JP6984811B2 - Settling basin equipment - Google Patents

Description

The present invention relates to a settling basin facility equipped with a sludge scraper for scraping sludge accumulated on the bottom of the settling basin.

In water treatment facilities such as sewage treatment plants, wastewater treatment plants, and water purification plants, sedimentation basins are installed to separate sediments such as sludge contained in the water to be treated. In addition, a sludge scraper is installed in the settling basin to scrape the sludge that has settled and separated, and the sludge that has been scraped off is collected in the sludge pit and discharged from the discharge pipe to the outside of the settling basin. ..

Patent Document 1 describes a settling basin facility equipped with a sludge scraper in which an upward flow type inclined plate is provided after the sludge scraper. This upward flow type inclined plate functions as a settling device.

Japanese Unexamined Patent Publication No. 2001-187303

An object of the present invention is to provide a settling basin facility having an enhanced settling separation function in a settling basin facility equipped with a sludge scraper.

As a result of diligent studies on the above-mentioned problems, the present inventor has made a treatment by providing a settling promotion unit in a space surrounded by the flight of the sludge scraper and the endless chain in the settling basin facility equipped with the sludge scraper. The present invention was completed by finding that a high-capacity settling basin facility can be obtained.
That is, the present invention is the following settling basin equipment.

The settling basin facility of the present invention for solving the above problems promotes a sludge scraper that attracts sludge accumulated on the bottom of the settling basin or scum floating near the water surface of the settling basin, and sedimentation of solid matter. A settling basin facility with a settling basin, the sludge scraper is equipped with a flight that scrapes sludge or scum, and an endless chain that supports the flight, and the settling basin is a flight and endless. It is arranged in a space surrounded by a chain, and is characterized by being installed substantially parallel to the flow direction of the water to be treated introduced into the settling basin.

The settling basin facility of the present invention is characterized in that a settling promotion unit is arranged in a space surrounded by a flight constituting a sludge scraper and an endless chain. As for the water to be treated, the solid matter with high specific gravity settles immediately after being put into the settling basin facility, and then the solid matter passes through the settling basin facility while slowly settling and separating the solid matter. Settles far away in the sludge pit. Solids that have settled far away from the sludge pit are likely to re-float, and sludge that has been scraped off on the downstream side in the flow direction of the water to be treated may re-float and flow out with the treated water. According to the feature of the present invention that the sedimentation promoting portion is arranged in the space surrounded by the flight and the endless chain, the sedimentation is promoted in the region near the sludge pit, so that the solid matter is re-floated when the sludge is scraped off. It is possible to prevent the solid matter to flow out together with the water to be treated.

Further, the settling basin facility of the present invention has a feature that the settling basin is arranged substantially parallel to the flow direction of the water to be treated. The sedimentation promoting portion of the present invention is a structure installed below the surface of the water to be treated, and in the region where the structure and the water to be treated come into contact with each other, the flow velocity of the water to be treated decreases due to the frictional resistance with the structure. .. This decrease in flow velocity promotes sedimentation of solid matter. On the other hand, when the flow of the water to be treated is blocked by the structure, the flow of the water to be treated is disturbed in the vertical direction, which has an effect of hindering the sedimentation of the solid matter. In the sedimentation promoting portion of the present invention, since the structure is arranged substantially parallel to the flow direction of the water to be treated, sedimentation can be promoted without blocking the flow of the water to be treated.

Further, one embodiment of the settling basin facility of the present invention is characterized in that the settling basin is a plurality of settling basin plates arranged substantially parallel to the flow direction of the water to be treated.
According to this feature, by using the sedimentation promoting plate as the sedimentation promoting portion, the region where the water to be treated is in contact with the sedimentation promoting portion becomes large, so that the effect of the present invention of promoting the sedimentation of the solid matter is further exhibited. can do.

Further, as one embodiment of the settling basin facility of the present invention, the settling basin is arranged on the downstream side with respect to the flow direction of the water to be treated in the space surrounded by the flight and the endless chain. And.
According to this feature, the water to be treated containing a high-concentration solid matter immediately after being introduced into the settling basin facility does not directly pass through the settling promotion section, so that clogging of the settling promotion section can be prevented.

