Contaminated soil remediation method through the multiple casing installation

Abstract

The present invention comprises: a casing insertion step in which a casing is inserted while densely vertically drilling and excavating in a honeycomb shape over an area previously measured and analyzed as the location of contaminated soil, and a perforated casing is arranged and installed so that it is positioned at the depth where the contaminated soil is located; a soil separation step in which normal layer soil is separated and moved while drilling to the depth of the normal layer previously measured and analyzed, and then contaminated soil is separated and moved to a purification location while drilling to the depth of the contaminated soil; a contaminated soil purification step in which the separated contaminated soil is purified through a predetermined purification treatment process; a residual contaminated soil purification step in which a purification agent is supplied into the interior of the casing while the plurality of casings are inserted into the ground; and a soil restoration step in which the normal layer soil and purified soil are filled into the drilled area while the casings are inserted. The present invention relates to a method for purifying contaminated soil through the installation of multiple casings, comprising: a preliminary measurement analysis of the contaminated soil, wherein a sample collection tube is inserted into several parts of the stratum where contaminated soil is expected to be present, and the presence of contamination, the area of ​​contamination, and the depth of contamination in each part are measured and analyzed to be used as data for drilling and casing; wherein the casing insertion step allows unexcavated residual contaminated soil to remain in the outer area between adjacent casings while the plurality of casings are inserted into the ground; and wherein the residual contaminated soil purification step allows a purification agent passing through the perforated part of the perforated casing to infiltrate or penetrate into the residual contaminated soil remaining in the area between the adjacent casings.

Description

Technology Field

[0001] The present invention relates to a method for purifying contaminated soil through the installation of multiple casings, and more specifically, to deep contaminated areas (e.g., oil, organic matter, or heavy metal contaminated areas) where it is difficult to excavate soil due to insufficient workspace and entry of excavation equipment in narrow contaminated areas adjacent to buildings, etc. on the ground. , ex-situ Method and in-situ This invention relates to a method for purifying contaminated soil through the installation of a hybrid multi-casing system that combines various methods. Background Technology

[0003] In Korea, since the mid-1990s, dozens of large and small soil contamination remediation projects have been carried out every year. Currently, the methods for remediating contaminated soil stipulated in Article 15-3, Paragraph 1 of the Soil Environment Conservation Act and its Enforcement Decree include: 1) biological treatment such as the decomposition and absorption of pollutants using microorganisms or plants; 2) physical and chemical treatment such as the blocking, separation, extraction, and washing of pollutants; and 3) thermal treatment such as the incineration and decomposition of pollutants.

[0004] The current methods and technological capabilities for remediating soil-contaminated sites in Korea have made it significantly difficult to clean up areas where roads, railways, and buildings are located.

[0005] In this context, among sites where contaminated soil is distributed, sites where active remediation is difficult refer to sites where excavation of contaminated soil is difficult due to large-scale buildings or facilities on the surface or underground electrical, gas, or communication facilities, and where effective remediation is difficult with existing remediation technologies; for such sites where active remediation is difficult, the soil is removed for remediation. ex-situ Because the method cannot be applied, contaminated soil is purified on-site. in-situ A purification method based on the method is being applied.

[0006] For reference, conventional ex-situ The method involves excavating the soil over a wide area up to the depth of contamination to purify it, and the conventional in-situThe method involves installing a vertical well to inject or extract chemicals for purification.

[0007] The above conventional ex-situ The method involves excavating the soil over a wide area up to the depth of contamination, meaning that when excavating deep contaminated soil, the excavation must be wider than the contaminated soil, which results in high costs and reduced site usability. Additionally, there are limitations in the application of the method when above-ground structures are present within the contaminated area, and there is a possibility of problems with site stabilization due to deep excavation.

[0008] Meanwhile, the conventional above in-situ Since the method involves installing vertical wells to inject / extract chemicals for purification, there are problems such as the purification chemicals not reaching the contaminated soil in the case of low-permeability soil or heterogeneous soil, the purification period taking a long time, and soil contaminants leaching into groundwater due to the purification chemicals.

