JP6467764B2 - Radioactive material adsorption filter, radioactive material adsorption device, and radioactive material adsorption system - Google Patents

Description

  The present invention relates to a radioactive substance adsorption filter, a radioactive substance adsorption device, and a radioactive substance adsorption system for adsorbing and removing radioactive substances in contaminated water containing radioactive substances using a radioactive substance adsorbing material.

  When a pipe or pressure vessel is damaged like the accident at Fukushima Daiichi Nuclear Power Station that occurred on March 11, 2011, it contained radioactive substances such as iodine 131, cesium 134, cesium 137, and strontium 98. Reactor cooling water may leak in large quantities. Among these radioactive materials, cesium 137 has a long half-life of 30 years, and if it leaks out of a nuclear power plant, it will adversely affect the environment for a long period of time.

As a radioactive material adsorbent for adsorbing and removing the cesium 137 from the drained waste water, a radioactive material recovery sheet supporting zeolite is known (see, for example, Patent Document 1).
Further, a water purification filter cartridge for removing cesium using zeolite is known (see Patent Document 2). This is intended to remove cesium by providing a filtration layer formed by winding a nonwoven fabric with zeolite particles fixed on the surface.
However, when zeolite is used, there is a problem that the same amount of radioactive waste as the zeolite used remains.

Thus, a cesium adsorbent made of a hydrophilic fiber substrate carrying a Prussian blue analog is known as a radioactive substance adsorbent (see, for example, Patent Document 3). This is a Prussian blue analogue fixed inside the fiber. Since Prussian blue is generally a powder substance that is insoluble in water, such a cesium adsorbent can adsorb and purify cesium from contaminated water.
However, when removing radioactive substances from contaminated water at a nuclear power plant, it is necessary to quickly purify a large amount of contaminated water. Even if the cesium adsorbent disclosed in Patent Document 3 is used, such an adsorbent is used. There is a problem that a rapid purification process cannot be realized only by using the filter as a filter medium.

Also, a radioactive material adsorption and recovery device in which a ferrocyanide compound is supported on a cylindrical woven fabric formed by knitting with a thread material as a means to purify contaminated water by adsorbing rather than filtering the radioactive material Is known (see Patent Document 4).
However, the apparatus disclosed in Patent Document 4 is used by being installed in a river or seawater, and does not quickly purify contaminated water flowing out in large quantities.

Moreover, the installation structure of the storage container containing the radioactive cesium adsorbent used for the flow path etc. in the middle of flowing into a dam or a pond from a mountainous area is known (refer patent document 5).
However, in such a storage container containing a radioactive cesium adsorbent, there is a problem that the radioactive substance is not sufficiently removed.

JP2015-99140A JP 2013-88411 A Table 2013/27652 gazette JP 2014-122809 A JP 2014-98640 A

  When removing radioactive substances such as cesium from contaminated wastewater containing radioactive substances using radioactive substance adsorbents, the total amount of radioactive substance adsorbents necessary for purification depends on the adsorption amount per unit area and the adsorption rate. As a standard necessary for the purification of contaminated wastewater at a nuclear power plant, the NRA requires that a large amount of contaminated water, for example, a total of 1200 tons of contaminated wastewater be treated in one hour.

  In view of such a situation, an object of the present invention is to provide a radioactive substance adsorption filter, a radioactive substance adsorption device, and a radioactive substance adsorption system that can purify contaminated water containing a radioactive substance in a large amount in a short time.

In order to solve the above-mentioned problems, the radioactive substance adsorption filter of the present invention comprises a plurality of band-shaped radioactive substance adsorption fiber base materials carrying a radioactive substance adsorbent, which are laminated at an appropriate interval, and at least both ends in the major axis direction are open. This is a structure that is accommodated in the rectangular cylindrical frame that is aligned in the long axis direction. Using the gap between the radioactive substance-adsorbing fiber bases as a flow path, the contaminated water containing the radioactive substance is flowed in the long axis direction, and the radioactive substances are purified by adsorbing the radioactive substance on the radioactive substance-adsorbing fiber base.

The radioactive substance adsorption filter of the present invention does not remove the radioactive substance by filtering the contaminated water, but when the contaminated water passes through the gap in the radioactive substance adsorption filter as a flow path, By flowing near, radioactive material is adsorbed and removed from contaminated water. Since the method of filtration is not used, the processing time can be shortened and a large amount of contaminated water can be quickly purified.
The rectangular cylindrical frame includes not only those whose both ends in the long axis direction are open and whose side surfaces are closed, but also those whose both ends in the long axis direction are open and whose side surfaces are also open. . The rectangular cylindrical frame may be bent in addition to the one extending linearly in the long axis direction. Although a rectangular cylindrical frame is preferable from the viewpoint of mounting the filter, the cylindrical frame can be adjusted by adjusting the mounting method of the filter even if the cross section of the cylindrical frame is other shapes such as a parallelogram, trapezoid, and rhombus. It can be used as a frame.

