JP5801168B2 - Filtration tank component and filtration tank using the same - Google Patents

Description

  The present invention relates to a filter tank constituent member, and also relates to a filter tank using the filter tank constituent member.

  In order to reduce the burden of sewage treatment by removing pollutants contained in road drainage, a rainwater filter disclosed in Japanese Utility Model Registration No. 3148921 (Patent Document 1) has been proposed.

  As shown in FIG. 22, the rainwater filter causes road surface drainage flowing from the inflow pipe b connected to the outer peripheral surface of the upper end of the outer cylinder a to flow down between the outer cylinder a and the inner cylinder c, and is connected to the communication section. It is made to flow into the inner cylinder c from d. In the inner cylinder c, the filter medium g is accommodated in a space defined between the lower filter plate e and the upper filter plate f, and the waste water flowing into the inner cylinder c moves down the filter medium g. The pollutant is filtered by the filter medium g while passing upward from the pipe, and is discharged to the outside from an outflow pipe h provided through the outer cylinder a at the upper part of the inner cylinder c. In addition, when rainwater with less pollutant flows from the inflow pipe b after the start of rainfall, the inflowing rainwater is discharged directly from the outflow pipe h without passing through the filter medium g. It was made to be done.

The filter medium g is preferably made of foamed polypropylene having a high ability to adsorb lipophilic substances, and the filter medium g includes a lid j that closes the upper end of the outer cylinder a and the upper filter plate f. The filter medium g can be exchanged through the upper end k of the outer cylinder a. The upper filter plate f is substantially at the same height as the lower end m of the outflow pipe h. Therefore, the upper end n of the filter medium g was located at a position much lower than the lower end m.

  By the way, for example, when a radioactive material leakage accident occurs at a nuclear power plant, the released radioactive material or dust containing radioactive material is carried by the wind or contained in rainfall to the fields, roads, roofs of buildings, etc. When descending over a wide range, it is extremely important to effectively decontaminate the radioactive material in order to prevent exposure.

  For example, radioactive material that has fallen on the roof of a building is collected together with rainwater and flows into gutters through rain gutters. It is easy to descend to the roof again by flying and flying. Thus, even if the radioactive material is temporarily removed from the roof, the contamination of the roof will continue for a long period of time.

  For this reason, the inflow of radioactive material into the side groove or the like continues for a long period of time. And since the radioactive substance which flowed into the side ditch etc. in this way is easy to be adsorbed by the sludge accumulated in the side ditch etc., the periphery of the building is easily contaminated with the concentrated radioactive substance. In order to prevent such contamination as much as possible, it is necessary to decontaminate radioactive substances in the rainwater flowing down the rain gutter. Particularly in nursery schools, kindergartens, and elementary schools, it can be said that the need for decontamination is higher in view of the fact that the surroundings of buildings are contaminated with concentrated radioactive substances because the effects of radiation on infants and children are greater.

  The need for decontamination of radioactive substances is not limited to the roof of buildings, but is necessary in various places such as the walls of buildings and roads. It is desirable to be able to do it efficiently.

  Therefore, the rainwater filter described in Patent Document 1 may be used. However, this rainwater filter is only for the purpose of removing contaminants contained in the road surface drainage, and efficiently removes radioactive substances. Until decontamination was not considered.

Utility Model Registration No. 3148921

  The present invention was developed in view of the above-mentioned conventional problems, and an object of the present invention is to provide a filtration tank constituent member for configuring a filtration tank capable of efficiently filtering water to be treated. Another object of the present invention is to provide a filtration tank that can efficiently filter the water to be treated containing radioactive substances.

In order to solve the above problems, the present invention employs the following means.
That is, the filtration tank constituent member according to the present invention is a filtration tank constituent member that constitutes a filtration tank for filtering water to be treated, and is disposed at a required height position in the filtration cylinder and the filtration cylinder and pulled up. A plate-like support member removable from the filter cylinder, and the plate-like support member is provided with water passage holes in the vertical direction, and a filter medium layer on the lower surface portion and the upper surface portion of the plate-like support member. Is provided. And the 1st filter medium layer provided in the said lower surface part is attached to this lower surface part so that attachment or detachment is possible, and when the said plate-shaped support member is lifted and taken out outside, this 1st filter medium layer is simultaneously The second filter medium layer provided on the upper surface portion is installed on the upper surface portion by its own weight and separated from the upper surface portion. The second filter medium layer can be lifted and taken out to the outside. The lower part of the filtration cylinder has a water intake portion for introducing the water to be treated into the filtration cylinder, and the upper part of the filtration cylinder has the filtered treated water in the filtration cylinder. An outlet for discharging to the outside is provided, and the upper surface portion of the plate-like support member is located at a position lower than a lower end of the outlet, and is above the upper surface portion and A puddle space is formed below the lower end.

Further, the filtration tank according to the present invention is provided with a plate-like support member at a required height position in the filtration cylinder having a water intake portion on the lower side and an outlet on the upper side. The plate-like support member is provided with water passage holes in the vertical direction, and the upper surface portion of the plate-like support member is a lower end of the outlet. Is located above the upper surface portion and below the lower end, and a reservoir space is formed on the lower surface portion, and a filter medium layer is provided on the lower surface portion and the upper surface portion of the plate-like support member. ing. And the 1st filter medium layer provided in the said lower surface part is attached to this lower surface part so that attachment or detachment is possible, and when the said plate-shaped support member is lifted and taken out outside, this 1st filter medium layer is simultaneously The second filter medium layer provided on the upper surface portion is installed on the upper surface portion by its own weight and separated from the upper surface portion, and the second filter material layer is provided on the upper surface portion. The filter medium layer can be lifted and taken out to the outside. Further, the water to be treated introduced and raised from the water intake portion into the filtration cylinder is accumulated in the water reservoir space so that a water reservoir portion is formed, and the water to be treated is placed in the water reservoir portion. The treated water filtered by the filter medium layer installed and filtered is discharged to the outside of the filter cylinder through the outlet.

In a more specific aspect of the filtration tank according to the present invention, a plate-like support member is disposed at a required height position in a filtration cylinder having a water intake portion on the lower side and an outlet on the upper side. The plate-like support member can be lifted and removed from the filter cylinder, the plate-like support member is provided with water passage holes in the vertical direction, and the upper surface portion of the plate-like support member is Located at a position lower than the lower end of the outflow port, a water pool space is formed above the upper surface portion and below the lower end, and a filter medium is formed on the lower surface portion and the upper surface portion of the plate-like support member. A layer is provided. And the 1st filter medium layer provided in the said lower surface part is attached to this lower surface part so that attachment or detachment is possible, and when the said plate-shaped support member is lifted and taken out outside, this 1st filter medium layer is simultaneously The second filter medium layer provided on the upper surface portion is installed on the upper surface portion by its own weight and separated from the upper surface portion, and the second filter material layer is provided on the upper surface portion. The filter medium layer can be lifted and taken out to the outside. Further, the second filter medium layer installed on the upper surface portion is composed of a lower filter medium layer existing below the lower end of the outflow port and an upper filter medium layer existing above the lower end, and the water intake The water to be treated which has been introduced and raised from the inside of the filtration cylinder is collected in the water reservoir space so that a water reservoir is formed, and the water to be treated is installed in the water reservoir. The treated water filtered and filtered by the filter medium layer is discharged to the outside of the filter cylinder through the outlet.

