JP2019007746A - Adsorption tower and treatment liquid discharge method thereof - Google Patents

Abstract

To provide an adsorption tower which discharges only a treatment liquid from an adsorption tower body and can store a used adsorbent in the adsorption tower body.SOLUTION: An adsorption tower 1 according to the embodiment comprises: a shielding container 2; an adsorption tower body 3 stored in the shielding container 2; a lower part screen 7 being an isolating part causing the treatment liquid to pass, and isolating an adsorbent storage part 15 storing an adsorbent 14 in the adsorption tower body 3 from a treatment liquid storage part 16 storing the treatment liquid subjected to adsorption treatment by the adsorbent 14; a contaminated liquid inflow nozzle 17 whose upper end part penetrates through an upper part of the adsorption tower body 3 and a shielding lid 2a and extends to the outside of the shielding container 2, and allowing the contaminated liquid to flow into the adsorption tower body 3; and a treatment liquid outflow nozzle 18 whose upper end part penetrates through the upper part of the adsorption tower body 3 and the shielding lid 2a and extends to the outside of the shielding container 2, and whose lower end part extends to the treatment liquid storage part 16 in the adsorption tower body 3, and allowing the treatment liquid to flow out.SELECTED DRAWING: Figure 1

Description

  Embodiments of the present invention relate to an adsorption tower that adsorbs a radioactive substance contained in a contaminated liquid generated from, for example, power plant equipment by an adsorbent, and a processing liquid discharge method thereof.

  Examples of apparatuses for removing radioactive substances from a contaminated liquid contaminated with radioactive substances include the following apparatuses. In this device, a container with a double cylinder structure consisting of an inner cylinder and an outer cylinder for filling the adsorbent is housed in the outer container, and the contaminated liquid contaminated with radioactive material is filled with the adsorbent. The radioactive material is removed by circulating from the inner cylinder through the outer cylinder to the inner cylinder via the outer container.

  In this apparatus, since the inner cylinder outlet, the outer cylinder outlet, and the outer container outlet are provided at predetermined heights, the processing liquid in which radioactive substances are removed from the inner cylinder, outer cylinder, and outer container after the operation is completed. Will remain.

  There is also an ion exchange resin tower that removes both the used resin and the treatment liquid after the chemical decontamination work is completed. In this ion exchange resin tower, the resin tower main body is accommodated in a shielding container that shields radiation, and the ion exchange resin is accommodated in the resin tower main body. From the decontamination liquid chemically decontaminated by this ion exchange resin. Metal ions are adsorbed and filtered.

JP2013-210209A Japanese Patent No. 4421643

  By the way, in an apparatus in which the processing liquid remains after the work is completed, since the processing liquid contains, for example, seawater and groundwater, if the processing liquid remains, it causes corrosion in the inner cylinder, the outer cylinder, and the outer container, and is durable. There is a problem that becomes low.

  In the ion exchange resin tower, both the used resin and the treatment liquid are removed after the chemical decontamination work is completed, so that the problem of corrosion in the resin tower body is eliminated, but the use of the removed radiation dose is high. In order to store the used resin and the processing liquid, a new storage container for shielding radiation is required, and there is a problem that the apparatus becomes large.

  The problem to be solved by the present embodiment is to provide an adsorption tower that can discharge only the treatment liquid from the main body of the adsorption tower and store the used adsorbent in the main body of the adsorption tower, and a method for discharging the treatment liquid. For the purpose.

  In order to solve the above problems, an adsorption tower according to the present embodiment adsorbs the radioactive substance from a contaminated liquid containing a radioactive substance with an adsorbent and discharges the treated liquid. A shielding lid for closing an upper end opening of the shielding container; an adsorption tower main body accommodated in the shielding container; an adsorbent accommodating part for accommodating the adsorbent in the adsorption tower main body; and the radioactive substance by the adsorbent. Is separated from the processing liquid storage part for storing the processing liquid subjected to the adsorption treatment, and the separation part for allowing the processing liquid to pass through, and the upper end part passes through the upper part of the main body of the adsorption tower and the shielding cover, and is outside the shielding container. A contaminated liquid inflow nozzle for flowing the contaminated liquid into the adsorption tower main body, and an upper end portion extending through the upper portion of the adsorption tower main body and the shielding lid and extending out of the shielding container, and a lower end portion of the adsorption tower main body. In the tower body It extends serial processing liquid containing portion, characterized in that it comprises a treatment liquid outlet nozzles for the outflow of the treatment liquid.

