JPS6044093A - Aeration apparatus - Google Patents

Abstract

PURPOSE:To prevent the generation of clogging in an aeration apparatus, by providing such a mechanism that sewage is prevented from flowing into the main body of a container by a ball valve when compressed air is sent into the container main body of the aeration apparatus to perform air diffusion. CONSTITUTION:When compressed air is introduced into the air chamber 22 of a container main body 21 from the branched pipe 12 of a compressed air supply pipe through an introducing port 23 and diffused throughout sewage by an air diffusing member 26, a ball valve 29 closes a discharge port 25. When sewage invaded into the air chamber 22 through the air diffusing member 26 during the stoppage of aeration, the ball valve 29 floats. When aeration is again started and compressed air enters the air chamber 22, because of the flotation of the ball valve 29, the sewage in the air chamber 22 is flowed out from the discharge port 25 against the force of the spring 32 of a check valve 30 and the ball valve 29 is fallen to close the discharge port 25. Subsequently, the pressure in the air chamber 22 rises and air is diffused into sewage from the fine pores of the air diffusing member 26.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an aeration device used for sewage treatment and the like.

Aeration purification is performed as a purification treatment for wastewater such as sewage and wastewater. That is, by sending air into the sewage stored in the sludge tank from an aeration device installed in the sludge tank, the organic matter in the sewage that has adhered or adsorbed to the activated sludge is oxidized (
It is purified by being absorbed by active bacteria. In such aeration purification, how widely and finely the air is diffused within the sludge tank is a factor that determines the quality of the treatment efficiency.

Various proposals have been made regarding this type of aeration equipment.
For example, as shown in FIG. 1, an aeration tube 2 connected to a pressurized air supply pipe through a joint 1 is constructed of a porous member made of synthetic resin or the like. This is effective because it can perform fine aeration, but when the aeration is stopped, sewage flows into the aeration pipe, and this inflowing sewage must be filled with air at a pressure 10 times or more higher than normal aeration. However, if you attempt to discharge this wastewater using air that is slightly higher than the pressure used during normal aeration, it will not only take a very long time, but it will also be difficult to completely drain the wastewater that has flowed into the aeration pipe. There is a problem that it is difficult and worsens the aeration situation. In addition, when the aeration is stopped, the sewage that flows into the aeration pipe has a high water head because the water head stored in the sludge tank is large, so the flow rate is high, and the solid content in the sewage breaks up flocs and enters the aeration pipe. When the wastewater that has flowed into the aeration pipe is discharged using pressurized air, the outflow speed is small, so the aeration pipe acts as a filter, and the solid content, which is the re-agglomeration of flocs in the wastewater, is transferred to the inner surface due to the filter effect of the aeration pipe. Also, there is a problem that it adheres to the pores and causes clogging, which worsens the air diffusion situation.

For this reason, it has been impossible to use a porous member with a preferable pore size in terms of oxygen absorption efficiency.

In order to solve this problem, the upper end opening of the cup-shaped container body 3 is closed with a lid plate 4 to form an air chamber 5 inside the container body.

A connecting member 6 having a spout 6a connected to a pressurized air inlet 3a provided at the lower end of the container body 3 is installed upright in the air chamber 5 through the lid plate 4, and the connecting member 6 and the lid are installed upright in the air chamber 5. An elastic member 7 such as a disc spring is disposed between the plate 4 and the pressure of the air flowing from the pressurized air supply pipe 8 through the pressurized air inlet 3a and the connecting member 6 into the air chamber 5 from the ejection port 6a during aeration. , the cover plate 4 is opened against the elastic force of the elastic member 7 to diffuse air into the waste water, and when the pressure inside the air chamber 5 decreases when the aeration is stopped, the cover plate 4 is opened by the elastic force of the elastic member 7 to open the container body. 3
Utility Model Application No. 55-46520 proposed an aeration device that was seated on one end of the air chamber 5 to prevent sewage from flowing into the air chamber 5. However, it is difficult to uniformly apply the elastic force of the elastic member 7 to the entire cover plate 4;
The lid plate 4 may tilt when opened due to the pressure inside the air chamber 5, causing problems such as one-sided blowing and forming large air bubbles that reduce air diffusion efficiency, and also generate abnormal noise when the lid plate 4 is seated. There is also the problem of doing so.

