JPH08914A - Opening and closing type water gathering apparatus and supernatant liquid discharge device - Google Patents

Abstract

PURPOSE:To provide a supernatant liquid discharge device and an opening and closing type water gathering apparatus, positioned above the surface of a liquid in an aeration process unnecessary to scatter water to the surface of a liquid for the purpose of removing the floated matter on the surface of a liquid even when allowed to fall to the surface of a liquid before the start of a water gathering and discharge process, and capable of certainly preventing the discharge of the floated matter to the outside of the system. CONSTITUTION:An opening and closing type water gathering apparatus 10 consists of a water gathering vessel 20 and the drain means 30 arranged in the water gathering vessel and the water gathering vessel 20 has bottom surfaces 21D, 22D protruding downwardly in a wedge shape or a bottom surface curved downwardly and an openable and closable supernatant liquid inflow part 23 is provided to the almost lowermost part of the bottom surfaces.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention can collect and discharge the supernatant liquid in a drainage treatment tank such as a batch type activated sludge treatment device, and can effectively prevent the discharge of suspended matter such as scum. The present invention relates to a supernatant liquid discharging device and an opening / closing type water collecting device.

[0002]

2. Description of the Related Art In recent years, a batch type activated sludge method has been attracting attention as a wastewater treatment method. In this batch activated sludge method, the same drainage treatment tank serves as both the aeration tank and the sedimentation tank.
In the batch activated sludge method, the following steps are generally repeated as a series of treatment cycles. (A) A sewage inflow step of flowing sewage containing pollutants into the wastewater treatment tank (B) Aeration of the sewage to mix the activated sludge in the sewage treatment tank with the inflowing sewage, and air ( (A) Separation step to stop the aeration and settle sludge to separate supernatant liquid (D) Drainage treatment tank Water collection and discharge process to collect and discharge the supernatant

In this batch activated sludge method, the most important step is to collect and discharge the supernatant. At the time when the separation process of sludge and supernatant liquid is completed, sludge is accumulated at the bottom of the drainage treatment tank. On the other hand, suspended matter is present in the upper part of the supernatant. The suspended solids are sludge and oil with air bubbles,
It is a foreign substance such as so-called scum such as particles having a low specific gravity or dust.
Therefore, in the process of collecting and discharging the supernatant liquid, the most important point is how to collect and discharge only the supernatant liquid without discharging the accumulated sludge and suspended matters to the outside of the system.

Various methods and devices for collecting and discharging the supernatant have been proposed. For example, a fixed type supernatant liquid in which a plurality of fixed water collecting portions are provided at a predetermined height position in the drainage treatment tank and the drain valves provided in each water collecting portion are sequentially opened to discharge the supernatant liquid. There is a discharge device and a pump-type supernatant liquid discharging device that sucks and discharges the supernatant liquid using a submersible pump. However, due to reasons such as the ability to follow fluctuations in the liquid level, the stability of the sludge interface, and equipment costs, float type supernatant liquid discharge devices that follow the vertical movement of the liquid level and constantly collect water from near the liquid level are widely used. It is used. This float type supernatant liquid discharge device is provided with an overflow weir and a moguri weir so that suspended matter does not flow into the water collecting portion.

In the float type supernatant liquid discharging device, it is necessary to prevent sewage from flowing into the supernatant liquid discharging device in the aeration process. Therefore, in the conventional supernatant liquid discharging device, a lifting device equipped with a wire or an elevating device using a hydraulic cylinder is attached, and the supernatant liquid discharging device is positioned above the liquid surface in the aeration process. There is. Then, before the step of collecting and discharging the supernatant liquid in the drainage treatment tank is started, the supernatant liquid discharging device is lowered to float on the liquid surface.

At this time, floating substances such as scum attached to the lower part of the supernatant liquid discharging device and floating substances floating on the water surface when the supernatant liquid discharging device descends and reaches the liquid surface Water is sprayed on the liquid surface in the region where the supernatant liquid discharging device descends so that the suspended matter is removed from the region so that it does not flow into the clear liquid discharging device and is not discharged to the outside of the system. When such water is not sprayed, the suspended matter flows into the supernatant discharger immediately after the start of collecting and discharging the supernatant, and the discharged supernatant is mixed with the suspended matter. Therefore, it becomes necessary to treat the supernatant liquid again immediately after the start of discharge, which complicates the structure of the batch type activated sludge treatment device and increases the manufacturing cost of the device.

