CN215559136U

CN215559136U - Air floatation device

Info

Publication number: CN215559136U
Application number: CN202122513614.8U
Authority: CN
Inventors: 刘代传; 张敏; 玄小立
Original assignee: Suez Water Treatment Co Ltd
Current assignee: Suez Environmental Technology Beijing Co Ltd
Priority date: 2021-10-19
Filing date: 2021-10-19
Publication date: 2022-01-18
Anticipated expiration: 2031-10-19

Abstract

The present disclosure provides an air flotation device for water treatment, the air flotation device comprising: the flotation tank is used for providing bubbles for the water to be treated so as to enable suspended matters in the water to be treated to rise to the liquid level of the water to be treated; a clean water tank located downstream of the flotation tank in a flow direction of the water to be treated; the clean water collecting device is arranged in the flotation tank and is communicated with the clean water tank so as to discharge the clean water generated after treatment to the clean water tank; and the sediment discharge device is arranged in the flotation tank and positioned below the clear water collection device so as to discharge the sediment in the water to be treated out of the air floatation device.

Description

Air floatation device

Technical Field

The present disclosure relates to an air flotation device.

Background

The solid-liquid separation technology is a common treatment means in the field of water treatment, and the air floatation device is a common treatment device in the solid-liquid separation technology. The air floatation device adopts an air floatation process, and by forcibly releasing bubbles into the sewage, highly dispersed micro bubbles in an air floatation area are attached to the surface of suspended matters in the sewage to be treated and are gathered to form alum flocs, so that the density of the alum flocs is smaller than that of the sewage, the alum flocs can quickly float to the water surface to form scum, the scum is removed by a hydraulic or mechanical method, and clear water is discharged from the bottom, thereby realizing solid-liquid separation. In the field of water treatment, compared with the conventional precipitation treatment process, the air floatation process has the advantages that the solid-liquid separation speed is much higher, and the tank capacity and the occupied area of an air floatation device are smaller, so that the air floatation process has special advantages in the aspect of solid-liquid separation.

For the clean water produced by the air flotation device, the conventional collection method is shown in fig. 1 and 2. Fig. 1 shows a conventional air flotation device, which comprises a flotation zone in the middle and occupying a larger part of the tank body and a clear water zone on the right side of the figure, the water flow direction being indicated by arrows. However, no special clear water collecting device is arranged in the device, and clear water generated after treatment flows to a clear water area only through hydraulic power self-flow. In the device shown in fig. 1, the phenomenon of short flow and turbulent flow of water easily occurs in the flotation zone, so that the flotation effect is influenced, and the quality of the outlet water of the air flotation device is poor. Fig. 2 shows another conventional air flotation device, which is provided with a perforated water collecting plate, wherein the size and the number of holes are configured according to the distance from the inlet of the flotation zone, so as to achieve the purpose of uniformly collecting water. As shown in fig. 2, the perforated water receiving plate is located in the lower part of the flotation zone as shown by the dotted line in the figure. The situation of rivers short current can be avoided to a certain extent in this kind of device of fig. 2, but the relatively poor deposit that causes flotation zone of quality of water of intaking is more or because the use of long-term accumulation, the easy mud layer that accumulates on the board is received in the perforation, or the punchhole that receives on the board blocks up, influences air supporting play water quality of water, probably needs to punch the washing that receives the board through shutting down.

In addition, due to the difference of the quality of the treated water and the front-end process of the air flotation device, part of suspended matters (such as silt and the like) with higher density in the flotation zone of the air flotation device is difficult to float and is precipitated to the bottom of the flotation zone. After the air floatation device is used for a long time, the sediments are easy to influence the effluent quality. A common treatment for sediment is shown in fig. 3, where the bottom plate of the flotation zone is designed with a gradient and the flotation device comprises a sludge collection pit for collecting and discharging the bottom sludge. However, the slope of the floor of such a device as shown in fig. 3 is generally designed to be small, so that the collection and discharge of sediment is less effective, especially if the length of the flotation zone is long.

At present, no technology can solve the problems of clear water collection and sediment discharge.

SUMMERY OF THE UTILITY MODEL

Therefore, it is an object of the present disclosure to provide an air flotation device capable of solving the above problems, which can reduce the occurrence of short flow and turbulent flow caused by uneven flow of water, and has improved clean water collection effect and sediment collection and discharge effect.

