JP7296105B2 - Air diffuser and air diffusion method - Google Patents

Description

The present invention relates to air diffusion technology.

Patent Literature 1 below discloses this type of air diffuser. This air diffuser is for sending air into the tank of the aeration tank. As a specific example of this air diffuser, an air diffusion structure has a trunk pipe having two air supply pipes connected to each end thereof, and a plurality of branch pipes branched from the trunk pipe and extending parallel to each other. , and an air diffusion structure in which two air supply pipes are respectively connected to both sides of an annularly formed loop pipe.

In these air diffusion structures, branch pipes and diffuser pipes, which are loop pipes, are provided with a plurality of air ejection holes, and each air supply pipe is connected to an air supply header pipe via an on-off valve. When the air diffusion process is performed, the opening/closing valve of one air supply pipe is closed and the opening/closing valve of the other air supply pipe is opened, so that the air supplied from the air supply header pipe is distributed to the plurality of air diffusers. It spouts out through the spout holes.

JP 2005-138016 A

The above air diffuser can diffuse air over a wide area in the tank by forming an air diffusion plane along the surface of the stored liquid during the air diffusion process. However, during the air diffusion process, the air supplied from the air supply header pipe flows into the diffuser pipe only from one of the two air supply pipes. The diffused air volume of the air ejection holes located downstream is much lower than that of the air ejection holes located most upstream, and the most downstream air ejection holes are likely to be blocked. For this reason, this air diffuser has a problem that it is difficult to perform a well-balanced diffusion treatment over a wide range in the tank using the entire air diffuser pipe.

The present invention has been made in view of this problem, and aims to provide a technique with excellent aeration treatment performance.

One aspect of the present invention is
An air diffuser for sending air into a liquid to be treated stored in a treatment tank,
an air header tube connected to an air supply;
having a first curved pipe portion and a second curved pipe portion provided with a plurality of air ejection holes, wherein the first curved pipe portion and the second curved pipe portion are connected in series at respective one ends; an air diffusion pipe forming an air diffusion plane along the surface of the liquid to be treated;
a first connection pipe that connects the air supply header pipe and the other end of the first curved pipe portion via a first opening/closing valve;
a second connection pipe that connects the air supply header pipe and the other end of the second bent pipe portion via a second opening/closing valve;
with
By opening both the first on-off valve and the second on-off valve while the air diffusion pipe is immersed in the liquid to be treated in the treatment tank during the aeration treatment, the first connection pipe and the second connection pipe are opened. an air diffuser configured such that air is fed into the diffuser pipe from both sides of the first bent pipe portion and the second bent pipe portion through a connecting pipe;
It is in.

Another aspect of the invention is
An aeration method for sending air into a liquid to be treated stored in a treatment tank,
An air supply header pipe connected to an air supply source, and a first curved pipe portion and a second curved pipe portion provided with a plurality of air ejection holes, wherein The air diffuser pipes, which are connected in series with each other at one end and form an air diffusion plane along the surface of the liquid to be treated, and the air supply header pipe and the other end of the first bent pipe portion a first connecting pipe connecting via one opening/closing valve; and a second connecting pipe connecting the air supply header pipe and the other end of the second bent pipe portion via a second opening/closing valve. a preparation step of preparing the air device;
By opening both the first opening/closing valve and the second opening/closing valve in a state in which the air diffusion pipe of the air diffuser is immersed in the liquid to be treated in the treatment tank, the first connection pipe and the second connection pipe are opened. an air diffusion treatment step of feeding air from both sides of the first bent pipe portion and the second bent pipe portion into the diffuser pipe through a connecting pipe;
an aeration method comprising
It is in.

In each of the above aspects, in the diffuser pipe of the air diffuser, the first bent pipe portion and the second bent pipe portion having a plurality of air ejection holes are connected in series at one end of each without branching. Further, the first bent pipe portion and the second bent pipe portion form an air diffusion plane along the surface of the liquid to be treated. The air-supply header pipe is connected to the first bent portion of the air diffuser via the first connecting pipe, and is connected to the second bent pipe of the air diffuser via the second connecting pipe.

