KR20140000553A - Apparatus for agitating polluted soil and method for remediating soil polluted with oil using the same - Google Patents

Abstract

The present invention relates to an apparatus for stirring polluted soil and a method for remediating polluted soil including organic compounds using the same. The apparatus for stirring polluted soil according to the present invention comprises a hopper for inputting soil polluted by organic compounds including oil; a transfer unit including a transfer pipe having one end part thereof connected to the hopper to introduce polluted soil and having an outlet for discharging polluted soil formed at the other end part thereof, and a screw installed in the transfer pipe to be able to rotate so as to transfer the polluted soil to the outlet; a pulverizing unit including a housing having an inlet for introducing the polluted soil from the transfer unit and an outlet for discharging the polluted soil, and a pulverizer installed in the housing to crush and pulverize the polluted soil; a stirring unit including a case having an entrance part for introducing the polluted soil from the pulverizing unit and an exit part for discharging the polluted soil, and a stirrer installed in the case to stir the polluted soil and treatment liquid for restoring the polluted soil to be discharged to the exit part. [Reference numerals] (AA) Input; (BB) Transfer; (CC) Pulverization; (DD) Mixed transfer; (EE) Discharge

Description

Technical Field [0001] The present invention relates to a polluted soil agitation apparatus and a method for restoring contaminated soil containing organic compounds using the same,

TECHNICAL FIELD The present invention relates to a technology for restoration of environmental pollution, and more particularly, to a method for recovering contaminated soil for treating contaminated soil contaminated with an organic compound such as oil by a chemical method, and a contaminated soil agitation apparatus used in the method for recovering the contaminated soil will be.

Leakage of underground oil storage tanks and soil pollution caused by toxic compounds have been a serious threat to countries with high dependence on groundwater in Europe and North America over the past decades. .

In particular, oil compounds are composed of various components. Each component exhibits different physico-chemical transport properties in the underground hydraulic system and has long-term latency in the soil, which has a detrimental effect on the surrounding environment. In Korea, the consumption of oil has increased rapidly as the industry has advanced and complicated. Recently, it has been reported that pollution of soil and groundwater is considerable due to frequent oil spill accidents due to aging of oil storage tanks and careless handling .

In terms of the status of domestic underground storage tanks, 180,000 storage tanks are buried in large oil refineries and other industrial facilities. Due to the aging of tanks and poor management, only 140,000 liters (about 700,000 drums) The oil was found to leak.

Once the soil is contaminated, it adversely affects the water quality of the surface water and the ground water. Since there is a possibility of causing secondary pollution, the oil contaminated soil should be purified and restored in a short time.

As a method for recovering oil contaminated soil, a biological treatment method using a microorganism or a chemical treatment method is used. In particular, a method of performing highly oxidative decomposition of an organic compound present in the soil through chemical treatment such as ozone or Fenton oxidation It is widely used. The Fenton reaction or the Fenton-like reaction is suitable for an environment in which a large amount of various organic pollutants or inorganic pollutants are discharged because of its wide application range, and the efficiency and economical efficiency are comparatively excellent.

However, in the conventional method using the Fenton's reaction, the oxidizing agent and the organic pollutant are not sufficiently contacted to each other and the oxidation reaction can not be performed smoothly. Particularly, in the case of an organic compound, when the oxidizing agent flows into the aqueous solution state because of the water-insoluble property, the contact between the oxidizing agent and the oxidizing agent does not proceed smoothly.

Further, in the fine-grained soils such as clay, there is not enough pores between the soil particles, so that the oxidant does not smoothly contact the organic contaminants.

On the other hand, the conventional Fenton reaction method injects an oxidizing agent into the contaminated soil soil. However, since the oxidizing agent injected into the ground is rapidly consumed before reaching the target area, the concentration of the oxidizing agent is considerably lowered in the target area. Therefore, mixing of the soil and the oxidizer is carried out by using an excavator. However, since the mixing operation using the excavator is not precise, the mixing ratio is lowered and the economical efficiency of the method is significantly lowered.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems and it is an object of the present invention to provide a contaminated soil agitation device capable of evenly mixing contaminated soil and oxidant so that the contaminated soil contaminated with oil and oxidizing agent can sufficiently contact with each other, And to provide a method for restoring contaminated soil.

