JP2016065729A - Dehydration/solidification device for sludge containing radioactive substance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dehydration/solidification device capable of efficiently and safely treating sludge containing a radioactive substance without using filter pressing.SOLUTION: The sludge containing the radioactive substance is added with cement, and then dehydrated and solidified by a vacuum pressure dehydrator 200 such that a dehydration cake 50 is generated. A method of conveying the dehydration cake 50 is varied according to a concentration of the radioactive substance in the dehydration cake 50. A group of devices to be used in a case when the concentration of the radioactive substance contained in the dehydration cake 50 is less than a reference value includes a dehydration cake separating/dropping device 60, a fragmentation device 70, and a conveyance device 80. A group of devices to be used when the concentration of the radioactive substance contained in the dehydration cake 50 is the reference value or higher includes a dehydration cake sucking/separating device 110, a stacking device 120, and a storage device 130.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a dehydrating and solidifying apparatus for dehydrating and solidifying sludge containing radioactive substances to reduce the volume, and in particular, using a vacuum pressure dehydrating apparatus to dehydrate and solidify sludge to which cement has been added. It is related with the dehydration solidification apparatus of the sludge containing the radioactive substance which made the carrying-out method differ according to the content concentration of.

  Waste that contains radioactive materials must be treated as specified waste by the law if it exceeds the specified standard value. Moreover, even if it is a waste less than a predetermined reference value, it is necessary to process safely. Various techniques have been proposed for treating waste containing radioactive materials (see, for example, Patent Document 1).

  The technique described in Patent Document 1 relates to a method for decontaminating radioactive waste and treating a waste liquid, and a method of solidifying the radioactive waste with cement or dehydrating a solution containing the radioactive waste with a filter press. Is disclosed.

  Currently, a large amount of soil and the like removed by decontamination is generated, and development of a method for safely treating this is desired. In particular, the polluted muddy water generated in the decontamination work and the bottom soil such as a pond have a high water content. Therefore, it is necessary to reduce the volume by dehydration, and it is necessary to treat it efficiently and safely.

JP 2005-274543 A

  As mentioned above, sludge containing radioactive substances that need to be reduced in volume by dehydration must be treated efficiently and safely, but dehydration and volume reduction using a filter press should be improved. There were various problems.

  That is, the slurry generated in the decontamination work often contains a lot of organic substances, and the dehydration time tends to be prolonged, and the cycle time becomes several hours. End up. When the volume of the filter chamber is increased, the amount of soil particles handled at a time is increased, so that the air dose rate around the facility is increased, and there is a problem that the risk of exposure to workers is increased.

  In addition, when the inorganic slurry is treated, the dewatering time is prolonged, and when the treatment capacity is insufficient, the dehydrated cake having a high water content ratio has to be discharged. Furthermore, it is often a dehydration treatment up to the vicinity of the liquid limit, and it tends to re-mud, and the polymer agglomerate tends to decompose with the passage of time after the dehydration treatment, resulting in a decrease in strength. For this reason, it re-mudged during the compacting work, and it was easy to cause construction trouble.

  In addition, since dehydrated cake may come into contact with rain, groundwater, or re-mud over time, if a long period of time elapses before installing a water-blocking layer on top of it, dehydration may occur. There is an inherent risk of spilling soil particles due to re-mudging from the cake.

  In addition, since there is no filter press for fully automatic operation, work around the dehydrated cake with a high concentration of radioactive material occurred, and it was necessary to take measures to protect workers from exposure.

  The present invention has been proposed in view of the above-described circumstances, and an object thereof is to provide a dehydrating and solidifying apparatus capable of efficiently and safely treating sludge containing radioactive substances without using a filter press. And

  The sludge dewatering and solidifying apparatus containing the radioactive substance of the present invention has the following features in order to achieve the above-described object. That is, the sludge dewatering and solidifying apparatus containing the radioactive substance of the present invention is an apparatus for reducing the volume by adding cement to the sludge containing the radioactive substance and dehydrating and solidifying the sludge. In parallel, the filter plates are in close contact with each other, and a vacuum pressure dehydration device that generates dehydrated cake by pressurizing sludge and vacuum drainage, and two types of devices for carrying out the dehydrated cake are provided. Yes.