Therefore, when the air diffusion process is performed, both the first opening and closing valve and the second opening and closing valve are opened, so that the air diffuser passes through the first connecting pipe and the second connecting pipe to the first bent pipe portion and the second bent pipe. Air can be blown in from both sides of the part. At this time, the first curved tube portion and the second curved tube portion of the air diffusion pipe form an air diffusion plane along the surface of the stored liquid, making it possible to diffuse air over a wide area in the treatment tank during the air diffusion treatment. Become. Moreover, in the diffuser pipe, the flow direction of air flowing from the first connecting pipe into the first curved pipe portion and the flow direction of air flowing from the second connecting pipe into the second curved pipe portion are opposite to each other. Therefore, it is possible to reduce the difference in diffusion air volume between the air ejection hole located most upstream in the inflow direction and the air ejection hole located most downstream among the plurality of air ejection holes. The ejection holes are also less likely to be blocked. For this reason, it becomes possible to perform well-balanced aeration treatment over a wide area in the treatment tank using the entire air diffusion pipe.

As described above, according to each of the above aspects, it is possible to provide a technique excellent in diffusion treatment performance.

FIG. 2 is a diagram schematically showing the structure of a treatment tank in the air diffuser of Embodiment 1; 1 is a perspective view of an air diffuser according to Embodiment 1. FIG. FIG. 3 is a plan view of FIG. 2; FIG. 4 is a plan view of one of the two air diffusers in FIG. 3; The top view which shows the support structure of each vertical pipe part of a 1st connecting pipe and a 2nd connecting pipe in FIG. FIG. 3 is a perspective view showing how the air diffuser of FIG. 2 is performing an air diffusion treatment step; FIG. 3 is a perspective view showing how the air diffuser of FIG. 2 is being cleaned. FIG. 3 is a perspective view corresponding to FIG. 2 of the air diffuser of Embodiment 2; FIG. 11 is a plan view of one of the two air diffusers of the air diffuser of Embodiment 3;

Preferred embodiments of the above aspects will now be described.

In the above air diffuser, the air diffuser pipe is arranged lower than the manhole opening in the height direction of the treatment tank, and the first connecting pipe and the second connecting pipe are both in the plane of projection of the manhole opening. preferably has a vertical tube portion extending linearly in the height direction.

According to this air diffuser, the first connecting pipe and the second connecting pipe can be routed to the outside of the tank through the manhole opening using the respective vertical pipe portions without using the bent pipe portion or the like. , the structure of the first connecting pipe and the second connecting pipe can be simplified.

In the above air diffuser, the manhole opening has a rectangular opening shape in plan view in the height direction consisting of four opening edge portions. A tube is configured to be positioned along and secured to a supporting opening edge that is any one of the four opening edges of the manhole opening. is preferred.

According to this air diffuser, the vertical pipe portions of the first connecting pipe and the second connecting pipe can be fixed using the support opening edge portion of the manhole opening.

In the above air diffuser, the first connecting pipe and the second connecting pipe are connected to the air supply header pipe at a joint pipe portion where the first connection pipe and the second connection pipe are joined to each other, and the first opening/closing valve and the above It is preferable that one combined opening/closing valve is provided, which is also used as the second opening/closing valve.

According to this air diffuser, the first connection pipe and the second connection pipe are merged at the junction pipe portion, and the number of opening/closing valves is reduced, thereby making it possible to keep the cost of the device low.

In the air diffuser, it is preferable that the diffuser pipe is arranged below a fixed bed fixed in the treatment tank.

According to this air diffuser, by preventing clogging of the air ejection holes of the air diffuser, it becomes difficult to remove the fixed bed from the treatment tank for cleaning the air diffuser.

Hereinafter, embodiments of the air diffuser will be described with reference to the drawings.

This air diffuser is typically used in a septic tank for treating water to be treated discharged from facilities such as general households, housing complexes, commercial facilities, public facilities, and factories.

In the drawings for explaining the air diffuser, unless otherwise specified, the arrow X indicates the first direction that is the longitudinal direction of the septic tank to which the air diffuser is attached, and the arrow X indicates the first direction that is the lateral direction of the septic tank. The second direction is indicated by arrow Y, and the third direction, which is the height direction of the septic tank, is indicated by arrow Z.

(Embodiment 1)
As shown in FIG. 1, the air diffuser 10 of Embodiment 1 is installed in a septic tank 101 as a treatment tank. This air diffuser 10 is for sending air into the water to be treated that is stored in the tank of the septic tank 101 so as to form the stored liquid level WL.

