KR20210116952A - Apparatus for collecting sludge from water - Google Patents

Abstract

The present invention relates to a sludge collecting device used in a water treatment process. The sludge collection device according to an embodiment of the present invention includes: a tower that is rotationally installed in a settling tank in which treated water is accommodated; a connecting bar arranged along the radial direction of the settling tank and having one end fixed to the tower; a scraper that is rotationally installed on the bottom of the settling tank and sweeps away sludge deposited on the bottom of the settling tank to guide the sludge to a penetration unit; and a support in which the lower end is coupled to the scraper and the upper end is coupled to the connecting bar to transmit the rotational force of the tower to the scraper, wherein the scraper is formed in a curved shape and is assembled by interconnecting a plurality of segments.

Description

Sludge collecting device of segment structure having a floating body {APPARATUS FOR COLLECTING SLUDGE FROM WATER}

The present invention relates to water treatment technology, and more particularly, to a sludge collecting device for collecting (or concentrating) sludge after precipitating sludge from tap water or sewage in a water treatment facility, sewage treatment facility, etc.

In water treatment facilities, water is drawn from a water source, and water is supplied to each household through a multi-step water treatment process. Since the target water is contaminated sewage in a sewage treatment facility, it undergoes a much more complicated and sophisticated sewage treatment process. Various water treatment methods are used in the wastewater treatment process as well as tap water and sewage.

Such a water treatment method essentially includes the process of sedimentation and collection of sludge. For example, in the case of the activated sludge method shown in FIG. 1, after primary and secondary sedimentation, the sludge is finally collected/concentrated in a thickener. As described above, the sedimentation of sludge in the water treatment process is made in multiple stages, and it is common that the sedimentation process is designed for each sludge particle size.

2 is a photograph of a sludge collector actually installed in a conventional sewage sludge settling tank.

Referring to FIG. 2 , treated water (ex: sewage) is introduced and accommodated in the settling tank 1 . A penetrating portion 2 is formed at the lower center of the settling tank 1 . The sludge deposited on the bottom of the settling tank 1 is collected toward the penetration part 2 by the collector 9 and discharged to the bottom through the penetration part 2 . A pump (not shown) is generally connected to the penetrating part 2 to discharge the sludge.

The sludge collector (9) is provided with a column (3) in the center of the settling tank (1). The pillar 3 is rotatable in place by a rotating means (not shown) such as a pump. A mounting portion 4 is fixedly installed on the upper side of the pillar 3 . A connecting bar 5 is disposed from the mounting part 4 to the upper surface of the outer wall part of the settling tank 1 . The connecting bar 5 is mounted on a rail (not shown) installed on the upper surface of the outer wall of the settling tank, so that when the column 3 rotates, it rotates along the rail. A scraper 7 is installed on the bottom surface of the settling tank 1 . Although only one scraper 7 may be disposed as shown in FIG. 2 , two or more may be installed. The scraper 7 is made of various shapes, but recently, a spiral shape as shown in the drawing has been widely used. The scraper 7 is fixed and supported on the connecting bar 5 by a plurality of support rods 8 .

When the column 3 is rotated in the sludge collector 9, the scraper 7 is rotated together and the sludge accumulated on the bottom of the sedimentation tank 1 is gradually moved and discharged through the through part 2 in the center of the sedimentation tank 1. Since the scraper 7 has a spiral shape, the sludge is gradually moved to the center of the settling tank by the scraper 7 .

The conventional sludge collector 9 described above has several problems.

First, it is not easy to manufacture. In particular, the scraper is made in the form of a spiral curve. In the prior art, since the scraper is integrally formed, there is a problem in that processing is not easy and the manufacturing cost is increased.

Second, several support bars (8) had to be installed to support the scraper's own weight. Since the support rod 8 moves across the treated water in the settling tank 1, turbulence is generated in the treated water. If the number of support rods is large, the turbulence in the treated water becomes more severe, so there is a problem that the settling time of the sludge in the treated water takes longer. In particular, this phenomenon is more pronounced when the particle size of the sludge is small. Generally, it takes about 33 minutes for sludge with a size of 0.01mm dust to settle. If turbulence occurs in the treated water, the settling time can be significantly increased from two to several tens of times. An increase in the sludge settling time is undesirable as it leads to a delay in the water treatment process.