Another more specific embodiment of the filtration tank according to the present invention includes an outer cylinder body that has a bottom and an upper end openable portion that can be closed by a lid plate, and is placed in an upright state in the outer cylinder body. In addition, an inflow space is provided between the upper end of the filter cylinder and an inflow port through which water to be treated is introduced is provided in the side wall portion of the outer cylinder, and the side wall of the filter cylinder The part is provided with an outlet for discharging the treated water filtered in the filter cylinder to the outside of the outer cylinder. Further, a water intake portion for introducing the treated water flowing into the inflow space from the inflow port into the filtration cylinder is provided on the lower side of the filtration cylinder. A plate-like support member is disposed at a height position, and the plate-like support member can be pulled up and removed from the filter cylinder, and the plate-like support member has a water passage hole in the vertical direction. Yes. Further, the upper surface portion of the plate-like support member is positioned at a position lower than the lower end of the outlet, and a water reservoir space is formed above the upper surface portion and below the lower end, The water to be treated introduced and raised from the water intake portion into the filtration cylinder is accumulated in the water reservoir space so that a water reservoir portion is formed, and the water to be treated is installed in the water reservoir portion. The filtered water is filtered through the filter medium layer, and the filtered treated water is discharged to the outside of the outer cylinder through the outlet, and the filter medium layer is provided on the lower surface portion and the upper surface portion of the plate-like support member. Is provided. And the 1st filter medium layer provided in the said lower surface part is attached to this lower surface part so that attachment or detachment is possible, and when the said plate-shaped support member is lifted and taken out outside, this 1st filter medium layer is simultaneously The second filter medium layer provided on the upper surface portion is installed on the upper surface portion by its own weight and separated from the upper surface portion, and the second filter material layer is provided on the upper surface portion. The filter medium layer can be lifted and taken out to the outside.

In each of the filtration tanks, when the water to be treated contains a radioactive substance, the first filter medium layer provided on the lower surface portion is a filter medium bag in which a piece of foamed polypropylene is accommodated in a mesh bag. The filter medium bag is detachably attached to the lower surface portion , and the first filter medium layer is lifted simultaneously when the plate-like support member is lifted and taken out to the outside. The second filter medium layer provided on the upper surface is configured as a filter medium bag in which granular zeolite is accommodated in a mesh bag, and the filter medium bag is formed on the upper surface of the plate-like support member. It is preferable that the filter medium bag is lifted up and taken out to the outside.

  In the filtration tank, when the water to be treated contains a radioactive substance in which radioactive substances dropped on the roof of the building are collected together with the rainwater, the outer cylinder is installed on the ground. Good.

The present invention has the following excellent effects.
(1) A filtration tank constituting member according to the present invention comprises a filtration cylinder, and a plate-like support member that is disposed at a required height position in the filtration cylinder and is detachable from the filtration cylinder, The plate-like support member is provided with water passage holes in the vertical direction, and a filter medium layer is installed on the upper surface portion of the plate-like support member by its own weight. The lower part of the body has a water intake portion for introducing the water to be treated into the filtration cylinder, and the upper part of the filtration cylinder is a stream for discharging the filtered treated water to the outside of the filtration cylinder. There is an exit. Further, the upper surface portion of the plate-like support member is positioned at a position lower than the lower end of the outflow port, and a water pool space is formed above the upper surface portion and below the lower end. ing. And the filtration tank which concerns on this invention is comprised by installing a filter-medium layer at least on the upper surface part of the said plate-shaped support member using this filtration tank structural member.

  Therefore, according to the present invention, the radioactive substance contained in the water to be treated can be filtered in the water reservoir portion of the water reservoir space. In the water reservoir, the contact time between the water to be treated and the filter medium layer can be secured longer, so that radioactive substances can be filtered efficiently.

  If the upper surface portion of the plate-like support member is set at the same height as the lower end of the outlet, the water that has risen through the water passage holes of the plate-like support member is placed on the upper surface portion of the filter medium. Since the bottom portion of the layer is easy to pass through toward the outlet, the contact between the water to be treated and the filter medium layer becomes insufficient, and the filtration efficiency of radioactive substances and the like deteriorates, but the water pool portion is formed. According to the present invention, the filtration can be performed efficiently as described above.

(2) When the filtration tank is configured by placing the filtration cylinder in an upright state in the outer cylinder, it is easy to reduce the water level difference between the treated water inlet and the treated water outlet. Thus, the water to be treated can be discharged to the outlet through natural flow.

(3) In the case where the water to be treated contains a radioactive substance, when the first filter medium layer and the second filter medium layer are provided on the lower surface portion and the upper surface portion of the plate-like support member, After the pollutant in water is effectively removed by the first filter medium layer, the radioactive substance can be effectively decontaminated by the second filter medium layer. When the second filter medium layer that adsorbs the radioactive substance is installed on the upper surface portion in a state separated from the upper surface portion of the plate-like support member, the second filter medium layer that does not need to be replaced over a long period of time. There is an advantage that only the second filter medium layer having a high exchange frequency can be easily pulled up and replaced while leaving one filter medium layer as it is.

(4) In particular, in the case where an overflow port is provided at a position higher than the outlet in the filtration cylinder, when the amount of water to be treated to the inlet space per unit time is large, the water level in the inlet space After the water level exceeds the set water level, the water to be treated can be overflowed from the overflow port into the filtration cylinder, thereby preventing the backflow phenomenon of the water to be treated due to the abnormal rise in the water level in the inflow space. In this case, when the filter medium layer installed on the upper surface of the plate-like support member is configured to have an upper filter medium layer located above the lower end of the outlet, it flows into the filter cylinder due to overflow. The radioactive material and the like contained in the treated water can also be filtered by the filter medium layer thereon.

  At this time, by setting the upper surface portion of the upper filter medium layer at a position lower than the upper end of the outflow port, the overflow of the overflowed water including the treated water is caused in the upper part where the outflow port is opened. It will be done smoothly.

(5) In the case where the overflow port is not provided, even when the filter medium layer is configured to have the upper filter medium layer located above the lower end of the outlet, the contact time between the water to be treated and the filter medium layer is reduced. Since it can be ensured for a longer time, radioactive substances and the like can be filtered more efficiently.

(6) Further, the plate-like support member is formed in a disc shape, and a vertical bar extending above the plate-like support member is provided on the opposite side of the outer peripheral edge portion thereof, so that the When the upper end portions can be connected to each other by a detachable handle member, a wide space can be formed above the plate-like support member by removing the handle member. Therefore, the replacement work of the second filter medium layer can be easily and efficiently performed through the wide space.

(7) In particular, in the case where the treated water includes a radioactive material in which the radioactive material dropped on the roof of the building is collected together with the rainwater, when the outer cylinder is installed on the ground, the radioactive material The filter tank for decontaminating can be easily installed in the vicinity of the building without requiring special civil engineering work, and piping is also easy. Further, since the filtration tank is installed on the ground, it can be easily moved.

