JPH0366038B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an aeration device that uniformly treats sewage or industrial waste water throughout the entire tank regardless of the water level.

[Conventional technology]

When treating wastewater containing organic matter, such as sewage or industrial wastewater, it is common to aerate the wastewater and perform aerobic fermentation, ie, nitrification.
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.

To improve this, there is a method disclosed in Japanese Utility Model Publication No. 58-26076.

[Problem to be solved by the invention]

In the device disclosed in the above-mentioned publication, an aeration gyroscope, which is the main body of the aerator, is installed in a half bridge to uniformly aerate the inside of the tank.

However, in this device the aeration gyroscope together with the guide wall constitutes a reaction drive for the movement of the half bridge. Since this aeration gyroscope is a vertical rotating aerator, the water flow that serves as the driving force occurs evenly around the entire circumference. Therefore, as it is, it will not be a propulsive force to rotate the half bridge, so two or three directions are enclosed by guide walls, only one direction is opened, and the water flow flowing in one direction is used as a propulsive force.

However, in this method, the water flow is blocked by surrounding the area with a guide wall, making the aeration area narrow. Further, the propulsive force obtained is small, and as described in the specification, there is a possibility that auxiliary power is required.

In addition, the guide wall divides the stirring basin and weakens the water flow. The present invention has been made in view of this.

[Means to solve the problem]

The present invention has been made to solve the above-mentioned drawbacks, and includes a self-priming stirring device whose hollow shaft is tilted at a desired angle with respect to the water surface, and which is supported by a float suspended in an aeration tank while aeration is carried out. A swivel arm equipped with a slip ring is rotatably attached to a support section located approximately in the center of the tank, and pivoted with a pin so that it can swing up and down as the water level fluctuates. The self-priming stirring device with a float is attached to the tips of two protruding long and short arms, and the self-priming stirring device with a float is aerated around the support part using the water flow generated by the rotation of the propeller as a driving force. As the tank rotates, the two arms swing up and down in response to fluctuations in the water level, constantly stirring and aerating the sewage throughout the tank uniformly regardless of the amount of water.

〔Example〕

The present invention will be described below with reference to the illustrated embodiments.
In Fig. 1, numeral 1 denotes an aeration tank or pond having a desired size, and in this embodiment it is rectangular like the one shown in Figs. 4 and 5, but it can also be of circular or other shape. Although the shape of the tank is not particularly limited, it is preferably circular or square in view of uniformity and ease of aeration.

In the center of the aeration tank 1, as shown in FIGS. 1 to 3, there is provided a swing arm 2 with a built-in slip ring 23, etc., and as shown in FIG. Post 3 established in the area
A self-priming stirring device 4 with a float is mounted on the tips of two arms 21, 21 that protrude in the radial direction of the rotating arm 2 on the opposing lower side surfaces of the rotating arm 2. Attach each. At this time, the self-priming stirring device 4 with a float moves up and down, that is, floats and sinks, according to changes in the liquid level in the tank, and the base end of each arm 21 has a rotating arm so that it is always maintained in a floating state at the water surface position. 2, it is pivotally supported via a pin 22 so as to be swingable in the vertical direction. Further, it is preferable that the arm 21 is extendable so that the self-priming stirring device 4 with a float can be set at an optimal position in the aeration tank, but it may be of a fixed length.

The self-priming stirring device 4 with a float has one or two floats 41, 41 fixed to a frame 42,
The frame 42 and the tip of the arm 21 are attached to each other in a swingable manner, and a stirring device 43 is placed on the frame 42. This self-priming stirring device is shown in FIGS. As shown in the figure. In the figure, 4
3a is a motor, and a hollow shaft 43 is directly connected to the motor.
The motor 43a and the hollow shaft 43b are housed in a cover 43c, and a stirring propeller 43d is fixed to the tip of the hollow shaft 43b protruding from the lower end of the cover 43, and a stirring propeller 43d is fixed to the tip of the hollow shaft 43b, and A hole is bored in the upper position to serve as an intake port, and an opening at the lower end located underwater is used as a diffuser hole. Therefore, when the propeller is rotated by the motor through the hollow shaft, air is sucked into the hollow shaft through the intake port formed in the hollow shaft inside the cover. This is because a water flow is generated in the axial direction of the lower end of the hollow shaft due to the rotation of the propeller 43d, which is always submerged in water below the liquid level, and as a result, a low pressure part (negative pressure) is formed in the liquid at the tip of the hollow shaft. During the water flow, air is sucked in through the intake port of the hollow shaft, flows down inside the hollow shaft, and is released into the water as minute bubbles through the air diffuser hole at the tip opening, which causes the liquid (sewage) to Aeration is performed simultaneously with stirring.