The septic tank 101 is in the shape of a hollow tank. The septic tank 101 may be formed by abutting an upper tank and a lower tank which are both split in half, or may be formed integrally in a horizontal cylindrical shape. good too. This septic tank 101 includes an inflow pipe 103, an outflow pipe 104, a plurality of (four in FIG. 1) manhole openings 105 provided for entering the tank, inspecting the inside, and cleaning, and these manhole openings 105. and a plurality of manhole covers 106 each covering one of them.

The tank internal space 110 of the septic tank 101 is a space 110 for treating the water to be treated which has flowed in from the inflow pipe 103 which is the most upstream part and flows out from the outflow pipe 104 which is the most downstream part. Space. This tank internal space 110 is partitioned into a plurality of regions 111, 112, 113, and 114 by a plurality of partition walls, and communicated through a plurality of advection openings. It is configured such that the water to be treated is made to advect by using it.

The first region 111 constitutes a contaminant removing tank equipped with a solid-liquid separation means 115 such as a baffle. In the first region 111 , solid matter such as contaminants contained in the water to be treated that has flowed in from the inflow pipe 103 is solid-liquid separated by the solid-liquid separation means 115 .

The second area 112 is an area for performing anaerobic treatment of the water to be treated after being treated in the first area 111 . The second area 112 constitutes an anaerobic filter bed tank having an anaerobic filter bed 116 filled with anaerobic filter media C1 to which anaerobic microorganisms adhere. In the second region 112, the water to be treated contacts the anaerobic filter bed 116, whereby the organic contaminants contained in the water to be treated are anaerobicly treated (reduced). Also, although not shown, part of the sludge generated in the second area 112 is transferred to the first area 111 using an air lift pump.

The third area 113 is an area for aerobic treatment of the water to be treated after being treated in the second area 112 . The third region 113 constitutes a contact filter bed tank having a contact filter bed 117 filled with a contact material C2 to which aerobic microorganisms adhere and an air diffuser 10 that supplies air to the contact filter bed 117. ing. The contact filter bed 117 is a fixed bed that is fixed in the tank of the septic tank 101, the air diffusion pipe 30 of the air diffuser 10 is arranged below it, and the movement is restricted by the floating prevention frame 117a provided above it. is configured as follows.

Although the details will be described later, the air diffuser 10 includes an air supply header pipe 20 connected downstream of a blower 21 as an air supply source, and a contact filter bed 117 connected downstream of the air supply header pipe 20. and two diffuser tubes 30 attached to a plate member 118 provided directly below. In the third region 113 , organic pollutants in the water to be treated are aerobically treated with the help of oxygen in the air supplied from each air diffuser pipe 30 of the air diffuser 10 .

The fourth area 114 is an area for performing solid-liquid separation processing, disinfection processing, and the like on the water to be treated immediately before it flows out from the outflow pipe 104 . This fourth area 114 constitutes a treatment tank and a disinfection tank. Also, although not shown, part of the water stored in the treated water tank of the fourth area 114 is circulated to the first area 111 using an air lift pump. A discharge pump can be installed in the fourth area 114 as necessary.

As shown in FIGS. 2 and 3, the air diffuser 10 is a pipe for feeding the air discharged by the blower 21. In addition to the air feed header pipe 20 and the two diffuser pipes 30, each diffuser A first connecting tube 41 and a second connecting tube 42 connected to the trachea 30 are provided.

Each diffuser pipe 30 has a first bent pipe portion 31 and a second bent pipe portion 32 each provided with a plurality of air ejection holes 30a (see FIG. 3). Each diffuser tube 30 is typically formed by combining and connecting a plurality of components consisting of a plurality of straight tubes S and elbows L. As shown in FIG. In addition, although the material of the components of each diffuser tube 30 is not particularly limited, it is preferable to use a resin material for weight reduction.

The first curved pipe portion 31 is a portion of each portion of each diffuser pipe 30 that extends between one end portion 31a and the other end portion 31b without branching. Like the first curved pipe portion 31, the second curved pipe portion 32 is a portion that extends between the one end portion 32a and the other end portion 32b of each diffuser pipe 30 without branching. Both the first bent pipe portion 31 and the second bent pipe portion 32 have a shape like a bent pipe having a plurality of bent portions that are bent substantially at right angles or in a curved shape. In each diffuser pipe 30, one end portion 31a of the first curved pipe portion 31 and one end portion 32a of the second curved pipe portion 32 are connected in series.