  The first device group for carrying out the dehydrated cake includes a dehydrated cake removing and dropping device for separating and dropping the dehydrated cake from the filter plate after separating the filter plate taken out from the vacuum pressure dewatering device, and a vacuum pressure dehydrating device. And a subdividing device for subdividing the dehydrated cake that has fallen off the filter plate and a conveying device for conveying the dehydrated cake subdivided by the subdividing device.

  In addition, the second group of devices for carrying out the dehydrated cake is a dehydrated cake suction / detachment device that sucks and desorbs the dehydrated cake from the filter plate after separating the filter plate taken out from the vacuum pressure dehydrator, and a suction from the filter plate. A stacking device for stacking the detached dehydrated cake in a substantially vertical direction and a storage device for storing the stacked dehydrated cake in a storage container are provided.

  And when the radioactive substance concentration of the dehydrated cake is less than the predetermined reference value, the dehydrated cake is carried out using the first device group, and when the radioactive substance concentration of the dehydrated cake is equal to or higher than the predetermined reference value, Use the second device group to store the dehydrated cake in a storage container and carry it out.

  In the above-described sludge dewatering and solidifying apparatus containing radioactive material, the dewatering cake removing and dropping device is configured as a device that moves the filter plate up and down to remove the dewatering cake from the filter plate, and the subdividing device is detached. When the dewatered cake that has fallen collides, it is possible to configure the dehydrated cake from a mesh.

  Moreover, in the dewatering and solidifying apparatus for sludge containing the radioactive substance described above, the dewatered cake suction / release device has a suction part that is in close contact with the surface of the dehydrated cake, and sucks the dehydrated cake by performing suction at the suction part. The stacking device is moved to a substantially horizontal state by moving the dehydrated cake while continuing the suction by the suction part, and then the suction by the suction part is finished and the dehydrated cake is finished. The storage device can be configured as a device that covers and seals the stacked dewatered cake.

  Further, in the above-described sludge dehydrating and solidifying apparatus containing a radioactive substance, the radioactive substance contained in the sludge to be dehydrated and solidified is radioactive cesium, and the selection standard value for the method of carrying out the dehydrated cake is a radioactive cesium concentration of 10 It can be 10,000 becquerels / Kg.

  According to the dewatering and solidifying apparatus for sludge containing radioactive substances according to the present invention, various problems in the case of using a filter press can be solved by using a vacuum pressure dehydrating apparatus without using a filter press. .

  That is, the addition of cement promotes the aggregation of the soil particles in the slurry and increases the dehydrating property, shortens the treatment cycle, and makes it possible to reduce the volume of the filter chamber. For this reason, the air dose rate around the equipment can be kept low, and the exposure risk of workers can be suppressed. Further, since the equipment can be reduced in size, mechanical loss and the like are reduced, and the operation cost can be reduced.

  Moreover, even if the slurry contains a large amount of organic matter, the dehydrating property can be improved by adding cement. At this time, the amount of sludge that can be treated per unit time can be adjusted by adjusting the amount of cement added. Moreover, since cement is added, handling property is high, and it becomes possible to reduce the risk of trouble occurrence when unmanned construction is performed.

  The dewatered cake treated by the dewatering and solidifying device of the present invention does not re-mud due to the influence of rainfall, groundwater, etc., so it can be stored even in rainy conditions, and there is a possibility that radioactive substances may diffuse into the environment together with soil particles. Absent. Further, since this dehydrated cake has a low moisture content and a high density, it can be processed using a cake frying machine. As described above, since the automated operation is possible, the work around the dehydrated cake is eliminated, so that the exposure risk of the worker can be suppressed.

Explanatory drawing of the vacuum pressurization dehydration apparatus which is a component of the dehydration solidification apparatus of the sludge containing the radioactive substance which concerns on embodiment of this invention. Explanatory drawing which shows the process sequence in case the radioactive substance density | concentration of a dewatering cake is less than a predetermined reference value. Explanatory drawing which shows the process sequence in case the radioactive substance density | concentration of a dewatering cake is more than a predetermined reference value. Explanatory drawing which shows the process sequence in case the radioactive substance density | concentration of a dewatering cake is more than a predetermined reference value. Explanatory drawing which shows the path | route of concentrated sludge. Explanatory drawing which shows the path | route of washing water.

