JP2015211956A - Radioactive polluted soil cleaning device and system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a safe and efficient polluted soil cleaning device, when polluted soil including a radioactive substance is cleaned, achieving treatment suitable to the radioactive substance.SOLUTION: Provided is a polluted soil cleaning device comprising: a cleaning tank of cleaning polluted soil; an upper cover connected so as to be made sealable with the upper part of the cleaning tank; a first high pressure water injection part provided at the upper part at the inside of the cleaning tank; a filter provided at the lower part of the high pressure water injection part at the inside of the cleaning tank and capable of being mounted with polluted soil at the upper part thereof; and a polluted water exhaust port provided at the lower part of the filter at the inside of the cleaning tank, in which the polluted soil mounted at the upper part of the filter is injected with high pressure water from the high pressure water injection part, the pollutant capable of passing through the filter is introduced into the lower part of the filter, and is exhausted from the exhaust port of the polluted water.

Description

  The present invention generally relates to an apparatus for cleaning soil containing contaminants, and more particularly to an apparatus and system for cleaning radioactive contaminated soil in a sealed state.

  Decontamination of contaminated soil, especially decontamination of soil contaminated with radioactive materials, has become an extremely important issue for the recovery of nuclear power plant disasters. Here, if there is an apparatus that can remove only the radioactive substance adhering to the contaminated soil by washing it with a liquid such as water, the subsequent processing becomes easy.

  As such an apparatus, as described in Patent Document 1, the technical idea of an apparatus for supplying contaminated soil onto a sieve and injecting high-pressure water therein to wash the contaminated soil is disclosed. .

  Moreover, about the process of the wastewater containing the pollutant after washing | cleaning, the technical idea of the wastewater treatment method which solidifies wastewater using the gelatinizer as described in patent document 2 is disclosed. Furthermore, Patent Document 3 discloses a technical idea of a wastewater treatment apparatus that executes such a treatment method in a substantially sealed state.

JP 2005-279454 A Japanese Patent No. 5175378 Japanese Patent Application No. 2014-045783

  However, according to the apparatus described in Patent Document 1, the pollutants that are the target of the contaminated soil are heavy metals, oils, and dioxins, not radioactive materials that require special handling, and wastewater that contains pollutants after washing. After being filtered, it is discharged into the sewer or reused for cleaning. This also has a problem when a radioactive material requiring special handling is targeted.

  Therefore, an object of the present invention is to provide a safe and efficient contaminated soil cleaning apparatus and system that can be handled in conformity with the radioactive material when cleaning the contaminated soil containing the radioactive material.

The present invention is a contaminated soil cleaning apparatus for cleaning soil containing contaminants to solve the above-mentioned problems,
A contaminated soil cleaning device for cleaning soil containing pollutants,
A) a washing tank having a bottom and side surfaces in a substantially sealed state, the top being open, and washing contaminated soil inside;
B) An upper lid that is open at the bottom and connects the bottom and the top of the washing tank in a sealable manner;
C) a first high-pressure water injection unit provided at the top inside the cleaning tank;
D) A filter provided inside the cleaning tank below the first high-pressure water injection unit and on which the contaminated soil can be placed;
E) High-pressure water from the first high-pressure water injection unit on the contaminated soil placed above the filter in a substantially sealed state, having a contaminated water discharge port provided below the filter inside the washing tank The pollutant that can pass through the filter is guided below the filter and discharged from the contaminated water discharge port.

  According to this, the radioactive substance adhering to the contaminated soil is removed by high-pressure water, and in particular, the radioactive substance having a small particle diameter passes through the filter and is discharged from the discharge port as contaminated water, and comprises a washing tank and an upper lid. Since the whole can be in a substantially sealed state, that is, in a sealed state except for entrances and exits such as soil and water, the risk of scattering of radioactive materials can be minimized.

The contaminated soil cleaning apparatus of the present invention further includes
F) It is good also as having the stirring part which is provided above a filter inside a washing tank, and stirs contaminated soil. According to this, cleaning water spreads to the depths of the contaminated soil, and the cleaning effect is enhanced.

The contaminated soil cleaning apparatus of the present invention further includes
G) It is good also as having the partition plate which is provided under the filter and mounts a filter inside a washing tank. According to this, since the partition plate for placing the filter is provided, the filter can be easily installed.

The contaminated soil cleaning apparatus of the present invention further includes
H) It is good also as having the 2nd high-pressure water injection part which injects high-pressure water in order to wash a filter provided in the inside of a washing tank under a partition plate and above a polluted water discharge port. . According to this, since high-pressure water for cleaning the filter can be jetted, it can be used for a long time.

  The contaminated soil cleaning apparatus of the present invention may be characterized in that the cleaning tank is separated into an upper intermediate tank and a lower processing tank.

  According to this, for example, by providing the first high-pressure water injection unit in the intermediate tank and providing the filter or the like in the treatment tank, it is possible that the treatment of the residual contaminated soil after the radioactive substance removal is facilitated.

  In another this invention, it is the contaminated soil washing | cleaning system containing the contaminated soil washing | cleaning apparatus of this invention, and the waste water treatment apparatus using a gelatinizer.

  According to this, it becomes possible to perform a series of operations in which the contaminated water discharged from the contaminated soil cleaning device is processed and solidified by the wastewater treatment device, and there is a risk that the contaminated water is purified and discharged into the sewer. The accompanying process is unnecessary.

  In another aspect of the present invention, the contaminated soil cleaning apparatus of the present invention, a high-pressure water supply unit for supplying high-pressure water for cleaning the contaminated soil, and a surface tension depressant for adding a surface tension depressant to the high-pressure water A contaminated soil cleaning system including an addition unit.

  According to this, by inhibiting the surface tension of the contaminated soil, it is possible to reduce the inhibition of permeation on the surface of the contaminated soil, and to allow the cleaning water to penetrate into the contaminated soil. As a result, it becomes possible to remove more substances having a small particle diameter from the contaminated soil, and an efficient contaminated soil cleaning system is obtained.

  According to the contaminated soil cleaning apparatus of the present invention, the radioactive material contained in the contaminated soil is removed by the cleaning water in a substantially sealed state, so that the risk of exposure to radioactive materials can be minimized. , Safe and efficient processing becomes possible.

  Further, according to the contaminated soil cleaning system of the present invention, it is possible to consistently carry out from the cleaning of the contaminated soil to the solidification treatment of the contaminated water, and high efficiency can be obtained.