The term “serial connection” used herein refers to the amount of air sent from the air supply header pipe 20 to the first bent pipe portion 31 of the air diffuser pipe 30, ignoring the outflow of air from the air ejection holes 30a of the air diffuser pipe 30. So that the entire amount of air also flows into the second curved pipe portion 32 , or the entire amount of the air sent from the air supply header pipe 20 to the second curved pipe portion 32 of the air diffuser pipe 30 also flows into the first curved pipe portion 31 . , a configuration in which the first bent pipe portion 31 and the second bent pipe portion 32 are connected without branching. Such a series connection causes a phenomenon in which the air sent from the air supply header pipe 20 to the diffuser pipe 3 flows through a path different from that of the first bent pipe portion 31 and the second bent pipe portion 32 . can be prevented.

It should be noted that such a shape in which the first curved pipe portion 31 and the second curved pipe portion 32 are connected in series in the diffuser tube 30 can be drawn without overlapping on the already drawn line. It is also called a so-called "single-stroke shape".

The air ejection holes 30a are formed through the bottoms of the first bent pipe portion 31 and the second bent pipe portion 32, respectively, and open downward. As a result, air can be supplied to the third region 113 through the air ejection holes 30a while preventing the air ejection holes 30a from being clogged. In addition, in FIG. 3, in order to clearly explain the configuration of the air ejection holes 30a, the number and opening diameters thereof are shown in a form different from the actual ones for the sake of convenience.

Here, in the present embodiment, in the third region 113, each diffuser pipe 30 is arranged at a position lower than the manhole opening 105 (below the contact filter bed 117) in the third direction Z, which is the height direction of the septic tank 101. It is In addition, both the first connection pipe 41 and the second connection pipe 42 of each air diffusion pipe 30 have a vertical pipe portion 41a and a vertical pipe portion 42a that extend linearly in the third direction Z in the projection plane B of the manhole opening 105. have.

The first connection pipe 41 is a pipe for connecting the air supply header pipe 20 and the other end 31 b of the first curved pipe portion 31 of each air diffuser pipe 30 via the first opening/closing valve 43 . The first connecting pipe 41 is connected to the other end portion 31b of the first bent pipe portion 31 at a portion on the downstream side of the vertical pipe portion 41a.

Also, the first connecting pipe 41 is provided with a first opening/closing valve 43 and a union 43a. The first open/close valve 43 is opened during the air diffusion process. The union 43 a is arranged on the opposite side of the first connection pipe 41 to the air supply header pipe 20 with the first opening/closing valve 43 interposed therebetween.

In the first connection pipe 41, the air supply header pipe 20 and the first bent pipe portion 31 of each air diffuser pipe 30 communicate with each other when the first opening/closing valve 43 is in an open state. On the other hand, when the first opening/closing valve 43 is in the closed state, the communication between the air supply header pipe 20 and the first curved pipe portion 31 of each diffuser pipe 30 is cut off. Further, the first connection pipe 41 can be cut off in the middle by removing the union 43a.

The second connecting pipe 42 is a pipe for connecting the air supply header pipe 20 and the other end portion 32b of the second curved pipe portion 32 of each diffuser pipe 30 via the second opening/closing valve 44 . The second connecting pipe 42 is connected to the other end portion 32b of the second bent pipe portion 32 at a portion on the downstream side of the vertical pipe portion 42a.

The second connection pipe 42 is provided with a second opening/closing valve 44 and a union 44a. The second opening/closing valve 44 is opened during the air diffusion process. The union 44 a is arranged on the opposite side of the second connection pipe 42 to the air supply header pipe 20 with the second opening/closing valve 44 interposed therebetween.

In the second connection pipe 42, the air supply header pipe 20 and the second bent pipe portion 32 of each air diffuser pipe 30 communicate with each other when the second opening/closing valve 44 is in an open state. On the other hand, when the second opening/closing valve 44 is in the closed state, the communication between the air supply header pipe 20 and the second curved pipe portion 32 of each diffuser pipe 30 is blocked. Further, the second connecting pipe 42 can be cut off in the middle by removing the union 44a.

As shown in FIGS. 2 and 3, the plate member 118 is mounted in the third region 113 of the septic tank 101 directly below the contact filter bed 117 (see FIG. 1). The plate member 118 is a member in which a plurality of substantially rectangular grids are formed, and each diffuser tube 30 is fixed to the upper portion of the plate member 118 via a clip member 119 . The clip member 119 has a pair of arms that clamp the straight pipe S of each diffuser pipe 30 .