[0009] thus, in-situ Capable of rapidly purifying widely distributed contaminated soil compared to other methods ex-situ While maintaining the advantages of the method ex-situ There is a need for a soil remediation method for contaminated soil, such as oil, organic matter, or heavy metals, that can complement the shortcomings of the current method. Prior art literature

[0011] Korean Registered Patent Publication No. 1271727 (Registered on May 27, 2013) The problem to be solved

[0012] The present invention can overcome the limitations of the prior art and solve problems. ex-situ In the method in-situ As a hybrid method incorporating a method, it involves vertically drilling and excavating contaminated soil in a honeycomb pattern over an area where contaminated soil is distributed while densely inserting casings, separating the excavated normal soil from the contaminated soil, and then re-introducing the contaminated soil after purification treatment. ,The purpose is to provide a method for purifying contaminated soil through the installation of multiple casings, which rapidly purifies widely distributed contaminated soil while simultaneously purifying the contaminated soil remaining between densely inserted casings by injecting purification chemicals into the casings to rapidly purify the remaining contaminated soil in a small volume. means of solving the problem

[0014] The present invention, for achieving the above-mentioned purpose, relates to a method for purifying contaminated soil located at a deep depth below the normal layer and on the ground surface of an area containing above-ground structures, comprising: a casing insertion step of inserting casings while densely vertically drilling and excavating soil in a honeycomb shape over an area previously measured and analyzed as the location of the contaminated soil, wherein the perforated casings are arranged and installed so as to be positioned at the depth where the contaminated soil is located; a soil separation step of separating and moving the normal layer soil excavated while drilling to the depth of the normal layer previously measured and analyzed, and subsequently separating and moving the contaminated soil excavated while drilling to the depth of the contaminated soil to a purification location; a contaminated soil purification step of purifying the separated contaminated soil through a predetermined purification treatment process; a residual contaminated soil purification step of supplying a purification agent into the interior of the casings while the plurality of casings are inserted into the ground; and a soil restoration step of filling the drilled area with the normal layer soil and the purified soil while the casings are inserted. The method may include, wherein the preliminary measurement analysis of the contaminated soil involves inserting a sample collection tube into several parts of the stratum where contaminated soil is expected, measuring the presence of contamination, the area of ​​contamination, and the depth of contamination in each part, and analyzing this to use as data for drilling and casing, and the casing insertion step may involve leaving unexcavated residual contaminated soil in the outer area between adjacent casings while the plurality of casings are inserted into the ground, and the residual contaminated soil purification step may involve allowing a purification agent passing through the perforated part of the perforated casing to infiltrate or penetrate into the residual contaminated soil remaining in the area between the adjacent casings. Effects of the invention

[0016] The present invention involves vertically perforating and discharging soil in a honeycomb pattern over an area where contaminated soil is distributed, densely inserting casings, separating the discharged normal soil from the contaminated soil, and then re-introducing the contaminated soil after purification treatment. , ex-situ While rapidly purifying widely distributed contaminated soil as in the method, for contaminated soil remaining between densely inserted casings, purification chemicals are injected into the casings to purify the remaining contaminated soil in a small volume as usual in-situ By enabling rapid purification compared to the method, the effect of achieving rapid and highly efficient purification of contaminated soil, such as widely distributed oil, organic matter, or heavy metals, is obtained.

[0017] The present invention purifies contaminated soil remaining between densely inserted casings as described above by introducing a purification agent into the casing. In this case, a standard non-porous casing is inserted into the normal soil portion distributed in the normal layer, and a perforated casing is inserted into the portion where contaminated soil is distributed. By allowing the purification agent introduced through the casing to be discharged quickly and smoothly through the perforations of the perforated casing and to penetrate or infiltrate the remaining contaminated soil, a rapid and accurate targeted purification effect is obtained for the remaining contaminated soil.

[0018] The present invention enables rapid and accurate targeted purification of residual contaminated soil as described above, thereby preventing or minimizing the penetration of purification chemicals into unnecessary areas, and thus minimizes the waste of purification chemicals and achieves the effect of reducing purification costs.

[0019] The present invention not only prevents or minimizes the loss of purification chemicals by penetrating into unnecessary areas as described above, but also minimizes the leaching of the purification chemicals themselves or chemical by-products generated during the purification process into groundwater by purifying residual contaminated soil with a small amount of purification chemicals in a small volume, thereby achieving the effect of preventing or minimizing water or environmental pollution.

[0020] The present invention achieves the effect of increasing the accuracy and efficiency of contaminated soil collection by measuring and analyzing the depth and volume of the area where contaminated soil is located within the normal layer in advance through a contaminated soil preliminary analysis step, and providing it as a 3D image with three-dimensional coordinate values, thereby enabling accurate and precise drilling, soil removal, and casing insertion in the area where contaminated soil is located. Brief explanation of the drawing

