JPH11188385A - Aerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform both aerobic treatment and anaerobic treatment efficiently by setting a motor which can rotate in two ways on a float which floats and sinks corresponding to the supply amount of air, and mounting an aerating screw and an agitating screw at the upper part position and lower part position of a rotary shaft driven by the motor, respectively. SOLUTION: In the aerobic treatment of sewage, air in a float 4 is discharged from an air supply/discharge pipe 5, only the upper part of an aerating screw 2 set at the upper part position of a rotary shaft 1 is immersed in water, and a motor 7 is rotated normally so that sewage is raised to be released and diffused into air. Besides, in the anaerobic treatment of sewage, air is supplied from the pipe 5 into the float 4, the screw 2 is positioned on water, an agitating screw 3 is immersed completely in water, and the motor 7 is rotated reversely to discharge air in the float 4 from the pipe 5, while only the lower part of the screw 2 is immersed in water, and the motor 7 is rotated normally to release and diffuse the sewage in water.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aerator capable of selectively switching between aerobic treatment and anaerobic treatment of sewage in a sewage treatment plant.

[0002]

2. Description of the Related Art Conventionally, in a sewage treatment plant, the operation of an aerator is selectively switched between aerobic treatment and anaerobic treatment in order to nitrify and denitrify wastewater flowing into a treatment tank. ing.

As described above, an aerator as shown in FIG. 4 is used to selectively switch between aerobic treatment and anaerobic treatment of waste water. In this aerator, a motor 7 capable of normal and reverse rotation is disposed on a float 4 that floats and sinks according to the supply amount of air from a supply / exhaust pipe 5, and a screw 10 is formed on a rotating shaft 1 driven by the motor 7. It is structured to be. The aeration device supplies air from the air supply / exhaust pipe 5 to the float 4, and rotates the motor 7 in a forward direction so that only the lower part of the screw 10 is immersed in water, thereby discharging and diffusing waste water into the air. The aerobic treatment is performed as described above, while the air of the float 4 is discharged from the supply / exhaust pipe 5 and the motor 7 is rotated in the reverse direction so that the entire screw 10 is immersed in the water, so that the sewage is removed from the water. The anaerobic treatment is performed by releasing and dispersing the wastewater.

[0004]

As described above, the above-described conventional aerator uses one screw 10 and changes the rotation direction of the motor 7 and the amount of the screw 10 immersed in water, thereby removing waste water. An aerobic treatment that releases and diffuses into air and an anaerobic process that releases and diffuses wastewater into water are switched. In this case, one screw 10 is formed into a screw shape suitable for both processes. Therefore, both aerobic treatment and anaerobic treatment could not be efficiently performed.

The present invention has been made in view of the above-mentioned problems of the conventional aerator, and performs both aerobic treatment and anaerobic treatment efficiently while selectively switching between aerobic treatment and anaerobic treatment of sewage. It is an object of the present invention to provide an aerator capable of performing the above.

[0006]

In order to achieve the above object, an aerator according to the present invention is provided with a motor capable of rotating forward and reverse on a float that floats and sinks according to the amount of air supplied, and is driven by the motor. A screw for aeration is formed at an upper position of the rotating shaft, and a screw for stirring is formed at a lower position.

In this aerator, the air in the float is discharged from a supply / exhaust pipe, and at least the lower part of the aeration screw is immersed in water, and the motor is rotated forward to discharge and diffuse sewage into the air. Aerobic treatment as described above, while supplying air to the float from the supply / exhaust pipe,
The anaerobic treatment is performed such that the aeration screw is positioned above the water and the motor is reversely rotated so that the whole of the stirring screw is immersed in the water so that the wastewater is released and diffused into the water.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the aerator according to the present invention will be described below with reference to the drawings.

1 to 3 show an embodiment of the aerator of the present invention. This aerator is installed, for example, in a treatment tank of a sewage treatment plant, and can selectively switch between aerobic treatment and anaerobic treatment in order to perform nitrification and denitrification of wastewater flowing into the treatment tank. A motor that can be rotated forward and backward through a motor mount 6 on a ring-shaped float 4 that floats and sinks within a predetermined range in accordance with the amount of air supplied from an air supply / exhaust pipe 5. 7, two types of screws 2 and 3 are formed on the rotating shaft 1 driven by the motor 7, and the rotating shaft 1 is immersed in water so as to penetrate substantially the center of the float 4. It is configured to

In this case, one of the two kinds of screws 2 and 3 formed on the rotating shaft 1 driven by the motor 7 is for aeration, and the aeration screw 2 is a rotating shaft. 1 is formed at the upper position. Then, the air of the float 4 is discharged from the air supply / exhaust pipe 5 and only the lower part of the aeration screw 2 is immersed in water, and the motor 7 is rotated forward, thereby winding up the sewage and releasing it into the air. So that aerobic treatment is performed.