As shown in FIGS. 2 to 4, each air diffusion pipe 30 has a first curved pipe portion 31 and a second curved pipe portion 32 that extend along a diffusion plane along the storage liquid surface W of the water to be treated (see FIG. 1). It is configured to form A. That is, the air diffusion plane A is determined by the first curved pipe portion 31 and the second curved pipe portion 32 . The air diffusion plane A is a plane defined by both the first direction X and the second direction Y, and the outer edge is determined by the outer peripheral portion of the air diffusion pipe 30 when viewed in the third direction Z.

As shown in FIG. 3, the two diffuser pipes 30 have a plane-symmetrical structure configured to be plane-symmetrical with respect to a plane C defined by both the first direction X and the third direction Z. . According to such a plane-symmetrical structure, the opening/closing valves 43 and 44 provided for one diffuser tube 30 and the opening/closing valves 43 and 44 provided for the other diffuser tube 30 can be arranged plane-symmetrically. Easier to place and operate.

As shown in FIG. 4 , when each air diffuser 30 is viewed from above in the third direction Z, the first bent pipe portion 31 and the second bent pipe portion 32 have an outer dimension in the first direction X of are configured to be approximately the same. The first bent pipe portion 31 extends clockwise from the other end portion 31b in a substantially rectangular shape, starting from the other end portion 31b. On the other hand, the second bent pipe portion 32 extends clockwise from the other end portion 32b in a substantially rectangular shape when the other end portion 32b is set as a starting point. The diffuser tube 30 has a substantially inverted S shape by joining one end 31a of the first curved tube portion 31 and one end 32a of the second curved tube portion 32 .

Further, the first curved pipe portion 31 and the second curved pipe portion 32 are such that an imaginary straight line M passing through the other end portion 31b of the first curved pipe portion 31 and the other end portion 32b of the second curved pipe portion 32 extends in the first direction. It is configured to extend along X.

As shown in FIG. 5, in the present embodiment, the manhole opening 105 above each diffuser pipe 30 has a rectangular opening shape formed by four opening edge portions 105a in plan view in the third direction Z. As shown in FIG. The vertical pipe portion 41a of the first connecting pipe 41 and the vertical pipe portion 42a of the second connecting pipe 42 are connected to the support opening edge portion 105b, which is one of the four opening edge portions 105a of the manhole opening 105. are placed along the Both of the two vertical tube portions 41a and 41b are configured to be fixed by a fixing member 107 to the wall surface of the supporting opening edge portion 105b.

Next, an air diffusion method using the air diffuser 10 will be described.

This air diffusion method includes a preparation step of preparing the air diffuser 10 and an air diffusion treatment step of performing air diffusion during normal operation while the air diffuser pipe 30 of the air diffuser 10 is immersed in the water to be treated in the septic tank 101. , and a cleaning step of cleaning the diffuser tube 30 .

(Aeration treatment step)
As shown in FIG. 6, the air diffusion treatment step by the air diffuser 10 is executed by opening both the first opening/closing valves 43 and the second opening/closing valves 44 while the blower 21 is in operation.

Air sent from the air supply header pipe 20 through the first connection pipe 41 to the air diffusion pipe 30 during the air diffusion process is diffused through the plurality of air ejection holes 30 a of the first bent pipe portion 31 . Further, the air sent from the air supply header pipe 20 through the second connecting pipe 42 to the diffuser pipe 30 during the air diffusion process is diffused into the third region 113 through the plurality of air ejection holes 30a of the second curved pipe portion 32. be. This air diffusion supplies the contact filter bed 117 with air used for aerobic treatment.

At this time, both the first bent pipe portion 31 and the second bent pipe portion 32 of each diffuser pipe 30 are downstream of the air supply header pipe 20 and the air is fed through the first connection pipe 41 and the second connection pipe 42 upstream. It becomes the side tube. Therefore, air is sent into each diffuser pipe 30 from both sides of the first bent pipe portion 31 and the second bent pipe portion 32 through the first connecting pipe 41 and the second connecting pipe 42 .

(Washing step)
As shown in FIG. 7 , the step of cleaning each air diffusion pipe 30 is a step for removing blockages of the plurality of air ejection holes 30 a of each air diffusion pipe 30 . This cleaning step is executed by setting each first opening/closing valve 43 to an open state and setting each second opening/closing valve 44 to a closed state in the operating state of the blower 21 . Alternatively, each first opening/closing valve 43 may be closed and each second opening/closing valve 44 may be opened.

