pellets 112 linearly embedded horizontally in the ground at a first depth of the soil 20 complexly contaminated with TPH contaminants and heavy metal contaminants, And a vertical anode 120 containing a plurality of anode vertical injection pellets 122 buried in the vertical direction orthogonal to the anode horizontal injection pellets 112 in the soil 20 .

The anode water leveling column 110 includes a first horizontal distribution header 111 connected to the injection tank 300 through a first supply pump 114 and a treatment agent 310 containing hydrogen peroxide in an underground contaminated space A plurality of anode horizontal injection pads 112 connected to the first horizontal distribution header 111 to be spaced apart from each other in the horizontal direction at predetermined intervals and a plurality of anode horizontal injection pads 112 arranged in parallel with the anode horizontal injection pores 112 And positive electrodes 113 provided in each of the anode horizontal injection wells 112 in the direction of the arrows.

The first feed pump 114 provides the first medicament distribution header 111 with the treatment chemicals 310 containing hydrogen peroxide stored in the injection tank 300.

The first water level distribution header 111 is disposed on the ground adjacent to the injection tank 300 and transfers the treatment chemicals 310 containing hydrogen peroxide stored in the injection tank 300 to the plurality of anode horizontal injection tanks 112 The first horizontal distribution header 111 may be fixedly installed horizontally on the ground by pedestals provided at both ends.

The first horizontal distribution header 111 may have a circular shape, an elliptical shape, or a polygonal shape having a hollow therein. The first horizontal distribution header 111 may include a plurality of anode horizontal injection tabs 112, A plurality of first engaging portions 115 are formed spaced apart from each other at predetermined intervals.

The first valve 116 and the first connection tube 117 are sequentially installed on the plurality of first coupling portions 115 of the first horizontal balance distribution header 111 so that the hydrogen peroxide So that the treatment agent 310 including the treatment agent 310 can be selectively provided.

A plurality of the anode horizontal injection tanks 112 are connected to the first horizontal distribution header 111 and the first connection tubes 117 to supply the treatment chemicals 310 containing hydrogen peroxide to the underground contaminated spaces, And are spaced apart from each other at a predetermined interval in the horizontal direction.

Each bipolar horizontal injection wells 112 are linearly embedded horizontally in the ground at a first depth of the soil 20 so as to lie on the same horizontal line as the ground.

In this way, it is possible to apply a relatively large amount of contaminated space in the ground compared with the number of pipes by using the anode horizontal injection wells 112, which are linearly buried in the horizontal direction in the horizontal direction, It is possible to easily extract the pollutant from the contaminated space.

Each of the anode horizontal injection holes 112 is provided with a pair of positive electrodes 113 which are arranged on both sides of each anode horizontal injection hole 112 in a direction parallel to the anode horizontal injection hole 112, As shown in FIG. As the positive electrodes 113, conductors such as graphite, stainless steel, and titanium having chemically inert and conductive properties can be used.

The anode vertical column 120 includes a vertical orthogonal distribution header 121 connected to the injection tank 300 through a second feed pump 123 and a treatment agent 310 containing hydrogen peroxide in an underground contaminated space And a plurality of bipolar vertical injection nozzles 122 connected to the vertical distribution header 121 and installed at predetermined intervals in the vertical direction.

The second supply pump 123 supplies the treatment chemicals 310 containing hydrogen peroxide stored in the injection tank 300 to the vertical positive distribution header 121.

The vertical normal distribution header 121 provides a plurality of anode vertical injection nozzles 122 with treatment chemicals 310 disposed on the ground adjacent to the injection tank 300 and containing hydrogen peroxide stored in the injection tank 300 The vertical straight distribution headers 121 are fixed on the ground by pedestals installed at both ends.

The vertical straight distribution headers 121 may have a circular, elliptical, or polygonal shape with a hollow interior, and the vertical straight distribution headers 121 may include a plurality of second vertical vertical injection holes 121, And the engaging portions 124 are spaced apart from each other at a predetermined interval.