In order to achieve the above object, according to the present invention, there is provided a contaminated soil agitation apparatus including a hopper for inputting contaminated soil contaminated with oil, one end connected to the hopper for introducing the contaminated soil, A conveyance unit including a conveyance pipe having a discharge port formed therein and a screw rotatably installed in the conveyance pipe for conveying the contaminated soil to the discharge port side, an inlet port through which the contaminated soil flows from the conveyance unit, A crushing unit disposed in the housing and including a crusher for crushing and crushing the contaminated soil; and an inlet portion through which the contaminated soil flows from the crushing unit, A case in which an outlet for discharging the contaminated soil is formed; It is provided is characterized in comprising, including the stirring unit to stir the treatment solution for recovering the contaminated soil and the soil contamination includes an agitator for discharging parts of the outlet.

According to the present invention, the treatment liquid is a first treatment liquid and a second treatment liquid, and the first treatment liquid and the second treatment liquid are independently supplied to the contaminated soil. To this end, in the present invention, a first feeder connected to the transfer unit to supply the first treatment liquid to the contaminated soil, and a second feeder connected to the stirring unit to supply the second treatment liquid to the contaminated soil. It is further provided with two feeders.

In one embodiment of the present invention, the crusher includes a main body portion formed in a cylindrical shape and rotatably installed in the housing and having a pair of flange portions protruded at both ends thereof, and a plurality of A plurality of supporting members which are sandwiched between the pair of flange portions; a plurality of impact members rotatably fitted on the supporting rods and rotated when the main body rotates to hit the contaminated soil to crush the contaminated soil; Respectively.

Further, in an embodiment of the present invention, the stirrer may include a rotation bar rotatably installed in the case, and a plurality of the rotation bar are disposed apart from each other along the longitudinal direction of the rotation bar, And an agitating screw having a plurality of vanes having a plurality of vanes. Particularly, the stirring screws are arranged in parallel to each other in parallel with the case, and are rotated together. The blades of the stirring screws adjacent to each other are arranged at the same positions along the longitudinal direction of the rotation bar, Wherein each of the blades is disposed along the circumferential direction of the rotation bar so that the blades adjacent to each other sequentially pass through the crossing area when the plurality of stirring screws rotate together Is determined.

And, the wings, a pair of clamp members surrounding the rotating rod is detachably coupled, the coupling shaft is formed protruded with respect to the rotating rod and detachably coupled to the clamp member, and coupled to the coupling shaft It is provided with a plate-shaped wing part, and a pair of clamp member and a wing part can be replaced easily at the time of abrasion.

On the other hand, the contaminated soil restoration method for achieving the object of the present invention by using the contaminated soil agitator of the above configuration, excavating the contaminated soil contaminated with the organic compound, the input step of putting into the contaminated soil agitator And a first treatment step of injecting the first treatment liquid containing ferrous sulfate into the contaminated soil while transferring the contaminated soil through a transfer unit of the contaminated soil stirring device, wherein the first treatment liquid is injected. A grinding step of crushing and crushing the soil in the crushing unit of the contaminated soil stirring device and injecting a second treatment liquid containing hydrogen peroxide into the crushed soil, and the first treatment liquid, the second treatment liquid and the contaminated soil It comprises a second treatment step of stirring and processing through the stirring unit of the contaminated soil treatment device to be evenly mixed.

In addition, the second treatment liquid may further include an oxidizing aid, a chelating agent, and a surfactant, and the contaminated soil may be applicable to clays having low porosity.

In the present invention, there is an advantage that the polluted soil can be smoothly purified through the Fenton reaction by stirring the polluted soil so that the polluted soil is sufficiently in contact with hydrogen peroxide and ferrous sulfate.

In addition, in the present invention, by thoroughly crushing the contaminated soil before agitating the contaminated soil and the treatment liquid, the contaminated soil is brought into contact with the treatment liquid to effectively purify the soil.

