JPH078004Y2 - Clear water extraction device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a supernatant water withdrawal apparatus suitable for a treatment tank whose water surface fluctuates, such as batch sewage treatment, sedimentation and concentration treatment.

(Prior Art) Conventionally, in this type of sewage treatment, a supernatant water withdrawal device has been used that is capable of being discharged in response to a large fluctuation in the water level in the tank. This device has a natural flow-down discharge method and a forced pump discharge method. In the former method, for example, a float method as disclosed in Japanese Utility Model Publication No. 59-21850 is often adopted, and in the latter method, for example, the Japanese Utility Model Publication No. 62-.
The thing of 31123 publication etc. are known.

(Problems to be solved by the invention) However, in the above-mentioned conventional device, there are many joints and movable parts in the water, which causes problems. There are also problems of deterioration and damage. In addition, float type floats on the water surface are directly affected by the fluctuation of the water surface during aeration in the tank, and it is easy to wind up not only the supernatant water but also the part of the sludge that has settled. Have a problem.

The present invention was made in order to solve the problems in the above-mentioned conventional method.By adopting a method in which the sliding part is not provided in water, the device is stabilized during aeration, and clear water is kept in good condition. An object of the present invention is to provide a supernatant water withdrawal device that can be withdrawn, does not accumulate sludge in the device, has a simple mechanism, and does not require power.

(Means for Solving the Problems) The structure of the present invention for achieving the above object will be described with reference to the drawings corresponding to the embodiments. The present invention provides a supporting member 2 provided on a processing tank 1. , The base water is attached to the supernatant water drawing pipe 5 which is rotatable about a horizontal axis, while the upper surface is provided with a groove 8 for introducing the supernatant water, and a box-shaped float 7 whose lower surface is opened can be opened and closed. Extraction pipe 10 and scum stopper
12 is provided, and a water collector 6 in which a suction pipe 14 having a lower end protruding into the intake groove 8 is erected is formed, and the suction pipe 14 is attached to the water collector 6 and the supernatant water withdrawal pipe is provided. It is characterized in that it is rotatably connected to and attached to the tip of 5.

(Operation) Next, the operation of the device of the present invention will be described. Since the float 7 of the water collector 6 is formed in a box shape with the lower surface open, if the valve 9 of the air vent pipe 10 is closed, the float 7
The inner upper part serves as an air reservoir to generate buoyancy, and the water collector 6 is positioned on the water surface part due to its balance with its own weight, and moves vertically as the water level changes. Since the water collector 6 is attached to the tip of the supernatant water withdrawing pipe 5 whose base end is rotatably attached to the support member 2 on the tank 1, as shown in FIG. It moves on the tilting trajectory b of 5.

The water collector 6 is in a state in which the valve 9 of the air vent pipe 10 is closed in the initial process of inflowing raw water, as shown in FIG.
As shown in, the upper part inside the float 7 serves as an air reservoir, and the water collector 6 is set at a position where the upper surface of the float 7 is slightly immersed below the water surface. Then, when the process moves to the aeration step, the air for aeration also flows into the float 7, so that the amount of air in the float 7 increases, and as shown in FIG.
The surplus air is discharged from the cut grooves 7c, 7c of the side plate 7b, and the water collector 6 maintains a predetermined floating position.
In this case, the stabilizer 11 will be located on the water surface,
The fluctuation and vibration of the water collector 6 due to the wave motion of the water surface accompanying aeration will be suppressed. Further, since the water collector 6 is in the floating position, the supernatant water withdrawal pipe 5 and the limit switch 18 are separated from each other.

After the completion of the aeration process, the supernatant water discharging process is started. At that time, the solenoid valve 9 is opened to bleed the air in the float 7 from the air bleeding pipe 10. As a result, the air in the float 7 decreases and the water collector 6 sinks. Then, as shown in FIG. 4 (c), when the upper surface of the float 7 is slightly submerged below the water surface, the limit switch 18 is closed due to the tilting of the clear water drawing pipe 5 downward, and the solenoid valve 9 is closed. The air discharge from the discharge pipe is cut off, and the sinking position is maintained. The opening / closing operation of the solenoid valve 9 can be performed by setting a timer for the elapsed time from the end of aeration instead of using the limit switch. In this state, since the upper surface of the float 7 is slightly below the water surface, the supernatant water flows into the intake groove 8 through the gap a between the float 7 and the scum stopper 12. Therefore, when the pump connected to the shaft pipe 4 is operated, the supernatant water is taken out of the tank from the suction pipe 14 through the supernatant water drawing pipe 5 and the shaft pipe 4. In this case, since the scum stopper 12 projects higher than the upper surface of the float 7, inflow of scum floating on the water surface is prevented.

As the clear water is drawn out, the water surface is gradually lowered, and the water collector 6 is also lowered accordingly. As shown in FIG. 4 (d), the supernatant water is drawn out until the lower part of the float 7 reaches the sludge c that has settled to the bottom of the tank. In this case, the surface of the water is very close to the sludge tank c that has settled, but a stabilizer is provided on the outer periphery of the float 7.
Since 11 is projected, the sludge is prevented from being wound up due to the flow of the supernatant water sucked up from the suction pipe 14.