  The treatment liquid discharge method for an adsorption tower according to the present embodiment is the method for adsorbing the radioactive substance from a contaminated liquid containing a radioactive substance with an adsorbent, and discharging the treatment liquid. A contaminated liquid inflow process for allowing the contaminated liquid to flow into the main body of the adsorption tower housed in a shielding container from the contaminated liquid inflow nozzle, and passing the adsorbent in the main body of the adsorption tower to absorb the contaminated liquid to obtain a treatment liquid. An adsorption process; and a treatment liquid inflow process for allowing the treatment liquid to flow into the treatment liquid storage part via an isolation part that separates the adsorption material storage part for accommodating the adsorption material and the treatment liquid storage part for containing the treatment liquid; And a treatment liquid outflow step for flowing out of the adsorption column main body from the treatment liquid storage section through the treatment liquid outflow nozzle.

  According to this embodiment, it becomes possible to discharge only the treatment liquid from the adsorption tower body and store the used adsorbent in the adsorption tower body.

It is a longitudinal section showing a 1st embodiment of an adsorption tower concerning the present invention. FIG. 2 is a partial cross-sectional front view showing an upper screen and a lower screen of FIG. 1. It is a longitudinal cross-sectional view which shows 2nd Embodiment of the adsorption tower which concerns on this invention. It is a cross-sectional view showing a third embodiment of the adsorption tower according to the present invention. It is an expanded longitudinal cross-sectional view which shows the lower part of the adsorption tower main body of FIG.

  Hereinafter, an adsorption tower and a treatment liquid discharging method thereof according to the present embodiment will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a longitudinal sectional view showing a first embodiment of an adsorption tower according to the present invention. FIG. 2 is a partial cross-sectional front view showing the upper screen and the lower screen of FIG.

  As shown in FIG. 1, the adsorption tower 1 has a shielding container 2 that is integrally formed in a bottomed cylindrical shape with, for example, a steel plate or a lead plate, and shields radiation. In this shielding container 2, an adsorption tower body 3 made of, for example, stainless steel is accommodated. The upper opening of the shielding container 2 is closed by a shielding lid 2a that shields radiation.

  The adsorption tower main body 3 includes a body 4 formed in a cylindrical shape, a dish-shaped upper end plate 5 that closes the upper end opening of the body 4, and a dish-shaped lower end plate 6 that closes the lower end opening of the body 4. And.

  On the upper surface of the lower end plate 6, a lower screen 7 serving as a separating portion and a filter portion having a diameter smaller than that of the adsorption tower body 3 and having a cylindrical shape is installed concentrically with the adsorption tower body 3 in a plan view. Similarly, an upper screen 11 as a filter part having a smaller diameter than the adsorption tower body 3 and having a cylindrical shape is installed on the lower surface of the upper end plate 5.

  The lower screen 7 and the upper screen 11 have the same structure. As shown in FIG. 2, the lower screen 7 and the upper screen 11 are each provided with a wedge wire 13 having a filter function between the upper and lower end plates 12a and 12b.

  The end plate 12a is formed in a circular ring shape. The end plate 12b is formed in a disc shape. The wedge wire 13 is, for example, a slit formed by arranging irregular lines having an inverted triangular cross-sectional shape at equal intervals. The wedge wire 13 does not allow the adsorbent 14 to pass through, but allows the adsorbent 14 to adsorb the radioactive substance and pass only the treatment liquid. The wedge wire 13 is arranged so that the plane portion side of the cross-sectional shape of the inverted triangle is located on the adsorbent 14 side.

  Therefore, each of the lower screen 7 and the upper screen 11 of the present embodiment has an outer peripheral side that is a plane portion side of an inverted triangle of the wedge wire 13.

  In the present embodiment, as shown in FIG. 1, the lower screen 7 is arranged so that the end plate 12b is on the upper side and the end plate 12a is on the lower side. For this reason, the inside of the lower screen 7 and the lower screen 7 and the lower end plate 6 are in communication with each other. Contrary to the lower screen 7, the upper screen 11 is disposed such that the end plate 12b is on the lower side and the end plate 12a is on the upper side.

