JP2020030129A - Decontamination cartridge vessel of radioactive contaminated water, absorbent bag for decontamination cartridge vessel, decontamination device, rainwater piping and decontamination method - Google Patents

Abstract

To provide a decontamination device of radioactive contaminated water for preventing the lowering of a drainage function caused by the clogging of an absorbent part, and capable of coping with a large variation of a rainfall amount, being a device for decontaminating a contaminated waste liquid flowing into a drainage groove from a roof floor of a building via rainwater piping.SOLUTION: A decontamination cartridge vessel 5 being a bottomed bag-shaped body has: a side face 5a formed by laminating at least two kinds of impermeable filter cloths; a bottom face 5b formed of a permeable filter cloth; an attachment part 5c formed of the filter cloth covered with rubber having a vertical portion 5c1 woven to an upstream-side end part of the side face 5a, and a horizontal portion 5c2 extending so as to be sandwiched between two pieces of gaskets attached to rainwater piping when attaching the cartridge vessel 5 to the rainwater piping; a suspension belt 5d which is woven so as to extend up to a downstream-side end part from the upstream-side end part of the side face at least at a part of the side face; and a suspension ring 5e woven to the suspension belt, and detachably suspended to the gaskets.SELECTED DRAWING: Figure 5

Description

  The present invention relates to an apparatus and a method for decontaminating radioactive material dissolved in wastewater from precipitation and snowfall on a building roof contaminated with radioactive material, and particularly, while contaminated wastewater flows into the drainage ditch from the building roof by gravity. The present invention relates to an apparatus and a method for decontaminating radioactive contaminated water, in which a rainwater pipe is provided with a radioactive substance adsorbent filling section to prevent radioactive substances from leaking outside through a drain.

  Due to the accident that occurred at the Fukushima Daiichi Nuclear Power Station, a large amount of radioactive waste liquid containing radioactive cesium and radioactive strontium has been generated. This radioactive waste liquid contains contaminated water generated by cooling the reactor pressure vessel, containment vessel, and spent fuel pool, water trapped in the trench, and sub-drain around the reactor building. There are sub-drain water, groundwater, seawater, etc. pumped from wells called "radioactive effluents". These radioactive waste liquids are subjected to removal of radioactive substances in a treatment facility called Sally or Alps, and the treated water is collected in a tank.

  Among radioactive substances, as a substance capable of selectively adsorbing and removing radioactive cesium and radioactive strontium, ferrocyanide compounds such as navy blue, mordenite which is a kind of natural zeolite, synthetic type A zeolite, synthetic type X zeolite, aluminosilicate Salt, crystalline silicotitanate called CST, and the like. For example, in a cesium treatment apparatus called Sally, an aluminosilicate IE96 manufactured by UOP and a CST IE911 manufactured by UOP are used to remove radioactive cesium. In a multi-nuclide removal apparatus called Alps, titanium is used. An adsorbent which is an acid salt is used to remove radioactive strontium.

  On the other hand, the rainwater that falls in the Fukushima Daiichi Nuclear Power Plant contains radioactive substances such as radioactive cesium and radioactive strontium. In order to prevent these radioactive substances from directly flowing into port water, measures have been taken to install a sheet-shaped zeolite sheet in a drain ditch against rainwater flowing into a drain (Non-Patent Document 1).

  Sally and Alps pump up contaminated water stored in tanks and contaminated water in buildings, and remove radioactive materials by passing the contaminated water through an adsorption tower filled with a predetermined size of adsorbent. are doing. Since this treatment method uses a fixed adsorption tower, it is effective for treating contaminated water that is stored or retained, but it is derived from rainwater that is unspecifiedly generated at the Fukushima Daiichi NPS due to snowfall. Unsuitable for treating contaminated water.

  At the Fukushima Daiichi Nuclear Power Station, we installed a weir on the premises to prevent leakage of contaminated water from rainwater into the environment, prevent leakage, and remove radioactive materials from rainwater-contaminated water with a water treatment device using an RO membrane. Various measures have been taken, but no measures have been taken against rainwater falling on the roof of the building. It is also conceivable to install equipment to treat rainwater, but since the amount of precipitation varies greatly from zero in fine weather to several tens of mm / h called guerrilla downpour, it is necessary to provide equipment to cope with this. Is uneconomical.

