KR20200022153A - A method for decontaminating soil with cesium and system for decontaminating soil with cesium - Google Patents

Abstract

Disclosed are a decontamination system for cesium-contaminated soil, and a decontamination method using the same. The decontamination system of the present invention comprises: a washing device for washing the soil contaminated with cesium; a collecting tank for receiving soil washed by the washing device and contaminated water; a plurality of sedimentation tanks stepwisely storing and overflowing the contaminated water overflown from the collecting tank and soil contained in the contaminated water so as to flow out the same; and a cesium adsorption means adsorbing cesium contained in contaminated water flowing through the plurality of sedimentation tanks from the collecting tank using Prussian.

Description

FIELD OF DECONTAMINATING SOIL WITH CESIUM AND SYSTEM FOR DECONTAMINATING SOIL WITH CESIUM

The present invention relates to a method and system for decontaminating radioactive cesium, and more particularly, to a method and system for decontaminating soil contaminated with radioactive cesium.

The accident of the Tokyo Electric Power Fukushima Daiichi Nuclear Power Plant caused by the Great East Japan Earthquake in March 2011 caused harmful radioactive materials to be scattered throughout the region, contaminating cities, rice fields, forests, seas, lakes and rivers. In addition, radioactive materials have been favored or deposited on people and animals and plants, exposing their lives to danger, and causing severe damage to various industrial activities such as agriculture, forestry, stock raising, and fishing.

The main radioactive materials from nuclear plant accidents are radioactive iodine and radioactive cesium. Radioactive iodine has a relatively short half-life of about 8 days, whereas radioactive cesium has a very long half-life of 30 years. Cesium has similar chemical properties to potassium and is concentrated in muscles when absorbed, resulting in immune deficiency and various cancers (fertility, bone marrow cancer, lung cancer, thyroid gland). Cancer, breast cancer, etc.).

These radioactive cesium has been found to adsorb to the soil and contaminate the surface of the earth extensively. Such radioactive cesium is not easily recovered because it is strongly bound to clay, organic matter, inorganic matter, and the like. Such extensively contaminated soils are difficult to access not only to agricultural workers, but also to the general public, and to limit industrial activities as well as general living environment.

Therefore, decontaminating a wide range of soils has become a very important task.

Conventionally, as a method of decontaminating soil contaminated with radioactive cesium, there is a method of dissolving contaminated soil in a solvent, separating radioactive material from the solvent, and decontaminating halogenated radioactive waste. At this time, the halide is dissolved in water as a solvent to deposit and recover rare earth elements in the solution, and as a means for separating the non-radioactive material from the solvent, the solvent may be evaporated or cooled to precipitate and deposit the non-radioactive material. See Document 1).

However, in the decontamination method, a method of recovering radioactive materials by dissolving halides in water has a low recovery rate, and a method of evaporating or cooling a solvent requires a heating device or a cooling device, and thus the facility is large and expensive. There is a problem.

In addition, as a method for decontaminating soils, soil contaminated with chemicals derived from the soil is excavated and introduced into a hopper of a heating apparatus, and the soil is denitrated and heated while excluding oxygen to desorb and separate contaminants in the soil (patent). See Document 2).

However, since this decontamination method moves the contaminated soil to an isolated decontamination device and directly heats it, the heating device must be large-scaled, and the minerals and organics in the soil are destroyed in the process of heating to remove contaminants. There is a problem of becoming dead soil. Therefore, there is a problem that cannot be used for agriculture as the decontaminated soil.

Patent Document 1: Japanese Patent Application Laid-Open No. 10-213697 Patent Document 2: Japanese Patent Application Laid-Open No. 5-192648

The present invention has been made in view of the above, and an object of the present invention is to provide a cesium-contaminated soil decontamination method and system capable of effectively decontaminating contaminated soil while maintaining organic and inorganic substances in the soil.

Cesium contaminated soil decontamination method of the present invention for achieving the above object is a soil washing step of decontaminating cesium from the soil by washing the contaminated soil with water; A polluted water collecting step of collecting the polluted water used in the soil washing step; And an adsorption step of adsorbing cesium contained in the contaminated water by passing the collected contaminated water through an adsorption structure surface-treated with Prussian blue.

Thus, the soil contaminated with cesium can be effectively decontaminated through washing, adsorption and combustion processes.

