JP2012072598A - Rainwater disposal facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rainwater disposal facility capable of almost completely blocking inflow of suspended matters in rainwater into a penetration tank 10 even while a configuration as a device is extremely simple.SOLUTION: The rainwater disposal facility A includes: the penetration tank 10 covered with a water-permeable sheet 11; an inflow basin 20 for making the rainwater flow into the penetration tank 10; and a water conveyance member 30. For the inflow basin 20, an opening 22 is formed at the upper position, and the water conveyance member 30 is extended from there. The water conveyance member 30 includes a water-permeable water passing part at least partially, and a filter material 31 of a permeability coefficient smaller than that of the water-permeable sheet 11 is disposed there.

Description

  The present invention relates to a rainwater treatment facility that can prevent rainwater from flooding roads and flooding small and medium-sized rivers or sewer pipes by temporarily storing rainwater during a large amount of rainfall.

  When there is a large amount of rainfall, it is possible to prevent rainwater from flowing into the road etc. through the road gutter, and to prevent rainwater of a scale exceeding its drainage capacity from flowing into small and medium rivers or sewer pipes. For the purpose, a rainwater treatment facility in which a part of rainwater is temporarily allowed to flow from a catchment basin into an infiltration tank installed in the ground is well known as described in Patent Document 1 or 2.

  In such rainwater treatment facilities, when a large amount of rainwater flows in at once, the earth and sand contained in rainwater easily flows into the infiltration tank. Therefore, in rainwater treatment facilities, one problem is to prevent sediment and suspended matter from flowing into the infiltration tank.

  In order to cope with the problem, Patent Document 3 describes that when introducing rainwater into an infiltration tank or the like for storing rainwater, it is introduced into the infiltration tank or the like of earth and sand contained in rainwater by introducing it through an infiltration pipe. A tank with an osmotic tube adapted to prevent inflow is described. Moreover, in patent document 4, the filtration wall formed with the porous concrete was attached to the some water flow opening formed in the side surface of the hard tank made from concrete from the inside of the hard tank, and it entered into the water storage space of the hard tank. When rainwater flows into the water storage space of the seepage tank through the water passage opening, intruders mixed in the rainwater can be filtered through the filtration wall, and rainwater treatment prevents the infiltration of earth and sand into the seepage tank. The facility is listed.

JP 2009-2160 A JP 2009-24447 A JP 2002-266414 A JP 2008-253977 A

  In the rainwater treatment facility as described above, by adopting the technique described in Patent Document 3 or Patent Document 4, solid materials such as earth and sand can be prevented from entering the infiltration tank to some extent, but completely. However, it is not easy to prevent the entry of a suspension having a small particle size. In particular, as described in Patent Document 1, Patent Document 2 or Patent Document 3, a large number of resin members are assembled into a water tank main body, and the whole is covered with a water-permeable sheet such as a nonwoven fabric to form a permeation tank. In this case, since each water storage space formed by the laminated resin members is narrow, it is difficult to remove earth and sand and suspension when it enters the infiltration tank. The clogging of the adhesive sheet is caused, and the ability of rainwater to flow out of the infiltration tank, that is, the infiltration ability is reduced.

  Like the water treatment apparatus described in Patent Document 4, by attaching a filtration wall formed of porous concrete to a water passage opening formed on the side surface of a concrete hard tank, earth and sand mixed in rainwater, etc. Although it is considered that solid matter can be prevented from flowing into the infiltration tank with a high probability, the construction of the apparatus is complicated and it cannot be said that construction is easy. In addition, when a suspension having a small particle size is mixed in rainwater, it may pass through porous concrete and flow into the infiltration tank. Furthermore, in the water treatment apparatus described in Patent Literature 4, when a large amount of rainwater exceeding the height of the filtration wall enters the hard tank, the rainwater directly enters the permeation tank from the gap of the water flow opening at the top of the filtration wall. In such a case, earth and sand in rainwater will flow into the infiltration tank.

  The present invention has been made in view of the circumstances as described above, and is capable of almost completely preventing the suspension of rainwater from flowing into the permeation tank while having a very simple configuration as a device. Therefore, it is an object of the present invention to provide a rainwater treatment facility that does not cause a decrease in the effective volume of the infiltration tank and does not cause a decrease in the ability of rainwater to permeate the surrounding ground from the infiltration tank.

