JP2019130492A - Sedimentation basin facility - Google Patents

Abstract

To provide a sedimentation basin facility for strengthening the function of precipitation-separation, in the sedimentation basin facility having a sludge scraping-up machine for the problem of the present invention.SOLUTION: For solving the problem, a sedimentation basin facility is provided having a sludge scraping-up machine for scraping up sludge deposited on a basin bottom of a sedimentation basin or a scum of floating in the water surface vicinity of the sedimentation basin and a precipitation promotion part for promoting precipitation of solid matter, that is, the sedimentation basin facility, where the sludge scraping-up machine comprises a flight for scraping up the sludge or the scum and an endless chain for supporting the flight, and the precipitation promotion part is arranged in a space enclosed by the flight and the endless chain, and is installed in substantially parallel to the flow direction of treated water introduced into the sedimentation basin.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a sedimentation basin facility provided with a sludge scraping machine for scraping sludge accumulated on the bottom of a sedimentation basin.

  In water treatment facilities such as a sewage treatment plant, a wastewater treatment plant, and a water purification plant, a sedimentation basin is provided for sedimentation and separation of solid matter such as sludge contained in the water to be treated. In addition, the sedimentation basin is equipped with a sludge scraping machine to scrape the sludge that has settled and separated, and the collected sludge is collected in the sludge pit and discharged from the discharge pipe to the outside of the sedimentation basin. .

  Patent Document 1 describes a sedimentation basin facility provided with a sludge scraping machine, in which an upward flow-type inclined plate is provided at the rear stage of the sludge scraping machine. This upward flow type inclined plate functions as a settling device.

JP 2001-187303 A

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

As a result of earnestly examining the above problems, the present inventor, in a sedimentation basin facility equipped with a sludge scraper, provided a sedimentation facilitating unit in a space surrounded by a flight of sludge scraper and an endless chain, thereby treating The present invention was completed by finding that a high-capacity sedimentation basin facility could be obtained.
That is, this invention is the following sedimentation basin facilities.

  The sedimentation basin equipment of the present invention for solving the above-mentioned problems promotes the sedimentation of solid matter and the sludge scraping machine that scrapes the sludge accumulated on the bottom of the sedimentation basin or the scum floating near the water surface of the sedimentation basin, and the sedimentation of solid matter. A sedimentation basin facility comprising a settling accelerating portion, wherein the sludge scraper includes a flight for scraping sludge or scum, and an endless chain that supports the flight, and the settling accelerating portion includes a flight and an endless It arrange | positions in the space enclosed by the chain, and is installed substantially parallel with the flow direction of the to-be-processed water introduced into a sedimentation basin.

  The sedimentation basin equipment of this invention has the characteristics that a sedimentation promotion part is arrange | positioned in the space enclosed by the flight and endless chain which comprise a sludge scraper. The water to be treated input to the sedimentation basin facility is a solid with a low sedimentation rate because solids of high specific gravity settle immediately after the addition, and then pass through the sedimentation basin facility while slowly separating and separating the solids. Sinks far into the sludge pit. The solid matter that has settled far away from the sludge pit is likely to re-float, and the sludge scraped on the downstream side in the flow direction of the treated water may re-float and flow out with the treated water. According to the feature of the present invention that the sedimentation promoting part is arranged in the space surrounded by the flight and the endless chain, the solid matter is promoted in the area close to the sludge pit, so that it is resuspended when the sludge is scraped off. It is possible to suppress the solid matter that flows out together with the water to be treated.

  Furthermore, the sedimentation basin equipment of this invention has the characteristics that a sedimentation promotion part is arrange | positioned substantially parallel with respect to the flow direction of to-be-processed water. The sedimentation promoting part of the present invention is a structure installed under the surface of the water to be treated, and in the region where the structure and the water to be treated are in contact with each other, the flow rate of the water to be treated is reduced by the frictional resistance with the structure. . This decrease in flow rate promotes sedimentation of solids. 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, and an action that prevents sedimentation of the solid matter occurs. In the sedimentation promoting portion of the present invention, the structure is disposed substantially parallel to the flow direction of the water to be treated, so that the sedimentation can be promoted without blocking the flow of the water to be treated.

