KR20180009948A - Agitating apparatus and hybrid type soil washing method for in-situ complexly contaminated soil using Agitating apparatus - Google Patents

Abstract

The present invention relates to an in-situ agitating device, and more specifically, the in-situ agitating device comprises: a driving means; a penetration pipe having a gas inlet formed at a lower portion thereof; a mounting tube orthogonal to an end of the penetration pipe and having a plurality of injection holes formed at upper and lower ends thereof; a rotating body having a pair of rotating shafts rotating at both ends of the mounting tube by receiving rotational force from the driving means; and a stirring blade including a first rotating blade and a second rotating blade, wherein the first rotating blade and the second rotating blade are coupled to the rotating shaft and have a plurality of spikes on the outer surface thereof.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an in-situ agitating apparatus and an in-situ complexly contaminated soil-

The present invention is based on the in-situ agitation in the purification of complex contaminated soil and the like so as to increase the purification efficiency by enlarging the area of the chemical solution input by the homogenization of the soil and the expansion of the pores and to uniformly carry out treatment of oil and heavy metals at the same time The present invention also relates to a hybrid mixing apparatus and a hybrid purification method for hybrid contaminated soil, which can prevent secondary contamination by controlling the introduction of contaminants together with a chemical solution and the like outside the purification zone during the purification process.

In recent years, the importance of soil environment, which is affected by development projects due to the increase of seriousness of soil and groundwater pollution due to waste and harmful chemical substances generated by population growth and industrial development, is emerging.

Especially, as the economic development and the income level have improved, the oil usage due to the supply of automobiles has greatly increased along with industrial activities. Accordingly, pollution of soil and groundwater due to leakage of oil and harmful chemicals classified as non-aqueous liquid (NAPLs) in oil storage tanks of petrol stations and underground storage tanks of industrial facilities storing chemical substances are highlighted.

In addition, as a factor of soil pollution, heavy metals include lead, arsenic cadmium with positive charge and arsenic with negative charge. Since the 2000s, heavy metal contaminated soils in industrial parks and abandoned mines have been continuously raised, and the purification of heavy metal contaminated soils has become a new field. Soils contaminated with heavy metals have no odor or color change and can not be visually confirmed. Most of the contaminated soil remediation projects in Korea are conducted mainly on oil contaminated soil, and only a few of heavy metal contaminated soil remediation projects are carried out.

On the other hand, considering the specificity and pollution characteristics of industrial complexes due to landfill waste in complex polluted sites, the industrial complex constructed by the state and local governments buried in the industrial complexes was changed to slag, Waste scraps, etc. are recycled as landfill materials and landfilled in industrial complexes, or surface wastes such as zinc, nickel, lead, copper, heavy metal pollutants such as fluorine, arsenic, fluorine and arsenic Contaminants are complex and are investigated for a variety of reasons.

In particular, the industrial complexes that are recycled by recycling the waste are diversified by the factories that are using the sites to produce them. Therefore, it is very difficult to identify and identify the causes of the industrial pollution caused by the existing landfilled waste and industrial activities have.

In general, heavy metal pollution, which is a pH neutral soil, is characterized by contamination from contamination due to scattering by scattering, and vertical diffusion is difficult. However, the mixed contaminated soil of the industrial complex constructed with the landfill is contaminated to the depth of the depth of the contaminated depth, the tendency of the diffusion of pollution is irregular, and the contamination concentration is also heterogeneous. In the case of the factories that are being produced in the complex contaminated site, it is very difficult to excavate the contaminated soil, and purification of the underground pollutants in the facilities that can not be excavated is very difficult or the technical application is limited.

In this regard, Korean Patent Registration No. 10-0998969 discloses a device for installing drilling holes at required positions of a contaminated soil layer, drilling a borehole to a depth to be cleaned by driving the drilling hole drilling device, and injecting a high-pressure chemical solution And injecting the ultra-high pressure chemical solution into the perforated borehole where the contamination occurs.

However, in this technology, the chemical solution is injected at ultra-high pressure so as to transfer the chemical solution between the gaps of the soil. When the chemical solution is injected at such a high pressure, channeling occurs and the chemical solution is not uniformly dispersed, .

Korean Patent Registration No. 10-0909082 also discloses a structure for injecting a fermentation broth into a soil contaminated with heavy metals at a high pressure. A boring machine equipped with a rod equipped with a spray nozzle is drilled to a desired depth, The fermentation liquid is injected by rotating the rod at a predetermined speed while spraying. In the case of the present technology, the fermentation liquid is injected into the pores of the agitated soil while simultaneously stirring the soil and injecting the fermentation liquid. However, in the application of the present technology, when the sprayed fermentation liquid flows horizontally in the agitated soil, there is a problem that secondary contamination may occur due to other contaminants entering into the purified purification zone together with the fermentation broth.