Further, one embodiment of the settling basin facility of the present invention is characterized in that the length of the settling basin in the longitudinal direction is equal to or larger than the flight pitch interval in the sludge scraper.
Since a region through which the flight passes is formed above or below the sedimentation promoting portion, the sedimentation promoting portion is not installed. Since the sedimentation promoting portion causes resistance to the flow of the water to be treated, if there is a basin in which the sedimentation promoting portion does not exist, the water to be treated does not pass through the sedimentation promoting portion and is likely to be short-circuited. By setting the length of the settling promotion section in the longitudinal direction to be equal to or greater than the flight pitch interval in the sludge scraper, the flight is always applied to both the upper and lower sides of the settling promotion section, so that the water to be treated promotes settling. It is possible to prevent short-circuiting without passing through the portion and to promote the sedimentation of sludge more reliably.

According to the present invention, in a settling basin facility equipped with a sludge scraper, it is possible to provide a settling basin facility with an enhanced settling separation function.

It is a schematic explanatory drawing which shows the structure of the settling basin equipment of the 1st Embodiment of this invention. It is a schematic explanatory drawing which shows the structure of the sedimentation promotion part of the 1st Embodiment of this invention (I-I arrow view of FIG. 1). It is a schematic explanatory drawing which shows another aspect of the sedimentation promotion part of the 1st Embodiment of this invention. It is a schematic explanatory drawing which shows the structure of the settling basin equipment of the 2nd Embodiment of this invention. It is a schematic explanatory drawing which shows the structure of the settling basin equipment of the 3rd Embodiment of this invention. It is a schematic explanatory drawing which shows the structure of the sedimentation promotion part of the 3rd Embodiment of this invention (II-II arrow view of FIG. 5).

The settling basin facility of the present invention is provided with a sludge scraper that scoops up sludge accumulated on the bottom of the settling basin or scum floating near the water surface of the settling basin, and a settling promotion unit that promotes the settling of solid matter. In the settling basin facility, the sludge scraper is equipped with a flight that scrapes sludge or scum and an endless chain that supports the flight, and the sedimentation promotion unit is in the space surrounded by the flight and the endless chain. It is characterized in that it is installed in a manner substantially parallel to the flow direction of the water to be treated introduced into the settling basin.

Hereinafter, embodiments of the settling basin facility according to the present invention will be described in detail with reference to the drawings. The structures of the settling basin, the sludge scraper, and the settling basin according to the embodiment are merely exemplified for explaining the settling basin equipment according to the present invention, and are not limited thereto.

[First Embodiment]
FIG. 1 is a schematic explanatory view showing the structure of a settling basin facility 1a provided with a sludge scraper according to the first embodiment of the present invention.
As shown in FIG. 1, the settling basin facility 1a includes a settling basin 10 such as a sewage treatment plant and a water purification plant, a sludge scraper 20 installed inside the settling basin, and a solid matter settling promotion section 30.

[Settling basin]
The settling basin 10 is formed horizontally, and water to be treated such as sewage is supplied from the left side of FIG. A sludge pit 10b is provided at the end of the pond bottom 10a of the sedimentation basin 10a on the water supply side, and the sludge pit 10b is provided with a discharge pipe 10c for discharging sludge to the outside.

Further, in the vicinity of the water surface 10d at the substantially central portion of the settling basin 10, a scum discharge device 11 made of a scum pipe that can rotate around an axis is provided over the entire width of the settling basin 10 in the width direction (vertical direction of the paper surface). There is. An opening extending in the axial direction is formed on the peripheral surface above the scum pipe, and the cross-sectional shape is C-shaped. Then, the scum pipe rotates counterclockwise in FIG. 1 so that the opening is located below the water surface 10d in order to collect the floating matter (scum) floating on the water surface 10d, and then repeats the operation of returning.

[Sludge scraper]
The sludge scraper 20 includes an endless chain 22a that orbits in the settling basin 10 in the longitudinal direction. A pair of endless chains 22a are installed facing the settling basin 10 in the width direction (vertical to the paper surface), and the pair of endless chains 22a have flights (scraping blades) extending in the width direction of the settling basin 10. A plurality of 23 are arranged along the circumferential direction. The flight 23 is attached so as to horizontally support a pair of endless chains 22a, and both ends of the flight 23 extend from the endless chain 22a to the outside in the width direction of the settling basin 10 and are near the side wall of the settling basin 10. positioned.