  Inside the adsorption tower body 3, the outside of the lower screen 7 forms an adsorbent storage portion 15 in which the adsorbent 14 is stored. The adsorbent 14 is for adsorbing a radioactive substance from a contaminated liquid containing the radioactive substance. Between the lower screen 7 and between the lower screen 7 and the lower end plate 6, a processing liquid storage part (water chamber) 16 that stores the processing liquid adsorbed by the adsorbent 14 is formed. The lower screen 7 of this embodiment does not allow the adsorbent 14 to pass from the outside to the inside, but allows only the processing liquid that has been subjected to the adsorption treatment by the adsorbent 14 to pass from the outside to the inside.

  Therefore, the lower screen 7 of the present embodiment serves as an isolation part that isolates the adsorbent storage unit 15 that stores the adsorbent 14 and the processing liquid storage unit 16 that stores the processing liquid adsorbed by the adsorbent 14. It has a function.

  As the adsorbent 14, for example, zeolite, crystalline silicon titanate, silicotitanate, activated carbon, titanate, ferrocyan compound, titanium oxide, Ag-impregnated activated carbon, resin-based adsorbent containing chelate resin or ion exchange resin, etc. Is mentioned. The ion exchange resin is used for chemical decontamination, and for example, a cation resin or an anion resin is used. The adsorbent 14 for chemical decontamination includes chemicals and chemical products (tablets).

  A lower end portion of a tubular contaminant liquid inflow nozzle 17 is connected to the upper portion of the upper screen 11. The upper end portion of the contaminated liquid inflow nozzle 17 passes through the upper end plate 5 and the shielding lid 2a and extends to the outside of the shielding container 2 (outside the shielding lid 2a), and the contaminated liquid inflow nozzle 17 is provided with an inflow valve 17a. . In the contaminated liquid inflow nozzle 17, the contaminated liquid at the time of the radioactive substance adsorption processing operation of the contaminated liquid flows.

  A tubular processing liquid outflow nozzle 18 extending in the vertical direction is installed in the adsorption tower body 3. The upper end portion of the processing liquid outflow nozzle 18 passes through the upper end plate 5 and the shielding lid 2a and extends outside the shielding container 2 (outside the shielding lid 2a). The processing liquid outflow nozzle 18 is provided with an outflow valve 18a. ing. A lower end portion of the processing liquid outflow nozzle 18 extends through the end plate 12 b of the lower screen 7 to the processing liquid storage portion 16 in the lower screen 7.

  Further, a tubular drain liquid outflow nozzle 20 extending in the vertical direction is installed in the adsorption tower body 3. The upper end portion of the drain liquid outflow nozzle 20 passes through the upper end panel 5 and the shielding lid 2a and extends outside the shielding container 2 (outside the shielding lid 2a). The drain liquid outflow nozzle 20 is provided with an outlet valve 20a. ing. The lower end portion of the drain liquid outflow nozzle 20 passes through the lower screen 7 in the vertical direction and opens directly above the central portion which is the deepest portion in the lower end plate 6.

  Next, the operation of this embodiment will be described.

  At the time of the radioactive substance adsorption processing operation of the contaminated liquid, first, the outlet valve 20a of the drain liquid outflow nozzle 20 is closed. Further, the inflow valve 17a of the contaminated liquid inflow nozzle 17 and the outflow valve 18a of the processing liquid outflow nozzle 18 are open.

  And the contaminated liquid at the time of the radioactive substance adsorption processing operation of the contaminated liquid is caused to flow into the adsorption tower body 3 from the contaminated liquid inflow nozzle 17. Here, the contaminated liquid is a contaminated liquid caused by, for example, fuel piping and equipment in facilities in a nuclear power plant.

  The contaminated liquid that has flowed into the adsorption tower main body 3 is subjected to adsorption treatment of the radioactive substance through the adsorbent 14 accommodated in the adsorbent accommodating portion 15. The processing liquid that has passed through the adsorbent 14 passes through the lower screen 7 and flows into the processing liquid storage section 16, and then flows into the processing liquid outflow nozzle 18 from the processing liquid storage section 16. Further, the processing liquid flows out of the shielding container 2 from the processing liquid outflow nozzle 18 and is stored in a processing liquid storage tank (not shown). This processing liquid is reused, for example, as cooling water for an object to be cooled, or stored while waiting for the next processing.