  The rainwater treatment facility according to the present invention is a rainwater treatment facility comprising at least an infiltration tank covered with a water permeable sheet and an inflow trough for allowing rainwater to flow into the infiltration tank, and the inflow trough is formed at an upper position thereof. A water guide member connected to the opening, wherein the water guide member is connected to any one of the ceiling part, the interior part, the side part or the bottom part of the permeation tank through the water passage part, and at least the water guide member A filter material is disposed in the water passage portion.

  In the rainwater treatment facility described above, the rainwater flowing through the road gutter etc. is once collected in the inflow trough and then flows into the infiltration tank. An opening is formed at the upper position of the inflow rod, and flows into the water guide member from the opening at the upper position. Therefore, the rainwater flowing into the water guide member becomes rainwater after the solid matter such as earth and sand is sunk at the bottom of the inflow trough, that is, the supernatant liquid. However, in the supernatant liquid, solids are not completely removed, and there is a high possibility that a suspension having a small particle size is included.

  In the rainwater treatment facility according to the present invention, the water conveyance member is connected to any one of the ceiling portion, the inside, the side portion, or the bottom portion of the infiltration tank through the water flow portion, and at least to the water flow portion of the water conveyance member. Since the filter material is arranged, even if the rainwater flowing into the water guide member from the inflow trough contains a suspension having a small particle diameter, it is a filter disposed at least in the water flow portion of the water guide member. Removed by the material. As a result, the suspension can be almost completely prevented from entering the permeation tank. As a result, clogging of the water permeable sheet covering the permeation tank can be avoided over a long period of time, and even in rainwater treatment facilities where maintenance is not performed or difficult to perform, the permeation tank Therefore, it is possible to avoid the ability of rainwater to permeate the surrounding ground, that is, to prevent the permeation ability from decreasing.

  In the rainwater treatment facility according to the present invention, the permeation tank itself may be a conventionally known one as described in, for example, Patent Document 4, and in the construction, an appropriate place between the inflow tank and the permeation tank. Since the water guide member described above may be disposed together with the filter material, the construction is easy.

  In a preferred embodiment of the rainwater treatment facility according to the present invention, the water permeability coefficient of the filter material disposed in at least the water flow portion of the water conveyance member is equal to or smaller than the water permeability coefficient of the water permeable sheet covering the permeation tank. It is characterized by. Here, the water permeability coefficient refers to the amount of water that moves a unit area per unit time.

  In this aspect, even when the suspended matter flows into the permeation tank through the filter material disposed in at least the water passage portion of the water guide member, the suspension is a water-permeable sheet that covers the permeation tank. Since it passes through the tank and is discharged out of the tank, that is, penetrates into the surrounding ground, it is possible to more reliably avoid the suspension of rainwater in the infiltration tank as sediment. .

  In a preferred embodiment of the rainwater treatment facility according to the present invention, the permeation amount per unit time of rainwater from the permeation tank to the surrounding ground is from the filter material disposed in the water flow portion of the water conveyance member to the permeation tank. The water permeability of the filter material is set so as to be equal to or greater than the water permeability per unit time. Here, the “permeation amount of rainwater from the infiltration tank to the surrounding ground per unit time” is a value calculated from the product of the permeability coefficient of the surrounding ground and the surface area of the infiltration tank, The “permeation amount per unit time” is a value calculated from the product of the permeability coefficient of the filter material and the effective area of the filter material. The “effective area of the filter material” is an area excluding the area of the filter material from which the rainwater that has passed does not flow into the permeation tank from the entire area of the filter material through which the rainwater has passed.

  In general, the amount of rainwater infiltrated from an infiltration tank buried in the ground depends on the infiltration capacity of the surrounding ground, but in this aspect, as described above, “permeation per unit time from the filter material to the infiltration tank By setting the “amount”, it is possible to avoid a situation in which the filter material becomes a barrier against rainwater and rainwater is not stored in the permeation tank.

  In a preferred aspect of the rainwater treatment facility according to the present invention, the inflow trough is a seepage trough. By making the inflow trough a seepage trough, the outflow suppression process for a larger amount of rainwater becomes possible.

