JP5060239B2 - Septic tank air diffuser - Google Patents

Description

  The present invention relates to a diffuser for a septic tank provided with a diffuser member in which a diffuser hole for diffusing in a septic tank is formed and a gas supply pipe communicating with the diffuser member.

  In such a septic tank, for example, treated water such as domestic wastewater passes through an aerobic treatment tank inhabited by aerobic microorganisms, so that organic substances contained in the treated water are decomposed by the action of the aerobic microorganisms. In other words, treated water that contains almost no organic substances is discharged into rivers and lakes. At this time, an air diffuser comprising a diffuser member in which a diffuser hole is formed and a gas supply pipe communicating with the diffuser member is installed in the aerobic treatment tank, and the air passing through the gas supply pipe is By ejecting from the diffuser hole of the diffuser member, an environment in which aerobic microorganisms can live can be maintained.

Conventionally, in this kind of septic tank air diffuser, there has been one in which pipes are connected to each other with an elbow or cheese to constitute a frame-shaped air diffuser.
In the above conventional configuration, when connecting and assembling pipes with elbows and cheeses, there are many connection points between the pipes and elbows and cheeses, and when connecting pipes, the postures of the pipes are likely to be out of order. There is a possibility that the assembly accuracy of the air diffuser cannot be improved. Furthermore, since piping is connected with elbow or cheese, the assembly work of the diffuser member becomes complicated. In addition, in addition to a plurality of pipes, a large number of elbows and cheeses that connect the pipes are required, which increases the number of parts of the diffuser member.
On the other hand, in order to solve these problems, the manifold member is integrally formed in a form in which a plurality of short pipe portions protruding in one direction are provided at intervals in the long pipe portion, and the short pipe portion is opposed to the manifold member. There are two which are provided in a state, and the short pipe portions of the manifold members are connected by piping to form a frame-like air diffuser (for example, see Patent Document 1).

JP 2003-326293 A

  In the above improved configuration, the manifold members are integrally molded, so when connecting and assembling the short pipe parts of the manifold members with pipes, there are few connection points between the pipes and the short pipe parts and the pipes are connected. In doing so, it is difficult to cause a deviation in the posture between the pipes, so that the assembly accuracy of the air diffuser can be improved. However, since the short pipe portions of the manifold member are connected by piping, the assembling work of the diffuser member becomes complicated. In addition, since two manifold members connected to these pipes are required in addition to a plurality of pipes, only two manifold members are required as compared with the case where a large number of elbows and cheeses are provided as in the conventional configuration. Since it is necessary to provide a plurality of pipes, the number of parts of the air diffuser cannot be reduced sufficiently. In addition, the diffuser holes are often post-processed by a drill or the like because of the manufacturing method, and the work becomes complicated and processing errors may occur.

  The present invention has been made in view of the above circumstances, and its object is to simplify assembly work and reduce costs while improving assembly accuracy. Thus, the present invention is to provide a septic tank air diffuser capable of reducing the number of parts.

An air diffuser for a septic tank according to the present invention is provided with an air diffusing member made of a cylindrical body in which an air diffusing hole for diffusing in the septic tank is formed, and a gas supply pipe communicating with the air diffusing member. In some embodiments, the diffuser member is composed of only two divided members radially divided into an upper divided member and a lower divided member, and the upper divided member and the lower divided member. Thea and integrated by bonding dividing member on the side in the radial direction is, the dividing member, the engaged portion cylindrical along the vertical direction are integrally formed, the gas supply pipe to the engaged portion It is in the point to be connected .

That is, since the divided members divided in the radial direction are joined and integrated in the radial direction, there is only one joining portion of the divided members, and the divided members divided in the radial direction are joined in the radial direction. Since the diffuser member is formed only by this, the assembly accuracy of the diffuser member can be improved. Further, the diffuser member can be assembled by a simple operation of simply joining the divided members divided in the radial direction in the radial direction. In addition, since it is only necessary to provide two divided members divided in the radial direction, the number of parts of the diffuser member can be reduced.
Accordingly, it is possible to obtain a septic tank air diffuser capable of improving assembly accuracy, simplifying assembly work and reducing costs, and reducing the number of components. It came to.