The second valve 125 and the second connection tube 126 are sequentially installed on the plurality of second engaging portions 124 of the vertical equal distribution header 121 so that hydrogen peroxide is contained in the anode vertical injection tabs 122 So that the treated medicament 310 can be selectively provided.

A plurality of bipolar vertical injection wells 122 are connected through the vertical connection header 121 and the second connection tubes 126 to supply the treatment chemicals 310 containing hydrogen peroxide to the underground contaminated spaces, respectively And are spaced apart from each other at a predetermined interval in the vertical direction.

Each bipolar vertical injection wells 122 are linearly buried in a vertical direction parallel to the ground. One end of the bipolar vertical injection wells 122 may be located on the ground and the other end may be buried in a deep region relative to the first depth where the anode horizontal injection wells 112 are buried for efficient purification.

Here, it is preferable that each of the anode vertical injection pillars 122 and each of the anode horizontal injection pillars 112 are alternately arranged, . However, it is needless to say that, when there are a lot of underground interference objects such as underground objects, the number of the bipolar vertical injection holes 122 may be adjusted while avoiding the interference object.

The cathode part 200 includes a cathode water leveling part 210 including a plurality of cathode horizontal extraction tanks 211 linearly buried in a horizontal direction in the ground at a second depth of the soil 20, do.

The cathode water leveling unit 210 includes a plurality of cathode horizontal extraction tanks 211 installed in parallel with a predetermined interval in the horizontal direction in order to extract contaminants including heavy metals in the ground contaminated space, Cathode electrodes 212 are disposed on the cathode horizontal extraction tanks 211 so as to be disposed in parallel with the cathode horizontal extraction tanks 211 and are applied with a cathode voltage and contaminants extracted from the plurality of cathode horizontal extraction tanks 211 And a second horizontal distribution header 213 connected to the recovery tank 400 through a third supply pump 214 for recovery processing.

The plurality of cathode horizontal extraction tanks 211 are embedded in the ground horizontally at a predetermined interval in order to extract contaminants containing heavy metals in the ground contaminated space.

Each cathode horizontal extraction trough 211 is linearly embedded horizontally in the ground at a second depth of the soil 20 so as to be on the same horizontal line as the ground.

Each of the cathode horizontal extraction tanks 211 is provided with negative electrodes 212. The negative electrodes 212 are arranged on both sides of each of the cathode horizontal extraction tanks 211 in a direction parallel to the negative As shown in FIG. As the negative electrodes 212, a conductor such as graphite, stainless steel, or titanium which is chemically inert and has conductivity may be used.

The second horizontal distribution header 213 may have a circular shape, an elliptical shape, or a polygonal shape having a hollow therein. In the second horizontal distribution header 213, a plurality of cathode horizontal extraction tabs 211 A plurality of third engaging portions 215 are spaced apart from each other at a predetermined interval.

The third valve 216 and the third connection tube 217 are sequentially installed on the plurality of third engaging portions 215 of the second horizontal distribution head 213 and the third valve 216 and the third connection tube 217 are provided in order, So that contaminants containing heavy metals can be selectively provided.

The pollutant containing the heavy metal recovered through the second water level distribution header 213 may be temporarily stored in the recovery pit 218 and the third supply pump 214 may be temporarily stored in the second horizontal distribution And provides the power for supplying the heavy metal-containing contaminant stored in the recovery pit 218 to the recovery tank 400 through the header 213.

The recovery tank 400 recovers and purifies contaminants containing heavy metals extracted from the cathode part 200. The recovery tank 400 may be filled with a detergent for cleaning contaminants containing heavy metals Of course.

That is, in the system 10a for purifying contaminated soil using the in-situ hybrid soil flushing according to the embodiment of the present invention, the treatment area where the TPH contaminants are treated by the anode water leveling unit 110 and the cathode water leveling unit 210 A treatment zone is formed by supplying power to the positive electrodes 113 of the positive electrode water leveling unit 110 and the negative electrodes 212 of the negative electrode water leveling unit 210, Is defined as a flow distance in which the treatment chemicals 310 containing hydrogen peroxide are moved so that the treatment chemicals 310 containing hydrogen peroxide are moved from the positive electrodes 113 toward the negative electrodes 212 to induce oxidative decomposition of the TPH contaminants. do.