  In a preferred embodiment of the rainwater treatment facility according to the present invention, the filter material disposed at least in the water passage portion of the water conveyance member is replaceable. In this aspect, when the filter material is clogged, replacement with a new filter material facilitates long-term maintenance of the outflow suppression process.

  In the rainwater treatment facility according to the present invention, the above-described water guide member can be made of an appropriate material on condition that the required mechanical strength is provided. Examples include water-permeable concrete, resin materials and metal materials having holes and slits, concrete secondary products, and the like. Moreover, the filter material can use suitably the material which has water permeability and can capture | acquire microparticles | fine-particles like a suspension. Examples include nonwoven fabrics, woven fabrics, and foamed resin sheets having continuous air bubbles.

  According to the present invention, the structure of the apparatus is extremely simple, but it is possible to almost completely prevent the suspension of rainwater from flowing into the permeation tank, thereby making maintenance difficult. Even so, it is possible to obtain a rainwater treatment facility capable of maintaining the ability of rainwater to permeate the surrounding ground from the infiltration tank for a long period of time.

BRIEF DESCRIPTION OF THE DRAWINGS Schematic which shows one Embodiment of the rainwater treatment facility by this invention in a cross section. The enlarged view of the cross section which follows the II-II line | wire of FIG. The figure equivalent to FIG. 2 for demonstrating other embodiment of the rainwater treatment facility by this invention. The figure corresponded in FIG. 2 for demonstrating other embodiment of the rainwater treatment facility by this invention. The figure equivalent to FIG. 1 for demonstrating other embodiment of the rainwater treatment facility by this invention. The figure equivalent to FIG. 1 for demonstrating other embodiment of the rainwater treatment facility by this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The rainwater treatment facility A shown in FIGS. 1 and 2 includes a permeation tank 10 covered with a water permeable sheet 11, an inflow trough 20 for flowing rainwater into the permeation tank 10, and rainwater from the inflow trough 20 to the permeation tank. 10 and a water guide member 30 to be introduced into the vehicle.

  The permeation tank 10 is formed by assembling a large number of resin members 12 as described in Patent Document 2, for example, into a rectangular parallelepiped shape, and the entire outer peripheral surface thereof is covered with a water-permeable sheet 11 such as a nonwoven fabric. It has been broken. In the construction, the foundation 13 is formed by spreading permeable concrete or crushed stone on the bottom of the excavated part excavated to a required depth, and the infiltration tank 10 is formed thereon. In this example, a concrete floor slab 14 is disposed on the permeation tank 10 for the purpose of averaging the loading load, and a pile is placed thereon. The concrete floor slab 14 may be omitted.

  The inflow trough 20 is installed so as to contact the end face side of the permeation tank 10. In this example, the inflow trough 20 is made of permeable concrete, and is a cylindrical body having a rectangular cross section as a whole, and its bottom surface is open. Further, the upper surface of the inflow tub 20 reaches the ground surface, and a management port 24 is formed on the upper surface. The position of the lower end of the inflow trough 20 that is open is the same level as the bottom surface of the infiltration tank 10, and the foundation 13 extends to the lower end of the inflow trough 20 open by laying the permeable concrete or crushed stone. Has reached. The lower end position of the inflow tub 20 may extend downward from the bottom surface of the infiltration tank 10.

  A rectangular opening 22 is formed at the upper portion of the side wall 21 that is in contact with the end face of the infiltration tank 10 and is a side wall of the inflow tank 20. Further, on the other side wall of the inlet 20, a rainwater inlet 23 from a side groove or the like is formed at a position higher than the opening 22. The horizontal width of the opening 22 is narrower than the horizontal width of the permeation tank 10 and the vertical width is also narrower than the vertical width of the permeation tank 10. In the illustrated one, the width of the opening 22 is about 1/4 of the width of the permeation tank 10, and the vertical width is about 3 to 4 of the laminated resin members 12. The opening 22 is formed at or near the center of the infiltration tank 10 embedded in the ground in the lateral direction so that the upper end of the opening substantially coincides with the upper surface 15 (see FIG. 2) of the infiltration tank 10. ing.