Korean Patent Registration No. 10-0998969 Korean Patent Registration No. 10-0909082

Accordingly, the present invention has been devised to solve the above-mentioned problems, and it is an object of the present invention to provide a method for selectively removing a soil in an excavation and agitation, The present invention has been made in view of the above problems, and it is an object of the present invention to provide an in-situ agitation mixing apparatus capable of improving the agitation efficiency by three-dimensional movement of the front and back sides of the soil.

In addition, it is possible to treat oil and heavy metals at the same time, so that it can be applied to a complex contaminated soil, the chemical solution can be uniformly transferred to the contaminated soil to improve the purification efficiency, and the contamination can be controlled Thereby preventing secondary contamination, and a hybrid purification method for a hybrid contaminated soil using the same.

To achieve the above object, the in-situ agitation mixing apparatus of the present invention (hereinafter referred to as " agitation mixing apparatus of the present invention ") comprises driving means; A tube having a gas suction part formed at a lower portion thereof; A mounting tube having a plurality of injection holes for injecting the chemical solution into the soil which is orthogonal and agitated at the end of the tube inlet; A rotating body having a pair of rotating shafts rotating at both ends of the mounting tube by receiving a rotating force from the driving unit; And a stirring blade including a first rotating blade and a second rotating blade each of which is composed of a curved surface and in which the first rotating blade and the second rotating blade are coupled to and engaged with the respective rotating shafts and have a plurality of spikes .

As an example, there is further provided an excavating plate having protruding portions at one end and a tapered shape, the excavating plate being coupled to the rotating shaft, the excavating plate being mounted at a rotation radius end of the stirring vane at a direction orthogonal to the rotating shaft, And a stopper passing through one end or the other end of the excavating plate and allowing the excavating plate to be rotatable, and a stopper for limiting a rotation range of the excavating plate.

As an example, the stirring wing control device further includes a control body coupled to the rotation shaft; And a stirring vane shaft coupled to the control body, the stirring vane shaft being disposed perpendicularly to the rotation shaft and coupled to the stirring vane at an end thereof.

In addition, the stirring vane shaft may include: a first vane shaft coupled with the first rotating vane; And a second wing shaft coupled with the second wing shaft, wherein the control body separates the first wing shaft and the second wing shaft so as to individually control rotation of the first wing axis and the second wing axis .

In one embodiment, the control body is configured to adjust the distance between the first wing axis and the second wing axis.

For example, the control body may be guided by the rotation shaft so as to be conveyed to one side or the other side of the rotation shaft.

Meanwhile, the hybrid purification method using the in-situ mixed contaminated soil agitation using the in-situ agitation mixing apparatus of the present invention (hereinafter referred to as " purification method of the present invention "), in-situ underground stirring; Adding a chemical solution containing hydrogen peroxide, persulfate and organic acid to the stirred soil; Extracting contaminants generated by reaction with the chemical liquid; And injecting a soil conditioner containing calcium oxide into the agitated soil.

As an example, the chemical liquid may contain 5 to 10 parts by weight of hydrogen peroxide, 5 to 10 parts by weight of persulfate, 5 to 10 parts by weight of organic acid, calcium oxide and aluminum powder mixture of 1 to 3 parts by weight based on 100 parts by weight of electrolytic water produced using a potassium chloride electrolyte. And 0.5 to 2 parts by weight of tannin-containing plant extract.

As one example, the soil conditioner may be added in an amount of 10 to 20 parts by weight of silica, 5 to 10 parts by weight of scoria, 5 to 10 parts by weight of aluminum powder, 1 to 3 parts by weight of sodium hydroxide, 1 to 3 parts by weight of polycarboxylic acid- , And 0.5 to 2 parts by weight of coconut fiber in a short fiber form.

The stirring and mixing apparatus of the present invention can be selectively applied according to the ground environment such as hard sandy ground, sandy or gravel ground having a relatively large N value as well as the cohesive sole having a small pore size. In the excavation and stirring, There is an advantage in that the stirring efficiency can be improved by ensuring sufficient air gap by the movement of the rotor.

In addition, the stirring / mixing apparatus of the present invention allows the in-situ stirring of the contaminated soil to be carried out prior to / simultaneously with the introduction of the chemical liquid so that the chemical liquid is uniformly delivered in the contaminated soil by uniforming the soil and enlarging the pores, There is an advantage of providing an appropriate purification method for a complex contaminated soil showing irregularity of pollution.