  For this reason, radioactive materials contained in rainwater falling on the building roof are quickly removed without installing new large-scale equipment, and radioactive materials are leaked to the environmental system outside the Fukushima Daiichi Nuclear Power Station There is a need for a processing device that does not allow this.

Although it is used for general households, there has been proposed a collection and removal tool that detachably attaches a radioactive material adsorbent to a rain gutter to collect radioactive materials in washing drainage from the roof and rainwater (Patent Documents 1 to 3). 3).

  Drainage in rainwater pipes, unlike ordinary water pipes such as water pipes, does not flow in a full state, but in many cases flows in a mixture of two phases of gas and liquid. At the time of light rain, since the water is drained along the inner wall of the rainwater pipe, the adsorbent portion at the center of the rainwater pipe cannot contribute to the removal of radioactive substances. On the other hand, at the time of heavy rain, gas-liquid is drained in a turbulent state, so that the adsorbent portion through which the gas passes cannot contribute to the removal of radioactive substances. For this reason, in order to efficiently remove radioactive substances, it is necessary to rectify the wastewater before flowing into the adsorbent section in order to disperse and contact the wastewater throughout the adsorbent section.

  In addition, wastewater in rainwater pipes contains dust and defoliation in addition to radioactive substances. For this reason, when the wastewater passes through the adsorbent portion, dust and fallen leaves are trapped, the adsorbent portion is clogged, the drainage is not performed smoothly, and the original drainage function may be impaired. For this reason, it is necessary to have a structure in which the adsorbent portion does not cause clogging, or a structure in which the drainage function is not impaired even if the adsorbent portion is clogged, or can be detected promptly.

Utility Model Registration No. 3177123 Utility Model Registration No. 3175097 Utility model registration No. 3189912

TEPCO Press Release, November 21, 2016 (36th) [Appendix 2] Decommissioning and Contaminated Water Countermeasures Local Coordination Meeting Progress management table for recent issues, P98 On-site drainage channel progress status http: // www .tepco.co.jp / decommision / planaction / roadmap / index-j.html

  The adsorbent part provided in the middle of the rainwater pipe is replaced in a state where the adsorbent in the upper part where the contaminated water flows down breaks down first and the adsorption performance is reduced, and the adsorbent in the lower part is not used. The entire amount of the agent cannot be used effectively. If the lower-layer adsorbent is continuously used until it can be used, the upper-layer adsorbent has broken through and cannot adsorb radioactive substances, resulting in a high radiation dose. Also, if the volume of the adsorbent part is reduced, it cannot cope with heavy rain. Further, when the container for filling the adsorbent is made of metal, the exchange of the adsorbent portion generates radioactive waste.

  An object of the present invention is an apparatus for decontaminating contaminated waste liquid flowing from a building rooftop to a drainage channel via a rainwater pipe, which prevents a decrease in drainage function due to clogging of an adsorbent section and has a large rainfall amount. An object of the present invention is to provide an apparatus for decontaminating radiation contaminated water that can cope with fluctuations.

  Further, an object of the present invention is to provide a decontamination apparatus for radiation-contaminated water, in which the replacement operation of the adsorbent section is completed simply and in a short time, and the volume of radioactive waste generated by the replacement of the adsorbent section can be reduced. Is to do.

According to the present invention, when decontaminating contaminated waste liquid flowing from a building rooftop to a drainage channel via rainwater pipes, it is possible to prevent a decrease in drainage function due to clogging of an adsorbent portion, and to prevent a large fluctuation in rainfall. The present invention provides a technique for decontaminating radiation-contaminated water in which the replacement operation of the adsorbent section can be completed simply and in a short time, and the volume of radioactive waste generated by replacing the adsorbent section can be reduced. Specific aspects are as follows.
[1]

  ADVANTAGE OF THE INVENTION According to the decontamination cartridge container and decontamination apparatus of radioactive contaminated water of the present invention, without requiring a large-scale decontamination equipment, it is possible to prevent the drainage function from being reduced due to clogging of the adsorbent portion, and to reduce the amount of rainfall. It can cope with fluctuations and can decontaminate polluted waste liquid flowing from the rooftop of the building to the drain via rainwater piping.

