JP7404957B2 - Wastewater treatment system and wastewater treatment method - Google Patents

Description

The present invention relates to a wastewater treatment system and a wastewater treatment method.

In order to obtain a drainage system that is easy to clean and has excellent durability, it is equipped with a moving means and is movable on the floor below the sink tank drain port, and is designed to remove contaminants from the wastewater introduced from the inlet. a blocker that separates and processes substances with a blockage means and discharges treated water from a discharge port; a device drain pipe that guides wastewater discharged from the tank drain port to the inlet port; and at least a portion of the drain pipe is flexible. and a transfer pipe for transferring the treated water from the discharge port to the floor drain port, wherein the blocker has the introduction port in the ceiling surface and one end is connected to the tank drain port. Patent Document 1 describes a drainage system characterized in that the other end opening of the appliance drainage pipe is disposed above the inlet.

JP2008-63731A

When preparing a sample to be observed with a transmission electron microscope (TEM) or a scanning electron microscope (SEM), a large amount of polishing powder and polishing debris is generated. Hereinafter, for convenience of explanation, it will be referred to as polishing powder.

When the sample is washed in a normal think tank (sink), washing waste water containing a large amount of polishing powder flows out. Hereinafter, for convenience of explanation, the cleaning waste water will be simply referred to as waste water.

The material of the polishing powder generated when handling the sample is metal, oxide, resin (for example, epoxy resin, phenol resin), etc. These substances are relatively easy to settle and accumulate. Therefore, the waste water is collected in a water collection basin (a first storage tank in this embodiment described later), and the polishing powder is allowed to settle at the bottom of the water collection basin. In this state, the supernatant waste water overflowing from the water collection basin is allowed to flow into another water collection basin (a second storage tank in this embodiment described later).

On the other hand, the inventor's investigation revealed the following.
It has become clear that some polishing powder floats on the water surface and is difficult to settle. Then, while the supernatant wastewater is flowing into another catchment, drops of the supernatant wastewater fall between the catchment, and the abrasive powder contained in the drops is absorbed into the surrounding environment of the wastewater treatment system (i.e., where the catchment is placed). It has become clear that the area around the floor where the product was placed can be contaminated. Furthermore, the abrasive powder, which is difficult to settle, would accumulate in the drainage channels between the water collection basins.

As a countermeasure to this problem, it may be possible to install another wastewater treatment system around the wastewater treatment system, but in that case, the grooves and piping of the other wastewater treatment system There is also a risk of clogging due to polishing powder and debris inside.

An object of the present invention is to provide a method that prevents the surrounding environment of a wastewater treatment system from being contaminated by polishing powder.

The first aspect of the present invention is
a first storage tank that receives wastewater;
a second storage tank that receives supernatant wastewater flowing from a gutter provided in the first storage tank;
has
In the wastewater treatment system, the gutter is provided with a drainage member that prevents liquid from dripping down the gutter, and an extension member that extends the flow path of the supernatant wastewater is added.

A second aspect of the present invention is the invention described in the first aspect,
The second storage tank is
a supernatant wastewater storage chamber that receives supernatant wastewater flowing from a gutter provided in the first storage tank;
a water level measurement chamber for receiving supernatant wastewater overflowing from the supernatant wastewater storage chamber;
Equipped with
In the water level measurement room,
A water level measuring member,
a liquid sending member that extracts supernatant wastewater from the water level measuring chamber according to the measurement result of the water level measuring member;
will be installed.

A third aspect of the present invention is the invention described in the first or second aspect,
The draining member is a flexible member extending downward from the back surface of the bottom surface of the gutter.

A fourth aspect of the present invention is the invention according to any one of the first to third aspects,
The stretching member is made of at least one of resin and cloth.

A fifth aspect of the present invention is the invention according to any one of the first to fourth aspects,
The gutter is a square gutter.

A sixth aspect of the present invention is the invention according to any one of the first to fifth aspects,
A liquid splash prevention member is provided from the opening of the drain pipe that introduces waste water from above the first storage tank to at least the level of the liquid level of the first storage tank from which the supernatant waste water is discharged. Drain openings are covered.