1 is a schematic diagram of a contaminated soil agitation apparatus according to an embodiment of the present invention.
2 is a schematic perspective view of a grinding unit with the cover removed in the contaminated soil stirring apparatus shown in Fig.
3 is an actual photograph of the crushing unit with the cover shown in Fig. 2 being taken off.
4 is an actual photograph of a stirring unit in a state of being uncovered in the contaminated soil stirring apparatus shown in Fig.
Fig. 5 is a schematic exploded perspective view of the main part of the stirring unit shown in Fig. 4;
6 is a view for explaining the arrangement angle of the wing portion of the stirring unit.
FIG. 7 is a schematic flowchart of a method for recovering contaminated soil according to an embodiment of the present invention.
8 and 9 are experimental results of treating the contaminated soil using the contaminated soil agitator and treatment liquid according to the present invention.

Hereinafter, a contaminated soil agitation apparatus according to an embodiment of the present invention will be described with reference to the accompanying drawings, and then a method for recovering contaminated soil using the same will be described.

FIG. 1 is a schematic view of a contaminated soil agitation apparatus according to an embodiment of the present invention, FIG. 2 is a schematic perspective view of a grinding unit with a cover removed in the contaminated soil agitation apparatus shown in FIG. 1, Is an actual photograph of the crushing unit with the cover removed.

1 to 3, a contaminated soil agitation apparatus 100 according to an embodiment of the present invention includes a frame 10, a hopper 20, a transfer unit 30, a crushing unit 40, (50).

The frame 10 is for supporting the transfer unit 30, the crushing unit 40, etc. constituting the contaminated soil agitation apparatus 100. That is, the horizontal frame 11 is installed on the ground via a wheel (not shown). A plurality of vertical frames 12 are coupled to the horizontal frame 11 along a vertical direction.

The hopper 10 is for feeding contaminated soil, and is supported on a vertical frame 12 installed at a high position on one side of the horizontal frame 11. The hopper 20 is wide in the upper part and narrow in the lower part, facilitating the introduction of the contaminated soil through the open upper part.

The transfer unit 30 is connected to the lower portion of the hopper 20 so as to supply the contaminated soil introduced from the hopper 20 to the crushing unit 40 to be described later at a predetermined speed and amount. The transfer unit 30 includes a transfer tube 31 and a screw (not shown).

The transfer pipe 31 is formed in the shape of an empty tube and has an outlet 32 communicating with the hopper 20 at one end to receive contaminated soil and at the other end to discharge contaminated soil. The screw is rotatably installed in the transfer pipe (31). A motor (35) for rotating the screw is provided outside the transfer pipe (31). The screw is rotated at the same position, but the contaminated soil is conveyed at a constant speed toward the discharge port 32 by the conveying blade formed in a spiral shape on the screw. The constitution of the screw is a well-known member, which is widely used for transferring the material, and thus a detailed description thereof will be omitted.

In addition, an upper portion of the transfer pipe 31 is provided with a tube 36 for supplying the first treatment liquid for purifying the contaminated soil into the transfer pipe 31. 1 is connected to the first feeder 39 for supplying the treatment liquid. The first treatment liquid may be used in various ways depending on the nature and type of contaminated soil. In this embodiment, an aqueous solution containing ferrous sulfate is used as the first treatment liquid. When the first treatment liquid is supplied to the transfer pipe 31, the contaminated soil is mixed with the first treatment liquid in the process of being moved in the transfer pipe 31.

The grinding unit 40 is for grinding and crushing the contaminated soil mixed with the first treatment liquid. In the case of fine soil such as clay or soil containing a lot of moisture, even if the second treatment liquid which will be described later is injected, there is a problem that it is not sufficiently mixed with the second treatment liquid as described in the related art. . Accordingly, in the present invention, the contaminated soil is crushed in order to crush the soil forming the entrances and to enlarge the surface area of the soil particles contaminated with oil to the outside.

The crushing unit 40 for carrying out the above-mentioned operation includes a housing 41 and a crusher 49. The housing 41 is a case for accommodating the crusher 49. An inlet 41 communicating with the discharge port 32 of the conveying unit 30 is formed in the upper portion of the housing 41 and a crusher 49 To the stirring unit 50, which will be described later, is formed.

