JPH1066987A - Air diffuser of septic tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the clogging of a diffuser hole with sludge by forming plural diffuser holes in a diffuser pipe formed by a flexible body, supplying air to the diffuser pipe which is inflated to inject the air from the holes and stopping the air supply to deflate the diffuser pipe to close the holes. SOLUTION: A liq. mixture of activated sludge and sewage is stored in an aeration tank 3, and an air diffuser consisting of a diffuser pipe 1 formed by a flexible body is arranged below a membrane separator. When aeration is conducted, air is supplied to the diffuser from a blower 6 outside the aeration tank through an air feed pipe 5 and injected into the liq. mixture from a diffuser hole 2 to dissolve oxygen. A cleaning circulating current is generated to clean the membrane separator 4. Meanwhile, when aeration is stopped, the supply of air to the diffuser pipe 1 is stopped, the diffuser pipe 1 is deflated and flattened to close the diffuser hole 2 with the inner wall of the pipe 1, hence the activated sludge does not intrude into the pipe 1, and the clogging of the hole 2 with the sludge is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a diffuser for a septic tank.

[0002]

2. Description of the Related Art As a conventional example, as shown in FIG. 9, oxygen is dissolved in a mixed solution of activated sludge and raw water stored in an aeration tank 101, and a washing circulation of a membrane separation device is generated. Therefore, the air diffuser 10 is provided at the bottom of the aeration tank 101.
2 are installed. The air diffuser 102 is composed of a polyvinyl chloride pipe or the like. A plurality of air diffusers 103 having a diameter of several millimeters are formed at the bottom of the air diffuser 102 at the bottom thereof. Is in communication with
In the membrane separation type purification of nitrogen removal, nitrogen is removed by intermittently aerating.

[0003]

However, in the conventional example, when the air diffusion is stopped, the mixed liquid of the activated sludge and the raw water flows into the air diffusion device 102 through the air diffusion holes 103.
Accordingly, in the activated sludge method, since the concentration of the sludge is particularly high, clogging of the air diffuser 102 is remarkable, which causes a reduction in the life of the membrane and a reduction in purification performance. In order to prevent the air diffuser 102 from being clogged, it is desirable to increase the size of the air diffusion holes 103. However, if the size of the air diffusion holes 103 is increased, the air diffusion efficiency decreases. In addition, even if the diffuser holes 103 are enlarged, it is not possible to prevent the diffuser holes 103 from being blocked.

On the other hand, a diffuser tube with a check mechanism in which a rubber film having a number of slits is opened and closed by air pressure is known, but the dynamic differential pressure is as large as 0.05 kgf / cm ² ,
There is a problem that 5 is burdensome. The present invention has been made in view of this point, and when the aeration is stopped, the sludge in the aeration tank does not flow into the diffusion device, and therefore, the purification tank that can prevent the clogging of the diffusion holes by the sludge can be prevented. It is an object to provide a diffuser.

[0005]

According to a first aspect of the present invention, there is provided an air diffuser for a septic tank having an air diffuser formed of a flexible body, a plurality of air diffuser holes formed in the air diffuser, and an air diffuser formed in the air diffuser. When air is supplied, the diffuser tube expands and blows out air from the diffuser holes,
When the supply of air is stopped, the air diffuser is contracted flat by water pressure, and the air diffuser is closed by the inner wall of the air diffuser.

According to a second aspect of the present invention, there is provided a diffuser for a septic tank according to the first aspect of the present invention, wherein the diffuser is housed in a diffuser case, and the diffuser is diffused from an inner surface of the diffuser case. It is characterized in that a spring for compressing a portion without pores is provided.

According to a third aspect of the present invention, there is provided an air diffuser for a septic tank according to the first aspect of the present invention, wherein the diffuser tube and the elastic tube are accommodated in a diffuser tube case, and are provided along a lower portion of the air diffuser tube. The elastic tube is also arranged.

According to a fourth aspect of the present invention, there is provided an air diffuser for a septic tank according to the first aspect of the present invention, wherein a rigid pipe is arranged along the inner peripheral surface of the air diffuser. An opening which does not communicate with the air diffusing hole is formed.