In addition, the purification method of the present invention can improve applicability by uniformly delivering the chemical solution without channeling due to the fact that the in-situ stirring of the contaminated soil precedes / simultaneous with the fine soil such as clay having a low coefficient of permeability And can remove oil and heavy metals from polluted soil at the same time.

In addition, the purification method of the present invention is advantageous in that purification and remediation are hybridized by reinforcing contaminated soil by softening contaminated soil as well as stirring.

1 is a perspective view showing a stirring and mixing apparatus of the present invention.
FIG. 2A is a front view showing a stirring wing according to an embodiment of the present invention; FIG.
Fig. 2b is a front view showing a stirring wing according to another embodiment of the present invention; Fig.
FIG. 3A and FIG. 3B are diagrams showing an embodiment of a stirring blade control device that is a constitution of the present invention. FIG.
4A and 4B are views showing another embodiment of a stirring blade control device which is an embodiment of the present invention.
5 is a view for explaining the operating state of the home-position stirring / mixing apparatus of the present invention.
6 is a block diagram showing the purification method of the present invention.

In describing the present invention, terms and words used in the present specification and claims are to be construed in accordance with the principles of the present invention, on the basis that the inventor can properly define the concept of a term in order to best explain his invention It should be construed as meaning and concept consistent with the technical idea of.

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

1 and the like, the stirring and mixing apparatus 10 of the present invention includes driving means, a tube 100, a mounting tube 120, a rotating body 100, and a stirring blade 140.

The driving means imparts a driving force to each constitution of the stirring and mixing apparatus of the present invention. The driving means includes a rotation driving device 20 for rotating the rotating shaft 101 and an air injecting device 30 A chemical liquid injector 40 for injecting a chemical liquid, and a control unit (not shown) for controlling the liquid injector 40 and the chemical liquid injector 40 separately or interlinked.

A gas suction unit 160 is formed at a lower portion of the tube inlet pipe 110. The mounting pipe 120 is orthogonal to the end of the tube inlet pipe 110 and has a plurality of injection holes 130 at upper and lower ends thereof. Respectively. The pipe 110 and the pipe 120 together with the rotating body 100 are located in the ground during excavation and stirring to suck gas or inject a chemical solution or the like into the agitated soil.

The tube inlet pipe 110 is connected to a rotation driving device 20 which is not shown in the figure but which is driven by a driving motor to apply a rotational force to the stirring vane 140, Closing valve of the air injecting apparatus 30 is turned on by connecting the air injecting apparatus 30 and the opening and closing valve so that the air is injected into the injection hole 120 of the mounting tube 120 130 in the upward and downward directions.

For this, the air injection device 30 is connected to an air injection line inside the tube 110 and the mounting tube 120 so that air is injected through the injection hole 130 .

5, the chemical liquid injector 40 is further connected to the rotation driving device 20 by an on-off valve so that the on / off valve of the chemical liquid injector 40 is turned on, The chemical liquid can be injected into the contaminated soil which is stirred through the injection hole 130 of the mounting tube 120. [

Meanwhile, the rotating body 100 is provided with a pair of rotating shafts 101 which are rotated at both ends of the mounting tube 120 by receiving the rotating force from the driving means.

The stirring blade 140 includes a first rotating blade 142 and a second rotating blade 143 which are curved surfaces and the first rotating blade 142 and the second rotating blade 143 And a plurality of spikes 141 are mounted on the outer surface of the shaft 143.

With the shape of the stirring vanes 140, it is possible to control the agitation and mixing action of the soil as well as the flow of the agitated soil.

That is, when the stirring vane 140 has a shape that is directed outward from the inside of the rotating body 100 as shown in FIG. 2A, the soil s flows outwardly, and as shown in FIG. 2B When the stirring vanes 140 are inwardly directed from the outside of the rotating body 100, the soil s is stirred to form a flow in the inside direction.

5, the stirring vanes 140 are preferably arranged so that the soil s is not the outer side so as to prevent the horizontal flow of the gas g generated when the soil s is stirred, It is proper to form a flow in the inside direction.

The stirring vane 140 according to an embodiment of the present invention is configured such that the stirring vanes 140 are disposed at mutually opposite positions on the respective rotation shafts 141 by the first rotary vane 142 and the second rotary vane 143, The first rotary blade 142 is configured to be directed outwardly from the inside of the rotary body 100 and the second rotary blade 143 is configured to be directed inward from the outer side of the rotary body 100, The wings 142 and 143 perform the continuous rotation so that the soil s can form a bidirectional flow inward and outward, that is, in the lateral direction.

