Sewage treatment device, sewage treatment system, and method of constructing sewage treatment system

Abstract

To provide a sewage treatment device and a sewage treatment system, capable of exhibiting a stable treatment capacity, and a method of constructing the sewage treatment system.SOLUTION: The sewage treatment device comprises: a pit member 2 which is formed into a cylindrical shape by combining a plurality of panel members 10, and in which a storage section 30 for storing a sewage treatment floor 5 is formed; a waterproof sheet 50 which prevents rainwater from entering the storage section of the pit member 2; and a lid member 4 which covers an upper part of the pit member 2.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to a wastewater treatment device, a wastewater treatment system, and a method for constructing a wastewater treatment system. [Background technology]

[0002] Sewage treatment devices that use earthworm compost to treat wastewater are known for toilets installed in areas lacking infrastructure such as water and sewerage systems. For example, Patent Document 1 discloses a toilet system in which toilet wastewater is stored in a tank equipped with a treatment bed and a drainage bed containing earthworms, and the wastewater is purified and returned to the ground after passing through the treatment bed and drainage bed containing earthworms. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2018 / 225082 Summary of the Invention [Problem to be solved by the invention]

[0004] When the tank of the sewage treatment device is constructed by connecting multiple parts, there is a risk that rainwater will penetrate into the tank through the joints between the parts via the surrounding soil during rainfall. If a large amount of rainwater penetrates into the tank, the treatment bed where the earthworms live will become flooded, causing the earthworms to drown, and the desired treatment capacity may not be achieved.

[0005] The present disclosure has been made in consideration of the above circumstances, and aims to provide a sewage treatment device, a sewage treatment system, and a construction method for a sewage treatment system that can exhibit stable treatment capacity. [Means for solving the problem]

[0006] A sewage treatment device according to one aspect of the present disclosure comprises a pit member formed into a cylindrical shape by combining a plurality of panel members, a waterproof sheet that prevents rainwater from entering the inside of the pit member, and a lid member that covers the top of the pit member. [Brief explanation of the drawings]

[0007] [Figure 1] 1 is a schematic diagram of a wastewater treatment system according to an embodiment of the present invention. [Figure 2] 1 is a partial cross-sectional perspective view of a wastewater treatment device according to an embodiment of the present invention. [Figure 3] 1 is a vertical cross-sectional view of a wastewater treatment device according to an embodiment of the present invention. [Figure 4] FIG. 1 shows a construction method for a sewage treatment device. [Figure 5] FIG. 2 shows the construction method of the sewage treatment device. [Figure 6] FIG. 3 shows the construction method of the sewage treatment device. [Figure 7] FIG. 1 is a perspective view of a prefabricated structural component. [Figure 8] FIG. 10 is a vertical cross-sectional view of a modified example of the sewage treatment device of the present embodiment. [Figure 9] FIG. 10 is a partial cross-sectional perspective view of a modified example of the sewage treatment device of the present embodiment. [Figure 10] FIG. 4 shows the construction method of the sewage treatment device. [Figure 11] FIG. 2 is a diagram showing the sewage treatment device in a housed state before assembly. [Figure 12] FIG. 5 shows the construction method of the sewage treatment device. [Figure 13] FIG. 6 shows the construction method of the sewage treatment device. [Figure 14] FIG. 7 shows the construction method of the sewage treatment device. [Figure 15] FIG. 8 shows the construction method of the sewage treatment device. [Figure 16] FIG. 9 shows the construction method of the sewage treatment device. DETAILED DESCRIPTION OF THE INVENTION

[0008] Hereinafter, with reference to the drawings, an embodiment of a sewage treatment device 1 and a sewage treatment system 100 will be described. As shown in Fig. 1, the sewage treatment system 100 includes a toilet 101, a sewage treatment device 1, a drain pipe 102, a treatment floor 5, and a drainage floor 6.