  Hereinafter, an embodiment of a sludge dewatering and solidifying apparatus containing a radioactive substance according to the present invention (hereinafter abbreviated as a dehydrating and solidifying apparatus) will be described with reference to the drawings. 1 to 6 illustrate a dewatering and solidifying apparatus for sludge containing radioactive substances according to an embodiment of the present invention. FIG. 1 is an explanatory view of a vacuum pressure dehydrating apparatus. FIG. FIG. 1B is a side view of the filter plate, and FIG. 1C is a schematic view of the state in which a plurality of filter plates are brought into close contact to form a filter chamber as viewed from the side. FIGS. 2 to 4 are explanatory diagrams showing the treatment procedure for sludge dehydration and solidification, and FIGS. 2 (a) to 2 (c) show the case where the radioactive substance concentration of the dewatered cake is less than a predetermined reference value. FIGS. 3 (a) to 3 (f) and FIGS. 4 (a) to 4 (g) are explanatory diagrams showing the processing procedure, and the processing procedure when the radioactive substance concentration of the dehydrated cake is equal to or higher than a predetermined reference value. It is explanatory drawing shown. FIG. 5 (a) is an explanatory view showing the path of concentrated sludge, FIG. 5 (b) is an explanatory view showing a state where the slurry is filtered by a filter plate (filter cloth), and FIG. 6 (a) is a path of washing water. FIG. 6B is an explanatory view showing a state in which the slurry is washed with washing water.

  The dehydrating and solidifying apparatus according to the embodiment of the present invention is an apparatus for reducing the volume by adding cement to sludge containing a radioactive substance such as radioactive cesium and dehydrating and solidifying. In the present invention, the object of dehydration and solidification is, for example, slurry generated after turbid water treatment of treated water containing radioactive material generated by decontamination work or sludge settled in a reservoir. That is, the dehydrating and solidifying apparatus of the present embodiment adds cement to slurries and sludge pumped from turbid water treatment slurry, and then dehydrates and solidifies with a vacuum pressure dehydrating apparatus to produce a dehydrated cake. Depending on the concentration, the method of carrying out the dehydrated cake is varied.

  A dehydrating and solidifying apparatus according to an embodiment of the present invention includes a vacuum pressure dehydrating apparatus as a main component, and includes two types of apparatus groups for carrying out the dehydrated cake after dehydrating and solidifying. The two types of device groups are a device group that drops and dehydrates the dehydrated cake from the filter plate, and a device group that vacuum-sucks the dehydrated cake from the filter plate, stacks it, and stores it in a storage container. Hereinafter, these devices will be described in detail.

<Vacuum pressure dehydration device>
As shown in FIG. 1A, the filter plate 10 constituting the vacuum pressurizing and dehydrating apparatus 200 is made of a frame-shaped member, and in the frame, a sludge inlet 11, a vacuum suction port 12, and a drainage outlet 13 are formed. It has. Moreover, the filter cloth 14 is arrange | positioned so that the opening part connected to the sludge inlet 11 may be covered. As shown in FIGS. 1B and 1C, the upper part of each filter plate 10 is supported by a support member 15, and the support member 15 is suspended by a rod-shaped suspension member 20. The plurality of filter plates 10 can be converted into a closed frame state and an open frame state by moving each filter plate 10 suspended on the suspension member 20.

  As shown in FIG. 1 (c), adjacent support members 15 are brought into close contact with each other to form a filter plate assembly, a blocking plate 30 is disposed on one side surface of the filter plate assembly, and a sludge inlet 11 is disposed on the other side surface. A flow passage plate 40 having openings communicating with the vacuum suction port 12 and the filtrate discharge port 13 is disposed to form a filter chamber assembly. In a state (closed frame state) in which each filter plate 10 is in close contact with the blocking plate 30 and the flow path plate 40, a filter chamber assembly is formed which is a sealed space in which a plurality of filter plates 10 are arranged in parallel. On the other hand, in a state where each filter plate 10 is separated from the blocking plate 30 and the flow path plate 40 (open frame state), the dehydrated cake 50 attached to each filter plate 10 can be taken out.

  In order to form the dewatered cake 50 by dewatering and solidifying the sludge, as shown in FIG. 5A, in the vacuum pressure dewatering apparatus 200 in the closed frame state, the sludge to which cement is added is fed from the sludge inlet 11. Then, the vacuum pump connected to the vacuum suction port 12 is operated to suck and depressurize each filter chamber, and the slurry is dehydrated by the filter cloth 14 attached to the filter plate 10, and the filtrate is drained from the filtrate discharge port 13. Discharge. At this time, as shown in FIG. 5B, the slurry is filtered by the filter plate 10 (filter cloth 14) to form a dehydrated cake.