It is a perspective view of the contaminated soil cleaning apparatus of one embodiment of the present invention. It is sectional drawing of the contaminated soil washing | cleaning apparatus of one Embodiment of this invention. It is a perspective view containing the stirring part of the contaminated soil washing | cleaning apparatus of one Embodiment of this invention. It is a top view of the stirring part used for the contaminated soil washing | cleaning apparatus of one Embodiment of this invention. It is explanatory drawing of the contaminated soil washing | cleaning system of another embodiment of this invention. It is a one part perspective view of the contaminated soil washing | cleaning system of another embodiment of this invention. It is typical sectional drawing of a part of contaminated soil washing | cleaning system of another embodiment of this invention. It is explanatory drawing of the contaminated soil washing | cleaning system of another embodiment of this invention.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a perspective view of a contaminated soil cleaning apparatus 1 according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of the contaminated soil cleaning apparatus 1 according to an embodiment of the present invention.

  It has the washing tank 10 which performs the washing process of contaminated soil, and the upper cover 20 connected with the upper part of a washing tank so that sealing is possible. Here, the cleaning tank 10 is divided into a lower processing tank 11 and an upper intermediate tank 12. The processing tank 11 and the intermediate tank 12, and the intermediate tank 12 and the upper lid 20 are detachably connected to each flange portion by bolts and nuts. Moreover, in order to ensure the airtightness between these, a rubber packing is used suitably.

  A high-pressure water supply pipe 31 is inserted into the intermediate tank 12 on the side surface of the intermediate tank 12, and high-pressure water is sent to the high-pressure water supply pipe 31 from a high-pressure water supply unit (not shown). The high-pressure water supply pipe 31 is provided with a plurality of openings 32 for injecting high-pressure water downward, and the (first) high-pressure water injection part 30 is configured by the high-pressure water supply pipe 31 and the openings 32. The

  Here, a commercially available high-pressure washing machine or the like may be used as the high-pressure water supply unit. It is desirable that the pressure and flow rate can be adjusted, and it is desirable that the pressure is about 8 to 12 MPa at the maximum. However, the pressure is not limited to this. Even things can be used.

  A mesh-like partition plate 70 is fixed above the processing tank 11. The partition plate 70 is preferably a corrosion-resistant metal, but may be made of other materials. The shape is not limited to a mesh shape, and may be any shape that does not hinder the passage of a substance having a small particle diameter, such as a sawtooth shape. On the partition plate 70, four layers of filters 40a, 40b, 40c, and 40d (generally 40) made of fine non-hydrous fibers are placed. Of the four layers, the uppermost layer 40a and the lowermost layer 40d are made of a slightly rough mesh made of stainless steel, and the intermediate two layers 40b and 40c are made of polypropylene fibers, slightly finer, different or the same. Of the mesh. Here, polypropylene is used because it is non-water-containing in resin and does not cause changes in dimensions and performance due to moisture absorption during use, but other substances may be used depending on the situation. Can be used.

  Further, below the partition plate 70, a high-pressure water supply pipe 52 for cleaning the filter 40 is inserted into the treatment tank 11 from the side surface of the treatment tank 11, and the high-pressure water supply pipe 51 is pressurized from a high-pressure water supply unit (not shown). Water is sent. The high-pressure water supply pipe 51 is provided with a plurality of openings 52 for injecting high-pressure water upward, and the (second) high-pressure water injection part 50 is configured by the high-pressure water supply pipe 51 and the openings 52. The

  A contaminated water discharge port 60 for discharging the contaminated water W treated in the treatment tank 11 is provided on the side surface near the lowermost part of the treatment tank 11, and from here, a pipe or a hose is connected directly. Thus, the contaminated water W is guided to the next process. In addition, in the vicinity of the contaminated water discharge port 60, there is a sealing plug 61 having a screwing structure for preventing leakage, which can close the discharge port.

  Note that a stirring unit for stirring the contaminated soil may be provided above the four-layer filter 40. FIG. 3 is a perspective view including the stirring unit 45 of the contaminated soil cleaning apparatus 1 according to the embodiment of the present invention. FIG. 4 is a plan view of the stirring unit 45 used in the contaminated soil cleaning apparatus according to the embodiment of the present invention. The stirring unit 45 is composed of three metal (preferably stainless steel) stirring rotors 46 each having a spiral blade 462 attached to a shaft 461, a housing 47 for rotatably holding them, and the stirring rotor 46. It comprises a drive transmission unit 48 that is driven to rotate by an external drive source (not shown). Here, the winding direction of the spirals of the three stirring rotors 46 is opposite to the central one, and the efficiency of stirring the contaminated soil is improved. Only one of the parts may be in the reverse direction. Further, the number of stirring rotors 46 is not limited to three, and may be one or more. Further, the agitation unit 45 is not limited to the structure and shape of the contaminated soil agitation rotor shown in the figure, and may be a rotating mechanism, one that applies vibration, one that blows gas or liquid, etc. Any scheme or structure may be used.

The operation of the contaminated soil cleaning apparatus 1 having such a configuration will be described.
First, the upper lid 20 and the intermediate tank 12 are removed from the processing tank 11. With the upper side of the processing tank 11 open, the contaminated soil D contaminated with radioactive material on the filter 40 placed on the partition plate 70 is supplied to a supply mechanism (conveyor, power, not shown). Supplied by a shovel).

  Next, the intermediate tank 12 and the upper lid 20 are placed on the processing tank 11, and they are joined in a substantially hermetically sealed state using bolts, nuts, rubber packing, and the like.

  Next, high pressure water is ejected downward from the high pressure water injection unit 30 provided in the intermediate tank 12. As a result, the substances M2, M3, M4, and M5 having a relatively fine particle size attached to the contaminated soil D are removed. Radioactive materials are also included as such fine particle size materials.

  The removed substances (including radioactive substances) M2-M5 pass through the four-layer filter 40 placed on the partition plate 70 provided in the treatment tank 11 together with the washing water, and the particle size at that time M1 having a large particle size (containing almost no radioactive substance) cannot pass through the filter 40, and a substance having a small particle size (containing a large amount of radioactive substance) passes through the filter 40 and the coarser partition plate 70, It is dropped to the bottom of the treatment tank 11.