[0007]

In a general sludge treatment device, the liquid level in the tank is substantially constant or only slightly fluctuates. However, in the case of the batch type activated sludge treatment device, the fluctuation of the liquid level in the drainage treatment tank is large, 0.5 m-
It may fluctuate by as much as 2 m. Therefore, it is difficult to accurately control the spraying of water on the liquid surface in the region where the supernatant liquid discharging device descends.

In the conventional float type supernatant liquid discharging device, water is sprayed even when the supernatant liquid discharging device descends and comes into contact with the liquid surface until it is arranged at a predetermined position. Even if it does, it is difficult to surely prevent floating substances from flowing into the supernatant discharge device.

[0009] A float type supernatant liquid discharging device of the type which is floated on the liquid surface in the aeration process is practically used in 3-kaijunhei 566.
It is known from JP-A No. 05 or JP-A-4-250897. The float type supernatant liquid discharging device disclosed in these publications is provided with a float valve or an on-off valve in order to prevent sewage from flowing into the supernatant liquid discharging device in the aeration step. However,
In these supernatant discharge devices, if the float valve or the on-off valve malfunctions, it is impossible to prevent sewage from flowing out of the supernatant discharge device in the aeration process. .

Further, when these supernatant liquid discharging devices are modified so as to be positioned above the liquid surface in the aeration process, the supernatant liquid discharging device is lowered before the start of the process of collecting and discharging the supernatant liquid. When this is done, floating substances such as scum attached to the bottom of the supernatant liquid discharging device and floating substances floating on the water surface when the supernatant liquid discharging device descends and lands on the liquid surface
There is a problem that when the drainage is started, it mixes with the supernatant.

It is known from Japanese Utility Model Application Laid-Open No. 1-73304 that an inclination is provided at the bottom of the water collecting container. A water collecting port is provided on the side wall of the water collecting container disclosed in this publication. Therefore, when such a water collection container is modified so as to be positioned above the liquid surface in the aeration process, when the water collection container is lowered before the process of collecting and discharging the supernatant liquid,
Suspended substances such as scum enter the inside of the water collecting container through the water collecting port of the water collecting container, and when the water collecting / draining is started, the floating substance is mixed into the supernatant.

Therefore, the object of the present invention is to disperse water on the liquid surface even if the liquid is positioned above the liquid surface in the aeration process and lowered to the liquid surface before the start of the process of collecting and discharging water. It is an object of the present invention to provide a supernatant discharge device and an openable water collector that are unnecessary and can reliably prevent the discharge of suspended solids to the outside of the system.

[0013]

The opening / closing type water collecting device of the present invention for achieving the above object is an opening / closing type water collecting device for collecting / discharging the supernatant liquid in a drainage treatment tank. This openable water collector comprises a water collector and drainage means arranged inside the water collector, and the water collector has a wedge-shaped bottom surface protruding downward or curved downward. It is characterized in that it has an open bottom surface, and is provided with a supernatant liquid inflow portion that can be opened and closed approximately at the bottom of the bottom surface.

In the open / close type water collecting apparatus of the present invention, the water collector is composed of two box-shaped members each having a substantially box shape, and two box-shaped members are provided above the two side walls of each box-shaped member facing each other. The members are rotatably connected to each other, and the lowermost part of the bottom surface of the two box-shaped members constitutes a supernatant liquid inflow portion, and the lowermost part of the bottom surface of one box-shaped member is It engages with the bottom of the bottom surface, whereby the supernatant liquid inflow part is closed, and by the mutual rotation of the two box-shaped members, the bottom parts of the bottoms of the two box-shaped members are separated from each other, Accordingly, it is preferable that the water collector has a structure in which the supernatant liquid inflow portion is opened. In the water collector of such an aspect, the bottom surface serves as a so-called mog weir and a supernatant liquid inflow portion.

In this case, the float can be arranged on at least one of the box-shaped members, and the buoyancy of the float can cause the two box-shaped members to rotate relative to each other. Alternatively, it is possible to further include a rotating means, and the rotating means can cause the two box-shaped members to mutually rotate.