  Also, according to the decontamination cartridge container and the radioactive contaminated water decontamination apparatus of the present invention, the replacement operation of the adsorbent portion is completed in a short time in a simple manner, and the radioactive waste generated by replacing the adsorbent portion is reduced. Can be tolerated.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall explanatory view of an embodiment in which the present invention is applied to a rainwater pipe for flowing drainage from a general building roof. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall explanatory view of an embodiment in which the present invention is applied to rainwater piping for flowing drainage from a building roof in a nuclear power generation facility. FIG. 3 is an exploded perspective view of a decontamination cartridge container detachably provided in the decontamination apparatus. The perspective view of the cartridge container for decontamination. FIG. 4 is a partially enlarged cross-sectional view showing a state in which filter cloths are stacked on a side surface of a decontamination cartridge container. The perspective view of the adsorbent bag detachably attached to the cartridge container for decontamination. The schematic diagram which shows a mode that radionuclide is adsorbed by the cartridge container for decontamination at the time of use with time. The top view showing one embodiment of the decontamination device of the present invention. FIG. 9 is a sectional view taken along line A-A ′ of FIG. 8. The top view which shows another embodiment of the decontamination apparatus of this invention. FIG. 11 is a sectional view taken along line A-A ′ of FIG. 10. BRIEF DESCRIPTION OF THE DRAWINGS The schematic explanatory drawing which shows the example 1 of a structure of the rainwater piping which incorporated the decontamination apparatus of this invention. The arrow A view of FIG. The schematic explanatory drawing which shows the example 2 of a structure of the rainwater piping incorporating the decontamination apparatus of this invention. The schematic explanatory drawing which shows the example 3 of a structure of the rainwater piping which incorporated the decontamination apparatus of this invention. FIG. 16 is a view taken in the direction of arrow A in FIG. 15. FIG. 16 is a view taken in the direction of arrow B in FIG. 15.

The present invention will be specifically described with reference to the accompanying drawings, but the present invention is not limited thereto.
FIG. 1 is an overall explanatory view of an embodiment in which the present invention is applied to a rainwater pipe for flowing drainage from a roof of a general house. FIG. 2 is a rainwater pipe for flowing drainage from a building roof in a nuclear power plant. 1 is an overall explanatory diagram of an embodiment to which the present invention is applied. In the case of a general house, drainage from the roof 1 is collected directly into the rainwater pipe 2, dropped by gravity, and introduced into the rainwater discharge channel 4. In a nuclear power generation facility, rainwater collecting portions 16 are provided at a plurality of locations on a flat building roof 11, and piping from the collecting portion 16 and rainwater piping 2 are provided in the building interior, and water collecting provided in the basement of the building is provided. Water is drained from the basin 15 to the outside. In any case, the decontamination apparatus 3 of the present invention is provided in the middle of the rainwater pipe 2 in order to decontaminate the wastewater from the roof 1 or 11 before the wastewater is discharged outside.

[Decontamination cartridge container]
3 is an exploded perspective view of a decontamination cartridge container 5 detachably provided in the decontamination apparatus 3, FIG. 4 is a perspective view of the decontamination cartridge container 5, and FIG. FIG. 6 is a perspective view of an adsorbent bag removably attached to the cartridge container 5 for decontamination, showing a laminated state of the cloth.

  The decontamination cartridge container 5 is configured as a bottomed bag. The side surface 5a of the bag-like body is formed by laminating at least two types of water-blocking filter cloths. The bottom surface 5b of the bag-like body is formed of a water-permeable filter cloth. At the upper end portion of the bag-like body, a mounting portion 5c formed of a filter cloth covered with rubber is formed. The mounting portion 5c extends so as to be sandwiched between the vertical portion 5c1 sewn to the upper end portion of the side surface 5a and the two gaskets mounted on the rainwater piping when the cartridge container is mounted on the rainwater piping. It has a horizontal portion 5c2. At least a part of the side surface 5a of the bag-like body is sewn to the hanging band 5d sewn so as to extend from the upper end to the lower end of the side surface, and is detachably attached to the gasket. A suspension ring 5e for suspension is formed. The hanging ring 5e allows the cartridge container 5 for decontamination to be easily attached and detached.

  An adsorbent for adsorbing radionuclides is filled in the lower inside of the bag-shaped body of the decontamination cartridge container 5, and a first adsorbent filling section 6 is provided. Above the first adsorbent filling section 6, a second adsorbent filling section 7 is detachably positioned. In the second adsorbent filling section 7, a bag-like body having a side surface 7a made of a water-blocking filter cloth and a bottom surface 7b made of a water-permeable filter cloth is filled with an adsorbent for adsorbing radionuclides. Above the second adsorbent filling section 7, a holding section 7c used for detaching the second adsorbent filling section 7 of the bag-like body is attached.