In this case, both right and left bi-directional agitation are performed simultaneously with forward and backward bi-directional agitation in accordance with the rotational direction of the stirring vane (100). By providing three-dimensional agitating performance, even in a cohesive sole having a small pore size and relatively low coefficient of permeability, It is possible to secure a sufficient air gap to be injected into the space.

The stirring blade 140 may be detachably attached to the stirring blade 140. The stirring blade 140 may be detachably attached to the stirring blade 140 to selectively orient the stirring blade 140 in consideration of the environment of the contaminated soil to be applied Applicability is reasonable.

When air is injected through the injection hole 130 in the flow of the soil s according to the shape of the stirring vane 140 described above, the injection hole 130 is formed in the upper and lower ends of the mounting tube 120, So that the agitated soil s and the air a collide with each other and the high volatile oil contained in the soil s by the collision is volatilized and the gas g).

The stirring blade control device 190 may further include a stirring blade control device 190. The stirring blade control device 190 may control the rotation of the stirring blade 140 such that the stirring blade control device 190 So that the position and angle of the stirring vane 140 can be adjusted without detaching and attaching to the stirring vane 140 having a considerable load, thereby improving the working efficiency.

Hereinafter, various embodiments of the stirring wing control device 190, which is an embodiment of the present invention, will be described in more detail with reference to Figs.

The stirring blade control device 190 includes a control main body 191 and a stirring blade shaft 192. The control main body 191 is coupled to the rotating shaft 101, The stirring member 192 is coupled to the control body 191 and is disposed perpendicularly to the rotation shaft 101, and the stirring vane 140 is coupled to an end thereof.

At this time, at least one reinforcing member 194 can be coupled between the stirring vane 140 and the stirring vane shaft 192. The reinforcing member 194 is disposed along the inner periphery of the curved stirring vane 140 So that rigidity is imparted to the stirring vane 140 when the mixed contaminated soil is agitated, so that the durability of the apparatus can be improved.

The stirring vane shaft 192 includes a first vane shaft 192a coupled to the first rotary vane 142 and a second vane shaft 192b coupled to the second rotary vane 143, The first wing axis 192a and the second rotation wing 143 are separated from each other so that the control body 191 is configured to individually control the rotation of the first wing axis 192a and the second rotation wing 143 do.

The first rotary vane 142 and the second rotary vane 143 are rotatable about the stirring vane shaft 192 so that the rotary vanes 142 and 143 are controlled by the control body 191 It is possible to freely control the rotation body 100 from the inside to the outside of the rotation body 100 or from the outside to the inside of the rotation body 100 in the opposite direction. Therefore, without detaching the rotation blades 142 and 143, It is possible to easily control the flow of the soil s to be directed to the outer side (see FIG. 3A) and the inner side (see FIG. 3B) at the time of stirring and mixing, as shown in FIG.

Hereinafter, another embodiment of the stirring blade control device 190 will be described with reference to FIG.

First, as shown in FIG. 4A, the control body may control the rotation radius of the rotary vane 140 by adjusting the interval between the first vane axis 192a and the second vane axis 192b. It is possible to reduce the construction time by increasing the turning radius of the rotary vane 140 in the case of the clay soil having a relatively small N value according to the constituents of the contaminated soil to be applied to the construction by controlling the rotation radius of the rotary vane 140, It is possible to control the durability of the apparatus because the rotation radius of the rotary vane 140 is reduced in the case of the dense sandy ground to the sandy gravel ground having a large N value.

4B shows another embodiment of the stirring blade control device 190. As shown in the figure, the control main body 191 is guided by the rotation shaft 101 to rotate to one side or the other side of the rotation shaft 101 Indicates that it is configured to be transportable.

As described above, the control main body 191 is configured to be transported to both sides on the rotation shaft 101, so that contaminated soil in a larger area can be agitated and mixed based on the rotating main body 100 Thereby making it possible to double the construction time, stirring and mixing efficiency.

According to the present invention, as described above, the stirring vane 140 is configured so that the soil s flows in the inner direction or flows in both the inner and outer directions, and the structure of the stirring vane 140 stirs the soil At the same time, the function of the shielding membrane is to prevent the injected air (a) and gas (g) from forming a horizontal flow outside the purifying soil of interest.

The gas g collected inside the stirring vane 140 is sucked through the gas suction unit 160 formed in the inlet pipe 110 and discharged to the outside.

That is, when the gas g collected in the stirring vane 140 is not directly sucked, the gas g is guided upward by the specific gravity, and horizontal flow occurs by channeling or the like, The gas g is collected in the inward direction according to the flow action of the stirring vane 140 to prevent the gas g from being drawn out to the outside.