According to a fifth aspect of the present invention, there is provided an air diffuser for a septic tank according to the fourth aspect, wherein the inner peripheral surface of the air diffuser which is in contact with the opening of the rigid pipe does not communicate with the air diffuser hole. It is characterized by forming a recess.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a configuration diagram showing a use state of a diffuser for a septic tank according to a first embodiment of the present invention.
FIG. 2 is a cross-sectional view of an air diffuser tube used in the air diffuser of the septic tank according to the embodiment, FIG. 2 (a) shows a state at the time of aeration, and FIG. , Shows the state at the time of stopping the aeration.

As shown in FIG. 1, the air diffuser of this septic tank comprises an air diffuser tube 1 formed of a flexible body. They are formed so as to be separated from each other. When air is supplied to the air diffuser 1, the air diffuser 1 expands and ejects air from the air diffuser,
When the supply of air is stopped, it is made of a flexible body which contracts flat by water pressure and is closed by the inner wall of the diffuser tube 1 and the diffuser hole 2 is made of rubber (EPDM or the like). The pore diameter of the pore 2 is 3 mm.

Hereinafter, the air diffuser of the septic tank will be described in detail with reference to FIGS. 1 and 2. As shown in FIG. 1, a mixed solution of activated sludge and sewage is stored in an aeration tank 3, and a membrane separation device 4 is disposed.
An air diffusion device including an air diffusion tube 1 is disposed below the air diffusion device.

When aeration is performed, air is supplied from a blower 6 outside the aeration tank 3 to the aeration device via an air supply pipe 5, and the air is supplied from a diffusion hole 2 to a mixed solution of activated sludge and sewage. To dissolve oxygen and to separate the membrane
Is generated, and the membrane separation device 4 is washed.

On the other hand, a mixture of activated sludge and sewage is filtered by a membrane suction pump 7 and sent to a disinfection tank or the like as treated water. Nitrogen is removed by intermittent aeration. That is, during aeration, the inside of the aeration tank 3 becomes an aerobic atmosphere, and the nitrification reaction is performed. When the aeration is stopped, the inside of the aeration tank 3 becomes an anaerobic atmosphere, and a denitrification reaction is performed. Therefore, the nitrification reaction and the denitrification reaction are alternately repeated by intermittent aeration.

At the time of aeration, air is supplied to the air diffuser, the air diffuser 1 keeps a cylindrical shape by the discharge pressure of the blower 6, and the air is blown out from the air diffuser 2 into the mixed liquid of activated sludge and sewage. I do. This state is shown in FIG. Regarding the discharge pressure of the blower 6, the head pressure at a water depth of 1.6 m of the air diffuser is about 0.016 kgf / cm ² , and aeration is possible at a low pressure.

On the other hand, when the aeration is stopped, the supply of air to the air diffuser 1 is stopped, the air diffuser 1 contracts flatly due to the water pressure, the air diffuser 2 is closed by the inner wall of the air diffuser 1, and the air diffuser 1 is closed. Since activated sludge and the like do not enter inside, it is possible to prevent the air diffusion holes 2 from being blocked by the sludge. This state is shown in FIG.
It is shown in (b).

FIG. 3 is a cross-sectional view of an air diffuser tube used in an air diffuser for a septic tank according to a second embodiment of the present invention.
FIG. 3A shows a state at the time of aeration, and FIG.
(B) shows the state at the time of stopping the aeration.

As shown in FIG. 3, the difference between the diffuser of the septic tank and the diffuser of the septic tank shown in FIGS. 1 and 2 is that the diffuser tube 1 is accommodated in a diffuser tube case 8 and The point is that a spring 9 is provided to compress a portion of the air diffuser tube 1 without the air diffusion hole 2 from the inner surface of the trachea case 8. Other configurations are the same as those of the air diffuser of the septic tank shown in FIGS.