[Adsorbent bag]
The first and second adsorbent filling sections 6 and 7 are formed of adsorbent bags filled with an adsorbent capable of adsorbing radionuclides. FIG. 6 shows a perspective view of the adsorbent bag. For ease of explanation, a case where the second adsorbent filling section 7 in FIG. 3 is constituted by an adsorbent bag will be described as an example.

  The adsorbent bag 7 includes a body 7a made of a water-permeable or water-permeable filter cloth, a bottom 7b made of a water-permeable filter cloth, and a space 7d for positioning an adsorbent defined by the body 7a and the bottom 7c. An annular reinforcing portion 7e sewn around the entire upper end of the trunk 7a, and a suspension band 7c sewn to the trunk 7a so as to extend beyond the upper end of the trunk 7a. Have.

  Two suspension bands 7c may be sewn to the opposite surfaces of the body 7a, respectively, or one suspension band 7c may be sewn from one surface of the body 7a to the other opposite surface across the bottom 7b. It may be extended and sewn so as to form two suspension bands beyond the upper end of the trunk 7a. The two extending portions of the hanging band 7c can be used as the gripping portions 7c when they are attached to the decontamination cartridge container 6 by fisting or the like.

  The two adsorbent bags having the same configuration can be used as the first adsorbent filling section 6 and the second adsorbent filling section 7. Alternatively, when the adsorbent of the first adsorbent filling section 6 is larger in size than the adsorbent of the second adsorbent filling section 7, it is preferable that the body 7a be formed of a water-permeable filter cloth. .

[Replacement of adsorbent filling bag]
FIG. 7 is a schematic diagram showing the manner in which a radionuclide is adsorbed to a decontamination cartridge container during use over time. FIG. 7A shows a state where a new decontamination cartridge container is attached. FIG. 7 (b) shows that the contaminated water flows into the cartridge container for decontamination, the entire second adsorbent filling section (adsorbent bag) adsorbs the radionuclide, and the first adsorbent filling section (adsorbent bag). The upper part of () shows the state where the radionuclide is adsorbed. FIG. 7C shows a state in which only the second adsorbent filling section (adsorbent bag) is removed and the first adsorbent filling section (adsorbent bag) is left in the decontamination cartridge container. . FIG. 7D shows a state where a new second adsorbent filling section (adsorbent bag) is attached. FIG. 7 (e) shows that the radioactive contaminated water flows in, the entire second adsorbent filling section (adsorbent bag) adsorbs radioactive nuclides, and the center of the first adsorbent filling section (adsorbent bag). This shows a state where radionuclides are adsorbed to the vicinity. The decontamination cartridge container of the present invention is configured so that the second adsorbent filling section (adsorbent bag) is separately and detachably mounted on the first adsorbent filling section (adsorbent bag). As a result, the second adsorbent filling section (adsorbent) having a reduced ability to adsorb radionuclides without replacing the first adsorbent filling section (adsorbent bag) having the ability to adsorb radionuclides remains Only) can be replaced. Thereby, waste of the adsorbent can be avoided, and effective utilization of the adsorbent can be achieved.

  The cartridge container for decontamination of the present invention is not a metal or molded plastic container, but is formed by laminating flexible filter cloths. The bottom surface of the cartridge container for decontamination is formed of a water-permeable filter cloth, and allows radioactive contaminated water to flow therethrough. The side surface of the cartridge container for decontamination is formed by laminating and sewn at least two types of filter cloths to provide water-tightness. The water permeability of the filter cloth can be adjusted by appropriately selecting the material and the pore size. For example, one filter cloth having an aperture of 1 mm is used for the bottom surface, and a tough filter cloth and a water-blocking filter cloth are used for the side surfaces. In the illustrated embodiment, the side surface has a three-layer structure in which a polypropylene filter cloth, a polyurethane-coated nylon filter cloth, and a polypropylene filter cloth are laminated in this order in order to ensure toughness and water barrier properties. However, the material of the filter cloth used for the cartridge container for decontamination is not limited to these, and it is tough enough to withstand the water pressure of radioactive contaminated water in rainy weather, water shielding that can store radioactive contaminated water for a predetermined time, and after use. Any material having flexibility that can be folded at the time of replacement can be used without limitation. The attachment part of the cartridge container for decontamination uses, for example, a rubber-coated filter cloth in which neoprene rubber is coated on a filter cloth in order to be liquid-tight when used by being sandwiched between gaskets. It is preferable to use a high-strength filter cloth such as polyvinylidene dichloride for the mounting portion and the bottom surface of the decontamination cartridge container so as to withstand the load caused by the adsorbent and the pressure caused by the inflow of radioactive contaminated water. Since the cartridge container for decontamination of the present invention has a water-impervious side surface and a water-pervious bottom surface, when a large amount of radioactive contaminated water flows in, radioactive contaminated water stagnates from the water-impervious side surface and the water-pervious bottom surface. However, when a small amount of radioactive contaminated water flows in, the water-shielding side surface allows the radioactive contaminated water to sufficiently contact the adsorbent without leaking to the surroundings.

