JPH11179394A - Aeration apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To uniformly disperse gas such as air into a tank in an aeration apparatus installed in an aeration tank for waste water treatment. SOLUTION: An aeration apparatus 1 is installed in an aeration treating tank T, etc., and a gas receiving tool 3 is disposed above an opening part 2a of an air pipe 2 disposed around the bottom part of the tank T. For the gas receiving tool 3, not only box shapes but also curved face forms can be considered. When it is to be installed, the gas receiving tool 3 is horizontally adjusted. When gas is fed into the air pipe 2 from a gas feeding source such as a blower under a condition where waste water is stored in the treating tank T, gas ejected from the opening part 2a is once stored in a gas storing part 4 of the gas receiving tool 3 disposed above it and then, immediately diffused in all directions, and is discharged approximately equally from all the aeration holes 5. Therefore, dispersed condition of the gas into the waste water can be made uniform.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air diffuser installed in, for example, an aeration tank for wastewater treatment, and an object of the present invention is to allow gas such as air to be uniformly dispersed in the tank.

[0002]

2. Description of the Related Art In a wastewater purification treatment system, an anaerobic treatment tank for treating wastewater in an anoxic environment and an aeration treatment tank for treating it under aerobic conditions are widely used. Aeration tanks are generally configured to supply air into the tank by guiding the air diffuser connected to the blower into the tank and discharging the air sent from the blower through the air diffusion holes of the air diffuser. It is.

[0003]

When the air diffuser is attached to the aeration tank, if the air diffuser is not horizontal, the depth of the water can vary depending on the location, and the water pressure acting on the air diffuser differs. In addition, there is a problem that the amount of air released from the air diffusing holes varies. In general, gas is preferentially released from holes in a region with a low water pressure, and gas release is suppressed in a region with a high water pressure. Therefore, the air supply pipe having an inappropriate posture may have an uneven supply of gas into the tank, and may have an uneven drainage treatment state depending on the region.

[0004] Even if the air diffuser can be properly attached to the tank, if the horizontal level adjustment of the tank itself is incomplete, the air diffuser will be inclined. Then, since the magnitude of the water pressure applied to the air diffuser differs depending on the portion, as a result, there arises a problem that the amount of air released from the air diffuser hole varies depending on the location as described above.

[0005]

SUMMARY OF THE INVENTION The present invention provides means for ensuring a uniform supply of gas into a tank regardless of the installation state of a diffuser tube or the installation state of the tank. The feature of the air diffuser adopted by the present invention is that a gas receiver having a large number of air diffusion holes and a gas reservoir communicating with the air diffusion holes, and an opening for discharging gas supplied from a gas supply source is provided with the gas And an air supply pipe located below the receiver. The gas receiver may be provided with a horizontal adjusting means.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1A shows a schematic configuration of an air diffuser 1 according to the present invention. The air diffuser 1 is installed in an aeration tank T or the like, and together with an air supply pipe 2 that supplies gas,
It has a special feature in that it is provided with a gas receiver 3 for once receiving the gas discharged from the air supply pipe 2 and then uniformly dispersing and discharging the gas. The air supply pipe 2 is provided with a gas supply source S such as a blower.
And an opening 2a for discharging gas near the bottom of the tank T is provided. The gas receiver 3 is an air pipe opening 2
a gas reservoir 4 is disposed inside the gas reservoir 4 and stores gas discharged from the opening 2a.
Are formed on the upper surface 3a.

The shape of the gas receiver 3 may be a box-like shape as shown in FIG. 1B, or a curved shape as shown in FIG. In the case of the box-shaped gas receiver 3 shown in FIG. 1B, a large number of air diffusing holes 5 are provided in a flat upper surface 3a, and are provided around the upper surface 3a and vertically provided on the lower surface side of the upper surface 3a. The gas reservoir 4 is formed by the peripheral wall 3b.

In the case of the gas receiver 3 having a curved surface shown in FIG. 2, since the air diffusion holes 5 are formed on the curved surface, the water pressure acting varies depending on the location. Therefore, it is necessary to change the hole diameter of the air diffusion hole 5 depending on the location. Specifically, as shown in the enlarged view of FIG. 2 (B), the air diffusion holes 5 (a) near the periphery are
Since the direction of the opening is inclined with respect to the vertical direction at the same time as the acting water pressure is slightly high, the diameter of the hole is slightly increased to easily release gas. The air diffusion hole 5 (a) near the center has a relatively low water pressure and the direction of the opening is close to the vertical direction, so that the gas can be easily released. The actual setting of the hole diameter is determined based on various conditions such as the curvature of the gas receiver 3 and the installation water depth.