The present invention was devised in view of the above-mentioned drawbacks of the conventional ones, and its purpose is to easily discharge sewage that has entered the air chamber of the container body through the porous diffuser into the sludge tank during aeration. It is an object of the present invention to provide an aeration device that can perform fine aeration at all times without causing clogging, and that does not generate abnormal noise.

The gist of the present invention is to provide a container main body having an air chamber with an open upper end, an air diffuser made of a porous material attached to the upper end of the container main body and covering the opening, and an air diffuser provided in the container main body to allow air to flow through the container main body. a pressurized air inlet that communicates with the chamber and connects to a pressurized air supply pipe; an outlet for infiltrated sewage that is provided at the bottom of the container body and communicates with the air chamber; and a member that floats in the sewage and is disposed within the air chamber The aeration device is equipped with a valve that opens and closes a discharge port for infiltrated sewage.

Hereinafter, the present invention will be specifically explained based on illustrated embodiments.

FIGS. 3 to 5 show an embodiment of the aeration apparatus according to the present invention, and in the figures, 10 is a main pipe of a pressurized air supply pipe whose one end is connected to a blower (not shown), and 11 is the main pipe 10. 12 is a branch pipe connected to the collecting pipe 11, and 20 is an aeration device attached to the branch pipe 12, which is usually installed in an aeration tank containing activated sludge. A detailed explanation will be given below based on FIGS. 4 and 5.

Reference numeral 21 denotes a container body formed in a conical shape from synthetic resin, and is provided with an air chamber 22 with an open top end. A connecting part 24 having a pressurized air inlet 23 communicating with the air chamber 22 is formed integrally with the main body 21 at the upper side wall of the container body 21, and a screw 24 provided at the end of the connecting part 24 is formed integrally with the main body 21.
a is an acid thread 12 formed in the branch pipe 12 of the pressurized air supply pipe;
By screwing into a, the container main body 21 is connected to a branch pipe of the pressurized air supply pipe. In addition, the container body 21
An exhaust port 25 communicating with the air chamber 22 is provided at the lower end.

Reference numeral 26 denotes an air diffuser that is attached to the upper end of the container body 21 and covers the opening, and is made of a porous material formed by sintering or foaming synthetic resin, etc., and the surrounding area is formed at the upper end of the container body 21. It is attached to the flange 21a by several ports 27 and nuts 28. Note that the diameter of the pores of the porous material constituting the air diffuser 26 is 20 colors to O,
About 5g is desirable.

Reference numeral 29 designates a ball valve disposed in the air chamber 22, which is made of a synthetic resin such as polyethylene or polypropylene that has a specific gravity smaller than that of water. The discharge port 25 is closed,
When dirty water is flowing into the air chamber 22, it floats on the dirty water and opens the discharge port 25. It should be noted that the valve 29 may be made of a material having a specific gravity greater than that of water, as long as it is made hollow so that it floats on the dirty water.

Reference numeral 30 denotes a check valve disposed at the lower end of the container body 21 facing the discharge port 25, one end of which is rotatably connected to the container body 21 by a shaft 31, and one end of which is rotatably connected to the container body 21 by a shaft 31; 3
1 and whose other end engages with the lower surface, the spring 32 is always urged to rotate counterclockwise in the figure with the shaft 31 as a fulcrum, and the outflow of sewage from the air chamber 22 is prevented. However, the inflow of sewage from the aeration tank to the air chamber 21 is blocked. Note that a sealing material 30a with good sealing properties, such as rubber, is attached to the upper surface of the check valve 30.

The present embodiment is configured as described above, and its operation will be explained below.

When the air chamber 22 of the container body 21 is filled with air (aeration is in operation), the ball valve 29 falls as shown and closes the outlet 25, causing the branch of the pressure air supply pipe to close. When pressure air is introduced into the air chamber 22 from the pipe 12 through the pressure air introduction port 23, the pressure air is diffused into the sewage water of the sludge tank through the numerous fine holes of the air diffusion member 26.