It is explanatory drawing which shows the use condition of the filtration tank which concerns on this invention. It is sectional drawing which shows the structure of the filtration tank. It is a disassembled perspective view which shows an outer cylinder body. It is a disassembled perspective view which shows a filtration tank. It is a perspective view which shows the attachment state of the inflow tube in a filtration tank. It is a perspective view which shows the attachment state of the outflow pipe | tube in a filtration tank. It is a perspective view which shows the engagement procedure of the handle with respect to the L-shaped engagement groove provided in the filtration cylinder, and this L-shaped engagement groove. It is a perspective view which shows a plate-shaped support member, the handle for raising provided in it, and a 1st filter medium layer. It is the front view which shows the state which connected the upper end part of both the vertical bars standing by the plate-shaped support member with the handle member, and the front view which shows the state which removed this handle member. It is sectional drawing which shows the state which provided the 1st filter material layer in the lower surface part of the plate-shaped support member accommodated in the filter cylinder, and installed the 2nd filter material layer in the upper surface part. It is sectional drawing which shows the state which removed the 2nd filter medium layer. It is a perspective view which shows the state which removed the 1st filter medium layer. It is sectional drawing which shows the other Example of a filtration tank. It is sectional drawing which shows the other accommodation state of the 1st filter medium layer in a filter cylinder. It is a perspective view which shows the other aspect of the water intake part provided in the lower part side of the filtration cylinder. It is sectional drawing which shows the other aspect of the water intake part provided in the lower part side of a filtration cylinder. It is sectional drawing which shows the other aspect of an inflow port and an outflow port. It is a perspective view which shows the other aspect of the handle part provided in the upper end part of the vertical bar material standingly arranged by the plate-shaped support member. It is a perspective view which shows the other aspect of an L-shaped engagement groove. It is a perspective view which shows the other aspect which connected the upper end part of the vertical bar material standingly arranged by the plate-shaped support member with the handle member. It is sectional drawing which shows the other aspect which prevents the plate-shaped support member from raising. It is sectional drawing which shows the structure of the conventional rainwater filter, and its effect | action.

  1-2, the filtration tank 1 which concerns on this invention is applied in order to decontaminate the radioactive substance in the to-be-processed water 5 by which the radioactive substance which fell to the roof 3 of the building 2 was collected with rain water. , It is installed on the ground 6 in the vicinity of the building 2.

  The schematic configuration of the filtration tank 1 will be described. In this embodiment, as shown in FIG. 2, an outer cylindrical body 10 having a bottom and an upper end open portion 7 that can be closed by a lid plate 9; And a filtration cylinder 13 which is stored in a standing state in the cylinder 10 and whose upper and lower ends 11 and 12 are opened. An inflow space 15 is provided between the outer cylinder 10 and the filtration cylinder 13. A water intake 17 is provided on the lower side 16 of the filter cylinder 13.

  In addition, a plate-like support member 20 provided with a water passage hole 19 in the vertical direction is disposed at a required portion in the filter cylinder 13, and the lower surface portion 21 of the plate-like support member 20 has the above-mentioned treatment target. A first filter medium layer 22 for removing contaminants in the water 5 is provided, and the upper surface portion 23 of the plate-like support member 20 adsorbs radioactive substances in the water to be treated 5 for decontamination. A second filter medium layer 25 is provided as the filter medium layer 18. In addition, an inlet 27 for allowing the treated water 5 to flow in is provided in the side wall portion 26 of the outer cylindrical body 10, and the side wall portion 29 of the filtration cylinder 13 is more than in the inlet 27. An outlet 30 is provided at a lower position for discharging the treated water filtered out to the outside of the outer cylindrical body 10, and the inlet 27 and the outlet 30 in the present embodiment are the left and right opposing sides 31. , 32.

  In this embodiment, the filtration tank 1 is composed of a combination of the outer cylinder 10 and the filtration cylinder 13, so that the inflow space 15 is configured as described above, and the outlet 30 is Since it is provided at a position lower than the inlet 27, a water level drop can be formed between the lower end 28 (FIG. 2) of the inlet 27 and the lower end 85 of the outlet 30. Therefore, the treated water 5 that has flowed into the inflow space 15 can be discharged to the outlet 30 by natural flow. That is, the treated water 5 that has flowed into the inflow space 15 from the inlet 27 is introduced into the filter cylinder 13 from the intake portion 17 and rises, and passes upward through the first filter medium layer 22. Then, it further rises through the water passage hole 19 provided in the plate-like support member 20 and flows into the second filter medium layer 25, and then flows into the outflow pipe 33 through the outlet port 30. It is discharged to a drainage facility (for example, a side groove 35a) 35 outside the outer cylindrical body 10.

  Hereinafter, the configuration of the filtration tank 1 will be described more specifically. As shown in FIGS. 2 to 4, the outer cylinder 10 is configured by using a vinyl chloride cylindrical member 39 with upper and lower ends 36 and 37 (FIG. 3) opened. The lower end 37 of the cylindrical member 39 is closed by a vinyl chloride dish-shaped bottom plate member 41 to form a bottom portion 42 (FIG. 2). As shown in FIG. 3, the dish-like bottom plate member 41 has a dish-like shape in which a standing wall piece 45 is erected on the outer peripheral edge of the bottom surface portion 43 having a disk shape and the upper end is opened. The bottom surface 42 of the outer cylinder 10 is configured by the outer peripheral surface 46 of 45 being brought into contact with and welded to the lower end portion 47 of the inner peripheral surface of the cylindrical member 39.

  Then, as shown in FIGS. 2 to 4, a ring-shaped lid receiving member 50 having a fitting recess 49 for fitting the disk-shaped lid plate 9 is attached to the upper end portion of the cylindrical member 39. ing. The lid plate 9 is formed in a disc shape using, for example, a striped steel plate, and a U-shaped handle 52 is provided at the center portion of the upper surface 51 thereof. The ring-shaped lid receiving member 50 is attached to the upper end portion 54 by fitting and bonding the upper end portion 54 of the cylindrical member 39 to an annular groove 53 provided on the outer peripheral portion of the lower end thereof. As a result, the outer cylinder body 10 is configured, and the cover plate 9 is fitted into the insertion recess 49 of the ring-shaped lid receiving member 50, so that the outer cylinder body 10 is The lid 9 can be closed.

  In addition, in the present embodiment, the inflow port 27 is formed as an inflow port forming hole 55 formed by opening the side wall portion (side wall portion of the outer cylindrical body 10) 26 of the cylindrical member 39 in a circular shape, as shown in FIG. It is formed with a downstream end opening 59 of the inflow pipe 56 formed by inserting the downstream end portion 57 of the circular inflow pipe 56 into (FIG. 3). In this embodiment, as shown in FIGS. 5 and 2, the inflow pipe 56 is provided with a curved fixing plate 61 that is in contact with and bonded to the outer surface 60 of the side wall portion 26 of the outer cylindrical body 10. And is fixed to the outer cylindrical body 10.

  In this embodiment, the outer cylinder 10 having such a configuration is installed in a standing state on the ground 6 in a state of being close to the building 2 as shown in FIG. As shown in FIGS. 1 and 5, the upstream end portion 62 of the inflow pipe 56 communicates with a lower end portion 65 of a rain gutter 63 for draining rainwater on the roof 3 of the building 2. Here, the term “building” refers to a general concept of a building or a building that is made for a person to live or store, in addition to a house, a store, a factory, or a warehouse. In the present embodiment, since the filtration tank 1 is installed on the ground 6, the filtration tank can be easily installed in the vicinity of the building without requiring special civil engineering work, and piping is easy. The transfer of the filtration tank 1 is also easy.

  Taking the dimensions of the main part of the outer cylinder 10 having such a configuration as an example, the height of the outer cylinder 10 is set to about 900 mm, the outer diameter is set to about 420 mm, and the inner diameter is set to about 400 mm. Yes. The diameter of the inlet 27 is set to about 100 mm, and the upper end 65 of the inlet 27 is set to a position about 160 mm below the upper end 66 of the outer cylinder 10 in this embodiment. Further, on the opposite side of the side wall portion 26 from the side where the inflow port 27 is provided, as shown in FIGS. 2 and 4, it opposes an outflow port forming hole 73 to be described later which forms the outflow port 30. In this state, an insertion hole 69 for the outflow pipe 33 is provided.