As shown in FIG. 3, the diffuser case 8
Is formed in a quadrangular cylindrical shape, and diffuser auxiliary holes 10 are respectively formed at positions corresponding to the diffuser holes 2 so that the diffuser tube case 8 does not block the diffuser holes 2. Further, a spring 9 is arranged between the lower outer surface of the air diffuser 1 having no air diffusion holes 2 and the bottom surface of the air diffuser case 8, and the spring 9 is housed in the air diffuser case 8 together with the air diffuser 1. The pressing force of the spring 9 is set to such an extent that the air diffuser 1 is not deformed during aeration.

In this case, at the time of aeration, air is supplied to the air diffuser, and the diffuser tube 1 maintains a cylindrical shape by the discharge pressure of the blower 6, compresses the spring 9, and activates the activated sludge from the air diffuser hole 2. Air is spouted into the mixture of water and sewage. This state is shown in FIG.

On the other hand, when the aeration is stopped, the air diffuser 1 is quickly compressed flat by the pressing force of the spring 9. Thereby, the air diffuser 2 is closed by the inner wall of the diffuser 1, and the activated sludge or the like does not enter the inside of the diffuser 1, so that the air diffuser 2 can be prevented from being blocked by the sludge. In this case, since the air diffuser 1 is compressed flat by the pressing force of the spring 9, the responsiveness is better than in the case of FIG. 1 and the reliability is higher. This state is shown in FIG.

FIG. 4 is a configuration diagram showing a use state of the air diffuser of the septic tank according to the third embodiment of the present invention. FIG.
It is sectional drawing of the air diffuser of the septic tank which is the same embodiment, FIG.5 (a) shows the state at the time of aeration, FIG.
(B) shows the state at the time of stopping the aeration.

As shown in FIGS. 4 and 5, the difference between the diffuser of the septic tank and the diffuser of the septic tank shown in FIGS. 1 and 2 is that the diffuser 1 and the elastic pipe 11 are diffused. The elastic tube 11 is accommodated in the trachea case 8 and arranged along the lower part of the air diffuser 1. Other configurations are shown in FIGS.
Is similar to the air diffuser of the septic tank shown in FIG.

As shown in FIG. 5, the elastic tube 11 has a cylindrical shape and is expandable and contractible, and is made of rubber (EPDM).
Etc.) can be used. As shown in FIG.
The air diffuser 1 and the elastic tube 11 are connected via a three-way valve 12, and when the direction A in FIG. 4 is switched, that is, air is supplied to the air diffuser 1 during aeration, and when the direction B in FIG. That is, air is supplied to the elastic tube 11 when the aeration is stopped.

When air is supplied to the air diffuser 1, the air diffuser 1 retains a cylindrical shape by the discharge pressure of the blower 6, and the air flows from the air diffuser 2 into the mixed liquid of activated sludge and sewage. Squirt. At this time, the elastic tube 11 is compressed flat. This state is shown in FIG.

On the other hand, when the air supply to the elastic tube 11 is stopped, the elastic tube 11 expands and the air diffuser 1
Is quickly compressed flat while exhausting residual air. This state is shown in FIG.

Thus, since the diffuser hole 2 is closed by the inner wall of the diffuser tube 1 and activated sludge or the like does not enter the inside of the diffuser tube 1, the diffuser hole 2 can be prevented from being blocked by sludge. In this case, since the diffuser tube 1 is compressed flat by the expanded elastic tube 11, the diffuser tube 1 can be compressed more evenly than in the case of FIGS.

FIG. 6 is a partially cutaway front view of a septic tank air diffuser according to a fourth embodiment of the present invention. FIG. 7 is a cross-sectional view of a main part of the air purification device for a septic tank according to the embodiment;
FIG. 7A shows a state at the time of aeration, and FIG.
(B) shows the state at the time of stopping the aeration.

As shown in FIG. 6 and FIG. 7, the difference between the air diffuser of the septic tank and the air diffuser of the septic tank shown in FIG. 1 and FIG. And rigid pipe 1
3 is provided, and an opening 14 that does not communicate with the air diffusing hole 2 is formed in the rigid pipe 13. Other configurations are shown in FIG.
And it is the same as the air diffuser of the septic tank shown in FIG.