Third, in the prior art, there was a problem in that all of the treated water in the settling tank had to be discharged in order to wash or partially replace the scraper. That is, there was a limit to maintenance due to the physical configuration of the scraper.

The present invention is to solve the above problems, it is possible to reduce the weight of the scraper to reduce the number of support rods, thereby increasing the sludge sedimentation efficiency, and to provide a sludge collecting device with an improved structure to facilitate production and maintenance. There is a purpose.

On the other hand, other objects not specified in the present invention will be additionally considered within the range that can be easily inferred from the following detailed description and effects thereof.

A sludge collecting device according to the present invention for achieving the above object, A tower rotatably installed in a settling tank in which treated water is accommodated; a connecting bar disposed along the radial direction of the settling tank and having one end fixed to the tower; a scraper rotatably installed on the bottom surface of the settling tank to sweep the sludge deposited on the bottom of the settling tank and guide it to the penetrating part; and a support having a lower end coupled to the scraper and an upper end coupled to the connecting bar to transmit the rotational force of the tower to the scraper, wherein the scraper is formed in a curved shape, and is assembled by interconnecting a plurality of segments There is a characteristic.

In one embodiment of the present invention, it is preferable that a buoyant body having a density lighter than water is attached to the scraper. More specifically, the buoyancy body has a curved shape corresponding to the shape of the scraper, and a hollow pipe having both ends blocked may be used.

In one embodiment of the present invention, the scraper is vertically movable. For example, one end of the scraper may be slidably coupled to the tower in a vertical direction so that the scraper may be moved vertically along the tower by a driving means such as a cylinder or a motor. In order to elevate only the scraper, the support for interconnecting the scraper and the connecting bar may use a bendable wire.

Meanwhile, in an example of the present invention, a rubber plate may be attached to the lower end of the scraper.

The sludge collecting device according to the present invention has the advantage that economical and simple manufacturing is possible by welding a plurality of straight segments to each other, rather than manufacturing a spiral scraper integrally as in the prior art.

In addition, in the present invention, the effect of lowering the overall weight of the scraper was expressed by installing a buoyancy body on the scraper. Through this, a thin wire can be used as a support instead of a truss structure using a plurality of steel materials as in the prior art, and it is possible to prevent disturbance of the treated water in the settling tank or the occurrence of turbulence by the support. Since there is no turbulence or disturbance in the treated water, the sludge can be settled smoothly.

In addition, since only the scraper can be raised and lowered by using the support as a bendable wire, there is an advantage that the scraper can be maintained and repaired without discharging the treated water in the settling tank.

On the other hand, even if it is an effect not explicitly mentioned herein, it is added that the effects described in the following specification expected by the technical features of the present invention and their potential effects are treated as described in the specification of the present invention.

1 is a view for explaining an activated sludge method among the water treatment methods.
2 is a photograph taken of a conventional sludge collector that is actually installed in the sewage sludge settling tank.
3 is a schematic perspective view of a state in which the sludge collecting device according to an embodiment of the present invention is installed in the settling tank.
4 is a schematic cross-sectional view taken along line AA of the scraper of the sludge collecting device shown in FIG. 3 .
5 is for explaining a sludge collecting device in which a plurality of scrapers are installed.
6 is a partially cut schematic perspective view for explaining the elevating structure of the scraper.
7 is a schematic perspective view of a state in which the sludge collecting device according to another example of the present invention is installed in the settling tank.
※ It is revealed that the accompanying drawings are exemplified as a reference for understanding the technical idea of the present invention, and the scope of the present invention is not limited thereby.

Hereinafter, with reference to the accompanying drawings, a sludge collecting device according to an embodiment of the present invention will be described in more detail.

However, in the description of the present invention, if it is determined that the subject matter of the present invention may be unnecessarily obscured as it is obvious to those skilled in the art with respect to related known functions, the detailed description will be omitted.

[0001] The present invention relates to a sludge collecting device for collecting and discharging sludge in one place after precipitating sludge from treated water.

Although the present invention is mainly used in a sewage treatment plant, it is clarified in advance that it can be used in any facility including a process for precipitating sludge, including a water treatment plant and a wastewater treatment plant.

3 is a schematic perspective view of a state in which the sludge collecting device according to an embodiment of the present invention is installed in the settling tank, and FIG. 4 is a schematic cross-sectional view taken along line A-A of the scraper of the sludge collecting device shown in FIG. 3 .

