JPS638467Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a circulating waterway type wastewater treatment device, and more particularly, to a circulating waterway type wastewater treatment device in which the uneven flow of an aeration channel is corrected by a rectifying plate.

For example, as shown in Figures 1 and 2,
A waterway inner wall (partition wall) 13 is provided in the central longitudinal direction of the circulation waterway type aeration tank 11, and a circulation aeration waterway is formed so that the flow direction is opposite on both sides of this inner wall 13, and wastewater such as sewage and sewage is aerated. Circulating waterway type wastewater treatment devices have been known for a long time. The vertical aerator 15 serves not only to supply oxygen to the mixed liquid in the water channel but also to create a flow in the mixed liquid in the water channel, thereby mixing and agitating the mixed liquid in the water channel.

However, the conventional circulating waterway type wastewater treatment apparatus has a problem in that it is not possible to generate an even and sufficient flow in the waterway, as shown by the arrows in FIG. That is, aerator 1
The higher the rotational speed of the outer wall 11, the stronger the tendency for the flow to be uneven, where only the flow velocity on the outer wall 11 side is predominant. On the other hand,
On the contrary, near the center wall (partition wall) 13, the flow stagnates or flows backwards, which has the disadvantage that sludge and the like tend to accumulate at the bottom of the center wall.

The present invention has been made in order to eliminate the above-mentioned drawbacks of the conventional technology, and provides a wastewater treatment device that can correct the unbalanced flow in the aeration waterway and prevent the accumulation of sludge and the like on the bottom of the waterway. The purpose is to

Therefore, the present invention provides a circulating waterway type wastewater treatment device equipped with a vertical aerator, in which a flow pushed out from the aerator toward the outer wall of the waterway is directed toward the inner wall of the waterway in the vicinity of the outflow waterway side of the aerator. It is characterized by disposing one or more rectifying plates as shown in FIG.

An embodiment of the present invention will be described below with reference to FIGS. 3 and 4.

FIG. 3 is a partial plan view of the vicinity of the vertical axis aerator 15, and FIG. 4 is a sectional view thereof. Here, it is the outflow channel side 12a of the aeration channel, and the vertical axis aerator 1
A rectifying plate 17 is disposed near the vertical aerator 15 so as to direct the flow (indicated by dotted lines in the figure) from the vertical aerator 15 toward the inner wall (partition wall) 13 of the water channel. In this way, the rectifier plate 17 deflects the flow pushed out by the aerator toward the outer wall 11 inward, so it is provided near the aerator 15, preferably at approximately the center of the outflow channel 12b, and at a distance from the aerator 15. The aerator side end of the rectifier plate 17 is 1 to 3 of the aerator diameter (φ ₁ ).
It is placed in such a position that it doubles. Further, the current plate 17 preferably has a width of 0.5φ to 1.0φ and a height approximately equal to the water depth of the channel.

In the embodiment shown in FIGS. 3 and 4, a flat rectifying plate 1 made of steel or other material is attached to a shaft 19 rotatably supported by a bearing or the like.
7 is attached, and the rectifying plate 17 can be rotated in any direction using the direction specifying lever 21 (indicated by the arrow ←→ in FIG. 3). By fixing the lever 21, the angle can be set. ing. By using such a movable current plate, the inclination of the current plate can be immediately set in response to the situation at the site, and the flow rate toward the inner wall can be increased, but of course, the current plate may be of a fixed type.

Further, as shown in FIG. 5, a plurality of rectifier plates 17
a, 17b, and 17c may be provided.

According to the present invention, a portion (typically 1/5 to 1/3
degree) is received by the current plate and deflected inward from the center of the waterway. As a result, the flow velocity distribution in the cross section of the water channel becomes uniform, and the flow velocity near the central separation wall of the circulation tank can be increased in particular. For example, according to experiments conducted by the present inventors, by using the movable rectifying plate shown in Figure 3, 1/2 of the flow toward the outer wall can be reduced.
When 5 to 1/3 of the amount was received, the flow toward the central separation wall, which was 10 cm/sec when no current plate was used, became more than twice as fast, preventing sludge from depositing on the bottom near that area. The results were obtained.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a circulating waterway type wastewater treatment device, and FIG. 2 is a longitudinal sectional view thereof. 3 and 5 are partially enlarged views of the vicinity of the aerator of the circulating waterway type wastewater treatment apparatus of the present invention, and FIG. 4 is a sectional view of FIG. 3. 10... Circulating waterway type aeration tank, 11... Waterway outer wall, 13... Waterway inner wall (partition wall), 15... (vertical axis) aerator, 17, 17a, 17b, 17c
……rectifier.

Claims (1)

[Scope of utility model registration request] In a circulating waterway type wastewater treatment device equipped with a vertical axis aerator, one or more are installed near the outflow waterway side of the aerator so as to receive the flow pushed out from the aerator toward the outer wall of the outflow waterway and direct it toward the inner wall of the waterway. A circulating waterway type wastewater treatment device characterized by a rectifying plate.