The air sent from the air supply header pipe 20 through the first connection pipe 41 to the diffuser pipe 30 during this cleaning is jetted through the plurality of air jet holes 30 a of the first bent pipe portion 31 . Also, the air sent from the air supply header pipe 20 through the second connection pipe 42 to the diffuser pipe 30 during the air diffusion process is ejected through the plurality of air ejection holes 30 a of the second curved pipe portion 32 . As a result, the inside of each diffuser pipe 30 and the plurality of air ejection holes 30a are both air-washed.

At this time, since the first curved pipe portion 31 and the second curved pipe portion 32 of the air diffuser pipe 30 are connected in series, the phenomenon that the air sent from the air supply header pipe 20 flows through a different route is prevented. Therefore, it is more effective to eliminate the clogging of the air ejection holes 30a than when the diffuser pipes 30 are connected in parallel.

It is preferable to increase the amount of air discharged from the blower 21 so that the linear velocity of the air jetted from each air jetting hole 30a becomes higher than that during the air diffusion process. This enhances the effect of eliminating blockage of the air ejection holes 30a.

When the cleaning method using the above-described cleaning step is set as the first cleaning method, each diffuser pipe 30 can also be cleaned by the following second to fifth cleaning methods different from the first cleaning method. It is possible.

(Second cleaning method)
A second cleaning method is a method of removing one of the two unions 43a and 44a and causing air to flow out from the divided portion while the air diffuser 10 is performing the diffusion process. According to this second cleaning method, the water to be treated is sucked into the pipe through the plurality of air ejection holes 30a by the air flow toward the cut point in each diffuser pipe 30, and flows out from the cut portion together with the air. At this time, the water to be treated flows in the direction opposite to the air flow direction during the air diffusion treatment in each of the plurality of air ejection holes 30a. As a result, both the inside of each air diffusion pipe 30 and the plurality of air ejection holes 30a are cleaned.

(Third cleaning method)
In the third cleaning method, one of the two unions 43a and 44a is removed, the valve on the other union side is set to a closed state, and tap water is supplied by connecting a water pipe to one union. It is a method of injecting. For example, after the union 43a is removed and the second opening/closing valve 44 is closed, a tap water pipe is connected to the union 43a to inject tap water. As a result, the tap water that has flowed into the pipes of the air diffusion pipes 30 from the union 43a side flows out from the union 44a side after flowing through the pipes. At this time, the inside of each air diffuser pipe 30 is washed with water.

(Fourth cleaning method)
A fourth cleaning method is to remove both of the two unions 43a and 44a, connect a tap water pipe to one of the unions, and inject tap water. For example, tap water is injected by connecting a water pipe to the union 43a. As a result, the tap water that has flowed into the pipes of the air diffusion pipes 30 from the union 43a side flows out from the union 44a side after flowing through the pipes. At this time, the inside of each air diffuser pipe 30 is washed with water.

(Fifth cleaning method)
A fifth cleaning method is a method of removing both of the two unions 43a and 44a, attaching another part to one union 43a, for example, and inhaling from the other union 44a side with a self-priming pump. As a result, the tap water that has flowed from the union 43a side into the pipes of the air diffusion pipes 30 flows through the pipes toward the union 44a side. At this time, the inside of each air diffuser pipe 30 is washed with water.

According to the first embodiment described above, the following effects are obtained.

The air diffusion pipe 30 of the air diffusion device 10 has a first bent pipe portion 31 and a second bent pipe portion 32 having a plurality of air ejection holes 30a, which are connected in series at 31a and 32a at one end of each without branching. It is Further, the first bent pipe portion 31 and the second bent pipe portion 32 form an air diffusion plane A along the stored liquid surface W of the water to be treated. The air supply header pipe 20 is connected to the first bent pipe portion 31 of the air diffuser pipe 30 via the first connecting pipe 41, and is connected to the second bent pipe portion 32 of the air diffuser pipe 30 via the second connecting pipe 42. It is

Therefore, when the air diffusion process is performed, both the first opening/closing valve 43 and the second opening/closing valve 44 are opened so that the air diffuser 30 is connected to the first bent pipe portion through the first connecting pipe 41 and the second connecting pipe 42 . Air can be fed in from both sides of 31 and the second bent tube portion 32 .

