JP3923666B2 - Purification device for pool water in pressure suppression chamber and method for the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pressure suppression indoor pool water purification treatment apparatus for purifying high-concentration insoluble impurities or soluble impurities in pool water in a pressure suppression chamber installed in a nuclear reactor containment vessel, and It relates to the processing method.
[0002]
[Prior art]
Pool water is always stored in the pressure suppression chamber, which is responsible for the pressure control function in the containment vessel installed at the nuclear power plant, for vapor condensation when the coolant is lost. In addition, the interior of the pressure suppression chamber where the steel sheet is coated is in an underwater or humid environment, so it is in a very severe situation from the viewpoint of corrosion. To maintain the pressure suppression function of pool water and improve reliability It is necessary to repaint (repaint) the interior of the pressure suppression chamber.
[0003]
In order to perform this repainting work, not only draining all pool water, but also repainting work unless the radioactive insoluble matter adhering to and accumulating on the inside of the pressure suppression chamber is also removed. This may increase the radiation exposure dose of the person, increase the work load, and increase the time, which may naturally cause the pool repainting process to be extended.
[0004]
With reference to FIG. 5, a general pool water treatment procedure before the pool repainting operation in the pressure suppression chamber and the pressure suppression chamber that is conventionally performed will be described.
In FIG. 5, reference numeral 1 is a torus-like pressure suppression chamber, 2 is a header, 3 is a downcomer, and the pressure suppression chamber 1 is installed in a nuclear reactor containment vessel (not shown). Pool water 4 is stored in the chamber 1. For example, the vapor | steam discharge | released in a reactor containment vessel at the time of abnormality of a reactor is led to the pool water 4 through the downcomer 3 from the header 2, and is condensed, and the pressure rise in a reactor containment vessel is suppressed.
[0005]
When cleaning the inside of the pressure suppression chamber 1, the worker 5 assembles and enters the work platform 6, and cleans the surface of the downcomer 3 by using the suction jig 7 and the rotating brush 8. At the same time, the inner surface of the pressure suppression chamber 1 is cleaned by the underwater cleaner 9 and dust and the like are sucked by the suction jig 7. The rotating brush 8 is sprayed with water from a makeup water system (MUWC) pipe 10.
[0006]
A submersible pump 11 is installed in the pool water 4, and the discharge side of the submersible pump 11 is connected to the suction line 12. A plurality of (three in the figure) filters 14 are connected in parallel to the downstream side of the suction line 12 via a stop valve 13, and a desalter 15, a surge tank 16 and a filter tank are connected to the filtrate discharge side of the filter 14. The transfer pump 17 is connected sequentially.
[0007]
Stop valves 18 and 19 are temporarily connected to the discharge side of the transfer pump 17, and the downstream side of the stop valve 19 is connected to a storage tank 20 for transferring to a main pool water surge tank or a condensate storage tank. . A return line 21 having a stop valve 22 branched from the stop valves 18 and 19 is connected, and the open end of the return line 21 is immersed in the pool water 4.
[0008]
A suction pump 23 is connected to the discharge side of the submersible cleaner 9, and a discharge side of the suction pump 23 is connected to the suction line 12. The return line 21 and the makeup water system pipe 10 are connected to each other via a switching valve 24. A stop valve 25, a check valve 26, a high pressure pump 27, a stop valve 28 and a condensate surge tank 29 are sequentially connected in series to the makeup water system pipe 10.
[0009]
Pool water volume is 2000-3000m depending on the size of the reactor ^Three That is all. Temporary purification treatment facility using suction jig 7, suction pump 23, submersible pump 11, etc. to suck up insoluble impurities (cladding) deposited on the bottom wall of pressure suppression chamber 1 at the same time as pool water Purify the pool water.
[0010]
The structure of the temporary purification treatment equipment consists of a filter 14 incorporating a hollow fiber membrane module as a filter medium, a desalinator 15 filled with ion exchange resin, a surge tank 16 for confirming the water quality after purification, and purified water Is constituted by a transfer pump 17 for transferring the pool water 4 to the receiving destination.