[0022] FIG. 1 is an illustrative diagram showing an application example of the method for purifying soil contaminated with oil, organic matter, or heavy metals, etc., according to the present invention. FIG. 2 is a sequence block diagram illustrating the steps of the method for purifying soil contaminated with oil, organic matter, or heavy metals, etc., according to the present invention. FIG. 3 is an example diagram of a device briefly illustrating the drilling, soil removal, and casing device and operation according to the present invention. FIGS. 4 and FIGS. 5 are side cross-sectional views illustrating an example of drilling, soil removal, and casing insertion fixation of a stratum according to the present invention. FIG. 6 is a side cross-sectional view illustrating the state of injecting a purification agent through a casing to purify contaminated soil remaining between each casing inserted in a honeycomb shape in the present invention. FIG. 7 is a plan cross-sectional view illustrating the state in which a purification agent is discharged through the perforations of a perforated casing in the present invention and penetrates or infiltrates residual contaminated soil. FIGS. 8a) and 8b) are exemplary diagrams illustrating an example in which contaminated soil remaining between each casing inserted in a honeycomb shape in the present invention is purified into normal soil between the casings. FIG. 9 is a sequence block diagram illustrating another methodological example of the present invention. Specific details for implementing the invention

[0023] Hereinafter, embodiments disclosed in this specification will be described in detail with reference to the attached drawings. Identical or similar components regardless of drawing symbols are assigned the same reference numeral, and redundant descriptions thereof will be omitted. Furthermore, in describing the embodiments disclosed in this specification, if it is determined that a detailed description of related prior art could obscure the essence of the embodiments disclosed in this specification, such detailed description will be omitted.

[0024] Terms including ordinal numbers, such as first, second, etc., may be used to describe various components, but said components are not limited by said terms. These terms are used solely for the purpose of distinguishing one component from another.

[0025] Singular expressions include plural expressions unless the context clearly indicates otherwise.

[0026] In this application, terms such as “comprising” or “having” are intended to specify the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0028] Hereinafter, a method for purifying soil contaminated with oil, organic matter, or heavy metals, etc., according to the present invention will be described in detail with reference to the attached drawings.

[0029] The method for purifying contaminated soil through the installation of multiple casings according to the present invention, as illustrated in the attached drawings FIGS. 1 to 3, is a method for purifying heavy metal contaminated soil located at a deep depth below the normal layer and on the ground surface of an area where above-ground structures are located. It comprises: a casing insertion step (S10) in which multiple rows of casings (1) are inserted vertically into an area previously measured and analyzed as being located, such that the casings (1) are inserted and installed by densely perforating and excavating vertically in a honeycomb shape, and a perforated casing (1) is positioned at the depth where the contaminated soil is located; a soil separation step (S20) in which the normal layer soil excavated while perforating to the depth of the previously measured and analyzed normal layer is separated and moved, and subsequently the contaminated soil excavated while perforating to the depth of the contaminated soil is separated and moved to a purification location; a contaminated soil purification step (S30) in which the separated contaminated soil is purified through a predetermined purification treatment process; and, while the plurality of casings are inserted into the ground, a purification chemical is supplied into the interior of the perforated casing, and the perforated A residual contaminated soil purification step (S40) in which a purification agent passing through the perforated portion of the casing penetrates or infiltrates into the residual contaminated soil remaining unexcavated in the area between the adjacent casings; and a soil restoration step (S50) in which normal layer soil and purified soil are filled into the perforated portion while the casing (1) is inserted.The method includes, wherein the preliminary measurement analysis of the contaminated soil involves inserting a sample collection tube into several parts of the stratum where contaminated soil is expected, measuring the presence of contamination, the contaminated area, and the contamination depth of each part, and analyzing this to use as data for drilling and casing; and the residual contaminated soil purification step (S40) may be such that a purification agent injected along the inner diameter of the casing (1) penetrates into the contaminated soil remaining between each casing through the perforated part of the perforated casing (1), or a purification agent sprayed or discharged when a lifting means introduced into the inner diameter of the casing (1) is positioned at the perforated part of the perforated casing (1) penetrates into the contaminated soil remaining between each casing (1) to perform a purification action.

[0030] The present invention involves inserting multiple rows of casings (1) vertically into an area where contaminated soil is distributed, inserting the casings (1) densely while vertically perforating and discharging soil in a honeycomb shape, separating the normal soil and contaminated soil being discharged, and then purifying and reintroducing the contaminated soil. , ex-situ While rapidly purifying widely distributed contaminated soil as in the method, for the contaminated soil remaining between the densely inserted casings (1), purification chemicals are injected into the casing (1) to purify the contaminated soil remaining in a small volume as in the usual in-situ By enabling rapid purification compared to the method, it is possible to achieve rapid and highly efficient purification of widely distributed heavy metal contaminated soil.