In the open / close type water collecting apparatus of the present invention, the drainage means is composed of a drain pipe having a water collecting port in the upper portion, and the drain means further comprises a discharge pipe attached to the lower portion of the drain pipe and communicating with the drain pipe. Preferably. Alternatively, the drainage means may be composed of a suction pipe connected to a drainage pump or a submersible pump, or a siphon.

The supernatant liquid discharging device of the present invention for achieving the above object is a supernatant liquid discharging device for collecting and discharging the supernatant liquid in a drainage treatment tank, and is a switchable water collecting device. , A moving means capable of moving the open / close type water collecting device up and down. The openable water collector is composed of a water collector and drainage means arranged inside the water collector. The water collector has a wedge-shaped bottom surface protruding downward or a bottom surface curved downward, and is provided with a supernatant liquid inflow portion that can be opened and closed at substantially the bottom of the bottom surface. The moving means moves the water collector up and down between a rising position above the liquid surface of the drainage treatment tank and a position where the bottom surface of the water collector is submerged in the liquid of the drainage treatment tank, and The water collector can be moved so that it follows the descent of

In the supernatant liquid discharging device of the present invention, the water collector is composed of two box-shaped members each having a substantially box shape, and two box-shaped members are provided above the two side walls of each box-shaped member facing each other. The members are rotatably connected to each other, and the lowermost part of the bottom surface of the two box-shaped members constitutes a supernatant liquid inflow portion, and the lowermost part of the bottom surface of one box-shaped member is It engages with the bottom of the bottom surface, whereby the supernatant liquid inflow part is closed, and by the mutual rotation of the two box-shaped members, the bottom parts of the bottoms of the two box-shaped members are separated from each other, Accordingly, it is preferable that the water collector has a structure in which the supernatant liquid inflow portion is opened.

In this case, the float can be disposed on at least one of the box-shaped members, and the buoyancy of the float can cause the two box-shaped members to rotate relative to each other. Alternatively, it is possible to further include a rotating means, and the rotating means can cause the two box-shaped members to mutually rotate.

In the supernatant liquid discharging device of the present invention, the drainage means comprises a drainage pipe having a water collecting port at an upper portion thereof, and the drainage means further comprises a discharge pipe attached to a lower portion of the drainage pipe and communicating with the drainage pipe. Preferably. Furthermore,
The moving means includes a power source, a first arm member, and a second arm member, one end of the first arm member is rotatably attached to the power source, and the other end is the second arm member. One end of the second arm member is rotatably attached, and the other end of the second arm member is rotatably attached to a connecting portion above two opposing side walls of each box-shaped member. It is preferable that the second arm member is rotatably attached to the other end. Further, it is desirable that the discharge pipe is rotatably attached to the drainage treatment tank.

Alternatively, the drainage means may be composed of a suction pipe connected to a drainage pump or a submersible pump, or a siphon.

[0022]

In the present invention, the water collector has a wedge-shaped bottom surface protruding downward or a bottom surface curved downward, and is provided with a supernatant liquid inflow portion that can be opened and closed at the bottom of the bottom surface. There is. Therefore, when the water collector is lowered from the elevated position above the liquid level and the water collector begins to come into contact with the liquid surface, suspended matter such as scum rises along the bottom surface of the water collector. At this time, if the supernatant liquid inflow part is closed, it is possible to prevent the floating substances from flowing into the water collector, and also to prevent the floating substances from adhering to the bottom surface near the supernatant liquid inflow part. can do. When the water collector is further lowered to a predetermined depth and the supernatant liquid inflow portion is opened, the supernatant liquid flows into the water collector. At this time, since the floating material is not attached to the bottom surface in the vicinity of the supernatant liquid inflow portion, it is possible to reliably prevent the floating material from flowing into the water collector. In other words, the bottom of the water collector
It has a function as a moat weir, and also has a function as an opening / closing portion of the supernatant liquid inflow portion depending on the mode of the water collector.

If the water collector is composed of two box-shaped members,
The opening and closing of the supernatant liquid inflow portion can be controlled with a simple structure. By disposing the float on at least one of the two box-shaped members, it is possible to open and close the supernatant liquid inflow portion without providing any special means.

