JPH0128639B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an aeration device for efficiently treating sewage, industrial waste water, and the like.

Prior art and its problems When treating wastewater containing organic matter such as sewage and industrial waste water, it is common to aerate the wastewater and perform an aerobic fermentation process, that is, a nitrification process. However, in conventional aerobic fermentation treatment, air is blown directly into the aeration tank or air is blown into the aeration tank while stirring the wastewater. Sufficient aeration is not performed at a location away from the stirring point, and the entire tank is in a non-uniform state.

Means for solving the problem: It consists of a column erected in the aeration tank, a water level fluctuation float provided on the column so as to be movable up and down, and a self-priming stirring device with a float connected to the water level fluctuation float. The self-priming stirring device is characterized in that it is configured to generate an agitation water flow in the tangential direction of a circle with the support as an axis, and the thrust generated by driving the stirrer is used to move the stirrer into the tank. The tank is rotated within the tank and floated up and down in response to changes in the water level, and is always kept at the optimal position to agitate and aerate the wastewater throughout the tank, thereby improving aeration efficiency.

Embodiments Next, the present invention will be described based on embodiments shown in the drawings.

In the figure, reference numeral 1 denotes an aeration tank or pond having a desired size. In the illustrated embodiment, it is rectangular, but it may also be circular or other shapes. Although the shape of the tank is not limited, In view of uniformity and ease, a circular or square shape is preferable.

A column 2 is erected in the center of the aeration tank 1, and a float 3 is supported by the column 2 so as to rise and fall according to changes in the water level in the tank, and a slip ring or the like is built into the float 3 for agitation. Power is supplied to the apparatus, and one or more arms 4, 4, for example, in the illustrated embodiment, are provided protrudingly from the float, and each arm 4 has a stirrer with a float attached to its tip. A device 5 is provided.
At this time, the float-equipped agitation device 5 moves up and down, that is, floats and sinks, together with the float 3 supported by the column in response to changes in the liquid level in the tank, so that it is always maintained in a floating state at the water surface position. Further, it is preferable that the arm 4 is extendable so that it can be set at the optimum position in the aeration tank, but it may also be of a fixed length.

The self-priming stirring device 5 with a float has one or two floats 51, 51 fixed to a frame 52, and the frame 52 and the end of the arm are swingably engaged, and a stirrer 53 is mounted on the frame 52.
This self-priming stirrer 53 can be of various types, one example of which is shown in Fig. 4.
It is shown in FIG. In this figure, 53a is a motor, and a hollow shaft 53b is provided directly connected to the motor, and this motor hollow shaft is housed in a cover 53c, and a stirring propeller 53d is fixed to the tip of the hollow shaft. A hole is bored above the water surface of this hollow shaft to serve as an intake hole, and an opening at the lower end is used as an air diffusion hole. Therefore, when the propeller is rotated by the motor through the hollow shaft, air is sucked in through the air intake port formed in the cover. This is because a water flow is generated in the axial direction of the hollow shaft due to the rotation of the propeller 53d, which is always submerged in the water below the liquid level.As a result, a low pressure area (negative pressure) is formed in the liquid at the tip of the hollow shaft, and this low pressure causes the water flow to flow. Air is sucked in through the intake hole of the hollow shaft, flows down inside the hollow shaft, and the underwater air is released as minute bubbles through the air diffuser hole at the tip opening.
This allows stirring of the liquid (sewage) and aeration at the same time.

Furthermore, when the propeller 53d of the agitator 53 is rotationally driven, the hollow shaft on which this propeller is installed is inserted into the waste water at a certain angle with respect to the water surface, so a water flow is generated by this propeller, and this water flow acts as a reaction force on the stirrer, generating thrust throughout the float. This thrust forces the self-priming stirring device with a float to move forward. However, since the agitation device with a float is supported by an arm protruding from the float, it rotates in the tank around the float 3, and it stirs the entire aeration tank by rising and falling according to changes in the water surface. Aeration will be performed.

Effects of the Invention According to the present invention, an arm is protruded from a float provided to rise and fall according to changes in the liquid level in the aeration tank and freely rotate, and a self-priming agitator with a float is attached to the tip of this arm. By installing one or more units, the agitator is driven by the agitator, which automatically rotates in the tank using its thrust, and automatically floats and sinks as the liquid level changes, stirring and aerating the wastewater. This has the advantage of being able to uniformly cover the entire tank, and furthermore, the entire device can be moved (rotated) using only the drive device of the stirring device, which simplifies the device.

[Brief explanation of drawings]

1 is a plan view, FIG. 2 is a cross-sectional view, FIG. 3 is a partial cross-sectional explanatory view of the float section, FIG. 4 is a cross-sectional view of the agitation device with a float, and FIG. 5 is a side view thereof. 1... Aeration tank, 2... Strut, 3... Float, 4... Arm, 5... Stirring device with float, 51... Float, 52... Frame, 53... Stirrer, 53a... Motor, 53b... Hollow shaft, 53c... Cover, 53d
…propeller.

Claims (1)

[Claims] 1. Consisting of a column erected in an aeration tank, a water level variation float provided on the column so as to be movable up and down, and a self-priming stirring device with a float connected to the water level variation float, the self-priming type with float is An aeration device characterized in that the stirring device is configured to generate a stirring water flow in a tangential direction of a circle having the support as an axis.