  In addition, when the stirring part 45 is provided in the upper part of the four-layer filter 40, the contaminated soil D is loosened by the rotation of the spiral blades 462 of the rotor, and the washing water spreads to the back of the contaminated soil D. The efficiency of removing the small particle size material from the soil D can be improved. Here, the winding direction of the spiral blade 462 of the rotor is such that only one of the three rotors is in the reverse direction, and the contaminated soil D is unilaterally moved in the longitudinal direction of the shaft. Is preventing.

  There is a contaminated water discharge port 60 on the side surface near the bottom of the treatment tank 11. When there is no need to discharge the contaminated water discharge port 60, the discharge of the contaminated water W is stopped using the sealing plug 61. To do. In this case, the contaminated water W is accumulated in the lower part of the treatment tank 11. If drainage is necessary, open the sealing plug 61 and feed the contaminated water W directly or by connecting piping or hoses to the contaminated water treatment device or in a container such as a drum can. Try to inject.

  Here, with respect to the remainder (remaining soil) from which the soil having a small particle size is removed from the contaminated soil D, the intermediate tank 12 and the upper lid 20 are removed, and a take-out mechanism (power shovel, vacuum pump, container upside down mechanism, etc.) not shown is used. And take it out. Desirably, it can be used for landfill if the radiation dose is below a predetermined value. If not, dispose of by appropriate methods such as incineration or storage in designated areas.

  After that, it is possible to supply the contaminated soil D again and continue the processing. However, when the filter 40 is clogged, the high pressure for cleaning the filter provided below the filter 40 is used. Clogging can be eliminated by jetting high-pressure water from the water jet section 50.

  In addition, the contaminated soil cleaning apparatus of the present invention preferably has an external dimension that allows it to be mounted on a truck bed and transported in a state in which the contaminated soil is incorporated, but is not limited thereto, and may be larger depending on the use environment. Or small.

  In the above description, the contaminated soil cleaning apparatus according to the present invention includes the processing tank 11 and the intermediate tank 12 as the cleaning tank 10. This is because the intermediate tank 12 is provided with the high-pressure water injection unit 30, so that the splitable intermediate tank 12 is provided so as not to hinder the supply of the contaminated soil D. If it does not hinder the supply of the contaminated soil D, the treatment tank 11 and the intermediate tank 12 may be integrated to form the cleaning tank 10. In this case, the supply of the contaminated soil D and the removal of the remaining soil are performed by the upper lid 20. There are also advantages such as reducing the number of members and shortening the detachment time.

  The method of connecting the processing tank 11, the intermediate tank 12 (or the integral cleaning tank 10), the upper lid 20, and the like is to use bolts, nuts, and rubber packing, but is not limited to this. A structure may be used, and other gap filling methods may be used without depending on rubber packing, or depending on the structure, no gap filling may be used. In either case, it is only necessary that substantially sealing can be achieved.

  Moreover, the partition plate 70 is provided in order to mount the filter 40. Thereby, the filter 40 can be simply installed only by mounting on the partition plate 70 if the outer dimensions are appropriately selected. However, the filter 40 may be directly fixed to the treatment tank 11 without using the partition plate 70 depending on the situation. Although the installation is slightly complicated, there is an advantage that the number of members is reduced and the manufacturing cost is reduced.

  Next, another embodiment of the present invention will be described below with reference to the accompanying drawings.

  FIG. 5 is an explanatory diagram of a contaminated soil cleaning system 100 according to another embodiment of the present invention. The contaminated soil cleaning system 100 includes a contaminated soil cleaning device 1 and a waste water treatment device 2. The contaminated soil cleaning apparatus 1 is placed on a table 90, and the contaminated soil cleaning apparatus 1 and the wastewater treatment apparatus 2 are connected by a pipe 80. The contaminated soil cleaning apparatus 1 has been described in detail in one embodiment of the present invention.

  FIG. 6 is a perspective view of the wastewater treatment apparatus 2 that is a part of the contaminated soil cleaning system 100, and FIG. 7 is a schematic cross-sectional view of the wastewater treatment apparatus 2.

  The configuration of the wastewater treatment apparatus 2 is provided in a treatment tank 102 for treating wastewater, an intermediate tank 103 that is coupled to the treatment tank 102 in an airtight state, an upper lid 104 that is coupled to the intermediate tank 103 in an airtight state, and an upper lid 104. A wastewater injection hole 143 that can maintain an airtight state, a gelling agent introduction hole 144 that is provided in the upper lid 104 and can maintain an airtight state, and a blower hole 145 that is provided in the upper lid 104 and can maintain an airtight state. And an exhaust hole 146 provided in the upper lid 104 and capable of maintaining an airtight state.

  The operation of the wastewater treatment apparatus 2 is performed by the wastewater injected from the wastewater injection hole 143 and the gelling agent introduced from the gelling agent introduction hole 144 in the treatment tank 102 in this apparatus kept in an airtight state. Then, gelled wastewater is formed, and moisture is vaporized by blowing air from the air blowing hole 145, and vaporized water vapor is exhausted to the exhaust hole 146. At that time, since harmful substances vaporized together with moisture are also introduced only to the exhaust hole 146, emission into the atmosphere can be prevented by appropriately performing the subsequent processing.

  As disclosed in Patent Document 2, the gelling agent is preferably composed of a porous earth and an acrylic polymer such as sodium polyacrylate, and by introducing it into waste water. The waste water becomes a gel, and then the gelling waste water is vaporized to allow the gelling agent to receive the waste water again to be gelled. Can be greatly reduced.

  The waste water treatment apparatus 2 which is a part of the present invention may further have a glycol introduction hole 147 for introducing glycols to the upper lid 104, whereby the gelled waste water is less resorbed by moisture. , A stable solid can be obtained.

  In the wastewater treatment apparatus 2 which is a part of the present invention, the intermediate tank 103 provided between the upper lid 104 and the treatment tank 102 is not essential, and the treatment tank 102 and the upper lid 104 may be directly coupled. .

Here, the operation of the contaminated soil cleaning system of the present invention will be described.
Contaminated water containing radioactive substances generated by the contaminated soil cleaning apparatus 1 is injected from the contaminated water discharge port 60 into the waste water injection hole 143 of the waste water treatment apparatus 2 via the pipe 80. Since the contaminated soil cleaning apparatus 1 is placed on the cradle 90, it is possible to inject contaminated water without requiring any power.

  In the wastewater treatment apparatus 2, the contaminated water is gelled as described in the operation of the wastewater treatment apparatus 2, and becomes a solid matter with little moisture reabsorption.