In the supernatant liquid discharging device of the present invention, if the moving means is composed of the power source, the first arm member and the second arm member, the descending speed of the water collector can be easily made constant. It can be held, and the discharge amount of the supernatant can be kept constant.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described based on embodiments with reference to the drawings.

A side view of the opening / closing type water collecting apparatus of the embodiment is shown in FIG. 1 (A), and a plan view thereof is shown in FIG. 1 (B). In addition, in FIG. 1 (A), a part of a float and a drainage means, which will be described later, are shown by dotted lines. This open / close type water collecting device 10 is an open / close type water collecting device that collects / discharges the supernatant liquid in the drainage treatment tank and does not discharge suspended matter. For example, for use in a batch type activated sludge treatment device. Suitable. The openable water collector 10 is composed of a water collector 20 and drainage means 30 arranged inside the water collector. In the embodiment, the water collector 20 has a wedge-shaped bottom surface 21 protruding downward.
D and 22D are provided, and a supernatant liquid inflow portion 23 that can be opened and closed is provided at approximately the bottom of the bottom surface.

More specifically, the water collector 2 in the embodiment
0 is composed of two substantially box-shaped members 21 and 22. Note that FIG. 2 is a diagram in which the two box-shaped members 21 and 22 are disassembled and viewed from obliquely above. The two box-shaped members 21 and 22 are rotatably connected to each other at the upper portions of the two opposite side walls 21A, 21B, 22A and 22B of the box-shaped members 21 and 22. That is, the box-shaped member 21 and the box-shaped member 2
2 is rotatably connected by a connecting member 24A that penetrates through holes 27A and 27B provided in the upper portions of the side wall 21A and the side wall 22A. Further, the box-shaped member 21 and the box-shaped member 22 are rotatably connected by a connecting member 24B penetrating through holes 28A, 28B provided in the upper portions of the side wall 21B and the side wall 22B.

The bottom surfaces 21D of the two box-shaped members 21 and 22,
The supernatant liquid inflow portion 23 is formed by substantially the lowermost portion of 22D. Then, the lowermost portion of the bottom surface 22D of the one box-shaped member 22 engages with the lowermost portion of the bottom surface 21D of the other box-shaped member 21, that is, the end surfaces of the respective bottom surfaces 21D and 22D abut against each other, whereby the supernatant liquid The inflow part is closed (see FIG. 1). A slight gap may exist between the lowermost portion of the bottom surface 22D of the box-shaped member 22 and the lowermost portion of the bottom surface 21D of the other box-shaped member 21. Furthermore, for example, the box-shaped member 22
The bottom surface 22D of the box-shaped member 22 may be extended such that a part of the bottom surface 22D of the box-shaped member 21 overlaps the bottom surface 21D of the box-shaped member 21. On the other hand, due to the mutual rotation of the two box-shaped members 21 and 22, the lowermost portions of the bottom surfaces 21D and 22D of the two box-shaped members are separated from each other, whereby the supernatant liquid inflow portion 23 is opened. Become. Each box-shaped member 21, 22 can be made of any material as long as it is a material having corrosion resistance, weather resistance and the like. Examples of the material include stainless steel plates.

Side walls 22C, 22 of the box-shaped members 21, 22
Floats 25 and 26 are arranged in the vicinity of C. Due to the buoyancy of the floats 25 and 26, the two box-shaped members 21,
Mutual rotation of 22 occurs. The center points of this rotation are the connecting members 24A and 24B. The floats 25, 26 can be made from FRP and stainless steel plates, for example.

In the embodiment, the drainage means 30 is composed of a drainage pipe 31 having a water collecting port 32 on the upper portion. In the embodiment, the drain pipe 31 is rotatably attached to the other end of the second arm member 53 that constitutes the moving means 50 described later via the connecting members 24A and 24B. The drainage means 30 further includes a discharge pipe 33 attached to the lower portion of the drainage pipe 31 and communicating with the drainage pipe 31. The discharge pipe 33 is of a natural flow-down type. The supernatant liquid is discharged to the outside of the system through the drainage pipe 31 and the discharge pipe 33 through the water collecting port 32. In addition, in FIG. 2, reference numerals 29A and 29B are cutout portions provided in the bottom surfaces 21D and 22D for passing the discharge pipe 33. The drain pipe 31 and the discharge pipe 33 can be made of, for example, a stainless steel pipe. still,
The discharge pipe 33 may be provided so as to penetrate the side wall 21A and the bottom surface 21D of the water collector.

