JPH08126895A - Air diffuser of aeration tank - Google Patents

Abstract

PURPOSE: To make it possible to uniformly supply air into an aeration tank by moving an air diffusion pipe while releasing air by utilizing the force of the air fed from an air feed pipe. CONSTITUTION: The air diffusion pipe 1 moves back and forth while releasing the air when the energy of the air sent into a bellows pipe 6 through the air feed pipe 4 from an air pump is varied by its intensity. In such a case, the forward and backward movement of the air diffusion pipe 1 while the air is released is made possible in response with the operation of the air pump if the air pump is operated/stopped at specified intervals. At this time, the bellows pipe 6 is prevented from floating by guide rails 7 and the air diffusion pipe 1 moves back and forth in a horizontal direction along the guide rails 7 while releasing the air into the water. Then, the nearly uniform supply of the air to the respective sections in the aeration tank 3 is possible and the dissolved oxygen quantity in the water in the aeration tank 3 is made uniform. The washing capacity of the aeration tank 3 is, therefore, improved. Since the air diffusion pipe 1 is moved by utilizing the force of the air, there is no need for separately installing a driving source.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air diffuser for an aeration tank used as an aeration tank for a septic tank.

[0002]

2. Description of the Related Art In conventional septic tanks, wastewater is generally purified by an activated sludge method in an aeration tank. In this case, aerobic microorganisms that decompose pollutants and propagate therein are present in the aeration tank, and air is supplied to the aeration tank to activate the microorganisms. Therefore, the aeration tank is equipped with an air supply pipe for sending air to the bottom of the aeration tank, and an air diffuser pipe that is ventilated and connected to the tip of the air supply pipe, and discharges air into the water from the air diffuser pipe. Air is supplied into the aeration tank.

[0003]

However, in the conventional aeration tank, since the diffuser pipe is fixed to the bottom of the aeration tank, the amount of dissolved oxygen in the water becomes uneven depending on the location of the aeration tank. Since the activity of microorganisms decreased in the region where the amount of dissolved oxygen was low, the purification ability in the aeration tank was not maximized.

The present invention has been made in view of the above circumstances, and an object thereof is to provide an air diffuser for an aeration tank capable of uniformly supplying air into the aeration tank. .

[0005]

The air diffuser for an aeration tank according to claim 1 of the present invention is an air supply pipe 4 for sending air to the bottom of the aeration tank 3, and an air supply pipe communicating with the air supply pipe 4. 4 is provided with an air diffuser 1 that discharges the air sent from 4 into the water at the bottom of the aeration tank 3, and moves the air diffuser 1 while discharging the air by using the force of the air sent from the air pipe 4. It is characterized by comprising means for making it.

In the aeration device for the aeration tank according to the second aspect of the present invention, the base end of the bellows tube 6 having a self-contracting property at the tip of the air supply tube 4 is used as a means for moving the air diffusion tube 1 while releasing air. Is ventilated and connected, and the air diffuser 1 is ventilated and connected to the tip of the bellows tube 6, and the bellows tube 6 is provided so as to be expandable and contractable in a substantially horizontal direction according to the strength of the air sent from the air feeding tube 4. It is characterized by that.

In this case, the guide rail 7 is placed on the bellows tube 6.
Is preferably provided substantially horizontally. The guide rail 7 is provided to suppress the floating of the bellows tube 6 and guide the movement of the air diffusing tube 1.

In the aeration device of the aeration tank according to the fourth aspect of the present invention, as a means for moving the air diffuser pipe 1 while releasing the air, the air diffuser pipe 1 is connected to the tip of the air feed pipe 4 so as to be horizontally rotatable and ventilated. The air discharge hole 12 is provided at a side portion of the air diffusing tube 1 so that the air diffusing tube 1 is rotated in one direction by the jetting force of air.

[0009]

According to the aeration device for the aeration tank of the present invention, since the air diffuser pipe 1 moves while discharging the air, the portion of the aeration tank 3 to which the air is supplied also changes correspondingly. . Therefore, the amount of dissolved oxygen in water in the aeration tank 3 can be made uniform. At this time, the air diffuser 1 is connected to the air supply pipe 4
Since it moves using the force of the air sent from, it is not necessary to separately provide a drive source for moving the air diffuser 1.