  In this way, since the contaminated soil cleaning device 1 and the wastewater treatment device 2 are connected by the pipe 80, consistent processing from the contaminated soil injection to the solidification of the contaminated water is performed in an almost sealed environment. can do.

  In addition, about the waste water treatment apparatus 2, the technique is disclosed by patent document 3 in detail. However, the structure is not limited to what has been described so far and described in Patent Document 3, and the structure is different if it is a device that can treat contaminated water (waste water) using a gelling agent. May be.

  In addition, the contaminated soil cleaning apparatus 1 is placed on the table 90, and the contaminated soil cleaning apparatus 1 and the wastewater treatment apparatus 2 are connected by the pipe 80. However, the present invention is not limited to the pipe, and may be a hose. The contaminated soil cleaning device 1 may be placed at the same height as the wastewater treatment device 2 without being placed on the table 90, and a power device such as a pump may be provided between them as necessary. In any installation form, an additional filter may be provided in the middle. Further, after being accumulated in a container such as a drum can from the contaminated soil cleaning apparatus 1, it may be injected into the wastewater treatment apparatus 2. Even when not directly connected, it is possible to prevent leakage of radioactive material, as in the case of sealing, if an appropriate transport means is selected. In some cases, the system can be realized more simply than in the case of direct connection.

  FIG. 8 shows a contaminated soil cleaning system 200 according to still another embodiment of the present invention, which is a system in which a surface tension lowering agent addition unit 3 and a high-pressure water supply unit 4 are added to the contaminated soil cleaning apparatus 1 shown in FIG. is there.

  The surface tension reducing agent adding unit 3 includes a substantially rectangular parallelepiped container 301 having a bottom, a cleaning water injection unit 302 for injecting cleaning water into the container, a cleaning water discharge unit 303 for discharging cleaning water from the container, and the vicinity of the cleaning water discharge unit 303 The faucet 304 that can stop the discharge of the cleaning water, the surface tension reducing agent solution injection part 305 that injects the surface tension reducing agent solution into the container, and the surface tension reducing agent solution and the cleaning water are stirred in the container. A stirring unit 306 is provided. The agitating unit 306 may be, for example, a structure in which a blade-like portion is added to a rotating shaft and agitated by rotating the shaft. Further, if the dissolution of the surface tension reducing agent proceeds without stirring, the stirring portion 306 can be eliminated.

  Here, the surface tension reducing agent is preferably a surfactant, for example, a hydrocarbon surfactant, a silicone surfactant, a fluorine surfactant, and the like. In particular, the fluorine surfactant has a surface tension lowering effect. Is more preferable. The fluorosurfactant is a general term for surfactants having a fully fluorinated fluorocarbon chain (perfluorocarbon chain) as a hydrophobic group, not a hydrocarbon chain. In particular, those containing a perfluoroalkyl group, for example, Surflon (registered trademark) of AGC Seimi Chemical Co., Ltd. are most desirable. In addition to these, fluorine-containing surfactants FC-4430 and FC-4432 (trade names) manufactured by 3M Japan are included as those containing a perfluoroalkyl group, and fluorine-containing compounds that do not contain a perfluoroalkyl group. Surfactants such as Neos's footgent (trade name) can also be used. In any case, the surface tension can be lowered by adding a small amount.

In the surface tension reducing agent adding section 3, the surface tension reducing agent is added to the cleaning water in the following procedure.
1) Dissolve the surface tension lowering agent with a small amount of water in advance (primary dissolution). In the case of the exemplified surface tension lowering agent, the ratio is preferably 10 to 100.
2) Add a very small amount of a substance that promotes dissolution (eg, nonionic surfactant, butyl glycol ether, etc.).
3) Water (surface tension depressant solution) in which the surface tension depressant is dissolved is added to the washing water from the surface tension depressant solution charging unit 305 (secondary dissolution), and stirred by the stirring unit 306.

  Note that the procedure for adding the surface tension reducing agent to the washing water is not limited to the above description, and corresponding to the selected surface tension reducing agent, the dissolution ratio at the time of primary dissolution, the direct washing water without primary dissolution. What is necessary is just to determine suitably procedures, such as adding to.

  The washing water to which the surface tension reducing agent solution has been added is sent to the inlet 401 of the high-pressure water supply unit 4, and after the pressure is increased in the high-pressure water supply unit 4, the outlet 402 of the high-pressure water supply unit 4. Is sent to the contaminated soil cleaning apparatus 1. As the high-pressure water supply unit 4, a commercially available high-pressure washing machine or the like may be used. However, the high-pressure water supply unit 4 may be designed exclusively, or may be configured integrally with the surface tension lowering agent addition unit 3.

  In the contaminated soil cleaning apparatus 1, the surface tension reducing agent added to the cleaning water can reduce the inhibition of penetration due to the surface tension on the surface of the contaminated soil D, and the cleaning water penetrates into the contaminated soil. Enable. Thereby, it becomes possible to remove more substances with small particle diameters from the contaminated soil D, and an efficient contaminated soil cleaning system can be realized.

DESCRIPTION OF SYMBOLS 1 Contaminated soil washing | cleaning apparatus 10 Cleaning tank 11 Treatment tank 12 Intermediate tank 20 Upper lid 30 High pressure water injection part 40 Filter 50 High pressure water injection part 60 Contaminated water discharge port 70 Partition plate 80 Pipe 100 Contaminated earth washing system 2 Waste water treatment apparatus 200 Contaminated earth Cleaning system 3 Surface tension depressant addition part 4 High-pressure water supply part

  The present invention generally relates to an apparatus for cleaning soil containing contaminants, and more particularly to an apparatus and system for cleaning radioactive contaminated soil in a sealed state.

  Decontamination of contaminated soil, especially decontamination of soil contaminated with radioactive materials, has become an extremely important issue for the recovery of nuclear power plant disasters. Here, if there is an apparatus that can remove only the radioactive substance adhering to the contaminated soil by washing it with a liquid such as water, the subsequent processing becomes easy.

  As such an apparatus, as described in Patent Document 1, the technical idea of an apparatus for supplying contaminated soil onto a sieve and injecting high-pressure water therein to wash the contaminated soil is disclosed. .