FIGS. 3 to 5 show the supernatant discharge device of the present invention incorporating the openable water collector described in the embodiment. This supernatant liquid discharging device is arranged in the batch type activated sludge treatment device and is a supernatant liquid discharging device which collects and discharges the supernatant liquid in the drainage treatment tank 40 and does not discharge the suspended matter. . Further, it is composed of the open / close type water collecting device 10 described in the embodiment and the moving means 50. The moving means 50 is the water collector 2
0 is a rising position above the liquid level LL of the drainage treatment tank 40,
It is possible to move up and down between at least the lowermost portions of the bottom surfaces 21D and 22D of the water collector 20 and the position where the bottom surface is submerged below the liquid surface of the drainage treatment tank 40. Further, the liquid surface is lowered as the supernatant liquid is discharged, and the moving means 50 moves the water collector 20 downward so that the water collector 20 follows the lowering of the liquid surface.

The moving means 50 comprises a power source 51, a pair of first arm members 52, and a pair of second arm members 53.
One end of each first arm member 52 is rotatably attached to the power source 51, and the other end is rotatably attached to one end of each second arm member 53 by a pin 55. On the other hand, the other end of each second arm member 53 is connected to each box-shaped member 21, 2.
Two opposing two sidewalls 21A, 21B, 22A, 22
It is rotatably attached to the connecting portion above B.
More specifically, the other end of each second arm member 53 is rotatably attached to the connecting members 24A and 24B. Further, both ends of the drainage pipe 31 constituting the drainage means 30 are also rotatably attached to the connecting members 24A and 24B. The power source 51 is composed of a motor and a gear (not shown), and is attached to the mount 54. The discharge pipe 33 is rotatably attached to the drainage treatment tank 40 by a rotary joint 41.

In the aeration step and the separation step in the batch activated sludge method, the open / close type water collecting apparatus 10 of the present invention is positioned at a predetermined elevated position above the liquid level LL, as shown in FIG. In this state, the lowermost portion of the bottom surface 22D of the one box-shaped member 22 engages with the lowermost portion of the bottom surface 21D of the other box-shaped member 21, whereby the supernatant liquid inflow portion 2
3 is in a closed state.

First, a certain amount of sewage containing pollutants is made to flow into the drainage treatment tank 40 through a pipe (not shown). Next, the sewage is aerated to mix the activated sludge in the drainage treatment tank with the inflow sewage, and air (oxygen) is supplied as fine bubbles to the aeration mixture by an air diffuser (not shown). As a result, the reaction such as the oxidation of the organic substance is performed for a certain period of time. The air diffuser is usually intermittently supplied with air from an aeration blower (not shown). In this case, it is desirable to use a device that is unlikely to be clogged, such as a jet type air diffuser that ejects a gas-liquid mixture. After that, the aeration is stopped, the sludge is allowed to settle, and the supernatant liquid is separated.

After the separation of the supernatant liquid is completed and before the collection and discharge of the supernatant liquid is started, the openable water collector 10 is lowered so that a part of the supernatant liquid is below the liquid level LL. By measuring the position of the liquid surface with a liquid level gauge (not shown), it is possible to know the time when the water collector 20 of the openable water collector 10 starts to contact the liquid surface. The open / close type water collecting device 10 may be lowered by moving the first arm member 52 counterclockwise by the power source 51. The rotation of the first arm member 52 causes the second arm member 5 to rotate.
3 also rotates, and as a result, the open / close type water collecting device 10 descends.

In the embodiment, the water collector 20 has wedge-shaped bottom surfaces 21D and 22D protruding downward, so that floating substances such as scum contacting the bottom surfaces 21D and 22D are bottom surfaces 21D and 22D. Ascend along 22D. Even in this state, the supernatant liquid inflow portion 23 is closed.
Therefore, the suspended matter does not flow into the water collector 20 (see FIG. 4).