  When the dehydrated cake is formed, the vacuum pressure dehydrating apparatus 200 is opened, and the dehydrated cake stuck to the surface of each filter plate 10 is taken out. In the present invention, two types of carry-out device groups are provided as devices for taking out and carrying out the dehydrated cake. Each carry-out device group is selectively used depending on whether the radioactive substance concentration contained in the dehydrated cake is less than the reference value or more than the reference value group.

  Moreover, after taking out the dewatering cake, each filter chamber is washed. In order to wash each filtration chamber, as shown in FIG. 6B, in the vacuum pressure dehydration apparatus 200 in a closed frame state, washing water is caused to flow into each filtration chamber from the filtrate discharge port 13 to perform dehydration. Wash water is circulated in the reverse path to the time when the cake is generated, and the wash water after washing is discharged from the sludge inlet 11 to the outside of each filter chamber. The washing water containing the discharged slurry is used again for sludge dehydration and solidification. At this time, as shown in FIG. 6B, the slurry adhering to the filter plate 10 (filter cloth 14) is washed away with washing water.

<First unloading device group>
As shown in FIGS. 1A to 1C, the first carry-out device group is a device group used when the concentration of radioactive material contained in the dehydrated cake 50 is less than a reference value, and the dehydrated cake is detached. A dropping device 60, a subdividing device 70, and a conveying device 80 are provided. For example, when the radioactive substance is radioactive cesium, the first carry-out device group is used when the radioactive cesium concentration is less than 100,000 becquerel / Kg.

<Dehydrated cake removal dropping device>
The dewatering cake removing and dropping device 60 is for separating and dropping the dewatering cake 50 from the filter cloth 14 attached to the filter plate 10 after separating the filter plate 10 taken out from the vacuum pressure dehydrating device 200 (after opening the frame). For example, a lift device is used. Specifically, as shown in FIG. 2 (b), the filter plate 10 (filter cloth 14) is moved up and down by pulling the filter plate 10 suspended on the suspension member 20 upward and adheres to the filter cloth 14. The dehydrated cake 50 is dropped downward by gravity.

  The subdividing apparatus 70 is an apparatus for subdividing the dewatered cake 50 that is located below the filter plate 10 taken out from the vacuum pressure dehydrating apparatus 200 and dropped from the filter cloth 14 and is made of, for example, a mesh. To do. That is, the dewatered cake 50 that has been peeled off from the filter plate 10 and dropped due to gravity is divided into small pieces by colliding with and contacting the mesh.

  The conveying device 80 is a device for conveying the dehydrated cake 50 subdivided by the subdividing device 70. Specifically, as shown in FIG. 2C, a belt installed below the subdividing device 70. Consists of a conveyor. In the present embodiment, the first belt conveyor 81 that transports the dewatered cake 50 subdivided below the subdividing device 70 in the lateral direction and the lower end portion of the first belt conveyor 81 toward the storage bag 90. And a second belt conveyor 82 that conveys the dewatered cake 50. The dehydrated cake 50 conveyed by the second belt conveyor 82 falls into the storage bag 90 and is stored in the storage bag 90. As the storage bag 90, a commercially available bag for storing earth and sand can be used.

  Moreover, it is preferable to install the collection basket 100 which inclines downward toward the start end part from the terminal part of the conveyance direction of the dewatering cake 50 below the conveying apparatus 80. The dewatering cake 50 spilled from the conveying device 80 can be collected by the collection basket 100. Further, by providing the washing water nozzle 101 for injecting the washing water into the collection basket 100, the dehydrated cake 50 that has fallen on the collection basket 100 can be washed away. The washing water containing the dewatering cake 50 may be allowed to flow into the vacuum pressure dewatering apparatus 200 using the muddy water pump 102 or the like.

<Method for carrying out dehydrated cake by first carrying-out device group>
In order to carry out the dewatered cake 50 by the first carry-out device group, as shown in FIG. 2A, the vacuum pressure dehydration device 200 is opened and a space is formed between the filter plates 10. Subsequently, as shown in FIG. 2 (b), the dehydrated cake detaching and dropping device 60 is driven, and the filter plate 10 is pulled upward to detach and dehydrate the dehydrated cake 50 from the filter cloth 14. The dewatered cake 50 that has fallen and dropped is subdivided by the subdividing device 70 as shown in FIG. The subdivided dehydrated cake 50 is conveyed by the first belt conveyor 81 and the second belt conveyor 82 and stored in the storage bag 90.