  In this way, the contaminated liquid passes through the adsorbent 14 to become a processing liquid in which the radioactive substance is adsorbed and flows into the processing liquid outflow nozzle 18 from the processing liquid storage unit 16 without staying in the adsorption tower body 3. And immediately flows out of the shielding container 2.

  At the end of the radioactive substance adsorption processing operation, the outlet valve 20a of the drain liquid outflow nozzle 20 is opened and the outflow valve 18a of the processing liquid outflow nozzle 18 is closed. Next, a cleaning liquid is injected into the adsorption tower main body 3 from the contaminated liquid inflow nozzle 17 to replace the remaining processing liquid, and then compressed air is introduced to remove the processing liquid in the adsorption tower main body 3 from the drain liquid outflow nozzle 20. To discharge from. Alternatively, the processing liquid is discharged by evacuating the drain liquid outflow nozzle 20.

  Thereafter, the discharge operation is performed several times, it is confirmed that there is no remaining treatment liquid, and the discharge operation is stopped when all the remaining treatment liquid is discharged.

  In this case, since the lower end portion of the drain liquid outflow nozzle 20 is opened immediately above the central portion, which is the deepest portion in the lower end plate 6, all of the remaining processing liquid passes through the drain liquid outflow nozzle 20 to the outside of the shielding container 2. Discharged.

  When the adsorption effect of the adsorbent 14 is lost, the adsorbent 14 that has adsorbed the radioactive substance is stored in the adsorption tower body 3 and the adsorption tower body 3 is stored in the shielding container 2. Stored. And a contaminated liquid is processed through the process similar to the above using another new adsorption tower 1.

  As described above, according to the present embodiment, the adsorbent storage unit 15 that stores the adsorbent 14 and the processing liquid storage unit 16 that stores the processing liquid adsorbed by the adsorbent 14 are separated by the lower screen 7. Since the lower end portion of the processing liquid outflow nozzle 18 extends to the processing liquid storage section 16 in the lower screen 7, only the processing liquid can be discharged from the adsorption tower body 3, so that it is used in the adsorption tower body 3. The adsorbent 14 can be stored. Therefore, the inside of the adsorption tower body 3 is not always exposed to the remaining processing liquid, so that the possibility that the inner surface of the adsorption tower body 3 is corroded can be reduced. As a result, the durability of the adsorption tower body 3 can be improved. Furthermore, it is possible to reduce the possibility of leakage of the remaining liquid during long-term storage.

  Further, according to the present embodiment, the adsorbent 14 that has adsorbed the radioactive substance is stored in the adsorption tower body 3 and is stored in a state where the adsorption tower body 3 is stored in the shielding container 2. A new storage container for storing the adsorbent 14 having a high radiation dose that adsorbs the substance becomes unnecessary, and it is possible to prevent the apparatus from becoming large.

  Furthermore, according to the present embodiment, the lower end portion of the drain liquid outflow nozzle 20 passes through the lower screen 7 in the vertical direction and opens directly above the central portion, which is the deepest portion in the lower end plate 6, so It is possible to greatly reduce the processing liquid to be used.

  Moreover, according to this embodiment, since the lower screen 7 and the upper screen 11 are comprised by the same structure, the kind of member is reduced and manufacture becomes easy. And since the shielding container 2 is shape | molded integrally, the manufacturing process of the shielding container 2 can be reduced and the simplification of a structure can be aimed at.

(Second Embodiment)
FIG. 3 is a longitudinal sectional view showing a second embodiment of the adsorption tower according to the present invention. The present embodiment is a modification of the first embodiment. The same or corresponding parts as those in the first embodiment are denoted by the same reference numerals, and different configurations and operations will be described.

  As shown in FIG. 3, the adsorption tower 1 </ b> A of the present embodiment is smaller in diameter than the adsorption tower body 3 directly above the lower end plate 6, and the lower screen 7 as a cylindrical filter portion is flat with the adsorption tower body 3. It is installed on the concentric circle. A mortar-shaped separator 25 serving as a separator extending obliquely upward toward the inner peripheral surface of the adsorption tower body 3 is provided from the end plate 12 a which is the upper edge of the lower screen 7.