The seventh aspect of the present invention is
a first storage tank that receives wastewater;
a second storage tank that receives supernatant wastewater flowing from a gutter provided in the first storage tank;
has
The gutter is provided with a draining member that prevents liquid from dripping through the gutter, and an extending member that extends the flow path of the supernatant drainage,
The second storage tank is
a supernatant wastewater storage chamber that receives supernatant wastewater flowing from a gutter provided in the first storage tank;
a water level measurement chamber for receiving supernatant wastewater overflowing from the supernatant wastewater storage chamber;
Equipped with
In the water level measurement room,
A water level measuring member,
a liquid sending member that extracts supernatant wastewater from the water level measuring chamber according to the measurement result of the water level measuring member;
is installed,
The draining member is a flexible member extending downward from the back surface of the bottom surface of the gutter,
The stretching member is made of at least one of resin and cloth,
The gutter is a square gutter,
A liquid splash prevention member is provided from the opening of the drain pipe that introduces waste water from above the first storage tank to at least the level of the liquid level of the first storage tank from which the supernatant waste water is discharged. This is a wastewater treatment system in which the drain pipe openings are covered.

The eighth aspect of the present invention is
A wastewater treatment method using the wastewater treatment system according to any one of the first to seventh aspects,
In the wastewater treatment method, polishing powder contained in the wastewater received by the first storage tank and contained in the supernatant wastewater flowing through the gutter is collected by the elongated member.

According to the present invention, it is possible to provide a method for preventing the surrounding environment of a wastewater treatment system from being contaminated by polishing powder.

FIG. 1 is a schematic side sectional view of a wastewater treatment system according to this embodiment. FIG. 2 is a schematic perspective view of the first storage tank according to the present embodiment.

FIG. 1 is a schematic side sectional view of a wastewater treatment system according to this embodiment.
FIG. 2 is a schematic perspective view of the first storage tank according to the present embodiment.

Embodiments of the present invention will be described below. This embodiment has the following configuration.
“The first storage tank 2 receives wastewater,
a second storage tank 6 that receives supernatant wastewater flowing from a gutter 3 provided in the first storage tank 2;
has
A wastewater treatment system 1, in which the gutter 3 is provided with a draining member 4 for preventing liquid dripping through the gutter 3, and an extending member 5 for extending a flow path of supernatant wastewater. ”

The first storage tank 2 is a container for receiving waste water, and is not limited in shape or material as long as it is provided with a gutter 3 for discharging supernatant waste water. The wastewater treatment system 1 of this embodiment is not limited to the type of wastewater, but cleaning wastewater from the production of TEM samples and SEM samples, which led to the creation of the present invention, may contain metals and oxides. Since a large amount of polishing powder derived from resin (for example, epoxy resin, phenol resin) is contained, the effects of the present invention are remarkable.

The gutter 3 provided in the first storage tank 2 is a part that allows a supernatant portion (supernatant waste water) of the waste water collected in the first storage tank 2 to flow into the adjacent second storage tank 6. Therefore, the gutter 3 is preferably provided above the side surface of the first storage tank 2. There are no limitations on the material, shape, or number of the gutter 3 itself. When a plurality of gutters 3 are provided, a plurality of second storage tanks 6, which will be described later, are also provided.

The shape of the gutter 3 may be a cylinder (pipe) or a semi-cylinder (groove). However, if the gutter 3 is a square gutter, when draining the supernatant water into the second storage tank 6, the height from the water surface of the second storage tank 6 can be made approximately equal in the width direction of the gutter 3, compared to a circular gutter. , it becomes possible to stably flow the supernatant wastewater, and ripples in the second storage tank 6 can be minimized. This is preferable because sedimentation and separation in the second storage tank 6 can be maintained well, and droplets that can contaminate the surrounding environment are less likely to be produced.

A specific example of the dimensions of the first storage tank 2 is as follows.
The first storage tank 2 is a PVC tank with dimensions of 450 mm in depth x 450 mm in width x 320 mm in height, and a portion of the upper side of the first storage tank 2 is cut out to have a size of 50 mm in length x 200 mm in width. × A square gutter made of PVC with a height of 50 mm is provided.

This embodiment is characterized in that the gutter 3 is provided with the following two members.
・Draining member 4 that prevents liquid from dripping down the gutter 3
・Extension member 5 that extends the flow path of supernatant drainage

There are no limitations on the material, shape, and number of the draining member 4 as long as it can prevent liquid dripping through the gutter 3.

Although there are no limitations on the arrangement of the draining member 4, it is preferable to provide the draining member 4 at the end of the gutter 3 in order to cause drips to fall as close to the end of the gutter 3 as possible. In addition, in this specification, the first storage tank 2 side is defined as the base end. That is, the end of the gutter 3 is the part of the gutter 3 located directly above the second storage tank 6.