Here, it is preferable to further include a water circulation step of circulating supply so that the water passed through the adsorption step can be reused in the washing step.

As a result, the decontaminated water can be reused, thereby reusing resources and reducing costs.

In addition, the contaminated water measuring step of measuring the degree of contamination of the water passed through the adsorption step; further comprising, repeatedly performing the adsorption step in a plurality of steps until the concentration of cesium in the contaminated water measurement step is less than the reference value good.

This allows safe treated water to be discharged or reused in the cleaning process.

In addition, the washing step, the step of injecting the contaminated soil over the strainer is installed at the inlet of the polluted water collection tank; A water spray step of spraying and washing water into the contaminated soil introduced onto the strainer; And agitation step of stirring the soil and the precipitated soil on the sieve.

Thereby, the cesium adsorbed on the soil can be decontaminated while preserving the inorganic and organic matter of the soil.

Further, in the adsorption step, the contaminated water collected in the collection step overflows and flows to the settling tank, and the adsorption structure is disposed on the transport path of the contaminated water flowing into the settling tank to adsorb cesium from the contaminated water. It is good to decontaminate.

Thus, the cesium of the contaminated water can be adsorbed in the process of naturally flowing the contaminated water, there is an advantage that can be installed in a large capacity and minimize the separate operating power.

In addition, it is preferable that the cesium adsorption member containing Prussia is further installed on the inner wall of the contaminated water collection tank.

Thereby, cesium can be adsorbed and recovered also in a collection tank and a precipitation tank.

In addition, the adsorption structure is installed on the transport path of the contaminated water, it is preferable that the outer surface includes a tile or fiber painted Prussian.

As a result, the adsorbed structure adsorbed cesium can be recycled or easily disposed of.

In addition, the cesium contaminated soil decontamination system of the present invention for achieving the above object, a washing device for washing soil contaminated with cesium; A collecting tank accommodating soil and contaminated water washed by the washing apparatus; A plurality of sedimentation tanks for storing and overflowing the contaminated water and the soil contained in the contaminated water overflowed in the collection tank step by step; And cesium adsorption means for adsorbing cesium contained in the contaminated water flowing through the plurality of precipitation tanks in the collection tank by using Prussian.

Here, it is preferable to further include a precipitation soil stirrer for stirring the soil precipitated in the collection tank.

In addition, the cleaning device, the filtering net is installed at the inlet of the collection tank; A first water spray unit for spraying water onto the contaminated soil supplied to the strainer; A second water spray unit installed to spray water from the bottom of the strainer to the contaminated soil; A connection member connecting the first and second water injection parts; And a water supply pump that pumps and supplies water to the connection member.

In addition, the washing apparatus further includes a drive motor for rotating the connecting member, wherein the first and second water injection portion to each of the upper and lower portions of the contaminated soil placed on the filter net while rotating around the connecting member. It is good to spray water.

In addition, it is preferable to further include a stirrer for stirring the soil precipitated inside the collection tank while being connected to the connection member and rotated.

In addition, the cesium adsorption means is detachably installed in the contaminated water transport path is installed on the movement path of the contaminated water flowing sequentially from the collection tank to the plurality of sedimentation tank, the process to expose the Prussian on the outer surface It is preferable to include the main adsorption structure.

In addition, the main adsorbent structure may include at least one selected from blocks, tiles, and fibers in which Prussian is painted on the surface.

The cesium adsorption means may be detachably installed on at least one inner wall of the collection tank and the settling tank, and further includes a sub adsorption structure surface-treated with Prussian.

In addition, the contaminated water transfer path is inclined so as to connect between the upstream and downstream settling tank, and between the collection tank and the downstream settling tank, the plate-shaped bottom wall and the vertical wall connected to both sides of the bottom wall, respectively. It is preferable that the cesium adsorption means is installed on the bottom surface of the bottom wall to adsorb cesium from the contaminated water flowing through the bottom of the bottom wall.

Thereby, the cesium adsorption structure can be easily exchanged and used.

In addition, it is preferable to further include a cesium concentration measuring sensor installed in each of the plurality of sedimentation tank to measure the contamination state of the contaminated water.

As a result, the degree of contamination can be checked at each treatment stage of the contaminated water to finally discharge safe water.