Moreover, the radioactive substance adsorption fiber base material is laminated | stacked by the space | interval with an appropriate space | interval, by adhering the spacer extended in a longitudinal direction to both sides of a strip | belt shape.
Here, the rectangular cylindrical frame and the spacer may be formed of a combustible substance such as a resin material (polymer material). By being formed of a flammable substance, it becomes possible to incinerate the used filter without any special treatment, and the amount of radioactive waste can be reduced.
As the radioactive substance adsorbent, a Prussian blue analogue that mainly adsorbs and removes cesium is preferably used. Here, the Prussian blue analog is specifically Prussian blue.
The radioactive substance adsorbing fiber base material is a nonwoven fabric, a woven fabric, or a thread.

  In the radioactive substance adsorption filter of the present invention, the interval between the radioactive substance adsorption fiber base materials is preferably in the range of 0.5 to 2.5 mm. By being provided in such a range, the radioactive substance can be removed quickly and sufficient radioactive substance removing performance can be exhibited. Moreover, the occurrence of clogging of the filter can be prevented.

  In the radioactive substance adsorption filter of the present invention, it is preferable that an elastic body is attached to the outer peripheral portion of the rectangular cylindrical frame, and adjacent radioactive substance adsorption filters are fixed via the elastic body. This is because an impact caused by vibration can be buffered by the elastic body. Here, the elastic body is, for example, a leaf spring, an elastically deformable resin spring, a tension spring, or a compression spring.

Next, the radioactive substance adsorption device of the present invention will be described.
The radioactive substance adsorption device of the present invention has a configuration in which a plurality of the radioactive substance adsorption filters described above are bundled with the long axis direction aligned. A plurality of radioactive substance adsorption filters are bundled in parallel or in series, or in parallel and in series.
From another viewpoint, the radioactive substance adsorption device of the present invention includes the above-described radioactive substance adsorption filter and a housing unit provided with a through-hole through which the radioactive substance adsorption filter can be inserted and stored in the long axis direction. . The material of the housing unit is preferably a stainless steel plate, but may be formed of other metals or resins.

The radioactive substance adsorption device of the present invention is a housing unit provided with a radioactive substance adsorption filter in which an elastic body is mounted on the outer periphery of a rectangular cylindrical frame, and a through hole in which the radioactive substance adsorption filter can be inserted and stored in the long axis direction. When the radioactive substance adsorption filter is inserted into the through hole of the housing unit, the inner wall of the through hole is urged by the elastic body, and the radioactive substance adsorption filter is fixed.
The elastic body can be provided on one or both of the outer periphery of the radioactive substance adsorption filter and the inner wall of the housing unit. By providing an elastic body, adjacent radioactive substance adsorption filters are fixed, and vibration resistance can be improved.

The radioactive substance adsorption system of the present invention is composed of at least a water intake, a water intake basin, a purification tank and a discharge port, and contaminated water containing radioactive material flows in from the water intake, passes through the water intake basin, passes through the water purification basin, and is discharged. It is a system that flows out of the outlet.
The intake trough is provided with a sludge separation wall for separating and removing sludge fallen leaves. Then, at least one of the above-described radioactive substance adsorbing devices is provided in the purification bowl. The contaminated water that has passed through the water intake trough flows through the gap between the radioactive substance adsorbing fiber substrates of the radioactive substance adsorbing filter in the radioactive substance adsorbing apparatus.
By providing a sludge separation wall in the purification tank, the contaminated water flowing in from the intake port passes through the bottom of the intake tank and moves to the purification tank, so impurities such as sludge with heavy specific gravity are removed from the intake tank. It is possible. Thereby, it can prevent that impurities, such as sludge, flow into a purification | cleaning tank, and it becomes easy to produce clogging of a filter.
Moreover, it is preferable that an opening / closing means for removing or exchanging the radioactive substance adsorption filter loaded in the radioactive substance adsorption apparatus is provided on the upper part of the purification vessel. For example, it is possible to easily remove or replace the radioactive substance adsorption filter loaded in the radioactive substance adsorption device by manually opening and closing the lining plate as the opening / closing means.