<Second unloading device group>
The second carry-out device group is a device group used when the concentration of radioactive material contained in the dehydrated cake 50 is equal to or higher than a reference value, and FIGS. 3 (a) to 3 (f) and FIGS. As shown in g), a dehydrated cake suction / detachment device 110, a loading device 120, and a storage device 130 are provided. For example, when the radioactive substance is radioactive cesium, the second unloading device group is used when 100,000 becquerels / Kg or more.

<Dehydrated cake suction and removal device>
The dehydrated cake suction / removal device 110 is a device for removing the dehydrated cake 50 from the filter cloth 14 attached to the filter plate 10 after separating the filter plate 10 taken out from the vacuum pressure dehydration device 200. Specifically, the dehydrated cake suction and detachment device 110 has a suction unit 111 that is in close contact with the surface of the dehydrated cake 50, and the dehydrated cake 50 is brought into close contact with the suction unit 111 by performing suction with the suction unit 111. Remove from the filter cloth 14.

<Raising device>
The stacking device 120 is a device for stacking the dehydrated cake 50 sucked and separated from the filter cloth 14 in a substantially vertical direction. That is, the stacking device 120 moves the dehydrated cake 50 while maintaining the suction by the suction unit 111 to make the dehydrated cake 50 substantially horizontal, and then finishes the suction by the suction unit 111 and stacks the dehydrated cake 50. More specifically, the suction part 111 in the substantially vertical direction is moved above the filter plate 10 to rotate the suction surface to make it substantially horizontal, and the suction part 111 is moved to the side of the filter plate 10. Then, by stopping suction by the suction unit 111, the dehydrated cake 50 is separated from the suction unit 111 and the dehydrated cake 50 is stacked on the pallet 140.

<Storage device>
The storage device 130 is a device for storing the dehydrated cake 50 stacked by the loading device 120 in a storage container. Specifically, the storage device 130 covers the storage container (for example, the drum can 150) from above the dehydrated cake 50 stacked on the pallet 140, and the bottom of the drum can 150 is closed with the pallet 140. 140 is turned upside down. Thereafter, the pallet 140 is removed, the lid 151 is attached, and the dehydrated cake 50 is sealed in the drum can 150.

<Method for carrying out dehydrated cake by second carry-out device group>
In order to carry out the dehydrated cake 50 by the second carry-out device group, as shown in FIG. 3 (a), the dehydrated cake suction / detachment device 110 is driven by opening the filter plates 10 one by one and driving the dehydrated cake suction / release device 110. The suction part 111 is brought into close contact with the surface of 50. Subsequently, as shown in FIG. 3 (b), the dewatering cake 50 is moved in the horizontal direction while continuing the suction by the suction unit 111 by the stacking device 120, and the dewatered cake 50 is moved to the filter plate 10 (filter cloth 14). Remove from. Subsequently, as shown in FIG. 3 (c), the dewatering cake 50 is pulled up above the filter plate 10 while continuing the suction by the suction part 111, and the suction part 111 is moved 90 degrees as shown in FIG. 3 (d). The filter plate 10 is rotated to be in a substantially horizontal state and is moved to the side of the filter plate 10.

  Subsequently, as shown in FIG. 3E, the dehydrated cake 50 is moved onto the pallet 140 while continuing the suction by the suction unit 111, and the suction by the suction unit 111 is stopped, whereby the dehydrated cake is placed on the pallet 140. Stack 50. Subsequently, as shown in FIG. 3 (f), the next pallet 140 is moved to the removal position of the dehydrated cake 50, and the operations shown in FIGS. 3 (a) to 3 (e) are performed. As described above, by repeatedly performing the operations of FIGS. 3A to 3F, the dewatered cakes 50 can be removed from all the filter plates 10 and stacked.

  As illustrated in FIG. 4A, when stacking of the dehydrated cake 50 is completed, the dehydrated cake 50 is stored in the drum can 150 by the storage device 130. The storage device 130 may have any configuration. For example, a device capable of moving the drum can 150 or the pallet 140 up and down and left and right may be used. In order to store the dewatered cake 50 in the drum can 150, as shown in FIG. 4B, the drum can 150 is positioned on the upper portion of the stacked dehydrated cake 50, and the drum can 150 is moved downward to form the dehydrated cake 50. Cover. At this time, the bottom surface of the drum can 150 is open.