Next, when the aeration is stopped, the pressure in the air chamber 22 becomes approximately atmospheric pressure, so the sewage in the sludge tank enters the air chamber through the fine holes of the aeration member 26. Therefore, the ball valve 29 floats above the waste water. At this point, aeration is started again and the air chamber 22
When pressurized air is introduced into the chamber, the discharge port 25 is opened with the ball valve 29 floating, so that the dirty water flowing into the air chamber 22 due to the pressure of the air is discharged from the discharge r 325 and the check valve 30 is removed by the force of the spring 32. The sludge is forced open against the pressure and flows into the sludge tank. When the amount of sewage in the air chamber 22 becomes small, the ball valve 29 is caught up in the outflow vortex of the sewage and rapidly falls to close the outlet z5, so the pressure in the air chamber 22 increases.
Air is diffused into the sludge tank through the fine holes of the aeration member 26. Note that when the waste water that has flowed into the air chamber 22 is discharged from the discharge port 25 and the ball valve 29 closes the discharge port 25, the pressure inside the air chamber 22 does not act on the check valve 30.
is rotated counterclockwise in the figure about the shaft 31 by the force of the spring 32 to close the discharge port 25 and block the inflow of waste water from the discharge port 25 into the air chamber 22.

FIG. 6 shows another embodiment of the aeration device according to the present invention, in which the same parts as in the above embodiment are given the same reference numerals.

The aeration system M20 of FIG. 6 according to this embodiment has a pressure air introduction port 23 that communicates with an air chamber 22 provided in a container body 21.
A check valve 40 having one end attached to the inner surface of the container body 21 with a screw 41 is disposed. The check valve 40
is made of an elastic member such as rubber, synthetic resin, or spring steel, and allows pressurized air to flow into the air chamber 22 from the pressurized air supply pipe side, but prevents fluid from flowing out from the air chamber 22 to the pressurized air supply pipe side. It is designed to be blocked. Therefore, the dirty water that has flowed into the air chamber 22 can be prevented from flowing into the pressurized air supply pipe.

Further, in the aeration device 20 according to this embodiment, the aeration member 261 made of a porous material and attached to the upper end of the container body 21 is formed in a curved shape, compared to the flat aeration member 26 of the above embodiment. This has the effect of being able to diffuse air over a wide area.

FIG. 7 shows still another embodiment of the storm aeration device according to the present invention, in which the same parts as in the above embodiment are given the same reference numerals.

The aeration device 20 according to the present embodiment includes a pressurized air introduction pipe connecting portion 210 that is formed downward in the container body 21 and has a screw hole 210a on the inner periphery, and is integrally configured with the main body 21. The male screw 90a formed on the outer periphery of the pressure air introduction pipe 90 is screwed into the hole 210a so that the upper end is connected to the container body 21.
It is installed so that it is located in the northern part of the air chamber 22. The pressurized air introduction pipe 90 has a road 91 in the center,
At its upper end is a pressurized air inlet 9'1 communicating with the passage 91.
a, and a cup-shaped check valve 401 made of an accessible member such as rubber is attached to the pressure air introduction port 91a,
-1 one end portion is fixed by a tightening ring 402. When pressure is introduced into the air chamber 22 from the pressure air introduction port 91a, the lower end of the check valve 401 is pushed wide to allow the pressure air to flow into the air chamber 22. The outflow of the fluid to the introduction v90 side is blocked, and it is possible to prevent the dirty water that has flowed into the air chamber 22 from flowing into the pressurized air introduction pipe 90. In addition, the lower end of the pressure air introduction pipe 90 is attached so as to protrude downward from the connecting portion 210 formed in the container body 21, and is fitted with a lock nut 9.
2 fixes the position relative to the connecting portion 210, and by screwing the lower end of the lock nut 92 into the pressurized air supply pipe, the aeration device 20 can be attached to the pressurized air supply pipe.

Therefore, according to this embodiment, the pressurized air introduction pipe 90 attached to the container body 21 can be screwed onto the pressurized air supply pipe from above, so that the installation is easy, and
This has advantages such as ease of operation (positioning is free) during installation.