In addition, when the contaminated state of the contaminated water among the plurality of sedimentation tank satisfies the acceptance standard value, it is preferable to further include a use water circulation device for circulating to the washing device to reuse.

According to the cesium contaminated soil decontamination method and system thereof, the soil contaminated with cesium can be decontaminated while preserving organic matter and inorganic matter.

In addition, the equipment used for decontamination and the decontaminated water can be reused, thus reducing operating costs.

In addition, it is possible to increase the size of the facility can easily improve the treatment capacity of the cesium contaminated soil.

1 is a schematic diagram illustrating a cesium contaminated soil decontamination system according to an embodiment of the present invention.
2 is a cross-sectional view illustrating a state in which a sub adsorption structure is installed in a collection tank (precipitation tank).
3 is a perspective view for explaining a state in which the main adsorption structure is installed on the contaminated water transport path.
4 is a view showing a fiber as an example of the main adsorption structure.
Figure 5 is a schematic diagram illustrating a cesium contaminated soil decontamination system according to another embodiment of the present invention.
Figure 6 is a schematic diagram illustrating a cesium contaminated soil decontamination system according to another embodiment of the present invention.
7 is a schematic diagram illustrating a cesium contaminated soil decontamination method according to an embodiment of the present invention.

Hereinafter, a cesium contaminated soil decontamination method and system according to a preferred embodiment of the present invention with reference to the accompanying drawings will be described in detail.

1 to 4, the cesium soil contamination decontamination system 100 according to an embodiment of the present invention is a washing device 110 for washing soil contaminated with cesium, the soil washed by the washing device 110 And a plurality of sedimentation tanks (131, 132, 133) for collecting and polluting the water contained in the collection tank 120, the polluted water overflowed from the collection tank 120, and the soil contained in the contaminated water in a stepwise manner. Cesium adsorption means 140 for adsorbing cesium contained in the contaminated water flowing through the plurality of settling tanks (131,132) from the tank 120 by using Prussian.

The soil contaminated with cesium is collected in a widely contaminated radioactive contaminated area using a separate collecting device, and the collected contaminated soil is transported to a place for decontamination using a separate transport vehicle, and transported. The contaminated soil may be supplied by a certain amount by a conveyor device so as to be washed by the washing device 110.

The washing apparatus 110 is the first water spraying unit 113 for spraying water to the upper part of the contaminated soil 10 supplied to the sieve 111, the sieve 111 is installed at the inlet of the collecting tank 120. The connecting member 117 and the connecting member connecting the second water spraying unit 115 and the first and second water spraying units 113 and 115 installed to spray water upward from the bottom of the sieve 111. 117 is provided with a water supply pump 119 for pumping water.

Here, the sieve 111 is installed to cover the open upper portion of the collecting tank 120, and serves to filter out a relatively large foreign matter contained in the contaminated soil to be introduced.

The second water spraying unit 115 is positioned at the bottom of the upper part of the strainer 111, and the first water spraying unit 113 is disposed to be spaced apart from the upper portion so as to face the second water spraying unit 115. The first and second water injection parts 113 and 115 are connected to be disposed up and down by the connection member 117. The first water spraying unit 113 sprays water downward to wash the contaminated soil supplied over the sieve 111. In addition, the second water sprayer 115 sprays water from the bottom of the sieve 111 to the top to wash the contaminated soil accumulated in the sieve 111 from the bottom. Therefore, contaminated soil can be washed quickly and uniformly.

The first and second water injection units 113 and 115 may have a configuration having a disk shape, or may have a configuration in which a plurality of wings are radially disposed at regular intervals around the connection member 117.

The connecting member 117 has a hollow shape to supply the first and second water injection parts 113 and 115 through the inside thereof, and is connected coaxially to the driving motor 114 to be rotated in the forward and reverse directions.

Therefore, the second water injection unit 115 may serve to wash the soil on the net 111 while stirring to improve the washing effect.

The water supply pump 119 pumps water from the water storage tank 118 and supplies the high pressure to the first and second water injection units 115 through the connection member 117. The water supply pump 119 is selectively controlled by the control unit 170 to be described later.

The collection tank 120 is mixed with the contaminated water contaminated with cesium by washing the soil and the soil washed by the washing device 110 is stored. The cleaning device 110 is installed, including the strainer 111, on the upper part of the collection tank 120, and the contaminated water overflows to the downstream settling tank 131 through the transport path 150.