  Moreover, about the process of the wastewater containing the pollutant after washing | cleaning, the technical idea of the wastewater treatment method which solidifies wastewater using the gelatinizer as described in patent document 2 is disclosed. Furthermore, Patent Document 3 discloses a technical idea of a wastewater treatment apparatus that executes such a treatment method in a substantially sealed state.

JP 2005-279454 A Japanese Patent No. 5175378 Japanese Patent Application No. 2014-045783

  However, according to the apparatus described in Patent Document 1, the pollutants that are the target of the contaminated soil are heavy metals, oils, and dioxins, not radioactive materials that require special handling, and wastewater that contains pollutants after washing. After being filtered, it is discharged into the sewer or reused for cleaning. This also has a problem when a radioactive material requiring special handling is targeted.

Therefore, an object of the present invention is to provide a safe and efficient radioactive contaminated soil cleaning apparatus and system that enables handling suitable for radioactive materials when cleaning contaminated soil containing radioactive materials. .

The present invention is a radioactively contaminated soil cleaning apparatus for cleaning soil containing radioactive contaminants to solve the above-described problems ,
A) A washing tank having a bottom and side surfaces in a substantially sealed state, the upper part being open, and washing radioactive contaminated soil inside,
B) An upper lid that is open at the bottom and connects the bottom and the top of the washing tank in a sealable manner;
C) a first high-pressure water injection unit provided at the top inside the cleaning tank;
D) a filter that is provided below the first high-pressure water injection unit inside the cleaning tank and on which radioactive contaminated soil can be placed;
E) A radioactive polluted water discharge port provided below the filter inside the washing tank, and in a substantially sealed state, the radioactive polluted soil placed above the filter from the first high-pressure water injection unit injecting high-pressure water, radioactive contaminants which can pass through the filter leading to the filter downward, and wherein the discharging radioactive contaminated water outlet.

  According to this, the radioactive substance adhering to the contaminated soil is removed by high-pressure water, and in particular, the radioactive substance having a small particle diameter passes through the filter and is discharged from the discharge port as contaminated water, and comprises a washing tank and an upper lid. Since the whole can be in a substantially sealed state, that is, in a sealed state except for entrances and exits such as soil and water, the risk of scattering of radioactive materials can be minimized.

Moreover, the radioactively contaminated soil cleaning apparatus of the present invention further comprises:
F) It is good also as having the stirring part which is provided above a filter inside a washing tank and stirs radioactive contaminated soil. According to this, cleaning water spreads to the depths of radioactively contaminated soil, and the cleaning effect is enhanced.

Moreover, the radioactively contaminated soil cleaning apparatus of the present invention further comprises:
G) It is good also as having the partition plate which is provided under the filter and mounts a filter inside a washing tank. According to this, since the partition plate for placing the filter is provided, the filter can be easily installed.

Moreover, the radioactively contaminated soil cleaning apparatus of the present invention further comprises:
H) It is also characterized by having a second high-pressure water injection unit for injecting high-pressure water for cleaning the filter, provided below the partition plate inside the cleaning tank and above the radioactively contaminated water discharge port. Good. According to this, since high-pressure water for cleaning the filter can be jetted, it can be used for a long time.

Moreover, the radioactively contaminated soil cleaning apparatus of the present invention may be characterized in that the cleaning tank is separated into an upper intermediate tank and a lower processing tank.

  According to this, for example, by providing the first high-pressure water injection unit in the intermediate tank and providing the filter or the like in the treatment tank, it is possible that the treatment of the residual contaminated soil after the radioactive substance removal is facilitated.

In another this invention, it is a radioactive contaminated soil washing | cleaning system containing the radioactive contaminated soil washing | cleaning apparatus of this invention, and the wastewater treatment apparatus using a gelatinizer.

According to this, it becomes possible to perform a series of operations of processing the radioactive contaminated water discharged from the radioactive contaminated soil washing device by the waste water treatment device and solidifying it, purifying the radioactive contaminated water, and discharging it to the sewer. Processing with a high risk is unnecessary.

In another aspect of the present invention, the radioactive contaminated soil cleaning apparatus of the present invention, a high-pressure water supply unit for supplying high-pressure water for cleaning radioactive contaminated soil, and a surface tension for adding a surface tension reducing agent to the high-pressure water A radioactive contaminated soil cleaning system including a depressant addition part.

According to this, by reducing the surface tension of the radioactive contaminated soil, it is possible to reduce the inhibition of penetration of radioactive contaminated soil surface, washing water to the inside radioactive contaminated soil is it possible to penetrate. As a result, it becomes possible to remove more substances having a small particle diameter from the contaminated soil, and an efficient radioactive contaminated soil cleaning system is obtained.

According to the radioactively contaminated soil cleaning apparatus of the present invention, the radioactive material contained in the radioactively contaminated soil is removed by the cleaning water in a substantially sealed state, so that the risk of exposure to radioactive materials and the like is minimized. Can be performed safely and efficiently.

Moreover, according to the radioactive contaminated soil washing | cleaning system of this invention, from washing | cleaning of radioactive contaminated soil to solidification processing of radioactive contaminated water can be implemented consistently, and high efficiency can be acquired.

It is a perspective view of the radioactive contamination soil washing | cleaning apparatus of one Embodiment of this invention. It is sectional drawing of the radioactive contamination soil washing | cleaning apparatus of one Embodiment of this invention. It is a perspective view containing the stirring part of the radioactive contamination soil washing | cleaning apparatus of one Embodiment of this invention. It is a top view of the stirring part used for the radioactive contamination soil washing | cleaning apparatus of one Embodiment of this invention. It is explanatory drawing of the radioactive contamination soil washing | cleaning system of another embodiment of this invention. It is a one part perspective view of the radioactive contamination soil washing | cleaning system of another embodiment of this invention. It is typical sectional drawing of a part of radioactive contamination soil washing | cleaning system of another embodiment of this invention. It is explanatory drawing of the radioactive contamination soil washing | cleaning system of further another embodiment of this invention.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a perspective view of a radioactive contaminated soil cleaning apparatus 1 according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of the radioactive contaminated soil cleaning apparatus 1 according to an embodiment of the present invention.

  It has the washing tank 10 which performs the washing process of contaminated soil, and the upper cover 20 connected with the upper part of a washing tank so that sealing is possible. Here, the cleaning tank 10 is divided into a lower processing tank 11 and an upper intermediate tank 12. The processing tank 11 and the intermediate tank 12, and the intermediate tank 12 and the upper lid 20 are detachably connected to each flange portion by bolts and nuts. Moreover, in order to ensure the airtightness between these, a rubber packing is used suitably.