The other screw 3 is for agitating, and the agitating screw 3 is formed at a lower position of the rotating shaft 1, more preferably at a lower position. Then, air is supplied from the air supply / exhaust pipe 5 to the float 4, and the aeration screw 2
Is placed on the water, and the motor 7 is reversely rotated so that the whole of the stirring screw 3 is immersed in the water, so that the sewage is released and diffused into the water to perform the anaerobic treatment. . In this case, the stirring screw 3 is formed in a shape suitable for stirring the sewage, and is formed in a shape in which a load due to stirring is not generated when the motor 7 is rotated forward. The stirring screw 3 is
The aeration screw 2 is formed to have a smaller diameter than the aeration screw 2 so that a high-speed water flow is generated by stirring the sewage, and the rotation speed of the motor 7 is adjustable.
It is desirable to set the rotation speed at the time of reverse rotation to be higher than the rotation speed at the time of normal rotation.

In addition to the ring-shaped float shown in the present embodiment, the float 4 has a motor 7 of an aerator and the like stably supported on water while controlling the amount of air supplied from the air supply / exhaust pipe 5. Accordingly, air is supplied to the float 4 from a predetermined range, that is, from the supply / exhaust pipe 5, and the aerating screw 2 formed at the upper position of the rotating shaft 1 is positioned above the water, If the air of the float 4 is discharged from the exhaust pipe 5 and only the lower part of the aeration screw 2 can be floated and settled between the sinking positions where the lower part of the screw 2 is immersed in water, a plurality of block-shaped ones can be used. Any shape can be used, such as using in combination.

Hereinafter, the operation of the aerator will be described. When performing aerobic treatment of sewage, as shown in FIG. 1, the air of the float 4 is discharged from the supply / exhaust pipe 5 and only the lower part of the aeration screw 2 formed at the upper position of the rotating shaft 1 is immersed in water. By rotating the motor 7 in the positive direction, the wastewater is wound up and released and diffused into the air. At this time, the stirring screw 3 rotates while being immersed in water, but no load occurs due to its shape.

On the other hand, when performing anaerobic treatment of sewage, as shown in FIG. 2, air is supplied from an air supply / exhaust pipe 5 to a float 4, and an aeration screw 2 formed at an upper position of the rotary shaft 1 is provided.
Is positioned above the water, and the whole of the stirring screw 3 is immersed in the water, and the motor 7 is rotated in the reverse direction, so that the air of the float 4 is discharged from the floating exhaust pipe 5 in which the sewage is immersed in the water. After discharging, only the lower part of the aeration screw 2 is immersed in water, and the sewage is released and diffused into water by rotating the motor 7 forward.

[0015]

According to the aerator of the present invention, at least the lower part of the screw for aeration is immersed in water and the motor is rotated forward to discharge and diffuse sewage into the air to perform aerobic treatment. On the other hand, while the screw for aeration is positioned above water, the motor is reversely rotated so that the whole of the screw for stirring is immersed in water, so that sewage is released and diffused in water to be anaerobic. Processing can be performed. Thus, both aerobic treatment and anaerobic treatment can be efficiently performed while selectively switching between aerobic treatment and anaerobic treatment of sewage. Loss can be reduced.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of an aerator according to the present invention (during aerobic treatment).

FIG. 2 is a front view showing the same (at the time of anaerobic processing).

FIG. 3 is a plan view of the same.

FIG. 4 is a front view showing a conventional aerator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotary shaft 2 Aeration screw 3 Stirring screw 4 Float 5 Supply / exhaust pipe 6 Motor mount 7 Motor

Claims (1)

[Claims] 1. A motor capable of rotating forward and backward is disposed on a float that floats and sinks according to the supply amount of air, an aeration screw is provided at an upper position of a rotating shaft driven by the motor, and a stirring screw is provided at a lower position. An aerator characterized in that each screw is formed.