  In the present embodiment, as shown in FIG. 4, the filter cylinder 13 has a cylindrical shape with upper and lower end portions 70 and 71 opened, and is made of, for example, vinyl chloride. The lower end side 16 of the filtration cylinder 13 is provided with the water intake portion 17 for introducing the treated water 5 flowing into the inflow space 15 from the inlet 27 into the filtration cylinder 13. . In this embodiment, as shown in FIGS. 2 and 4, the water intake portion 17 is provided by cutting off the lower end portion 72 of the side wall portion 29 of the filter cylinder 13 in an inverted U shape. In the circumferential direction of the filter cylinder 13, three are provided at an angular pitch of 120 degrees.

  In the present embodiment, the outlet 30 is formed by inserting the upstream end portion 76 of the tubular outlet pipe 33 into the outlet forming hole 73 formed by opening the side wall 29 of the filter cylinder 13 in a circular shape. The upstream end opening 77 of the outflow pipe 33 is formed, and the inner diameter is set to about 100 mm. The filtration cylinder 13 having such a configuration is housed in the outer cylinder 10 in an upright state with the axis line staggered. In the present embodiment, the outlet formation hole 73 is set to be close to the insertion hole 69. The reason why the outflow port formation hole 73 and the insertion hole 69 are brought close to each other is to facilitate the insertion of the upstream end portion 76 of the outflow pipe 33 inserted through the insertion hole 69 into the outflow port formation hole 73. As shown in FIGS. 5 to 6, the outflow pipe 33 is in contact with the outer surface 60 of the side wall portion 26 of the outer cylinder body 10 via a curved fixing plate 80 that is adhered to the outer surface 60. It is fixed to the body 10. As shown in FIG. 1, the outflow pipe 33 has a downstream opening end 81 of the drooping pipe portion 33 a opened to a drainage facility (drainage channel, rainwater trough, etc.) 35.

  The filtration cylinder 13 having such a configuration is such that the portions 82, 82, 82 of the lower surface 24 between the water intake portions 17, 17 are welded to the bottom upper surface 83 of the outer cylinder 10 and are in an upright state. Yes. For example, the dimensions of the main part of the filter cylinder 13 are set such that the vertical height of the filter cylinder 13 is set to about 820 mm, its outer diameter is set to about 315 mm, and its inner diameter is set to about 300 mm. The diameter of the outlet 30 is set to about 100 mm, and the height from the bottom upper surface 83 of the lower end 85 of the outlet 30 is set to about 480 mm.

  In the present embodiment, in order to prevent backflow of the treated water 5 flowing into the inflow space 15, as shown in FIGS. 2 and 4, the side wall 29 is provided on the upper end side of the filtration cylinder 13. The overflow port 86 is provided at a position higher than the outflow port 30. In this embodiment, the overflow port 86 is formed as a rectangular opening having a lower edge 87 which is horizontal.

  Further, as shown in FIG. 4, an L-shaped engagement groove for engaging an engagement protrusion 92 of a handle 91, which will be described later, is formed on the opposite side 90, 90 of the upper end edge portion 89 of the filter cylinder 13. 93 is provided. As shown in FIG. 7, the L-shaped engagement groove 93 includes a vertical engagement groove 95 that guides the engagement protrusion 92 downward, and a lower end 96 of the vertical engagement groove 95, and the filter cylinder. 13 is formed from a lateral engagement groove 97 extending in the circumferential direction and guiding the engagement protrusion 92. In the present embodiment, the distal end portion of the lateral engagement groove 97 has a diameter larger than the groove width of the lateral engagement groove 97, for example, a wide engagement portion that extends in the vertical direction, for example, a circular hole. 99.

  In addition, as shown in FIG. 2, the plate-like support member 20 for providing the first filter medium layer 22 and the second filter medium layer 25 is pulled up inside the filter cylinder 13 by pulling up. The cylindrical body 10 is disposed so as to be able to be taken out through the upper end opening 7. In this embodiment, as shown in FIGS. 4 and 8, the plate-like support member 20 has a smaller diameter than the inner diameter of the filter cylinder 13 and has, for example, a disk shape made of vinyl chloride. The plate-like support member 20 has a diameter of about 300 mm and a thickness of about 30 mm, and a large number of the water passage holes 19 penetrating in the vertical direction are provided in an evenly distributed state. In this embodiment, as shown in FIGS. 2 and 8, the water passage hole 19 is formed as a slit-like through hole elongated in the circumferential direction, and the plate-like support member 20 has many different diameters around the center. A large number of concentric circles are provided.

  The plate-like support member 20 is provided with a pulling handle 100. The handle 100 is made of, for example, vinyl chloride. As shown in FIG. 8, as shown in FIG. In addition, a T-shaped connecting member 105 is connected to the upper end portions 103 of the both vertical bars 102, 102. As shown in FIG. 8, the T-shaped connecting member 105 is formed on the lower surface portion of the central portion in the length direction of the horizontal cylindrical portion 106 that has a long circular cylindrical shape in the radial direction of the plate-like support member 20. A vertical cylindrical portion 109 that protrudes in the direction and has a circular cylindrical shape with an open lower end is provided so as to project as a whole and has a T-shape. An upper end portion 103 of the vertical bar member 102 is inserted and fixed to the vertical cylindrical portion 109, and an outer cylindrical portion of the horizontal cylindrical portion 106 that protrudes outward in the radial direction is formed. The engaging protrusion 92 is engageable with the L-shaped engaging groove 93. Further, the inner cylinder portion protruding inward in the radial direction is cut off at the lower half, and is formed as a protruding half cylinder portion 110 on the upper side. As shown in FIGS. 2, 4, and 9 </ b> A, both the half cylinder portions 110 and 110 facing each other can be connected by a handle member 111.

  The handle member 111 is formed of, for example, a linear cylindrical member. As shown in FIG. 9A, the both end portions 112 and 112 are engaged with the engagement concave portions 113 and 113 of the half cylinder portions 110 and 110, respectively. By fitting into the two, the half cylinder parts 110 and 110 can be connected to each other by the handle member 111. In this connected state, the plate-like support member 20 can be raised and lowered by grasping the handle member 111. Further, as shown in FIG. 9B, by removing the both end portions 112, 112 from the engaging recesses 113, 113, the space between the opposed half cylinder portions 110, 110 can be largely opened.

  And the lower surface part 21 of the said plate-shaped support member 20 is provided with the said 1st filter medium layer 22 which removes the pollutant in the said to-be-processed water 5 as shown in FIG. 2, FIG. For example, as shown in FIG. 8, the first filter medium layer 22 is configured as a filter medium bag 22a in which a piece of foamed polypropylene having a specific gravity smaller than that of water is accommodated in a mesh bag 115 made of polyester or the like. The mesh size of the mesh bag 115 is set so that a piece of foamed polypropylene having a particle size of, for example, 1 to 3 mm does not spill.

  The filter bag 22a has a vertical thickness of, for example, 100 mm. In this embodiment, as shown in FIGS. 4 and 8, the filter bag 22a has a cylindrical shape having an outer diameter equal to or larger than the inner diameter of the filter cylinder 13. It has the said upper part 116 which exhibited, and the lower part 117 which exhibits a tapering shape toward the downward direction. And, on the opposite side of the upper surface portion 119 of the filter medium bag 22a, one end portions 121, 121 of two binding materials 120, 120 having a band shape, a string shape or the like through which the water passage hole 19 can be inserted, It is attached by bonding or sewing. After passing the binding material 120, 120 through the required water holes 19, 19 of the plate-like support member 20, the other end portions 122, 122 of the binding material 120, 120 are mutually connected, for example, a planar fastener or the like. As shown in FIG. 4, the filter medium bag 22 a can be detachably attached to the plate-like support member 20.