In addition, since the gas supply pipe is connected to the diffuser member via the engaged portion, assembly work and replacement work are easy, and, for example, polypropylene that is inexpensive and lightweight but has poor adhesion. Even if the diffuser member and the gas supply pipe are different and difficult to adhere, such as a gas supply pipe made of vinyl chloride with good adhesion and good workability Can be linked.

According to a second characteristic configuration of the present invention, the engaged portion is provided with a pair of slits extending downward from the upper surface at intervals in the circumferential direction, and a plurality of the pairs of slits are provided at intervals in the circumferential direction. There is a claw that protrudes inwardly at the tip of a strip-shaped portion formed between a pair of slits, and the top and bottom of the gas supply pipe are fitted into the engaged portion in the vertical direction A pair of ribs extending downward from a flange formed at the upper end of the engaging portion is provided at intervals in the circumferential direction, and the pair of ribs are spaced apart in the circumferential direction. A hole penetrating between a portion surrounded by a pair of ribs and a flange and the upper surface of the flange is formed, a step is formed in the hole, and the engaging portion is While being fitted into the engaged portion, a pair of slits and a pair When each of the pair of ribs is inserted into each of the pair of slits in phase with the ribs, the claw portion formed at the tip of the strip-shaped portion is locked to the stepped portion of the hole, and the engaging portion is By engaging with the engaged portion, the gas supply pipe is connected to the diffuser member.

  An air diffuser for a septic tank according to the present invention is provided with an air diffusing member made of a cylindrical body in which an air diffusing hole for diffusing in the septic tank is formed, and a gas supply pipe communicating with the air diffusing member. An air diffuser for a septic tank, the characteristic configuration of the air diffuser is divided into an upper divided member and a lower divided member in the radial direction, and the divided members are arranged in the radial direction. And a protrusion for positioning with respect to the septic tank is integrally formed with the diffuser member.

  That is, since the protrusions are integrally formed on the air diffusing member, for example, an operation of attaching the protrusions to the air diffusing member is unnecessary, and the assembling work of the air diffusing member can be further simplified.

[First embodiment]
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 and FIG. 2 show a septic tank for purifying domestic wastewater (sewage) as treated water. Although not described in detail, an anaerobic treating tank 2 for anaerobically treating treated water from the outside, An aerobic treatment tank 3 for aerobically treating the water to be treated that has passed through the anaerobic treatment tank 2, a precipitation tank 4 for precipitating solids in the water to be treated that has passed through the aerobic treatment tank 3, and the like are provided. . And in order to maintain the environment where aerobic microorganisms can inhabit, the aeration apparatus A is installed in the aerobic treatment tank 3.

  The aerobic treatment tank 3 is provided so that the water to be treated that has passed through the anaerobic treatment tank 2 naturally flows from the advection port 5, and a polyethylene resin or a polypropylene resin filled in a fluidized state in the tank, By agitating the spherical carrier 6 made of resin such as polyurethane resin with the air blown from the air diffuser A, the biological film adhering to the surface of the carrier 6 and the water to be treated are repeatedly brought into contact with each other. In addition, nitrogen is removed in the aerobic treatment tank 3 by decomposing and removing organic substances in water to be treated and oxidizing nitrogen compounds. Although not described in detail, the aerobic treatment tank 3 and the sedimentation tank 4 are communicated with each other at the bottom, and the water to be treated that has passed through the aerobic treatment tank 3 is provided so as to be naturally transferred to the precipitation tank 4. .

  Two guide ribs 26 are provided on the inner wall of the aerobic treatment tank 3. The guide rib 26 includes a straight portion 26a extending in the vertical direction at substantially the same interval as both side surfaces in the left-right direction (direction intersecting the tank arrangement direction) of the left-right positioning projection 34 described later, and the straight portion 26a. And a bent portion 26b whose width increases as it goes upward. Two positioning ribs 27 are provided at the bottom of the aerobic treatment tank 3. The positioning ribs 27 are provided so that one end thereof is at substantially the same interval as both side surfaces in the left-right direction (direction intersecting the tank arrangement direction) of the front-rear positioning protrusions 35 to be described later. It is configured in a letter shape.

Hereinafter, the diffuser A according to the present invention will be described.
A polypropylene air diffuser member 29 having an air diffuser hole 28 for air diffused in the septic tank and a vinyl chloride gas supply pipe 30 communicating with the air diffuser member 29 are provided. . The diffuser member 29 is divided in the radial direction (up and down direction) to provide the divided member 31, and the divided members 31 are joined and integrated in the radial direction.