The radioactive substance adsorbing filter of the present invention has a corrugated core member composed of substantially the same waveform on one side surface of the band-shaped radioactive substance adsorbing fiber substrate carrying the radioactive substance adsorbing material. A plurality of radioactive material adsorption filters stacked at intervals, with contaminated water containing radioactive material flowing through the gap between the corrugated core members to adsorb the radioactive material on the radioactive material adsorption fiber substrate It may be possible to purify the contaminated water.
A corrugated core member composed of substantially the same corrugated shape is bonded to the strip-shaped radioactive substance adsorbing fiber base material, so that the contaminated water flows stably through the gap that is the flow path. Further, since the corrugated core member itself serves as a spacer, it is not necessary to separately provide a spacer, and processing of the radioactive substance adsorption filter and the like are facilitated. By adjusting the height of the waveform, the distance between the strip-shaped radioactive substance adsorbing fiber base materials can be adjusted, and the cross-sectional area of the flow path can also be adjusted.

The radioactive substance adsorbing filter of the present invention has a corrugated core member composed of substantially the same waveform on one side surface of the band-shaped radioactive substance adsorbing fiber substrate carrying the radioactive substance adsorbing material. A plurality of layers are stacked at intervals, the longitudinal direction is formed so that the gap between the corrugated core members extends in a cylindrical shape, and the longitudinal direction is accommodated in a rectangular cylindrical frame that is open at least at both ends in the major axis direction. The radioactive substance adsorption filter is a pollutant by adsorbing radioactive substance to the radioactive substance adsorbing fiber substrate by flowing contaminated water containing radioactive substance in the long axis direction with the gap between corrugated core members as the flow path It may be that water can be purified.
Since the radioactive substance adsorption filter is accommodated in the rectangular cylindrical frame, it can be easily used as a cartridge, and the convenience of attaching and detaching the filter is enhanced.

The radioactive substance adsorbing filter of the present invention has a band-shaped radioactive substance adsorbing fiber substrate carrying a radioactive substance adsorbing material, and a corrugated core member composed of substantially the same shape corrugated on one side surface and wound in a roll shape. This is a radioactive substance adsorption filter, and the contaminated water containing radioactive substance is flowed through the gap between corrugated core members, and the contaminated water is purified by adsorbing the radioactive substance on the radioactive substance adsorption fiber base material. It may be possible.
By making the radioactive substance adsorption filter into a roll shape, it is possible to easily produce a radioactive substance adsorption filter having a laminated structure from one filter without using a plurality of filters, thereby reducing costs. it can. In addition, when winding in roll shape, you may wind so that a corrugated core member may become an outer side, and you may wind so that a corrugated core member may become an inner side.

In the radioactive substance adsorption filter of the present invention, a strip-shaped radioactive substance adsorbing fiber substrate carrying a radioactive substance adsorbent is bonded to a corrugated core member having a substantially identical waveform on one side surface, and the waveforms are alternately orthogonal. The radioactive material adsorption filters are laminated so that the contaminated water containing the radioactive material flows through the gap between the corrugated core members and the radioactive material adsorption fiber substrate adsorbs the radioactive material. It may be possible to purify contaminated water.
By stacking the radioactive substance adsorption filter so that the corrugated core members are alternately orthogonal, two orthogonal flow paths are formed, and the contaminated water flows into the radioactive substance adsorption filter from both the vertical and horizontal directions. It becomes possible. Thereby, the radioactive substance in contaminated water can be efficiently adsorbed irrespective of the attitude of the radioactive substance adsorption filter.

In the radioactive substance adsorption filter of the present invention, the corrugated core member is preferably made of a strip-shaped radioactive substance adsorption fiber substrate carrying a radioactive substance adsorbent.
Since the corrugated core member is made of a strip-shaped radioactive substance-adsorbing fiber base material carrying a radioactive substance adsorbent, the corrugated core member itself can adsorb the radioactive substance and enhance the filter's radioactive substance adsorption performance. be able to. Further, since it is not necessary to provide a separate spacer, it is possible to reduce the weight as compared with a filter provided with a spacer.
Since the radioactive substance adsorbing fiber base material used as the corrugated core member is formed into a wave shape, it is possible to attach a member longer than the case where it is installed in a band shape. Thereby, the contact area of contaminated water and a base material can be enlarged, and it becomes possible to process a lot of contaminated water effectively.

  Here, it is preferable that the radioactive substance adsorbent is Prussian blue analog or Prussian blue which mainly performs adsorption removal of cesium.

In the radioactive substance adsorbing device of the present invention, a plurality of any of the above radioactive substance adsorbing filters are accommodated in a net-like container, one end of a rope-like recovery member is connected to the net-like container, and the other end is fixed to an external device. It may be possible.
By using the net-like container, the device itself can be easily deformed and can be installed in a wide range of places. Moreover, installation and collection | recovery work become easy by providing a rope-shaped collection | recovery member.