The adsorbent to be filled in the cartridge container for decontamination can be appropriately selected according to the radionuclide to be decontaminated.
[Decontamination equipment]
As shown in FIG. 3, the decontamination cartridge container of the present invention is detachably inserted into a tubular member 8 forming a part of a rainwater pipe to form a decontamination apparatus 3.

  As a mode of attaching the tubular member 8 to the rainwater pipe, a general joining method of tubular members can be used. For example, the flange of the rainwater pipe and the flanges at both ends of the tubular member 8 can be fastened using bolts, nuts and clamps.

FIGS. 8 and 9 show a decontamination apparatus for decontaminating radioactive contaminated water from the rainwater pipe 2 by diverting it into a plurality of cartridge containers provided in parallel. A plurality of combinations of the cartridge container 52, the tubular member 82, and the flange are provided, and a horizontal pipe 23a provided between each tubular member 82 and the rainwater pipe 2; A branch pipe 24a for diverting contaminated water, a connecting part 22a provided between each branch pipe 24a and each tubular member 82, and a flange connecting part for attaching each tubular member 82 to each connecting part 22a in a fluid-tight state 62a. In the present embodiment, a plurality of decontamination cartridge containers 52 are provided in parallel between the upper part 2a and the lower part 2b of the rainwater pipe. The cross-sectional area of each tubular member 82, that is, the cartridge container 52 for decontamination is shown to be wider than the cross-sectional area of the rainwater pipes 2a and 2b, but may be the same as the cross-sectional area of the rainwater pipe. The connecting portions 22a and 22b between the upper and lower ends of each tubular member 82 and each of the branch pipes 24a and 24b are cylindrical tubes having the same cross-sectional area as each tubular member 82, but have an inverted funnel shape and a funnel shape. Is also good. Further, the flange connection portions 62a and 62b may be bolt-nut-fastened or clamp-fastened.

  According to the present embodiment, the flow rate of the radioactive contaminated water passing through each of the decontamination cartridge containers 52 is reduced because the drainage from the rainwater pipe is diverted to each of the tubular members 82, that is, the decontamination cartridge containers 52. The contact time between water and the adsorbent becomes longer, and the decontamination effect is improved. In addition, the capacity of the decontamination device for holding drainage is increased, and decontamination during heavy rainfall is possible.

