JPS61234994A - Aeration apparatus - Google Patents

Abstract

PURPOSE:To improve efficiency of aeration by constituting a self-suction type stirring device so as to generate stream generated by stirring in tangential direction to a circle around a shaft comprising a stanchion provided in an aeration tank. CONSTITUTION:A float 3 capable of moving vertically and freely rotatably depending upon the water level is provided to a stanchion 2 erected in an aeration tank 1. Arms 4 are installed protrudingly to the float 3, and self-suction type stirring devices 5 are attached to the top end of the arms. Water stream is generated by the stirring of the devices 5 in the tangential direction of circles centering the stachion 2. Thus, the devices 5 are moved around in the tank 1 utilizing the driving force generated by the driving of the stirring devices 5. The devices are floated or sunk in accordance with the change of the water level and held always at an optimum position for the stirring and aeration of filthy water, improving thus the efficiency of aeration.

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.

BACKGROUND ART Conventional techniques and their problems When treating wastewater containing organic matter such as sewage and industrial wastewater, 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, so air is blown in and stirred as needed. , there is insufficient aeration at locations away from the WlnH location, resulting in non-uniform barking throughout the tank.

The solution to the problem consists of a column installed in the aeration tank, a water level fluctuation float attached to the column so as to be able to move up and down, and a self-priming stirring device with a float connected to the water level fluctuation float. The self-priming stirring device with a float is characterized in that it is configured to generate a stirring 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 inside the tank. It rotates and moves, and floats and sinks according to changes in the water level, and is always kept in the 1st stage position to stir and aerate the wastewater in the entire tank, thereby improving the aeration efficiency.

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

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

A column 2 is installed in the center of the aeration tank 1, and this column 2 supports the float by rising and falling according to changes in the water level in the tank, and a slip ring or the like is built into the float to agitate the water. Power is supplied to the device, and the float is further provided with one or more mushroom arms, for example, in the illustrated embodiment, two opposing arms 4. Install @5.

At this time, the float size stirring device 6 moves up and down, that is, floats and sinks, together with the float 8 supported by the column, according to changes in the liquid level in the tank.
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 an optimal position in the aeration tank, but it may also be of a fixed length.

Float size self-priming stirring! i device 5 - or two flows 1'gt, 51 frame h! Fix this frame 6! This frame S! A stirring La5s is placed on top of the self-priming stirring aSS. Various types of self-priming stirring aSS can be adopted, examples of which are shown in @4- and @srg4.
S@ is a motor that is directly connected to a 1M motor and serves as a hollow shaft ssb, and this motor is housed in a hollow shaft cover ISC, and a stirring propeller 5sd is fixed to the tip of the hollow shaft, and the water surface of this hollow shaft is A hole is formed at a higher position 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 via the hollow shaft, air is sucked in through the air intake port formed in the cover. This is propeller I'II, which is always underwater below the liquid level! The rotation of d generates a water flow in the axial direction of the hollow shaft.

As a result, a low pressure area (negative pressure) is formed in the liquid at the tip of the hollow shaft, and due to this low pressure, air is sucked into the water flow, that is, air is sucked from the intake hole of the hollow shaft, flows down inside the hollow shaft, and then opens at the tip. Underwater air is released as fine bubbles from the air diffusion holes in the
This allows stirring of the liquid (sewage) and aeration at the same time.

Further, when the propeller I%sd of the agitator 68 is rotationally driven, a water flow is generated by the propeller because the hollow shaft provided with this propeller is inserted into the waste water with a certain angular deviation with respect to the water surface.

This water flow acts as a reaction force on the stirrer, and thrust is generated throughout the 70 parts. This thrust causes the float-equipped self-priming stirring device to move forward.

However, since the float stirring device is supported by an arm protruding from the float, the inside of the tank rotates around the float 8, causing the entire aeration tank to float and sink in response to changes in the water surface. Aeration will be performed while stirring.

Effects of the Invention According to the present invention, an arm is protruded from a float provided so as to rise and fall according to changes in the liquid level in the aeration tank and freely rotate, and a self-priming stirrer is attached to the tip of this arm. By pouring one or more units of E, the agitator is driven by the agitator, which uses its thrust to automatically rotate in the tank, and automatically floats and sinks with one change in liquid level, stirring and aerating the sewage. This has the advantage that the entire tank can be evenly distributed, and the entire tank can be moved (rotated) only by driving the stirring device.

There are advantages such as the device can be made easily flff.

[Brief explanation of the drawing]

Figure 1 is a view of the bower. The figure is a cross-sectional view, FIG. 8 is a partial cross-sectional view of a 70-ton part, FIG. 4 is a cross-sectional view of the float #agitation device, and FIG. 6 is a side view thereof. 1. . Aeration tank Tomi. ,. Strut +1. ,s Float 4, ,Arm 6,. , Float-equipped stirring device Fil, , Float 52,. 7 frame 511, Jl agitator rssa, , , motor Figb, ,, hollow shaft r; sc, ,, cover l5IId,, , propeller patent 1 person Japan Sewage Works Agency patent 1iii person Hitachi Iyaden Kogyo Outside Co., Ltd.
1 personFigure 1Figure 2Figure 3Figure 4Figure 5

Claims (1)

[Scope of Claims] The above-mentioned system comprises a support erected in an aeration tank, a water level fluctuation float provided on the support support so as to be movable up and down, and a self-priming stirring device with a float connected to the water level fluctuation float. An aeration device characterized in that the self-priming agitation device with a float is configured to generate an agitation water flow in a tangential direction of a circle having the support as an axis.