[0011]
The pool water stock solution is filtered by passing through the hollow fiber membrane module in the filter 14, and the filtered insoluble impurity component clad (also referred to as sludge) is captured in the filter 14. The filtered water sent out from the filter 14 further passes through a desalter 15 to remove impurity ions in the water and is sent out to the surge tank 16. In the surge tank 16, after confirming whether the water quality standard for the existing equipment of the pool water 4 receiving destination is satisfied, if there is no problem, the water is transferred to the receiving destination by the transfer pump 17.
[0012]
FIG. 6 shows a piping system in which a desalter 15, a counter pressure unit 30, a suction line 12 for supplying pool water into the filter 14 and an air vent pipe 31 are connected to the filter 14 in FIG. 5. In FIG. 6, reference numerals 32 to 34 denote on-off valves. The counter pressure unit 30 is connected to the indoor air system (SA).
[0013]
The filter 14 is a hollow fiber membrane module built-in type filter in which the hollow fiber membrane module 35 is incorporated in the main body body 36 vertically via a partition plate 37. In FIG. 6, reference numeral 38 is an upper tube sheet, 39 is a lower tube sheet, 40 is a pool water inflow pipe, and 41 is a filtrate outflow pipe.
[0014]
7A is an enlarged side view showing the hollow fiber membrane module 35 in the filter 14 shown in FIG. 6, and FIG. 7B is a filtration principle of the hollow fiber membrane module 35 in FIG. 7A. FIG. 2 is a partially enlarged cross-sectional view of a hollow fiber membrane 42 for explaining the above, and a schematic cross-sectional view exaggerating only one hollow fiber membrane 42.
[0015]
That is, the hollow fiber membrane module 35 is obtained by bending a large number of elongated hollow fiber membranes 42 into a U shape and bundling them, and fixing both ends thereof with the fixing members 43. As shown on the left side of FIG. 7B, the hollow fiber membrane 42 has a large number of pores. Water is pressurized from the outer surface and flows in, and the clad stays on the outer surface and is filtered. The filtrate passes through the hollow fiber membrane from the inner surface as shown on the right side of FIG.
[0016]
Both ends of the hollow fiber membrane 42 are held on the upper tube plate 38 via fixing members 43. The pressure-suppressed indoor pool water stock solution is filtered on the surface of the hollow fiber membrane 42 and then flows out from the outlet of the secondary filter 14 through the inside of the hollow fiber membrane 42.
[0017]
The hollow fiber membrane 42 captures the clad which is an insoluble component contained in the stock solution, and the differential pressure of the hollow fiber membrane 42 is increased by the growth and consolidation of the clad layer captured as a filtration residue on the surface of the hollow fiber membrane 42. Since the flow rate of the undiluted solution increases (treatment time), the regeneration operation is necessary to remove the clad layer trapped on the surface of the hollow fiber membrane 42 in a timely manner. This regeneration operation has a structure in which the clad layer is peeled off by applying water pressure from the inside of the hollow fiber membrane 42 and the clad (cake) is accumulated at the bottom of the filter.
[0018]
[Problems to be solved by the invention]
The filter 14 used in the conventional pressure suppression indoor pool water purification system accumulates the clad, which is an insoluble component in the pool water 4, so that the surface of the filter becomes a high dose and the construction worker's exposure increases. May be incurred. For this reason, the filter is operated in a state where a lead shielding container dedicated to the filter is separately manufactured and stored in the shielding container.
[0019]
However, the filter 14 becomes a heavy waste material at a high dose rate, and in the past, the method for its disposal and disposal has not been determined. There is a problem that storage space in the nuclear power plant facility is insufficient.
[0020]
In addition, when the concentration of the clad contained in the pool water 4 is high, the conventional filter 14 grows and consolidates the clad layer trapped as a filtration residue, and the number of regenerations (frequency) increases, so that water filtration is performed. Since the proportion of time that can be processed decreases, there are problems such as a decrease in the processing capacity of the filter 14, an increase in the amount of regeneration operation work, and an extension of the construction process.