At this time, the first bent pipe portion 31 and the second bent pipe portion 32 of the air diffusion pipe 30 form an air diffusion plane A along the stored liquid surface W, so that the third region 113 in the septic tank 101 during the air diffusion treatment It becomes possible to disperse air over a wide range of. Moreover, in the diffuser pipe 30, the flow direction of the air flowing from the first connecting pipe 41 into the first bent pipe portion 31 and the flow direction of the air flowing from the second connecting pipe 42 into the second bent pipe portion 32 are different from each other. Since the relationship is reversed, the difference in diffusion air volume between the air ejection hole 30a positioned most upstream in the inflow direction and the air ejection hole 30a positioned most downstream among the plurality of air ejection holes 30a is reduced. Therefore, it becomes difficult to block any of the air ejection holes 30a. For this reason, it is possible to diffuse the wide area of the third region 113 in a well-balanced manner using the entire diffuser tube 30 .

Therefore, according to Embodiment 1, it is possible to provide the air diffuser 10 and the air diffusion method with excellent air diffusion processing performance.

According to the air diffuser 10 described above, the first connecting pipe 41 and the second connecting pipe 42 are connected to the manhole opening 105 through the manhole opening 105 using the respective vertical pipe portions 41a and 42a without using bent pipe portions or the like. It can be routed to the outside, and the structures of the first connecting pipe 41 and the second connecting pipe 42 can be simplified.

According to the air diffuser 10 described above, the vertical pipe portions 41a and 42a of the first connecting pipe 41 and the second connecting pipe 42 can be fixed using the support opening edge portion 105b of the manhole opening 105. can.

According to the air diffuser 10 described above, by preventing clogging of the air ejection holes 30 a of the air diffuser 30 , it becomes difficult to remove the contact filter bed 117 from the septic tank 101 for cleaning the air diffuser 30 .

Other embodiments related to the first embodiment described above will be described below with reference to the drawings. In other embodiments, the same reference numerals are given to the same elements as those of the first embodiment, and the description of the same elements will be omitted.

(Embodiment 2)
As shown in FIG. 8, the diffuser 10A of the second embodiment differs from the diffuser 10 of the first embodiment in the respective configurations of the first connecting pipe 41 and the second connecting pipe 42. .

In this air diffuser 10A, the first connecting pipe 41 and the second connecting pipe 42 are connected to the air supply header pipe 20 at a joint pipe portion 45 where they are merged with each other. is provided. The dual-purpose opening/closing valve 46 is configured as an opening/closing valve that is also used as the first opening/closing valve 43 and the second opening/closing valve 44 of the first embodiment.

Other configurations are the same as those of the first embodiment.

According to the air diffuser 10A of Embodiment 2, the first connecting pipe 41 and the second connecting pipe 42 are merged at the confluence pipe portion 45, and the number of opening/closing valves is reduced. It is possible to keep the device cost low compared to .

In addition, the same effects as those of the first embodiment are obtained.

(Embodiment 3)
As shown in FIG. 9, the air diffuser 130 of the air diffuser 10B of Embodiment 3 matches that of the air diffuser 30 of the air diffuser 10 of Embodiment 1 in that it has a unicursal shape. However, it is different from the diffuser tube 30 in terms of the planar view shape.

In a plan view of the diffuser pipe 130 viewed from above in the third direction Z, the outer dimensions of the first curved pipe portion 31 gradually decrease from the other end portion 31b, starting from the other end portion 31b. It extends clockwise like a spiral. On the other hand, the second curved tube portion 32 extends counterclockwise like a spiral from the other end 32b so that the external dimensions gradually increase from the other end 32b. . The diffuser pipe 130 has a spiral shape by joining one end portion 31a of the first curved pipe portion 31 and one end portion 32a of the second curved pipe portion 32 .

Other configurations are the same as those of the first embodiment.

According to the third embodiment, it is possible to realize the air diffuser 10B including the air diffuser 130 having a shape different from that of the air diffuser 30 of the first embodiment.

In addition, the same effects as those of the first embodiment are obtained.

As a modification particularly related to the third embodiment, a structure in which the air diffuser 130 of the air diffuser 10B is applied to the air diffuser 10A of the second embodiment can also be adopted.

The present invention is not limited to the above-described embodiments, and various applications and modifications are conceivable without departing from the object of the present invention. For example, it is also possible to implement the following forms that apply the above-described embodiments.