Moreover, as one embodiment of the sedimentation basin equipment of this invention, a sedimentation promotion part is the several sedimentation promotion board arrange | positioned substantially parallel with respect to the flow direction of to-be-processed water, It is characterized by the above-mentioned.
According to this feature, the use of the sedimentation promotion plate as the sedimentation promotion part increases the area where the water to be treated comes into contact with the sedimentation promotion part, thereby further demonstrating the effect of the present invention that promotes sedimentation of solid matter. can do.

Moreover, as one embodiment of the sedimentation basin equipment of the present invention, the sedimentation accelerating portion is arranged downstream in 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, since the water to be treated containing a high-concentration solid immediately after being introduced into the sedimentation basin facility does not directly pass through the sedimentation promoting part, clogging of the sedimentation promoting part can be prevented.

Moreover, as one embodiment of the sedimentation basin equipment of this invention, the length of the longitudinal direction of a sedimentation acceleration | stimulation part is more than the pitch interval of the flight in a 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 part has resistance to the flow of the water to be treated, if there is a watershed where the sedimentation promoting part does not exist, the water to be treated is likely to short-circuit without passing through the sedimentation promoting part. By setting the longitudinal length of the sedimentation acceleration part to be equal to or greater than the flight pitch interval in the sludge scraper, the water to be treated is promoted to settle because both the upper and lower parts of the sedimentation acceleration part are always applied. It is possible to prevent a short circuit without passing through the part, and to more reliably promote sludge settling.

  ADVANTAGE OF THE INVENTION According to this invention, the sedimentation basin equipment provided with the sludge scraper can provide the sedimentation basin equipment with which the function of sedimentation separation was reinforced.

It is a schematic explanatory drawing which shows the structure of the sedimentation 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 (II arrow directional 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 sedimentation basin equipment of the 2nd embodiment of this invention. It is a schematic explanatory drawing which shows the structure of the sedimentation 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 line view of FIG. 5).

  The sedimentation basin equipment of the present invention comprises a sludge scraping machine that scrapes sludge accumulated on the bottom of the sedimentation basin or the scum floating near the water surface of the sedimentation basin, and a sedimentation promoting unit that promotes sedimentation of solid matter. The sludge scraper is equipped with a flight for scraping sludge or scum and an endless chain that supports the flight, and the sedimentation promoting part is located in a space surrounded by the flight and the endless chain. It is arrange | positioned and it is installed substantially parallel with the flow direction of the to-be-processed water introduced into a sedimentation basin.

  Hereinafter, embodiments of the sedimentation basin facility according to the present invention will be described in detail with reference to the drawings. In addition, about the structure of the sedimentation basin, sludge scraping machine, and sedimentation acceleration | stimulation part described in an embodiment, it illustrated only in order to demonstrate the sedimentation basin equipment which concerns on this invention, and is not limited to this.

[First Embodiment]
FIG. 1 is a schematic explanatory view showing the structure of a sedimentation basin facility 1a equipped with a sludge scraper according to the first embodiment of the present invention.
As shown in FIG. 1, the sedimentation basin facility 1a includes a sedimentation basin 10 such as a sewage treatment plant or a water purification plant, a sludge scraper 20 and a solid sedimentation accelerating unit 30 installed therein.

[Settling pond]
The sedimentation basin 10 is configured to be horizontally long, and treated water 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 site 10 on the treated water supply side, and the sludge pit 10b is provided with a discharge pipe 10c for discharging sludge to the outside.

  In addition, a scum discharge device 11 composed of a scum pipe that can rotate around an axis is provided over the entire width of the sedimentation basin 10 in the width direction (perpendicular to the paper surface). Yes. An opening extending in the axial direction is formed on the upper peripheral surface of the scum pipe, and the cross-sectional shape is C-shaped. Then, the scum pipe is rotated counterclockwise in FIG. 1 so that the floating portion (scum) floating on the water surface 10d is collected so that the opening portion is located below the water surface 10d, and then returns.

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

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

  The driving sprocket 21a and one driven sprocket 21b are installed in the vicinity of the water surface 10d, and the endless chain 22a hung between them is moved substantially horizontally along the water surface 10d. The scum floating on the water surface 10d is scraped toward the scum discharge device 11 by the flight 23 attached to the endless chain 22a.

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

  Known shapes can be used as the shapes of the endless chains 22a and 22b. Examples of the shapes of the endless chains 22a and 22b include a bushed chain, a roller chain, and a notch chain. From the viewpoint that it is easy to install an attachment for attaching the flight 23, a notch chain is preferable.