As shown in FIG. 1, the endless chain 22a is hung around the driving sprocket 21a and the three driven sprockets 21b, 21c, 21d, and is attached so as to orbit in the settling basin 10. Further, the endless chain 22b is hung around the drive sprocket 21a and the motor sprocket 24a provided on the motor 24, and the power of the motor 24 is transmitted to the endless chain 22a.

The drive sprocket 21a and one driven sprocket 21b are installed near the water surface 10d, and the endless chain 22a hung between them is moved substantially horizontally along the water surface 10d. Then, the flight 23 attached to the endless chain 22a scrapes the scum floating on the water surface 10d toward the scum discharge device 11 described above.

Further, the remaining two driven sprockets 21c and 21d are installed near the pond bottom 10a, and the endless chain 22a hung between them is moved substantially horizontally along the pond bottom 10a. Then, the sludge accumulated on the pond bottom 10a is attracted to the sludge pit 10b by the flight 23 attached to the endless chain 22a. The sludge collected in the sludge pitch 10b is discharged from the discharge pipe 10c to the outside of the settling basin 10.

As the shape of the endless chains 22a and 22b, known shapes can be used. Examples of the shapes of the endless chains 22a and 22b include bushed chains, roller chains, and notched chains. A notch type chain is preferable from the viewpoint that it is easy to install an attachment for attaching the flight 23.

Further, as the material of the endless chains 22a and 22b, known materials can be used. Examples of the material of the endless chains 22a and 22b include metal chains and resin chains. Since the resin chain is lightweight, it has the advantage of facilitating assembly work and replacement work, and also has the advantage of being excellent in corrosion resistance and thus reducing the frequency of replacement. Therefore, in the present invention, a resin chain is preferable as the material of the endless chains 22a and 22b.

[Sedimentation promotion unit]
FIG. 2 is a schematic explanatory view showing the structure of the sedimentation promoting portion 30 according to the first embodiment of the present invention (I-I arrow view in FIG. 1).
As shown in FIG. 2, the sedimentation promoting portion 30 is composed of a plurality of sedimentation promoting plates 31 installed substantially parallel to the flow direction of the water to be treated W, and is a space surrounded by the flight 23 and the endless chain 2a. Hereinafter, it is arranged in the "internal space of the scraper"). When the water W to be treated passes between the plurality of sedimentation promoting plates 31, frictional resistance is generated by coming into contact with the plate surface of the sedimentation promoting plate 31, so that the flow velocity in the vicinity of the plate surface decreases. This decrease in flow velocity can promote the sedimentation of solid matter.

Further, the sedimentation promoting plate 31 of the present invention is installed substantially parallel to the flow direction of the water to be treated W. If a structure is installed so as to dam the water to be treated in order to reduce the flow velocity of the water to be treated W, the flow of the water to be treated W changes in the vertical direction, and there is a problem that the settled solid matter resuspends. be. However, according to the sedimentation promoting plate 31 of the present invention, since it is installed substantially parallel to the flow direction of the water to be treated W, the flow of the water to be treated W does not change in the vertical direction, and the solid matter is regenerated. Floating can be suppressed. From such a technical significance, the sedimentation promoting portion "installed substantially parallel to the flow direction of the water to be treated" in the present invention means the water to be treated W while reducing the flow velocity of the water to be treated W. It is a structure that does not change the flow of the water to be treated W in the vertical direction when the water passes through. That is, the sedimentation promoting portion of the present invention not only allows the water to be treated W to pass linearly as in the first embodiment, but also changes the flow of the water to be treated W in the horizontal direction. You may.

Further, since the sedimentation promoting portion 30 of the present invention is arranged in the space surrounded by the flight and the endless chain, the sedimentation of solid matter occurs on the front side of the sedimentation basin 10 (upstream side in the flow direction of the water to be treated W). Facilitate. As a result, it is possible to prevent the solid matter from settling on the downstream side in the flow direction of the water to be treated W, and to prevent the solid matter from being discharged from the settling basin 10 together with the treated water.