As shown in FIGS. 6 and 7, in the air diffuser, a rigid pipe 13 is arranged along the inner peripheral surface of the air diffuser 1 formed of an elastic body. The rigid tube 13 has a cylindrical shape, and the material thereof may be plastic such as polyvinyl chloride, metal, or the like.

Then, an opening 14 is formed in the rigid pipe 13 near the plurality of air diffusion holes 2 formed in the air diffusion pipe 1 so as not to communicate with them. The opening diameter of the opening 14 is set to 10 mm, which is about three times the diameter of the diffuser hole, in order to secure a pressure receiving area and facilitate the expansion of the diffuser tube 1.

In this case, when air is supplied to the air diffuser through the air supply pipe 5 during the aeration, the air is supplied to the rigid pipe 13 and the air is supplied from the opening 14 to the inner wall of the air diffuser 1. Squirts. Thereby, the air diffuser 1 expands, and the air diffuser 1
A gap 15 is formed between the inner wall of the rigid pipe 13 and the opening 14 of the rigid pipe 13, and the air supplied to the rigid pipe 13 passes through the gap 15 and enters the mixed liquid of the activated sludge and the sewage from the air diffusing hole 2. And outflow. This state is shown in FIG.

On the other hand, when the aeration is stopped, the air does not blow out from the opening 14 to the inner wall of the diffuser tube 1, so that the diffuser tube 1 contracts due to water pressure, and the diffuser holes 2 are formed by the outer wall of the rigid tube 13.
Is blocked, and activated sludge or the like does not enter the inside of the air diffuser 1, so that the air diffuser 2 can be prevented from being blocked by the sludge. This state is shown in FIG.

FIG. 8 is a cross-sectional view of a main part of an air diffuser for a septic tank according to a fifth embodiment of the present invention. FIG. 8 (a) shows a state at the time of aeration, and FIG. b) shows the state at the time of stopping the aeration.

The difference between the air diffuser of the septic tank and the air diffuser of the septic tank shown in FIGS. 6 and 7 is that the air diffuser 1 is in contact with the opening 14 of the rigid pipe 13 on the inner peripheral surface of the air diffuser 1. This is a point that a recess 16 not communicating with 2 is formed. Other configurations are the same as those of the air diffuser of the septic tank shown in FIGS. 6 and 7.

In this case, when air is supplied to the diffuser through the air supply pipe 5 during aeration, the air is supplied to the rigid pipe 13 and the air is ejected from the opening 14 to the recess 16. I do. As a result, the air diffuser 1 expands to form a gap 15 between the recess 16 and the opening 14 of the rigid pipe 13,
The air supplied to 3 passes through the gaps 15 and the recesses 16 and flows out of the diffuser holes 2 into a mixture of activated sludge and sewage. This state is shown in FIG.

On the other hand, at the time of stopping the aeration, the air does not blow out from the opening 14 into the recess 16, so that the air diffuser 1 contracts due to the water pressure. Thereby, the diffuser hole 2 is closed by the outer wall of the rigid pipe 13, and the activated sludge or the like does not enter the inside of the diffuser pipe 1, so that the diffuser hole 2 can be prevented from being blocked by the sludge. This state is shown in FIG.

In this case, the recess 1 is formed on the inner peripheral surface of the air diffuser 1.
6 can secure a large pressure receiving area as compared with the case of FIGS.
Is expanded, and the recess 16 also serves as a flow path for air, so that pressure loss can be reduced.

[0039]

According to the first aspect of the present invention, the air diffuser for a septic tank according to the first aspect of the present invention forms the air diffuser with a flexible body. The air diffuser tube contracts flatly, the air diffuser hole is closed by the inner wall of the diffuser tube, and activated sludge or the like does not enter the inside of the diffuser tube, so that the air diffuser hole can be prevented from being blocked by the sludge.

According to a second aspect of the present invention, a septic tank air diffuser is provided in addition to the effect of the first aspect of the present invention.
By providing a spring for compressing the air diffuser, the air diffuser is compressed flat by the pressing force of the spring when the aeration is stopped, so that the response is excellent and the reliability is higher.