Here, it is preferable that a stirrer 112 is further provided to stir the soil, ie, the precipitate, which is deposited on the inner bottom of the collecting tank 120.

The stirrer 112 may have a stirring blade and a stirring shaft, and the stirring shaft may be connected to the connection member 117. Therefore, the stirrer 112 is rotated at a low speed by repeatedly driving in the forward and reverse directions by the driving force of the drive motor 114 for driving the connecting member 117 to prevent the sediment from solidifying, cesium remaining in the soil effectively by water Allow to be cleaned.

The contaminated water overflowed in the collection tank 120 flows sequentially through the transport path 150 to downstream settling tanks 131, 132, and 133.

The sedimentation tanks 131, 132 and 133 may be disposed in plural steps, and when the received contaminated water overflows, the sedimentation tanks 131, 132 and 133 flow along the contaminated water transfer path 150 connecting the sedimentation tanks 131, 132 and 133 to flow to the next sedimentation tank. A cesium measuring sensor 134 is installed in each of the settling tanks 131, 132, and 133 to measure the degree of cesium contamination of the contaminated water, that is, the cesium concentration. The information measured by the cesium measuring sensor 134 is transmitted to the control unit 170 by wire or wireless transmission.

As shown in FIG. 3, the polluted water transport path 150 has a plate-shaped bottom wall 151 and sidewalls 153 protruding from both sides of the bottom wall 151. Since the bottom wall 151 is disposed to be inclined downward, the contaminated water overflowing from the upstream flows naturally downstream, but spreads and spreads in a large area in a thin film form.

The cesium adsorption means 140 has a main adsorption structure 141 is installed in the contaminated water transfer path 150. The main adsorption structure 141 is a tile or block structure, which is detachably installed on the polluted water transport path 150, and Prussian blue is painted on an outer surface thereof. Therefore, cesium contained in the contaminated water flowing upstream may be adsorbed and recovered by the Prussian of the main adsorption structure 151 installed on the bottom wall 151 of the plate shape. Here, the bottom wall 151 may be provided with a mounting portion 155 in the form of a lattice in order to detachably install the main adsorption structure 141. Therefore, the main adsorption structure 141, which is used for a predetermined time and sufficiently adsorbs cesium, may be separated from the lower wall 151 to combust the cesium adsorbed in a separate combustion to be decontaminated. The cesium-removed main adsorption structure 141 may be reused by mounting or mounting the bottom surface 151 after painting or coating Prussian again.

In addition, as shown in FIG. 4, the main adsorption structure 141 may include a fiber body 141 ′ having a predetermined thickness. Prussian blue may be painted or coated on the fibrous body 141 'to be mounted on the mounting part 153 to adsorb cesium contained in contaminated water. The cesium-adsorbed fibrous material is transferred to a combustion device and completely combusted to effectively decontaminate cesium.

Here, the mounting portion 153 may be configured in the form of a lattice, the walls forming the lattice may be formed of a porous material such as a mesh to allow water to pass through.

In addition, referring to FIG. 2, the cesium adsorption means 140 may further include sub adsorption structures 143 and 144 installed on inner walls and bottoms of the collection tank 120 or the settling tanks 131, 132, and 133.

Referring to FIG. 2, the inner wall of the collecting tank 120 is provided with a mounting part 121 for detachably mounting the sub adsorption structure 143 in a lattice form, and the sub adsorption structures 143 and 144 formed in a tile or block shape. Can be installed detachably. The mounting portion 121 may be formed in a hook shape to protrude from the inner wall and the bottom of the collecting tank 120 to support the edges of the sub adsorption structures 143 and 144 so as to be mounted and separated in a one-touch manner. The sub adsorption structures 143 and 144 may be formed of the same material or the same structure as the main adsorption structure 141. Therefore, Prussian, which has been painted or coated on the surfaces of the sub-adsorption structures 143 and 144, serves to adsorb and remove cesium in the collection tank 120.

The sub adsorption structures 143 and 144 which adsorb the cesium may be removed by burning the cesium adsorbed by separating it from the collecting tank 120 and then remounted by surface treatment with Prussian.

Of course, the sub adsorption structures 143 and 144 may include a fiber body surface treated with Prussian.