  The water guide member 30 is a long member. In this example, the water guide member 30 is a tubular member having a rectangular cross section made of water permeable concrete, and the whole water guide member 30 has water permeability. The cross-sectional shape and size of the water guide member 30 are substantially the same shape and size as the rectangular opening 22 formed in the side wall 21 of the inflow rod 20, and the opening of the inflow rod 20 is open at one end thereof. 22 is contacted. The other end face of the water guide member 30 is closed. The length of the water guide member 30 is not limited to the condition that it extends at least into the permeation tank 10, but in the example shown in the drawing, the length reaches from the one end to the other end of the permeation tank 10.

  Then, as shown in the figure, the resin member 12 is removed in a shape that substantially matches the cross-sectional shape of the opening 22 in a region facing the opening 22 formed in the side wall 21 of the inflow tank 20 of the infiltration tank 10. Thus, the groove 16 is open at the top, and the water guiding member 30 enters the groove 16. As described above, in this example, the water guide member 30 has water permeability as a whole, and the three side surfaces excluding the top surface thereof face the inside of the permeation tank 10. The entire member 30 constitutes a “water passage portion” for the permeation tank 10.

  A sheet-like filter material 31 made of a material such as a non-woven fabric (for example, Avile AN400B manufactured by Unitika Co., Ltd.) is disposed on the inner surface of the water guide member 30 thus installed. Preferably, a material having a water permeability smaller than or equal to the water permeability of the water permeable sheet 11 covering the permeation tank 10 is selected as the material of the filter material 31, and the surrounding ground from the entire circumferential surface of the permeation tank 10. Adjusting the effective area of the filter material 31 so that the amount of permeation of rainwater per unit time into the permeation tank 10 from the total area of the filter material 31 is equal to or greater than the amount of water per unit time, Water permeability is set.

  The effect | action at the time of the water collection of the said rainwater treatment facility A is demonstrated. Rainwater from a side groove or the like (not shown) flows into the inflow rod 20 from an inlet 23 formed in the inflow rod 20. The inflowing rainwater penetrates into the ground from the open bottom surface of the inflow rod 20. Moreover, it permeates into the ground from the surrounding side walls which are permeable concrete. When an amount of rainwater that cannot be treated by the inflow trough 20 flows into the inflow trough 20, the rainwater level in the inflow trough 20 gradually increases. When the water level reaches the level of the opening 22, the rainwater flows into the water guide member 30 through the opening 22, and then flows into the infiltration tank 10 after being filtered by the filter material 31. By flowing rainwater into the infiltration tank 10, it is possible to avoid rainwater flowing out to the road surface or the like.

  The rainwater that has flowed into the inflow rod 20 temporarily stays in the inflow rod 20 before flowing into the water guide member 30. In the meantime, solid matter such as earth and sand contained in the rainwater is deposited on the bottom of the inflow trough 20 in the process of rainwater penetrating into the ground from the open bottom of the inflow trough 20. Then, the supernatant liquid after the solid matter is precipitated flows into the water guide member 30 through the opening 22. The rainwater that has flowed into the water guide member 30 is further filtered by the filter material 31 mounted in the water guide member 30 to remove finer solids floating in the rainwater such as suspensions. Is done.

  From the above, in the rainwater treatment facility according to the present invention, solid matter such as earth and sand and suspended matter contained in the rainwater flowing into the inflow trough 20 can be prevented with a high probability. It becomes possible. Therefore, the maintenance work of the permeation tank 10 can be greatly reduced. Further, as a result, the water-permeable sheet 11 covering the permeation tank 10 can be prevented from being clogged for a long period of time, and is a rainwater treatment facility A that does not perform maintenance or is difficult to perform. In addition, it is possible to avoid over a long period of time that the ability of rainwater to permeate the surrounding ground from the infiltration tank 10, that is, the reduction of the infiltration capacity, is reduced.

  Further, by making the water permeability coefficient of the filter material 31 equal to or smaller than the water permeability coefficient of the water permeable sheet 11 covering the permeation tank 10, the suspended matter flows into the permeation tank 10 through the filter material 31. Even if the suspension has passed, the suspension passes through the water-permeable sheet 11 covering the permeation tank 10 and is easily discharged out of the tank and permeates into the surrounding ground. Thereby, it can avoid more reliably that the suspension in rainwater will stay in the infiltration tank 10 as a deposit.

  Further, the permeation amount of the filter material 31 is set so that the permeation amount per unit time from the permeation tank 10 to the surrounding ground is equal to or greater than the permeation amount per unit time from the filter material 31 to the permeation tank 10. By doing so, it is possible to reliably avoid a situation in which the filter material 31 becomes a barrier against rainwater and rainwater is not stored in the permeation tank 10.