When installing the air diffuser 1 of the present invention, the gas receiver 3 is adjusted so as to be horizontal. The mounting structure of the gas receiver 3 may be a fixed type or a movable type.
In the case of the fixed type, a horizontal state of the gas receiver 3 is secured by using a level at the time of installation. In the case of a movable type, a horizontal adjustment mechanism is provided to automatically obtain the horizontal state of the gas receiver 3 when drainage is collected in the tank.

The air diffusing device 1 configured as described above has a tank T
When the gas is supplied from the gas supply source S to the gas supply pipe 2 in a state where the wastewater W is stored in the inside, the gas discharged from the opening 2a is stored in the gas reservoir 4 of the gas receiver 3 arranged above. Once stored, it is immediately diffused in all directions and released almost equally from all diffuser holes 5. Therefore, the state of dispersion of the gas in the drainage W can be made uniform.

When the aeration device according to the present invention is applied to a biological treatment tank for wastewater, this aeration treatment tank may be either a floating activated sludge type or a contact aeration type using a contact material to which active microorganisms are adhered. . Also, in addition to biological treatment tanks, it is also possible to apply to chemical treatment tanks that require aeration,
Furthermore, use as a simple stirring means is also conceivable. The type of gas supplied by the air diffuser of the present invention is generally air when applied to an aeration treatment tank for wastewater, but other gases, depending on the use of the tank and the contents of treatment, For example, use of nitrogen, oxygen, carbon dioxide, or the like is not prevented.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] In the air diffuser 1 shown in FIG. 3, a mechanism for leveling the gas receiver 3 is provided at an appropriate position on the periphery of the gas receiver 3 and at the center of the bottom of the tank T. A configuration was adopted in which the installed anchor member 7 was connected with the connecting wire 6 having the same length. As the connecting wire 6, besides a flexible member such as a chain, a wire, a cable, and a rope, a bar made of metal or synthetic resin can be used. When water or the like is stored in the tank T and the gas is released from the air supply pipe 2, the gas is temporarily stored therein, so that the gas receiver 3 tends to float by buoyancy.
Since the gas receiver 3 is connected to the anchor member 7 by the connecting wire 6 having the same peripheral edge, the gas receiver 3 naturally takes a horizontal position in water. Therefore, in this embodiment, it is possible to automatically guide the gas receiver 3 to the horizontal posture without particularly performing the active horizontal adjustment. And the gas receiver 3 kept horizontal
The gas is uniformly dispersed and released into the water from the aeration holes.

Since the gas receiver 3 of this embodiment can freely move both with respect to the tank T and the air supply pipe 2, a horizontal state can be obtained regardless of the mounting state of the tank T and the air supply pipe 2. .
That is, even when the installation posture of the tank T or the air supply pipe 2 is not horizontal, there is an advantage that the gas receiver 3 can be surely adjusted to the horizontal posture.

The plane shape of the gas receiver 3 is determined according to the shape of the tank T. The attachment position of the connecting wire 6 is determined according to the shape of the gas receiver 3. For example, when the plane shape of the gas receiver 3 is square or rectangular,
The connecting wires 6 are attached to the four corners of the gas receiver 3. If the plane shape of the gas receiver 3 is circular, several connection wires 6 may be attached to the periphery of the gas receiver 3 at equal intervals.

It is also possible to omit the anchor member 7 and connect one end of the connecting wire 6 to the air supply pipe 2.

[Second Embodiment] In the air diffuser 1 shown in FIG. 4, a connecting wire 6 connected to an anchor member 7 installed at the bottom of the tank T is used.
Is attached to the center of gravity 3c of the gas receiver 3 from the back side. When gas is discharged from the air supply pipe 2 after storing water or the like in the tank T, the gas receiver 3 rises to a certain height due to the buoyancy of the gas stored inside. At this time, since the gas receiver 3 is pulled at the center of gravity 3c by the connecting wire 6, the posture is adjusted so as to maintain the balance, and as a result, the gas receiver 3 reaches the horizontal state.