According to the air diffuser of the aeration tank according to the second aspect of the present invention, the air sent from the air feeding pipe 4 is the bellows pipe 6.
And is discharged from the air diffuser 1 into the aeration tank 3. At this time, the air discharged from the air diffusing pipe 1 receives the ventilation resistance, and when the momentum of the air sent from the air feeding pipe 4 becomes strong, the ventilation resistance of the air diffusing pipe 1 becomes large, and the air pressure in the bellows pipe 6 becomes large. The bellows tube 6 rises, the bellows tube 6 extends, and the air diffuser tube 1 is pushed out and moved. On the contrary, when the momentum of the air discharged from the air diffuser pipe 1 becomes weak or stops, the ventilation resistance of the air diffuser pipe 1 becomes small and the air pressure in the bellows pipe 6 also decreases, so that the bellows pipe 6
Contracts due to self-contractibility, and the air diffuser tube 1 is pulled back.
Therefore, the air diffuser 1 responds to the strength of the air sent from the air sending pipe 4 to reciprocate while discharging the air.

In this case, the guide rail 7 is placed on the bellows tube 6.
Is provided substantially horizontally, the bellows tube 6 is prevented from floating by the guide rail 7, and the air diffusing tube 1 reciprocates in a substantially horizontal direction along the guide rail 7.

According to the air diffuser for the aeration tank of the fourth aspect of the present invention, the air discharge hole 1 provided at the side portion of the air diffuser 1 is provided.
When air is discharged into the water from 2, the air diffuser 1 obtains a propulsive force in the direction opposite to the air discharge direction by the jetting force.
Since the air diffuser 1 is horizontally rotatable, it is rotated by the above-mentioned propulsive force while discharging air.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings shown as embodiments.

FIG. 1 (a) is a side view showing an embodiment of an air diffuser for an aeration tank according to the present invention, and FIG. 1 (b) is an enlarged perspective view of a main part thereof. FIG. 2 is a side sectional view showing an example of a septic tank using the air diffuser of the aeration tank shown in FIG.

As shown in FIGS. 1 (a) and 1 (b), the air diffuser of the aeration tank is provided in the aeration tank 3, and has an air supply pipe 4 and a base end at the tip of the air supply pipe 4. Is provided with a bellows tube 6 that is ventilated and connected, and an air diffuser tube 1 that is ventilated and connected to the tip of the bellows tube 6. A horizontal guide rail 7 is provided on the bellows tube 6 and the air diffusing tube 1 in parallel with the direction from the base end to the tip of the bellows tube 6.

The aeration tank 3 will be described. For example, as shown in FIG. 2, the aeration tank 3 is provided adjacent to the water side of the precipitation separation tank 10 in the purification tank 8, and in the precipitation separation tank 10. The supernatant water of the wastewater 5 from which sludge has been removed by sedimentation is purified by the activated sludge method. That is, aerobic microbes propagate in the aeration tank 3, and by supplying air into the water from the diffuser pipe 1 through the air supply pipe 4 in the aeration tank 3, the microbes decompose the pollutants of the wastewater 5. Then, the wastewater 5 is purified.

A filter medium 2 which is in contact with the air discharged from the air diffusing tube 1 is provided in the middle abdomen of the aeration tank 3 above the air diffusing tube 1. That is, since the air coming out of the air diffuser 1 comes into contact with the filter medium 2, it takes a long time to float on the water surface, the contact time between the air and the waste water 5 becomes long, and the oxygen supply efficiency into water is improved. Is. The waste water 5 purified in the aeration tank 3 is further mixed with a sedimentation tank 13 and a disinfection tank 14.
Is discharged through.

The end of the air supply pipe 4 is connected to an air pump 9 (blower). The place where the air pump 9 is installed is not particularly limited, and it may be provided inside the septic tank 8 or outside the septic tank 8. However, it is preferable to install the air pump 9 at a place where maintenance is easy.

A bellows tube 6 connected to the tip of the air supply tube 4 by ventilation.
Is a flexible bag having an outer skin formed in a bellows shape, such as an accordion, and the bellows tube 6 has a self-contracting property. That is, the bellows tube 6 is in a state of being contracted toward the base end side when no atmospheric pressure is applied inside.

An air diffusing tube 1 which is connected to the tip of the bellows tube 6 by ventilation.
Is provided with a large number of air discharge holes 12 for ejecting air into the water. It is preferable that the air discharge holes 12 are pores that can generate small bubbles in water. That is, it is possible to increase the contact area between the air and the dirty water 5 by discharging the air into the water as small bubbles.