The power supply 500 supplies power to the positive electrode 113 of the positive electrode water leveling plate 110 and the negative electrode 212 of the negative electrode water leveling electrode 210 via the rectifying device 510, Pulse power can also be supplied.

Pulsed copper electrochemical technology is a technology to purify soil contaminated with TPH contaminants and heavy metal contaminants by generating various physical and electrochemical effects with instant pulse power instead of DC power. It is applicable to clay soil which was difficult to clean up pollution can do.

The power supply 500 supplies power to the positive electrode horizontal positive electrode 113 and the negative electrode negative electrode 212 so that the hydrogen peroxide is moved from the positive electrode 113 toward the negative electrode 212 by electroosmosis, A treatment zone is defined as a flow distance at which the treatment agent 310 containing hydrogen peroxide is moved so as to induce oxidative decomposition. At the same time, a TPH contaminant is removed from the cathode unit 200 To the treatment zone.

As a result, the system 10a for purifying contaminated soil using the in-situ hybrid soil flushing according to the embodiment of the present invention punctures the upper and lower sides of the soil 20 complexed with TPH contaminants and heavy metal contaminants, The anode 110 and the cathode water level 210 are inserted into the anode 100 and the cathode 200 respectively and then the cathode 110 is inserted into the anode 110 in alternating fashion, The power supply 500 is connected to supply power to cause electric osmosis and the treatment chemicals 310 containing hydrogen peroxide are injected from the injection tank 300 connected to the anode part 100 to supply the anode part 100 So that contaminants containing the heavy metals of the soil 20 are extracted through the recovery tank 400 connected to the cathode part 200.

The treatment chemicals 310 containing the hydrogen peroxide supplied to the upper side of the soil 20 via the first horizontal distribution head 111 and the horizontal horizontal injection pillars 112 are removed from the anode part 100 by the electric osmosis, The TPH contaminant flows to the treatment zone for oxidizing and decomposing the TPH contaminant present between the cathode unit 200 and the cathode unit 200 on the lower side of the soil 20, So that the TPH contaminant existing between the TPH and the portion 200 can be oxidatively decomposed. At the same time, the material contaminated with heavy metals such as zinc, copper, and lead is recovered to the recovery tank 400 through the cathode horizontal extraction tanks 211 and the second horizontal distribution header 213 of the cathode unit 200, To be processed.

Accordingly, the system 10a for purifying contaminated soil using the in-situ hybrid soil flushing according to the embodiment of the present invention is a system for purifying the contaminated soil using the in-situ hybrid soil flushing method, It can be applied to a large contaminated space in the ground compared to the number of pipes in the horizontal direction. In addition, when there are a lot of underground interferences such as underground burials, the number of vertical pouring holes 122 is controlled, Therefore, it is possible to purify the contaminated soils safely and efficiently.

7 is a view illustrating a method of purifying a complex contaminated soil using in-situ hybrid soil flushing according to an embodiment of the present invention.

As shown in FIG. 7, a method of purifying a composite contaminated soil using in-situ hybrid soil flushing according to an embodiment of the present invention includes: an anolyte vertical and anodic vertical cleaning in a contaminated soil compounded with TPH contaminants and heavy metal contaminants; (S20) of injecting a treatment chemical containing hydrogen peroxide into the anode water leveling and the anode vertical direction, and a step (S20) of applying a power to the anode water leveling and cathode water leveling A treatment that is defined as a region where the TPH contaminant is oxidatively decomposed by hydroxyl radicals generated by reaction with iron in the soil while the treating agent containing the hydrogen peroxide is moved over a predetermined range in the anode water leveling and the anode vertical direction by electro- The TPH contaminants are moved from the cathode water level to the treatment area by electro-ion migration to form hydroxyl groups on hydroxyl radicals. (S30) of allowing the pollutants containing heavy metals to be extracted from the cathode water level of the cathode.