  According to the radioactive substance adsorption filter and the radioactive substance adsorption device of the present invention, there is an effect that a large amount of contaminated water containing the radioactive substance can be purified in a short time.

The perspective view of the radioactive substance adsorption filter of Example 1 Structure explanatory drawing of the radioactive substance adsorption cloth of Example 1 Explanatory drawing of the radioactive substance adsorption cloth of Example 1 Explanatory drawing of the radioactive substance adsorption filter of Example 1 The perspective view of the radioactive substance adsorption filter of Example 1 The top view of the radioactive substance adsorption filter of Example 1 FIG. 1 is a perspective view of a radioactive substance adsorbing apparatus according to a first embodiment. FIG. 2 is a perspective view of the radioactive substance adsorbing apparatus according to the first embodiment. Explanatory drawing of the radioactive substance adsorption system of Example 1 The perspective view of the radioactive substance adsorption filter of Example 2 The top view of the radioactive substance adsorption filter of Example 2 It is explanatory drawing of the radioactive substance adsorption sheet of Example 2, (1) shows the radioactive substance adsorption sheet of Example 2, (2) has shown the radioactive substance adsorption cloth. The top view of the radioactive substance adsorption filter of Example 3 The perspective view of the radioactive substance adsorption filter of Example 3 Explanatory drawing of the radioactive substance adsorption system of Example 3 The perspective view of the radioactive substance adsorption filter of Example 4 Explanatory drawing of the radioactive substance adsorption filter of Example 4 Explanatory drawing of the radioactive substance adsorption system of Example 4

  Hereinafter, an example of an embodiment of the present invention will be described in detail with reference to the drawings. The scope of the present invention is not limited to the following examples and illustrated examples, and many changes and modifications can be made.

FIG. 1 shows a perspective view of the radioactive substance adsorption filter of Example 1. FIG. As shown in FIG. 1, the filter 1 includes a radioactive substance adsorbing cloth 2, a frame 3, and a spacer 4.
The filter 1 can be used by being loaded into the apparatus main body 9 of the radioactive substance adsorbing apparatus 8 shown in FIGS. 7 and 8, or the filter 1 can be used by being installed in, for example, a water channel. Is also possible.

FIG. 2 is a diagram illustrating the structure of the radioactive substance adsorbing cloth of Example 1. As shown in FIG. 2, the radioactive substance adsorbing cloth 2 is a rectangular and vertically long belt-like body, and is arranged in parallel with a certain interval so that the surfaces are adjacent to each other. This is a structure in which contaminated water is caused to flow from above into the gap 6 generated thereby to adsorb radioactive substances.
The distance P between the surfaces is appropriately adjusted according to the amount of contaminated water to be treated, the distance of the gap 6 that is the flow path, and the adsorption performance of the radioactive substance adsorbing cloth 2, but in this embodiment, it is 1.2 mm. There is an interval.

  FIG. 3 is an explanatory diagram of the radioactive substance adsorbing cloth of Example 1. As shown in FIG. 3, a gap 6 is provided between the radioactive substance adsorbing cloth 2a and the radioactive substance adsorbing cloth 2b, and the contaminated water 5 flows from the top to the bottom. Similarly, a gap 6 is also provided between the radioactive substance adsorbing cloth 2b and the radioactive substance adsorbing cloth 2c, or between the radioactive substance adsorbing cloth 2c and the radioactive substance adsorbing cloth 2d. The contaminated water 5 flows to the lower part. The contaminated water 5 that has flowed into the filter 1 flows alongside the radioactive substance adsorbing cloth 2, so that the radioactive substance in the contaminated water 5 is adsorbed on the radioactive substance adsorbing cloth 2 and purified water 7 from which the radioactive substance has been removed. It is a structure that is discharged.

FIG. 4 is an explanatory diagram of the radioactive substance adsorption filter of Example 1. FIG. FIG. 5 shows a perspective view of the radioactive substance adsorption filter of Example 1. FIG. FIG. 6 shows a plan view of the radioactive substance adsorption filter of Example 1. FIG.
As shown in FIG. 4, spacers 4 are provided on both the left and right ends of the radioactive substance adsorbing cloth 2 in the vertical direction. As shown in FIG. 5, the spacer 4 is bonded and fixed so as to sandwich the radioactive substance adsorbing cloth 2. Therefore, as shown in FIG. 6, when the radioactive substance adsorbing cloth 2 is overlapped, a structure is provided that provides a gap between the radioactive substance adsorbing cloths 2.