  Moreover, a known material can be used for the material of the endless chains 22a and 22b. Examples of the material of the endless chains 22a and 22b include a metal chain and a resin chain. Since the resin chain is lightweight, it has not only an advantage that the assembling work and the exchange work are easy, but also an advantage that the exchange frequency is reduced because of excellent corrosion resistance. Therefore, in the present invention, a resin chain is preferable as the material of the endless chains 22a and 22b.

[Settling accelerating part]
FIG. 2 is a schematic explanatory view showing the structure of the sedimentation accelerating portion 30 according to the first embodiment of the present invention (a view taken along the line II in FIG. 1).
As shown in FIG. 2, the settling promoting portion 30 is composed of a plurality of settling promoting plates 31 installed substantially parallel to the flow direction of the water to be treated W, and is surrounded by a flight 23 and an endless chain 2 a ( Hereinafter, it is referred to as “scraper internal space”). When the water W to be treated passes between the plurality of sedimentation promotion plates 31, friction resistance is generated by contacting the plate surface of the sedimentation promotion plate 31, so that the flow velocity in the vicinity of the plate surface decreases. The decrease in the flow rate can promote solid sedimentation.

  Moreover, the sedimentation promotion 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 to block the water to be treated W in order to reduce the flow rate of the water to be treated W, the flow of the water to be treated W changes in the vertical direction, and the solid matter that has settled re-floats. is there. 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, so Floating can be suppressed. From such technical significance, the sedimentation promoting part “installed substantially parallel to the flow direction of the water to be treated” in the present invention refers to the water W to be treated while reducing the flow rate of the water W to be treated. Is a structure that does not change the flow of the water to be treated W in the vertical direction when the water passes. That is, the sedimentation promoting portion of the present invention is not only for linearly passing the water to be treated W as in the first embodiment, but also for changing the flow of the water to be treated W in the horizontal direction. May be.

  Moreover, since the sedimentation promotion part 30 of this invention is arrange | positioned in the space enclosed by a flight and an endless chain, sedimentation of a solid substance is carried out in the near side (the flow direction upstream of the to-be-processed water W) of the sedimentation basin 10. Facilitate. Thereby, it can prevent that a solid substance settles in the flow direction downstream of the to-be-processed water W, and can suppress that a solid substance is discharged | emitted from the sedimentation basin 10 with a treated water.

  The sedimentation promotion plate 31 is installed by inclining the plate member so that the mounting angle θ is approximately 60 ° with respect to the vertical direction of the pond bottom 10a. By installing the settling acceleration plate 31 at an inclination, the effective settling area (= inclined plate length × cos θ × inclination width) in the settling acceleration portion 30 can be increased. Thereby, sedimentation of sludge can be promoted 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, solids may be deposited on the settling acceleration plate 31. Therefore, the mounting angle θ is preferably 30 ° or more, more preferably 40 ° or more, and particularly preferably. It is 50 ° or more.

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

  The shape of the sedimentation promoting portion 30 is not limited to a plate-like member. FIG. 3 shows 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 stretched with a mesh 33, a cloth-like member stretched with a cloth, or the like may be installed like the settling acceleration 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 where the sedimentation promoting unit 30 is disposed in the internal space of the scraper is located upstream in the flow direction of the water to be treated W, the solids are easily clogged by the sedimentation promoting unit 30 because the solid content is large. Therefore, it is preferable that the arrangement | positioning location of the sedimentation acceleration | stimulation part 30 in the scraper interior space is the downstream of the flow direction of the to-be-treated water W. Specifically, as shown in the figure, the distance between the most upstream sprocket (drive sprocket 21a) and the most downstream sprocket (driven sprocket 21b) installed near the water surface 10d in the sludge scraper 20 is as follows. On the other hand, it is preferable to arrange the sedimentation promoting portion 30 in a range on the downstream side when the upstream and downstream are equally divided.

[Second Embodiment]
FIG. 4 is a schematic explanatory view showing the structure of a sedimentation basin facility 1b equipped with a sludge scraper according to the second embodiment of the present invention.
As shown in FIG. 4, the sedimentation basin equipment 1b of the second embodiment of the present invention has a length L1 in the longitudinal direction of the sedimentation promoting plate 31 that is equal to or greater than the pitch interval L2 of the flight 23 of the sludge scraper 20. It is. Other configurations are the same as those of the first embodiment.
According to this structure, since the flight 23 is always applied in the vertical direction of the sedimentation promoting plate 31, the treated water W is prevented from being short-circuited without passing through the sedimentation promoting unit 30, and solid sedimentation is promoted. Can be performed more reliably.

