KR101838676B1 - Soil remediation method by in-situ replacement of contaminated soil considering structural stability of small areas and polluted blocks adjacent to facilities - Google Patents

Abstract

The present invention relates to a soil remediation method for improving soil stability, comprising: a first step of disposing a soil remediation apparatus having an out casing and an auger at a puncture site of contaminated soil; A second step of excavating the contaminated area to discharge the contaminated soil to the upper part, and transferring the discharged contaminated soil to the purification process; A third step of injecting a replacement agent through a space inside the auger after drawing out the outcasing and the auger 30 cm; And a fourth step of putting a predetermined amount of the substituting agent and subjecting the same to a weight of the auger, Particle size 0.59 mm to 0.074 mm and the standard number is # 30 to # 200. The space inside the auger is a passage for introducing the substituting agent. The passage is divided into two parts in the lower part. Each passage is provided with a hinge, So that the opening / closing port is separated from or in contact with the hinge as the door rotates in the direction opposite to the hinge or rotates in the hinge direction, thereby opening or closing the door.

Description

TECHNICAL FIELD The present invention relates to a soil remediation method and a soil remediation method, and more particularly, to a soil remediation method using in situ replacement of contaminated soil,

The present invention relates to a soil purification method and apparatus for purging soil after piercing in order to purify soil contamination sites contaminated with heavy metals, oil, organic phosphorus, and the like, and more particularly, to soil pollution contamination with oil or heavy metals The present invention relates to a method for efficiently purifying contaminated soils in the ground by taking into account the stability of structures in a narrow space or a pollution zone adjacent to the facility.

In addition, the present invention relates to a method for effectively replacing contaminated soil in a soil in consideration of the stability of a structure in a narrow space or in a vicinity of a contamination zone where various types of filling materials are applied according to soil conditions.

In general, pollutant outflows caused by illegal landfill disposal of underground oil storage facilities, petrochemical plant related industries, and other oil contaminate soils that are the basis of survival of all terrestrial ecosystems including humans.

Soil contamination does not appear in a short period of time even if the pollutant leaks for a long period of time. However, once polluted, the contamination spreads to the groundwater and nearby rivers as well as the inability to use the soil itself.

Techniques for purifying contaminated soil can be classified into biological methods and physicochemical methods.

The physico-chemical method is a method of purifying by using the physical and chemical properties of the pollutants. There are methods such as soil washing, incineration, solidification, stabilization and solvent extraction. There is a drawback that it can cause contamination.

The biological method is a method of decomposing and removing contaminants by using a microorganism as a contaminant-degrading strain, and there are methods such as soil cultivation, composting, bioventing, and plant restoration. It is cheaper than physicochemical methods and does not cause secondary environmental pollution, but takes a long time to restore contaminated soil.

On the other hand, the soil remediation technology classified by the physicochemical method and the biological method as described above can be divided into a ground treatment method (Ex-situ method) and a ground treatment method (in-situ method) according to the method to which the technology is applied.

The soil treatment method (Ex-situ method) is to grasp the distribution of pollutants in the soil and the physical / chemical characteristics of the soil, excavate the contaminated soil to the extent to be treated, , Which is also referred to as an excavation treatment method, includes a general soil washing.

The in-situ method is a technique to inject the chemicals, oxidants, microorganisms, etc. directly from the ground by inserting the gutters into the ground, and it is a technology that injects cleaning solution, cleaning solution discharging solution, washing effluent treatment facility, Material treatment facilities are installed on the contaminated site, and the washing water is injected and circulated in the contaminated soil to be treated.

Among the physical chemical methods, chemical oxidation, soil vapor extraction (SVE), air sparging, soil flushing, and so on can be applied to the in-situ method. Bio-slurping and so on. Among the biological methods, land-cultivation, bioventing, bioreactor, etc. are applicable to the in-situ method. have.

Generally, the conventional soil in-situ method (in-situ method) using the underground high-pressure injection method purifies the contaminated soil by injecting the cleaning chemical solution from the fixed position through the injection set-up so that the range As shown in FIG. 1, scum is generated on the ground surface due to the injection of the cleaning chemical solution while rotating the injection pellets, thereby disrupting and polluting the vicinity of the work site. .

As disclosed in Japanese Patent Application Laid-Open No. 2002-219444, as disclosed in Japanese Patent Application Laid-Open No. 2002-219444, there is disclosed a method of disposing a contaminated soil to incinerate the contaminated soil, There has been adopted a method in which the contaminated soil is solidified by insolubilizing the cement slurry by a high pressure spray agitation method to insolubilize the contaminated part.