[0021]
In addition, for the primary system water of nuclear power plants, the TOC (total organic carbon content) concentration management value is set in the water quality standard and is managed. The conventional apparatus does not have a function capable of clearing the required purified water quality standard, and an urgent construction of a purification system that can guarantee the required water quality value is a problem.
[0022]
The present invention has been made to solve the above-described problems, and suppresses the growth of an insoluble impurity (cladding) layer on the surface of the hollow fiber membrane when filtering insoluble impurities (cladding) in pool water. By increasing the load and increasing the load, the water treatment operation rate can be improved and the number of regenerations can be reduced, shortening the process and reducing the load on workers. An object of the present invention is to provide a pressure treatment indoor pool water purification treatment apparatus and a treatment method thereof that can obtain good purification performance according to the value.
[0023]
[Means for Solving the Problems]
The invention of claim 1 includes a pressure suppression chamber installed in the reactor containment vessel, a suction line for sucking the pool water in the pressure suppression chamber, and the suction line. Capturing insoluble components in connected and aspirated pool water Backwash regenerative filter with built-in hollow fiber membrane module And the total organic carbon content component is removed from the filtered water sent out from the backwashing regenerative filter with a built-in hollow fiber membrane module. Activated carbon adsorption tower Then, impurity ions are removed from the filtered water sent from this activated carbon adsorption tower and from which all organic carbon content components have been removed. Deionizer filled with ion exchange resin, surge tank connected to the downstream side of the demineralizer, and branched from between the surge tank and the demineralizer and connected to the pressure suppression chamber If the water quality standard value including the total organic carbon concentration is not met, the treated water is returned to the pressure suppression chamber. And a return line.
[0024]
According to the invention of claim 1, in the case where the TOC (total organic carbon content) concentration control value is provided in the purified water quality standard of the pressure suppression indoor pool water, the backwash type hollow fiber installed in the conventional purification system Water quality can be further improved by adding an activated carbon adsorption tower to the membrane filter and desalter (ion exchange resin tower) purification equipment.
[0025]
According to a second aspect of the present invention, the hollow fiber membrane module has a water collecting tube at the center axis, a plurality of hollow fiber membranes are arranged outside the water collecting tube, and upper and lower ends are fixed by potting portions. It is characterized by being.
[0026]
According to the invention of claim 2, since the protective tube of the hollow fiber membrane module in the filter can be deleted, the amount of insoluble impurities formed on the surface of the hollow fiber membrane, that is, the amount of the clad (sludge) layer deposited is reduced. By increasing the water flow time (treatment time) of the pool water, the number of times of backwashing regeneration (frequency) of the hollow fiber membrane can be reduced.
[0027]
The invention of claim 3 is characterized in that an air vent mechanism capable of automatically air venting is provided at the top of the filter.
Conventionally, the air supplied to the primary side in the filter cannot pass through the hollow fiber membrane that has been hydrophilized, accumulates in the upper part of the filter, and an air layer is generated in the hollow fiber membrane. There is a disadvantage that the water treatment time of pool water is shortened by reducing the water filtration area of the hollow fiber membrane. In order to solve this drawback, according to the invention corresponding to claim 3, a mechanism capable of automatically venting air from the upper part (top) of the filter is provided to prevent the hollow fiber membrane filtration area from being reduced, By effectively using the filtration surface, it is possible to extend the flow time (treatment time) of the stock solution and reduce the number (frequency) of backwash regeneration of the hollow fiber membrane.
[0028]
The invention of claim 4 is characterized in that a nozzle for taking in and sending out pool water in the pressure suppression chamber and a nozzle for taking in and out insoluble impurities deposited in the pressure suppression chamber are integrated with the filter. And
[0029]
According to the invention of claim 4, the nozzle that feeds the pressure-suppressed indoor pool water to the filter and the backwashing of the hollow fiber membrane when an increase in the differential pressure of the hollow fiber membrane or an increase in the dose equivalent rate of the filter surface occurs. By sharing the nozzle for sending out insoluble impurities (cladding) from the filter by performing the regeneration operation, it is possible to reduce the number of structural members and filter manufacturing processes, and it is possible to obtain an economic advantage.