  When the plate-like support member 20 having the filter medium bag 22a provided on the lower surface portion 21 in this way is accommodated in the filter cylinder 13 as shown in FIG. In a state where the upper ends are connected to each other by the handle member 111, the handle member 111 is grasped with one hand and the plate-like support member 20 is lowered in the filter cylinder 13. At this time, the left and right engaging protrusions 92, 92 are aligned with the vertical engaging grooves 95, 95 of the filter cylinder 13 as shown by an arrow F1 in FIG. Lower. After the engagement protrusions 92 and 92 are fitted to the lower ends of the vertical engagement grooves 95 and 95, the handle member 111 is moved around the filter cylinder 13 as shown by an arrow F2 in FIG. Rotate forward in the direction. Thus, the engagement protrusions 92 and 92 can be inserted into the lateral engagement grooves 97 and 97. Finally, the engagement protrusions 92 and 92 are fitted into the wide engagement parts 99 and 99. .

  In this state, even if buoyancy is applied to the plate-like support member 20 and the filter medium bag 22a, the engagement protrusions 92 and 92 are located in the lateral engagement grooves 97 and 97. The mating protrusions 92 and 92 are received by the upper edge portion 98 of the lateral engagement groove 97, and the plate-like support member 20 is prevented from being lifted. In particular, in the present embodiment, the engagement protrusions 92 and 92 are fitted into the wide engagement parts 99 and 99 connected to the lateral engagement grooves 97 and 97. 92 and 92 will be prevented from coming off more reliably, and the plate-like support member 20 will be placed more stably. Therefore, the filter medium bag 22a can be maintained in a state of being stably disposed at a required position. Thereafter, the handle member 111 is removed, and this is taken out of the outer cylinder 10.

  In the state where the filter medium bag 22a (first filter medium layer 22) is thus provided, the upper surface portion 23 of the plate-like support member 20 is the lower end of the outlet 30 as shown in FIGS. It is located at a position lower than 85. In this embodiment, it is located at a low position of about 50 mm. Since the upper surface portion 23 is located at a position lower than the lower end 85 in this way, a water reservoir space 94 is formed above the upper surface portion 23 and below the lower end 85. The second filter medium layer 25 is provided in the water reservoir space 94.

  The filter medium bag 22a is accommodated in the filter cylinder 13 in this way, but since the lower portion 117 is formed in a tapered shape, the filter medium bag 22a is accommodated in the filter cylinder 13. It can be done easily. And even if the outer diameter of the upper part 116 of the filter medium bag 22a is slightly larger than the inner diameter of the filter cylinder 13, the filter medium bag 22a can be deformed, so that a part of the filter medium bag 22a is deformed inward. Thus, the filter medium bag 22a can be accommodated in the filter cylinder 13 in a close state. In this accommodated state, there is no gap between the outer peripheral portion 123 of the filter medium bag 22a (the first filter medium layer 22) and the inner peripheral surface 125 of the filter cylinder 13, so that the water to be treated can pass through the gap. The pollutant is effectively removed by the first filter medium layer 22 without slipping through.

  Further, in the present embodiment, the second filter medium layer 25 that adsorbs the radioactive substance contains granular zeolite having a diameter of 5 to 10 mm in, for example, a polyester mesh bag 126 as shown in FIGS. Thus, a filter medium bag 25a having a cylindrical shape is formed. The mesh size of the mesh bag 126 is set so as not to spill the zeolite, and the thickness of the filter material bag 25a in the vertical direction is set to about 100 mm. The second filter medium layer 25 having such a configuration is separated from the upper surface portion 23 in the present embodiment on the upper surface portion 23 of the plate-like support member 20 installed in the filtration cylinder 13. Install. Since the second filter medium layer 25 is formed using granular zeolite in this embodiment, the second filter medium layer 25 is stably installed on the upper surface portion 23 by its own weight, and there is no fear of being lifted by buoyancy. Therefore, it is not necessary to press down the upper surface portion 127 of the second filter medium layer 25 with the presser plate.

  In the present invention, the second filter medium layer 25 is installed on the upper surface portion 23 of the plate-like support member 20 in a state separated from the upper surface portion 23 for a long period (for example, 3 years). This is because only the second filter medium layer 25 that decontaminates the radioactive material can be frequently replaced while leaving the first filter medium layer 22 that does not need to be replaced as it is.

  After the plate-like support member 20 is installed in the filtration cylinder 13, the handle member 111 is removed as shown in FIG. 9B, so that the upper part of the plate-like support member 20 is opened largely. Can do. Therefore, the installation work can be performed without difficulty.

  In this embodiment, the second filter medium layer 25 installed in this way is formed with a lower filter medium layer (about 50 mm thick) 130 below the lower end 85 of the outlet 30 as shown in FIG. The upper filter material layer (about 50 mm thick) 131 exists on the upper side of the lower end 85. In the present embodiment, as shown in FIG. 10, the upper surface portion 127 of the upper filter material layer 131 is located lower than the upper end 133 of the outlet 30. For example, the outlet 30 is positioned at approximately half of the vertical height.

  In order to reduce the outflow resistance of the treated water, it is common practice to dispose the filter medium layer above the lower end 85 of the outlet 30 as described in, for example, Patent Document 1. It is not considered. In other words, it is considered that the discharge port 30 is not blocked by the filter medium layer even if the entire discharge port 30 is part of the original.

  Therefore, as in Patent Document 1, the water to be treated that has flowed into the filtration cylinder due to overflow passes through the outlet without being filtered.

  Even if it passes through in this way, there is no particular problem as long as it simply removes the pollutant contained in the water to be treated, such as in the case of filtration of road drainage. This is because there is almost no pollutant in the road drainage from the previous rainwater.

  However, in this embodiment, because the overflowed water to be treated contains a dangerous radioactive substance, the removal of the radioactive substance contained in the outlet 30 is prioritized even if the outflow resistance is somewhat sacrificed. The upper filter material layer 131 is provided above the lower end 85.

  When the filtration tank 1 having such a configuration is used, the water 5 to be treated, in which radioactive material that has fallen on the roof 3 of the building 2 is collected together with the rainwater, flows down the rain gutter 63, and passes through the inflow pipe 56. It flows into the inflow space 15 from the inflow port 27. The treated water 5 that has flowed into the inflow space 15 is introduced into the filter cylinder 13 from the water intake portion 17 and rises, passes through the first filter medium layer 22 in the upward direction, and then the plate shape. It further rises through a water passage hole 19 provided in the support member 20 and flows into the second filter medium layer 25. Thereafter, the gas flows into the outflow pipe 33 through the outlet 30 and is discharged to the outside of the outer cylindrical body 10. In this embodiment, it is discharged to the drainage facility 35.

  When the water 5 to be treated passes through the first filter medium layer 22, the pollutant contained in the water 5 to be treated is effectively removed by filtration or adsorption. And the radioactive substance in the to-be-processed water 5 which rose through the water flow hole 19 flows into the second filter medium layer 25 and is effectively decontaminated by adsorption. It is not always 100% decontaminated. In the present embodiment, since the water flow holes 19 are provided in a state of being evenly distributed on the plate-like support member 20, the water to be treated 5 rising at the upper surface portion 23 of the plate-like support member 20 is the first. Thus, the respective parts of the second filter medium layer 25 are in good contact with each other, and the radioactive material is decontaminated more efficiently.

  This decontamination is performed because the upper surface portion 23 of the plate-like support member 20 is positioned lower than the lower end 85 of the outlet 30 and the water reservoir space 94 is formed. A water reservoir 136 will be formed on the upper side. Since the second filter medium layer 25 is installed in the water reservoir 136, a longer contact time between the water to be treated and the filter medium layer can be secured. For this reason, adsorption of radioactive substances is promoted in the water reservoir 136. The treated water 137 decontaminated by flowing into the second filter medium layer 25 moves toward the outlet 30 and flows into the drain pipe 33. In this embodiment, since the upper half of the outlet 30 is open above the upper surface portion 127 of the second filter medium layer 25, the upper portion of the outlet 30 opened (this embodiment) In the upper half 30a), the treated water flows smoothly.