[Third Embodiment]
FIG. 5 is a schematic explanatory view showing the structure of a settling basin facility 1c equipped with a sludge scraper according to a third embodiment of the present invention.
As shown in FIG. 5, the sedimentation basin equipment 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 those of the first embodiment.

The chain guide rails 25a and 25b are for maintaining the endless chain 22a passing in the horizontal direction on the water surface 10d and the pond bottom 10a in the horizontal direction.
According to the chain guide rails 25a and 25b, the endless chain 22a on the water surface side of the sludge scraper 20 does not sag, so that the settling promoting portion 30 is damaged or endless due to contact between the endless chain 22a and the settling promoting portion 30. Troubles such as dropping of the chain 22a can be prevented. Moreover, as shown in FIG. 6, it becomes possible to provide the sedimentation promoting part 30 also inside the endless chain 22a that circulates, and the treated water W is prevented from being short-circuited without passing through the sedimentation promoting part 30. Can do.

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 drive sprocket 21a and one driven sprocket 21b. Rails 25a are installed.
A chain guide rail 25b for moving the endless chain 22a substantially horizontally along the pond bottom 10a is also installed between the remaining two driven sprockets 21c and 21d.

  In addition, although the chain guide rail is installed on both the water surface 10d side and the pond bottom 10a side, it may be installed only on the water surface 10d side. Moreover, although provided in the whole region between the drive sprocket 21a and the driven sprocket 21b and between the driven sprockets 21c and 21d, it suffices to be installed at least on the settling acceleration portion 30.

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

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

For example, the sedimentation promoting unit in the sedimentation basin facility of the present embodiment may include a plurality of sedimentation promotion plates as one unit, and the plurality of units arranged along the flow direction of the water to be treated. The units may be installed with the same mounting angle, and the mounting angle may be different for each unit.
When the mounting angles of the plurality of units are set to the same angle, the solids settle in the same direction between the plurality of units, so that the solids can be stably settled. Therefore, it is suitable when sedimenting small particles that are likely to re-suspend due to disturbance of the flow of water to be treated.
On the other hand, when the mounting angles of the plurality of units are set to different angles, the flow rate of the water to be treated is further reduced in the subsequent unit, and the sedimentation of the solid matter can be further promoted. Therefore, it is suitable for the case where large particles that do not affect even if the flow of water to be treated is somewhat disturbed are quickly settled.

  Moreover, the sedimentation basin equipment of this embodiment is good also as what provides the conventional upward flow type inclination board in the back | latter stage of the sludge scraping machine 20. FIG. Thereby, it becomes possible to improve the function of a sedimentation basin more.

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

1a, 1b, 1c Sedimentation basin equipment, 10 sedimentation 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 sprocket for motor, 25a, 25b chain guide rail, 30 settling acceleration part, 31 settling acceleration plate, 32 string-like body, 33 mesh, L1 longitudinal direction of settling acceleration plate Length, L2 flight pitch interval, W treated water

Claims (4)

A sludge scraper that scrapes sludge accumulated at the bottom of the sedimentation basin or scum floating near the water surface of the sedimentation basin;
A sedimentation basin facility comprising a sedimentation facilitating section that promotes sedimentation of solid matter,
The sludge scraping machine comprises a flight that scrapes sludge or scum, and an endless chain that supports the flight,
The sedimentation promoting part is disposed in a space surrounded by the flight and the endless chain, and is installed substantially parallel to a flow direction of water to be treated introduced into a sedimentation basin. Pond equipment.   The settling basin equipment according to claim 1, wherein the settling accelerating portion is a plurality of settling accelerating plates arranged substantially parallel to the flow direction of the water to be treated.   The sedimentation according to claim 1 or 2, wherein the sedimentation promoting part is disposed downstream of a flow direction of water to be treated in a space surrounded by the flight and the endless chain. Pond equipment. The length of the longitudinal direction of the said sedimentation acceleration | stimulation part is more than the pitch interval of the said flight in the said sludge scraper, The sedimentation basin equipment as described in any one of Claims 1-3 characterized by the above-mentioned.

Images