[0030]
Invention of Claim 5 is the pool water in the pressure suppression chamber installed in the reactor containment vessel. Insoluble component contained in Is filtered through a backwash regenerative filter with a built-in hollow fiber membrane module, and this filtrate is introduced into an activated carbon adsorption tower to determine the total organic carbon concentration. Remove After adjustment, pass through an ion exchange resin filled desalter. Removed impurity ions With purified water, When the water quality standard value including the total organic carbon concentration is not satisfied by the return line, the treated water is returned to the pressure suppression chamber, The sludge captured by the filter is transferred to a filter sludge storage tank, and the used resin of the demineralizer is transferred to a used resin tank.
[0031]
According to the invention of claim 5, air bubbles are supplied (bubbled) from the lower part of the hollow fiber membrane filter module while the pool water is being filtered by the filter which is the constituent device of claim 1 or intermittently. Then, the vibration of the hollow fiber membrane and the collision of bubbles are generated, and the insoluble impurity (cladding) layer captured on the surface of the hollow fiber membrane is broken and peeled off.
[0032]
Thereby, the differential pressure | voltage rise of a hollow fiber membrane can be suppressed. By combining this method with the invention of claim 2, it is possible to further extend the flow time (treatment time) of the stock solution and reduce the number (frequency) of backwash regeneration of the hollow fiber membrane.
[0033]
In the invention of claim 6, in the filtration treatment by the filter, air bubbles are continuously or intermittently supplied to the surface of the hollow fiber membrane, the filter cake formed on the surface of the hollow fiber membrane is peeled off, and the filtration treatment is performed. It is characterized by suppressing an increase in membrane differential pressure at the time.
[0034]
Furthermore, by providing a desalter filled with ion exchange resin on the downstream side of the backwash regenerative filter with a built-in hollow fiber membrane, it is possible to remove soluble impurity ions that cannot be removed even by filtration with a hollow fiber membrane. It is possible to obtain a good purified water quality.
[0035]
Also, in recent years, even when the TOC (total organic carbon content) concentration control value is set as the primary system water quality standard for nuclear power plants, the hollow fiber membrane and ion exchange are provided by providing an adsorption tower filled with activated carbon. The TOC component that could not be removed by the treatment can be removed, and the required purified water quality can be ensured.
[0036]
In the purification apparatus according to the present invention, the TOC component treatment order by the activated carbon adsorption tower is downstream of the backwash regenerative filter with a built-in hollow fiber membrane module and is performed before the ion exchange treatment. This is because there is a concern that the water quality deteriorates due to the alkali ion component eluted from the activated carbon during the initial water flow, so even if the ion component from the activated carbon is eluted, an alkali ion can be obtained by providing an ion exchange resin tower downstream of the activated carbon adsorption tower. Ingredients can be removed.
[0037]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of a pressure suppression indoor pool water purification apparatus and method according to the present invention will be described with reference to FIGS. 1 to 4.
FIG. 1 shows a treatment apparatus for purifying pool water 4 in a pressure suppression chamber 1 according to the present embodiment. The main components are a suction pump 23 for sucking and transferring the pool water 4 in the pressure suppression chamber 1, a backwash regenerative filter 44 incorporating a hollow fiber membrane filter module 35 as a filter medium, and activated carbon. Activated carbon adsorption tower 45, demineralizer 46 filled with ion exchange resin, surge tank 47 for confirming the quality of the purified water, transfer for transferring the purified water to the pool water 4 destination in the pressure suppression chamber 1 It is composed of a pump 48.
[0038]
The pool water 4 is filtered by passing through the hollow fiber membrane module 35 in the filter 44, and the clad, which is a filtered insoluble component, is captured in the filter 44. The filtered water delivered from the filter 44 is then passed through the activated carbon adsorption tower 45 to remove the TOC component, and finally passes through the desalter 46 to remove impurity ions in the water. Sent to 47.
