JPH0120970Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a drainage device for a sewage treatment tank that can effectively discharge the treated supernatant liquid in the sewage treatment tank without the inflow of sludge.

Conventionally, the drainage system of batch type activated sludge treatment equipment, in which sewage flows into a sewage treatment tank, undergoes aeration and precipitation treatment, and then discharges the supernatant liquid, has an extremely complicated structure, and sludge is mixed into the treated liquid during drainage. There were drawbacks such as the influx of

The purpose of this invention is to eliminate the above-mentioned drawbacks, and to provide a drainage device for a sewage treatment tank that has an extremely simple structure, prevents sludge from flowing in during aeration, and also functions as an ON/OFF valve for supernatant drainage. shall be.

An embodiment of this invention will be described below with reference to the drawings.

For example, sewage treatment tank 1 of a batch activated sludge treatment device
As shown in FIG. 1, the tank has a drain pipe 2 provided on its side wall, a supernatant liquid intake pipe 3 rotatably arranged in the sewage treatment tank 1, and a fine bubble pipe arranged at the bottom. An air diffuser 12 is provided to diffuse air.

As shown in FIGS. 2 and 3, the drain pipe 2 is
A drain port 4 having a predetermined shape (semicircular in this embodiment) is provided at the end of the sewage treatment tank 1 side.

In addition, both ends of the supernatant liquid intake pipe 3 are connected to the sewage treatment tank 1.
It is rotatably arranged via a bearing 7 and a fitting 6 fixed to the side wall of the drain pipe 2 by an anchor bolt 5, and one end thereof is placed opposite to and adjacent to the drain port 4 of the drain pipe 2. As shown in FIGS. 2 and 3, a drain port 4 is provided at one end of the tube by rotating the supernatant liquid intake pipe 3.
A through hole 8 having a predetermined shape (semicircular in this embodiment) is provided so that waste water can be discharged only when the condition is met. In addition, a first
As shown in the figure, a supernatant liquid intake port 9 formed in the form of a groove or a small hole as shown in FIG. 4 is bored along the axial direction. The supernatant liquid intake pipe 3 is rotated at appropriate times by a chain, a belt 11, etc. driven by a drive unit 10.

The shapes of the drain port 4, the communication port 8, and the supernatant liquid intake port 9 are not limited to those in the above embodiments, and may be of any shape as long as they can fulfill their respective functions. Also, in Figure 1,
The valve shown on the right side of the sewage treatment tank 1 is for emergency use and is normally kept open.

Next, the operation will be explained. During aeration, as shown in FIG. 5a, the supernatant liquid inlet tube 3 submerged in the supernatant liquid is driven by the drive unit 10, and the supernatant liquid inlet port 9 is positioned downward. Rotate the angle. This prevents sludge from accumulating in the intake pipe 3 during aeration, and this rotation also closes the drain port 4 and the communication port 8 to each other as shown in Figure 3a. Therefore, there is no need to provide a separate valve. On the other hand, during drainage, as shown in Figure 5b,
If the intake pipe 3 is rotated so that the supernatant fluid intake port 9 is upward, the drain port 4 and the conduction port 8 are aligned as shown in FIGS. 2 and 3b, and as shown in FIG. As shown in b, the supernatant liquid taken in from the supernatant liquid intake port 9 can be effectively discharged.

Therefore, by rotating the supernatant liquid intake pipe 3, it is possible to prevent sludge from flowing in during aeration, and it also functions as a valve for turning on and off the supernatant liquid discharge.

Incidentally, the drainage device for a sewage treatment tank of this invention is not limited to a batch type sewage treatment device, but can be used in other sewage treatment devices.

As described above, this invention has an extremely simple structure that has extremely excellent effects such as preventing sludge from flowing out during aeration and also functioning as a valve to turn on and off the supernatant liquid drainage. .

[Brief explanation of the drawing]

Figure 1 is a vertical sectional view of one embodiment of this invention, Figure 2
The figure is an enlarged vertical cross-sectional view of the same main part, Figure 3 is a view taken in the direction of the arrow in Figure 2, Figure 4 is a partial plan view of another embodiment of the supernatant liquid intake pipe, and Figure 5 is the figure shown in Figure 1. A sectional view taken along line A-A of FIG. 1... Sewage treatment tank, 2... Drain pipe, 3... Supernatant liquid intake pipe, 4... Drain port, 8... Conduction port, 9...
Supernatant fluid inlet, 10... drive unit.

Claims (1)

[Scope of utility model registration request] A drain pipe provided on the side wall of the sewage treatment tank and having a drain port of a predetermined shape; and a supernatant liquid rotatably arranged in the sewage treatment tank and having one end adjacent to the drain port of the drain pipe. a supernatant liquid intake tube that is provided on the peripheral wall of the supernatant liquid intake tube and that takes in the supernatant liquid when the supernatant liquid intake tube is submerged in the supernatant liquid; an inlet, a drive unit for rotating the supernatant liquid intake tube by a predetermined angle, and a driving unit provided at the one end of the supernatant liquid intake tube, and the supernatant liquid intake tube is rotated to rotate the supernatant liquid intake tube at a predetermined angle. A drainage device for a sewage treatment tank, comprising a conduction port having a predetermined shape that matches the drainage port of the drain pipe and allows wastewater to be drained when the liquid intake port faces upward.