The operation of the air diffuser 1 in the air diffuser of the aeration tank will be described. When the air pump 9 is started, air is sent into the bellows tube 6 through the air feeding tube 4, and is further discharged into the water from the air discharge hole 12 of the air diffusing tube 1 through the bellows tube 6. At this time, the air discharged from the air diffuser pipe 1 receives ventilation resistance, so that the air pressure in the bellows pipe 6 rises. The air pressure in the bellows tube 6 is further increased when the force of the air sent from the air supply tube 4 is increased and the ventilation resistance of the air diffuser tube 1 is increased, and the air pressure in the bellows tube 6 is increased. When it becomes stronger than the restoring force due to the self-contracting property of the
Is extruded. On the contrary, when the momentum of the air discharged from the air diffuser 1 becomes weaker, the ventilation resistance of the air diffuser 1 becomes smaller and the air pressure in the bellows tube 6 also lowers. Is pulled back.

Therefore, when the force of the air sent from the air pump 9 to the bellows tube 6 through the air supply tube 4 is increased or decreased, the air diffuser tube 1 reciprocates while releasing the air in response thereto. In this case, even if the air pump 9 is operated / stopped at regular intervals, in response thereto, the air diffuser 1 can be reciprocated while releasing air. At this time, the bellows tube 6 is prevented from floating by the guide rail 7,
Further, the air diffuser 1 horizontally reciprocates along the guide rail 7 while discharging air into the water. Therefore, it is possible to supply the air to each part in the aeration tank 3 almost uniformly,
The amount of dissolved oxygen in the water in the aeration tank 3 becomes uniform.

By applying the air diffuser of the aeration tank, as shown in FIG. 3, even if the bellows pipes 6 and 6 and the air supply pipes 4 and 4 are provided so as to face each other on both left and right sides of the air diffuser 1. The air diffuser 1 can be horizontally reciprocated while releasing air into the water. In this case, one bellows tube 6 to the air diffuser 1
It is desirable that the air sent to the air diffuser is discharged into the water without passing through the other bellows tube 6. For this reason, for example, a switching valve is provided in the air diffuser tube 1 to direct the air supplied to the air diffuser tube 1. Can be switched, or by providing a partition in the air diffusing pipe 1 or connecting the air diffusing pipes 1 and 1 integrated in parallel to the bellows pipes 6 and 6, respectively, by connecting the left and right bellows pipes 6 and 6 respectively. It may be possible to completely block the ventilation of the. Further, it is desirable that the left and right air supply pipes 4 and 4 are alternately fed with air, and therefore, for example, the ends of the left and right air supply pipes 4 and 4 are unified by a bifurcated pipe equipped with a switching valve. The air pumps 9 may be connected to each other, or the ends of the left and right air supply pipes 4 and 4 may be connected to different air pumps 9 and 9 to operate the air pumps 9 and 9 alternately.

FIG. 4 (a) is an enlarged perspective view of an essential part showing another embodiment of the air diffuser for an aeration tank of the present invention, and FIG. 4 (b) is a top view thereof.

As shown in the figure, in the air diffuser for the aeration tank, a rotary base 11 is provided in which the tip of the air supply pipe 4 is provided at the bottom of the aeration tank 3.
One end of the air diffusing tube 1 is connected to the rotating base 11 so as to be horizontally rotatable. The air supply pipe 4 and the air diffuser pipe 1 are aerated inside the rotary base 11. Also,
A large number of air discharge holes 12 are arranged in parallel on one side of the air diffuser 1. Although not shown, the end of the air supply pipe 4 is connected to the air pump 9.

The aeration device for the aeration tank can be used for the aeration tank 3 similarly to the aeration device for the aeration tank described above. For example, as shown in FIG. It is preferable to install it below.

In the air diffuser of the aeration tank, when the air pump 9 is operated, air is sent to the air diffuser pipe 1 through the air feed pipe 4 and is discharged into the water from the air discharge hole 12. Then
The air diffuser 1 obtains a propulsive force by its jetting force in a direction opposite to the air discharge direction, and makes a rotary motion. That is, since the air diffuser 1 rotates while releasing air, it is possible to supply air to each part in the aeration tank 3 substantially evenly.
The amount of dissolved oxygen in the water inside becomes uniform. Further, in the air diffuser of the aeration tank, it is not necessary to increase or decrease the force of the air sent from the air feeding pipe 4 to the air diffusing pipe 1, and a constant amount of air may be continuously supplied.