Next, the operation of the system for purifying contaminated soil using in-situ hybrid soil flushing according to an embodiment of the present invention will be described in detail with reference to FIG. 1 to FIG.

The system 10a for purifying contaminated soil using in-situ hybrid soil flushing according to an embodiment of the present invention includes hydrogen peroxide which is an oxidant in a site where TPH contaminants and heavy metal contaminants are present in the complexed soil 20 And the anode water column 210 and the anode vertical column 120 are embedded in the soil 20 in order and the power is supplied to the soil 20 so that the hydrogen peroxide is supplied to the anode And moves toward the cathode water level 210 in the horizontal and vertical cathodes 110 and 120.

The hydrogen peroxide is supplied to the anode water leveling unit 110 defined by the flow distance at which the treatment chemicals 310 containing the hydrogen peroxide are moved so as to induce oxidative decomposition of the TPH contaminants in the anode water leveling unit 110 and the anode vertical anode 120, And the treatment zone in the vicinity of the anode vertical column 120 undergoes oxidative decomposition of the upper TPH contaminant on the soil 20 by hydrogen peroxide and the lower TPH contaminant on the soil 20 is treated in the treatment zone ) And oxidized and decomposed.

That is, the treating agent 310 containing hydrogen peroxide reacts with a metal salt such as iron (Fe ^{2 +} ) present in the soil 20 when moving into the contaminated soil 20, causing a hydroxyl radical Respectively.

Thus, the Fenton oxidation reaction is one of the advanced oxidation processes for oxidizing and decomposing TPH contaminants, and the TPH contaminants are decomposed by the hydroxyl radicals generated by the reaction of the metal salt with the treatment chemicals 310 containing hydrogen peroxide. In the actual soil treatment, since metal salts such as iron are present as minerals in the soil, the fentan oxidation reaction occurs without supplying metal salts such as iron separately.

The hydroxyl radicals (.OH) produced by the Fenton oxidation reaction have a strong oxidizing power and decompose and decompose TPH contaminants and react with heavy metal contaminants to change into harmless compounds.

When the treatment chemicals 310 containing hydrogen peroxide are continuously injected onto the soil 20 while power is supplied to the anode water leveling column 110 and the cathode water leveling column 210 as described above, The TPH contaminants are oxidatively decomposed in a predetermined range defined as a treatment zone and the TPH contaminants are transferred to the treatment zone under the soil 20 so that the TPH contaminants can be oxidatively decomposed. At the same time, the heavy metal contaminants can be extracted to the recovery tank 400 through the cathode water level 210 on the lower side of the soil.

As a result, the system 10a for purifying contaminated soil using the in-situ hybrid soil flushing according to an embodiment of the present invention is a system for purifying contaminated soils using electroosmosis by mixing the vertical cells 120 on the basis of the horizontal cells 110 and 210 It is possible to improve the mobility of the treatment agent 310 containing hydrogen peroxide so that the generated hydroxyl radical reacts with the TPH contaminants distributed in the soil 20 to form a treatment zone in a relatively large space And the TPH contaminant is moved from the cathode electrode 212 to the treatment zone by electrophoresis and contaminants containing heavy metals can be extracted from the cathode unit 200.

Accordingly, the system 10a for purifying contaminated soil using in-situ hybrid soil flushing according to an embodiment of the present invention mixes the TPH contaminants and heavy metal contaminants So that it is possible to purify the contaminated soil very efficiently.

Another embodiment of the present invention will be described with reference to Fig. The same reference numerals are assigned to the same components as those of the above-described embodiment, and a description thereof will be omitted. FIG. 8 is a view illustrating a system for purifying a contaminated soil using in-situ hybrid soil flushing according to another embodiment of the present invention. Referring to FIG.