For this, the gas suction unit 160 may be formed at a position slightly spaced upward from the stirring vane 140. Although not shown in the drawing, the gas (g) sucked through the gas suction unit 160 is discharged to the filtration facility such as an activated carbon adsorption tower through the gas discharge line in the pipe inlet pipe 110 through the driving means .

The stirring vanes 140 coupled to the respective rotating shafts 101 are preferably disposed so as to face outwardly from the inside of the rotating main body 100. In particular, When two sludge are formed, they are symmetrical so that the agitated soil (s) flows into the internal space according to the flow formed by both the stirring blades (142, 143).

In addition, the air injected through the injection hole 130 is introduced into the inner space formed by both the stirring blades 142 and 143 so that the agitated soil s and the injected air a are supplied to the two stirring blades 142 , And 143, respectively. In this process, the high-volatile oil flows upward in the internal space formed by both stirring blades 142 and 143 by the pores of the agitated soil, wherein the flow of gas and the injected air are transmitted to both stirring vanes 142 And 143 are prevented from being guided to the outside of the inner space by the shield formed by the shields.

As shown in FIG. 1 and the like, the stirring and mixing apparatus 10 according to an embodiment of the present invention is capable of excavating and stirring even in a dense sandy ground, sandy or gravel ground having a relatively larger N value than a general clayey soil And may further comprise a digging plate (150).

Here, the 'N value' is an index indicating the relative value of the hardness and compaction degree of the ground. It is defined as the number of hammer blows required to penetrate 30 cm of the sampler in the standard penetration test. Values are usually used as the most common data for design or construction.

The excavating plate 150 has a protruding portion 151 having a pointed shape at one end and the other end and is coupled to the rotating shaft 101. The excavating plate 150 rotates at an end of the rotating radius of the stirring vane 140, Direction.

That is, the digging plate 150 is installed at the same position as the rotation radius of the stirring vane 140, and the protrusion 151 is installed in a direction perpendicular to the rotation axis 101, The rigid ground is excavated by the protruding portion 151 while rotating together with the stirring vane 140. The operation of the continuous stirring vane 140 and the excavating plate 150 enables simultaneous excavation and stirring .

According to an embodiment of the present invention, the excavation plate 150 is preferably of a position control type rather than a fixed type in order to minimize a load in a continuous excavation process.

1, a pivot pin 170, which passes through one end or the other end of the excavation plate 150 from the center of the excavation plate 150 and allows the excavation plate 150 to pivot, And a stopper 180 for restricting the range of rotation of the motor.

In accordance with the rotation of the rotary shaft 101, the excavating plate 150 rotates in conjunction with the rotation of the rotary shaft 101. When the rotary pin is rotated from the upper position to the lower position in the rotation path, The excavating plate 150 is rotated in the direction of one end or the other end of which the center is large. The position of the excavating plate 150 is limited at a predetermined position by the stopper 180. The stopper 180 is set in a direction orthogonal to the axial direction of the rotating shaft 101 .

Therefore, the excavation plate 150 can vertically move the excavation plate 150 while keeping its vertical position by the center of gravity at the moment of contact with the ground, and can be rotated in response to the movement of the soil in the ground, ) Is minimized in the excavation process, and at the position outside the ground, it can be rotated and returned to the center of gravity.

According to the construction of the excavation plate 150, the in-place stirring / mixing apparatus 10 of the present invention can excavate the excavation plate more than the limit depth in the case of using a conventional stirring excavator, and further reduce the excavation time .

In addition, it can be confirmed that excavation work can be smoothly performed in a hard sandy ground, sandy gravel, or the like, having an N value of not less than 30 as well as a general clayey soil due to excavation of the excavation plate 150.

As shown in FIG. 6, the purifying method of the present invention may include: (S10) performing in-situ underground stirring of the contaminated soil to a planned depth using the in-situ stirring mixer; (S20) injecting a chemical solution containing hydrogen peroxide, persulfate and organic acid into the stirred soil; A step S30 of extracting contaminants generated by reaction with the chemical liquid; (S40) injecting a soil conditioner containing calcium oxide into the agitated soil.

First, the present invention has a step (S10) of performing in-situ underground stirring with respect to the contaminated soil by using the above-described in-situ stirring mixer of the present invention. In carrying out the in-situ underground agitation in the contaminated soil, the agitation is performed through the movement of the three-dimensional soil in the forward, backward, and leftward directions according to the shape of the agitating blades, thereby uniformizing the soil and increasing the pore will be.

In-situ underground agitation is performed in areas where the depth of contamination, such as waste landfill sites, or areas where digestion is difficult, or where chemical fluids are difficult to transport due to fine clay, such as clay, Thereby enabling delivery of the chemical solution to the region.

And then injecting the chemical solution into the agitated soil (S20).