  When the amount of inflow per unit time flowing into the inflow pipe 56 is large and the water level in the inflow space 15 rises abnormally during heavy rain, etc., the filtration cylinder 13 is passed through the overflow port 86. The treated water 5 flows into the inside. In the present embodiment, since the lower edge 87 of the overflow port 86 has a horizontal straight line shape, when the water level in the inflow space 15 exceeds the lower edge 87, the lower edge 87 causes the filtration cylinder 13 It can be smoothly overflowed. The treated water 5 that has flowed into the filter cylinder 13 from the overflow port 86 is effectively decontaminated with radioactive material in the second filter medium layer 25, and passes through the outlet 30 to the outlet pipe 33. And is discharged to the outside of the outer cylindrical body 10. In this embodiment, since the upper filter medium layer 131 is provided above the lower end 85 of the outlet 30, the radioactive material in the water to be treated that has flowed in from the overflow port 86 is effectively treated by the upper filter medium layer 131. Can be adsorbed. In this embodiment, since the upper surface portion 127 of the upper filter medium layer 131 is located at a position lower than the upper end 133 of the outlet 30, the opened upper portion of the outlet 30 (the upper half in this embodiment). In 30a), the overflowed water including the treated water is smoothly discharged.

  If such a filtration process continues and a certain period of time elapses (for example, when about half a year elapses), the adsorption efficiency of the second filter medium layer 25 may decrease, or the radioactive material concentrated by adsorption may become a contamination source. The second filter medium layer 25 needs to be replaced frequently (for example, about once every six months). As shown in FIG. 6, the replacement work is performed by opening the lid plate 9 and then lifting the second filter medium layer 25 and taking it out through the upper end opening 7 of the outer cylinder 10. FIG. 11 shows a state in which the second filter medium layer 25 is removed from the upper surface portion 23 of the plate-like support member 20. Thereafter, a new second filter medium layer 25 is placed on the upper surface portion 23. In the present embodiment, the second filter medium layer 25 is installed in a state separated from the upper surface portion 23. Therefore, the second filter medium layer 25 can be lifted up and replaced with a new one. . When the second filter medium layer 25 is taken out and reinstalled (that is, when the second filter medium layer 25 is replaced), in this embodiment, the handle member 111 is removed as described above. Therefore, the upper side of the plate-like support member 20 can be widely opened (FIG. 9B). Therefore, the replacement of the second filter medium layer 25 can be performed with good workability, and the maintenance that is frequently performed can be facilitated.

  In addition, when the removal efficiency of the pollutant in the first filter medium layer 22 is deteriorated after about three years, as shown in FIG. 12, the grip member 111 attached as described above is gripped, The plate-like support member 20 is pulled up together with the filter medium bag 22a and taken out through the upper end opening 7. At this time, the second filter medium layer 25 is preferably pulled up in advance.

  When the plate-like support member 20 is pulled up in this way, as shown in FIG. 7B, the plate-like support member 20 is detached from the wide engagement portion 99 with the engagement protrusion piece 92 removed. After being positioned in the engagement groove 97, the engagement protrusion 92 is positioned in the vertical engagement groove 95 by rotating in a direction F3 opposite to the above in a horizontal plane. When the handle member 111 is lifted in this state, the first filter medium layer 22 can be pulled up and taken out to the outside through the upper end opening 7. In this state, the binding state of the binding materials 120, 120 of the first filter medium layer 22 is released, the first filter medium layer 22 is replaced with a new one, and binding is performed in the same manner as described above. The dressing materials 120 and 120 are bound again. Thereafter, the first filter medium layer 22 is installed at a required position in the filter cylinder 13 together with the plate-like support member 20. When the first filter medium layer 22 is replaced, the second filter medium layer 25 is also preferably replaced. By exchanging the first and second filter medium layers 22 and 25 in this way, it is possible to effectively continue the removal of pollutant substances by the first filter medium layer 22 and the decontamination of radioactive substances by the second filter medium layer 25. Become. In this way, radioactive materials that have fallen on the roof of the building can be decontaminated sequentially.

  The present invention is by no means limited to those shown in the above-described embodiments, and it goes without saying that various design changes can be made within the scope of the claims. One example is as follows.

(1) FIG. 13 shows another embodiment of the filtration tank 1 according to the present invention, which is configured by omitting the outer cylinder body 10. The filtration tank 1 is configured by using a bottomed filter cylinder 13, which has a water intake portion 17 on the lower side 151 of the filter cylinder 13 and an outlet 30 on the upper side 152. The plate-like support member 20 having the same configuration as described above is disposed at a required height position in the filtration cylinder 13, and the upper surface portion 23 of the plate-like support member 20 is a lower end 85 of the outlet 30. It is located at a lower position. Further, a water reservoir cavity 94 is formed above the upper surface portion 23 and below the lower end 85, and a decontamination filter medium layer that adsorbs radioactive substances in the water reservoir cavity 94, for example. 18 is provided by its own weight and separated from the upper surface portion. In this embodiment, the filter medium layer 18 is composed of a lower filter medium layer 130 existing below the lower end 85 of the outlet 30 and an upper filter medium layer 131 existing above the lower end 85. The reason why the upper filter medium layer 131 is provided in this embodiment is that the contact time between the water 5 to be treated and the filter medium layer 18 is made longer to improve the filtration efficiency.

  The treated water 5 introduced and raised from the water intake portion 17 into the filter cylinder 13 stays in the water reservoir space 94, whereby a water reservoir portion 136 is formed. The treated water 5 is introduced into the filtration cylinder 13 by a water level drop, or is fed by a pump and introduced into the filtration cylinder 13.

  In the water reservoir 136, the radioactive material is decontaminated by adsorption in the decontamination filter medium layer 18, and then the decontaminated treated water is discharged to the outside of the filter cylinder 13 through the outlet 30. . The first filter medium layer 22 can be provided in the same manner as in the above embodiment. In this case, in the same manner as in the above embodiment, the upper end portions 103, 103 of both vertical bars 102, 102 projecting on the opposite side of the outer peripheral edge of the plate-like support member 20 can be attached and detached with the handle member 111. By enabling the connection to the plate-shaped support member 20, a wide space can be formed above the plate-like support member 20 by removing the handle member 111. Therefore, the replacement work of the decontamination filter material layer 18 can be easily and efficiently performed through the wide space.

(2) The filter medium layer 18 includes various substances (for example, salt, iron, polycyclic aromatic carbonization, etc.) contained in the water to be treated in addition to the pollutants and radioactive substances contained in the water to be treated. Organic pollutants such as hydrogen, eutrophication salts such as nitrogen and phosphorus, heavy metals such as cadmium, and the like) can be used.

(3) When the filter medium layer 18 is provided only on the upper surface portion 23 of the plate-like support member 20 and is provided on both the upper surface portion 23 and the lower surface portion 21 of the plate-like support member 20. There is. When the filter medium layers 18 are provided above and below, even when the same type of filter medium is used, the particle diameter of the filter medium constituting each filter medium layer may be changed according to the purpose of filtration. For example, when setting the particle size of the filter medium layer on the lower side relatively large and setting the particle size of the filter medium layer on the upper side relatively small, the lower filter medium layer filters relatively large contaminants. Then, relatively small contaminants can be filtered with the upper filter medium layer. Since the filter medium layer 18 is installed in the water reservoir, the contact time between the water 5 to be treated and the filter medium layer 18 can be ensured longer, so that the filtration can be efficiently performed.