  A plurality of support portions 19 are fixed to the bottom surface of the end plate 12 b of the lower screen 7, and these support portions 19 abut against the lower end plate 6 to support the lower screen 7.

  Therefore, the lower screen 7 of the present embodiment is arranged so that the end plate 12b is on the lower side and the end plate 12a is on the upper side. The upper screen 11 is also arranged in the same positional relationship.

  In the present embodiment, the inside of the lower screen 7 and the upper part of the separator 25 in the adsorption tower main body 3 form an adsorbent accommodating portion 15 in which the adsorbent 14 is accommodated. The outside of the lower screen 7 and the lower part of the separator 25 form a processing liquid storage portion 16 that stores the processing liquid that has been subjected to the adsorption treatment by the adsorbent 14. The lower screen 7 does not allow the adsorbent 14 to pass from the inside to the outside, but allows only the processing liquid adsorbed by the adsorbent 14 to pass from the inside to the outside.

  Therefore, the lower screen 7 and the separator 25 serve as an isolation part that isolates the adsorbent storage unit 15 that stores the adsorbent 14 and the processing liquid storage unit 16 that stores the processing liquid adsorbed by the adsorbent 14. It has a function. The lower screen 7 of the present embodiment is different from the upper screen 11 in that the inner peripheral side is the plane portion side of the inverted triangular cross section of the wedge wire 13.

  A tubular processing liquid outflow nozzle 18 extending in the vertical direction is installed in the adsorption tower body 3. The upper end portion of the processing liquid outflow nozzle 18 passes through the upper end plate 5 and the shielding lid 2a and extends outside the shielding container 2 (outside the shielding lid 2a). The processing liquid outflow nozzle 18 is provided with an outflow valve 18a. . The lower end portion of the processing liquid outflow nozzle 18 extends through the separator plate 25 to the processing liquid storage portion 16.

  As described above, according to the present embodiment, the cylindrical lower screen 7 is installed at the bottom of the adsorption tower main body 3, and the mortar-shaped separator 25 is connected to the upper portion, whereby the effect of the first embodiment is achieved. In addition, the processing liquid that has passed through the adsorbent 14 can be quickly collected in the processing liquid storage section 16 of the lower screen 7. Similarly, when the adsorbent 14 is discharged, it can be easily discharged.

(Third embodiment)
FIG. 4 is a cross-sectional view showing a third embodiment of the adsorption tower according to the present invention. FIG. 5 is an enlarged longitudinal sectional view showing the lower part of the adsorption tower body of FIG. The present embodiment is a modification of the second embodiment. The same or corresponding parts as those in the second embodiment are denoted by the same reference numerals, and different configurations and operations will be described. In FIG. 4, the illustration of the adsorbent 14 is omitted.

  As shown in FIGS. 4 and 5, a mortar-shaped separator 25 extending obliquely upward toward the inner peripheral surface of the adsorption tower body 3 is provided from the end plate 12 a which is the upper edge of the lower screen 7. Yes. In the adsorption tower 1 </ b> B of the present embodiment, ten upper strainers 27 are attached to the outer peripheral side of the separator plate 25 at regular intervals in the circumferential direction. Six lower strainers 28 are attached to the inner peripheral side of the separator plate 25 at regular intervals in the circumferential direction. In other words, the strainers 27 and 28 are arranged in a distributed manner on the outer peripheral side and the inner peripheral side of the separator plate 25, respectively.

  In the present embodiment, an example in which ten upper strainers 27 are attached to the outer peripheral side of the separator plate 25 and six lower strainers 28 are attached to the inner peripheral side of the separator plate 25 has been described. It is sufficient to attach the number according to the processing capability without being limited to the number.

  These strainers 27 and 28 have the same structure, and a wedge wire is provided between the upper and lower end plates as in the lower screen 7 and the upper screen 11. The wedge wire does not allow the adsorbent 14 to pass through, but allows the adsorbent 14 to adsorb the radioactive substance and pass only the processing liquid.