The crusher 49 is installed in the housing 41 for crushing and crushing the contaminated soil. The crusher 49 has a cylindrical main body portion 43. The main body portion 43 is coaxially coupled to a rotation shaft 44 formed in a horizontal direction and rotatably supported on the housing 41 and rotated together with the rotation shaft 44. The rotary shaft 44 is connected to a driven pulley 45 which is connected to a drive pulley (not shown) by means of a belt 46. The drive pulley is provided with a rotational force by a drive motor (not shown). That is, the drive motor provides a rotational force to the rotary shaft 44 through the drive pulley, the belt 46, and the driven pulley 45.

At both ends of the pulverizer main body 43, a pair of flange portions 43a are provided. The pair of flange portions 43a are formed so as to protrude from the body portion 43 and are arranged to face each other. Between the pair of flange portions 43a, a support rod 47 is fitted and engaged. A plurality of support rods 47 are arranged at intervals of a predetermined angle along the circumferential direction of the main body 43.

Each supporting rod 47 is supported rotatably by a striking member 48 for crushing and crushing the contaminated soil. The striking member (48) receives centrifugal force when the main body (43) rotates, and rotates to hit the contaminated soil to crush and crush the contaminated soil.

A plurality of striking members 48 are provided on the support bar 47 so as to be spaced apart from each other and a plurality of stoppers 48 are provided on the support bar 47 to prevent the striking member 48 from being moved over a predetermined range along the support bar 47 47a are fixedly installed.

The contaminated soil crushed and crushed through the crushing unit 40 flows into the stirring unit 50 connected to the crushing unit 40. 4 to 6 show a stirring unit 50. In Fig. Fig. 4 is an actual photograph of the agitating unit with the lid removed in the contaminated soil agitating apparatus shown in Fig. 1, Fig. 5 is a schematic exploded perspective view of the main part of the agitating unit shown in Fig. 4, And Fig.

4 to 6, the stirring unit 50 stirs together the contaminated soil, the first treatment liquid and the second treatment liquid to be described later, and mixes the contaminated soil with the first treatment liquid and the second treatment liquid to purify it. Is to handle.

The second treatment liquid is supplied to the front end of the stirring unit 50 through the tube 68 from the second feeder 69 installed in the frame 12. The second treatment liquid may be used in various ways depending on the nature and type of the contaminated soil. In this embodiment, an aqueous solution containing hydrogen peroxide is used. As described above, in the present embodiment, the first treatment liquid and the second treatment liquid are independently supplied to the contaminated soil through the first feeder 39 and the second feeder 69, and mixed with each other in the stirring unit 50. do.

The stirring unit 50 includes a case 51 and a stirrer 59. An inlet portion (not shown) communicating with the crushing unit 40 to allow contaminated soil to flow in is formed at the front end of the case 51 And an outlet portion 52 through which the soil subjected to the agitation and the purification treatment can be discharged is formed on the lower side of the rear end portion.

The agitator 59 is composed of a plurality of stirring screws 58 arranged in parallel in the case 51. In this embodiment, two stirring screws 58 are provided. The agitating screw 58 has a rotating rod 57 and a plurality of blades 56. The rotating rod 57 is horizontally disposed and rotatably supported by the case 51 via a bearing (not shown).

 The wings 56 are spaced apart from each other along the longitudinal direction of the rotation bar 57 and are provided with a pair of clamp members 55, a coupling shaft 54 and a wing 53. The pair of clamp members is for interchangeably mounting the vanes 56 on the swivel rods 57. [ A pair of clamp members 55 are formed in an arc shape and are arranged to surround the rotation bar 57 and are fastened to each other by using bolts 55a and nuts 55b. The coupling shaft 54 is coupled to either one of the pair of clamp members 55 and is formed so as to protrude in the radial direction of the rotation bar 55. The engagement shaft 54 is formed with a screw hole 54a.

The wing portion 53 is formed in a plate shape to stir the first treatment liquid, the second treatment liquid and the contaminated soil, and is coupled to the coupling shaft 54 by a screw 53a fastened to the screw hole 54a. do. Since the wing portion 53 is continuously contacted with the contaminated soil to be worn, only the wing portion 53 can be replaced, and the entirety of the wing 56 can be replaced by separating the pair of clamp members 55 .