In addition, the water used in the settling tank (131, 132, 133) according to the polluted state of the contaminated water or circulating to the washing device 110 and the use water circulation device 160 and the use water circulation device 160 to drive It is preferable to further include a control unit 170 for controlling.

The use water circulation device 160 may include a circulation pump 161, a recovery path 163 connecting the circulation pump 161 with the sedimentation water 131, 132, and 133, and the circulation pump 161 to the washing device 110. It is provided with a water supply path 150 for connecting.

The control unit 170 receives the cesium contamination concentration of each sedimentation tank (131, 132, 133) from the cesium measuring sensor 134, the recovery path 163 connected to the sedimentation tank located downstream of the sedimentation tank satisfying the reference value By controlling the valve 167 to be installed to control the circulation pump 161 to pump the water can be reused, it can be reused by circulating the water.

In addition, the control unit 170 does not discharge as it is when the degree of contamination of the water in the sedimentation tank 133 at the lowest level does not discharge as it is, but by circulating to the washing device 110 to go through the decontamination process, finally Control may be made to ensure safe water discharge.

A method of decontaminating contaminated soil using the cesium contaminated soil decontamination system according to an embodiment of the present invention having the above configuration will be described.

First, referring to FIGS. 1 to 3 and 7, contaminated soil is collected in a cesium contaminated area (S10). The collection method may be various, and the collection method or assumption of soil pollution does not limit the present invention.

Collected contaminated soil 10 may be collected in one place and then transferred to the decontamination site using the transfer means 20 for decontamination treatment, and may be transferred for decontamination treatment immediately after being collected.

The soil contamination 10 collected and transported is supplied to the washing apparatus 110 as shown in FIG. 1 to undergo a washing process (S20). In the washing step (S20) by supplying the soil contaminated by a predetermined amount to the sieve network 111, by spraying the water sieve 111, respectively, up and down to wash the contaminated soil so that the cesium adsorbed to the soil is washed and separated. At this time, it is possible to increase the washing efficiency by washing while stirring the contaminated soil.

And it collects the washed contaminated water (S30). That is, by installing the sieve 111 to cover the upper portion of the collecting tank 120, the contaminated water used for washing may be collected in the collecting tank 120 mounted on the sieve 111 (S30).

The collected polluted water is allowed to be adsorbed using the cesium adsorption means 140 while flowing through the collecting tank 120 and the settling tank (131, 132, 133) and flows step by step (S40). That is, in the collection tank 120 by driving the stirrer 112 to stir the contaminated water and sediment completely so that cesium is included in the contaminated water, and overflows to flow into the settling tank (131, 132, 133), the main adsorption The structure 141 and the sub adsorption structures 143 and 144 may be adsorbed to cesium.

In particular, in the main adsorption structure 141, which has a wide plate-shaped duct structure in which the contaminated water overflows and flows downstream, and is widely installed on the bottom wall of the conveying path 150, it is in contact with contaminated water. Since a large area can be secured, cesium can be effectively adsorbed and removed from the flowing contaminated water.

This adsorption process is performed by the contaminated water passing through the plurality of settling tanks (131, 132, 133) step by step, the contamination of the contaminated water is lowered downstream.

Therefore, the cesium measuring sensor 134 installed for each settling tank (131, 132, 133) measures the cesium contamination degree and transmits the measured information to the control unit 170 (S50).

In addition, the control unit 170 checks the pollution degree of the sedimentation tanks 131, 132, and 133 based on the information measured by the cesium measuring sensor 134, and determines whether the allowable value is satisfied.

As a result of the determination, when the cesium contamination concentration reaches the allowable value, the control unit 170 determines whether to discharge safe water or reuse (S60), and when reused, it can be recycled by being supplied to the washing device 110. If the discharge is determined, the water is discharged in a safe state (S70).

In addition, when the concentration of the contaminated water measured in the step (S50) is not suitable for discharge, the circulator 160 is also driven to control the contaminated water to the upstream collecting tank 120 to the sedimentation water (131, 132, 133). By re-supply by repeating the stirring and cesium adsorption process (S40), it is possible to discharge only the contaminated water in a safe state.

In addition, the soil remaining in the sieve 111 or the sedimentation tank 120 to the sedimentation tank (131, 132, 133) to collect the sediment collected separately to measure the cesium concentration and check whether the acceptable value (S80).