In this step S20, the chemical solution is transferred from the contaminated soil to the wide area by injecting the chemical solution into the contaminated soil having a large pore size, which is stirred and homogenized by the process performed at the same time as the step (S10) or after the step (S10) To react with the substance.

In this case, in the case of injecting the chemical liquid, since the state is equalized by stirring in the previous step (S10) and the pore is enlarged, there is no need to inject at a high pressure as in the conventional high pressure injection method (FRACTUREING) Can be prevented.

Herein, the chemical solution includes hydrogen peroxide, persulfate, and organic acid. In the present invention, one embodiment of a chemical solution is provided to simultaneously purify oil and heavy metals in a complex contaminated soil.

5 to 10 parts by weight of hydrogen peroxide, 5 to 10 parts by weight of persulfate, 5 to 10 parts by weight of organic acid, 1 to 3 parts by weight of calcium oxide and aluminum powder mixture And 0.5 to 2 parts by weight of a tannin-containing plant extract.

First, electrolytic water produced by using a potassium chloride electrolyte is used. The electrolytic water defines the acidic water generated in the anode and the alkaline water generated in the cathode as a result of electrolysis of water using an electrolyte, and the electrolytic water is oxidized and reduced The electrolytic water itself is used to decompose and separate contaminants from contaminated soil. That is, by using electrolytic water as a subject, the use amount of the chemical oxidizing agent can be reduced, and the occurrence of secondary pollution by the oxidizing agent can be controlled.

In particular, the electrolytic water used in the above-mentioned chemical liquid is one which is produced by using a potassium chloride electrolyte. This is because potassium acts as an inorganic substance for plant growth conditions as well as a fertilizer raw material in the soil after purification, It is for the modification of the soil.

The hydrogen peroxide is a compound of hydrogen and oxygen, and has a strong oxidizing power. The hydrogen peroxide dissociates partially from the aqueous solution to have a weak acidity. It is a strong oxidizing agent and at the same time has the function of a weak reducing agent. Hydrogen peroxide has the property of generating free radicals in the presence of neutral or acidic metal ions of low oxidation state. Oxidation process using hydrogen peroxide is a kind of Advanced Oxidation Process (AOP). When hydrogen peroxide is activated, OH radicals are generated and they are able to oxidize decomposable organic substances because they have very high redox potential.

And the persulfate is selected from the group consisting of sulfuric acid (H2SO4), perchloric acid (HClO4), hypochlorous acid (HClO), permanganic acid (HMnO4), chromic acid (H2CrO4), sodium hypochlorite (NaOCl), calcium hypochlorite ), Sodium persulfate (Na2S2O8), or potassium persulfate (K2S2O8), SO4 radicals having strong oxidizing power can be generated by light, metal, etc. in addition to heat, thereby oxidizing the oil.

The organic acid is preferably EDTA (Ethylenediamine Tetraacetic Acid). Since EDTA has high molecular weight and high solubility, EDTA can be easily removed after binding with heavy metals remaining in the soil. In particular, EDTA has a strong binding force with heavy metals compared to other organic acids, and the removal efficiency of heavy metals is high because of the high solubility of the resulting complexes.

In addition, calcium oxide and an aluminum powder mixture are further added to the chemical liquid, and it is proper that calcium oxide and aluminum powder are formed at a weight ratio of 5: 5 to form a mixture. The reaction heat is generated when the mixture of calcium oxide and aluminum powder is mixed with water (electrolytic water). This reaction heat doubles the oxidation, i.e., decomposition and separation reaction of contaminants in contaminated soil, such as electrolytic water and hydrogen peroxide. Thereby amplifying the oxidizing power of the SO 4 radical of the SO 4 radical. That is, calcium oxide and an aluminum powder mixture are further added to the chemical solution so that the oxidation efficiency of the pollutant is doubled even if a relatively small amount of oxidant is added. In order to further improve the filling property of the chemical liquid with the pores of the soil by the reaction heat .

Further, the chemical solution of this embodiment is further added with a tannin-containing plant extract to remove heavy metals. Organic acids may be added to remove heavy metals. However, when organic acids are used in an amount exceeding the above range, organic acids may be combined with other minerals and other minerals beneficial to the soil as well as heavy metals, thereby removing beneficial components from the soil. , The organic acid is contained in the above mixing range, and in addition, the tannin-containing plant extract is further blended. In the tannin-containing plant extract, tannin binds with heavy metal ions and is extracted to the outside of the soil in a post-process extraction step. In the case of the tannin-containing plant extract of the present embodiment, it is extracted from various plants by various known techniques. Is omitted.