  FIG. 7 shows a perspective view of the radioactive substance adsorbing apparatus of the first embodiment. As shown in FIG. 7, the apparatus main body 9 of the radioactive substance adsorbing apparatus 8 is provided with 16 insertion holes 9a in which a filter 1 can be inserted and fixed in a lattice shape. The apparatus main body 9 is formed of a stainless steel plate.

  FIG. 8 is a perspective view of the radioactive substance adsorbing apparatus of the first embodiment. As shown in FIG. 8, since the filter 1 is installed by inserting and fixing one by one in the insertion hole 9a, it is possible to replace and use only a filter having a reduced radioactive substance adsorption performance.

FIG. 9 shows an explanatory diagram of the radioactive substance adsorption system of the first embodiment. As shown in FIG. 9, the radioactive substance adsorption system 50 includes a radioactive substance adsorption system main body 51, a radioactive substance adsorption device 8, a water intake 52, a purification tank 53, a discharge port 54, a sludge separation wall 55, a water intake 56 and a cover. It consists of a work plate 57.
The radioactive substance adsorption system main body 51 is provided in the ground below the ground surface 10, and a water intake basin 52 and a purification basin 53 are provided inside, and the water intake basin 52 is provided with a separation wall 55 such as sludge.
By providing the separation wall 55 such as sludge in the purification tank 53, the contaminated water 5 flowing in from the intake port 56 passes through the bottom of the intake tank 52 and moves to the purification tank 53. It is possible to remove impurities such as heavy sludge. As a result, it is possible to prevent impurities such as sludge from flowing into the purification tank 53 and easily causing clogging of the filter.

In the purifier 53, two radioactive substance adsorbing devices 8 are provided in series in the vertical direction. The radioactive substance adsorption device 8 has a structure that can be removed by opening the cover plate 57.
In this embodiment, two radioactive substance adsorbing devices 8 are installed in series. This is because the radioactive substance removal performance is enhanced by removing the radioactive substance twice. Since the radioactive substance adsorbing device 8 can perform sufficient radioactive substance adsorption even if it is not a plurality of serial arrangements, it may be a single unit or three or more units. Moreover, you may install not parallel but parallel. By arranging in parallel, a larger amount of contaminated water can be treated quickly.
The purified water 7 from which the radioactive substance has been removed by the radioactive substance adsorption device 8 is discharged through the outlet 54.

  FIG. 10 is a perspective view of the radioactive substance adsorption filter according to the second embodiment. As shown in FIG. 10, the filter 1 a includes a radioactive substance adsorbing sheet 20 and a frame 3. The same frame 3 as that of the first embodiment can be used. However, unlike the first embodiment, the filter 1 a is not provided with the spacer 4. This is because, unlike Example 1, the radioactive substance adsorbing sheet 20 is provided with a corrugated core member 21.

FIG. 11 is a plan view of the radioactive substance adsorption filter according to the second embodiment. As shown in FIG. 11, the radioactive substance adsorbing sheet 20 includes a radioactive substance adsorbing cloth 2 and a corrugated core member 21, and a plurality of radioactive substance adsorbing sheets 20 are stacked inside the frame 3. Since the corrugated core member 21 is made of the same material as the radioactive substance adsorbing cloth 2, not only the radioactive substance adsorbing cloth 2 but also the corrugated core member 21 adsorbs radioactive substances contained in the contaminated water. Is possible.
The corrugated core member 21 also serves as a spacer that creates a gap 6 between the radioactive material adsorbing sheets 20. For this reason, the contaminated water flow path can be secured without using the spacer 4 as in the first embodiment.

FIG. 12 is an explanatory diagram of the radioactive substance adsorbing sheet of Example 2. FIG. 12 (1) shows a cross-sectional view in which radioactive material adsorbing sheets (20e, 20f) are laminated as an example. As shown in FIG. 12 (1), the radioactive substance adsorbing sheet 20e includes a radioactive substance adsorbing cloth 2e and a corrugated core member 21e. Although not shown, the radioactive substance adsorbing cloth 2e and the corrugated core member 21e are bonded with an adhesive. Similarly, the radioactive substance adsorbing cloth 2f and the corrugated core member 21f are bonded together.
The corrugated core members (21e, 21f) are provided to create a gap 6 between the sheets so that contaminated water can easily flow in. Therefore, the radioactive substance adsorbing sheet 20e and the radioactive substance adsorbing sheet 20f are provided. There is no need for bonding, and no bonding is performed. However, in order to improve convenience such as transportation and attachment of the radioactive substance adsorbing sheet 20, it may be bonded.