(4) The first filter medium layer 22 is for removing contaminants in the water to be treated, and in addition to the above-mentioned foamed polypropylene strips, activated carbon, other known filter media, and the like can be used. . Moreover, as long as the said 2nd filter medium layer 25 can adsorb | suck a radioactive substance, adsorbents, such as activated carbon and an ion exchange resin other than the above-mentioned zeolite, can also be used. In addition, when the to-be-processed water filtered with the filtration tank 1 which concerns on this invention contains a radioactive substance, the said 1st filter medium layer 22 may be abbreviate | omitted.

(5) When the filter medium layer 18 for decontamination is provided on the upper surface portion 23 of the plate-like support member 20, and the filter medium layer 18 constitutes the upper filter medium layer 131, a filter cylinder is caused by overflow. In order to more effectively perform decontamination of the water to be treated that has flowed into 13, the upper filter material layer 131 may cover the entire outlet 30. However, in order to make the outflow from the outlet 30 smoother, it is preferable that the upper surface portion 23 of the upper filter medium layer 131 is located at a position lower than the upper end 133 of the outlet 30. The degree of lowering is set as long as the decontamination effect by the upper filter medium layer 131 is more effectively performed and the resistance at the time of outflow from the outflow port 30 is not so much increased. .
Even when the water to be treated does not contain a radioactive substance, it is preferable to provide the upper filter material layer 131 as described above.

(6) The first filter medium layer 22 and the second filter medium layer 25 are configured as filter medium bags 22a and 25a formed by storing a filter medium in a mesh bag, and various containers having water permeability. In some cases, the filter medium may be accommodated in the filter medium, or may be configured as a simple aggregate of filter medium without being accommodated in the bag or the container.

(7) In the present invention, setting the filter medium layer on the upper surface of the plate-like support member by its own weight means that the filter medium is accommodated even when the filter medium constituting the filter medium layer has floating properties. This includes the case where the filter medium layer is installed by its own weight.

(8) The upper surface portion 127 of the second filter medium layer 25 is set to be substantially flush with the lower end 85 of the outlet 30, and the upper surface portion 127 is set to a position lower than the lower end 85. Sometimes it is done.

(9) In the embodiment, the first filter medium layer 22 is fixed to the plate-like support member 20 using the binding materials 120 and 120, and the plate-like support member 20 is lifted to thereby The filter medium layer 22 can be lifted at the same time. For example, a first filter medium layer 22 configured by accommodating a small piece of foamed polypropylene in a mesh bag 22a is fixed to the filter cylinder 13, for example, a filter medium exhibiting a net shape. In some cases, the first filter medium layer 22 is supported by the support portion 139, and the first filter medium layer 22 is fixed at a fixed position by preventing the plate-like support member 20 from lifting up. In such a configuration, the first filter medium layer 22 can be replaced by lifting the first filter medium layer 22 after lifting the plate-like support member 20.

(10) As the means for fixing the first filter medium layer 22 to the plate-like support member 20, various known means can be adopted in addition to fixing using the binding material 120 as described above.

(11) For example, as shown in FIG. 15, an opening 141 may be provided at the lower end portion of the side wall 29 of the filtration cylinder 13, and the opening 141 may be used as the water intake portion 17. When comprised in this way, the lower end of the filtration cylinder 13 may be closed.
FIG. 16 shows another embodiment in which the water intake portion 17 is provided on the lower side 16 of the filtration cylinder 13, and the base pieces 142, 142, 142, 142, 142, 142, 142, By placing the lower surface 24 of the filter cylinder 13 on 142, the water intake portion 17 is formed between the adjacent base pieces 142 and 142.

(12) For example, as shown in FIG. 17, the inflow port forming hole 55 and the outflow port forming hole 73 may constitute the inflow port 27 and the outflow port 30.

(13) The inlet 27 may be provided with a downstream end portion of an inflow pipe connected to a ridge or a side groove.

(14) The inflow port 27 and the outflow port 30 are not specified as those provided on the left and right opposing sides 31 and 32.

(15) The vertical bar members 102 and 102 and the handle member 111 constituting the pulling handle 100 may be bent within a range where there is no hindrance.

(16) FIG. 18 shows the amount of inward protrusion (upward) on the upper ends 103, 103 of the vertical bars 102, 102 protruding upward on the opposite side of the outer peripheral edge of the plate-like support member 20. A case is shown in which handle portions 146 and 146 with small protrusions in the direction in which both vertical bars 102 and 102 face each other are provided, and the outer ends of the handle portions 146 and 146 are arranged in the same manner as described above. Engagement protrusions 92 and 92 that can engage with the letter-like engagement grooves 93 and 93 are provided. Even in such a configuration, a relatively large space can be formed between the opposing handle portions 146 and 146, so that the replacement work of the second filter medium layer 25 can be easily performed through the space. .

(17) FIG. 19 shows another embodiment of the L-shaped engagement groove 93. The vertical engagement groove 95 extends obliquely downward from the upper end of the filter cylinder 13, and the vertical engagement groove 95. It is comprised from the horizontal engagement groove | channel 97 extended in the circumferential direction of the said filtration cylinder from the lower end of this.

(18) FIG. 20 shows a case where the upper end portions 103, 103 of the both vertical bars 102, 102 are connected to each other by a handle member 148 in a state where they cannot be attached and detached. In this case, when exchanging the second filter medium layer 25, the second filter medium layer 25 is divided into left and right parts so as to avoid the handle member 111. It is better to make the replacement work as easy as possible.

(19) The configuration in which the plate-like support member 20 is installed at a predetermined position and the plate-like support member 20 can be pulled up is not specified as described above. For example, as shown in FIG. The upper ends 103, 103 of both vertical bars 102, 102 configured in the same manner as described above are attached to the inner peripheral surface 147 of the filter cylinder 13 with a presser member 150 that is detachably fixed with, for example, bolts (not shown). It can also be configured to prevent the plate-like support member 20 from being lifted by pressing from the side. The plate-like support member 20 can be pulled up by removing the presser member 150.

(20) The upper and lower water flow holes 19 provided in the plate-like support member 20 are provided on the upper surface portion 23 as long as they do not hinder the filtration of radioactive substances and the like by the second filter medium layer 25 installed on the upper surface portion 23. It is not always necessary to be provided in an evenly distributed state.
In addition to being provided through the plate-like support member 20, the water flow holes 19 are provided at the upper and lower end open notch grooves formed at the peripheral edge of the plate-like support member 20 and the filter cylinder 13. It may be formed between the inner peripheral surface.

(21) The plate-like support member 20 is constituted by a disc body made of, for example, vinyl chloride. The material may be a resin other than vinyl chloride, or another material.

(22) When the filtration cylinder 13 is placed in an upright state in the outer cylinder 10, the axial lines of the outer cylinder 10 and the filtration cylinder 13 are displaced as described above. The axes may be substantially matched.

(23) The outer cylinder 10 and the filtration cylinder 13 constituting the present invention are not limited to a cylindrical shape, and may be, for example, those having an elliptical cross section. Moreover, you may form in a square etc.

(24) The outer cylinder 10 and the filtration cylinder 13 can be made of resin such as vinyl chloride, or can be configured using a required material such as concrete. In addition, each of these can be configured by stacking a plurality of members in a required number of steps.

(25) The filtration tank 1 according to the present invention may be buried underground as well as being installed on the ground as described above.

(26) In the above embodiment, the overflow port 86 is provided by opening the side wall portion 26 of the filter cylinder 13, but the upper end open portion of the filter cylinder 13 can also be used as an overflow port.