As described above, two stirring screws 58 are provided in parallel in the case 51, and the wings 53 attached to the stirring screws 58 are rotated in the longitudinal direction of the rotating rod 57 As shown in Fig. When the two stirring screws (58) are rotated together, an area where mutually adjacent wings (53) cross each other occurs between the two stirring screws (58).

Therefore, when the wing portions 53 attached to the two stirring screws pass this crossing region, a collision may occur between the wing portions 53. Thus, in this embodiment, even when the agitating screw 58 rotates together by adjusting the angle at which the wing portion 53 is installed along the circumferential direction of the swinging rod 57, two wing portions adjacent to each other sequentially form the crossing region . However, adjusting the arrangement angles of the wings 53 adjacent to each other is not a passive merely for avoiding collision, and is for continuously stirring the contaminated soil in the crossing area.

Further, two stirring screws are manufactured so as to be interlocked with the motors not shown to be driven together.

6, the wing portion 53 is inclined at a predetermined angle? With respect to the longitudinal direction of the swinging rod 57, And pushes it toward the outlet portion 52 to feed it.

Hereinafter, a method for recovering contaminated soil using the contaminated soil agitation apparatus 100 constructed as described above will be described. A schematic flow diagram of the contaminated soil recovery method according to the present invention is shown in Fig.

Referring to FIG. 7, the method for recovering contaminated soil according to the present invention starts from an input step M10. In the input step M10, the soil contaminated with oil is excavated and the contaminated soil is introduced through the hopper 20 of the contaminated soil agitation apparatus 100 having the above-described configuration.

Thereafter, while transferring the contaminated soil to the grinding unit 30 through the transfer unit 20, the contaminated soil in an aqueous solution containing ferrous sulfate, more specifically iron salt, which is the first treatment liquid through the first feeder. The first processing step M20 is supplied. In this process, the ferrous sulfate is mixed with the first treatment liquid in the process of transferring from the transfer unit 20.

The contaminated soil mixed with the first treatment liquid is crushed by the striking body 48 in the crushing unit 40 of the contaminated soil stirring device to perform a crushing step M30. Particularly, when the contaminated soil is fine like clay or contains a large amount of water, the area of the soil particles exposed to the outside through the pulverization step (M30) becomes large. Accordingly, the soil particles can be expected to have an effect of widening the contact area with the first treatment liquid as well as the second treatment liquid to be described later.

On the other hand, the contaminated soil crushed and crushed in the crushing unit 40 is discharged to the stirring unit 50. The second feeder 69 supplies the second processing liquid to the front end of the stirring unit 50. The second treatment solution is an aqueous solution containing hydrogen peroxide, which induces a Fenton reaction with ferrous sulfate to purify soil contaminated with oil. In addition to the hydrogen peroxide, the second treatment liquid used in the present invention further includes an oxidizing aid, a chelating agent, and a surfactant. More specifically, a solution of 7% concentration of hydrogen peroxide is used, SPA (sodium peroxy sulfuric acid) of 0.5% concentration is used as an oxidizing auxiliary agent, EDTA-4Na solution (or citric acid) of 0.01% And 0.01% dodecyl benzene sulfonic acid salt is used as the surfactant.

By performing a second treatment step M40 of stirring the contaminated soil with the first treatment liquid and the second treatment liquid while rotating the plurality of wings 56 in the stirring unit 50, the contaminated soil is treated with the first treatment liquid and the first treatment liquid. 2 Fenton reaction can be made smoothly in contact with the treatment solution.

As described above, the Fenton reaction which occurs when the oil-contaminated soil is in contact with the first treatment liquid and the second treatment liquid will be briefly described.

The Fenton's reaction is used to oxidize the organic material on the aqueous solution by using iron ions (Fe ^{2 +} ) as a catalyst to decompose the hydrogen peroxide. At this time, a strong oxidizing agent hydroxyl radical (OH) It is a process to remove contaminants from the soil. The decomposition process of the contaminants in the Fenton reaction can be explained by the oxidizing power of the OH radical. Reaction equations (1) and (2) show the formation process of OH ㆍ in the decomposition process of hydrogen peroxide.