[0031] In addition, regarding the contaminated soil remaining between the densely inserted casings (1) as described above, the present invention purifies the soil by introducing a purification agent into the casing (1). A normal non-porous casing (1') is inserted into the normal soil portion distributed in the normal layer, and a perforated casing (1") is inserted into the portion where the contaminated soil is distributed. By allowing the purification agent to be injected to be discharged quickly and smoothly through the perforations of the perforated casing (1") and to penetrate or infiltrate the remaining contaminated soil, it is possible to achieve rapid and accurate targeted purification of the remaining contaminated soil.

[0032] Furthermore, the present invention enables rapid and accurate targeted purification of residual contaminated soil as described above, thereby preventing or minimizing the penetration and loss of purification chemicals into unnecessary areas, and thus preventing or minimizing the unnecessary waste of purification chemicals, which makes it possible to reduce purification costs.

[0033] Furthermore, the present invention not only prevents or minimizes the loss of the purification agent by penetrating into unnecessary areas as described above, but also minimizes the leaching of the purification agent itself or chemical by-products generated during the purification process into groundwater by purifying residual contaminated soil with a small amount of the purification agent in a small volume, thereby making it possible to prevent or minimize water or environmental pollution.

[0034] The detailed steps of the present invention will be described in more detail below.

[0035] First, the casing insertion step (S10) of the present invention may be a step in which a multi-stage drilling drill (12; screw) is installed vertically and coupled to the drilling drive unit (11) of the auger crane (10) as shown in the attached drawing Fig. 3, and a multi-stage casing (1) that is arranged and coupled to surround the drilling drill (12) is inserted into the drilled area at the same time as the drilling.

[0036] The drilling drill (12) and casing (1) of the present invention described above may rotate forward / reverse by the drilling drive unit (11) and perform a vertical lifting operation.

[0037] When the drilling drill (12) of the present invention is lowered by the drilling drive unit (11) and rotates in the forward direction, it performs a drilling operation on the ground layer, and when it is raised by the drilling drive unit (11) and rotates in the reverse direction, it guides the soil excavated during the drilling process to the ground so that it is discharged.

[0038] At this time, the drilling drill (12) is briefly illustrated in the attached drawing, but the tip may be pointed in a wedge shape, or a blade that improves drilling and soil removal functions may be attached to the tip.

[0039] Additionally, the drilling drill (12) and casing (1) may be used by connecting multiple units according to the drilling depth. In this case, the drilling drill (12) and casing (1) may be connected and used while stationary during drilling, or connected in advance to the required length before use. These optional features can be applied depending on the condition of the stratum requiring drilling and the drilling depth.

[0040] The casing insertion step (S10) of the present invention may be a step in which drilling and soil removal and casing insertion are performed by a drilling drill (12) and a casing (1) installed as a single unit on the drilling drive unit (11) of the auger crane (10).

[0041] As described above, when the drilling drill (12) and casing (1) are installed as a single unit on the drilling drive unit (11) of the auger crane (10) to perform drilling and casing insertion, precise drilling of the ground layer and accurate casing can be achieved, and workability including easy maneuverability and operation for drilling and casing can be secured.

[0042] In addition, the casing insertion step (S10) of the present invention may involve drilling and soil removal and casing insertion being performed simultaneously by a plurality of drilling drills (12) and a casing (1) installed in a multi-axis manner on the drilling drive unit (11) of the auger crane (10).

[0043] As described above, when the drilling drill (12) and casing (1) are installed as a single unit on the drilling drive unit (11) of the auger crane (10) to perform drilling and casing insertion, it is possible to perform rapid drilling and casing operations on the ground layer.

[0044] At this time, the multi-axis of the present invention may have a plurality of drilling drills (12) and casings (1) arranged in a single row with respect to the drilling drive unit (11) (see upper right excerpt of FIG. 3).

[0045] In this way, precise drilling and accurate casing of the strata are achieved, and at the same time, rapid drilling and casing operations are performed; that is, the advantages of both single-axis and multi-axis systems are simultaneously achieved.

[0046] In addition, the multi-axis of the present invention may have a plurality of drilling drills (12) and casings (1) arranged in a square shape including a triangle or a rhombus (see the upper right excerpt of FIG. 3).

[0047] In this way, it is possible to perform rapid drilling and casing operations in a honeycomb pattern on the strata.

[0048] At this time, if the drilling drill (12) and the casing (1) are arranged in a square shape including a triangle or a rhombus, the drilling and soil removal for the contaminated area may not be performed at the outermost edge of the drilling area, and additional work is performed in that area by connecting the drilling drill (12) and the casing (1) to the drilling drive unit (11) of the auger crane (10) as a single unit.

[0049] The casing insertion step (S10) of the present invention may be a step in which a perforated casing (1") to be located in the contaminated soil and a non-perforated casing (1') to be located in the normal layer are sequentially applied according to the depth (distribution location) of the contaminated soil area to enable stepwise perforation, soil removal, and casing insertion, or may further include such a step.