  FIG. 3A is a view corresponding to FIG. 2 showing the shapes of the infiltration tank 10 and the water guide member 30 in another aspect of the rainwater treatment facility according to the present invention. The same symbols are attached to the same members. Here, the water guide member 30 is not a tubular member, but has a U-shaped side groove shape, and the lower side of the water guide member 30 enters the infiltration tank 10. In this aspect, the portion of the U-shaped side groove that has entered the infiltration tank 10 constitutes the “water passage portion” referred to in the present invention. However, in this aspect, the filter material 31 is mounted so as to cover the entire inner surface of the U-shaped side groove, not limited to the water passage portion. The upper end of the water guide member 30 is located on the ground surface, and a lid 32 is provided there. In this aspect, since the upper part of the water guide member 30 can be freely opened, the replacement work of the filter material 31 when the filter material 31 is clogged becomes extremely easy.

  FIG. 3B is a view corresponding to FIG. 2 showing still another embodiment. Here, the water guide member 30 that also has the shape of a U-shaped side groove is formed on the ceiling surface of the permeation tank 10 as it is. In this aspect, rainwater that permeates from the U-shaped side gutter having water permeability enters the permeation tank 10 directly or through the surrounding ground. Part ”. Moreover, in this aspect, since it is not necessary to provide the perforation tank 10 with the above-described concave groove 16 opened upward, the permeation tank 10 can be easily constructed.

  FIG.3 (c) is a figure equivalent to FIG. 2 which shows another aspect. Here, it differs from the form shown in FIG.3 (b) by the point which installed the concrete floor slab 14 between the penetration tank 10 and the water guide member 30 which makes the shape of a U-shaped side groove. In this case, it is necessary to provide water permeability to at least a region in contact with the water guide member 30 of the concrete slab 14 or to form a large number of water permeability holes. Even in this aspect, it can be said that the entire U-shaped side groove constitutes the “water flow portion” in the present invention.

  Fig.4 (a) is a figure equivalent to FIG. 2 which shows another aspect. Here, it differs from what was shown in FIG. 2 by the point which has arrange | positioned the filter material 31 not the inner peripheral surface of the water conveyance member 30, but the outer peripheral surface side. In this aspect, there is an advantage that the same material as the water permeable sheet 11 covering the permeation tank 10 can be used as the filter material 31. However, in order to obtain a higher effect, it is desirable to use a sheet having a smaller water permeability coefficient than the water-permeable sheet 11 covering the permeation tank 10.

  FIG. 4B is a view corresponding to FIG. 2 showing still another embodiment. This aspect is different from the aspect shown in FIG. 3A in that the filter material 31 is disposed not on the inner peripheral surface of the water guide member 30 but on the outer peripheral surface side. In this aspect, there is an advantage that the filter material 31 can be replaced only by removing the water guide member 30.

  FIG. 4 (c) is a view corresponding to FIG. 2 showing still another aspect. In this aspect, the water guide member 30 is arranged so that the upper surface side thereof is in contact with the bottom surface of the permeation tank 10. It is installed below. And the filter material 31 is arrange | positioned so that the whole internal peripheral surface of the water guide member 30 may be covered. In this aspect, the supernatant liquid overflowing from the opening 22 of the catchment basin 20 flows into the water guide member 30 and passes through the top surface when the inflowed water exceeds the allowable water amount of the water guide member 30. It will enter into the infiltration tank 10. Therefore, in this aspect, the “water flow portion” referred to in the present invention can be said to correspond to the top surface portion of the water guide member 30, but here, as described above, it covers the entire inner peripheral surface of the water guide member 30. A filter material 31 is provided. Moreover, the water guide member 30 may be a U-shaped side groove provided with water permeability as illustrated.

  FIGS. 5 (a), 5 (b), 6 (a), and 6 (b) are views corresponding to FIG. 1, showing still another aspect of the rainwater treatment facility according to the present invention. 5A, 5B, and 6A, 6B, members corresponding to those shown in FIG. 1 are denoted by the same reference numerals.