  In addition, as shown in FIGS. 3 to 5, in order to configure the air diffuser 29, three short portions 29b along the left-right direction are arranged side by side in the front-rear direction, and the short portions 29b are arranged. A long portion 29a for connecting the end portions of each other is provided and is configured in a rectangular frame shape in plan view. The long portion 29a and the outer short portion 29b have a circular cross-sectional shape, and the inner short portion 29b has a substantially elliptic cross-sectional shape. And as shown in FIG. 5, the division member 31 is divided | segmented into the radial direction and divided | segmented into the upper division member 31a and the lower division member 31b, and the end surfaces of these division members 31 are joined by hot plate welding. And integrated.

  Thus, since the divided members 31 divided in the radial direction are joined and integrated in the radial direction, there is only one joining portion of the divided members 31, and the divided member 31 divided in the radial direction is the diameter. Since the diffuser member is formed only by joining in the direction, the assembly accuracy of the diffuser member 29 can be improved. Furthermore, the diffuser member 29 can be assembled by a simple operation of simply joining the divided members 31 divided in the radial direction in the radial direction. In addition, since it is only necessary to provide the two divided members 31 divided in the radial direction, the number of parts of the diffuser member 29 can be reduced. Further, the air diffusing member 29 can be made of inexpensive and lightweight polypropylene. Furthermore, for example, when integrally forming the diffuser member 29 with vinyl chloride, it is necessary to integrally mold the diffuser member 29 with polypropylene as compared with the need to perform corrosion prevention processing on the mold. Further, the production cost can be further reduced, for example, it is not necessary to perform a corrosion prevention process on the mold.

  The split member 31 is formed by injection molding, and an upper split member 31a is integrally formed with a cylindrical engaged portion 33 extending in the vertical direction and a left and right positioning projection 34 for positioning in the horizontal direction. The lower split member 31b is formed so that a diffuser hole 28 provided along the longitudinal direction is opened, and a front / rear positioning protrusion 35 for positioning in the front / rear direction, and a vertical positioning for positioning in the vertical direction The protrusion 37 is integrally formed. Then, as the diffuser member 29 is allowed to settle in the liquid in the septic tank, a slope portion 37c for guiding the diffuser member 29 to the inner wall side of the septic tank is formed in the vertical positioning projection 37.

  As shown in FIG. 6, the engaged portion 33 is provided with a pair of slits 38 extending downward from the upper surface at intervals in the circumferential direction, and four pairs of slits 38 are provided at intervals in the circumferential direction. Configured. A claw portion 43 a that protrudes inward is formed at the tip of the strip-shaped portion 43 formed between the pair of slits 38.

  The left and right positioning protrusions 34 are provided on the outer short portion 29b of the upper split member 31a so as to protrude outward, and as shown in FIG. 2, the diffuser member 29 is moved downward. Accordingly, while the left and right side surfaces of the left and right positioning projections 34 are in contact with the bent portions 26b of the two guide ribs 26, the position in the left and right direction of the diffuser member 29 is gradually regulated. Both side surfaces of the left and right positioning projections 34 in the left and right direction are configured to enter between the straight portions 26 a of the two guide ribs 26. Thereby, the position of the aeration member 29 in the left-right direction is regulated.

  The front-rear positioning protrusion 35 is provided in a state of protruding outward on the outer short portion 29b of the lower divided member 31b, and when the diffuser member 29 is moved to the bottom, The side surface in the front-rear direction of the protrusion 34 is in contact with the inner wall of the aerobic treatment tank 3, and the side surface in the left-right direction of the front-rear positioning protrusion 35 is inserted between one end of the positioning rib 27. is there. Thereby, the position of the air diffusion member 29 in the front-rear direction is regulated.