[0039]
The purified water sent to the surge tank 47 is transferred by the transfer pump 48 after confirming that the existing equipment receiving water quality standard of the receiving destination of the pool water 4 in the pressure suppression chamber 1 is satisfied. Considering that the water quality standard value was not satisfied, a return line 7 is provided so that it can be circulated again. The clad (sludge) side of the filter 44 is connected to a filter sludge storage tank 82, and the used resin side of the desalter 46 is connected to a used resin storage tank 83.
[0040]
In FIG. 1, the pressure suppression chamber 1 is provided with a nozzle a for taking in and sending out pool water 4 and a nozzle b for taking in and sending out impurities deposited in the pressure suppression chamber 1. , B can be integrated.
[0041]
FIG. 2 shows a system configuration around the backwashing regenerative filter 44 with a built-in hollow fiber membrane module constituting the pool water purification treatment apparatus of the present embodiment.
It comprises a backwashing regenerative type filter 44 in which the hollow fiber membrane module 35 is incorporated in the body of the filter body as a filter medium, and a backwashing operation unit 49 and a desalter 46 which are auxiliary equipment for regeneration. The pool water 4 supplied from the inlet nozzle 50 is filtered by passing through the hollow fiber membrane module 35, and the filtered water is sent out from the outlet nozzle 51.
[0042]
In FIG. 2, reference numeral 52 denotes a bubbling air inlet nozzle that penetrates the side surface of the main body 36 of the filter 44, 53 a primary side vent nozzle, 54 an automatic air vent valve, and 55 a secondary side dome. The outlet nozzle 51, the bubbling air inlet nozzle 52, and the primary side vent nozzle 53 are connected to the backwash operation unit 49. The air source of the backwash operation unit 49 is supplied from the in-house air system (SA), and is supplied into the filter 44 through an air filter.
[0043]
FIG. 3 is a view showing a comparison between a hollow fiber membrane module in a conventional filter used in a condensate purification system or the like in a nuclear power plant and a hollow fiber membrane module in a filter 44 of the present invention.
[0044]
The module structure is the same, and about 1,000 to several tens of thousands of hollow fiber membranes 42 are fixed to the potting unit 60. After the stock solution is filtered on the surface of the hollow fiber membrane 42, the water collecting pipe 61 passes through the inside of the hollow fiber membranes. Or it has the structure which goes out to the secondary side directly from the end.
[0045]
The structural difference from the filter 44 of the present invention is that the protective tube of the hollow fiber membrane module is deleted. The filter hollow fiber membrane module of the power plant main equipment has been improved in durability with a protective tube since it has been repeatedly used for several years with water and backwash regeneration. However, the operation period of the filter 44 of the present invention is an operation for 12 days even at the maximum number of days, and it is not necessary to consider durability.
[0046]
By eliminating this protective tube, the amount of insoluble impurity (cladding) layer trapped on the surface of the hollow fiber membrane is increased, and the water flow time (treatment time) of the pool water is extended to increase the number of backwash regeneration times of the hollow fiber membrane. (Frequency) can be reduced. By the way, the insoluble matter loading per filtration area of the hollow fiber membrane module is ~ 100 g-SS / m ² Will be improved. Depending on operating conditions, up to 12g-SS / m for a conventional filter with a protective tube ² Degree.
[0047]
The backwash operation unit 49 has an outlet nozzle 51, a bubbling air inlet nozzle 52 and a primary side vent nozzle 53 through which the air from the indoor air system (SA) passes through the internal air line 56 and passes through the air filter 57 through the flow meter 58. Supplied to. In FIG. 2, reference numeral 59 denotes a check valve.
[0048]
Next, the operation of the present embodiment will be described with reference to FIG. When the pool water supplied from the inlet nozzle 50 to the filter 44 is filtered by the hollow fiber membrane module 35a, the backwash operation unit 49 is operated, and the bubbling air is filtered from the bubbling air inlet nozzle 52 by the filter 44. The hollow fiber membrane oscillates by being fed into the inside.
[0049]
When the water filtration treatment is performed in this state, the hollow fiber membrane surface 35a is formed by rocking the hollow fiber membrane module 35a with bubbling air and colliding bubbles with an insoluble impurity (cladding) layer on the membrane surface. The clad layer trapped on the surface can be suppressed, and an increase in the differential pressure of the hollow fiber membrane can be suppressed.