After that, the power source 51 is continuously operated to further lower the water collector 20 of the openable water collector 10. It should be noted that slowing down the descending speed of the water collector 20 after the water collector 20 has come into contact with the liquid surface is more effective than the descending speed of the water collector 20 before the water collector 20 is in contact with the liquid surface. It is desirable for surely preventing the inflow of suspended solids into the water container 20 and collecting the supernatant. When a part of the water collector 20 sinks to a predetermined depth,
Due to the buoyancy of the floats 25 and 26, the two box-shaped members 2
The mutual rotation of 1 and 22 occurs with the connecting members 24A and 24B as the rotation axes. As a result, the bottom surfaces 21 of the two box-shaped members are
The lowermost portions of D and 22D are separated from each other, whereby the supernatant liquid inflow portion 23 is opened (see FIG. 5).
Even in this state, since the bottom surfaces 21D and 22D are wedge-shaped and project downward, floating substances such as scum contacting the bottom surfaces 21D and 22D rise along the bottom surfaces 21D and 22D. Therefore, the suspended matter does not flow into the water collector 20. That is, the bottom surfaces 21D and 22D function as a hollow weir. The supernatant liquid inflow portion 23 is provided inside the water collector 20.
The supernatant liquid flows in through the drainage pipe 3 through the water collecting port 32.
1. The supernatant liquid begins to be discharged out of the system through the discharge pipe 33.

The liquid level LL is lowered by discharging the supernatant liquid. The power source 51 is controlled so that the lowering of the water collector 20 follows this lowering of the liquid level. As a result, the positional relationship of the water collector 20 with respect to the liquid surface is maintained substantially constant. Thus, the drain pipe 3 is provided through the supernatant liquid inflow portion 23 and the water collecting port 32.
1. The supernatant is continuously discharged to the outside of the system through the discharge pipe 33.

When the liquid level is measured by the liquid level gauge, the operation of the power source 51 is stopped. As a result, the discharge of the supernatant liquid from the system is stopped. Then, the power source 51 is reversed and the water collector 20 is again located at a predetermined rising position. Along with this, the mutual rotation of the two box-shaped members 21 and 22 occurs with the connecting members 24A and 24B as the rotation axes, and the lowermost portions of the bottom surfaces 21D and 22D of the two box-shaped members are closed. Thus, the supernatant liquid inflow portion 23 is closed. A water spraying device (not shown) may be provided to spray the bottom surfaces 21D and 22D of the water collector 10 with water for cleaning. Then, if necessary, the sludge accumulated on the bottom of the drainage treatment tank is extracted to the outside by a pipe and an extraction pump (not shown).

With the above, one of a series of processing cycles is completed. Thereafter, each of these steps is repeated as a series of processing cycles.

In the open / close type water collecting device 10 of the embodiment,
Since the opening and closing of the supernatant liquid inflow portion 23 is performed by the buoyancy of the floats 25 and 26, the opening and closing of the opening and closing type water collecting device 10 is very simple, but the opening and closing of the supernatant liquid inflow portion 23 is surely performed. In addition, it is possible to reliably prevent floating substances such as scum from flowing out of the system.

Although the present invention has been described based on the preferred embodiment, the present invention is not limited to this embodiment. The structures and materials described in the embodiments are examples, and the design can be appropriately changed. For example, one box-shaped member 2
The float may be provided only on the second side. Even with such a configuration, the buoyancy of the float causes mutual rotation of the two box-shaped members. In this case, the drainage pipe 31 may be attached to the other box-shaped member 21 or the discharge pipe 33 may be attached to the other box-shaped member 21.

Alternatively, the structure of the two box-shaped members constituting the water collector can be changed to a structure in which a sphere is cut into quarters. Alternatively, it may be a structure in which a cylinder, an elliptic cylinder, or a polygonal cylinder is appropriately cut along the axis. When these structures are adopted, the water collector has a bottom surface curved downward. FIG. 6 shows an exploded view of the two box-shaped members 21 and 22 having a structure in which they are cylindrically cut along the axis and seen obliquely from above.

In the embodiment, each box-shaped member is provided with a float, and the buoyancy of these floats causes the two box-shaped members to rotate relative to each other. Instead, however, a hydraulic cylinder or an air cylinder is used. Alternatively, it is also possible to dispose a rotating means combining a motor and a gear on the upper part of the water collector so that the two box-shaped members can be rotated relative to each other. The discharge pipe 33 in the drainage means 30 described in the embodiment may be replaced with a flexible hose.