[0009] The sewage treatment device 1 includes a pit member 2 having a storage section 30 formed therein that stores a treatment bed 5 and a drainage bed 6, and a lid member 4 that covers the upper end of the pit member 2. A toilet 101 and the sewage treatment device 1 are connected by a drainage pipe 102. Excrement from the toilet 101 is transported through the drainage pipe 102 into the pit member 2 of the sewage treatment device 1. The pit member 2 contains a treatment bed 5. The treatment bed 5 is constructed by placing earthworms in organic matter such as straw or soil. The treatment bed 5 biodegrades the excrement within the pit member 2, and the decomposed products are returned to the ground. The treatment bed 5 is an example of a sewage treatment bed.

[0010] The toilet 101 is provided in a toilet room 103 built above ground. The toilet 101 is a known toilet. The toilet 101 may have a counterbalance structure at the outlet of the toilet bowl, such that the outlet is closed with a lid in an unloaded state and the lid of the outlet opens due to the weight of the excrement, as in the simple toilet described in U.S. Patent Application Publication WO2015013699A3.

[0011] The drain pipe 102 is a known drain pipe provided between the drain outlet of the toilet 101 and the sewage treatment device 1. In the illustrated example, the drain pipe 102 is buried underground, but the drain pipe 102 may also be disposed above ground.

[0012] The sewage treatment device 1 includes a pit member 2 and a cover member 4. The sewage treatment device 1 is placed in a hole H dug in the ground.

[0013] The pit member 2 houses a treatment bed 5 and a drainage bed 6 inside. As shown in FIG. 2, the pit member 2 has a cylindrical shape with an upper end 22 and a lower end 28 open. The pit member 2 is placed inside a hole H. The pit member 2 functions as a partition wall between the hole H and the pit member 2. In the illustrated example, a plurality of through holes 24 are formed in the side wall 21 of the pit member 2. The through holes 24 do not have to be formed. An opening 23 into which a drainage pipe 102 is inserted is formed near the upper end 22 of the pit member 2. The pit member 2 is made up of, for example, a plurality of prefabricated structural components 10, and has a prefabricated structure in which each component is assembled at the construction site.

[0014] As shown in FIG. 7, the prefabricated structural component 10 is a curved plate-like component. Multiple prefabricated structural components 10 can be connected horizontally to form a cylinder. Multiple prefabricated structural components 10 can be connected vertically to set the height of the cylinder as desired. A plurality of engaging claws 11 and engaging recesses 12 are formed on the periphery of the prefabricated structural component 10 to connect adjacent prefabricated structural components 10, 10. Adjacent prefabricated structural components 10 are connected by fitting the engaging claw 11 of one prefabricated structural component 10 into the engaging recess 12 of the other prefabricated structural component 10. The pit component 2 may be, for example, an integrally molded component. The pit component 2 may be made of, for example, resin, metal, or concrete.

[0015] As shown in Figures 2 and 3, the sewage treatment device 1 further includes a waterproof sheet 50. The waterproof sheet 50 covers the entire outer peripheral surface 26 of the pit member 2 on the outside of the pit member 2. The waterproof sheet 50 is formed, for example, from a polyethylene film, and is a vinyl tube formed into a cylindrical shape so as to cover the pit member 2 from the outside. When the waterproof sheet 50 is placed on the outside of the pit member 2, the waterproof sheet 50 is sized so that it is taller than the pit member 2. The upper end 51 of the waterproof sheet 50 is folded inward so as to wrap around the upper end 22 of the pit member 2.

[0016] A treatment bed 5 and a drainage bed 6 are provided within the storage section 30 of the pit member 2. The drainage bed 6 is provided on the bottom 31 of the hole H, and the treatment bed 5 is provided on the drainage bed 6. The drainage bed 6 is, for example, granular material such as gravel, and forms a permeable layer for liquids and gases between the bottom 31 and the treatment bed 5. The excrement supplied to the treatment bed 5 of the pit member 2 is decomposed in the treatment bed 5. Of the substances that are decomposed and rendered harmless by the excrement, the water passes through the drainage bed 6 and seeps into the ground.