Regarding the material of the draining member 4, it is preferable that the draining member 4 is a flexible member extending downward from the back surface near the end of the gutter 3. When performing maintenance and inspection on the first storage tank 2 or draining and cleaning the first storage tank 2 (hereinafter referred to as maintenance and inspection, etc.), it is necessary to remove the first storage tank 2 from the wastewater treatment system 1. When pulling out the first storage tank 2 in the horizontal direction, if the draining member 4 is a non-flexible member, the draining member 4 and the side wall of the second storage tank 6 will interfere, causing the draining member 4 to come off. The gutter 3 provided with the draining member 4 and, in turn, the first storage tank 2 must be lifted and pulled out. On the other hand, if the draining member 4 is a flexible member, it becomes possible to remove the first storage tank 2 from the wastewater treatment system 1 while deforming the draining member 4, that is, the draining member 4 and the second storage tank It becomes possible to remove the first storage tank 2 without worrying about collision with the first storage tank 6, and maintenance and inspection work becomes easier.

Although there is no limitation on the specific material of the flexible member, examples include resin film, cloth, and gummed tape. These materials can be attached to and removed from the wastewater treatment system 1, and the work can be completed by simply removing them and attaching new resin films during maintenance and inspection, making maintenance and inspection easier. You can aim for

There are no limitations on the shape or number of the draining members 4, and a plurality of draining members 4 may be hung from the end of the gutter 3 in a so-called goodwill shape, or one draining member 4 may be hung from the end of the gutter 3. This can prevent supernatant wastewater from flowing down the gutter 3 and dripping between the first storage tank 2 and the second storage tank 6.

The stretching member 5 is also a guide member that guides the flow path of the supernatant drainage to be stretched. As long as the flow path for supernatant drainage can be extended, there are no limitations on the material, shape, or number. By extending the flow path of the supernatant wastewater, the supernatant wastewater can be dropped at an optimal position when the second storage tank 6 is viewed from above. This reduces the possibility that drops will fall between the first reservoir 2 and the second reservoir 6.

Regarding the material of the stretching member 5, it is preferable that it is made of at least one of resin and cloth. These materials can be attached to and removed from the wastewater treatment system 1, and the work can be completed by simply removing them and attaching new resin films during maintenance and inspection, making maintenance and inspection easier. You can aim for

Regarding another reason why at least one of resin and cloth is preferable, when the waste water is cleaning waste water during the preparation of TEM samples or SEM samples, the supernatant waste water also contains polishing powder. This is as described in the problem of the present invention.

Most of the polishing powder contained in the supernatant waste water has a small particle size, for example, most of the particles are fine particles with a particle size of 500 μm or less. This refers to a state in which the particle size D50 of the polishing powder in the supernatant wastewater in the second storage tank 6 is 500 μm or less as measured by a laser diffraction scattering particle size distribution measuring device.

The inventor has confirmed that these fine particles can be collected if the stretching member 5 is made of resin. Further, it is preferable that the stretching member 5 is made of cloth because these fine particles can be collected in the mesh of the cloth. In view of this point, woven fabrics are more suitable than non-woven fabrics. However, in the case of cloth, there is a possibility that the rigidity is insufficient, and in that case, the stretching member 5 may be a plate-shaped resin film wrapped around the cloth.

As mentioned above, polishing powder is a mixture of metals, oxides, resins (eg, epoxy resins, phenolic resins), and the like. Of these, most of the metals and oxides with high specific gravity settle in the first storage tank 2. The polishing powder contained in the supernatant wastewater flowing through the gutter is mainly resin with a low specific gravity. It is presumed that the above phenomenon is due to the fact that resin powder with a small particle size has a characteristic of easily adhering to resin films and cloth.

Therefore, members that collect these fine particles are also collectively referred to as a collection member. That is, it is preferable that the stretching member 5 is a collection member. In this respect as well, it is preferable that the shape of the gutter 3 is a rectangular gutter. Compared to a circular gutter, in the case of a rectangular gutter, the supernatant wastewater spreads out in the width direction of the gutter 3 and flows, and in this state, a large amount of the supernatant wastewater passes over the extending member 5 and the collection member. As a result, in the case of a rectangular gutter, more particles in the supernatant waste water can be collected by the stretching member 5 and the collecting member than in a circular gutter.

Note that a polishing powder collecting member may be provided on the bottom surface of the gutter 3, which serves as a flow path for supernatant drainage. For example, at least one of a resin film, cloth, and gummed tape may be provided on the bottom surface. When using gummed tape, the draining member 4 and the collection member may be formed integrally. That is, a piece of gummed tape may be provided hanging from the bottom of the gutter 3 below the end of the gutter 3.