For example, a structure in which a water collector having a hemispherical shape or a semi-cylindrical shape is used, an opening is provided at the bottom of the water collector having such a structure, and an opening / closing valve engaging with this opening is attached to the water collector. You can also do it. It is preferable that the outer surface of the on-off valve and the bottom of the water collector form a smooth curved surface.
In such a form, valve collectors such as a hydraulic cylinder and an air cylinder may be attached to the water collector, and the valve selectors may control the opening and closing of the valve. Alternatively, a shutter mechanism may be provided instead of the open / close valve.

The drainage means described in the embodiments may be replaced with a suction pipe connected to a drainage pump, or may be replaced with a submersible pump. In this case,
For example, it can be replaced with a lifting device composed of a wire, a chain and a motor attached to the mounting base 54, a hydraulic cylinder, an air cylinder, or a combination of a rack and a pinion and a motor.

Furthermore, the drainage means described in the embodiment can be replaced with a siphon. In this case, the drainage means is composed of an inverted U-shaped pipe, and an exhaust pump or an exhaust blower is arranged at one end of the drainage means. An exhaust valve is attached to the top of the inverted U-shaped pipe. And
At the time of drainage, the inside of the drainage means is exhausted by an exhaust pump or an exhaust blower. As a result, a siphon phenomenon occurs, and the supernatant liquid is discharged from the drainage means to the outside of the system. Open the exhaust valve to stop draining. As a result, the siphon phenomenon disappears and drainage is stopped.

The open / close type water collecting device and the supernatant liquid discharging device of the present invention can be widely used not only for the batch type activated sludge treatment device but also for the purpose of extracting the supernatant liquid from various water tanks.

[0049]

According to the present invention, it is not necessary to spray water on the liquid surface even if it is positioned above the liquid surface in the aeration process and lowered to the liquid surface before the start of the process of collecting and discharging water. In spite of the simple structure of the open / close type water collecting device, it is possible to discharge only the supernatant liquid and reliably prevent the suspended matter from flowing into the water collecting device. Also, 2 water collectors
If the box-shaped member is used, the opening and closing of the supernatant liquid inflow portion can be controlled with a simple structure. By disposing the float in at least one of the box-shaped members, the supernatant liquid inflow portion can be opened and closed without providing any special means. Further, in the supernatant liquid discharging device of the present invention, if the moving means is composed of the power source, the first arm member and the second arm member, the descending speed of the water collector can be easily maintained at a constant value. It is possible to keep the discharge amount of the supernatant liquid constant.

[Brief description of drawings]

FIG. 1 is a side view and a plan view of an opening / closing type water collecting apparatus according to an embodiment.

FIG. 2 is an exploded perspective view of two box-shaped members.

FIG. 3 is a diagram showing an outline of a supernatant liquid discharging device incorporating the opening / closing type water collecting device described in the embodiment, and is a diagram showing a state in which the opening / closing type water collecting device is in a raised position.

FIG. 4 is a diagram showing a state in which a part of the openable water collector is slightly submerged from the liquid surface, but the supernatant liquid inflow portion is closed.

FIG. 5 is a diagram showing a state in which a part of the openable water collector is submerged from the liquid surface and the supernatant liquid inflow portion is opened.

FIG. 6 is an exploded perspective view of two box-shaped members having a shape different from the shapes shown in FIGS. 1 and 2.

[Explanation of symbols]

10 Opening / closing type water collecting device 20 Water collecting device 21, 22 Box-shaped member 21A, 21B, 22A, 22B, 21C, 22C Side wall of water collecting device 21D, 22D Bottom face of water collecting device 23 Supernatant liquid inflow part 24A, 24B Connection Member 25, 26 Float 30 Drainage means 31 Drain pipe 32 Water collection port 33 Discharge pipe 40 Drainage treatment tank 41 Rotating joint 50 Moving means 51 Power source 52 First arm member 53 Second arm member 54 Mounting base

Claims (16)