  Accordingly, since the air diffuser hole 28 is formed in the split member 31, the work of opening the hole is unnecessary, and the assembling work of the air diffuser member 29 can be further simplified. Further, for example, machining errors are eliminated as compared with drilling holes, and product variations can be eliminated. When the air diffuser 29 is formed, the left and right positioning protrusions 34, the front and rear positioning protrusions 35, and the vertical positioning protrusion 37 are integrally formed on the air diffuser 29. The operation of attaching the positioning projection 34, the front / rear positioning projection 35, and the vertical positioning projection 37 is not required, and the assembly work of the air diffuser 29 can be further simplified. Further, when the air diffusing member 29 is allowed to settle in the liquid in the septic tank, the air diffusing member 29 is guided to the inner wall side of the septic tank. For example, the right and left positioning protrusions 34 enter the inner wall of the septic tank. In the case of providing the guide rib 26 as a positioning member for positioning the air diffusing member 29, the air diffusing member 29 can be positioned by a simple operation of simply allowing the air diffusing member 29 to settle in the liquid in the septic tank. This can be achieved with a simple configuration in which the slope portion 37 c is formed on the vertical positioning projection 37.

  The upper and lower positioning projections 37 are configured by forming a substantially rectangular plate-like projecting member 37a projecting downward from an inner short portion 29b of the lower divided member 31b into a side surface of the projecting member 37a. A substantially triangular plate-shaped reinforcing member 37b that connects the outer peripheral surface of the short portion 29b on the inner side with a space in the left-right direction is attached. Then, as the diffuser member 29 is allowed to settle in the liquid of the aerobic treatment tank 3, the spherical carrier 6 filled in the tank in a fluidized state comes into contact with the oblique side portion 37c of the reinforcing member 37b and diffuses. By guiding the air member 29 to the inner wall side of the aerobic treatment tank 3, both the left and right side surfaces of the left and right positioning protrusions 34 are configured to enter between the two guide ribs 26. Therefore, the oblique side portion of the reinforcing member 37b constitutes an inclined surface portion 37c that guides the air diffusing member 29 to the inner wall side of the aerobic treatment tank 3, and the air diffusing member 29 is attached to the reinforcing member 37b that reinforces the protruding member 37a. A function of guiding to the inner wall side of the aerobic treatment tank 3 is provided.

  A cylindrical vinyl chloride engaging portion 39 is attached to the tip of the gas supply pipe 30 with an adhesive along the vertical direction. As shown in FIG. 6, a pair of ribs 41 downward from the flange 40 formed at the upper end is provided at intervals in the circumferential direction, and four of the pair of ribs 41 are provided at intervals in the circumferential direction. . A hole 42 penetrating between a portion surrounded by the pair of ribs 41 and the flange 40 and the upper surface of the flange 40 is formed, and a stepped portion 42 a is formed in the hole 42.

  When the configuration for engaging the engaging portion 39 with the engaged portion 33 is described, the engaging portion 39 is fitted into the engaged portion 33 as shown in FIGS. However, when each of the pair of ribs 41 is inserted into each of the pair of slits 38 by matching the phases of the pair of slits 38 and the pair of ribs 41, the claw portion 43 a formed at the tip of the strip-shaped portion 43 becomes a hole. The engaging portion 39 is engaged with the engaged portion 33 by being engaged with the step portion 42 a of 42.

  When the engagement between the engaged portion 33 and the engaging portion 39 is released, a rod is inserted into the hole 42 formed in the upper surface of the flange 40 of the engaging portion 39 from above, and the tip of the rod becomes the claw portion 43a. The claw portion 43a formed at the tip of the strip-shaped portion 43 and the step portion 42a of the hole 42 by bending the strip-shaped portion 43 outward against the elastic restoring force in contact with the slope formed on The engagement between the engaged portion 33 and the engaging portion 39 is released simply by pulling out the engaging portion 39 from the engaged portion 33. Therefore, the engaging part 39 and the engaged part 33 constitute an engaging connection mechanism KR, and the gas supply pipe 30 is connected to the air diffusion member 29 via the engaging connection mechanism KR.

  As described above, since the gas supply pipe 30 is connected to the diffuser member 29 via the engagement connecting mechanism KR, a pair of slits are fitted while the engaging portion 39 is fitted into the engaged portion 33. Assembling can be performed by a simple operation of simply inserting each of the pair of ribs 41 into each of the 38, and a rod is inserted into the hole 42 formed on the upper surface of the flange 40 of the engaging portion 39 from above. Thus, the removal work can be performed by a simple work of simply pulling the engaging part 39 out of the engaged part 33, so that the assembling work and the exchange work are easy, and it is cheap and lightweight, but with poor adhesion. Even if it is a case where the gas supply pipe | tube 30 is comprised with the vinyl chloride which comprises the diffuser member 29 and has favorable adhesiveness and workability, it can connect favorably.