  In the embodiment shown in FIG. 5 (a), a water guide member 30 having a box shape is formed along the side wall 21 in which the opening 22 of the water collecting basin 20 is formed, and the water guide having the box shape is formed. One side wall 35 of the member 30 is in contact with the end surface of the permeation tank 10. An opening 36 is formed in the side wall 35 of the water guide member 30 at a position facing the upper region of the infiltration tank 10, and rainwater in the water guide member 30 flows into the infiltration tank 10 through the opening 36. Therefore, in this embodiment, the opening 36 corresponds to a “water passage portion” in the present invention.

  Further, an appropriate protrusion 37 is provided at an upper position of the opening 36, and the filter material 31 is disposed so as to cover a region below the protrusion 37 by using the protrusion 37. Further, a water guide pipe 38 is attached with the discharge port facing downward from the opening 22 of the water collecting basin 20 toward the internal space of the water guide member 30. Furthermore, the upper end of the water guide member 30 reaches the ground surface and serves as a management port 39.

  In this aspect, since the permeation tank in the conventional rainwater treatment facility can be used as it is as the permeation tank 10, the construction of the permeation tank 10 is simplified. In addition, from the management port 39, maintenance in the water guiding member 30 and inspection and replacement work of the filter material 31 are facilitated. In the illustrated example, the protrusion 37 is provided and the filter material 31 is attached using the protrusion 37. However, the filter material 31 is attached to the wall portion of the water guide member 30 by bolts or the like using an appropriate attachment plate. It can also be fixed directly. The water guide member 30 may be made of water permeable concrete so that the entire water guide member 30 has water permeability.

  The mode shown in FIG. 5B is different from that shown in FIG. 5A in that the water collecting basin 20 and the water guide member 30 are provided separately. In this aspect, the water collecting basin 30 and the water guiding member 30 are connected by the pipe line 40, and the degree of freedom of the installation position of the water collecting basin 20 and the water guiding member 30 is increased.

  In the embodiment shown in FIG. 6A, the filter material 31 is attached so as to be suspended from the ceiling portion of the water guide member 30, and the above-described water guide pipe 38 penetrates the filter material 31 and the discharge port is connected to the filter material 31. Open to the inside. Further, the filter material 31 has a large surface area by providing many pleats 41 inside.

  In this embodiment, since the surface area of the filter material 31 can be secured large, even if the volume of the water guide member 30 is smaller than that of FIG. There is an advantage that a large amount of rainwater can be allowed to flow into the permeation tank 10 in a state where the water is sufficiently filtered.

  The mode shown in FIG. 6B is different from that shown in FIG. 6A in that the bag-shaped filter material 31 is attached so as to be suspended from the ceiling of the water guide member 30. Because of the bag shape, the attachment work and the exchange work of the filter material 31 are extremely easy.

A ... Rainwater treatment facility,
10 ... Osmosis tank,
11 ... water-permeable sheet,
12 ... Resin member constituting the permeation tank,
13 ... Basics,
14: Concrete floor slab,
15 ... the top surface of the infiltration tank,
20 ... Inflow trough,
21 ... Side wall of the inflow trough,
22: an opening formed in the side wall,
23 ... Inflow of rainwater,
30 ... Permeable water guide member,
31 ... Filter material.

Claims (5)

  A rainwater treatment facility comprising at least a permeation tank covered with a water permeable sheet and an inflow trough for allowing rainwater to flow into the permeation tank, wherein the inflow trough is connected to an opening formed at an upper position thereof The water guide member is connected to any one of the ceiling part, the inside, the side part, or the bottom part of the infiltration tank through a water passage part, and at least the water passage part of the water guide member has a filter material. A rainwater treatment facility characterized in that is disposed.   The rainwater treatment facility according to claim 1, wherein a water permeability coefficient of a filter material disposed on the water conveyance member is equal to or smaller than a water permeability coefficient of a water permeable sheet covering the permeation tank.   The permeation amount per unit time of rainwater from the permeation tank to the surrounding ground is equal to or greater than the permeation amount per unit time from the filter material disposed in the water flow part of the water guide member to the permeation tank. The rainwater treatment facility according to claim 1 or 2, wherein a water permeability of the filter material is set.   The rainwater treatment facility according to any one of claims 1 to 3, wherein the inflow trough is a seepage trough.   The rainwater treatment facility according to any one of claims 1 to 4, wherein the filter material disposed on the water guide member is replaceable.

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