  When the drum can 150 is put on the dehydrated cake 50, as shown in FIGS. 4C and 4D, the pallet 140 and the drum can 150 are integrally turned upside down. Subsequently, as shown in FIG. 4 (e), the drum can 150 is lowered from the pallet 140, the pallet 140 is moved in preparation for the next loading operation, and the opening of the drum can 150 is opened as shown in FIG. 4 (f). A drum 151 containing the dewatered cake 50 is hermetically sealed by covering the part with a lid 151. Then, as shown in FIG. 4 (g), the drum can 150, which contains the dehydrated cake 50 and is sealed, is placed on the transfer vehicle 160 and transferred from the work place where dehydration and solidification is performed to the processing facility.

<Transfer of dehydrated cake>
As described above, in the present invention, the dehydration cake 50 having a radioactive substance concentration of less than a predetermined value and the dehydration cake 50 having a predetermined value or more are distinguished and carried out, so the risk of exposure to workers is eliminated and the radioactive substance is removed. The contained sludge can be treated promptly and appropriately.

DESCRIPTION OF SYMBOLS 10 Filter plate 11 Sludge inlet 12 Vacuum suction port 13 Drain outlet 14 Filter cloth 15 Support member 20 Suspension member 30 Blocking plate 40 Flow path plate 50 Dehydrated cake 60 Dehydrated cake detachment dropping device 70 Subdividing device 80 Transport device 81 1st 1 belt conveyor 82 second belt conveyor 90 storage bag 100 recovery bowl 101 washing water nozzle 102 muddy water pump 110 dehydrated cake suction / removal device 111 suction unit 120 lifting device 130 storage device 140 pallet 150 drum can 151 lid 160 transport vehicle 200 vacuum Pressure dehydrator

Claims (4)

A device for volume reduction by adding cement to sludge containing radioactive material and dehydrating and solidifying,
A vacuum pressure dehydration device that produces a dehydrated cake by bringing a plurality of filter plates into close contact in a sealed space in parallel, pressurizing sludge and performing vacuum drainage, and
After separating the filter plate taken out from the vacuum pressure dehydrator, the dehydrated cake removing and dropping device for separating and dropping the dehydrated cake from the filter plate;
Located under the filter plate taken out from the vacuum pressure dehydrator, a fragmentation device for subdividing the dehydrated cake that has fallen off the filter plate,
A transport device for transporting the dewatered cake subdivided by the subdividing device;
After separating the filter plate taken out from the vacuum pressure dehydrator, a dehydrated cake suction and desorption device that sucks and desorbs the dehydrated cake from the filter plate;
A stacking device for stacking the dehydrated cake sucked and removed from the filter plate in a substantially vertical direction;
A storage device for storing the stacked dehydrated cake in a storage container; and
When the radioactive substance concentration of the dehydrated cake is less than a predetermined reference value, the dehydrated cake is unloaded using the dehydrated cake removing and dropping device, the subdividing device, and the conveying device,
When the radioactive substance concentration of the dehydrated cake is equal to or higher than a predetermined reference value, the dehydrated cake is stored in a storage container and carried out using the dehydrated cake suction and release device, the loading device, and the storage device.
An apparatus for dewatering and solidifying sludge containing a radioactive substance. The dewatering cake detaching and dropping device is a device that moves the filter plate up and down to detach and drop the dehydrated cake from the filter plate,
The subdividing device is made of a mesh that subdivides the dehydrated cake by the impact of the dehydrated cake that has fallen and dropped.
The apparatus for dewatering and solidifying sludge containing the radioactive substance according to claim 1. The dehydrated cake suction / detachment device has a suction part that is in close contact with the surface of the dehydrated cake, and performs suction at the suction part, whereby the dehydrated cake is brought into close contact with the suction part and detached from the filter plate. And
The stacking device is a device that moves the dehydrated cake while continuing suction by the suction unit to be in a substantially horizontal state, and then finishes suction by the suction unit and stacks the dehydrated cake.
The storage device is a device that covers and seals the stacked dewatered cake,
An apparatus for dewatering and solidifying sludge containing a radioactive substance according to claim 1 or 2. The radioactive substance is radioactive cesium,
4. The dehydrating and solidifying sludge containing radioactive material according to claim 1, wherein the selection standard value of the method for carrying out the dehydrated cake is a radioactive cesium concentration of 100,000 becquerel / Kg. apparatus.

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