As shown in FIG. 8, the composite contaminated soil purification system 10b using the in-situ hybrid soil flushing method according to another embodiment of the present invention includes the purification system 10b of the soil (20) complexed with TPH contaminants and heavy metal contaminants (110) including a plurality of anode horizontal injection pellets (112) linearly inserted in a horizontal direction in a horizontal direction at a depth of 1 m to the ground, (120) having a plurality of anode vertical grooves (122) arranged in a vertical direction perpendicular to the longitudinal direction of the soil (20) A negative electrode unit 200 having a negative electrode water leveling table 210 including a plurality of negative electrode horizontal extraction tabs 211 linearly inserted in parallel to each other, An injection tank 300 for providing a treatment agent 310 containing hydrogen peroxide, And, the cathode part 200, OH ^- pH adjusting agent to provide a pH controlling agent for treating an ion neutralizing the supply tank 700;; surfactant feed tank (600) for providing a surface active agent to 200 and the negative electrode A recovering tank 400 for collecting and storing pollutants extracted from the water leveling unit 210 and a treatment agent containing hydrogen peroxide by supplying electricity to the anode part 100 and the cathode part 200 310 are formed in a treatment region defined by a flow distance that is moved from the anode portion 100 toward the cathode portion 200. The TPH contaminants are moved from the cathode portion to the treatment region by electroion movement, And a power supply unit (500) for causing the unit (200) to extract contaminants containing heavy metals.

The cathode portion 200 is connected to a surfactant supply tank 600. The surfactant supply tank 600 supplies the surfactant to the cathode portion 200 to cleanly adsorb the TPH contaminants present in the soil and move to the treatment zone from the cathode portion 200 by electrophoresis do.

In addition, the surfactant injected from the cathode part 200 exists as a monomer in the solution. However, when the concentration of the surfactant is higher than the critical micelle concentration (CMC), micelles are formed. The surface tension of the TPH contaminants and heavy metal contaminants adsorbed on the soil can be reduced to separate the soil from the soil and increase the solubility to increase the removal efficiency.

As a result, the surfactant injected from the cathode part 200 efficiently removes the TPH contaminants by the washing adsorption and the electrophoresis, and at the same time, the heavy metal contaminants can be removed very efficiently by the emulsifying action.

Such a surfactant may be selected from sodium dodecyl sulfate (SDS), sodium dodecyl benzene sulfonate (SDBS), preferably sodium dodecyl sulfate (SDS) have.

Electro osmosis refers to a phenomenon in which the surface of the soil is negatively charged, so that when the ions are densely packed by the attraction force in the vicinity of the soil, the positive ions move from the anode part 100 toward the cathode part 200, This is a phenomenon in which water flows in a direction. The electroosmosis phenomenon causes the hydrogen peroxide to move toward the cathode part 200 by the flow of water so that the contaminants are oxidatively decomposed in the soil.

Here, the oxidative decomposition of contaminants in the soil 20 is actively promoted at the injection site where the hydrogen peroxide is injected, that is, on the soil 20 side of the anode 100, so that the contaminant removal efficiency is high, In another embodiment of the present invention, a surfactant is injected into the cathode part 200 to which no hydrogen peroxide is injected to compensate for the above disadvantages, so that the surfactant cleans and adsorbs the TPH contaminants to form a treatment zone, To be oxidatively decomposed by hydroxyl radicals.

As a result, on the cathode part 200 where the pollutant removal rate has been lowered before, the surface of the soil 20 is cleaned by the oxidizing and decomposing action by the cleaning action of the surfactant and the movement to the treatment zone by the electric movement So that it can be uniformly removed in the section.

Here, the concentration of hydrogen peroxide for formation of the treatment zone can be determined in consideration of the water content of the soil 20, the contaminant concentration and other organic matter contents, and the treatment zone is a treatment zone where the negative electrode 212 ) And the positive electrode (113), so that a more efficient and uniform purification efficiency can be obtained in the whole area of the soil (20).