  In addition, a cylindrical engaged portion 33 extending in the up-down direction is integrally formed with the upper divided member 31a, and the engaged portion 33 has a slit 38 extending downward from the upper surface spaced apart in the circumferential direction. A pair of slits 38 are provided, and four of the pair of slits 38 are provided at intervals in the circumferential direction, and a claw portion that protrudes inwardly at the tip of a strip-shaped portion 43 formed between the pair of slits 38. 43a is formed, and when the upper divided member 31a is formed by injection molding, the engaged portion 33 is integrally formed with the upper divided member 31a. Therefore, the engaged portion 33 is formed on the upper divided member 31a. It is possible to further simplify the assembling work of the air diffusing member 29 without requiring the attaching work.

[Another embodiment]
(1) In the above embodiment, the configuration in which the divided member 31 is formed by injection molding is illustrated. However, instead of such a configuration, the divided member 31 may be formed by molding or the like. .

(2) In the above embodiment, the left and right positioning projections 34 for positioning in the left-right direction are formed integrally with the upper divided member 31a, and the lower split member 31b is provided along the longitudinal direction. Although the configuration in which the air hole 28 and the front-rear positioning protrusion 35 for positioning in the front-rear direction are integrally formed is illustrated, the left-right positioning protrusion 34 for left-right positioning is provided on the lower divided member 31b. The structure may be such that the upper divided member 31a is integrally molded with a diffuser hole 28 provided along the longitudinal direction and a front / rear positioning protrusion 35 for positioning in the front / rear direction. The projecting portion 34, the front / rear positioning projecting portion 35, and the diffuser hole 28 may be provided in any of the divided members 31.

(3) In the above-described embodiment, the engaged member 33, the left / right positioning projection 34, the diffuser hole 28, the front / rear positioning projection 35, and the vertical positioning projection 37 are integrated with the divided member 31. Although the molded configuration is exemplified, instead of such a configuration, the divided member 31 includes an engaged portion 33, a left and right positioning projection 34, a front and rear positioning projection 35, and a vertical positioning projection 37. For example, the diffuser hole 28 may be opened with a drill.

(4) In the above embodiment, the configuration in which the air diffusing member 29 is made of polypropylene is exemplified. However, the configuration is not limited to such a configuration. For example, polyethylene, vinyl chloride, ABS, polyethylene, polyurethane Various resins can be used.

(5) In the above embodiment, as the engagement connecting mechanism KR, the engagement portion 39 is attached to the tip of the gas supply pipe 30, and the engaged portion 33 is integrally formed with the divided member 31, and the engaged portion The configuration in which the gas supply pipe 30 is connected to the air diffusing member 29 by engaging the engaging portion 39 with 33 is illustrated, but instead of such a configuration, the tip of the gas supply pipe 30 is connected. The male screw part is attached, the female screw part is attached to the split member 31, and the gas supply pipe 30 is connected to the air diffuser member 29 by screwing the male screw part into the female screw part. Also good.

(6) Alternatively, a vinyl chloride socket part is insert-molded into the polypropylene split member 31, the tip of the gas supply pipe 30 is inserted into the socket part, and the gas supply pipe 30 is fixed to the socket part with an adhesive. It is good also as a structure which is.

(7) In the above embodiment, as the diffuser member 29 is allowed to settle in the liquid of the aerobic treatment tank 3, the slope portion that guides the diffuser member 29 to the inner wall side of the aerobic treatment tank 3 is moved up and down. Although the configuration formed on the positioning projection 37 has been illustrated, instead of such a configuration, as the aeration member 29 settles in the liquid of the aerobic treatment tank 3, the aeration member 29 is favored. It is good also as a structure which provided the slope part guided to the inner wall side of the tempering processing tank 3 separately from the protrusion 37 for vertical positioning. Specifically, it is conceivable that a plate-shaped blade member inclined from the up-down direction is bridged between the long portions 29a.

(8) In the above embodiment, the configuration in which the end faces of the divided members 31 are joined by hot plate welding is illustrated, but the end faces of the divided members 31 may be joined by an adhesive, or the upper divided member. 31a is externally or internally fitted to the lower divided member 31b and joined, or an inrow portion or an engaging portion is formed at the end of the divided member 31, and the engagement of the inrow portion or the engagement portion is engaged. You may join by joining.