[0017] The sewage treatment device 1 further includes a cover member 4. The cover member 4 covers the upper part of the pit member 2. The cover member 4 is not particularly limited as long as it is configured to cover the upper part of the pit member 2 in an openable and closable manner. The cover member 4 can be made of an appropriate material, such as resin, concrete, stone, or wood. The cover member 4 is a circular plate-like member. The cover member 4 may be divided into multiple parts or may be formed as a single unit. As shown in FIG. 9, an opening 65 for attaching a toilet bowl 101 may be formed in the cover member 4, and the toilet bowl 101 may be placed directly on the cover member 4 so that excrement falls directly onto the treatment floor 5 in the pit member 2.

[0018] The following describes a method for installing the sewage treatment device 1. As shown in Fig. 10, a hole H is dug in the ground near the toilet room 103. The dimensions of the pit member 2 are, for example, 1200 mm in height. The hole H is dug large enough to allow the entire pit member 2 to be inserted therein.

[0019] As shown in Fig. 11, the sewage treatment device 1 is disassembled and housed in a cardboard box 66. A plurality of prefabricated structural components 10, a waterproof sheet 50, and the like are housed in the cardboard box 66. The cardboard box 66 may also house a disassembled lid member 4. The cardboard box 66 may also house a penetration jig 56, which will be described later.

[0020] The prefabricated structural components 10 are assembled on-site to form the cylindrical pit member 2. The pit member 2 can be easily assembled by simply fitting the engaging claws 11 of the prefabricated structural components 10 into the engaging recesses 12.

[0021] As shown in Figure 12, the pit member 2 is inserted into the hole H. The pit member 2 is made of resin and is lightweight, making it easy to transport and install. The side wall 21 of the pit member 2 is close to the hole wall HW. An opening 23 is formed in the pit member 2 to connect the drain pipe 102. The opening 23 may be formed in advance before assembling the pit member 2, or it may be formed after the pit member 2 is placed in the hole H. The opening 23 is formed using a cutter or the like, taking into account the piping diameter of the drain pipe 102.

[0022] As shown in Figure 13, a cylindrical waterproof sheet 50 is inserted from above the pit member 2 so as to cover the outside of the pit member 2. The waterproof sheet 50 is inserted until it reaches the bottom of the hole H. The waterproof sheet 50 is attached to the pit member 2 by folding the upper end 51 inward to cover the upper end 22 of the pit member 2 and engaging it. It is also possible to attach the waterproof sheet 50 to the pit member 2 on the ground in advance, and then insert the pit member 2 with the waterproof sheet 50 attached into the hole H.

[0023] As shown in Figure 4, a hole 52 for passing the drain pipe 102 is made in the waterproof sheet 50 at a position opposite the opening 23 of the pit member 2. The hole 52 is smaller than the outer diameter of the drain pipe 102. The hole 52 may be made by simply making a cut with a cutter or the like.

[0024] As shown in Figure 14, a pointed penetrating jig 56 is attached to the end 55 of the drainage pipe 102. The penetrating jig 56 is made of resin and has a conical outer shape. The base end 57 of the penetrating jig 56 is attached to the end 55 of the drainage pipe 102. It is desirable that the tip 58 of the penetrating jig 56 be sharp enough to be able to insert it into the hole 52 without difficulty.

[0025] As shown in Figure 5, the drain pipe 102 with the penetration jig 56 attached is inserted into the opening 23 from the outside of the pit member 2. The penetration jig 56 breaks the hole 52 in the waterproof sheet 50, allowing the drain pipe 102 to be guided into the pit member 2. The drain pipe 102 is inserted from the outside of the pit member 2 and attached to the opening 23.

[0026] As shown in Figures 6 and 15, once the drain pipe 102 is attached to the pit member 2, the penetration jig 56 is removed. As the drain pipe 102 is inserted, the vinyl material of the waterproof sheet 50 stretches and is introduced into the inside of the pit member 2 along the outer surface 61 of the drain pipe 102. The waterproof effect can be improved by adhering the waterproof sheet 50, which has stretched into the inside of the pit member 2, to the drain pipe 102 with tape or the like. The waterproof sheet 50 and the drain pipe 102 do not have to be adhered together. The point where the drain pipe 102 is connected to the pit member 2 is called the piping connection part 70.