(27) A filter medium layer may be provided for removing contaminants in the water to be treated flowing into the filter cylinder 13 from the overflow port 86.

(28) As treated water containing radioactive substances, radioactive substances that have fallen on the roof of the building are collected together with the rain water, as well as, for example, washing water on the wall of the building, road drainage due to rain, and other radioactive substances The to-be-processed water containing may be sufficient.

(29) Various known attachment / detachment means such as means that can be attached / detached by the engaging means can be adopted as the configuration in which the upper end portions of the rod-like members 102, 102 can be connected to each other by the attachable / detachable handle member 111.

DESCRIPTION OF SYMBOLS 1 Filtration tank 2 Building 3 Roof 5 Water to be treated 6 Ground 7 Upper end open part 9 Cover plate 10 Outer cylinder 11 Upper end 12 Lower end 13 Filtration cylinder 15 Inflow space 16 Lower side 17 Water intake part 18 Filter material layer 19 Water passage hole 20 Plate Support member 21 Lower surface part 22 First filter medium layer 23 Upper surface part 25 Second filter medium layer 27 Inlet 30 Outlet 33 Outlet pipe 42 Bottom 55 Inlet forming hole 56 Inlet pipe 73 Outlet forming hole 86 Overflow port 92 Engagement Joint protrusion 93 L-shaped engagement groove 95 Vertical engagement groove 97 Lateral engagement groove 99 Wide engagement part 100 Handle 102 Vertical bar 110 Half cylinder part 111 Handle member 120 Binder 130 Lower filter medium layer 131 Upper filter media layer 135 Gutter

Claims (6)

A filtration tank constituting member constituting a filtration tank for filtering water to be treated,
A filtration cylinder and a plate-like support member disposed at a required height position in the filtration cylinder and detachable from the filtration cylinder; A hole is provided, and a filter medium layer is provided on the lower surface portion and the upper surface portion of the plate-like support member,
The first filter medium layer provided on the lower surface portion is detachably attached to the lower surface portion, and when the plate-like support member is lifted and taken out to the outside, the first filter medium layer is simultaneously lifted. Further, the second filter medium layer provided on the upper surface portion is installed on the upper surface portion by its own weight and in a state separated from the upper surface portion. 2 filter media layer can be lifted and taken out to the outside,
The lower part of the filtration cylinder has a water intake portion for introducing the water to be treated into the filtration cylinder, and the upper part of the filtration cylinder has the filtered treated water in the filtration cylinder. There is an outlet to discharge to the outside,
Further, the upper surface portion of the plate-like support member is positioned at a position lower than the lower end of the outflow port, and a water pool space is formed above the upper surface portion and below the lower end. A filtration tank constituent member. A plate-like support member is disposed at a required height position in the filter cylinder having a water intake portion on the lower side and an outlet on the upper side, and the plate-like support member can be pulled up and removed from the filter cylinder The plate-like support member is provided with water holes in the vertical direction,
Further, the upper surface portion of the plate-like support member is positioned at a position lower than the lower end of the outlet, and a water reservoir space is formed above the upper surface portion and below the lower end, The filter medium layer is provided on the lower surface portion and the upper surface portion of the plate-like support member,
The first filter medium layer provided on the lower surface portion is detachably attached to the lower surface portion, and when the plate-like support member is lifted and taken out to the outside, the first filter medium layer is simultaneously lifted. The second filter medium layer provided on the upper surface is disposed on the upper surface by its own weight and separated from the upper surface, and the second filter medium layer Can be lifted and removed to the outside,
The water to be treated introduced and raised from the water intake portion into the filtration cylinder is accumulated in the water reservoir space so that a water reservoir portion is formed, and the water to be treated is installed in the water reservoir portion. A filtration tank, wherein the treated water filtered and filtered by the filter medium layer is discharged to the outside of the filter cylinder through the outlet. A plate-like support member is disposed at a required height position in the filter cylinder having a water intake portion on the lower side and an outlet on the upper side, and the plate-like support member can be pulled up and removed from the filter cylinder The plate-like support member is provided with water holes in the vertical direction,
Further, the upper surface portion of the plate-like support member is positioned at a position lower than the lower end of the outlet, and a water reservoir space is formed above the upper surface portion and below the lower end, The filter medium layer is provided on the lower surface portion and the upper surface portion of the plate-like support member,
The first filter medium layer provided on the lower surface portion is detachably attached to the lower surface portion, and when the plate-like support member is lifted and taken out to the outside, the first filter medium layer is simultaneously lifted. The second filter medium layer provided on the upper surface is disposed on the upper surface by its own weight and separated from the upper surface, and the second filter medium layer Can be lifted and removed to the outside,
The second filter medium layer installed on the upper surface portion is composed of a lower filter medium layer existing below the lower end of the outlet and an upper filter medium layer existing above the lower end,
The water to be treated introduced and raised from the water intake portion into the filtration cylinder is accumulated in the water reservoir space so that a water reservoir portion is formed, and the water to be treated is installed in the water reservoir portion. A filtration tank, wherein the treated water filtered and filtered by the filter medium layer is discharged to the outside of the filter cylinder through the outlet. An inflow space is provided between the outer cylinder having a bottom and an upper end openable portion that can be closed by a cover plate, and the filtration cylinder having the upper end opened in a standing state in the outer cylinder. Provided,
The side wall portion of the outer cylindrical body is provided with an inflow port through which water to be treated is introduced, and the side wall portion of the filtering cylinder body is provided with treated water filtered in the filtering cylinder body outside the outer cylindrical body. There is an outlet to discharge
Further, a water intake portion for introducing the treated water that has flowed into the inflow space from the inlet into the filtration cylinder is provided on the lower side of the filtration cylinder,
Further, a plate-like support member is disposed at a required height position in the filtration cylinder, and the plate-like support member can be pulled up and removed from the filtration cylinder, and the plate-like support member has a vertical direction. There is a water vent in the
Further, the upper surface portion of the plate-like support member is positioned at a position lower than the lower end of the outlet, and a water reservoir space is formed above the upper surface portion and below the lower end, The water to be treated introduced and raised from the water intake portion into the filtration cylinder is accumulated in the water reservoir space so that a water reservoir portion is formed, and the water to be treated is installed in the water reservoir portion. The filtered water is filtered through the filter medium layer, and the filtered treated water is discharged to the outside of the outer cylinder through the outlet, and the filter medium layer is provided on the lower surface portion and the upper surface portion of the plate-like support member. Provided,
The first filter medium layer provided on the lower surface portion is detachably attached to the lower surface portion, and when the plate-like support member is lifted and taken out to the outside, the first filter medium layer is simultaneously lifted. The second filter medium layer provided on the upper surface is disposed on the upper surface by its own weight and separated from the upper surface, and the second filter medium layer A filtration tank that can be lifted up and taken out to the outside. The treated water contains a radioactive substance,
The first filter material layer provided on the lower surface portion is configured as a filter material bag in which a piece of foamed polypropylene is accommodated in a mesh bag, and the filter material bag is detachably attached to the lower surface portion. The first filter medium layer is lifted simultaneously when the plate-like support member is lifted and taken out to the outside, and the second filter medium layer provided on the upper surface is granular. Is formed as a filter medium bag in which the zeolite is contained in a mesh bag, and the filter medium bag is installed on the upper surface of the plate-like support member in a state separated from the upper surface, and the filter bag is lifted The filtration tank according to claim 2, wherein the filtration tank can be taken out to the outside. Claim wherein the water to be treated, the radioactive substance drops the roof of a building are thus collected along with rain water, which contains a radioactive substance, also, that the outer tubular member is characterized in that it is installed on the ground 5. The filtration tank according to 5 .

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