These materials can be attached to and removed from the wastewater treatment system 1, and the work can be completed by simply removing them and attaching new resin films during maintenance and inspection, making maintenance and inspection easier. You can aim for

Further, these materials are easy to process, and it is possible to easily manufacture the stretched member 5 having a stretching distance that matches the size of the second storage tank 6, that is, the optimal position of the second storage tank 6. For example, in the case of a resin film, it is sufficient to simply cut the film according to the stretching distance.

Moreover, the extending member 5 is not attached directly to the end portion of the gutter 3, but from the proximal side of the bottom surface of the gutter 3, that is, the communication portion between the inside of the first storage tank 2 and the gutter 3, to the end portion of the bottom surface of the gutter 3. It may be provided up to the extension part.

In addition, when the stretched member 5 is a resin film, the draining member 4 is attached to the end of the gutter 3 while attaching the collection member (gum tape) to the bottom of the gutter 3, also to fix the resin film. It may be formed with packing tape toward the bottom, and a resin film may be further fixed with packing tape. There is no limit to the distance that extends downward, and one example is 10 mm. In addition, it is preferable that the draining member 4 is also the above-mentioned collecting member.

There is no limit to the number of stretching members 5, but if there are a plurality of stretching members 5, there is a possibility that supernatant wastewater may leak from gaps between the stretching members 5, so one is preferable.

The extending member 5 in this embodiment is added to the gutter 3 provided in the first storage tank 2. In other words, the present embodiment can be applied even to the existing first storage tank 2 with the gutter 3, and the present embodiment is highly versatile. This also applies to the draining member 4.

The second storage tank 6 is not limited in shape, material, and number as long as it is a container that receives the supernatant waste water flowing from the gutter 3 provided in the first storage tank 2. A preferred configuration is as follows.
“The second storage tank 6 is
a supernatant wastewater storage chamber 7 that receives supernatant wastewater flowing from a gutter 3 provided in the first storage tank 2;
a water level measuring chamber 8 for receiving supernatant wastewater overflowing from the supernatant wastewater storage chamber 7;
Equipped with
In the water level measurement chamber 8,
A water level measuring member (not shown),
a liquid sending member (not shown) that extracts supernatant wastewater from the water level measuring chamber 8 according to the measurement result of the water level measuring member;
will be installed. ”

The supernatant drainage storage chamber 7 is not limited as long as it receives the supernatant drainage flowing from the gutter 3 provided in the first storage tank 2, and a threshold is provided at the bottom of the second storage tank 6 to divide it into a plurality of areas. One of the areas may be used as the supernatant wastewater storage chamber 7. When the supernatant wastewater accumulates in the supernatant wastewater storage chamber 7 to a level higher than the height of this sill, the supernatant wastewater crosses the threshold and flows into the water level measurement chamber 8 which is an adjacent area.

The water level measuring chamber 8 is not limited as long as it is a part that receives the supernatant wastewater overflowing from the supernatant wastewater storage chamber 7. However, it is preferable that the water level measuring chamber 8 is provided with a water level measuring member and a liquid sending member for extracting the supernatant wastewater from the water level measuring chamber 8 according to the measurement result of the water level measuring member.

As the name suggests, the water level measuring member is an instrument for measuring the water level, and a known water level gauge may be used.

The liquid feeding member is not limited as long as it extracts the supernatant waste water from the water level measuring chamber 8 according to the measurement result of the water level measuring member, and a known pump may be used. As a specific function, when the water level gauge detects a water level above a predetermined level, a pump serving as a liquid feeding member is activated, and the supernatant waste water in the water level measurement chamber 8 is extracted until the water level falls below a predetermined level.

The liquid splash prevention member 10 extends from the opening of the drain pipe 9 that introduces waste water from above the first storage tank 2 to at least the level of the liquid level of the first storage tank from which the supernatant waste water is discharged. It is preferable to cover the opening of the drain pipe 9 with the drain pipe 9.

While the wastewater treatment system 1 according to this embodiment is operating, the water surface of the first storage tank 2 is at approximately the same height as the bottom surface of the gutter 3 through which the supernatant wastewater flows. Therefore, if the area from the opening of the drain pipe 9 to the bottom of the flow path of the gutter 3, which is the height of the part where the first storage tank 2 and the gutter 3 connect, is covered, the liquid will not be splashed from the first storage tank. Splashing outside the tank 2 can be prevented. Since the above-mentioned effects can be obtained by providing the liquid splash prevention member 10 to the existing drain pipe 9, this configuration has high versatility. In addition, the liquid splash prevention member 10 may be arranged in the gutter 3 to have a length that exceeds the bottom surface through which the supernatant waste water flows, that is, a length that allows the tip of the liquid splash prevention member to be buried under the water surface.