  FIGS. 10 and 11 show a decontamination apparatus for decontaminating radioactive contaminated water from the rainwater pipe 2 by diverting the contaminated water to a plurality of annularly provided adsorbents. A plurality of decontamination cartridge containers 53, a tubular member 83 surrounding each decontamination cartridge container 53, and four four members provided between the upper end of each tubular member 83 and the upper part 2a of the rainwater pipe 2. Radioactive contamination of each tubular member 83 from the horizontal pipe 231a, the inner annular pipe 232a and the outer annular pipe 233a connected to the four horizontal pipes 231a, and the inner annular pipe 232a and the outer annular pipe 233a. A branch pipe 241a that divides water, a connection part 221a provided between each branch pipe 241a and an upper end of each tubular member 83, and an upper end of each tubular member 83 is airtightly and watertightly connected to each connection part 221a. Flange connection part 63a to be attached, four horizontal pipes 231b provided between the lower end of each tubular member 83 and lower part 2b of rainwater pipe 2, and connection with four horizontal pipes 231b The inner annular pipe 232b and the outer annular pipe 233b, the branch pipe 241b for diverting radioactive contaminated water from the lower end of each tubular member 83 to the inner annular pipe 232b and the outer annular pipe 233b, and each branch pipe 241b. And a connecting portion 221b provided between the lower end of each tubular member 83 and a flange connecting portion 63b for attaching the lower end of each tubular member 83 to each connecting portion 221b in an airtight and watertight manner. In the present embodiment, a plurality of decontamination cartridge containers 53 are provided in an annular shape between the upper part 2a and the lower part 2b of the rainwater pipe. The cross-sectional area of each tubular member 83, that is, the cartridge container 53 for decontamination is shown to be wider than the cross-sectional area of the rainwater pipes 2a and 2b, but may be the same as the cross-sectional area of the rainwater pipe. The connecting portions 221a and 221b between the upper and lower ends of each tubular member 83 and the branch pipes 241a and 241b are cylindrical tubes having the same cross-sectional area as each tubular member 83, but have an inverted funnel shape and a funnel shape. Is also good. Further, the flange connection portions 63a and 63b may be fastened by bolts and nuts or fastened by clamps. The number of annular pipes is not limited, and one or more arbitrary numbers can be provided. The number of the tubular members 83 may be two or more at any position in the annular shape, and the number is not limited.

  According to this embodiment, since the radioactive contaminated water from the rainwater pipe is annularly diverted to each tubular member 83, that is, the cartridge container 53 for decontamination, the flow rate of the radioactive contaminated water passing through each cartridge container 53 is extremely low. As a result, the contact time between the radioactive contaminated water and the adsorbent 3a becomes longer, and the decontamination effect is improved. Further, the drainage holding capacity of the decontamination device becomes very large, and decontamination during heavy rainfall is possible.

[Rainwater piping]
12 and 13 show a configuration example 1 of the entire rainwater pipe incorporating the decontamination apparatus of the present invention. FIG. 13 is a view on arrow A in FIG.

The rainwater pipe 2 is provided with a decontamination device 3 on the way from the roof shown in FIG. 1 to the rainwater drainage channel 4 or the rooftop of the building shown in FIG. In the embodiment shown in FIG. 12, the rainwater pipe 2 extends vertically from the roof or the roof toward the ground, and is bent horizontally in the middle thereof, and the solid-liquid separation device 102, the decontamination device 103, and the water sealing tube A first flow path 100 is provided and extends again in the vertical direction. The second flow path 101 is an overflow line for flowing overflow water from the first flow path 100. An on-off valve 105 is provided near the water seal tube 104 in the first flow path 100.
Is provided so that the inside of the first flow path 100 can be drained during maintenance of the decontamination apparatus 103. The decontamination device 103 may have any of the above-described configurations. In the first channel 100, the solid-liquid separation device 102 removes solids such as dust before the radioactive contaminated water is introduced into the decontamination device 103 so that the adsorption performance of the adsorbent in the decontamination device 103 is not hindered. There is no particular limitation as long as it can be removed, and a general strainer or the like can be preferably used. A water seal tube 104 is provided downstream of the decontamination device 103, and the adsorbent of the decontamination device 103 is always immersed in water. In the present embodiment, the water seal tube 104 is of a siphon type. On the other hand, the second flow path 101 is a bypass path that causes the overflow from the first flow path 100 to flow down when the amount of precipitation increases in a short time such as a guerrilla downpour. Therefore, even if the precipitation is small, the wastewater can stay in the decontamination equipment. It is possible to prevent rainwater from overflowing.

FIG. 14 shows a configuration example 2 of the entire rainwater pipe incorporating the decontamination apparatus of the present invention.
The configuration example 2 shown in FIG. 14 is different from the configuration example 1 shown in FIGS. 12 and 13 in that the first flow path 100 extends vertically from the roof or the roof toward the ground instead of the second flow path 101 which is the bypass line. 12 and 13 except that a pressure valve 106 is provided in the middle. In the embodiment shown in FIG. 14, when the rainfall increases in a short time such as a guerrilla rainstorm, the pressure valve 105 is opened and the solid-liquid separation device 102, the decontamination device 103, and the water sealing tube 104 are passed. In addition to the flow path, a flow path that allows the first flow path 100 to flow down is also formed.