In addition, the aeration device 20 according to this embodiment is equipped with a check valve 301 made of an accessible member such as rubber on the discharge r 325 provided at the lower part of the container body 21.
1 has a plurality of openings 301 at positions not facing the discharge port 25.
a is provided, and when the pressure from the air acts on the sewage in the air chamber 22, the check valve 301 is pushed and bent (opened), and the discharge port 25 and the opening 301a communicate with each other, preventing the sewage from flowing into the sludge tank. However, the flow of sewage from the sludge tank into the air chamber 22 is blocked, and the check valve 301 has a simpler structure and assembly than the check valve 30 shown in the above embodiment. Easy to attach.

The present invention has been explained above based on the illustrated embodiments.
According to the invention, an air diffuser made of a porous material is attached to the upper end of a container body having an air chamber with an open upper end, and pressurized air is introduced into the air chamber from a pressurized air introduction port connected to a pressurized air supply pipe. Since the air is diffused through the fine holes in the air diffuser,
Fine aeration can be uniformly performed and efficient aeration can be performed. In addition, a discharge port is provided at the bottom of the container body, and a valve made of a member that floats in the waste water is installed in the air chamber, so that the waste water that has entered through the aeration member during the aeration stop will be discharged during the next aeration. Since it is discharged through the outlet, the wastewater that has flowed into the air chamber can be discharged in a very short period of time, and since the wastewater that has flowed into the air chamber is not discharged from the air diffuser, clogging of the air diffuser can be prevented. This allows for good aeration over a long period of time.

Further, according to the second invention, since the valve is disposed in the discharge port provided in the container body in an inverted 1 configuration that allows wastewater to flow out from the air chamber but blocks wastewater from flowing into the air chamber, Except when discharging wastewater that has flowed into the air chamber, the outlet is shut off by the reverse IF valve to prevent wastewater from flowing into the air chamber from the outlet, allowing unfiltered wastewater to flow directly into the air chamber. This prevents staining and clogging of the air chamber and the air diffuser.

According to the third invention, a check valve is provided in the pressurized air inlet provided in the container body to allow the inflow of pressurized air into the air chamber, but to block the outflow of sewage from the air chamber to the pressurized air supply pipe side. Because of this arrangement, it is possible to prevent sewage that has flowed into the air chamber from flowing back into the pressurized air supply pipe.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view showing an example of a conventionally used aeration device, Fig. 2 is a cutaway perspective view showing another example of a conventionally proposed aeration device, and Fig. 3 is a cross-sectional view of an aeration device according to the present invention. FIG. 4 is a sectional view showing an embodiment of the aeration device according to the present invention; FIG. 5 is a sectional view taken along line V-v in FIG. 4; FIGS. 6 and 7. FIG. 3 is a sectional view showing another embodiment of the present invention. 20: Aeration device 21: Container body 22: Air chamber 23: Pressure air introduction rotor 5 second outlet 26: Diffusion member 29: Ball valve 30: Check valve 40: For check valve Application
Representative of Cellpol Industries Co., Ltd. Patent attorney Minoru Tsuji (1 other person) 5 Fig. 7 2TA Fig. 3 Fig. 4 Y5 Fig. 7-6 zo Fig. 7 9θ

Claims (1)

[Scope of Claims] ■) A container body having an air chamber with an open upper end, an air diffuser made of a porous material attached to the upper end of the container body and covering the opening, and an air chamber provided in the container body. a pressurized air inlet that communicates with the air chamber and connects to the pressurized air supply pipe; an outlet for infiltrated sewage that is provided at the bottom of the container body and communicates with the air chamber; An aeration device equipped with a valve that opens and closes the outlet. 2. In the aeration device as set forth in claim 1, an inverse 1 is disposed at the discharge port provided in the container body, and allows sewage to flow out from the air chamber, but blocks sewage from flowing into the air chamber.
]—Aeration device with valve.・3) Claim 1
In the aeration device described in item 1 or 2, the aeration device is arranged at the pressurized air inlet provided in the container body and allows pressurized air to flow into the air chamber, but blocks the outflow of sewage from the air chamber to the pressurized air supply pipe side. Aeration device with check valve.