[0050] The above-mentioned casing insertion step (S10) allows for insertion and fixation to be performed simultaneously with the drilling and removal of the casing (1') and the perforated casing (1") by arranging them in sequence according to the depth of the normal layer and the contaminated soil area measured and analyzed in advance.

[0051] At this time, the arrangement of the drilling drill (12) and the casing (1) may be performed while stationary during drilling, or the arrangement may be performed in advance for the required length.

[0052] In addition, the preliminary measurement analysis of the contaminated soil may involve inserting sample collection tubes into various parts of the stratum where contaminated soil is expected to measure the presence of contamination, the contaminated area, and the contamination depth of each part, and then collecting and analyzing the results to use as data for drilling and casing.

[0053] In addition, the preliminary measurement analysis of the contaminated soil may be carried out by combining physical property tests such as soil texture, structure, and color; chemical tests to analyze the concentration of harmful substances present in the soil, such as heavy metals, organic compounds, and phenols; biological tests to analyze the ecosystem of organisms present in the soil, such as microorganisms, plants, and animals; and toxicity tests to investigate the effects of harmful substances present in the soil on plants and animals.

[0054] In addition, the soil separation step (S20) of the present invention may be a step of separating and moving the normal layer soil being removed while drilling to the depth of the normal layer that was previously measured and analyzed, and then separating and moving the contaminated soil being removed while drilling to the depth of the contaminated soil to a purification location.

[0055] As shown in the attached drawing Fig. 4, the soil separation step (S20) of the present invention is such that, in the process of inserting the casing while drilling to the depth of the normal layer by the drilling drive unit (11) of the auger crane (10) rotating and lowering the drilling drill (12) and the casing (1), the normal soil of the normal layer is expelled to the outside (drilling and expelling by the repeated forward / reverse rotation of the drilling drill), and the expelled normal soil is collected and stored.

[0056] Subsequently, as shown in the attached drawing Fig. 5, the drilling drive unit (11) of the auger crane (10) rotates the drilling drill (12) and the casing (1) in a forward and downward motion, and when the casing is inserted while drilling to the depth of the contaminated layer, the contaminated soil of the contaminated layer is discharged to the outside during this process. At this time, the discharged contaminated soil is collected and transported to a purification location to perform purification treatment.

[0057] On the other hand, the residual contaminated soil purification step (S40) included in the next step after the soil separation step (S20) of the present invention may be a step in which a purification agent introduced along the inner diameter of the non-porous casing (1') penetrates into the contaminated soil remaining between each casing (1; actually, perforated casing (1)) through the perforated portion of the perforated casing (1") and performs a purification action, as shown in FIG. 6 of the attached drawings.

[0058] In the residual contaminated soil purification step (S40) of the present invention, when a purification agent such as a heavy metal stabilizer is injected along the inner diameter of the casing (1) inserted in the normal layer and the contaminated layer where the contaminated soil is distributed, the purification agent flows down through the non-porous casing (1') located in the normal layer and then down to the perforated casing (1") located in the contaminated layer. As shown in FIG. 7 of the attached drawings, the purification agent flowing down is discharged through the countless perforations of the perforated casing (1") and penetrates or infiltrates into the residual contaminated soil between the perforated casings (1") inserted in a honeycomb shape, thereby causing a purification action to occur.

[0059] At this time, the residual contaminated soil purification step (S40) of the present invention, although not illustrated, may be a step in which a purification agent sprayed or discharged when a lifting means introduced into the inner diameter of the casing (1) is positioned at the perforated portion of the perforated casing (1) penetrates or infiltrates the contaminated soil remaining between each casing to perform a purification action.

[0060] For example, the above lifting means may be a drilling drill (12) of the auger crane (10) that performs a drilling operation for casing insertion, and a purification agent supplied from a purification agent supply unit (not shown) provided on the ground may be sprayed or discharged through a chemical injection path (pipe) formed inside the drilling drill (12) and a spray nozzle (embedded inside the outer diameter) provided on the outer diameter of the drilling drill (12).

[0061] The drilling drill (12), which is the lifting means of the present invention, can supply the purification agent using the drilling drill (12) itself without having a separate device for spraying the purification agent, thereby making it possible to immediately inject the purification agent without dismantling or separating the drilling drill (12) from the drilling drive unit (11), and thereby shorten the preparation work for purifying residual contaminated soil.

[0062] In addition, by spraying or discharging the purification agent at high pressure in the direction of the perforated portion of the perforated casing (1), the penetration or invasiveness of the purification agent into the residual contaminated soil can be increased, thereby promoting the purification action.