The sedimentation promoting plate 31 is installed by tilting the plate-shaped member so that the mounting angle θ is approximately 60 ° with respect to the vertical direction of the pond bottom 10a. By installing the sedimentation promoting plate 31 in an inclined manner, it is possible to increase the effective sedimentation area (= inclined plate length × cosθ × inclined width) in the sedimentation promoting portion 30. This makes it possible to promote the sedimentation of sludge without obstructing the flow of the water to be treated W. From the viewpoint of increasing the effective sedimentation area, the mounting angle θ is preferably 90 ° or less, more preferably 80 ° or less, and particularly preferably 70 ° or less. On the other hand, if the mounting angle θ is low, solid matter may be deposited on the sedimentation promoting plate 31, so the mounting angle θ is preferably 30 ° or more, more preferably 40 ° or more, and particularly preferably 40 ° or more. It is 50 ° or more.

The material of the sedimentation promoting plate 31 is not particularly limited, and examples thereof include metal such as stainless steel and plate-shaped members made of plastic. From the viewpoint of light weight and excellent water resistance, a plastic plate-shaped member is preferable.

The shape of the sedimentation promoting portion 30 is not limited to the plate-shaped member. FIG. 3 is another structure of the sedimentation promoting portion of the first embodiment of the present invention. As shown in FIG. 3, a thread-like member in which a plurality of string-like bodies 32 are arranged, a mesh-like member in which a mesh 33 is stretched, a cloth-like member in which a cloth is stretched, or the like may be installed like a settling promotion plate 31. .. Since the thread-like member and the mesh-like member permeate the water to be treated W, they may be installed perpendicular to the water to be treated W.

If the location of the sedimentation promoting portion 30 in the internal space of the scraper is on the upstream side in the flow direction of the water to be treated W, the content of solid matter is large, so that the sedimentation promoting portion 30 is likely to be clogged with solid matter. Therefore, it is preferable that the place where the sedimentation promoting portion 30 is arranged in the internal space of the scraper is on the downstream side in the flow direction of the water to be treated W. Specifically, as shown in the figure, at the distance between the most upstream sprocket (driving sprocket 21a) and the most downstream sprocket (driven sprocket 21b) installed near the water surface 10d in the sludge scraper 20. On the other hand, it is preferable to arrange the sedimentation promoting portion 30 in the range on the downstream side when the upstream and the downstream are divided into two equal parts.

[Second Embodiment]
FIG. 4 is a schematic explanatory view showing the structure of the settling basin facility 1b provided with the sludge scraper according to the second embodiment of the present invention.
In the settling basin facility 1b of the second embodiment of the present invention, as shown in FIG. 4, the length L1 of the settling basin 31 in the longitudinal direction is set to the pitch interval L2 or more of the flight 23 of the sludge scraper 20. Is. Other configurations are the same as in the first embodiment.
According to this structure, since the flight 23 is always hung in the vertical direction of the sedimentation promoting plate 31, it is possible to prevent the water W to be treated from short-circuiting without passing through the sedimentation promoting portion 30 and promote the sedimentation of solid matter. Can be performed more reliably.

[Third Embodiment]
FIG. 5 is a schematic explanatory view showing the structure of the settling basin facility 1c provided with the sludge scraper according to the third embodiment of the present invention.
As shown in FIG. 5, the settling basin facility 1c according to the third embodiment of the present invention includes a sludge scraper 20 having chain guide rails 25a and 25b. Other configurations are the same as in the first embodiment.

The chain guide rails 25a and 25b are for horizontally maintaining the endless chain 22a that passes horizontally at the water surface 10d and the pond bottom 10a.
According to the chain guide rails 25a and 25b, since the endless chain 22a on the water surface side of the sludge scraper 20 does not sag, the settling promoting portion 30 is damaged or endless due to the contact between the endless chain 22a and the settling promoting portion 30. It is possible to prevent troubles such as the chain 22a falling off. Further, as shown in FIG. 6, it is possible to provide a sedimentation promoting portion 30 inside the orbiting endless chain 22a to prevent the water W to be treated from short-circuiting without passing through the sedimentation promoting portion 30. Can be done.