15 to 17 show a configuration example 3 of the entire rainwater pipe incorporating the decontamination apparatus of the present invention. 16 is a view as viewed from the direction of the arrow A in FIG. 15, and FIG. 17 is a view as viewed from the direction of the arrow B in FIG.
In the configuration example 3 shown in FIG. 15, a plurality of decontamination devices 103 are installed in parallel, and a branch pipe 113a for introducing radioactive contaminated water into the decontamination device 103 is connected to the solid-liquid separation device 102 and the plurality of decontamination devices 103. , A merging pipe 113b for receiving treated water from the plurality of decontamination devices 103 is provided, and the decontamination device 103 is disposed above an inlet 114a for introducing radioactive contaminated water into the decontamination device 103. 12 except that a water seal tube 114 configured to connect an outlet 114b for discharging treated water from the first flow path 100 to the first flow path 100 is provided instead of the water seal tube 104 shown in FIG. This is the same configuration as the configuration example 1 shown in FIG. When a plurality of decontamination devices 103 are installed in parallel, radioactive contaminated water may not flow evenly to all the decontamination devices 103, and the radiation dose from the decontamination device 103 becomes unevenly high, and the administrator May be exposed. As in Configuration Example 3, by providing a branch pipe 113a upstream of the decontamination apparatus 103 and a merging pipe 113b downstream of the decontamination apparatus 103, and by providing a water-sealed pipe 114 that maintains the branch pipe 113a in a water-sealed state. Thus, radioactive contaminated water can be uniformly introduced into all the decontamination devices 103. Further, the water seal tube 114 is provided with a siphon break mechanism 115 as a mechanism for preventing the inside of the tube from becoming a negative pressure, and treated radioactive contaminated water stored in the water seal tube 114 without causing a siphon phenomenon. Make it possible to discharge treated water. As the siphon break mechanism 115, a mechanism provided with an air suction pipe or an air suction valve can be used. Alternatively, instead of providing the siphon break mechanism 115 as a mechanism for preventing the inside of the pipe from becoming negative pressure, the water seal pipe 114 can be made to have a size that does not cause a siphon phenomenon (does not become full). According to the configuration example 3, the radioactive contaminated water is evenly distributed to all the decontamination devices 103 depending on the partial pressure of the water seal during light rain and the differential pressure generated in the adsorbent filling section of the decontamination device 3 during heavy rain. Can be introduced. By uniformly introducing radioactive contaminated water to all the decontamination devices 103, the consumption of the adsorbent can be equalized, and monitoring of all the decontamination devices 103 by representatively monitoring any decontamination device 103 It is possible to grasp the whole situation without performing.

1: roof 2: rainwater pipe 2a: upper part 2b of rainwater pipe: lower part 21a, 21b, 22a, 22b, 221a, 221b: connecting part 23a, 23b, 231a, 231b: horizontal pipe 24a, 24b, 241a, 241b : Branch pipe 232a, 232b, 233a, 233b: Annular pipe 3: Decontamination device 4: Rainwater discharge path 5, 52, 53: Decontamination cartridge container 5a: Water-impervious side surface 5b of decontamination cartridge container 5b: Decontamination Water-absorbing bottom surface 5c of cartridge container for decontamination: mounting portion 6 for cartridge container for decontamination: first adsorbent filling portion 7: second adsorbent filling portion 7a: water-blocking side surface 7b of second adsorbent filling portion: Water-permeable bottom surface 7c of second adsorbent filling section: gripping sections 62a, 62b, 64 of second adsorbent filling section: flanges 8, 82, 83: tubular member 9: gasket 100: first flow 101: second passage 102: solid-liquid separator 103: decontamination apparatus 104: Mizufukan (siphon tube)
105: open / close valve 106: pressure valve 113a: branch pipe 113b: merge pipe 114: water seal pipe 114a: water seal pipe inlet 114b: water seal pipe outlet 115: siphon break mechanism

Claims (14)