[0063] At this time, as another example of the lifting means, the purification agent supplied from the purification agent supply unit (not shown) provided on the ground may be sprayed or discharged through a separate lifting body (not shown) that moves up and down inside the casing (1) by means of a lifting drive means (not shown) provided on the ground with a chemical injection path and a nozzle.

[0064] The separate lifting body, which is the lifting means of the present invention, is a dedicated device for purifying residual contaminated soil and is designed to accurately control the spraying or discharge operation of a purification agent on the perforated portion of the perforated casing (1) such that, that is, the amount of spraying or discharge of the purification agent, pressure, and time can be set and controlled, thereby enabling the accurate spraying or discharge operation of the purification agent to be performed automatically.

[0065] The purification agent of the present invention may be an oxidizing agent for oil, organic matter, etc., or a stabilizer for heavy metals, but is not necessarily limited thereto, and other purification agents may be applied depending on the components of the contaminated soil, such as heavy metals other than oil and organic matter, and the soil.

[0066] In this way, the present invention introduces a purification agent, such as an oxidizing agent or a heavy metal stabilizer, such as oil or organic matter, along the inner diameter of the casing (1) inserted into the normal layer and the contaminated layer in which the contaminated soil is distributed, and discharges it through the numerous perforations of the perforated casing (1) so that purification action occurs as it penetrates or infiltrates into the residual contaminated soil between the perforated casings (1) inserted in a honeycomb shape, as shown in Figures 8 a) and 8b) of the attached drawings, thereby changing the properties of the contaminated soil into purified soil.

[0067] Furthermore, the contaminated soil purification step (S40) of the present invention is a step of purifying the separated contaminated soil through a treatment device at the site or a remote location, and the purification treatment process may be a step of applying one or more technologies among a chemical treatment process that removes contaminants using an oxidizing agent, a physical treatment process that stabilizes contaminants using a stabilizer, and a biological treatment process that decomposes or removes contaminants using organisms such as microorganisms or plants present in the soil.

[0068] For reference, the order of the above-mentioned residual contaminated soil purification step (S40) and contaminated soil purification step (S40) is assigned for explanatory purposes, but the order of the above-mentioned residual contaminated soil purification step (S40) and contaminated soil purification step (S40) may be changed or may proceed simultaneously.

[0069] In addition, the soil restoration step (S50) of the present invention may be a step of mixing the normal layer soil and the purified soil, or filling each into the perforated area or the casing (1) inserted into the perforated area.

[0070] The above soil restoration step (S50) involves filling the perforated area with normal layer soil and purified soil, as in the existing method. ex-situ Since the method is not significantly different, a detailed explanation is omitted.

[0071] In addition, the present invention may further include a contaminated soil preliminary analysis step (S1) that measures and analyzes the depth and volume of an area where contaminated soil is located within a normal layer in advance, as shown in the attached drawing Fig. 9.

[0072] For example, the contaminated soil preliminary analysis step (S1) of the present invention may be a step in which a hyperspectral sensor mounted on a drone that remotely operates over an area requiring analysis collects hyperspectral images of the ground, a coordinate analysis algorithm or program performs coordinate transformation after surveying GCPs (Ground Reference Points) on the collected hyperspectral image information, and a contamination analysis algorithm or program generates a 3D image of the contaminated soil area within the normal layer based on the collected hyperspectral image information and coordinate information, while simultaneously analyzing the volume to provide contaminated area data.

[0073] In this invention, the hyperspectral sensor collects spectral information characteristics in the ultraviolet and infrared regions by subdividing the visible light and near-infrared wavelength bands into hundreds, and a digital camera captures RGB images.

[0074] At this time, the hyperspectral sensor may be a near-infrared (NIR) image sensor, an optical multispectral sensor, or a hyperspectral sensor, and the near-infrared (NIR) image sensor may capture spectral images above the shooting area such that the spectral reflectance of the 600 nm to 900 nm wavelength range or the Red wavelength range and the NIR wavelength range, the optical multispectral sensor may capture spectral reflectance of the 400 nm to 500 nm wavelength range and the 600 nm to 700 nm wavelength range or the Blue and Red wavelength ranges, and the hyperspectral sensor may capture spectral images such that the spectral reflectance of the 400 nm to 600 nm and 650 nm to 750 nm wavelength ranges.

[0075] As described above, when image data is transmitted in set area units by capturing images with a hyperspectral sensor and a digital camera mounted on the drone, a contamination analysis algorithm or program analyzes the difference in characteristics, including spectral reflectance, between contaminated soil and normal soil, and analyzes the area and depth of the contaminated soil.