The present disclosure relates to an air flotation device for water treatment. The air floatation device comprises: the flotation tank is used for providing bubbles for the water to be treated so as to enable suspended matters in the water to be treated to rise to the liquid level of the water to be treated; a clean water tank located downstream of the flotation tank in a flow direction of the water to be treated; the clean water collecting device is arranged in the flotation tank and is communicated with the clean water tank so as to discharge the clean water generated after treatment to the clean water tank; and the sediment discharge device is arranged in the flotation tank and positioned below the clear water collection device so as to discharge the sediment in the water to be treated out of the air floatation device.

According to an embodiment, the clean water collecting device comprises perforated pipes, wherein each of the perforated pipes is arranged along the length of the flotation basin, is provided with a plurality of holes for the water to be treated to flow through and has a pipe outlet communicating to the clean water basin.

According to an embodiment, the perforated pipe comprises a plurality of perforated pipes arranged evenly along the width direction of the flotation tank.

According to an embodiment, the inner diameter of the pipe of each of the perforated pipes is gradually or stepwise larger along the length of the flotation tank.

According to one embodiment, the holes in each of said perforated tubes are staggered along the tangent lines of both sides of the perforated tube.

According to an embodiment, the density of the holes on each of the perforated pipes is gradually or stepwise reduced along the length of the flotation cell.

According to an embodiment, the diameter of the holes in each of the perforated pipes is tapered or stepwise tapered along the length of the flotation cell.

According to an embodiment, each of the perforated pipes has at least one section, which are arranged in sequence along the length of the flotation cell and are concentric to each other.

According to an embodiment, the flow rate of each of said perforated pipes is 50m³H to 200m³/h。

According to an embodiment, the fresh water collection device further comprises a plurality of fixation members for preventing movement of the perforated tube relative to the flotation tank.

According to an embodiment, the fresh water collection device further comprises a support for supporting the perforated tube.

According to an embodiment, the fresh water collecting device further comprises a plurality of first fasteners for fixing the plurality of fixing members to the support member.

According to an embodiment, the fresh water collecting device further comprises a plurality of second fasteners for fixing the support to the bottom of the flotation tank.

According to one embodiment, the sediment discharge device is located at the bottom of the flotation tank and comprises a plurality of collection pits, a plurality of discharge pipes and a plurality of control valves, wherein the sediment generated by the treatment is collected in the collection pits and can be discharged to the outside of the flotation device through the discharge pipes, and the control valves are used for controlling the start and stop of the discharge.

According to an embodiment, each of said plurality of collecting pits is assigned a respective discharge conduit and control valve.

According to an embodiment, one of the collection pits is divergent in the height direction of the flotation tank, and the side wall of the one of the collection pits forms an angle of 45 ° or more with the height direction of the flotation tank.

According to an embodiment, the discharge conduit is arranged inclined with respect to the level of the water to be treated.

According to an embodiment, the plurality of collecting pits are evenly distributed along the length direction of the flotation tank at the bottom of the flotation tank.

According to an embodiment, the flotation tank and the clean water tank are located in the same tank body and are separated through a retaining wall, and the perforated pipe penetrates through the retaining wall and extends into the clean water tank.

Drawings

Advantages and objects of the present disclosure may be better understood from the following detailed description of preferred embodiments of the disclosure taken in conjunction with the accompanying drawings. The drawings are not necessarily to scale, emphasis instead being placed upon illustrating the relationship of the various components. In the drawings:

FIG. 1 illustrates a schematic view of a conventional air flotation device;

FIG. 2 illustrates a schematic view of another conventional air bearing apparatus;

FIG. 3 illustrates a schematic view of yet another conventional air bearing apparatus;

FIG. 4 illustrates a schematic cross-sectional view of an air floatation device according to one embodiment of the present disclosure;

FIG. 5 illustrates a top view of an air floatation device according to one embodiment of the present disclosure;

FIG. 6 illustrates a top view of a sediment discharge apparatus of an air flotation device according to one embodiment of the present disclosure;

fig. 7 shows a cross-sectional view of a sediment discharge of an air flotation device according to an embodiment of the disclosure in a plane in which the width direction and the height direction of the flotation tank lie;

FIG. 8 shows a schematic view of the fixture for the perforated tube of the fresh water collection device of the air flotation device according to one embodiment of the present disclosure, with the left side showing a front view of the fixture and the right side showing a side view of the fixture; and

FIG. 9 shows a schematic view of a support, a first fastener and a second fastener of a perforated tube for a fresh water collection device of an air flotation device according to one embodiment of the present disclosure, with the left side showing a front view and the right side showing a side view.