H ₂ O ₂ ^{+ Fe 2 + → OH + OH} - + Fe 3 + ... Equation (1)

RH + OH - > R - + H ₂ O ₂ ... Reaction (2)

(Where RH is an organic contaminant)

In the process described above, the organic pollutants are detoxified in the soil and purified.

Generally, the hydrogen peroxide decomposition process in which iron ions act as a catalyst involves a variety of reactions, which occur in the form of a chain reaction involving the following oxidation and reduction steps.

Fe ^{3 +} + H ₂ O ₂ → Fe ^{2 +} + H ⁺ + HO ₂ Reaction formula (3)

Fe ^{2 +} + H ₂ O ₂ → Fe ^{3 +} + OH ^- + OH. Reaction formula (4)

OH + H ₂ O ₂ H ₂ O + HO ₂ Reaction formula (5)

???????? HO ₂ + + Fe ^{3 +} ? Fe ^{2 +} + H ⁺ + O ₂ ????? (6)

HO _{2 -} + Fe ^{2 + -} > Fe ^{3 +} + HO ₂ ^-

3H ₂ O ₂ → 2H ⁺ + OH ^- + HO ₂ ^- + H ₂ O + O ₂ (8)

The hydroxyl radicals (OH) are produced by the reaction formula (4) and then consumed by the reaction formula (5), and HO ₂ is generated by the reaction formulas (3) and (5) (7). Fe ^{3 +} and Fe ^{2 +} react with oxidation and reduction processes as in equations (3) - (8) to generate O ₂ . The generation of oxygen gas bubbles is greatly increased by the sequential reactions. The generation of oxygen bubbles removes the organic contaminants adhering to the surface of the soil and attaches to the surface of the bubbles and moves to the upper part of the liquid layer As a result, it shows the effect of separating contaminants from the soil.

Also, in the presence of a soil component contaminated with a hydrogen compound in a hydrogen peroxide solution, a hydrogen peroxide is decomposed by a generalized hydrogen peroxide, followed by a catalytic hydrogen peroxide decomposition reaction and an oxidation reaction of the organic matter by the generated OH. The decomposition mechanism of the pollutants by the decomposition of hydrogen peroxide on the surface of the soil minerals is as follows. The contaminants in the soil are generally present in the state of sorption, and some of the hydroxyl radicals generated on the surface of minerals penetrate the liquid-solid interface, Attack and increase the solubility in water and desorb primarily. In this case, as the solubility in water increases, the contact reaction by the hydroxyl radical is easier as the organic compound having desorbed contaminants, especially water, is more soluble. Therefore, the state of adsorbed on the soil by the electron exchange by the hydroxyl radical on the surface of iron ore It decomposes faster.

As described above, in the present invention, the organic matter is detoxified in the soil and purified through the first treatment solution, the second treatment solution, and the Fenton reaction. In this process, the oxidizing auxiliaries and chelating agents help the Fenton reaction to last for a long time, and the surfactant acts to disperse the soil.

The present applicant has experimented with a method for recovering contaminated soil using the contaminated soil agitation apparatus 100 described above.

In the first experiment, ₂₅ L of 500 mM sulfuric acid water (mixed with Na ₂ S ₂ O ₈ and water) was mixed with 500 L of contaminated soil, ₂₅ L of 5 mM iron salt (70 g FeSO ₄ · 7H ₂ O and water) and aqueous hydrogen peroxide solution, In the second experiment, 100 kg of contaminated soil was mixed with hydrogen peroxide and a 4% iron salt, 10 g of an oxidation auxiliary agent, 10 g of a chelating agent and 10 g of a surfactant. For comparison, no treatment solution was used for contaminated soil.

The results of the first experiment are shown in FIG. 8, and the results of the second experiment are shown in the table of FIG. Comparison stand

8 and 9 are experimental results of treating contaminated soil using a contaminated soil stirring apparatus and a treatment liquid according to the present invention.