In the soil agitated by the composition of the chemical liquid, a process of homogenously removing the heavy metals mainly by oxidation, mainly by adsorption, separation, etc., is performed by hybridization.

And then extracting the contaminants that have been reacted (S30).

The step S30 may include extracting the polluted material after completion of reaction after ensuring a sufficient reaction time after the chemical liquid is injected into the contaminated soil in the step S20.

In extracting the contaminants as described above, contaminants that have reacted with the chemical solution by homogenization of the soil and expansion of the pores are easily and uniformly extracted by stirring the contaminant soil in the step (S10). By this uniform extraction, The soil purification efficiency is increased.

In addition, even in the case of a relatively fine-grained soil in which the conventional extraction is not easy, the applicability of the extraction process can be expanded by expanding the pores through the stirring in the step S10.

Meanwhile, in the present invention, three examples are presented in the step S30 of extracting the contaminants after the reaction is completed, and the embodiments will be described below.

The first embodiment has a step of covering the hood to the contaminated soil so as to extract the reaction gas from the contaminated soil. Here, the hood is not shown in the drawing, but may be formed in various ways through known techniques. The hood is integrally formed with the in-situ stirring / mixing apparatus shown in Fig. 1 and the like, The waste gas generated by the chemical reaction may be discharged from the contaminated soil through the hood to the outside, and may be formed separately from the in-situ agitation mixing apparatus to enable the above-described operation.

In addition, when the hood is subjected to stirring and air injection at the same time in the contaminated soil using the in-place mixing / mixing device 10, volatile oil can be collected and extracted by air injection. In addition, although not shown in the drawings, an activated carbon adsorption tower may be further provided and a step of adsorption of volatile organic compounds (VOCS) may be further added.

Meanwhile, as a second embodiment, there is a step of extracting pollutants by penetrating the extraction tanks into the ground. Though not shown in the figure, the extracted pellets penetrate at least one extracted pellet into the contaminated soil after the reaction has been completed, and the pollutant reacted with the pellet through the pellet is absorbed and extracted to the outside.

To this end, a plurality of suction holes are formed in the extraction tab to suck the contaminants reacted with the chemical solution through the suction holes and extract them to the outside. In addition, although not shown in the drawings, in some cases, an injection well is further formed outside the extraction area, and water or steam is injected into the injection material to suck pollutants reacted with the chemical or the water together with steam or water, I can do it.

As a third embodiment, there is a step of electrically extracting contaminants by intrusion of electricity into the ground.

When an electric signal is applied by the penetration of the electric power, the contaminant in the ionic state reacted with the chemical solution generates electric current by the positive electrode and the negative electrode to extract the contaminant. In the case of this embodiment, it may be applied to a saturated soil having a low water permeability mainly composed of clay and other fine clay.

It is needless to say that the three embodiments mentioned above can be applied separately, and the embodiments can be applied in combination.

Finally, a soil improvement agent containing calcium oxide is injected into the agitated soil (S40). The soil which has been agitated in the previous stage and injected with the chemical solution and the reaction is completed is in a weak state as in the case of porridge. In this step (S40), soil improvement agent is added to the soil to improve the soil softer .

To this end, the present invention provides an example of a soil conditioner, wherein the soil conditioner of the present embodiment comprises 10 to 20 parts by weight of silica, 5 to 10 parts by weight of scoria, 5 to 10 parts by weight of aluminum powder, 1 to 3 parts by weight of sodium hydroxide, 1 to 3 parts by weight of a polycarboxylic acid-based admixture, and 0.5 to 2 parts by weight of coconut fiber in a short fiber form.

The calcium oxide reacts with water to form Ca (OH) 2 and reacts with SiO2 to form stable calcium silicate, thereby imparting stiffness to softened soil.

The silica has a deodorizing ability by porosity and reacts with Ca (OH) 2 to produce CaO-SiO2-nH2O, thereby imparting rigidity to the soil as a filler. The reason why the deodorizing ability is expressed by adding silica is to control the problem that the pH is increased as the oxidant or the like is used in the previous stage and the odor is generated afterwards due to the increase in pH.

In the case of the aluminum powder, similar to the silica, it has a deodorizing ability by porosity and reinforces the strength as a filler. Particularly, the reason why the aluminum powder is added is to increase the curing rate by causing the heat generation through the reaction between the calcium oxide and the sodium hydroxide. That is, early curing is carried out so as to enhance workability and early strength.

On the other hand, the continuous action of hydrogen peroxide and persulfate in the previous step causes the hydroxide radical (OH) to be continuously released into the water of the soil, thereby increasing the pH. Therefore, in the present invention, scoria powder is further added as a composition of the soil conditioner to prevent the generation of odor due to a rise in pH. The shape of the scoria shown above is porous, physically and biologically stable, has high mechanical strength and durability, and has an economic advantage of being able to collect and use natural materials.