Detailed Description

Various embodiments according to the present disclosure will be described in detail with reference to the accompanying drawings. Here, it is to be noted that, in the drawings, the same reference numerals are given to constituent parts having substantially the same or similar structures and functions, and repeated description thereof will be omitted. The descriptions of "first", "second", and variations thereof herein are merely for distinguishing between various components and do not limit the scope of the present disclosure, and "first" may be written as "second" or the like without departing from the scope of the present disclosure, if not specifically stated. The term "sequentially comprising A, B, C, etc" merely indicates the order of the included elements A, B, C, etc. and does not exclude the possibility of including other elements between a and B and/or between B and C. Further, the terms "length direction", "width direction", "height direction", "flow direction" and the like herein are described with respect to the drawings of the present invention.

The drawings in the present specification are schematic views to assist in explaining the concept of the present disclosure, and schematically show the shapes of respective portions and their interrelationships.

Hereinafter, preferred embodiments according to the present disclosure are described in detail with reference to fig. 4 to 9.

As shown in fig. 4, the air flotation device for water treatment according to one embodiment of the present disclosure includes at least a flotation tank 1, a clean water tank 2, a clean water collection device 3, and a sediment discharge device 4. The blank part formed by the curved line in fig. 4 indicates that the middle part of the flotation cell is omitted, since the flotation cell is larger. The flotation tank 1 can provide bubbles to the water to be treated to make suspended matters in the water to be treated rise to the liquid level of the water to be treated, that is, the flotation process is mainly performed in the flotation tank 1. The clean water basin 2 is located downstream of the flotation basin 1 in the flow direction of the water to be treated, for example on the rightmost side in fig. 4. The flow direction of the water to be treated is substantially from left to right as indicated by the arrows in fig. 4. The clean water collecting device 3 is arranged in the flotation tank 1 and is communicated with the clean water tank 2 so as to discharge the clean water generated after treatment to the clean water tank 2. The sediment discharge device 4 is arranged in the flotation tank 1 and below the clear water collection device 3 so as to discharge sediment in the water to be treated out of the flotation device. As shown in fig. 4, the flotation tank 1 and the clean water tank 2 can be located in the same tank and separated by a retaining wall 5, and the clean water collecting device 3 can extend through the retaining wall 5 into the clean water tank 2 and have an outlet connected to the clean water tank 2. Of course, the present disclosure also covers the case where the flotation tank 1 and the clean water tank 2 are not located in the same tank body, and at this time, the clean water generated after the treatment may be discharged to the clean water tank 2 through an additional pipe. Furthermore, the air flotation device may also comprise means for guiding the water to be treated into the flotation tank 1, such as a water pump, a water guiding structure or the like.

As shown in fig. 4 and 5, the fresh water collecting device 3 comprises a plurality of perforated pipes 6. In other examples, the fresh water collection device 3 may comprise only one perforated tube 6. Each of the plurality of perforated pipes 6 is arranged along the length of the flotation cell. It is considered that the longitudinal direction of the flotation cell is the horizontal right direction in fig. 4 and 5, roughly coinciding with the flow direction of the water to be treated, while the height direction of the flotation cell is the vertical upward direction in fig. 4 and the width direction of the flotation cell is the vertical upward direction in fig. 5. Each of the plurality of perforated pipes 6 is provided with a plurality of holes 8 for the water to be treated to flow through and has a pipe outlet 7 communicating to the clean water tank 2. The holes 8 prevent dense suspensions from entering the perforated pipe and thus into the clean water basin 2.

For example, in the case where the flotation tank 1 and the clean water tank 2 are located in the same tank and are separated by a retaining wall 5, the perforated pipes 6 extend through the retaining wall 5 into the clean water tank 2, and as shown in fig. 4, the pipe outlets 7 of the perforated pipes 6 open into the clean water tank 2.