[Claims] 1. An open / close type water collecting device for collecting / discharging the supernatant liquid in a drainage treatment tank, wherein the open / close type water collecting device is a water collecting device and an inside of the water collecting device. The drainage means is disposed in the water collector, and the water collector has a wedge-shaped bottom surface protruding downward or a bottom surface curved downward, and a supernatant liquid inflow portion that can be opened and closed at substantially the bottom of the bottom surface. An openable water collection device characterized by being equipped with. 2. A water collector is composed of two box-shaped members each having a substantially box shape, and the two box-shaped members are rotatably connected to each other at the upper portions of two opposing side walls of each box-shaped member. The bottom of the bottom of the two box-shaped members constitutes the supernatant inflow part, the bottom of the bottom of one of the box-shaped members engages with the bottom of the bottom of the other box-shaped member, As a result, the supernatant liquid inflow portion is closed, and the lowermost parts of the bottom surfaces of the two box-shaped members are separated from each other by the mutual rotation of the two box-shaped members, whereby the supernatant liquid inflow portion is opened. The open / close type water collecting device according to claim 1, which is in a state. 3. The opening / closing according to claim 2, wherein at least one of the box-shaped members is provided with a float, and the buoyancy of the float causes mutual rotation of the two box-shaped members. Water collection device. 4. The open / close type water collecting device according to claim 2, further comprising rotating means for causing the two box-shaped members to mutually rotate. 5. The drainage means is composed of a drainage pipe having a water collecting port at an upper portion thereof, and the drainage means further comprises a discharge pipe attached to a lower portion of the drainage pipe and communicating with the drainage pipe. The opening-and-closing type water collection device according to any one of claims 2 to 4. 6. The drainage means comprises a suction pipe or a submersible pump connected to a drainage pump.
The opening-and-closing type water collecting device according to any one of claims 4 to 5. 7. The open / close type water collecting device according to claim 1, wherein the drainage means is a siphon. 8. A supernatant liquid discharging device for collecting and discharging the supernatant liquid in a drainage treatment tank, the opening and closing type water collecting device, and a movement capable of moving the opening and closing type water collecting device up and down. The opening / closing type water collecting device is composed of a water collecting device and a draining device arranged inside the water collecting device, and the water collecting device is a wedge-shaped bottom surface protruding downward or It has a bottom surface that curves downward, and a supernatant liquid inflow portion that is openable and closable is provided at approximately the bottom of the bottom surface, and the moving means is configured to move the water collector above the liquid surface of the drainage treatment tank. Move up and down between a rising position and a position where the bottom surface of the water collector is submerged in the liquid in the drainage treatment tank, and move the water collector so that the water collector follows the lowering of the liquid surface. A supernatant discharge device characterized by being obtained. 9. A water collector is composed of two box-shaped members each having a substantially box shape, and the two box-shaped members are rotatably connected to each other at the upper portions of two opposing side walls of each box-shaped member. The bottom of the bottom of the two box-shaped members constitutes the supernatant inflow part, the bottom of the bottom of one of the box-shaped members engages with the bottom of the bottom of the other box-shaped member, As a result, the supernatant liquid inflow portion is closed, and the lowermost parts of the bottom surfaces of the two box-shaped members are separated from each other by the mutual rotation of the two box-shaped members, whereby the supernatant liquid inflow portion is opened. The supernatant liquid discharging device according to claim 8, which is in a state. 10. A float is disposed on at least one of the box-shaped members, and the buoyancy of the float causes mutual rotation of the two box-shaped members.
The supernatant discharge device according to [4]. 11. The supernatant liquid discharging device according to claim 9, further comprising rotating means for causing the two box-shaped members to mutually rotate. 12. The drainage means comprises a drainage pipe having a water collecting port on an upper portion thereof, and the drainage means further comprises a discharge pipe attached to a lower portion of the drainage pipe and communicating with the drainage pipe. The supernatant discharge device according to any one of claims 9 to 11. 13. The moving means comprises a power source, a first arm member and a second arm member, one end of the first arm member being rotatably attached to the power source and the other end. Is rotatably attached to one end of a second arm member, and the other end of the second arm member is rotatably attached to a connecting portion above two opposing side walls of each box-shaped member. And the drainage pipe is second
The supernatant liquid discharging device according to claim 12, wherein the supernatant liquid discharging device is attached to the other end of the arm member. 14. The supernatant discharge device according to claim 12, wherein the discharge pipe is rotatably attached to the waste liquid treatment tank. 15. The supernatant liquid discharging device according to claim 8, wherein the drainage means comprises a suction pipe connected to a drainage pump or a submersible pump. 16. The supernatant liquid discharging device according to claim 8, wherein the draining means is a siphon.