Furthermore, when the propeller 43d of the stirring device 43 is driven to rotate, the hollow shaft provided with this propeller is inserted into the wastewater 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 stirring device, generating a propulsive force throughout the float. This propulsive force acts on the self-priming stirring device with a float. However, the self-priming stirring device with a float is supported by the tips of two arms protruding in opposite directions on the outside of the rotating arm, so it rotates in the tank around the rotating arm. , aeration is performed while stirring the entire aeration tank.

1 to 3 show an embodiment in which a self-priming stirring device with a float is supported by a rotating arm established in the tank, and FIGS. An embodiment is shown in which the swing arm is suspended and supported by the frame 5, and both have the same effect.
Furthermore, the embodiment shown in FIG.
1 and 21 with different arm lengths.
By making the arm lengths different in this way, the two rotating self-priming stirring devices have different turning radii within the aeration tank. Therefore, since the two self-priming stirring devices each rotate on different diameter orbits to stir the wastewater, the wastewater in the aeration tank can be stirred more uniformly.

〔Effect of the invention〕

According to the present invention, a self-priming stirring device with a float is installed at the tip of two arms that protrude outward from the mutually opposing side surfaces of a swing arm that is supported so as to freely swing, and swings in the vertical direction. By facing each other, the stirring water flow generated by the stirring device is tangential, and the driving force is maximized without weakening, automatically rotating the tank, stirring and aerating the wastewater. This has the advantage that the stirring can be performed reliably and uniformly throughout the aeration tank by following water level fluctuations.Furthermore, the entire stirring device can be rotated within the aeration tank using only the motor installed in the stirring device. There are advantages such as simplification.

[Brief explanation of drawings]

FIG. 1 is a plan view showing the entire aeration device of the present invention;
Fig. 2 is a cross-sectional view of the same, Fig. 3 is a partial cross-sectional explanatory view of the swing arm section, Fig. 4 is a plan view of an embodiment with different arm lengths, and Figs. 5 to 7 are further different embodiments. Fig. 5 is a plan view, Fig. 6 is a sectional view, Fig. 7 is an explanatory diagram of the revolving arm, and Fig. 8 is a self-priming stirring device with a float. FIG. 9 is a side view thereof. 1...Aeration tank, 2...Swivel arm, 21...Slip ring, 3...Strut, 4...Self-priming stirring device with float, 41...Float, 42...Frame, 43...Stirring device, 43a...Motor, 4
3b...Hollow shaft, 43c...Cover, 43d...
Propeller, 5...frame.

Claims (1)

[Claims] 1. A propeller is attached to the lower end of a hollow shaft, and the waste water is stirred by the water flow generated by the rotation of the propeller, and the low pressure part generated at the tip of the hollow shaft with an intake port at the top is used. An aeration device that aerates wastewater in an aeration tank while stirring it using a self-priming agitation device with a float that diffuses gas into the water flow through an aeration hole of a hollow shaft, the self-priming agitation device with a float. The hollow shaft is tilted at a desired angle with respect to the water surface and supported by a float floating in the aeration tank, and an arm equipped with a slip ring is attached to a pin on the support section located approximately in the center of the aeration tank. The self-priming stirring device with a float is attached to the tip of this arm, and the self-priming stirring device with a float is attached to the tip of the arm, using the water flow generated by the rotation of the propeller as a driving force. An aeration device characterized in that the interior of the aeration tank is rotated around a support part.