In FIG. 12 (2), for comparison with Example 2, a material obtained by simply laminating radioactive material adsorbing cloth (2g to 2j) is shown. Comparing FIG. 12 (1) and (2), the length _{L 1} of the radioactive material suction sheet (20e, 20f), the length _{L 2} of the radioactive substance-adsorbing cloth (2G～2j) is the same length However, the corrugated core member (21e, 21f) is long because it is shaped into a corrugated shape. Therefore, the radioactive substance adsorbing sheet (20e, 20f) has a larger contact area with the contaminated water than the radioactive substance adsorbing cloth (2g to 2j), and can treat more contaminated water effectively. It has a simple structure.

FIG. 13 is a plan view of the radioactive substance adsorption filter of Example 3. FIG. As shown in FIG. 13, the filter 1 b includes a radioactive substance adsorbing cloth 2 and a corrugated core member 21. Specifically, the surface of the radioactive substance adsorbing sheet 20 shown in Example 2 on which the corrugated core member 21 is provided is turned outward and rolled into a roll shape. As a method for forming the roll, not only the outer winding with the waveform as shown in FIG. 13 facing outward, but also any of the inner winding with the surface provided with the corrugated core member 21 of the radioactive substance adsorbing sheet 20 inward. A method is also available.
Since a large number of gaps 6 are provided in the filter 1b, the contaminated water flowing through the gaps 6 can easily touch the radioactive substance adsorbing cloth, and a large amount of contaminated water can be treated effectively.

FIG. 14 is a perspective view of the radioactive substance adsorption filter according to the third embodiment. As shown in FIG. 14, the filter 1b has the shape of a cylindrical and a height _{H 1} is 150 mm, the diameter R has a 150 mm. The filter 1b can be shaped by freely adjusting the size by changing the length and width of the radioactive substance adsorbing sheet 20 to be used.

FIG. 15 is an explanatory diagram of the radioactive substance adsorbing apparatus according to the third embodiment. As shown in FIG. 15, the radioactive substance adsorbing device 11 includes a plurality of filters 1 b, a net-like container 12 and a rope 13, and the filter 1 b is put in the net-like container 12. The net-like container 12 is provided with a collection rope 13.
The radioactive substance adsorbing device 11 is disposed in the purification tank 53. The purifier 53 has a structure in which the contaminated water 5 flows from the water intake 56 and the purified water 7 flows out to the discharge port 54.

When the radioactive substance adsorbing device 11 is installed in the purifier 53, the grating 58 is removed and the radioactive substance adsorbing device 11 is submerged in the purifier 53. Unlike the radioactive substance adsorbing device 8 in the first embodiment, since the net-like container is formed of a soft material, it can be easily deformed and can be installed in accordance with the shape of the purification basket 53. Moreover, as shown in FIG. 15, it is also possible to install two radioactive substance adsorption | suction apparatuses 11 in piles. It is possible to install three or more depending on the shape of the installation location.
At the time of recovery, the recovery can be easily performed by grasping and pulling up the recovery rope 13 provided in each radioactive substance adsorption device 11. Further, the recovery rope 13 also plays a role of preventing clogging of the piping such as the radioactive substance adsorbing device 11 flowing and blocking the discharge port 54.

FIG. 16 is a perspective view of the radioactive substance adsorption filter according to the fourth embodiment. As shown in FIG. 16, the filter 1 c includes a plurality of radioactive substance adsorbing sheets 20, and the radioactive substance adsorbing sheet 20 includes the radioactive substance adsorbing cloth 2 and a corrugated core member 21. Specifically, the radioactive substance adsorbing sheets 20 are laminated so that the waveforms of the corrugated core members 21 provided in the radioactive substance adsorbing sheet 20 shown in Example 2 are alternately orthogonal. Further, the spacer 4 is not provided in the filter 1c, as in the second or third embodiment.
Since a large number of gaps 6 are provided in the filter 1c, the contaminated water flowing through the gaps 6 can easily touch the radioactive substance adsorbing cloth, and a large amount of contaminated water can be treated effectively.
Height _{H 2} of the filter 1c is 150 mm, the width w 150 mm, the depth D is a 150 mm, has a substantially cubic shape. The filter 1c can be shaped by freely adjusting the size by changing the length and width of the radioactive material adsorbing sheet 20 to be used. That is, the shape of the filter 1c is not limited to the substantially cubic shape, for example, in order to increase the portion where contaminated water flows, it is also possible to provide a higher height H _2. Here, the waveforms are stacked so that the waveforms are alternately orthogonal to each other, but it is not always necessary to change the stacking direction for each sheet. For example, the stacking direction may be changed for every two sheets.