[0027] 16, after the installation of the drain pipe 102 is completed, the gap between the pit member 2 and the hole wall HW is backfilled with soil. Before installing the drain pipe 102, soil may be backfilled up to just below where the drain pipe 102 will be installed, and the remaining gap may be backfilled after the drain pipe 102 is installed.

[0028] The drainage floor 6 and treatment floor 5 are sequentially accommodated in the accommodation section 30. The drainage pipe 102 protrudes at a downward angle toward the accommodation section 30. With the drainage pipe 102 positioned within the pit member 2, waste can be supplied from the toilet 101 through the drainage pipe 102 into the pit member 2. Finally, the cover member 4 is installed to close the opening 15 at the top end of the pit member 2, thereby completing the installation of the sewage treatment device 1.

[0029] The sewage treatment device 1 and sewage treatment system 100 according to the above embodiment include a pit member 2 formed into a cylindrical shape by combining multiple prefabricated structural components 10 and having a storage section 30 formed therein that houses a treatment bed 5, a waterproof sheet 50 that prevents rainwater from entering the storage section 30 of the pit member 2, and a lid member 4 that covers the top of the pit member 2. This prevents rainwater from entering the inside of the pit member 2 through the joints between the prefabricated structural components 10, 10, and allows for stable treatment capacity without affecting the earthworms living in the treatment bed 5. Because the pit member 2 is made by combining multiple prefabricated structural components 10, it is easy to transport and can be easily installed even in construction locations where it is difficult to access by vehicle, etc.

[0030] Since the waterproof sheet 50 is provided on the outside of the pit member 2, the water pressure of the water seeping into the soil received from the outside of the waterproof sheet 50 during rainfall, etc., can be supported by the pit member 2 arranged inside the waterproof sheet 50.

[0031] Because the waterproof sheet 50 is sized to protrude above the upper end of the pit member 2, the waterproof sheet 50 can be attached so as to cover the upper end 22 of the pit member 2. By attaching the waterproof sheet 50 to the pit member 2 in this way, sinking occurs in the surrounding soil during construction, and when the waterproof sheet 50 slides downward, it is possible to prevent the top end of the waterproof sheet 50 from becoming lower than the top end of the pit member 2.

[0032] The waterproof sheet 50 facing the opening 23 of the pipe connection portion 70 has a hole 52 formed therein through which the drain pipe 102 is inserted. Since the hole 52 is smaller than the outer diameter of the drain pipe 102, when the drain pipe 102 is attached to the pit member 2, the waterproof sheet 50 around the pipe connection portion 70 stretches and adheres closely to the outer surface 61 of the drain pipe 102, thereby preventing rainwater and the like from entering through the pipe connection portion 70.

[0033] The sewage treatment system 100 comprises a sewage treatment device 1 buried underground, a toilet 101 installed above ground, a drain pipe 102 connecting the drain outlet of the toilet 101 to the sewage treatment device 1, and a sewage treatment bed 5 housed in a housing section 30 and containing earthworms, thereby enabling stable treatment capacity to be achieved without affecting the earthworms living in the treatment bed 5.

[0034] A modified example of the sewage treatment device of this embodiment will be described. As shown in Fig. 8, the waterproof sheet 50A is partially folded below the pipe connection portion 70 where the drain pipe 102 connects to the pit member 2. By providing the folding portion 62 of the waterproof sheet 50A, when the surrounding soil sinks after the installation of the sewage treatment device 1 and the waterproof sheet 50A slides downward, the folding portion 62 stretches downward, thereby alleviating the tension that pulls the top edge of the waterproof sheet 50A downward.

[0035] The above-described embodiments are merely examples and are not limited to the scope of the disclosure. The above-described embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the disclosure. These embodiments and their modifications are included in the scope of the claims and their equivalents.

[0036] In the above embodiment, an example was shown in which the sewage treatment device 1 is circular in plan view, but the shape of the sewage treatment device is not limited to a circle. For example, the pit member and container may be cylindrical, such as a substantially square prism.