[0050]
The bubbling air is accumulated in the upper part of the primary side of the filter 44, but passes through the primary vent nozzle 53 of the filter 44 to separate only the air from the automatic air vent valve 54, and is outside the purification processing system of the present embodiment. To discharge. Thereby, the filtration surface of all the hollow fiber membrane modules 35a can be used effectively at the time of a filtration process.
[0051]
By transferring the clad (sludge) captured in the filter 44 to the sludge storage tank 82 with compressed air, the filter 44 can be transferred before the high dose rate is reached, eliminating the need for a shielding container and reducing radiation exposure. Can be reduced.
[0052]
When the differential pressure of the hollow fiber membrane rises due to trapping of insoluble impurities (cladding) in the pool water 4 in the pressure suppression chamber 1, the treated water in the secondary dome 55 is filtered by compressed air. It is pushed into the primary side of 44 and the clad layer captured on the surface of the hollow fiber membrane is peeled off (backwashing with water).
[0053]
Thereafter, the compressed air is pushed into the primary side from the bubbling air inlet nozzle 52, thereby transferring the pressure of the primary side backwash water to a sludge storage tank or the like of the existing waste treatment facility in the nuclear power plant.
[0054]
The backwashing water outlet at the time of this pressure transfer is performed by using the pool water stock solution inlet nozzle in common. By the above backwash regeneration operation, the differential pressure recovery of the hollow fiber membrane is achieved, and the water filtration process of the pool water stock solution in the pressure suppression chamber can be continued.
[0055]
3 (a) to 3 (d) are schematic cross-sectional views for explaining the filter used in the present invention in comparison with the conventional filter, and FIGS. 3 (a) and 3 (b) show the present embodiment. FIG. 3 (a) is a schematic longitudinal sectional view showing the structure of the backwash regenerative filter 44 used in the embodiment, and FIG. 2 is a longitudinal sectional view schematically showing a hollow fiber membrane module 35a in FIG. FIG. 3 (c) is a longitudinal sectional view showing a filter 14 using a conventional hollow fiber membrane module, and FIG. 3 (d) is a longitudinal sectional view schematically showing the hollow fiber membrane module in FIG. 3 (c). is there.
[0056]
Since the filter 44 used in the present invention is not provided with a module protection tube, the cost for processing the sleeve to the module mounting plate 60 can be reduced, and the material cost for the protection tube can also be reduced. The mounting method of the module 35a is a fixing method using a joint coupler, and the cladding load per module filtration area is ~ 100 g-SS / m. ² It is. In FIG. 3B, reference numeral 61 denotes a potting portion, and 62 denotes a water collecting pipe.
[0057]
On the other hand, since the conventional filter 14 uses the module protection tube 63, the module mounting plate 60 needs to be sleeved. The mounting method of the module 36 is based on the presser plate 64. The clad load per module filtration area is ~ 12g-SS / m ² It is.
[0058]
FIG. 4 is a longitudinal sectional view showing an example of the desalter 46 in FIG. As shown in FIG. 4, the desalter 46 has an upper lid 66 and a lower bottom plate 67 for closing the upper and lower ends of the main body cylinder 65, and an ion exchange resin 68 is loaded in the main body cylinder 65, and an ion exchange resin 68 is loaded in the lower part. A mesh-shaped inverted conical ion exchange resin holding portion 69 for holding the exchange resin 68 is provided. In FIG. 4, reference numeral 70 indicates a predetermined height of the ion exchange resin 68.
[0059]
An inlet nozzle 71 for inflowing raw water is attached to the upper lid 66, and a manual valve 72 is provided in the inlet nozzle 71. A dispersion plate 73 is provided on the inner surface of the upper lid 66 via a dispersion plate holder 74, and the dispersion plate holder 74 and the upper lid 66 are fixed by screws 75.
