JPH0576703A - Supernatant discharge equipment of water level follow-up type - Google Patents

Abstract

PURPOSE:To surely discharge supernatant in the basin following up water level in settling basins, etc. CONSTITUTION:A fixed waste pipe installed in the lower end of a flexible waste pipe equipped with a catchment trough 4 which sinks and floats following up water level by a float 3 is bent in the U-shape to lead water from the upper part of the basin to outside the basin. At the same time, a water supply valve 10 and a suction and exhaust valve 12 for generating and cutting off siphonage in the fixed waste pipe respectively are provided. Thereby, even when water level is changed and the upper end of the drain hose with the catchment trough is moved up and down by starting drainage, a control type feed cable and hose is not damaged because of being not moved and even if a flexible drain hose 2 is broken down, the control system is operable which can stop drainage by cutting off the siphonage to prevent the discharge of untreated effluent and the discharge of precipitated sludge.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for reliably draining clear water from a pond in a sedimentation pond or the like by following the water level.

[0002]

2. Description of the Related Art In a sedimentation basin of a sewage treatment plant, other sedimentation basins, etc., after the mixed sludge in the wastewater is precipitated, the supernatant water is discharged and the solid matter (contaminants) in the wastewater is discharged. Separated from water, and using a supernatant water discharge device as shown in FIG. 2 in the sand basin, water and solid matter are separated and taken out. The conventional clear water discharge device is equipped with a float 3 that follows the fluctuation of the water level in the pond at the upper part of the flexible telescopic drainage hose 2, and at the float 3 or at the water collecting trough 4 of the hose, an air supply valve 30 is provided. Is installed directly on the control panel 31 and the exhaust pump of the exhaust unit 32 installed on the ground side or the pressure switch 3
3 through a hose 34 to exhaust the air in the water collection trough 4 to form a siphon, and drain it to the drainage ditch 8 outside the pond via the fixed drainage pipe 5 connected to the lower end of the drainage hose 2. is doing.

[0003]

However, since the water is drained directly through the fixed drainage pipe connected to the lower end of the flexible telescopic drainage hose, the flexible telescopic drainage hose is deteriorated. If it is damaged by water, it will be directly supplied with water from the damaged part to run off, and further, at the damaged part, the settled sludge will be sucked and discharged together under the interface of the settled sludge. If this happens, drainage cannot be stopped even if the siphon is cut off at the top of the water supply hose. That is, it becomes inoperable.

Further, since a fixed drainage pipe is provided on the bottom of the pond to drain the water through the side wall of the bottom of the pond, repair and inspection cannot be performed unless the pond is emptied, and the upper part of the flexible telescopic drainage hose is used. Since the power supply or the control hose is connected to, the vertical movement of the drain hose may damage the power supply cable and the control hose. When the hose is damaged, air leaks from this damaged part and a siphon cannot be formed, so drainage becomes impossible.

It is an object of the present invention to eliminate the drawbacks of the prior art by forming a siphon by a water filling system in a fixed drainage pipe with the connecting portion of a telescopic drainage hose near the upper part of a pond.

[0006]

The present invention has been made to achieve the above object, and is a fixed type provided at the lower end of a telescopic drainage pipe provided with a water collecting trough that floats and sinks following the water level in a float. The drain pipe is bent in a U shape so as to be guided from the upper part of the pond to the outside of the pond, and a water supply valve for generating a siphon and a supply / exhaust valve for cutting the siphon are provided in this fixed drain pipe. Is the gist.

[0007]

[Function] A fixed drainage pipe connected to the lower end of the telescopic drainage hose is led out to the outside of the pond near the highest water level in the pond, and the fixed side drainage pipe is equipped with a water supply / exhaust valve and a water supply valve. Even if the water level fluctuates due to the start and the upper end of the drainage hose with water collection trough moves up and down, the control type power supply cable and hose do not move, so it will not be damaged. Is operable and the siphon can be turned off to stop drainage and prevent runoff and settling sludge discharge. In addition, since the siphon is of the type that feeds water into the drain pipe, it operates reliably.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention and the illustrated embodiments will be described below. In the figure, 1 is a sand basin or settling basin having a required size and shape, and a guide 20 is provided at a predetermined position in the sand basin 1.
A flexible telescopic drainage hose 2 is provided that is supported by the vertical direction by means of a water collection trough 4 that covers the upper opening of the hose at the upper end of the hose 2, and the upper end of the hose 2. And a float 3 that floats the water, and a fixed drainage pipe 5 is attached to the lower end of the telescopic drainage hose 2 of the required length.
Connect one end of.

