JPH0628162Y2 - Supernatant discharge device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a supernatant discharge device, and more particularly to a supernatant discharge device used in an activated sludge device or the like.

[Conventional technology]

The activated sludge system has raw water inflow, aeration, precipitation, and supernatant liquid discharge processes. Among them, the supernatant liquid discharge process discharges the separated upper layer water to the outside quickly and reliably, and It is required that the liquid does not flow out except in the clear liquid discharging step.

As a conventional supernatant liquid discharge mechanism, a weir (opening) is provided at a portion where the supernatant liquid is located on the side surface of the liquid tank, and discharge is performed by overflow, or an overflow arm is attached to a movable joint and the overflow liquid is discharged. An example is one in which the supernatant liquid is discharged by mechanically moving the arm up and down.

However, in such a conventional technique, it is necessary to provide a scum inflow prevention plate (baffle) in order to prevent scum from being mixed in the supernatant liquid, and in the case of overflow, the treated water amount is There were drawbacks such as limitations.

[Problems to be solved by the device]

In order to solve such a drawback, the present inventor has a siphon tube integrally provided with a buoyancy chamber capable of sending and receiving air and a siphon break means provided in the siphon tube. The above-mentioned supernatant discharging device was proposed (Japanese Utility Model Application No. 60-59910).

However, this device can obtain a clear supernatant without the need for a scum inflow prevention plate, and can discharge a relatively large amount of supernatant, but the operations such as siphon formation and siphon break are complicated. And the drawback of winding up the activated sludge in the lower layer of the reaction tank.

The object of the present invention is to solve the above-mentioned drawbacks of the prior art, to discharge a large amount of liquid quickly and easily without mixing scum or the like in the supernatant liquid, and to easily operate it. It is to provide a clear liquid discharging device.

[Means for Solving the Problems]

The present invention provides a buoyancy chamber connected to an air feeding and discharging means, a vertical supernatant discharge pipe integrally provided in the buoyancy chamber, and a scooping weir on the upper part of the supernatant discharge pipe. A water collecting pipe connected so as to form, and an air chamber provided above the buoyancy chamber, the lower end of the supernatant liquid discharge pipe is connected to a telescopic pipe, and the supernatant liquid discharge pipe is formed. Is a supernatant liquid discharging device, wherein an upper end portion thereof is open to the atmosphere and a side wall of the air chamber forms a space portion for inserting a guide pipe.

In the present invention, it is preferable that the horizontal hole provided at the lower end of the water collection pipe has a rounded curved surface.

Hereinafter, the present invention will be described in more detail with reference to the embodiments shown in the drawings.

〔Example〕

FIG. 1 is a schematic sectional view of a supernatant discharge mechanism showing an embodiment of the present invention. This device comprises a buoyancy chamber 3 connected to an air supply / exhaust means (pipe 17 and valve 19), an air chamber 5 provided above the buoyancy chamber 3, and the buoyancy chamber 3
A vertical supernatant discharge pipe 7 and a water collecting pipe 11 having a vertical portion connected to the supernatant discharge pipe 7 in a T-shape (or octopus-foot type); Clear liquid discharge pipe 7
Has a space 6 formed by the side wall of the air chamber 5 opening the upper end of the liquid chamber to the atmosphere, and the lower end of the liquid discharge pipe 7 is connected to a telescopic pipe 9 fixed to the lower portion of the liquid tank 27. .

The lower part of the buoyancy chamber 3 is open to the inside of the tank, and the means for feeding and discharging the air to and from the buoyancy chamber 3 are connected to the conduit 17 and the valve 19 having one end open to the buoyancy chamber, and the conduit 17. And a pressurized air source (not shown). The volumes of the buoyancy chamber 3 and the air chamber 5 are such that the connection between the water collection pipe 11 and the liquid discharge pipe 7 is the liquid level of the supernatant liquid 23 when the water collection pipe 11 has its lower end immersed in the liquid during air feeding. Above (second
(State shown in the drawing), and when the air is discharged, the water collecting pipe 11 and the connecting portion between the water collecting pipe 11 and the liquid discharging pipe 7 are all settled below the liquid surface (state shown in FIG. 1). The lower end of the water collection pipe 11 connected to the end of the discharge pipe 7 is adjusted so as to be below a predetermined position from the liquid level 23 so as to form a so-called gouge weir.