However, in this conventional technique, there is a problem that the method of disposing the contaminated soil after incinerating the contaminated soil can not be employed in a place close to the building, and the work is also large-scale, which increases the processing cost. In addition, the high pressure spray agitation and replacement method of the cement slurry causes a state in which a large amount of solidified cement layer is buried in the ground, so that the ground water is contaminated by the cement component, and there is a problem such as blocking the ground water vein and sinking the ground.

Particularly, in the narrow space or the adjacent section of the facility, the subsidence phenomenon can be a very serious problem.

The object of the present invention is to solve the problems of the prior art, and it is an object of the present invention to provide a method and a system for the purification of soil by stabilizing the soil by variously applying the form of the filling material according to the soil condition, And to provide a soil remediation method considering the stability of the structure.

It is another object of the present invention to solve the problems of the prior art, and it is an object of the present invention to provide a method and apparatus for continuously performing punching work, And to provide a soil remediation method considering the stability of structures in a narrow space and adjacent pollution sections adjacent to facilities.

It is another object of the present invention to provide a soil purification method considering the stability of a structure of a narrow space for preventing soil depression through application of an out casing and a contaminant adjacent to the facility, will be.

According to an aspect of the present invention, there is provided a soil purifying method,

A first step of placing the outcasing and the auger at puncture points of the contaminated soil;

A second step of excavating the contaminated area to discharge the contaminated soil to the upper part, and transferring the discharged contaminated soil to the purification process;

A third step of injecting a replacement agent through a space inside the auger after drawing out the outcasing and the auger 30 cm;

And a fourth step of putting a certain amount of the substituting agent and performing a compaction operation with the weight of the auger.

The method comprises:

A fifth step of repeating the third step and the fourth step and repeating the drawing operation;

And a sixth step of raising the soil in the working area after the drawing operation.

The method comprises:

And the sixth step of measuring the degree of contamination by the verification test when back filling up to the top is completed.

It is preferable that the above-mentioned substituting agent is at least one of geolite, cedar, selected earth, coconut and rice cake.

In the case of a dry soil, fine particles of a substituting agent are injected to fill and compaction.

In the case of wet soil, water is discharged using a decantation pump and filled with a substituting agent.

In the case where the groundwater is more than the reference value, the well screen is installed to discharge the groundwater to the outside, and the replacement agent is composted.

And an outcasing is applied at the time of soil dump.

According to the embodiment of the present invention configured as described above, the shape of the filling material can be variously applied according to the soil condition, so that the soil can be stabilized while stabilizing the ground.

In addition, in the embodiment of the present invention, the piercing operation, the infiltration of the clay and the filling material can be continuously performed, and the ground stability can be improved through the bottom-up filling and compaction.

In addition, in the embodiment of the present invention, soil depression can be prevented by application of the outcasing.

In addition, the embodiment of the present invention minimizes the influence on the stability of surrounding buildings and structures due to compaction by injecting the clay and the filling material after excavation of the contaminated soil.

1 is a flowchart of a soil remediation method according to the present invention.
FIG. 2 is a view showing the concept of preparing, digging, drawing, and compaction in the soil purifying method according to the present invention.
FIG. 3 is a conceptual diagram illustrating a sequence of operations in a plurality of replacement operations in the soil remediation method according to the present invention.
4 is a view showing an example of perforation in the soil remediation method according to the present invention.
5 is a view showing an example of the specification of the equipment.
Figs. 6 to 8 are diagrams showing examples of Augusta.
FIG. 9 is a view showing the concept of a substituting agent penetration in a wet soil in the soil remediation method according to the present invention.
FIG. 10 is a table showing standards of sand, gravel, soil, etc. as substituting agents.

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

It is to be understood that the present invention is not limited to the disclosed embodiments, but may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Throughout the specification, the same reference numerals are used for the same names.

Furthermore, terms used herein are for the purpose of illustrating embodiments and are not intended to limit the present invention. In this specification, the singular forms include plural forms as the case may be, unless the context clearly indicates otherwise. &Quot; comprises "and / or" comprising "used in the specification do not exclude the presence or addition of one or more other elements other than the stated element. Unless defined otherwise, all terms used herein may be used in a sense commonly understood by one of ordinary skill in the art to which this invention belongs. In addition, commonly used predefined terms are not ideally or excessively interpreted unless explicitly defined otherwise.

Other advantages and features of the present invention and methods for accomplishing the same will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings.

Flow charts and detailed drawings of the soil remediation method according to the present invention are shown in Fig.

The soil purging method according to an embodiment of the present invention may be a direct porthole method using a rod having a plurality of injection nozzles and may be movable. Specifically, the soil purifying method according to an embodiment of the present invention includes:

As shown in FIG. 1, a soil purging device is prepared at a piercing point, and an outcasing and auger are disposed in a contaminated soil (S10).