  In the adsorption tower main body 3, the inside of the lower screen 7, the upper part of the separator 25, and the outside of the strainers 27 and 28 form an adsorbent accommodating portion 15 in which the adsorbent 14 is accommodated. The outside of the lower screen 7, the bottom of the separator 25, and the inside of the strainers 27 and 28 form a processing liquid storage unit 16 that stores the processing liquid that has been subjected to the adsorption treatment by the adsorbent 14. The lower screen 7 and the strainers 27 and 28 do not allow the adsorbent 14 to pass through, but allow only the processing liquid adsorbed by the adsorbent 14 to pass therethrough. Therefore, the strainers 27 and 28 together with the lower screen 7 and the separator 25 constitute an isolation part.

  As described above, according to the present embodiment, in addition to the effects of the second embodiment, by providing a number of strainers 27 and 28 in addition to the lower screen 7, the treatment liquid adsorbed by the adsorbent 14 can be treated. Without staying in the adsorption tower main body 3, it becomes possible to flow into the processing liquid storage unit 16 more rapidly. In other words, it is possible to greatly reduce the pressure loss when the processing liquid flows into the processing liquid storage unit 16.

(Other embodiments)
Although the embodiment of the present invention has been described, this embodiment is presented as an example and is not intended to limit the scope of the invention. This embodiment can be implemented in various other forms, and various omissions, replacements, changes, and combinations can be made without departing from the spirit of the invention. This embodiment and its modifications are included in the scope of the present invention and the gist thereof, and are also included in the invention described in the claims and the equivalent scope thereof.

  In addition, although the said 2nd and 3rd embodiment demonstrated the example which formed the separator 25 as a separator in the mortar shape, you may form not only in this but in a horizontal partition plate. When formed in this way, in the third embodiment, it is only necessary to remove the lower screen 7 and install a number of strainers 27 and 28. However, since the weight of the adsorbent 14 and the liquid pressure of the contaminated liquid are directly applied to the horizontal partition plate, it is desirable that the horizontal partition plate be formed thick.

  DESCRIPTION OF SYMBOLS 1,1A, 1B ... Adsorption tower, 2 ... Shielding vessel, 2a ... Shielding lid, 3 ... Adsorption tower body, 4 ... Body, 5 ... Upper end panel, 6 ... Lower end plate, 7 ... Lower screen (isolation part, filter part) 11 ... Upper screen (filter part), 12a, 12b ... End plate, 13 ... Wedge wire, 14 ... Adsorbent, 15 ... Adsorbent storage part, 16 ... Treatment liquid storage part, 17 ... Contaminating liquid inflow nozzle, 17a Inflow valve, 18 ... Treatment liquid outflow nozzle, 18a ... Outflow valve, 20 ... Drain liquid outflow nozzle, 20a ... Outlet valve, 25 ... Separator (separation part), 27 ... Upper strainer (isolation part), 28 ... Lower strainer (Isolation part)

In order to solve the above problems, an adsorption tower according to the present embodiment adsorbs the radioactive substance from a contaminated liquid containing a radioactive substance with an adsorbent and discharges the treated liquid. a fence lid barrier closing the top opening of the shielding container, and the adsorption tower body housed in the shielding container, and the adsorbent housing part for housing the adsorbent in the adsorption tower body, the radioactive by the adsorbent The shielding container for isolating the treatment liquid containing the treatment liquid on which the substance has been subjected to the adsorption treatment, and allowing the treatment liquid to pass therethrough, and the upper end portion penetrates the upper part of the adsorption tower body and the shielding lid, and the shielding container. A contaminated liquid inflow nozzle that extends outside and flows the contaminated liquid into the adsorption tower main body, an upper end extends through the upper part of the adsorption tower main body and the shielding lid, and extends out of the shielding container, and a lower end is the Inside the adsorption tower body It extends serial processing liquid storage unit, and the processing liquid outlet nozzles for the outflow of the treatment liquid, extending in the shielded container outer top and through the shielding lid of the upper end the adsorption tower body, the adsorption tower lower end portion And a drain liquid outflow nozzle that extends to the deepest part of the processing liquid storage part of the main body and allows the drain liquid in the processing liquid storage part to flow out .