According to the third aspect of the present invention, in addition to the effect of the first aspect of the present invention, there is provided a septic tank air diffuser.
By arranging the elastic tube, when the aeration is stopped, the diffuser tube is compressed flat by the expanded elastic tube, so that the diffuser tube can be uniformly compressed.

According to the fourth aspect of the present invention, in addition to the effect of the first aspect of the present invention, there is provided a septic tank air diffuser.
At the time of aeration stop, since air does not blow out from the opening to the inner wall of the diffuser tube, the diffuser tube shrinks due to water pressure, the diffuser hole is closed by the outer wall of the rigid tube, and activated sludge etc. enters the inside of the diffuser tube Therefore, it is possible to prevent the air diffusion holes from being blocked by the sludge.

According to the fifth aspect of the present invention, a diffuser for a septic tank is provided in addition to the effect of the diffuser for a septic tank according to the fourth aspect.
By forming a recess on the inner peripheral surface of the diffuser tube, a relatively large pressure receiving area can be secured, so that the diffuser tube expands more quickly and the recess also serves as a flow path for air, reducing pressure loss. Can be planned.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a use state of an air diffuser for a septic tank according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of an air diffuser used in the air diffuser of the septic tank according to the embodiment, FIG. 2 (a) showing a state of aeration, and FIG. 2 (b). , Shows the state at the time of stopping the aeration.

FIG. 3 is a cross-sectional view of an air diffuser tube used for an air diffuser of a septic tank according to a second embodiment of the present invention, and FIG. 3 (a) shows a state at the time of aeration, and FIG. (B) shows the state at the time of stopping the aeration.

FIG. 4 is a configuration diagram showing a use state of a diffuser for a septic tank according to a third embodiment of the present invention.

FIG. 5 is a cross-sectional view of an air diffuser for a septic tank according to the embodiment, FIG. 5 (a) showing a state during aeration, and FIG. 5 (b) showing a state when the aeration is stopped. It shows the status.

FIG. 6 is a partially broken front view of an air diffuser for a septic tank according to a fourth embodiment of the present invention.

FIG. 7 is a cross-sectional view of a main part of the air diffuser of the septic tank according to the embodiment, FIG. 7 (a) showing a state during aeration, and FIG. It shows the state at the time.

FIG. 8 is a cross-sectional view of a main part of an air diffuser for a septic tank according to a fifth embodiment of the present invention. FIG. 8 (a) shows a state of aeration, and FIG. , Shows the state at the time of stopping the aeration.

FIG. 9 is a configuration diagram showing a conventional example.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 diffuser tube 2 diffuser hole 8 diffuser tube case 9 spring 11 elastic tube 13 rigid tube 14 opening 16 recess

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shin Shin, 1048, Kazuma, Kadoma, Osaka Prefecture Inside Matsushita Electric Works, Ltd.

Claims (5)

[Claims] An air diffusion tube formed of a flexible body is provided, and a plurality of air diffusion holes are formed in the air diffusion tube, and when air is supplied to the air diffusion tube, the air diffusion tube expands and ejects air from the air diffusion hole. The air diffuser is characterized in that when the supply of water is stopped, the air diffuser tube contracts flatly due to water pressure and the air diffuser hole is closed by the inner wall of the diffuser tube. 2. The dispersion of a septic tank according to claim 1, wherein the air diffuser is housed in the air diffuser case, and a spring is provided to compress a portion of the air diffuser having no air diffusion holes from the inner surface of the air diffuser case. Qi device. 3. The air diffuser for a septic tank according to claim 1, wherein the air diffuser and the elastic tube are accommodated in a diffuser tube case, and the elastic tube is arranged along a lower portion of the air diffuser. 4. The dispersion of a septic tank according to claim 1, wherein a rigid pipe is arranged along the inner peripheral surface of the diffuser pipe, and an opening is formed in the rigid pipe so as not to communicate with the diffuser hole. Qi device. 5. The air diffuser for a septic tank according to claim 4, wherein a concave portion not communicating with the air diffusion hole is formed on an inner peripheral surface of the air diffuser tube in contact with the opening of the rigid tube.