FIG. 17 is an explanatory diagram of the radioactive substance adsorption filter of Example 4. As shown in FIG. 17, the filter 1c is laminated so that the waveforms are alternately orthogonal. Here, the radioactive substance adsorption sheet (20k-20n) is represented in a stacked state.
As shown in FIG. 17, the radioactive substance adsorbing sheet 20k includes a radioactive substance adsorbing cloth 2k and a corrugated core member 21k. Similarly, the radioactive substance adsorbing sheet 20l is the radioactive substance adsorbing cloth 2l and the corrugated core member 21l, the radioactive substance adsorbing sheet 20m is the radioactive substance adsorbing cloth 2m and the corrugated core member 21m, and the radioactive substance adsorbing sheet 20n is the radioactive substance adsorbing cloth 2n. And a corrugated core member 21n.
Although not shown, the radioactive substance adsorbing cloth 2k and the corrugated core member 21k are bonded with an adhesive. Similarly, the radioactive substance adsorbing cloth 21 and the corrugated core member 21l, the radioactive substance adsorbing cloth 2m and the corrugated core member 21m, and the radioactive substance adsorbing cloth 2n and the corrugated core member 21n are also bonded by an adhesive.

The radioactive substance adsorbing sheets (20k to 20n) are laminated so that the waveforms are alternately orthogonal. That is, the radioactive substance adsorbing sheet 20k and the radioactive substance adsorbing sheet 20l, the radioactive substance adsorbing sheet 20l and the radioactive substance adsorbing sheet 20m, and the radioactive substance adsorbing sheet 20m and the radioactive substance adsorbing sheet 20n are laminated so that the waveforms are alternately orthogonal to each other. ing.
Unlike Example 2, the radioactive substance adsorbing sheets 20 are also bonded to each other by an adhesive (not shown). That is, the radioactive substance adsorbing sheet 20k and the radioactive substance adsorbing sheet 20l, the radioactive substance adsorbing sheet 20l and the radioactive substance adsorbing sheet 20m, and the radioactive substance adsorbing sheet 20m and the radioactive substance adsorbing sheet 20n are bonded together with an adhesive.

The radioactive substance adsorbing sheets (20k to 20n) are provided with the corrugated core members (21k to 21n) to form gaps (6a, 6c). Further, the gaps (6b, 6d) are formed by stacking the radioactive substance adsorbing sheets (20k to 20n). These gaps (6a to 6d) serve as contaminated water flow paths. Arrows (15a, 15b) indicate the inflow direction of contaminated water or the outflow direction of purified water.
As shown in FIG. 17, by providing the radioactive substance adsorbing sheet (20k, 20m), it is possible to inflow of contaminated water or outflow of purified water in the direction of arrow 15a through the gaps (6a, 6b). Become. Further, by providing the radioactive substance adsorbing sheets (20l, 20n), the contaminated water can flow in or the purified water can flow out in the direction of the arrow 15b through the gaps (6c, 6d).
Thus, by laminating so that the waveforms of the radioactive substance adsorbing sheets (20k to 20n) are alternately orthogonal, two orthogonal directions of flow paths are created, and the contaminated water is adsorbed from both the vertical and horizontal directions. It is possible to flow into the filter. Thereby, the radioactive substance in contaminated water can be efficiently adsorbed irrespective of the attitude of the radioactive substance adsorption filter.

FIG. 18 is an explanatory diagram of the radioactive substance adsorption system according to the fourth embodiment. As shown in FIG. 18, the radioactive substance adsorbing device 14 includes a plurality of filters 1 c, a net-like container 12 and a rope 13, and the filter 1 c is placed in the net-like container 12. The net-like container 12 is provided with a collection rope 13.
The radioactive substance adsorbing device 14 is disposed in the purification tank 53. The purifier 53 has a structure in which the contaminated water 5 flows from the water intake 56 and the purified water 7 flows out to the discharge port 54.

When the radioactive substance adsorbing device 14 is installed in the purification vessel 53, the grating 58 is removed and the radioactive substance adsorbing device 14 is submerged in the purification vessel 53. Similar to the third embodiment, since the net-like container is formed of a soft material, it can be easily deformed and can be installed in accordance with the shape of the purification basket 53. Moreover, as shown in FIG. 18, it is also possible to install two radioactive substance adsorption | suction apparatuses 14 in piles. It is possible to install three or more depending on the shape of the installation location.
At the time of recovery, the recovery can be easily performed by grasping and pulling up the recovery rope 13 provided in each radioactive substance adsorption device 14. Further, the recovery rope 13 also plays a role of preventing clogging of the piping such as the radioactive substance adsorbing device 14 flowing and blocking the discharge port 54.