Then, the auger and the out casing are driven to excavate the contaminated area, the contaminated soil is discharged to the upper part, and the discharged contaminated soil is transferred to the purification process (S20).

Subsequently, a replacement agent is injected through the space inside the auger after 30 cm of outcasing and auger pulling (S30).

After a certain amount of substituting agent is added, compaction is performed using the weight of auger (S40). Substituents are one of the following: geolite, cedar, selected gypsum, clay, rice cake.

Subsequently, the replacing agent and the compaction work are repeated (S30, S40), and the drawing operation is repeated (S50).

Then, the soil in the working area is squeezed after the drawing operation (S60).

Next, after completion of the work, the other contaminated area is cleaned by moving (S70).

Such a process is shown in FIG.

Referring to FIG. 2, preparation, digging, drawing, and compaction operations are shown in a simplified manner.

Referring to FIG. 2, in the excavation, the opening / closing part of the detachable injection part is closed, the opening / closing part is opened when the air is injected into the room, and the opening / closing part is closed in the compaction step.

Here, the shape of the injection part and the shape of the excavation part can be continuously excavated and injected, and this shape can be variously modified.

On the other hand, the order of the plurality of replacement operations is as follows.

The order of replacement work in areas with a wide range of contamination is shifted by a distance smaller than the diameter of the excavating equipment to the side after the first operation.

At this time, the space in which each replacement operation is performed is performed so as to overlap constantly, and the replacement operation is progressed sequentially and repeatedly.

Excavation depths are excavated over the boundary of contamination according to the range of contaminated soil, excavate all the contaminated soil, and introduce substitute.

This concept is shown in Fig.

Hereinafter, the excavation procedure is performed such that the excavation positions are overlapped with each other, and after one line of work is completed, the excavation position is overlapped on the next line. Such an example is shown in Fig.

4 is a view showing an example of perforation in the soil remediation method according to the present invention.

Referring to FIG. 4, the drilling apparatus is drilled to a predetermined depth, and then the drilling rod is used to insert / compaction the replacement agent.

Also, it has relatively low noise and ground vibration, and it can be applied to small places using small equipment.

In addition, when the drilling is performed, the drilled hole can be superimposed on the drilled left and right holes.

In addition, it is applicable to slope 45 ~ 90 degree by applying out casing of soil slope.

FIG. 5 is a view showing an example of equipment specifications in the soil remediation method according to the present invention.

Examples of the internal structure of the auger used in the above process are shown in Figs. 6 and 7. Fig.

6 or 7, the inside of the auger has a space into which a substituting agent (geolite, cedar, cemented sand, cemented earth, rice cake sand, etc.) can be introduced, and a door and a hinge are attached to the lower part, And it has a structure to block the bottom soil from entering the auger again during the compaction work.

The opening / closing port into which the substituting agent is injected can be applied to two types as shown in Fig. 6 or Fig.

In particular, referring to FIG. 6, as the opening / closing port rotates in the downward direction or rotates in the hinge direction, it is separated or brought into contact with the hinge, thereby causing an opening or closing operation.

To this end, a separate driving unit for opening and closing the opening / closing port may be provided.

Referring to Fig. 7, the passage of the displacing agent is divided into two, and each passage is provided with a hinge and a door.

As each opening / closing port rotates in the direction opposite to the hinge or rotates in the hinge direction as shown in Fig. 6, it is separated or brought into contact with the hinge, thereby causing an opening or closing operation.

In the case of the embodiment of FIG. 7, since the opening / closing port into which the substitution agent is input is two, the substitution agent can be promptly inserted.

8 is a view showing another example of the auger.

Referring to FIG. 8, the mesh net material is extracted from the openings of the auger, and the groundwater is extracted from the contaminated area where the aquifer is present during the excavation process.

By extracting the ground water through the extraction well, it induces the smooth operation of the excavation process and prevents the compaction strength due to the groundwater from being weakened when the substitute is added.

In addition, the outcasing is applied together to block the inflow of groundwater from the side and to extract the groundwater through the inside of the extraction well.

Referring to FIG. 8, as the opening / closing port rotates in the downward direction or rotates in the hinge direction, it is separated or brought into contact with the hinge, thereby causing an opening or closing operation. Particularly, the mesh is installed inside the cylindrical body of the predetermined length at the inner portion of the cylindrical passage on the opening / closing port, so that the passage can be made more rigid.

In the case of dry soil, it is characterized by injecting a fine particle substitute such as rice cake or the like to fill and compaction.
Fig. 9 shows a positive displacement method in a wet state.