Referring to the experimental results of FIGS. 8 and 9, when the first treatment liquid and the second treatment liquid according to the present invention are injected into the contaminated soil and stirred, the oil is gradually changed over time when compared with the blank. It was confirmed that the concentration is significantly reduced.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation and that those skilled in the art will recognize that various modifications and equivalent arrangements may be made therein. It will be possible. Accordingly, the true scope of protection of the present invention should be determined only by the appended claims.

100 ... Contaminated soil agitation device 10 ... Frame
20 ... hopper 30 ... transfer unit
40 ... crushing unit 50 ... stirring unit

Claims (10)

A hopper for introducing contaminated soil contaminated with an organic compound containing oil;
A transfer pipe having one end connected to the hopper for introducing the contaminated soil and the other end formed with a discharge port for discharging the contaminated soil; and a discharge pipe rotatably installed in the transfer pipe, A conveying unit including a screw for conveying;
A crushing unit installed in the housing to crush and crush the contaminated soil; a crushing unit installed in the crushing unit for crushing and crushing the contaminated soil;
Stirring the processing liquid for restoring the contaminated soil and the contaminated soil, and a case having an inlet part through which the contaminated soil is introduced from the crushing unit and an outlet for discharging the contaminated soil; And a stirring unit comprising a stirrer for discharging to the outlet. The method of claim 1,
As the treatment liquid, a first treatment liquid and a second treatment liquid are used.
And the first treatment liquid and the second treatment liquid are independently supplied to the contaminated soil. 3. The method of claim 2,
A first feeder connected to the transfer unit for supplying the first treatment liquid to the contaminated soil;
And a second feeder connected to the stirring unit for supplying the second treatment liquid to the polluted soil. The method of claim 1,
The grinder,
A main body portion formed in a cylindrical shape and rotatably installed in the housing and having a pair of flange portions protruding from both ends thereof;
A plurality of support rods disposed in a circumferential direction of the main body portion and sandwiched between the pair of flange portions,
And a plurality of striking members rotatably fitted on the support rods and rotated when the main body rotates to strike the contaminated soil to crush the contaminated soil. The method of claim 1,
The stirrer may include:
A rotation bar rotatably installed in the case,
And a plurality of blades spaced apart from each other along the longitudinal direction of the rotating bar and having a plate shape and having a plurality of blades protruded from the rotating bar. The method of claim 5,
A plurality of stirring screws are arranged side by side in the case and are rotated together,
Wherein each of the blades of the agitating screw adjacent to each other is disposed at the same position along the longitudinal direction of the rotating bar so that a crossing region where the blades intersect each other is formed between the agitating screws adjacent to each other,
Wherein an angle at which the blades are disposed along the circumferential direction of the rotation bar is determined so that the adjacent blades sequentially pass through the crossing area when the plurality of stirring screws rotate together. The method of claim 5,
The wing
A pair of clamp members which are coupled to each other around the rotation bar,
A coupling shaft formed to protrude from the rotating rod and coupled to the clamp member;
And a plate-shaped wing portion coupled to the coupling shaft,
Wherein the pair of clamp members are interchangeably coupled to the rotation bar,
And the wing portion is replaceably coupled to the coupling shaft. A method of restoring contaminated soil for restoring soil contaminated with organic compounds containing oil using the contaminated soil agitator according to any one of claims 1 to 7,
An excavating step of excavating the contaminated soil contaminated with the organic compound and inputting the excavated soil to the contaminated soil stirring apparatus;
A first treatment step of injecting the first treatment liquid containing ferrous sulfate into the contaminated soil while transferring the contaminated soil through a transfer unit of the contaminated soil stirring device;
A pulverizing step of pulverizing and crushing the contaminated soil into which the first treatment liquid is injected in a crushing unit of the contaminated soil stirring device; And
Injecting a second treatment solution containing hydrogen peroxide into the ground soil, and agitated through the stirring unit of the soil treatment device so that the first treatment liquid, the second treatment liquid and the soil contaminated evenly mixed; Polluted soil restoration method comprising the two; processing step. 9. The method of claim 8,
The second treatment liquid is a soil recovery method characterized in that it further comprises an oxidizing aid, a chelating agent and a surfactant. 10. The method of claim 9,
Wherein the contaminated soil is clay.

Images