  The radioactive substance adsorption device 14 is similar to the radioactive substance adsorption device 11 in the third embodiment in terms of structure and usage, but in the case of the filter 1c constituting the radioactive substance adsorption device 14, the corrugated core member 21 Since the waveforms are stacked so as to be alternately orthogonal, there is an advantage that the radioactive substance can be efficiently adsorbed regardless of the attitude of the radioactive substance adsorption filter.

  The present invention is useful for a purification treatment facility for contaminated water containing radioactive substances.

DESCRIPTION OF SYMBOLS 1,1a-1c Filter 2,2a-2n Radioactive material adsorption cloth 3 Frame 4 Spacer 5 Contaminated water 6, 6a-6d Gap 7 Purified water 8, 11, 14 Radioactive material adsorption device 9 Insertion hole 10 Ground surface 12 Net shape Container 13 Recovery rope 15a, 15b Arrow 20, 20e, 20f Radioactive material adsorption sheet 21, 21e, 21f Corrugated core member 50 Radioactive material adsorption system 51 Radioactive material adsorption system main body 52 Intake trough 53 Purifier 54 Discharge port 55 Sludge etc. separation Wall 56 Water intake 57 Covering plate 58 Grating D Depth H Height L Length P Interval R Diameter W Width

Claims (12)

A plurality of strip-shaped radioactive substance-adsorbing fiber substrates carrying a radioactive substance adsorbing material are stacked at an appropriate interval and stored in a rectangular cylindrical frame having at least both ends in the major axis direction aligned with the major axis direction. A radioactive material adsorption filter,
An elastic body is attached to the outer peripheral part of the rectangular cylindrical frame, and the radioactive substance adsorption filters adjacent to each other through the elastic body are fixed,
Using the gap between the radioactive substance-adsorbing fiber base material as a flow path, contaminated water containing the radioactive substance is flowed in the long axis direction, and the radioactive substance can be purified by adsorbing the radioactive substance on the radioactive substance-adsorbing fiber base material The radioactive substance adsorption filter characterized by the above-mentioned.   2. The radioactive substance according to claim 1, wherein a plurality of the radioactive substance-adsorbing fiber base materials are laminated at an appropriate interval by fixing spacers extending in the longitudinal direction on both sides of the belt. Adsorption filter.   The radioactive substance adsorbing filter according to claim 1 or 2, wherein the radioactive substance adsorbing material is a Prussian blue analog that mainly adsorbs and removes cesium.   The radioactive substance adsorption filter according to claim 3, wherein the interval between the radioactive substance adsorption fiber base materials is in a range of 0.5 to 2.5 mm.   The radioactive substance adsorption filter according to claim 3, wherein the Prussian blue analog is Prussian blue.   The radioactive substance adsorption filter according to any one of claims 1 to 5, wherein the radioactive substance adsorption fiber substrate is a nonwoven fabric, a woven fabric, or a thread.   The radioactive substance adsorption filter according to claim 1, wherein the elastic body is a plate spring, an elastically deformable resin spring, a tension spring, or a compression spring.   A radioactive substance adsorbing apparatus, wherein a plurality of the radioactive substance adsorption filters according to any one of claims 1 to 7 are bundled with the major axis direction aligned. The radioactive substance adsorption filter according to any one of claims 1 to 7,
A radioactive substance adsorption device comprising: a housing unit provided with a through-hole through which the radioactive substance adsorption filter can be inserted and stored in the long axis direction. The radioactive substance adsorption filter according to any one of claims 1 to 7,
A housing unit provided with a through-hole capable of inserting and storing the radioactive substance adsorption filter in the long axis direction;
When the radioactive substance adsorption filter is inserted through the through hole, the inner wall of the through hole is urged by the elastic body, and the radioactive substance adsorption filter is fixed. In a system that is composed of at least a water intake, a water intake basin, a purification basin, and a discharge port, and contaminated water containing radioactive materials flows from the water intake, passes through the water intake basin, passes through the water purification basin, and flows out from the discharge port.
The intake trough is provided with a sludge separation wall for separating and removing sludge litter,
At least one radioactive substance adsorbing device according to any one of claims 8 to 10 is provided in the purification tank,
Contaminated water that has passed through a water intake basin is flowed through a gap between the radioactive substance-adsorbing fiber substrates of the radioactive substance-adsorbing filter in the radioactive substance-adsorbing device as a flow path.   The radioactive substance adsorption according to claim 11, wherein an opening / closing means for removing or replacing the radioactive substance adsorption filter loaded in the radioactive substance adsorption device is provided at an upper part of the purification vessel. system.