[0037] In the above embodiment, the waterproof sheet 50 is attached to the outside of the pit member 2, but the waterproof sheet 50 may be attached to the inside of the pit member 2 if some kind of holding means is available.

[0038] In the above embodiment, the case where the treatment bed 5 and the drainage bed 6 are provided inside the pit member has been described, but the treatment bed 5 and the drainage bed 6 do not necessarily have to be provided.

[0039] In the above embodiment, an example was shown in which the drainage bed 6 and treatment bed 5 made of gravel were contained within the storage section 30, but the configuration of the drainage bed 6 is not limited to this example. The presence of the drainage bed 6 allows the treatment bed 5 and the bottom 31 to be spaced apart. It is only necessary that the liquid treated in the treatment bed 5 be able to flow downward. For example, a void layer may be formed between the bottom 31 and the treatment bed 5 instead of the drainage bed 6.

[0040] The present disclosure includes the following aspects.

[0041] (1) a pit member formed into a cylindrical shape by combining a plurality of panel members; a waterproof sheet for preventing rainwater from entering the inside of the pit member; A sewage treatment device comprising: a lid member that covers the top of the pit member.

[0042] (2) The inside of the pit member is configured as a storage section, The sewage treatment device according to (1), wherein the storage section is provided with a sewage treatment bed.

[0043] (3) A sewage treatment device according to (1) or (2), wherein the waterproof sheet is provided on the outside of the pit member.

[0044] (4) A sewage treatment device according to any one of (1) to (3), wherein the waterproof sheet is large enough to protrude above the upper end of the pit member.

[0045] (5) A piping connection portion is provided to connect a drainage pipe to the pit member, The sewage treatment device according to any one of (1) to (4), wherein the waterproof sheet is partially folded below the pipe connection portion.

[0046] (6) An opening through which the drain pipe is inserted is formed in the waterproof sheet facing the piping connection portion, The sewage treatment device according to (5), wherein the opening is a hole smaller than the outer diameter of the drain pipe. [Explanation of symbols]

[0047] 1...Sewage treatment device, 2...Pit member, 4...Cover member, 5...Treatment floor (sewage treatment floor), 10...Prefabricated structural component (panel member), 30...Storage section, 50, 50A...Waterproof sheet, 52...Hole (opening), 70...Pipe connection section, 100...Sewage treatment system, 101...Toilet bowl, 102...Drain pipe

Claims

1. a pit member formed into a cylindrical shape by combining a plurality of panel members; a waterproof sheet for preventing rainwater from entering the inside of the pit member; A sewage treatment device comprising: a lid member that covers the top of the pit member.

2. The inside of the pit member is configured as a storage section, The sewage treatment device according to claim 1, wherein the storage section is provided with a sewage treatment bed.

3. The sewage treatment device according to claim 1, wherein the waterproof sheet is provided on the outside of the pit member.

4. The sewage treatment device according to claim 1, wherein the waterproof sheet is sized to protrude above an upper end of the pit member.

5. A piping connection portion is provided to connect a drainage pipe to the pit member, The sewage treatment device according to claim 1 , wherein the waterproof sheet is partially folded below the pipe connection portion.

6. The waterproof sheet facing the piping connection portion has an opening through which the drain pipe is inserted, The sewage treatment device according to claim 5 , wherein the opening is a hole smaller than an outer diameter of the drain pipe.

7. The sewage treatment device according to any one of claims 1 to 6, which is buried underground; A toilet installed on the ground, a drain pipe connecting the drain outlet of the toilet and the sewage treatment device; A sewage treatment system comprising: a sewage treatment bed housed within the housing portion of the pit member and containing earthworms.

8. Dig a hole in the ground large enough to place the wastewater treatment device. Assemble multiple panel members to create a pit member, placing the pit member in the hole; A waterproof sheet is attached to cover the outside of the pit member, A drainage pipe is attached to the pit member from the outside of the waterproof sheet; A construction method for a sewage treatment system that backfills the area around the pit component.

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