Referring to FIG. 9, when the substituting agent is introduced, the use of the decontamination pump in the wet soil discharges water to prevent settlement of the soil upon completion of the replacement, thereby stabilizing the soil and reducing the degree of contamination.

As needed, in areas where there is a large amount of groundwater, a well screen is installed after the substitution is completed, the groundwater is continuously discharged to the outside, and the substitution agent is compactioned to continuously stabilize the ground so that the ground stabilization and pollution .

For reference, the particle size of the substituting agent (clay, rice cake, etc.) is as follows.

Substitution agent uses thick sand to extremely fine sand of not less than 1 mm and not less than 0.05 mm and rice cake sand which is used as packing material for road pavement or gas pipe and water pipe is used.

Mochi sand is 0.59 mm ~ 0.074 mm in particle diameter, and sand having a particle size of # 30 ~ # 200 is superior in compaction of ground and quick compaction in water.

For reference, the definitions of gravel, sand, silt and the like are shown in Fig.

Advantages of such a replacement method are as follows.

Substitution works can be applied to contaminated areas where structures are collapsed due to subsidence of structures or general excavation such as retaining walls and slopes.

In addition, it is possible to maintain the strength of the ground by injecting replacement agent after excavating the contaminated soil, and to minimize the influence on surrounding structures, retaining walls, and slopes.

In addition, it is possible to increase the displacement efficiency, stabilize the ground, and inhibit the diffusion of contamination into the substituted region by the compaction process at the time of withdrawal after the replacement agent is introduced.

By applying various substituents, it is possible to use various substituting agents such as geolite, cedar, selective soil, rice cake, celadon, solidifying agent and stabilizer according to the soil pollution condition.

Claims (10)

A soil remediation method for excavating contaminated soil using a soil remediation apparatus equipped with an auger capable of soil excavation and replacing the contaminated soil with a replacement agent by introducing a replacement agent into the excavated soil,
A first step of arranging a soil purging device having an out casing and an auger at a piercing point of contaminated soil;
A second step of excavating the contaminated area to discharge the contaminated soil to the upper part, and transferring the discharged contaminated soil to the purification process;
A third step of injecting a replacement agent through a space inside the auger after drawing the 30 cm of the outcasing and the auger;
And a fourth step of putting a certain amount of the replacement agent and performing a compaction operation with the weight of the auger,
The substituent Particle size 0.59 mm to 0.074 mm, the standard number is rice cake # 30 to # 200,
The space inside the auger is a passage through which the substitution agent is injected. The passage is divided into two parts at the lower part. Each passage has a hinge and a door, and each door rotates in the direction opposite to the hinge or rotates in the hinge direction, And the opening / closing operation of each opening / closing port occurs. The method according to claim 1,
A fifth step of repeating the third and fourth steps and repeating the drawing operation;
And a sixth step of raising the soil in the working area after the drawing operation. The method according to claim 1,
The first step of arranging the soil purification apparatus with the outcasing and auger at the puncture point of the contaminated soil is as follows.
A step of mounting an auger for excavation and a replacement agent into a soil purging device,
Setting the auger to a perforated position,
And a seventh step of measuring the degree of contamination by the verification test when the back up to the top is completed. delete delete The method of claim 3,
In the case of wet soil, water is discharged using a decanting pump, and filled with a substituting agent and compaction is carried out. The method of claim 3,
Wherein the well screen is installed to discharge the groundwater to the outside when the groundwater has a groundwater level higher than a reference value, and to fill and charge the replacement agent. 8. The method according to claim 6 or 7,
And the outcasing is applied at the time of soil decantation. delete A soil remediation method for excavating contaminated soil using a soil remediation apparatus equipped with an auger capable of soil excavation and replacing the contaminated soil with a replacement agent by introducing a replacement agent into the excavated soil,
A first step of arranging a soil purging device having an out casing and an auger at a piercing point of contaminated soil;
A second step of excavating the contaminated area to discharge the contaminated soil to the upper part, and transferring the discharged contaminated soil to the purification process;
A third step of injecting a replacement agent through a space inside the auger after drawing out the outcasing and the auger 30 cm;
And a fourth step of putting a certain amount of the replacement agent and performing a compaction operation with the weight of the auger,
The substituent Particle size 0.59 mm to 0.074 mm, the standard number is rice cake # 30 to # 200,
The space inside the auger is a passage for introducing the substituent,
The passage is provided with a door and a hinge, and the door is separated from or in contact with the hinge as it rotates in the direction opposite to the hinge or rotates in the hinge direction, thereby opening or closing the door,
And a mesh is installed in a cylindrical shape of a predetermined length in a portion inside the cylindrical passage on the opening and closing port.

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