Specifically, as shown in FIG. 5, in the sludge scraper 20, a chain guide for moving the endless chain 22a substantially horizontally along the water surface 10d between the driving sprocket 21a and one driven sprocket 21b. The rail 25a is installed.
Further, between the remaining two driven sprockets 21c and 21d, a chain guide rail 25b for moving the endless chain 22a substantially horizontally along the pond bottom 10a is installed.

Although the chain guide rails are installed on both the water surface 10d side and the pond bottom 10a side, they may be installed only on the water surface 10d side. Further, although it is provided in the entire area between the driven sprocket 21a and the driven sprocket 21b and between the driven sprocket 21c and 21d, it may be installed at least on the settling promoting portion 30.

The material of the chain guide rails 25a and 25b is not particularly limited, but for example, a metal such as stainless steel or a resin such as ultra-high molecular weight polyethylene can be used. It may be made of the same material as the endless chain 22a, or may be made of a different material. However, it is preferable to select the material in consideration of the fact that the chain guide rails 25a and 25b and the endless chain 22a come into contact with each other and slide. In consideration of strength, it is preferable to use a metal chain guide rail such as stainless steel, and to provide a resin sliding portion such as ultra-high molecular weight polyethylene on the sliding portion with the endless chain 22a.

The above-mentioned embodiment shows an example of the sedimentation basin equipment. The settling basin equipment according to the present invention is not limited to the above-described embodiment, and the settling basin equipment according to the above-described embodiment may be modified without changing the gist.

For example, in the settling basin facility of the present embodiment, a plurality of settling promotion plates may be used as one unit, and a plurality of units may be arranged along the flow direction of the water to be treated. Further, the units may be installed at the same mounting angle, or the mounting angles may be different for each unit.
When the mounting angles of the plurality of units are set to the same angle, the solid matter is settled in the same direction among the plurality of units, so that the solid matter can be settled stably. Therefore, it is suitable for sedimenting small particles that are likely to resuspend due to the turbulence of the flow of water to be treated.
On the other hand, if the mounting angles of the plurality of units are set to different angles, the flow velocity of the water to be treated is further reduced in the subsequent units, and the sedimentation of the solid matter can be further promoted. Therefore, it is suitable for quickly settling large particles that are not affected even if the flow of water to be treated is slightly disturbed.

Further, in the settling basin equipment of the present embodiment, a conventional upward flow type inclined plate may be provided after the sludge scraper 20. This makes it possible to further improve the function of the settling basin.

The settling basin facility of the present invention is used for treating water to be treated containing solid matter such as sludge in, for example, a sewage treatment plant, a wastewater treatment plant, a water purification plant and the like.

1a, 1b, 1c settling basin equipment, 10 settling basin, 10a pond bottom, 10b sludge pit, 10c discharge pipe, 10d water surface, 11 scum discharge device, 20 sludge scraper, 21a drive sprocket, 21b, 21c, 21d driven sprocket , 22a, 22b Endless chain, 23 flight, 24 motor, 24a motor sprocket, 25a, 25b chain guide rail, 30 settling basin, 31 settling basin, 32 string, 33 mesh, L1 settling basin longitudinal direction Length, L2 flight pitch interval, W treated water

Claims (2)

A sludge scraper that scrapes sludge accumulated on the bottom of the settling basin or scum floating near the water surface of the settling basin.
A settling basin facility equipped with a settling basin that promotes the settling of solid matter.
The sludge scraper comprises a flight that scrapes sludge or scum and an endless chain that supports the flight.
The sedimentation promotion unit is arranged in a space surrounded by the flight and the endless chain.
The sedimentation promoting portion is a plurality of sedimentation promoting plates.
The sedimentation promoting plate is installed so as to be substantially parallel to the flow direction of the water to be treated introduced into the sedimentation basin and perpendicular to or inclined with respect to the bottom of the basin.
A settling basin facility characterized in that the length of the settling basin in the longitudinal direction is equal to or greater than the pitch interval of the flight in the sludge scraper. The settling basin facility according to claim 1, wherein the settling basin is arranged on the downstream side with respect to the flow direction of the water to be treated in the space surrounded by the flight and the endless chain. ..

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