In the cathode part 200, OH ^- ions generated by the electrolysis in the cathode part 200 during the purification treatment of heavy metal contaminants are transferred to the lower part of the soil 20 by electric transfer and concentration- The purification efficiency may be reduced due to the formation of hydroxide sediments in combination with the heavy metal contaminant moving in the vicinity of the disposed cathode part 200. In addition, purification treatment of the contaminated soil using the in-situ hybrid soil flushing according to another embodiment of the present invention In the system 10b, a pH adjusting agent is injected into the cathode part 200 so that the inflow of OH ^- ions can be suppressed.

Here, the pH adjusting agent injected from the pH adjusting agent supply tank 700 may include an organic acid composed of at least one of citric acid, acetic acid, oxalic acid, and succinic acid. It is needless to say that any one of nitric acid, sulfuric acid, and hydrochloric acid may be further added to the organic acid as the pH adjusting agent injected from the pH adjusting agent supply tank 700.

Accordingly, the cleaning system 10b for the contaminated soil using in-situ hybrid soil flushing according to another embodiment of the present invention further includes a surfactant supply tank 600 and a pH adjusting agent supply tank 700, But also to purify heavy metal contaminants more efficiently.

Example

1. In- Sichuan hybrid  Soil Flushing  Purification system operating condition of complex contaminated soils

division cleaning solution Cleaning agent concentration flux electric current Influence radius Purification period Demonstration driving
Citric acid +
Hydrogen peroxide Citric acid : 0.1M
Hydrogen peroxide: 10% 5L / hr 3v / cm 40 cm 6 months

2. In- Sichuan hybrid  Soil Flushing  Demonstration of the purification system for the contaminated soils used monitoring

The Korea Technology Policy Institute (KERI), selected by the Korea Environmental Industry & Technology Institute, Based on the results of the initial field analysis, two high-density areas were selected and the depth and depth were 0 ~ 0.3m and 0.4 ~ 0.6m, respectively. (Cu, Zn, Pb) and oil (TPH) concentrations were analyzed by sampling the soil at three depths with depths of 0.6-0.9 m.

In order to confirm the migration and removal rates of heavy metals and oils according to the purification period, the purification verification monitoring was performed by collecting the soil five times a week at the beginning of the purification operation and then sampling once a month (six months). We also checked power consumption and drug consumption for economic analysis.

3. In- Sichuan hybrid  Soil Flushing  Demonstration of the purification system for the contaminated soils used monitoring  result

The Yongsan railway site soil was 75% Sand, 16% Silt and 8% clay. The initial average pH was 7.8, the organic matter content was 6 ~ 12%, and the CEC was about 15 cmol / kg. The initial average concentrations of TPH in the soil were 1,240 mg / kg of TPH, 429 mg / kg of Cu, 1,276 mg / kg of Pb and 1,142 mg / kg of Zn in region A and TPH 1,168 mg / kg of Cu, 639 mg / kg of Cu, 2,465 mg / kg of Pb , And Zn 2,769 mg / kg.

As a result of continuous analysis of the presence of heavy metals in the soil, the shapes of 3, 4, and 5 stages are mainly shown as in FIG. The current change was very stable from the beginning.

In order to confirm the removal rates of heavy metals and oil by depth of soil, Korea Environmental Industry and Technology Institute (KEITI) collected samples of high concentration A and B at three depths and five times a week for five days. Oil and heavy metals were analyzed by depth.

FIG. 10 is a diagram showing a result of the verification of the area A according to the embodiment of the present invention, FIG. 11 is a diagram showing the verification result of the area B according to the embodiment of the present invention, and FIG. A and B are modeling results.

As shown in FIGS. 10 to 12, the composite contamination of TPH and Zn showed a similar pattern of purification efficiency.

Specifically, the TPH contamination showed 52%, 61% and 42% of the cleaning efficiency in area A, 30%, 82% and 46% in area B, respectively. %, And 21%, respectively, and the purification efficiencies of B, 38%, 39%, and 36%, respectively.