  A high-pressure water supply pipe 31 is inserted into the intermediate tank 12 on the side surface of the intermediate tank 12, and high-pressure water is sent to the high-pressure water supply pipe 31 from a high-pressure water supply unit (not shown). The high-pressure water supply pipe 31 is provided with a plurality of openings 32 for injecting high-pressure water downward, and the (first) high-pressure water injection part 30 is configured by the high-pressure water supply pipe 31 and the openings 32. The

  Here, a commercially available high-pressure washing machine or the like may be used as the high-pressure water supply unit. It is desirable that the pressure and flow rate can be adjusted, and it is desirable that the pressure is about 8 to 12 MPa at the maximum. However, the pressure is not limited to this. Even things can be used.

  A mesh-like partition plate 70 is fixed above the processing tank 11. The partition plate 70 is preferably a corrosion-resistant metal, but may be made of other materials. The shape is not limited to a mesh shape, and may be any shape that does not hinder the passage of a substance having a small particle diameter, such as a sawtooth shape. On the partition plate 70, four layers of filters 40a, 40b, 40c, and 40d (generally 40) made of fine non-hydrous fibers are placed. Of the four layers, the uppermost layer 40a and the lowermost layer 40d are made of a slightly rough mesh made of stainless steel, and the intermediate two layers 40b and 40c are made of polypropylene fibers, slightly finer, different or the same. Of the mesh. Here, polypropylene is used because it is non-water-containing in resin and does not cause changes in dimensions and performance due to moisture absorption during use, but other substances may be used depending on the situation. Can be used.

  Further, below the partition plate 70, a high-pressure water supply pipe 52 for cleaning the filter 40 is inserted into the treatment tank 11 from the side surface of the treatment tank 11, and the high-pressure water supply pipe 51 is pressurized from a high-pressure water supply unit (not shown). Water is sent. The high-pressure water supply pipe 51 is provided with a plurality of openings 52 for injecting high-pressure water upward, and the (second) high-pressure water injection part 50 is configured by the high-pressure water supply pipe 51 and the openings 52. The

  A contaminated water discharge port 60 for discharging the contaminated water W treated in the treatment tank 11 is provided on the side surface near the lowermost part of the treatment tank 11, and from here, a pipe or a hose is connected directly. Thus, the contaminated water W is guided to the next process. In addition, in the vicinity of the contaminated water discharge port 60, there is a sealing plug 61 having a screwing structure for preventing leakage, which can close the discharge port.

Note that a stirring unit for stirring the contaminated soil may be provided above the four-layer filter 40. FIG. 3 is a perspective view including the stirring unit 45 of the radioactive contaminated soil cleaning apparatus 1 according to the embodiment of the present invention. FIG. 4 is a plan view of the stirring unit 45 used in the radioactively contaminated soil cleaning apparatus according to the embodiment of the present invention. The stirring unit 45 is composed of three metal (preferably stainless steel) stirring rotors 46 each having a spiral blade 462 attached to a shaft 461, a housing 47 for rotatably holding them, and the stirring rotor 46. It comprises a drive transmission unit 48 that is driven to rotate by an external drive source (not shown). Here, the winding direction of the spirals of the three stirring rotors 46 is opposite to the central one, and the efficiency of stirring the contaminated soil is improved. Only one of the parts may be in the reverse direction. Further, the number of stirring rotors 46 is not limited to three, and may be one or more. Further, the agitation unit 45 is not limited to the structure and shape of the contaminated soil agitation rotor shown in the figure, and may be a rotating mechanism, one that applies vibration, one that blows gas or liquid, etc. Any scheme or structure may be used.

The operation of the radioactively contaminated soil cleaning apparatus 1 having such a configuration will be described.
First, the upper lid 20 and the intermediate tank 12 are removed from the processing tank 11. With the upper side of the processing tank 11 open, the contaminated soil D contaminated with radioactive material on the filter 40 placed on the partition plate 70 is supplied to a supply mechanism (conveyor, power, not shown). Supplied by a shovel).

  Next, the intermediate tank 12 and the upper lid 20 are placed on the processing tank 11, and they are joined in a substantially hermetically sealed state using bolts, nuts, rubber packing, and the like.

  Next, high pressure water is ejected downward from the high pressure water injection unit 30 provided in the intermediate tank 12. As a result, the substances M2, M3, M4, and M5 having a relatively fine particle size attached to the contaminated soil D are removed. Radioactive materials are also included as such fine particle size materials.

  The removed substances (including radioactive substances) M2-M5 pass through the four-layer filter 40 placed on the partition plate 70 provided in the treatment tank 11 together with the washing water, and the particle size at that time M1 having a large particle size (containing almost no radioactive substance) cannot pass through the filter 40, and a substance having a small particle size (containing a large amount of radioactive substance) passes through the filter 40 and the coarser partition plate 70, It is dropped to the bottom of the treatment tank 11.

  In addition, when the stirring part 45 is provided in the upper part of the four-layer filter 40, the contaminated soil D is loosened by the rotation of the spiral blades 462 of the rotor, and the washing water spreads to the back of the contaminated soil D. The efficiency of removing the small particle size material from the soil D can be improved. Here, the winding direction of the spiral blade 462 of the rotor is such that only one of the three rotors is in the reverse direction, and the contaminated soil D is unilaterally moved in the longitudinal direction of the shaft. Is preventing.

  There is a contaminated water discharge port 60 on the side surface near the bottom of the treatment tank 11. When there is no need to discharge the contaminated water discharge port 60, the discharge of the contaminated water W is stopped using the sealing plug 61. To do. In this case, the contaminated water W is accumulated in the lower part of the treatment tank 11. If drainage is necessary, open the sealing plug 61 and feed the contaminated water W directly or by connecting piping or hoses to the contaminated water treatment device or in a container such as a drum can. Try to inject.

  Here, with respect to the remainder (remaining soil) from which the soil having a small particle size is removed from the contaminated soil D, the intermediate tank 12 and the upper lid 20 are removed, and a take-out mechanism (power shovel, vacuum pump, container upside down mechanism, etc.) not shown is used. And take it out. Desirably, it can be used for landfill if the radiation dose is below a predetermined value. If not, dispose of by appropriate methods such as incineration or storage in designated areas.