[0060]
An outflow nozzle holding plate 77 having a purified water outflow nozzle 76 through which the purified water passing through the ion exchange resin 68 and flowing out from the ion exchange resin holding portion 69 flows out of the main body cylinder 65 is provided in the lower part of the main body cylinder 65. It has been. The lower end opening of the purified water outflow nozzle 76 is connected to the outlet nozzle 78, the outlet nozzle 78 is led out through the main body body 65, and the purified water manual valve 79 is connected to the outlet nozzle 78.
[0061]
One end of a resin outlet nozzle 80 is connected to the lower end portion of the ion exchange resin holding plate 69, and the other end of the resin outlet nozzle 80 passes through the lower portion of the main body cylinder 65 and is connected to a used resin discharge valve 81. In the desalter 46 shown in FIG. 4, the raw water before treatment enters from the inlet nozzle 71 and passes through the ion exchange resin 68 layer in the main body cylinder 65 to remove impurity ions, and to the outlet nozzle 78. Sent out.
[0062]
Further, the used ion exchange resin is sent out from the resin outlet nozzle 80 by the pressure of compressed air and water from the inlet nozzle 71 as in the case of the filter. According to the desalinator of this Embodiment, the bottom part is formed in the reverse cone shape so that used resin may flow out easily.
[0063]
【The invention's effect】
According to the present invention, in the case of purification treatment of pool water containing a large amount of impurities such as a pressure suppression chamber, The water quality standards including the total organic carbon concentration can be adequately met. Because it is a system with purification performance that can sufficiently cope with strict requirements for purified water quality value conditions, it can ensure the water quality as expected.
[0064]
Moreover, since the filter can suppress the differential pressure | voltage rise of a hollow fiber membrane, it can extend stock solution water passing time (processing time) and can reduce the frequency | count (frequency) of backwash reproduction | regeneration of a hollow fiber membrane. As a result, the pool water purification treatment period can be shortened and the load on the worker can be reduced. In addition, the main equipment such as the filter, desalinator, and activated carbon adsorption tower can be reused after the construction is completed, and the amount of high-dose miscellaneous solid waste can be greatly reduced.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a system diagram for explaining a first embodiment of a pressure suppression indoor pool water purification apparatus and method according to the present invention.
FIG. 2 is a system diagram for explaining a second embodiment of the purification treatment apparatus for pressure suppression indoor pool water and the treatment method thereof according to the present invention.
3A is a schematic view showing a filter for use in the present invention, FIG. 3B is an enlarged view of a filter module in FIG. 3A, and FIG. 3C is a longitudinal sectional view showing a conventional filter; (D) is a longitudinal cross-sectional view which expands and shows the filter module in (c).
FIG. 4 is a longitudinal sectional view showing a demineralizer for use in the present invention.
FIG. 5 is a system diagram for explaining a conventional purification method for pressure suppression indoor pool water.
6 is a system diagram showing the filter in FIG. 5 and the surrounding piping system.
7A is a longitudinal sectional view showing a hollow fiber membrane module of the filter in FIG. 6, and FIG. 7B is a schematic diagram for explaining the principle of the hollow fiber membrane filter in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Pressure suppression chamber, 2 ... Header, 3 ... Downcomer, 4 ... Pool water, 5 ... Worker, 6 ... Work platform, 7 ... Suction jig, 8 ... Rotary brush, 9 ... Underwater cleaner, 10 ... Supply Water system piping, 11 ... Submersible pump, 12 ... Suction line, 13 ... Stop valve, 14 ... Filter, 15 ... Desalter, 16 ... Surge tank, 17 ... Transfer pump, 18, 19 ... Stop valve, 20 ... Storage tank , 21 ... Return line, 22 ... Stop valve, 23 ... Suction pump, 24 ... Switching valve, 25 ... Stop valve, 26 ... Check valve, 27 ... High pressure pump, 28 ... Stop valve, 29 ... Condensate surge tank, 30 DESCRIPTION OF SYMBOLS ... Reverse pressure unit, 31 ... Air vent piping, 32-34 ... Open / close valve, 35 ... Hollow fiber membrane module, 35a ... Hollow fiber membrane module of the present invention, 36 ... Main body trunk, 37 ... Partition plate, 38 ... Upper tube plate 39 ... Lower tube plate, 40 ... Pool water inflow pipe, 41 ... Filtrate outflow pipe, 42 ... Hollow fiber membrane, 43 ... Fixed member, 44 ... Backwash regenerative filtration with built-in hollow fiber membrane module 45 ... Activated carbon adsorption tower, 46 ... Desalter, 47 ... Surge tank, 48 ... Transfer pump, 49 ... Backwash operation unit, 50 ... Inlet nozzle, 51 ... Outlet nozzle, 52 ... Air inlet nozzle for bubbling, 53 ... Primary vent nozzle, 54 ... Automatic air vent valve, 55 ... Secondary dome, 56 ... In-house air line, 57 ... Air filter, 58 ... Flow meter, 59 ... Check valve, 60 ... Module mounting plate, 61 ... Potting part, 62 ... Catchment pipe, 63 ... Module protection pipe, 64 ... Presser plate, 65 ... Body body, 66 ... Upper lid, 67 ... Lower bottom plate, 68 ... Ion exchange resin, 69 ... Ion exchange resin holding part, 70 ... Predetermined height, 71 ... Inlet nozzle, 72 ... Manual valve, 73 ... Dispersion plate, 74 ... Dispersion plate holder, 75 ... Screw, 76 ... Purified water outflow nozzle, 77 ... Outflow nozzle holding plate, 78 ... Outlet nozzle, 79 ... Manual valve for purified water, 80 ... resin outlet nozzle, 81 ... used resin discharge valve, 82 ... filter sludge storage tank , 83 ... Used resin storage tank.

Claims (6)

Pressure suppression chamber installed in the reactor containment vessel, a suction line that sucks the pool water in the pressure suppression chamber, and a hollow fiber membrane that is connected to the suction line and captures insoluble components contained in the sucked pool water The module built-in backwash regenerative filter, the activated carbon adsorption tower that removes the total organic carbon content from the filtered water sent out from the hollow fiber membrane module built-in backwash regenerative filter, and the activated carbon adsorbed tower An ion-exchange resin-filled demineralizer that removes impurity ions from the filtered water from which organic carbon content has been removed, a surge tank connected to the downstream side of the demineralizer, and between the surge tank and the demineralizer pressure, characterized by comprising a return line for returning the treated water to the pressure suppression chamber when did not meet the water quality standard values including total organic carbon concentration is connected to the pressure suppression chamber branching from Purification processing apparatus suppressing indoor pool water.   The hollow fiber membrane module has a water collecting pipe on a central axis, a plurality of hollow fiber membranes are arranged outside the water collecting pipe, and upper and lower ends thereof are fixed by potting parts. Item 2. The pressure suppression indoor pool water purification apparatus according to Item 1. 3. The apparatus for purifying pressure suppression indoor pool water according to claim 1, wherein an air vent mechanism capable of automatically venting air is provided at the top of the filter. To the hemofilter, claims 1 to 3, characterized by being integrated with a nozzle for delivering incorporate insoluble impurities deposited a nozzle for delivering incorporate pool water in the pressure suppression chamber in the pressure suppression chamber The pressure suppression indoor pool water purification treatment apparatus described. The insoluble component contained in the pool water of the installed pressure suppression chamber reactor containment vessel, filtered through a hollow fiber membrane module built backwashing regenerative filter, flows the filtrate to activated carbon adsorption tower After removing and adjusting the total organic carbon concentration , purified water is passed through an ion exchange resin-filled demineralizer to remove impurity ions, and the return line does not meet the water quality standard value including the total organic carbon concentration. In this case, the treated water is returned to the pressure suppression chamber, the sludge captured by the filter is transferred to the filter sludge storage tank, and the used resin of the desalter is transferred to the used resin tank. How to treat pool water.   During filtration operation of the filter, air bubbles are supplied to the hollow fiber membrane surface of the hollow fiber membrane module continuously or intermittently, and sludge trapped on the hollow fiber membrane surface is peeled off, and the membrane at the time of filtration treatment 6. The method for treating pressure-controlled indoor pool water according to claim 5, wherein an increase in the differential pressure is suppressed.

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