However, the presence of heavy metals in the site of Pb and Cu remained (fixed), suggesting that a long-term operation approach is required. Overall, the removal rate of Zn was higher than that of Pb, which seems to be due to the fact that the adsorption of Pb heavy metal is larger than that of other metals.

As a result, the purification system using the in-situ hybrid soil flushing method and the purification method using the in-situ hybrid soil flushing according to the embodiment of the present invention show a constant purification reduction efficiency of the oil and heavy metal complex contamination of TPH and Zn contamination, Cu remained (fixed), requiring additional time input and monitoring.

As described above, the purification system of the contaminated soil using the in-situ hybrid soil flushing according to the embodiment of the present invention, and the purification method using the same, mix the TPH contaminants and the heavy metal contaminants The TPH contaminant is oxidized and decomposed by moving the TPH contaminant from the cathode to the treatment area while oxidizing and decomposing the TPH contaminant by the hydrogen peroxide to efficiently purify the soil. So that the purification efficiency of the contaminated soil can be improved. Therefore, many modifications may be made by those skilled in the art without departing from the scope and spirit of the present invention.

10a, 10b ... Complex polluted soil purification system 20 .. Soil
100 ... anode part 110 ... anode water leveling
111 ... first hydrostatic distribution header 112 ... a plurality of bipolar horizontal injection chambers
113 ... Positive electrodes 120 ... Positive polarizers
121 ... vertical positive distribution header 122 ... a plurality of bipolar vertical injection chambers
200 ... cathode part 210 ... cathode water leveling
211 ... a plurality of cathode horizontal extraction tabs 212 ... negative electrodes
213 ... second water level distribution header 300 ... injection tank
400 ... Recovery tank 500 ... Power supply
600 ... surfactant supply tank 700 ... pH adjuster supply tank

Claims (14)