A decontamination cartridge container to be used by attaching to rainwater piping,
A side surface formed by laminating at least two types of water-impermeable filter cloths,
A bottom formed from a water-permeable filter cloth,
Covered with rubber having a vertical portion sewn to the upstream end of the side surface, and a horizontal portion extending so as to be sandwiched between two gaskets to be attached to the rainwater piping when the cartridge container is attached to the rainwater piping. Mounting portion formed from the filtered cloth,
At least a portion of the side surface, a suspension band sewn to extend from the upstream end to the downstream end of the side surface,
A cartridge container for decontamination, which is a bottomed bag-like body having a hanging ring sewn to the hanging band and detachably hung on a gasket. The decontamination cartridge container,
A first adsorbent filling section provided at a lower portion of the bottomed bag-like body and filled with an adsorbent for adsorbing radioactive nuclides;
A second adsorbent filling section, which is removably positioned above the first adsorbent filling section and is filled with an adsorbent for adsorbing radionuclides in a bag having a bottom surface made of filter cloth;
The cartridge container for decontamination according to claim 1, comprising: The first adsorbent-filled section includes a bag having a body made of a water-blocking filter cloth and a bottom part made of a water-permeable filter cloth, and the adsorbent positioned in the bag,
The second adsorbent-filled portion includes a bag having a body made of a water-blocking or water-permeable filter cloth and a bottom part made of a water-permeable filter cloth, and including the adsorbent positioned in the bag. The cartridge container for decontamination according to claim 2, characterized in that: The decontamination cartridge container according to claim 3, wherein the adsorbent in the first adsorbent filling section has a larger dimension than the adsorbent in the second adsorbent filling section. An adsorbent bag removably attached as the first and second adsorbent filling portions of the cartridge container for decontamination according to any one of claims 2 to 4,
A body made of a filter cloth that is impermeable or water-permeable,
A bottom made of a water-permeable filter cloth,
A space for locating the adsorbent defined by the body and bottom,
An annular reinforcing portion sewn around the entire upper end of the trunk,
A suspension band sewn to the torso so as to extend beyond the upper end of the torso,
Adsorbent bag having. The adsorbent in the first adsorbent filling section is larger in size than the adsorbent in the second adsorbent filling section, and the body of the adsorbent bag is made of a water-permeable filter cloth. An adsorbent bag according to claim 5. The cartridge container for decontamination according to any one of claims 2 to 4,
Claiming the adsorbent bag according to claim 5 or 6 as the first and second adsorbent filling sections, and after a predetermined time has elapsed, replacing the adsorbent bag of the second adsorbent filling section,
A decontamination method, further comprising replacing the adsorbent bag in the first adsorbent filling section after a lapse of a predetermined time. A radioactive contamination having the cartridge container for decontamination according to claim 1 or 2, a tubular member surrounding the cartridge container, and a flange for attaching the tubular member to rainwater piping, and being used by attaching to the rainwater piping. Water decontamination equipment. A plurality of combinations of the cartridge container, the tubular member, and the flange are provided, a horizontal pipe provided between each tubular member and the rainwater pipe, and radioactive contaminated water is diverted from the horizontal pipe to each tubular member. 9. The branch pipe according to claim 8, further comprising: a branch pipe to be connected; a connection part provided between each branch pipe and each tubular member; and a flange connection part that attaches each tubular member to each connection part in a fluid-tight state. Decontamination equipment for radioactive contaminated water. A plurality of combinations of the cartridge container, the tubular member, and the flange are provided, a plurality of horizontal pipes provided between each cartridge container and the rainwater pipe, and a plurality of horizontal pipes connected to the plurality of horizontal pipes. An annular pipe, a branch pipe for diverting radioactive contaminated water from the annular pipe to each cartridge container, a connection portion provided between each branch pipe and each cartridge container, and a connection portion for each cartridge container. The decontamination apparatus for radioactive contaminated water according to claim 8, further comprising: a flange connection portion mounted in a fluid-tight state. The radioactive contaminated water decontamination device according to any one of claims 8 to 10, wherein a cross-sectional area of the cartridge container is equal to or wider than a cross-sectional area of the rainwater pipe. A solid-liquid separation device, the decontamination device for radioactively contaminated water according to any one of claims 8 to 11, and a first flow path including a water seal tube, and a second flow provided vertically along the building wall surface. A rainwater pipe including a path and a switching valve for switching between the first flow path and the second flow path. The solid-liquid separation device, the decontamination device for radioactive contaminated water according to claim 9 or 10, and a first flow path including a water seal tube, and a second flow path provided vertically along the building wall surface, Including a switching valve for the first flow path and the second flow path,
A rainwater pipe, wherein the horizontal pipe is connected to the first flow path, and the water sealing pipe is connected to the first flow path at a position above a connection between the first flow path and the horizontal pipe. 14. The rainwater pipe according to claim 13, wherein the water sealing pipe is provided with a mechanism for preventing the inside of the pipe from becoming negative pressure.