There is no limit to the number of liquid splash prevention members 10. The number may be set according to the number of openings of the drain pipe 9 that exists directly above the first storage tank 2. There is no limitation on the material, and for example, a bag made of resin may be used, or flexible piping may be provided. There is no limitation to the shape, and it may be a straight pipe or a curved pipe to reduce the force of the drainage water falling into the first storage tank 2.

A plurality of wheels may be provided on the bottom of the first storage tank 2. By rolling the wheels on the floor, if the liquid splash prevention member 10 is a flexible member, the first storage tank 2 can be easily pulled out from the wastewater treatment system 1, improving work efficiency such as maintenance and inspection. improves. This wheel may also be provided in the second storage tank 6. When the draining member 4 is a flexible member, the draining member 4 can be detached from the wastewater treatment system 1 by simply pulling out the second storage tank 6 while deforming the draining member 4.

Note that the technical scope of the present invention is not limited to the embodiments described above, and various changes and improvements may be made within the scope of deriving specific effects obtained by the constituent elements of the invention and their combinations. include.

1... Wastewater treatment system 2... First storage tank 3... Gutter 4... Draining member 5... Extension member 6... Second storage tank 7... Supernatant wastewater storage chamber 8... Water level measurement chamber 9... Drain pipe 10...Liquid splash prevention member

Claims (7)

a first storage tank that receives wastewater;
a second storage tank that receives supernatant wastewater flowing from a gutter provided in the first storage tank;
has
The gutter is provided with a drainage member that prevents liquid from dripping through the gutter, and an extension member that extends the flow path of the supernatant drainage is added ,
The gutter is a square gutter,
The draining member is a flexible member extending downward from the back surface of the bottom surface of the gutter across the width direction of the gutter,
The elongated member is installed on the bottom surface of the gutter, is made of resin or cloth, and is also a particulate collection member . The second storage tank is
a supernatant wastewater storage chamber that receives supernatant wastewater flowing from a gutter provided in the first storage tank;
a water level measurement chamber for receiving supernatant wastewater overflowing from the supernatant wastewater storage chamber;
Equipped with
In the water level measurement room,
A water level measuring member,
a liquid sending member that extracts supernatant wastewater from the water level measuring chamber according to the measurement result of the water level measuring member;
The wastewater treatment system according to claim 1, wherein a wastewater treatment system is installed. A liquid splash prevention member is provided from the opening of the drain pipe that introduces waste water from above the first storage tank to at least the level of the liquid level of the first storage tank from which the supernatant waste water is discharged. The wastewater treatment system according to claim 1 or 2 , wherein the opening of the drain pipe is covered and the tip of the liquid splash prevention member is buried under the water surface . The wastewater treatment system according to any one of claims 1 to 3, wherein a collecting member for abrasive powder is provided on the bottom surface of the gutter. The wastewater treatment system according to any one of claims 1 to 4, wherein the stretching member is made of at least one of a resin film and a cloth. a first storage tank that receives wastewater;
a second storage tank that receives supernatant wastewater flowing from a gutter provided in the first storage tank;
has
The gutter is provided with a draining member that prevents liquid from dripping through the gutter, and an extending member that extends the flow path of the supernatant drainage,
The gutter is a square gutter,
The draining member is a flexible member extending downward from the back surface of the bottom surface of the gutter across the width direction of the gutter,
The stretching member is installed on the bottom surface of the gutter, is made of at least one of a resin film and cloth, and is also a particulate collection member,
The second storage tank is
a supernatant wastewater storage chamber that receives supernatant wastewater flowing from a gutter provided in the first storage tank;
a water level measurement chamber for receiving supernatant wastewater overflowing from the supernatant wastewater storage chamber;
Equipped with
In the water level measurement room,
A water level measuring member,
a liquid sending member that extracts supernatant wastewater from the water level measuring chamber according to the measurement result of the water level measuring member;
is installed,
A liquid splash prevention member is provided from the opening of the drain pipe that introduces waste water from above the first storage tank to at least the level of the liquid level of the first storage tank from which the supernatant waste water is discharged. A wastewater treatment system in which the opening of the drain pipe is covered and the tip of the liquid splash prevention member is buried below the water surface . A wastewater treatment method using the wastewater treatment system according to any one of claims 1 to 6 ,
A wastewater treatment method, wherein polishing powder contained in wastewater received by the first storage tank and contained in supernatant wastewater flowing through the gutter is collected by adhering to the elongated member.