If it is confirmed that the soil is safe, the soil is discharged to be used (S90).

On the contrary, if the result of the check in step (S80), the soil pollution degree does not meet the allowable value, it is repeatedly discharged after the treatment process until the soil pollution meets the allowable value.

Meanwhile, the cesium adsorption means 140, ie, the main and sub adsorption structures 141, 143, and 144, which adsorbs a large amount of cesium during the process (S40), is separated, and then transferred to a separate combustion device through a combustion treatment process. The adsorbed cesium is decontaminated (S100).

That is, in the step (S100), if the tiles, blocks, and the like that have adsorbed cesium are subjected to a combustion treatment process, cesium adsorbed on the surface of the Prussian is burned by high temperature heat to complete the decontamination treatment. Of course, in the case where the structure adsorbed cesium is a fibrous body, after the drying process, the cesium adsorbed together with the fibrous body may be completely burned and decontaminated.

Then, the main and sub adsorption structures 141, 143, and 144 separated for the step S100 may be replaced with new ones, or in the case of a tile or block structure, may be recycled by resurfacing by resurfacing with Prussian ( S110).

As described above, according to the cesium contaminated soil decontamination method and system according to an embodiment of the present invention, it is possible to separate the cesium adsorbed to the soil by washing the contaminated soil with water. And the contaminated water contaminated by washing is adsorbed to the adsorbing structure through a plurality of steps of stirring and cesium adsorption process, and finally, it is possible to discharge safe water downstream.

And the cesium adsorption means adsorbed cesium can be safely decontaminated by treatment at a high temperature through a separate combustion process.

In addition, the washed soil can be used as soil for growing crops as living soil, not dead soil, because minerals and organic matter are preserved as it is. Therefore, the polluted soil contaminated by the explosion of nuclear power plant can be collected and decontaminated, and then restored and used again, thereby preventing the deterioration of soil resources and using it, thereby regenerating the natural environment safely.

In particular, according to the present invention, the installation is simple and does not require a large power, there is an advantage that can be installed and operated at a low cost, there is an advantage that can reuse the cesium adsorption means and decontaminated water.

In addition, depending on the amount of soil to be decontaminated, the facility can be configured in various ways, and in particular, a large-capacity treatment facility can be implemented to treat a large amount of contaminated soil in a short period of time.

In addition, according to the cesium contaminated soil decontamination system 100 ′ according to another embodiment of the present invention, as shown in FIG. 5, not only the collecting tank 120 but also each of the plurality of downstream sedimentation tanks 131, 132, 133 ( 110) can be installed to clean contaminated soil, or it is possible to repeatedly wash the already washed soil.

In addition, according to the cesium contaminated soil decontamination system (100 ") according to another embodiment of the present invention, as shown in Figure 6, the collecting device 120 and the washing device 110 in the upstream side settling tank 131 By installing the washing process to contaminate soil only upstream, downstream sedimentation tank (132, 133) can be made so that only the adsorption process.

In addition, an agitator 112 may be installed in the collection tank 120 and the upstream settling tank 131 to stir the precipitate at low speed, and the agitator may be omitted in the downstream settling tanks 132 and 133.

While specific embodiments of the invention have been described and illustrated above, it is to be understood that the invention is not limited to the described embodiments, and that various modifications and changes can be made without departing from the spirit and scope of the invention. It is self-evident to those who have. Therefore, such modifications or variations are not to be understood individually from the technical spirit or point of view of the present invention, modified embodiments will belong to the claims of the present invention.

100,100 ', 100 ".. Cesium Contaminated Soil Decontamination System
110. Washing device 120. Collection tank
131,132,133 .. Sedimentation tank 140 .. Cesium adsorption means
141..Main adsorption structure 143,144..Sub adsorption structure
150 .. water transfer path 160 .. circulator
170. Control Unit

Claims (18)