[0076] Subsequently, the above-mentioned contamination analysis algorithm or program displays the location, area, and depth of contaminated soil in the normal layer as point cloud data in a three-dimensional space using numerous 'points' including colors and coordinate values. The cloud data is based on the concept of SFM (Structure From Motion), which expresses the feature points of a two-dimensional photograph in a 3D space by triangulating them.

[0077] Next, based on the point cloud generated as described above, the contamination analysis algorithm or program generates 3D mesh data regarding the location, area, and depth of the contaminated soil. The 3D mesh is displayed in a shape resembling a net cast on the surface of the mapping target, and while the aforementioned point cloud consists of 'points', the 3D mesh is in the form of a set of triangular faces created by connecting those points.

[0078] At this time, the contamination analysis algorithm or program expresses a texture in the 3D mesh data to generate a sophisticated 3D image. To do this, a texture is extracted based on the color (RGB value) of the actual video (original video) captured by the drone, and the extracted texture information is superimposed on the mesh data to generate a realistic 3D image.

[0079] Subsequently, the volume calculation means of the pollution analysis algorithm or program calculates the scale of the contaminated soil area from the 3D image data, predicts and calculates the height of the contaminated soil by applying the average height of the surrounding normal layer to the contaminated soil area, generates a 3D image of the contaminated soil area, divides the three-dimensional 3D image of the contaminated soil area into a plurality of vertical slits, calculates and sums the vertical cross-sectional areas by numerically analyzing the actual distances of the ends of each slit, and calculates, stores, and provides the volume of the contaminated soil area.

[0080] At this time, the 3D image of the contaminated soil area has coordinate values ​​according to the depth and area in which the contaminated soil is distributed within the normal layer, and according to these coordinate values, the position and depth of the drilling drill (12) and the position and depth of the casing (1) are accurately identified so that drilling and casing insertion are performed at the corresponding position, and the arrangement or connection order of the non-porous casing (1') and the perforated casing (1") can be determined in advance according to the depth of the normal layer and the depth of the contaminated soil.

[0081] That is, the contaminated soil preliminary analysis step (S1) of the present invention may further include a drilling and soil removal and casing preliminary preparation step, which specifies the drilling area in a honeycomb shape according to the area and depth of the analyzed contaminated soil area through a drilling and soil removal and casing insertion algorithm or program, and calculates the drilling depth and the arrangement of the casing (1) when the drilling drill (12) drills and inserts the casing (1) for each drilling area.

[0082] At this time, the arrangement of the casing (1) of the present invention may be a sequential arrangement of the non-porous casing (1') and the perforated casing (1") according to the depth of the normal layer soil and the contaminated soil.

[0083] In this way, the present invention, through a contaminated soil preliminary analysis step (S1), measures and analyzes the depth and volume of the area where contaminated soil is located within the normal layer in advance and provides a 3D image with three-dimensional coordinate values, thereby enabling accurate and precise drilling, soil removal, and casing insertion in the area where contaminated soil is located, thereby increasing the accuracy and efficiency of contaminated soil collection.

[0084] In this case, for the preliminary measurement analysis of the contaminated soil, it is also possible to insert sampling tubes into various parts of the stratum where contaminated soil is expected to measure the presence of contamination, the contaminated area, and the contamination depth of each part, and then collect and analyze the data to use as data for drilling and casing.

[0085] In the present invention as described above, when the casing (1) is densely arranged in a honeycomb shape over a contaminated soil area, a separate small pipe may be inserted to inject a purification agent into the contaminated soil portion (unexcavated portion) remaining in the area between the casings (1), and in this case, the casing (1) is applied as a non-porous casing.

[0087] The technical features disclosed in each embodiment of the present invention are not limited to that embodiment only, and as long as they are not mutually incompatible, the technical features disclosed in each embodiment may be combined and applied to different embodiments.

[0088] Therefore, in each embodiment, the technical features are described primarily, but as long as the technical features are not mutually incompatible, they may be combined and applied together.

[0089] The present invention is not limited to the embodiments described above and the attached drawings, and various modifications and variations may be possible from the perspective of those skilled in the art to which the present invention belongs. Accordingly, the scope of the present invention should be defined not only by the claims of this specification but also by equivalents thereof. Explanation of the symbols

[0091] 10: Auger crane 11: Drilling drive unit 12: Drilling 1: Casing 1': Non-holed casing 1": Perforated casing