The treatment liquid discharge method for an adsorption tower according to the present embodiment is the method for adsorbing the radioactive substance from a contaminated liquid containing a radioactive substance with an adsorbent, and discharging the treatment liquid. A contaminated liquid inflow step for allowing the contaminated liquid to flow into an adsorption tower body housed in a shielding container, and passing the contaminated liquid through an adsorbent in the adsorption tower body to adsorb the radioactive substance. A process of causing the processing liquid to flow into the processing liquid storage section through an adsorption step for processing liquid, and an isolation section for isolating the adsorbent storage section for storing the adsorbent and the processing liquid storage section for storing the processing liquid. A liquid inflow step, a treatment liquid outflow step of flowing out of the adsorption tower main body from the treatment liquid storage section through the treatment liquid outflow nozzle, and an upper end portion of the upper portion of the adsorption tower main body and the upper end opening of the shielding container. Shielding lid A drain liquid outflow nozzle that extends through the shielding container and has a lower end extending to the deepest part of the processing liquid storage part of the adsorption tower main body allows the drain liquid in the processing liquid storage part to be discharged outside the adsorption tower main body. A drain liquid draining step for draining .

Claims (8)

In the adsorption tower for adsorbing the radioactive substance from the contaminated liquid containing the radioactive substance with an adsorbent and discharging the treated liquid,
A shielding container,
A shielding lid for closing the upper end opening of the shielding container;
An adsorption tower body housed in the shielding container;
The adsorbent storage unit for storing the adsorbent in the main body of the adsorption tower is isolated from the processing liquid storage unit for storing the processing liquid in which the radioactive substance is adsorbed by the adsorbent, and the processing liquid is allowed to pass therethrough. The isolation part,
An upper end of the adsorbing tower main body and the shielding lid penetrating the outside of the shielding container and penetrating the contaminated liquid into the adsorbing tower main body;
The upper end of the adsorption tower passes through the upper part of the adsorption tower main body and the shielding lid and extends out of the shielding container. The lower end of the adsorption tower extends into the treatment liquid storage part in the adsorption tower main body, and the treatment liquid flows out. A nozzle,
An adsorption tower comprising:   The upper end extends through the upper end plate and the shielding lid that closes the upper end opening of the adsorption tower body and extends out of the shielding container, and the lower end extends to the position directly above the lower end panel that closes the lower end opening of the adsorption tower body, The adsorption tower according to claim 1, further comprising a drain liquid outflow nozzle for allowing the drain liquid in the processing liquid storage unit to flow out.   The adsorption tower according to claim 2, wherein the isolation unit is a filter unit that is installed immediately above the lower end plate and allows the treatment liquid to pass therethrough.   The adsorption tower according to claim 3, wherein a mortar-shaped separator is connected to an upper edge of the filter part, and the separator constitutes the separator together with the filter part.   A plurality of strainers attached to the outer peripheral side and inner peripheral side of the separator plate at a predetermined interval in the circumferential direction are provided, and these strainers constitute the separator unit together with the filter unit and the separator plate. The adsorption tower according to claim 4.   The adsorption tower according to any one of claims 1 to 5, wherein the shielding container is integrally formed in a bottomed cylindrical shape. In the treatment liquid discharge method of the adsorption tower, wherein the radioactive substance is adsorbed from the contaminated liquid containing the radioactive substance by an adsorbent and the treatment liquid is discharged.
A contaminated liquid inflow step for allowing the contaminated liquid to flow from the contaminated liquid inflow nozzle into the adsorption tower body housed in the shielding container;
An adsorption step in which the contaminated liquid is passed through an adsorbent in the main body of the adsorption tower and the radioactive substance is adsorbed to form a treatment liquid;
A treatment liquid inflow step for allowing the treatment liquid to flow into the treatment liquid accommodation portion via an isolation portion that separates the adsorption material accommodation portion for accommodating the adsorption material and the treatment liquid accommodation portion for accommodating the treatment liquid;
A treatment liquid outflow step for flowing out of the main body of the adsorption tower from the treatment liquid container through a treatment liquid outflow nozzle;
A process liquid discharge method for an adsorption tower, comprising:   8. The method for discharging a processing liquid from an adsorption tower according to claim 7, further comprising a drain liquid outflow process for allowing the drain liquid in the processing liquid storage section to flow out by a drain liquid outflow nozzle after the processing liquid outflow process.

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