(9) In the above-described embodiment, the configuration in which the divided members 31 are joined and integrated by hot plate welding is exemplified. However, the welding configuration is not limited to hot plate welding, and vibration welding, ultrasonic waves are not limited. Various types of welding such as welding, impulse welding using a linear heater, electromagnetic induction welding, high-frequency welding, laser welding, and infrared welding can be used.

(10) In the above-described embodiment, the divided member 31 is formed by injection molding, and the end surfaces of the divided member 31 are joined and integrated by hot plate welding, but diffused by die slide injection molding. The member 29 may be formed all at once.

(11) In the above embodiment, the split member 31 is illustrated as having a rectangular frame shape in plan view, but the overall shape of the split member 31 is not limited to such a configuration. The dividing member 31 may be configured in a plate shape, a fishbone shape, or a lattice shape in plan view.

(12) In the above embodiment, the configuration of the divided member obtained by dividing the cylindrical body having a circular or substantially elliptical cross-section into two in the radial direction is illustrated, but instead of such a configuration, the cross-sectional shape is rectangular. It is good also as a structure of the division member which divided a certain cylindrical body into radial direction (long side or short side direction).

(13) In the above embodiment, the anaerobic treatment tank 2, the aerobic treatment tank 3 for aerobically treating the treated water that has passed through the anaerobic treatment tank 2, and the solid in the treated water that has passed through the aerobic treatment tank 3 However, the configuration of the upstream and downstream tanks of the aerobic treatment tank 3 is not limited to this, and instead of the anaerobic treatment tank 2, the configuration is provided. An aerobic treatment tank may be further provided, or a temporary storage tank for temporarily storing water to be treated from the outside may be provided, or a filtration tank and a treated water tank may be provided on the downstream side of the aerobic treatment tank 3. .

Plan view of main parts of septic tank Perspective view of main part of septic tank Top view of diffuser Side view of diffuser Perspective view of air diffuser The figure which shows an engagement connection mechanism The figure which shows an engagement connection mechanism

28 Aeration hole 29 Aeration member 30 Gas supply pipe 31 Split member 34, 35, 37 Projection 37c Slope KR Engagement connection mechanism

Claims (3)

An air diffuser for a septic tank provided with an air diffusing member made of a cylindrical body in which an air diffuser hole for diffusing in the septic tank is formed and a gas supply pipe communicating with the air diffusing member,
The diffuser member is composed of only two divided members radially divided into an upper divided member and a lower divided member, and joins the upper divided member and the lower divided member in the radial direction. integrated Te tare is,
A diffuser for a septic tank, in which a cylindrical engaged portion along the vertical direction is integrally formed on the divided member, and the gas supply pipe is connected to the engaged portion . In the engaged portion, a pair of slits extending downward from the upper surface is provided at intervals in the circumferential direction, and a plurality of the pairs of slits are provided at intervals in the circumferential direction, and formed between the pair of slits. A claw portion protruding inwardly is formed at the tip of the strip-shaped portion formed,
A cylindrical engagement portion extending in the vertical direction and fitted into the engaged portion is attached to the distal end of the gas supply pipe, and a rib extending downward from a flange formed at the upper end of the engagement portion is disposed in the circumferential direction. A pair of ribs are provided at intervals in the circumferential direction, and a pair of ribs are provided at intervals in the circumferential direction to form a hole penetrating between a portion surrounded by the pair of ribs and the flange and the upper surface of the flange. A step is formed in the hole,
Inserting each of the pair of ribs into each of the pair of slits while aligning the phases of the pair of slits and the pair of ribs while fitting the engaging portion into the engaged portion, at the tip of the strip-shaped portion The gas supply pipe is connected to the diffuser member by engaging the formed claw portion with a stepped portion of a hole and engaging the engaging portion with the engaged portion. The septic tank air diffuser according to claim 1 . An air diffuser for a septic tank provided with an air diffusing member made of a cylindrical body in which an air diffuser hole for diffusing in the septic tank is formed and a gas supply pipe communicating with the air diffusing member,
The diffuser member is configured to be divided into an upper divided member and a lower divided member in the radial direction, and the divided members are joined and integrated in the radial direction,
A septic tank air diffuser in which a protrusion for positioning with respect to the septic tank is formed integrally with the air diffuser.

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