3 and 4 , the sludge collecting device 100 according to an embodiment of the present invention is installed in the settling tank 1 or the thickening tank. The settling tank 1 is generally formed in a circular shape, and treated water is accommodated therein for a predetermined time. Sludge is settling from the treated water during this set time. The settling time of the sludge varies greatly depending on the particle size of the sludge. For example, in the case of the present invention, it is mainly suitable for applying to a sedimentation tank for precipitating sludge having a particle size of about 0.1 to 0.01 mm, and sludge of a size of 0.1 mm takes about 38 seconds to settle, and in the case of a size of 0.01 mm It is known that it takes about 33 minutes. However, if there is turbulence or fluctuations in the treated water accommodated in the settling tank, the settling time is increased. For reference, a plurality of settling tanks are continuously arranged so that they are separately settling for each particle size of the sludge.

A penetrating part 2 is formed in the center of the lower part of the settling tank 1 . The penetrating part 2 is connected to a discharge pipe (not shown) as a passage for discharging the collected sludge. A pump (not shown) is installed in the discharge pipe to promote the discharge of the sludge. All of the sludge deposited on the bottom of the sedimentation tank 1 is collected and discharged to the penetration part 2 by a sludge collecting device to be described later.

The sludge collection device 100 according to an example of the present invention includes a tower 10 . The tower 10 is rotatably installed in the central part of the settling tank 1, in this example, the penetration part 2. The tower 10 is connected to a driving means such as a hydraulic motor (not shown) and rotates in place.

An annular mounting portion 20 is installed on the upper portion of the tower 10 to surround the tower. The mounting part 20 is a structure for supporting the connection bar 30 to be described later, and may be a part of the tower or may be installed separately.

The connecting bar 30 is a structure disposed long from the center of the settling tank 1 to the outer wall, and one end is coupled to the tower 10 or the mounting unit 30 , and the other end is supported on the upper surface of the outer wall of the settling tank 1 . When the tower 10 is rotated, the connecting bar 30 is also rotated. In order to facilitate the rotation, a wheel 32 is mounted on the lower side of the other end of the connecting bar 30, and on the upper surface of the outer wall of the settling tank 10 A groove or guide rail 3 is installed, so that the wheel 32 of the connecting bar 30 is mounted on the guide rail 3 and can be rotated along the guide rail 3 . In addition, the connection bar 30 may be provided with a passage part 31 through which the operator can go.

The tower 10, the mounting unit 20, and the connecting bar 30 described above are applied to the existing sludge collection device, are already known, and various types of modifications are possible. Accordingly, further detailed description will be omitted.

In the present invention, the configuration of the scraper and the support to be described below is a feature that is different from the prior art. This will be described in detail.

A scraper 50 is installed at the bottom of the settling tank 1 . The scraper 50 is for collecting the sludge settling on the bottom by sweeping while rotating the bottom surface of the settling tank 1 through the penetrating part 2 . In this example, the scraper 50 is made of a spiral (spiral type), and even sludge placed on the edge of the bottom surface of the settling tank 1 moves toward the through part 2 in the process of being swept away by the scraper 50 . will do

Although only one scraper 50 may be disposed as shown in this embodiment, that is, FIG. 5(A), as shown in FIG. 5(B), two scrapers 81 and 82 are installed, As shown in (C), three scrapers (83, 84, 85) of scrapers may be installed. The scraper 50 is connected to the connecting bar 30 by the support 40 , and receives the rotational force of the tower 10 .

The scraper is mainly manufactured from a metal plate, and in the prior art, there was a difficulty in manufacturing the spiral scraper because the scraper was integrally processed. In the present invention, the scraper 50 is formed in a spiral, but it is manufactured by combining a plurality of segments 51 as shown in FIG. Since the segment 51 is formed in a straight line, it is possible to use an existing ready-made product, so that it is economical as well as simple assembling compared to manufacturing a spiral product integrally. If the number of segments is increased, a more perfect curve can be made, but as long as the scraper is spirally formed as a whole, there is no problem in collecting the sludge into the penetrating part 2 in the center of the settling tank 1, so it is not necessary to implement a smooth curve. .