  After that, it is possible to supply the contaminated soil D again and continue the processing. However, when the filter 40 is clogged, the high pressure for cleaning the filter provided below the filter 40 is used. Clogging can be eliminated by jetting high-pressure water from the water jet section 50.

In addition, the radioactive contaminated soil cleaning apparatus of the present invention preferably has an external dimension that can be mounted on a truck bed and transported in a state in which the contaminated soil is incorporated, but is not limited thereto, and may further depend on the use environment. It can be large or small.

In the above description, the radioactively contaminated soil cleaning apparatus of the present invention is composed of two parts, that is, a processing tank 11 and an intermediate tank 12 as the cleaning tank 10. This is because the intermediate tank 12 is provided with the high-pressure water injection unit 30, so that the splitable intermediate tank 12 is provided so as not to hinder the supply of the contaminated soil D. If it does not hinder the supply of the contaminated soil D, the treatment tank 11 and the intermediate tank 12 may be integrated to form the cleaning tank 10. In this case, the supply of the contaminated soil D and the removal of the remaining soil are performed by the upper lid 20. There are also advantages such as reducing the number of members and shortening the detachment time.

  The method of connecting the processing tank 11, the intermediate tank 12 (or the integral cleaning tank 10), the upper lid 20, and the like is to use bolts, nuts, and rubber packing, but is not limited to this. A structure may be used, and other gap filling methods may be used without depending on rubber packing, or depending on the structure, no gap filling may be used. In either case, it is only necessary that substantially sealing can be achieved.

  Moreover, the partition plate 70 is provided in order to mount the filter 40. Thereby, the filter 40 can be simply installed only by mounting on the partition plate 70 if the outer dimensions are appropriately selected. However, the filter 40 may be directly fixed to the treatment tank 11 without using the partition plate 70 depending on the situation. Although the installation is slightly complicated, there is an advantage that the number of members is reduced and the manufacturing cost is reduced.

  Next, another embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 5 is an explanatory diagram of a radioactive contaminated soil cleaning system 100 according to another embodiment of the present invention. The radioactively contaminated soil cleaning system 100 includes a radioactively contaminated soil cleaning device 1 and a wastewater treatment device 2. The radioactive contaminated soil cleaning apparatus 1 is placed on a table 90, and the radioactive contaminated soil cleaning apparatus 1 and the wastewater treatment apparatus 2 are connected by a pipe 80. The radioactive contaminated soil cleaning apparatus 1 has been described in detail in one embodiment of the present invention.

FIG. 6 is a perspective view of the wastewater treatment apparatus 2 that is a part of the radioactive contaminated soil cleaning system 100, and FIG. 7 is a schematic cross-sectional view of the wastewater treatment apparatus 2.

  The configuration of the wastewater treatment apparatus 2 is provided in a treatment tank 102 for treating wastewater, an intermediate tank 103 that is coupled to the treatment tank 102 in an airtight state, an upper lid 104 that is coupled to the intermediate tank 103 in an airtight state, and an upper lid 104. A wastewater injection hole 143 that can maintain an airtight state, a gelling agent introduction hole 144 that is provided in the upper lid 104 and can maintain an airtight state, and a blower hole 145 that is provided in the upper lid 104 and can maintain an airtight state. And an exhaust hole 146 provided in the upper lid 104 and capable of maintaining an airtight state.

  The operation of the wastewater treatment apparatus 2 is performed by the wastewater injected from the wastewater injection hole 143 and the gelling agent introduced from the gelling agent introduction hole 144 in the treatment tank 102 in this apparatus kept in an airtight state. Then, gelled wastewater is formed, and moisture is vaporized by blowing air from the air blowing hole 145, and vaporized water vapor is exhausted to the exhaust hole 146. At that time, since harmful substances vaporized together with moisture are also introduced only to the exhaust hole 146, emission into the atmosphere can be prevented by appropriately performing the subsequent processing.

  As disclosed in Patent Document 2, the gelling agent is preferably composed of a porous earth and an acrylic polymer such as sodium polyacrylate, and by introducing it into waste water. The waste water becomes a gel, and then the gelling waste water is vaporized to allow the gelling agent to receive the waste water again to be gelled. Can be greatly reduced.

  The waste water treatment apparatus 2 which is a part of the present invention may further have a glycol introduction hole 147 for introducing glycols to the upper lid 104, whereby the gelled waste water is less resorbed by moisture. , A stable solid can be obtained.

  In the wastewater treatment apparatus 2 which is a part of the present invention, the intermediate tank 103 provided between the upper lid 104 and the treatment tank 102 is not essential, and the treatment tank 102 and the upper lid 104 may be directly coupled. .

Here, the operation of the radioactively contaminated soil cleaning system of the present invention will be described.
The contaminated water containing the radioactive substance generated by the radioactively contaminated soil cleaning apparatus 1 is injected from the contaminated water discharge port 60 into the wastewater injection hole 143 of the wastewater treatment apparatus 2 via the pipe 80. Since the radioactive contaminated soil cleaning apparatus 1 is mounted on the cradle 90, it is possible to inject contaminated water without requiring any power.

  In the wastewater treatment apparatus 2, the contaminated water is gelled as described in the operation of the wastewater treatment apparatus 2, and becomes a solid matter with little moisture reabsorption.

In this way, since the radioactive contaminated soil cleaning device 1 and the wastewater treatment device 2 are connected by the pipe 80, a consistent process from the contaminated soil injection to the solidification of the contaminated water is performed in an almost sealed environment. Can be executed.

  In addition, about the waste water treatment apparatus 2, the technique is disclosed by patent document 3 in detail. However, the structure is not limited to what has been described so far and described in Patent Document 3, and the structure is different if it is a device that can treat contaminated water (waste water) using a gelling agent. May be.

In addition, the radioactive contaminated soil cleaning apparatus 1 is placed on the table 90, and the radioactive contaminated soil cleaning apparatus 1 and the wastewater treatment apparatus 2 are connected by the pipe 80. The radioactive contaminated soil cleaning apparatus 1 may be placed at the same height as the wastewater treatment apparatus 2 without being placed on the table 90, and a power device such as a pump may be provided between them as necessary. In addition, in any installation form, an additional filter may be provided in the middle. Further, after being accumulated in a container such as a drum can from the radioactive contaminated soil cleaning apparatus 1, it is injected into the wastewater treatment apparatus 2. May be. Even when not directly connected, it is possible to prevent leakage of radioactive material, as in the case of sealing, if an appropriate transport means is selected. In some cases, the system can be realized more simply than in the case of direct connection.