The drain pipe 5 is bent into a U shape, the lower part thereof almost reaches the bottom of the pond, and the upper part thereof reaches the upper part of the pond, that is, a position close to the highest water level HWL. It penetrates the side wall, leads to the outside of the pond, and bends downward almost vertically outside the pond to form a vertical drainage pipe 6, which allows a siphon to be formed in this fixed air drainage pipe 5, 6 A drain valve 7 is connected to a part or near the lower end of the drain pipe 6 so that drain water from the vertical drain pipe 6 is discharged to a drain groove 8.

Further, a water supply pipe 9 having a water supply valve 10 is connected to an upper part of the drainage pipe 5, a water supply / exhaust valve 12 is connected to an upper end thereof, and a ventilation pipe 11 having a flow switch 13 is connected to a lower part thereof. The opening / closing valve operation is performed via a control circuit (not shown) according to the water level detected by the water level gauge 14 provided in the pond with the supply / exhaust valve 12 and the drainage valve 7.

Next, the operation of the discharge device of the present invention will be described. When the water level meter 14 detects that the water level of the clear water has reached the preset maximum water level HWL, the drain valve 7 is closed, and the water supply valve 10 and the air supply / exhaust valve 12 are opened. As a result, water is supplied into the vertical drain pipe 6 and the drain pipe 5. When water is supplied to the pipes 6 and 5, the air in the pipes 6 and 5 is discharged from the opened supply / exhaust valve 12, and the drain pipes 6 and 5 are filled with water. When water is supplied into the drain pipes 5 and 6, and the water is filled, the flow switch 13 operates to close the air supply / distribution valve 12 and the water supply valve 10, and when the drain valve 7 is opened, the drain is discharged from the lower end of the drain pipe 6. To be done. When the water in the drainage pipe 6 is discharged, a siphon is generated in the pipes 5 and 6, and the suction force by this drainage action also acts in the telescopic drainage hose, so that the water is supplied sequentially from the water collection trough 4. And then drained.

When drainage is started from the maximum water level HWL and the water level drops, the float 3 also descends following this water level fluctuation, and the telescopic drain hose 2 also shrinks. When the float or the water collection trough 4 reaches the minimum water level LWL, the water level gauge 14 detects this and opens the supply / exhaust valve 12. As a result, air is sucked into the drain pipes 5 and 6, the siphon inside the pipe is cut off, and the water supply from the water collection trough is stopped. The drain pipe 7 is closed when the siphon is cut off.

[0013]

According to the present invention, the fixed drainage pipe provided at the lower end of the telescopic drainage hose is connected near the maximum water level to lead it out of the pond, so that the drainage pipe can be repaired and inspected without emptying the pond. In addition, since a fixed drainage pipe is equipped with a control valve such as a water supply valve and an air supply / exhaust valve, it does not move when the water level changes as in the past, so the power supply cable, hose, etc. of the controller will be damaged. It is reliable because the siphon is filled with water. In addition, the fixed drainage pipe connected to the drainage hose is led out of the pond near the maximum water level, so even if the hose is damaged due to deterioration of the telescopic drainage hose, the control system is on the fixed side. The drain valve can be controlled, and runoff can be prevented.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a water level following type clear water discharge device of the present invention.

FIG. 2 is an explanatory view showing a conventional discharging device.

[Explanation of symbols]

 1 sand set basin 2 telescopic drainage hose 3 float 4 water collection trough 5 drainage pipe 6 vertical drainage pipe 7 drainage pipe 10 water supply valve 12 supply / exhaust valve 13 flow switch

Claims (1)

[Claims] 1. A fixed drainage pipe provided at the lower end of a telescopic drainage pipe equipped with a water collecting trough that floats and sinks following the water level in a float, is bent in a U shape and is guided from the upper part of the pond to the outside of the pond. A water level following type clear water discharge device is characterized in that a water supply valve for generating a siphon and a supply / exhaust valve for cutting the siphon are provided in the fixed drainage pipe.