In addition, as shown in Figure 4, in this embodiment, the buoyancy body 55 is coupled to the upper portion of the scraper 50. The buoyancy body 55 is made of a density lighter than water, and applies a buoyancy force in the direction of levitating the scraper 50 upward. Although the configuration of the buoyancy body 55 is varied, as shown in FIG. 4 , in this example, a hollow pipe having an empty interior and both ends blocked may be mainly used. As will be described later, the scraper 50 is supported by the connecting bar 30 by the support 40. If the scraper 50 is heavy, the number of the supporters 40 should also increase. As in this example, the buoyancy force on the scraper 50 When the sieve is combined, the overall weight of the scraper is reduced, so there is an advantage that the number of supports can be reduced.

And a brush 56 made of a flexible material that can be bent, for example, a rubber material is coupled to the lower side of the scraper 50 . The brush 56 directly contacts the bottom surface of the settling tank 1 to move the sludge toward the penetrating part 2 .

In addition, it can help to maintain a constant height by preventing the scraper from sagging by maintaining the balance of the overall structure by attaching wheels, etc. to aid in rotational mobility in the middle of the lower end of the scraper 50 and to distribute the force. At this time, in principle, auxiliary materials such as wheels should be placed so that they do not protrude from the front of the brush.

The scraper 50 is supported by the support 40 . The support 40 interconnects the connecting bar 30 and the scraper 50 to transmit force so that the scraper 50 rotates together when the connecting bar 30 rotates. In the present invention, the support 40 is made of a bendable wire material. In the past, there were many cases of using a truss structure due to the weight of the scraper. A truss is a structure in which a number of steel materials are connected in a triangular shape, and has high strength and supports loads well. However, a number of steel materials are connected to the truss, and since these steel materials cross the treated water while rotating in the settling tank 1, there is a problem of causing turbulence in the treated water. When turbulence occurs, the sedimentation time of the sludge in the treated water is delayed, which inevitably lowers the process efficiency.

Accordingly, the present invention not only reduces the number of supports 40 but also solves the problem of turbulence in the treated water due to the support by using a very thin wire. The reason why the number of supports is reduced and a thin wire can be used is that the strength of the force required to support and tow the scraper 50 is reduced due to the buoyancy body 55 . In addition, in the present invention, since a thin wire having a thickness of about 1 to 3 mm is used as a support, there is an advantage in that the possibility of generating turbulence in the treated water is significantly reduced compared to the case of using a steel material even if the number is large.

On the other hand, in the present invention, the scraper 50 is characterized in that it can be lifted. In the existing sludge collecting device, the scraper 50 is disposed on the bottom of the settling tank 1 and does not move in the vertical direction. Therefore, in order to replace parts of the scraper, or to maintain and manage such as washing, work should be carried out in a state in which all of the treated water in the settling tank 1 is discharged. A plurality of facilities are provided in the water treatment system, and a continuous process is performed through the plurality of facilities, but there is a problem that the process of the entire system must be stopped when operation is stopped at any one facility (sedimentation tank). Accordingly, in an example of the present invention, the structure is improved so that the scraper 50 can be raised while the treated water is accommodated in the settling tank 1 as it is.

Referring to FIG. 6 , a guard rail 70 is installed on the outer circumferential surface of the tower along the height direction. And one end of the scraper 50 is fitted to the guard rail 70 . A means for elevating the scraper 50, for example, a hydraulic cylinder, etc. may be separately installed in the settling tank, but the scraper may be elevated using a crane (not shown) if necessary even if it is not separately installed. The scraper 50 is formed with a connection hole 57 to which the tow line of the crane can be connected. In addition to connecting the tow line of the crane to the connecting hole, in the present invention, the wire support 40 may be used as the tow line of the crane. In the present invention, since a bendable wire is used as a support, if it is connected to a crane by untying what is tied to the upper end of the wire, that is, the connection bar 30, it is effective because the support can be utilized as a traction line of the crane.

In addition, a stopper (not shown) for adjusting the descending height may be installed at the lower end of the guard rail 70 to prevent a strong collision with the bottom of the settling tank when the scraper that has been raised is lowered. That is, by forming a locking jaw at a certain height of the lower part of the guardrail, it is possible to prevent the scraper from falling any further because the scraper fitted to the guardrail is caught.