[Third Embodiment] An air diffuser 1 shown in FIG.
The gas receiver 3 has a feature in that it is suspended by a float 8 floating on the water surface. That is, when the float 8 and the gas receiver 3 are connected by the connection wire 6 having the same length, when the water or the like is stored in the tank T, the float 8 floating on the water surface causes the gas receiver 3 to be connected to the connection wire 6. Is hung horizontally through. In this embodiment, since the attitude of the gas receiver 3 is determined with reference to the water surface, the gas receiver 3 can be reliably leveled regardless of the installation state of the tank T.

[Fourth Embodiment] When the installation state of the tank T is horizontal, the gas receiver 3 can be adjusted horizontally with reference to the bottom surface of the tank T. If the bottom surface of the tank T is horizontal, for example, as shown in FIG.
By connecting the anchor member 7 installed at an appropriate position on the bottom with the connecting wire 6 having an equal length, the gas receiver 3 can be in a horizontal state.

Alternatively, as shown in FIG.
In addition to pipes extending substantially from one end to the other end of the bottom surface, a connecting portion 2b of a connecting wire 6 is provided at an appropriate position of the air feeding pipe 2, and the air feeding pipe 2 and the gas receiver 3 are connected by the connecting wire 6. It is possible.

In this embodiment, if the length of the connecting wire 6 is adjusted to some extent, it is possible to cope with the case where the installation posture of the tank T is not horizontal.

[Fifth Embodiment] FIG. 8 shows an embodiment in which a horizontal adjusting device 10 for the gas receiver 3 is provided on the inner surface of the tank T. In this embodiment, a bolt 8 is erected on a bracket 11 or the like provided on the inner surface of the tank T, and a flange 3 d provided on a side surface of the gas receiver 3 is fixed to the bolt 8 with a nut 9. Therefore, the horizontal adjustment of the gas receiver 3 is possible by adjusting the screwing position of the nut 9.

[0022]

The gas diffuser according to the present invention is provided with the gas receiver for once receiving the gas discharged from the air supply pipe, so that the gas can be easily dispersed uniformly. Further, regardless of the installation state of the processing tank or the air supply pipe to which the air diffuser is attached, the gas receiver may be adjusted horizontally, so that the construction is simple.

Further, when the gas receiver is provided with a horizontal adjustment mechanism, it is not necessary to perform a horizontal adjustment operation.

[Brief description of the drawings]

FIG. 1 relates to one embodiment of the present invention,
FIG. 1A is a front cross-sectional view schematically showing a state in which an air diffuser is installed in an aeration tank, and FIG. 1B is a perspective view showing an example of a gas receiver.

FIG. 2 relates to an embodiment of the present invention,
FIG. (A) is a front sectional view showing another example of the gas receiver, and FIG. (B) is a sectional view showing a part of the gas receiver in an enlarged manner.

FIG. 3 is a front sectional view showing a first embodiment of the air diffuser according to the present invention and showing a schematic configuration of a main part.

FIG. 4 is a front sectional view showing a second embodiment of the air diffuser according to the present invention, and showing a schematic configuration of a main part.

FIG. 5 is a front sectional view showing a third embodiment of the air diffuser according to the present invention and showing a schematic configuration of a main part.

FIG. 6 is a front sectional view showing a fourth embodiment of the air diffuser according to the present invention, and showing a schematic configuration of a main part.

FIG. 7 is a front sectional view showing another aspect of the fourth embodiment of the air diffusing device according to the present invention, and showing a schematic configuration of a main part.

FIG. 8 is a front sectional view showing a fifth embodiment of the air diffuser according to the present invention, and showing a schematic configuration of a main part.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 diffuser 2 air supply pipe 3 gas receiver 3 a upper surface 3 b side wall 4 gas reservoir 5 diffuser hole 6 connecting wire 7 anchor member 8 float 10 leveling device S gas supply source T tank W drainage

Claims (2)

[Claims] 1. A gas receiver having a number of diffuser holes and a gas reservoir communicating with the diffuser holes, and an opening for discharging gas supplied from a gas supply source is disposed below the gas receiver. A diffuser, comprising: an air supply pipe; 2. The air diffuser according to claim 1, wherein the gas receiver includes a horizontal adjustment unit.