[0028]

According to the air diffuser for the aeration tank of the first aspect of the present invention, since the air diffuser pipe 1 moves while discharging the air, the portion of the aeration tank 3 to which the air is supplied correspondingly also moves. Change. Therefore, the air can be supplied into the aeration tank 3 substantially uniformly, and the amount of dissolved oxygen in the water in the aeration tank 3 can be made uniform. Therefore, the purification capability of the aeration tank 3 is improved. At this time, since the air diffuser 1 moves by using the force of the air sent from the air supply pipe 4, the air diffuser 1
It is not necessary to separately provide a drive source for moving the.

According to the aeration device for the aeration tank of the second aspect of the present invention, the air sent from the air supply pipe 4 is the bellows pipe 6.
And is discharged from the air diffuser 1 into the aeration tank 3. At this time, the air discharged from the air diffusing pipe 1 receives the ventilation resistance, and when the momentum of the air sent from the air feeding pipe 4 becomes strong, the ventilation resistance of the air diffusing pipe 1 becomes large, and the air pressure in the bellows pipe 6 becomes large. The bellows tube 6 rises, the bellows tube 6 extends, and the air diffuser tube 1 is pushed out and moved. On the contrary, when the momentum of the air discharged from the air diffuser 1 becomes weaker, the ventilation resistance of the air diffuser 1 becomes smaller and the air pressure in the bellows tube 6 also lowers. Is pulled back. Therefore, the air diffuser 1 responds to the strength of the air sent from the air sending pipe 4 to reciprocate while discharging the air. Therefore, the air can be supplied into the aeration tank 3 substantially uniformly.

In this case, the guide rail 7 is provided on the bellows tube 6.
Is installed horizontally, the bellows tube 6 is guided by the guide rail 7
The air diffusing tube 1 reciprocates horizontally along the guide rails 7 by the floating prevention.

According to the air diffuser of the aeration tank of the fourth aspect of the present invention, the air discharge hole 1 provided at the side portion of the air diffuser 1 is provided.
When air is discharged from the water 2 into the water, the air diffuser 1 obtains a propulsive force in the direction opposite to the air jetting direction by the jetting force.
Since the air diffuser 1 is horizontally rotatable, it is rotated by the above-mentioned propulsive force while discharging air. Therefore, the air can be supplied into the aeration tank 3 substantially uniformly.

[Brief description of drawings]

FIG. 1 (a) is a side view showing an embodiment of an air diffuser for an aeration tank of the present invention, and FIG. 1 (b) is an enlarged perspective view of a main part thereof.

FIG. 2 is a side sectional view showing an example of a septic tank using the air diffuser of the aeration tank according to FIG. 1 (a).

FIG. 3 is a side view showing an application example of the air diffuser of the aeration tank according to FIG.

FIG. 4 (a) is an enlarged perspective view of an essential part showing another embodiment of the air diffuser for an aeration tank of the present invention, and FIG. 4 (b) is a top view thereof.

[Explanation of symbols]

 1 Air diffuser 3 Aeration tank 4 Air supply pipe 6 Bellows pipe 7 Guide rail 12 Air release hole

Claims (4)

[Claims] 1. An air supply pipe for sending air to the bottom of the aeration tank, and an air diffuser communicating with the air supply pipe and discharging the air sent from the air supply pipe into the water at the bottom of the aeration tank.
An air diffuser for an aeration tank, comprising means for moving the air diffuser while releasing the air by using the force of the air sent from the air supply pipe. 2. The air fed from the air feeding pipe to the distal end of the air feeding pipe, the base end of which is a self-contractile bellows pipe being ventilated and connected to the tip of the bellows pipe being ventilated to be connected to the air diffuser pipe. The air diffuser for an aeration tank according to claim 1, wherein the air diffuser is provided so as to extend and contract in a substantially horizontal direction according to the strength of the force. 3. The air diffuser for an aeration tank according to claim 2, wherein a guide rail is provided substantially horizontally on the bellows tube. 4. An air diffuser is rotatably connected to the tip of the air supply pipe so as to be horizontally rotatable. The air diffuser for an aeration tank according to claim 1, wherein the air diffuser is provided.