FIG. 8 shows a radioactive contaminated soil cleaning system 200 according to still another embodiment of the present invention, in which a surface tension lowering agent adding unit 3 and a high-pressure water supply unit 4 are added to the radioactive contaminated soil cleaning device 1 shown in FIG. System.

  The surface tension reducing agent adding unit 3 includes a substantially rectangular parallelepiped container 301 having a bottom, a cleaning water injection unit 302 for injecting cleaning water into the container, a cleaning water discharge unit 303 for discharging cleaning water from the container, and the vicinity of the cleaning water discharge unit 303 The faucet 304 that can stop the discharge of the cleaning water, the surface tension reducing agent solution injection part 305 that injects the surface tension reducing agent solution into the container, and the surface tension reducing agent solution and the cleaning water are stirred in the container. A stirring unit 306 is provided. The agitating unit 306 may be, for example, a structure in which a blade-like portion is added to a rotating shaft and agitated by rotating the shaft. Further, if the dissolution of the surface tension reducing agent proceeds without stirring, the stirring portion 306 can be eliminated.

  Here, the surface tension reducing agent is preferably a surfactant, for example, a hydrocarbon surfactant, a silicone surfactant, a fluorine surfactant, and the like. In particular, the fluorine surfactant has a surface tension lowering effect. Is more preferable. The fluorosurfactant is a general term for surfactants having a fully fluorinated fluorocarbon chain (perfluorocarbon chain) as a hydrophobic group, not a hydrocarbon chain. In particular, those containing a perfluoroalkyl group, for example, Surflon (registered trademark) of AGC Seimi Chemical Co., Ltd. are most desirable. In addition to these, fluorine-containing surfactants FC-4430 and FC-4432 (trade names) manufactured by 3M Japan are included as those containing a perfluoroalkyl group, and fluorine-containing compounds that do not contain a perfluoroalkyl group. Surfactants such as Neos's footgent (trade name) can also be used. In any case, the surface tension can be lowered by adding a small amount.

In the surface tension reducing agent adding section 3, the surface tension reducing agent is added to the cleaning water in the following procedure.
1) Dissolve the surface tension lowering agent with a small amount of water in advance (primary dissolution). In the case of the exemplified surface tension lowering agent, the ratio is preferably 10 to 100.
2) Add a very small amount of a substance that promotes dissolution (eg, nonionic surfactant, butyl glycol ether, etc.).
3) Water (surface tension depressant solution) in which the surface tension depressant is dissolved is added to the washing water from the surface tension depressant solution charging unit 305 (secondary dissolution), and stirred by the stirring unit 306.

  Note that the procedure for adding the surface tension reducing agent to the washing water is not limited to the above description, and corresponding to the selected surface tension reducing agent, the dissolution ratio at the time of primary dissolution, the direct washing water without primary dissolution. What is necessary is just to determine suitably procedures, such as adding to.

The washing water to which the surface tension reducing agent solution has been added is sent to the inlet 401 of the high-pressure water supply unit 4, and after the pressure is increased in the high-pressure water supply unit 4, the outlet 402 of the high-pressure water supply unit 4. Is sent to the radioactively contaminated soil cleaning apparatus 1. As the high-pressure water supply unit 4, a commercially available high-pressure washing machine or the like may be used. However, the high-pressure water supply unit 4 may be designed exclusively, or may be configured integrally with the surface tension lowering agent addition unit 3.

In the radioactive contaminated soil cleaning apparatus 1, the surface tension reducing agent added to the cleaning water can reduce the inhibition of penetration due to the surface tension on the surface of the contaminated soil D, and the cleaning water penetrates into the contaminated soil. Make it possible. Thereby, it becomes possible to remove more substances having a small particle diameter from the contaminated soil D, and an efficient radioactive contaminated soil cleaning system can be realized.

DESCRIPTION OF SYMBOLS 1 Radioactive contaminated soil washing | cleaning apparatus 10 Cleaning tank 11 Treatment tank 12 Intermediate tank 20 Upper lid 30 High pressure water injection part 40 Filter 50 High pressure water injection part 60 Contaminated water discharge port 70 Partition plate 80 Piping 100 Radioactive soil washing system 2 Waste water treatment apparatus 200 Radioactive soil cleaning system 3 Surface tension depressant addition unit 4 High pressure water supply unit

Claims (7)

A contaminated soil cleaning device for cleaning soil containing pollutants,
A) a washing tank having a bottom and side surfaces in a substantially sealed state, the top being open, and washing contaminated soil inside;
B) An upper lid that is open at the bottom and connects the bottom and the top of the washing tank in a sealable manner;
C) a first high-pressure water injection unit provided in the upper part of the cleaning tank;
D) a filter provided inside the cleaning tank below the first high-pressure water injection unit and on which contaminated soil can be placed;
E) The first high-pressure water injection unit on the contaminated soil placed above the filter in a substantially sealed state, having a contaminated water discharge port provided below the filter inside the cleaning tank. The contaminated soil cleaning apparatus is characterized by injecting high-pressure water from the filter, guiding contaminants that can pass through the filter below the filter, and discharging the contaminants from the contaminated water discharge port. The contaminated soil cleaning apparatus according to claim 1, further comprising:
F) A contaminated soil cleaning apparatus having an agitation unit provided inside the cleaning tank and above the filter for agitating the contaminated soil. The contaminated soil cleaning apparatus according to claim 1, further comprising:
G) A contaminated soil cleaning apparatus, comprising a partition plate provided below the filter and mounting the filter inside the cleaning tank. The contaminated soil cleaning apparatus according to claim 1, further comprising:
H) A second high-pressure water injection unit for injecting high-pressure water for cleaning the filter, which is provided inside the cleaning tank and below the partition plate and above the contaminated water discharge port. Contaminated soil cleaning equipment. 2. The contaminated soil cleaning apparatus according to claim 1, wherein the cleaning tank is separated into an upper intermediate tank and a lower processing tank. A contaminated soil cleaning system comprising the contaminated soil cleaning device according to claim 1 and a wastewater treatment device using a gelling agent. The contaminated soil cleaning apparatus according to claim 1, a high-pressure water supply unit that supplies high-pressure water for cleaning the contaminated soil, and a surface tension depressant addition unit for adding a surface tension depressant to the high-pressure water And including contaminated soil cleaning system.

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