Since the lower end of the water collection pipe 11 has an opening in the horizontal direction, the supernatant liquid is collected from the horizontal direction as much as possible, and a clearer supernatant liquid can be obtained. Further, in this case, by providing a rounded straightening plate at the bottom of the water collection pipe, the water collection pipe 1
The amount of liquid retained in 1 is reduced, and it is also effective for sludge on the inner surface of the water collection pipe 11.

The shape of the cross section of the water collecting pipe 11 is not particularly limited, but a circular shape or a rectangular shape is preferable, and a rectangular shape is preferable in view of increasing the size.

In the apparatus having the above-described structure, first, when preparing the supernatant liquid discharge (collection), the valve 19 is opened and the buoyancy chamber 3 is allowed to settle below the liquid surface by its own weight as shown in FIG. The liquid flows from the discharge pipe 7 into the discharge pipe 7, and the discharge of the liquid is started through the discharge pipe 7 and the expansion pipe 9.

Next, when the liquid level drops, air is supplied to the buoyancy chamber 3 so that the upper end of the supernatant liquid discharge pipe 7 and the water collecting pipe 11 are floated to a position where they are exposed to the atmosphere through the space 6. The outflow of the supernatant liquid is stopped by blocking the siphon formed between the water collection pipe 11 and the supernatant liquid discharge pipe 7.

Then, returning to the first operation (FIG. 1), the same operation is repeated to move the buoyancy chamber 3 up and down to suck and discharge the supernatant.

According to the above-mentioned embodiment, since the upper end of the supernatant liquid discharge pipe 7 is configured to open to the atmosphere through the space 6,
Since a series of operations associated with the start and stop of the discharge of the supernatant can be performed only by feeding and discharging the air into the buoyancy chamber 3, the operation is extremely simple and the apparatus can be simplified. Further, by providing, for example, a guide pipe in the space portion 6, it is possible to prevent the supernatant liquid discharging device from swaying to the left and right and facilitate the folding of the expansion joint.

Further, according to the present embodiment, since the water collecting pipe 11 forms a so-called moguri weir, a suspended liquid such as scum is not mixed in the supernatant liquid, and a clear liquid can be collected. 1
By adjusting the position of the lower end of 1, the discharge level of the supernatant can be easily adjusted.

[Effect of device]

According to the present invention, it is possible to obtain a clear supernatant liquid in which suspended matters such as scum are not mixed in by a very simple operation of feeding and discharging air into the buoyancy chamber, and moreover, the activity of the lower layer of the reaction tank can be obtained. It is possible to eliminate the rolling up of sludge and to discharge a relatively large amount of supernatant liquid.

[Brief description of drawings]

1 and 2 are explanatory views showing the operation of the supernatant discharge device of the present invention. 1 ... Supernatant discharge device, 3 ... buoyancy chamber, 5 ... air chamber,
6 ... Space, 7 ... Supernatant discharge pipe, 9 ... Telescopic pipe, 1
1 ... water collecting pipe, 17 ... conduit, 19 ... valve, 23 ...
…Liquid surface.

Front page continuation (72) Creator Takashi Kizen 5-4-18 Tokiwa, Urawa City, Saitama Prefecture (72) Yuya Yamahata 433-23 Nishihiro, Ichihara City, Chiba Prefecture (72) Noboru Takemura Kosugeya, Sakae Ward, Yokohama City, Kanagawa Prefecture Town 951-53 (72) Inventor Takanobu Shiozaki 4-15 Tatsumi Taito, Ichihara-shi, Chiba (56) Bibliography 61-175216 (JP, U) 55-171305 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A buoyancy chamber connected to air feeding and discharging means, a vertical supernatant liquid discharge pipe integrally provided in the buoyancy chamber, and a moor weir located above the supernatant liquid discharge pipe. Has a water collecting pipe connected to form a buoyancy chamber and an air chamber provided above the buoyancy chamber, the lower end of the supernatant liquid discharge pipe is connected to a telescopic pipe, and the supernatant liquid discharge The supernatant liquid discharging device, wherein the upper end of the tube is open to the atmosphere, and the side wall of the air chamber forms a space for inserting the guide pipe.