Claims

Claim 1 A method for purifying contaminated soil located at a deep depth below the normal layer and on the ground surface of an area containing above-ground structures, comprising: a casing insertion step of inserting casings while densely vertically drilling and excavating soil in a honeycomb shape over an area previously measured and analyzed as the location of the contaminated soil, and arranging and installing perforated casings so that they are positioned at the depth where the contaminated soil is located; a soil separation step of separating and moving the normal layer soil excavated while drilling to the depth of the normal layer previously measured and analyzed, and then separating and moving the contaminated soil excavated while drilling to the depth of the contaminated soil to a purification location; a contaminated soil purification step of purifying the separated contaminated soil through a predetermined purification treatment process; a residual contaminated soil purification step of supplying purification chemicals into the interior of the casings while the plurality of casings are inserted into the ground; and a soil restoration step of filling the drilled area with the normal layer soil and purified soil while the casings are inserted. A method for purifying contaminated soil through the installation of multiple casings, comprising: a preliminary measurement analysis of the contaminated soil, wherein a sample collection tube is inserted into several parts of a stratum where contaminated soil is expected, and the presence of contamination, the contaminated area, and the depth of contamination of each part are measured and analyzed to be used as data for drilling and casing; wherein the casing insertion step allows unexcavated residual contaminated soil to remain in the outer area between adjacent casings while the plurality of casings are inserted into the ground; and wherein the residual contaminated soil purification step allows a purification agent passing through the perforated part of the perforated casing to infiltrate or penetrate into the residual contaminated soil remaining in the area between the adjacent casings. Claim 2 A method for purifying contaminated soil through the installation of multiple casings according to claim 1, wherein the casing insertion step comprises sequentially applying a perforated casing to be positioned in the contaminated soil and a non-perforated casing to be positioned in the normal layer according to the depth of the contaminated soil area, thereby enabling stepwise perforation, soil removal, and casing insertion. Claim 3 A method for purifying contaminated soil through the installation of multiple casings according to claim 1, wherein the casing insertion step is a step in which the soil is drilled and removed by a multi-stage drilling drill that is vertically arranged and coupled to the drilling drive part of an auger crane, and a multi-stage casing arranged and coupled to surround the drilling drill is inserted into the drilled area simultaneously with the drilling. Claim 4 In paragraph 3, the casing insertion step is a method for purifying contaminated soil through the installation of multiple casings, wherein drilling and soil removal and casing insertion are performed by a drilling drill and casing installed as a single unit in the drilling drive part of the auger crane. Claim 5 In paragraph 3, the casing insertion step is a method for purifying contaminated soil through the installation of multiple casings, wherein drilling and soil removal and casing insertion are performed simultaneously by a plurality of drilling drills and casings installed in a multi-axis manner in the drilling drive unit of the auger crane. Claim 6 In claim 5, the above multi-axis is a method for purifying contaminated soil through the installation of multiple casings in which a plurality of drilling drills and casings are arranged in a single row. Claim 7 In paragraph 5, the above multi-axis is a method for purifying contaminated soil through the installation of multiple casings in which a plurality of drilling drills and casings are arranged in a square shape including a triangle or a rhombus. Claim 8 A method for purifying contaminated soil through the installation of multiple casings according to claim 1, comprising a casing arrangement and combination step prior to the casing insertion step, wherein a non-porous casing and a perforated casing are arranged and combined according to the depth of the normal layer and the contaminated soil area measured and analyzed in advance. Claim 9 In claim 1, the residual contaminated soil purification step is a method for purifying contaminated soil through the installation of multiple casings, wherein a purification agent injected along the inner diameter of the casing penetrates into the contaminated soil remaining between each casing through the perforations of the perforated casing to perform a purification action. Claim 10 In claim 1, the residual contaminated soil purification step is a method for purifying contaminated soil through the installation of multiple casings, wherein when a lifting means introduced into the inner diameter of the casing is positioned at the perforated portion of the perforated casing, a purification agent sprayed or discharged penetrates or infiltrates the contaminated soil remaining between each casing to perform a purification action. Claim 11 In claim 10, the lifting means is a drilling drill of an auger crane that performs a drilling operation for casing insertion, and a method for purifying contaminated soil through the installation of multiple casings that sprays or discharges a purification chemical supplied from a purification chemical supply unit provided on the ground through a chemical injection path formed inside the drilling drill and a nozzle provided on the outer diameter of the drilling drill. Claim 12 In claim 10, the lifting means is a separate lifting body that moves up and down inside the casing by means of a lifting drive means provided on the ground with a chemical injection path and a nozzle, and a method for purifying contaminated soil through the installation of multiple casings that spray or discharge a purification chemical supplied from a purification chemical supply unit provided on the ground. Claim 13 In claim 1, the soil restoration step is a method for purifying contaminated soil through the installation of multiple casings, wherein the normal layer soil and the purified soil are mixed or each is filled into a perforated area or a casing inserted into a perforated area.

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