On the other hand, as mentioned above, the reaction with calcium oxide, aluminum powder and sodium hydroxide causes premature curing, but cracking may occur due to such early curing. Thus, in the ground improvement agent of the present embodiment, coconut fiber in the form of short fibers is added so as to relax the tensile force generated in the paste during the curing process so as to control the crack. After curing, the coconut fiber is fermented in the ground to function as a compost source .

The coconut fiber itself has a large tensile strength, thereby sufficiently relaxing the tensile force of the paste generated in the curing process, and acts as a compost source in the paper due to the vegetable material. The term " short fiber form " means a form of fiber yarn having a length of 5 to 10 mm. When the length is less than 5 mm, the crosslinking effect is insufficient. When the length exceeds 10 mm, entanglement occurs. That is, the coconut fiber is added in a short fiber form.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be defined by the claims.

10: stirring device 20: rotation driving device
30: air injection device 40: chemical liquid injection device
100: rotating body 110:
120: mounting tube 130: injection hole
140: stirring wing 150: digging plate
160: gas suction part

Claims (9)

Driving means;
A tube having a gas suction part formed at a lower portion thereof;
A mounting tube having a plurality of injection holes for injecting the chemical solution into the soil which is orthogonal and agitated at the end of the tube inlet;
A rotating body having a pair of rotating shafts rotating at both ends of the mounting tube by receiving a rotating force from the driving unit;
A stirring blade including a first rotating blade and a second rotating blade each of which is composed of a curved surface, the first rotating blade and the second rotating blade being coupled to and coupled to respective rotating shafts and having a plurality of spikes on an outer surface thereof;
Wherein the first mixing unit and the second mixing unit are arranged in the same direction. The method according to claim 1,
Further comprising an excavating plate which is provided at one end and the other end with a protruding portion having a pointed shape and is mounted on the rotating shaft in a direction perpendicular to the rotating shaft at an end of a rotating radius of the stirring vane, Further comprising a pivot pin penetrating the pivot shaft to penetrate the pivot shaft to the pivot shaft and allowing the pivot shaft to pivot, and a stopper for limiting a pivot range of the pivot shaft. The method according to claim 1,
Further comprising a stirring blade control device, wherein the stirring blade control device comprises: a control main body coupled to the rotation shaft; And a stirring vane shaft coupled to the control body, the stirring vane axis being perpendicular to the rotation axis and having an end coupled to the stirring vane. The method of claim 3,
The stirring blade shaft
A first wing shaft coupled with the first rotary wing; And
And a second wing axis coupled with the second rotary wing,
Wherein the control body separates the first wing axis and the second wing axis from each other and controls the rotation of the first wing axis and the second wing axis individually. 5. The method of claim 4,
Wherein the control body is configured to adjust an interval between the first wing axis and the second wing axis. The method of claim 3,
Wherein the control body is guided by the rotation shaft so as to be conveyed to one side or the other side of the rotation shaft. Performing in-situ in-situ agitation of the contaminated soil to a planned depth using the in-situ stirring mixer of any one of claims 1 to 6;
Adding a chemical solution containing hydrogen peroxide, persulfate and organic acid to the stirred soil;
Extracting contaminants generated by reaction with the chemical liquid;
And a step of injecting a soil conditioner containing calcium oxide into the agitated soil. The hybrid purification method using the in-situ mixed-contaminated soil agitation using the in-situ agitation mixing apparatus. 8. The method of claim 7,
Wherein the chemical liquid is a mixture of 5 to 10 parts by weight of hydrogen peroxide, 5 to 10 parts by weight of persulfate, 5 to 10 parts by weight of organic acid, 1 to 3 parts by weight of calcium oxide and aluminum powder mixture with respect to 100 parts by weight of electrolytic water produced using a potassium chloride electrolyte, And 0.5 to 2 parts by weight of a tannin-containing plant extract. The hybrid purification method using the in-situ hybrid contaminated soil agitation using the in-situ agitation mixing apparatus. 8. The method of claim 7,
The soil conditioner is preferably used in an amount of 10 to 20 parts by weight of silica, 5 to 10 parts by weight of scoria, 5 to 10 parts by weight of aluminum powder, 1 to 3 parts by weight of sodium hydroxide, 1 to 3 parts by weight of polycarboxylic acid- And 0.5 to 2 parts by weight of coconut fiber in the form of a short fiber. The hybrid purification method using the in-situ mixed-contaminated soil agitation using the in-situ stirring mixer.

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