And a plurality of bipolar horizontal injection wells linearly buried horizontally in the ground at a first depth of the soil contaminated with TPH contaminants and heavy metal contaminants; A plurality of cathode horizontal extraction lines embedded linearly in the horizontal direction in the ground at a second depth of the soil, and a plurality of cathode horizontal extraction lines An anode tank having a cathode water leveling device including a cathode and an anode, a fuel tank for supplying a treatment chemical containing hydrogen peroxide to the cathode side of the anode, A recovery tank for collecting pollutants and recovering the pollutants; and a supply tank for supplying electricity to the anode and the cathode, Wherein the TPH contaminant is transferred from the cathode to the treatment area by electrophoresis, while the treatment area defines a treatment area defined by a flow distance at which the processed medicament moves from the anode to the cathode, And a power supply unit for allowing the pollutants containing heavy metals to be extracted from the power supply unit,
Wherein the anode water leveling head comprises: a first horizontal distribution header connected to the injection tank via a first supply pump; and a second horizontal distribution header connected to the first horizontal level distribution header to supply the treatment chemicals containing the hydrogen peroxide to the underground contamination space. A plurality of anode horizontal injectors spaced apart from each other by a predetermined distance in the horizontal direction of the ground, and a plurality of anode horizontal injectors disposed on the anode horizontal injectors in parallel with the anode horizontal injectors, And a positive electrode to which a positive voltage is applied. The system for cleaning a complex contaminated soil using in-situ hybrid soil flushing. delete The method according to claim 1,
The anode vertically-
A vertical straight distribution header connected through the injection tank and the second feed pump,
And a plurality of anodes disposed at predetermined intervals in the vertical direction so as to be alternately arranged with the anode horizontal injection wells to supply the treatment chemicals containing hydrogen peroxide to the underground contamination space, Vertical injection tablets;
Wherein the contaminated soils are treated with an in-situ hybrid soil flushing system. The method according to claim 1,
The negative electrode water-
A plurality of cathode horizontal extraction tanks arranged in parallel to each other at a predetermined interval in the horizontal direction in order to extract contaminants containing heavy metals in the ground contaminated space;
Negative electrodes provided in each of the cathode horizontal extraction tabs in a direction parallel to the cathode horizontal extraction tabs and to which a negative voltage is applied by the power supply device;
A second horizontal distribution header connected to the recovery tank through a third supply pump to recover contaminants containing heavy metals extracted from the anode horizontal extraction columns;
Wherein the contaminated soils are treated with an in-situ hybrid soil flushing system. The method according to claim 1,
Further comprising a pH adjusting agent supply tank for supplying a pH adjusting agent for neutralizing OH ^- ions to the cathode side. The purification system of complex contaminated soil using in - situ hybrid soil flushing. The method according to claim 1,
The treatment agent containing hydrogen peroxide,
The system of claim 1, further comprising at least one of Citric Acid, Humic Acid, and Fulvic Acid. The method according to claim 1,
The treatment agent containing hydrogen peroxide,
Characterized in that it further comprises sodium dodecyl sulfate (SDS). The method according to claim 1,
Wherein the first horizontal distribution headers are spaced apart from each other by a plurality of first coupling portions corresponding to the horizontal horizontal injection holes,
Wherein a first valve and a first connection tube are sequentially installed in the first coupling portion to selectively provide a treatment chemical containing hydrogen peroxide to the anode horizontal injection holes. Contaminated soil purification system. The method according to claim 1,
Further comprising a recovery pit provided between the recovery tank and the cathode to temporarily store contaminants containing a heavy metal. The method according to claim 1,
Wherein one end of the anode vertical injection pellets is located on the ground and the other end is buried so as to be located in a deeper region than the first depth in which the anode horizontal injection pellets are embedded. Of the purification system. A cathode water well having a plurality of anode horizontal injections inserted horizontally in the ground at a first depth of the soil contaminated with TPH contaminants and heavy metal contaminants; An anode portion having a plurality of anode vertical grooves provided in a direction perpendicular to the anode vertical grooves,
A cathode portion having a cathode water leveling pad including a plurality of cathode horizontal extraction wells inserted horizontally in the ground at a second depth of the soil deeper than the first depth;
An injection tank for supplying a treatment chemical containing hydrogen peroxide and citric acid at the anode water leveling and the anode vertical direction,
A recovery tank for recovering and storing pollutants containing heavy metals extracted from the cathode water level,
And a treatment area defined by a flow distance at which the treatment chemicals containing hydrogen peroxide and citric acid are moved toward the cathode part from the anode part by electroosmosis by supplying power to the anode part and the cathode part, And a power supply unit for causing the TPH contaminants to be moved from the cathode unit to the treatment area and allowing the contaminants containing heavy metals to be extracted from the cathode unit,
Wherein the anode water leveling head comprises: a first horizontal distribution header connected to the injection tank via a first supply pump; and a second horizontal distribution header connected to the first horizontal level distribution header to supply the treatment chemicals containing the hydrogen peroxide to the underground contamination space. A plurality of anode horizontal injectors spaced apart from each other by a predetermined distance in the horizontal direction of the ground, and a plurality of anode horizontal injectors disposed on the anode horizontal injectors in parallel with the anode horizontal injectors, And positive electrodes to which a positive voltage is applied,
Wherein the anode vertically is connected to the vertical distribution header through a vertical distribution header connected to the injection tank via a second feed pump and to supply the treatment chemicals containing hydrogen peroxide to the underground contamination space, A plurality of anode vertical injection tabs spaced apart from each other at a predetermined interval in a direction perpendicular to the first direction,
The cathode water leveling apparatus includes a plurality of cathode horizontal extraction columns arranged in parallel to each other at a predetermined interval in the horizontal direction in order to extract contaminants containing heavy metals in the ground contaminated space, And a negative electrode to which a negative voltage is applied by the power supply device, the negative electrode being disposed in each of the negative electrode horizontal extraction wells in parallel to the direction of the negative electrode extraction strips, And a second water level distribution header connected to the recovery tank through a third feed pump. delete delete delete

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