Conventionally, since the scraper used a truss made of steel as a support, only the scraper could not be lifted. However, in the present invention, since a flexible wire that can be bent is used as the support 40 , when the crane lifts the scraper 50 , the wire is bent together so that the scraper can be lifted up and down. When the crane vertically raises the scraper 50 , the scraper 50 can ascend along the guard rail 70 installed in the tower 10 . The guard rail 70 serves to hold the direction when the scraper 50 is ascending and descending, and also serves to primarily transmit the rotational force to the scraper 50 when the tower 10 rotates. In this example, the rotational force of the tower 10 is transmitted to the scraper 50 through the connecting bar 30 and the support 40 , but when one end of the scraper 50 is inserted into the guard rail 70 , the rotational force of the tower This can be directly transferred to the scraper 50 .

For reference, in this example, the rotational force transmission by the guard rail 70 is an incidental force transmission structure, but in another example, the center and upper end of the guard rail are left as they were, but the lower end of the guard rail is the radial direction of the settling tank 1 . By installing a little longer along, the scraper fitted to the lower end of the guard rail may be able to receive all the rotational force of the tower without a support.

As described above, the sludge collecting device according to the present invention has the advantage that economical and simple manufacturing is possible by welding a plurality of straight segments to each other, rather than manufacturing a spiral scraper integrally as in the prior art.

In addition, in the present invention, the effect of lowering the overall weight of the scraper was expressed by installing a buoyancy body on the scraper. Through this, a thin wire can be used as a support instead of a truss structure using a plurality of steel materials as in the prior art, and it is possible to prevent disturbance of the treated water in the settling tank or the occurrence of turbulence by the support. Since there is no turbulence or disturbance in the treated water, the sludge can be settled smoothly.

In addition, since only the scraper can be raised and lowered by using the support as a bendable wire, there is an advantage that the scraper can be maintained and repaired without discharging the treated water in the settling tank.

Meanwhile, up to now, the support has been described and illustrated as being connected to the connecting bar 30 . However, in another example of the present invention shown in FIG. 7 , the support 40 may be connected to the tower 10 or the mounting portion 20 rather than being connected to the connecting bar. Referring to FIG. 7 , a mount may be installed on the mounting unit 20 or the tower 10 , and the wire 40 may be connected to the mount. In this case, the connecting bar does not act to move the scraper.

The protection scope of the present invention is not limited to the description and expression of the embodiments explicitly described above. In addition, it is added once again that the protection scope of the present invention cannot be limited due to obvious changes or substitutions in the technical field to which the present invention pertains.

10 ... towers, 20 ... mounting parts
30 ... connecting bar, 40 ... support
50 ... scraper, 51 ... scraper segment
55 ... buoyant bodies, 56 ... brushes
70 ... guardrail

Claims (9)

a tower rotatably installed in a settling tank in which treated water is accommodated;
a connecting bar disposed along the radial direction of the settling tank and having one end fixed to the tower;
a scraper rotatably installed on the bottom surface of the settling tank to sweep the sludge deposited on the bottom of the settling tank and guide it to the penetrating part; and
The lower end is coupled to the scraper and the upper end is coupled to the connecting bar to transmit the rotational force of the tower to the scraper; and
The scraper is formed in a curved shape, and a sludge collecting device, characterized in that it is assembled by interconnecting a plurality of segments. According to claim 1,
Sludge collection device, characterized in that the buoyancy body having a density lighter than water is attached to the scraper. 3. The method of claim 2,
The buoyancy body has a curved shape corresponding to the shape of the scraper, and is a sludge collecting device, characterized in that it is a hollow pipe with both ends blocked. According to claim 1,
The support is a sludge collection device, characterized in that the wire of a bendable material. According to claim 1,
The scraper is a sludge collecting device, characterized in that it can be lifted up and down in the vertical direction. 6. The method of claim 5,
One end of the scraper is slidably coupled to the tower in the vertical direction,
The support for interconnecting the scraper and the connecting bar is a sludge collecting device, characterized in that it is a wire of a bendable material. 7. The method of claim 6,
Sludge collecting device, characterized in that by loosening the upper end of the wire connected to the connection bar and connecting to a crane to elevate the scraper. According to claim 1,
A sludge collecting device, characterized in that a rubber brush is attached to the lower end of the scraper. a tower rotatably installed in a settling tank in which treated water is accommodated;
a scraper rotatably installed on the bottom surface of the settling tank to sweep the sludge deposited on the bottom of the settling tank and guide it to the penetrating part; and
The lower end is coupled to the scraper and the upper end is coupled to the tower to transmit the rotational force of the tower to the scraper; and
The scraper is formed in a curved shape, and a sludge collecting device, characterized in that it is assembled by interconnecting a plurality of segments.

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