A soil washing step of washing the contaminated soil with water to decontaminate cesium from the soil;
A polluted water collecting step of collecting the polluted water used in the soil washing step; And
Cesium contaminated soil decontamination method comprising a; adsorbing step of adsorbing the cesium contained in the contaminated water by passing the collected contaminated water surface treated with Prussian blue. The method of claim 1,
Cesium polluted soil decontamination method further comprises a water circulation step of circulating supply so that the water passed through the adsorption step can be reused in the washing step. The method of claim 1,
Further comprising a; Contaminated water measuring step of measuring the degree of contamination of the water passed through the adsorption step,
Cesium polluted soil decontamination method characterized in that the adsorption step is divided into a plurality of steps until the concentration of cesium in the contaminated water measurement step is less than the reference value. The method of claim 1, wherein the washing step,
Injecting contaminated soil over a strainer installed at the inlet of the contaminated water collection tank;
A water spray step of spraying and washing water into the contaminated soil introduced onto the strainer; And
Cesium polluted soil decontamination method comprising the; stirring step of stirring the soil and the precipitated soil on the sieve. The method of claim 1, wherein in the adsorption step,
The condensed water collected in the collecting step overflows and flows to the settling tank, and the adsorption structure is disposed on the transport path of the contaminated water flowing into the settling tank to adsorb and decontaminate cesium from the contaminated water. Cesium-contaminated soil decontamination method. The method according to any one of claims 1 to 4,
Cesium soil contamination decontamination method characterized in that the cesium adsorption member containing Prussia is further installed on the inner wall of the contaminated water collection tank. The method according to any one of claims 1 to 5,
The adsorption structure is installed on the conveying path of the contaminated water, cesium soil pollution method comprising a tile or fiber painted Prussian on the outer surface. A washing device for washing soil contaminated with cesium;
A collecting tank accommodating soil and contaminated water washed by the washing apparatus;
A plurality of sedimentation tanks for storing and overflowing the contaminated water and the soil contained in the contaminated water overflowed in the collection tank step by step;
And cesium adsorption means for adsorbing cesium contained in the contaminated water flowing through the plurality of sedimentation tanks using Prussian in the collection tank. The method of claim 8,
Cesium contaminated soil decontamination system, characterized in that it further comprises a precipitated soil stirrer for stirring the soil precipitated inside the collection tank. According to claim 8, The washing device,
A strainer installed at the inlet of the collection tank;
A first water spray unit for spraying water onto the contaminated soil supplied to the strainer;
A second water spray unit installed to spray water from the bottom of the strainer to the contaminated soil;
A connection member connecting the first and second water injection parts; And
Cesium polluted soil decontamination system comprising a; water supply pump for supplying water to the connection member. The method of claim 10, wherein the washing device,
Further comprising a drive motor for rotating the connection member,
The cesium contaminated soil decontamination system of claim 1, wherein the first and second water spraying parts spray water to the upper and lower portions of the contaminated soil placed on the screen while rotating about the connecting member. The method of claim 11,
Cesium polluted soil decontamination system further comprises a stirrer for stirring the soil precipitated inside the collection tank while being connected to the connection member. The cesium adsorption means according to any one of claims 8 to 12,
Removably installed in the contaminated water transfer path is installed on the moving path of the contaminated water flowing through the plurality of sedimentation tank from the collection tank, and includes a main adsorption structure treated to expose the Prussian on the outer surface Cesium polluted soil decontamination system. The method of claim 13,
The main adsorbent structure is cesium contaminated soil decontamination system, characterized in that it comprises at least any one selected from the blocks, tiles and fibers painted Prussian on the surface. The method of claim 13, wherein the cesium adsorption means,
Cesium contaminated soil decontamination system further comprises a sub-adsorption structure that is detachably installed on at least one inner wall of the collection tank and the settling tank, the surface treated with Prussian. The method of claim 13,
The contaminated water transfer path is disposed to be inclined to connect between an upstream settling tank and a downstream settling tank and between the collection tank and a downstream settling tank,
It has a plate-shaped bottom wall, and vertical walls connected to both sides of the bottom wall,
The cesium adsorption soil decontamination system, characterized in that the cesium adsorption means is installed on the bottom wall to adsorb cesium from the contaminated water flowing through the bottom of the bottom wall. The method according to any one of claims 8 to 12,
Cesium contaminated soil decontamination system is installed in each of the plurality of sedimentation tank further comprises a cesium concentration measuring sensor for measuring the contamination state of the contaminated water. The method of claim 17,
Cesium contaminated soil decontamination system, characterized in that it further comprises a use water circulation device for circulating to the washing device to be reused when the contamination state of the contaminated water among the plurality of sedimentation tank meets the acceptance criteria.

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