After the removal of the supernatant water, the process proceeds to the raw water inflow process, which is the beginning of the cycle, and the above operation is repeated thereafter.

Embodiment An embodiment of the device of the present invention will be described below with reference to the drawings.

In FIGS. 1 to 3, reference numeral 1 denotes a treatment tank for repeating activated sludge treatment by repeating a cycle of an aeration step, a precipitation step and a discharge step, which is provided with a waste water supply means and an aeration means although not shown.

At the upper end of the processing tank 1, a supporting member 2 of the apparatus according to the present invention is installed across the processing tank 1. A shaft pipe 4 which is rotatable around a horizontal axis via a rotatable joint 3 is attached to the support member 2, and a clear water drawing pipe 5 extending in a perpendicular direction is connected to one end of the shaft pipe 4. The other end is connected to a vacuum pump or a self-priming pump provided outside the tank by appropriate means.

Reference numeral 6 denotes a water collector attached to the tip of the supernatant water withdrawing pipe 5, which is provided with a box-shaped float 7. The float 7 has a flat rectangular shape, and the side plates 7b and 7b provided with a number of cut grooves 7c and 7c on the lower end are vertically provided around the top plate 7a formed on the inclined surface such that the central portion becomes higher. An intake groove 8 for receiving clear water is formed in the central portion of the top plate 7a, and a solenoid valve 9 (see FIG. 2) is provided at an appropriate position of the top plate 7a.
An air bleeding pipe 10 is provided so as to communicate with the inside of the float 7. The float 7 is attached to the outer circumference of the float 7.
A stabilizing plate 11 is provided in the horizontal direction to improve the stability of the sludge and to prevent the sludge from rolling up. Further, a scum stopper is provided above the float 7 so as to surround the float 7 and project upward at a required distance from the outer circumference of the float 7.
12 is attached via brackets 13 and 13, and a clear water circulation gap a is formed between the outer peripheral upper end of the float 7 and the lower end of the scum stopper 12. In addition, in the center of the upper surface of the float 7, a lower end of the float 7 is inserted into the drawing groove 8 and a suction pipe 14 for clear water is attached. The attachment is performed by a fret 15 and springs 16 and 16 provided on the suction pipe 14. It is connected to the top plate 7a via the spring 16 and the elasticity of the springs 16 allows the suction tube 14 and the float 7 to freely swing.

In the water collector 6, the upper end of the suction pipe 14 is connected to the tip of the supernatant water withdrawing pipe 5 via a universal joint 17. In addition, a limit switch is provided on the support unit 2.
18 is provided so as to project in the direction of the water collector 6, and when the supernatant water withdrawing pipe 5 is in a predetermined tilt posture with its tip end lowered, the supernatant water withdrawing pipe 5 comes into contact with the limit switch 18 to cause electromagnetic interference. Air vent pipe that opens and closes valve 9 and communicates with float 7
It is designed to be able to switch between 10 open / closed states.

(Effects of the Invention) As described above, according to the device of the present invention, the float of the water collector is formed as a box type with an open lower surface, and an air vent pipe is provided to utilize the air in the float and the air at the time of aeration. Thus, it is possible to automatically adjust the submerged and floating positions of the water collector at the time of aeration and in the supernatant water withdrawal pipe, and the supernatant water can be smoothly and efficiently withdrawn. In addition, the stabilizer provided on the float can reduce the swing and vibration of the water collector to stabilize it, prevent the sludge from rolling up, and increase the discharge amount of the supernatant water to enhance the treatment capacity. be able to. And since each sliding part such as the connecting part between the water collector and the supernatant water drawing pipe and the connecting part between the supernatant water drawing pipe and the shaft pipe is exposed on the water surface, there are few troubles and the water collecting device It has many advantages such as requiring no special power for operation and allowing the device to be simple and easy to operate.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of the device of the present invention, FIG. 2 is a plan view thereof, FIG. 3 is an enlarged cross-sectional view showing a portion of the water collector, and FIGS. It is explanatory drawing which shows the operating state of a water collector one by one. 1 ... Treatment tank, 2 ... Supporting member, 4 ... Axial pipe, 5 ... Supernatant water drawing pipe, 6 ... Water collector, 7 ... Float, 8 ... Intake groove, 10 ... Air bleeding pipe, 11 …… Stabilizer, 12 …… Scum stopper 14 …… Suction tube, 18 …… Limit switch

Claims (1)

[Scope of utility model registration request] 1. A clear water drawing pipe whose base end is rotatable about a horizontal axis is attached to a support member provided on a treatment tank, and on the other hand,
A box-shaped float with a clear water intake groove on the upper surface and an open lower surface was provided with an air vent pipe and scum stopper that can be opened and closed, and a suction pipe with the lower end protruding into the intake groove was erected. A supernatant water withdrawing device, characterized in that a water collector is formed, and the suction tube is attached to the water collector by being rotatably connected to the tip of the supernatant water withdrawing tube.