JPH0437758B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to an aeration tank. More specifically, the present invention relates to an aeration tank that can prevent sludge accumulation by increasing stirring efficiency.

[Prior art and its issues]

An aeration system was developed in 1974 that used a water sprinkling method to suck up wastewater from the bottom of the aeration tank and sprinkle water onto the water surface.
Publication No. 18377, Special Publication No. 36998 (1982), Japanese Patent Publication No. 1973 (1973)
It is disclosed in Publication No. 128537. According to this sprinkler device, oxygen in the air can be efficiently dissolved in wastewater with a small amount of power and a narrow installation space. However, since the sewage intake port is fixedly installed at the bottom of the tank, not only some sludge accumulates in the corners of the bottom of the tank, but also air bubbles accumulate, resulting in a low oxygen supply rate to the sewage as a whole. We have the challenge of becoming.

[Purpose of the invention]

Therefore, the purpose of the present invention is to increase the stirring efficiency of the sewage in the aeration tank, prevent the accumulation of sludge, and improve the circulation efficiency of the sewage as a whole when sucking up the sewage from the bottom of the tank and sprinkling it on the water surface. Our goal is to provide an aeration tank.

[Structure of the invention]

The structure of the invention taken to achieve the above object is as follows. That is, the present invention provides an aerator that includes a water sprinkling port and a suction port, and the suction port is disposed at the bottom of the tank; a water wheel or a turbine that is provided within a range where water can be sprayed from the water sprinkling port of the aerator; The aerator is equipped with an adjustment device for adjusting the amount of water sprayed, and the water wheel or turbine is an aeration tank connected to a stirring means for stirring the bottom of the tank via a power transmission means.

【Example】

The present invention will be explained in more detail based on embodiments shown in the drawings. FIG. 1 is a schematic cross-sectional view of one embodiment. Reference numeral 1 indicates an aerator. The aerator 1 includes a cylindrical water suction pipe 10 and is fixed to an aeration tank 100. The suction port 5 of the aerator 1 is arranged slightly above the tank bottom 101 so that it does not stick to the tank bottom 101 when sewage is sucked in. That is, the suction port 5 of the aerator 1 is connected to the tank bottom 101.
It is placed close to the tank to suck up sludge from the bottom of the tank. As shown in FIG. 2, the water suction pipe 10 is connected to the tank bottom 101.
It can also be provided adjacent to. In this case, the suction port 5 is provided in the horizontal direction so that the suction port 5 does not come into contact with the tank bottom 101. A valve 2 for adjusting the amount of water sprayed is provided near the water sprinkling port 5a of the aerator 1. A nozzle 4 is formed in the water sprinkling port 5a, so that dirty water can be sprayed far away. The aerator 1 is provided with a motor M at the top. The motor M is connected to an impeller 3 provided inside the water suction pipe 10. Therefore, the impeller 3 rotated by the motor M can suck up the dirty water from the suction port 5 and spray it toward the liquid level of the aeration tank 100 through the nozzle 4. The amount of water sprinkled can be easily adjusted by opening and closing the valve 2, or by changing the rotation speed of the motor M. The aerator 1 may be installed inside the aeration tank 100 as in the embodiment, or if the suction port 5 is installed inside the aeration tank 100, the aerator 1 can be installed inside the aeration tank 100.
There is no problem even if it is provided outside of 00. This allows selection to be made according to the conditions, improves repair workability, and is suitable for expansion. Furthermore, the water temperature may be controlled and adjusted by steam piping to the aerator 1. A water wheel or turbine 6 is provided within a range where water can be sprayed from the water sprinkling port 5a of the aerator 1. The water wheel or turbine 6 is connected to a stirrer 7, which is a stirring means for stirring the aeration tank bottom 101, via a transmission belt 8, which is a power transmission means. Then, by spraying water from the nozzle 4, a water wheel or turbine 6 is turned, which is used as a power source to operate an agitator 7 which is rotated by a transmission belt 8. That is, since the bottom of the tank is stirred by the stirrer 7,
This prevents the accumulation of sludge, increases the retention rate of air bubbles, and increases the oxygen supply rate. As described above, the stirring device in this example does not require any new power for stirring and has a simple structure, so it is useful as a device for increasing the oxygen supply efficiency of the aeration tank. 3 and 4 are schematic sectional views showing other embodiments of the nozzle portion. A rotatable guide valve 9 is installed at the water sprinkling port of the nozzle 4.
is provided. Therefore, when reducing the amount of oxygen supplied, adjust the guide valve 9 downward so that the water flow is directed downward, as shown in FIG. 3, to shorten the contact time with air. When increasing the amount of oxygen supplied, the guide valve is directed upward as shown in FIG. 4 to lengthen the contact time between the water flow and the air. According to this embodiment, the contact time between the water flow and the air can be adjusted steplessly within a certain range. Note that the present invention is not limited to the illustrated embodiments, and within the scope of the claims,
Numerous variations are possible.

【Effect of the invention】

The present invention has the above configuration and has the following effects. (1) By spraying water from the water sprinkling port to the water wheel or turbine and operating the stirring means, it is possible to prevent the accumulation of sludge and improve the circulation efficiency of sewage in the aeration tank. Further, since water is sprayed from the water sprinkling port onto the water wheel or turbine to operate the stirring means, no new power is required for stirring. Furthermore, since the structure is simple, it is useful as a device for increasing the oxygen supply efficiency of an aeration tank. (2) Currently, overloading of wastewater treatment equipment is becoming a problem, and there is an urgent need to expand equipment, but on the other hand, especially in large cities, due to land shortages and rising land prices, there is no choice but to aim for three-dimensional equipment. do not have. According to the present invention, it does not require much installation space, has good workability for repairs, etc., and is suitable for expansion.

[Brief explanation of drawings]

FIG. 1 is a schematic sectional view of one embodiment, and FIG. 2 is a
An explanatory diagram showing another embodiment of the suction port, FIG.
FIG. 4 shows a schematic sectional view showing another embodiment of the nozzle part. 1...Aerator, 5...Suction port, 5a...
...Water spout, 6...Water wheel or turbine.

Claims (1)

[Claims] 1. A water sprinkling port 5a and a suction port 5 are provided, and the suction port 5 is connected to an aerator 1 disposed at the bottom of the tank; A water wheel or turbine 6 provided; The aerator 1 is equipped with an adjustment device for adjusting the amount of water sprinkled, and the water wheel or turbine 6 is connected to a stirring means for stirring the bottom of the tank via a power transmission means. There is an aeration tank.