In the above-described embodiments, the air diffusers 10, 10A, and 10B provided with two air diffusers were exemplified, but the number of air diffusers is not limited to two, and may be one or three or more as needed. can also be In addition, as long as the air diffuser has a unicursal shape, it is not limited to the shape of the air diffuser 30 in FIG. 4 or the air diffuser 130 in FIG. 9, and various shapes can be adopted as necessary. be able to.

In the above-described embodiments, the air diffusers 10, 10A, and 10B attached to the septic tank 101 equipped with the contaminant removal tank, the anaerobic filter tank, the contact filter tank, the treatment tank, and the disinfection tank were exemplified. Of course, the treatment tank to which 10, 10A and 10B are attached is not limited to the septic tank 101 described above. Aeration devices 10, 10A, and 10B can be attached to various processing tanks that require aeration. At this time, the liquid to be treated stored in the treatment tank may be water such as the water to be treated in the septic tank 101, or may be a liquid other than water.

10, 10A, 10B air diffuser 20 air supply header pipe 21 blower (air supply source)
30 air diffusion pipe 30a air ejection hole 31 first bent pipe portion 31a, 32a one end portion 31b, 32b other end portion 32 second bent pipe portion 41 first connection pipe 41a, 42a vertical pipe portion 42 second connection pipe
43 First opening/closing valve 44 Second opening/closing valve 45 Combined pipe portion 46 Dual-use opening/closing valve 101 Septic tank (treatment tank)
105 manhole opening 105a opening edge portion 105b opening edge portion for support (opening edge portion)
117 contact filter (fixed bed)
A Diffusion plane B Projection plane W Retained liquid surface Z Third direction (height direction)

Claims (6)

An air diffuser for sending air into a liquid to be treated stored in a treatment tank,
an air header tube connected to an air supply;
having a first curved pipe portion and a second curved pipe portion provided with a plurality of air ejection holes, wherein the first curved pipe portion and the second curved pipe portion are connected in series at respective one ends; an air diffusion pipe forming an air diffusion plane along the surface of the liquid to be treated;
a first connection pipe that connects the air supply header pipe and the other end of the first curved pipe portion via a first opening/closing valve;
a second connection pipe that connects the air supply header pipe and the other end of the second bent pipe portion via a second opening/closing valve;
with
By opening both the first on-off valve and the second on-off valve while the air diffusion pipe is immersed in the liquid to be treated in the treatment tank during the aeration treatment, the first connection pipe and the second connection pipe are opened. An air diffuser configured such that air is sent into the diffuser pipe from both sides of the first bent pipe portion and the second bent pipe portion through a connecting pipe. The aeration pipe is arranged at a position lower than the manhole opening in the height direction of the treatment tank, and both the first connection pipe and the second connection pipe are straight in the height direction within the projection plane of the manhole opening. 2. The air diffuser of claim 1, having a longitudinally extending tubular portion. The manhole opening has a rectangular opening shape formed by four opening edge portions in a plan view in the height direction, and the vertical pipe portion of each of the first connecting pipe and the second connecting pipe has 3. The support opening edge of claim 2 arranged along and fixed to said support opening edge of any one of said four opening edges of Air diffuser. The first connecting pipe and the second connecting pipe are connected to the air supply header pipe at a joint pipe portion where they are merged with each other, and the joint pipe portion is also used as the first opening and closing valve and the second opening and closing valve. The air diffuser according to any one of claims 1 to 3, wherein one dual-purpose opening and closing valve is provided. The air diffuser according to any one of claims 1 to 4, wherein the diffuser pipe is configured to be arranged below a fixed bed that is fixed in the tank of the treatment tank. An aeration method for sending air into a liquid to be treated stored in a treatment tank,
An air supply header pipe connected to an air supply source, and a first curved pipe portion and a second curved pipe portion provided with a plurality of air ejection holes, wherein The air diffuser pipes, which are connected in series with each other at one end and form an air diffusion plane along the surface of the liquid to be treated, and the air supply header pipe and the other end of the first bent pipe portion a first connecting pipe connecting via one opening/closing valve; and a second connecting pipe connecting the air supply header pipe and the other end of the second bent pipe portion via a second opening/closing valve. a preparation step of preparing the air device;
By opening both the first opening/closing valve and the second opening/closing valve in a state in which the air diffusion pipe of the air diffuser is immersed in the liquid to be treated in the treatment tank, the first connection pipe and the second connection pipe are opened. an air diffusion treatment step of feeding air from both sides of the first bent pipe portion and the second bent pipe portion into the diffuser pipe through a connecting pipe;
Aeration method.

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