Referring again to FIG. 5, consider a sheetThe output of the group or single perforated pipe and the type of the flotation tank of the air flotation device are provided, and a plurality of perforated pipes are uniformly arranged along the width direction of the flotation tank. The width direction of the flotation cell is perpendicular to its length direction, which is the vertical upward direction in fig. 5. By uniform arrangement, e.g. 50m for each of a plurality of perforated tubes³H to 200m³H is used as the reference value. Of course, the present disclosure is not so limited and other ranges of values of output may be devised depending on the particular design requirements and application scenarios.

For example, the perforated tube may be made of at least one of the following materials: glass reinforced plastic, metal, and the like.

In addition, depending on the pressure requirements and the perforated pipe material, the thickness of the perforated pipe can be selected to meet the specification requirements of a particular application. In practical cases, the bearing pressure is usually required to be less than or equal to 0.1 MPa.

As shown in fig. 5, the holes 8 of each perforated tube 6 are staggered along the tangent lines of both sides of the perforated tube. The tangent is for example a black straight contour line representing a perforated pipe as shown in fig. 5 extending along the length of the flotation cell. Through this kind of mode of setting up, not only can effectively reduce the flotation tank in the sediment drop to the inside probability of perforated pipe, can weaken the mutual interference that produces when rivers flow through both sides hole moreover. Furthermore, the density of the holes 8 in each perforated tube 6 is gradually or stepwise reduced along the length of the flotation cell. Further, the diameter of the holes 8 in each perforated tube 6 is gradually or stepwise smaller along the length of the flotation cell. Therefore, the occurrence probability of turbulent flow in the flotation cell caused by uneven flow velocity of water flow can be reduced.

Although not shown in the figure, in order to further avoid the occurrence of short flow and turbulence, the inner diameter of the pipe of each perforated pipe 6 is gradually increased or increased in stages along the length direction of the flotation tank.

As shown in fig. 4 and 5, each of the plurality of perforated pipes 6 may be of a segmented design to minimize the possibility of turbulence in the flotation cell 1 caused by non-uniform flow rates of the water to be treated. For example, each of the plurality of perforated tubes 6 has at least a first tube section 61 and a second tube section 62 arranged in sequence along the length of the flotation cell and concentric to each other. In other examples, each of the plurality of perforated tubes 6 also has a third tube section (not shown in the figures) located downstream of the second tube section 62 along the length of the flotation cell, which is arranged concentrically with the first and second tube sections. The sectional design is based on the distance from the outlet end of the flotation cell 1, i.e. the right-hand end in fig. 5. In case the length of the flotation cell 1 is longer, more sections of perforated pipe can be designed. In case the length of the flotation cell 1 is small, the perforated pipe may be configured with only one section. For example, the plurality of segments may be integrally formed. Alternatively, the perforated tube may be realized by assembling a plurality of tubes.

For example, the first pipe section 61 may have a pipe inner diameter that is smaller than the pipe inner diameter of the second pipe section 62. Further, as shown in fig. 5, the holes 8 of the first pipe section 61 may be staggered along both tangential lines of the first pipe section 61, and the holes 8 of the second pipe section 62 may be staggered along both tangential lines of the second pipe section 62. As shown in fig. 4 and 5, the density of holes 8 on the first tube section 61 may be greater than the density of holes 8 on the second tube section 62. Further, the diameter of the hole 8 on the first tube section 61 may be larger than the diameter of the hole 8 on the second tube section 62. For example, the diameter of the hole 8 is usually 15mm to 45 mm. The above dimensional relationships also apply to the case of three tube sections.

Referring again to fig. 4 and 5, the fresh water collecting device 3 further comprises a plurality of fixing members 9 for preventing movement of the perforated pipe 6 relative to the flotation tank 1. For example, the fixing member 9 is a pipe clamp which prevents the perforated pipe 6 from rotating. As shown in fig. 8, the fixing member 9 has a circular body which is fitted around the outside of the perforated pipe 6. As shown in fig. 5, two fastening elements 9 can be provided for each perforated pipe 6, i.e. one fastening element 9 is assigned to each of the first and

second pipe sections

61, 62, the fastening elements assigned to the two pipe sections can have different dimensions. In the case of a perforated tube 6 having only one section, a fastening element 9 can also be provided for a perforated tube 6.

As shown in fig. 4 and 5, the fresh water collecting device 3 further comprises a support 10 for supporting the perforated pipe 6. As shown in fig. 4, the support 10 is, for example, a bracket arranged at the bottom of the flotation cell. By providing the support member it is ensured that the perforated tube 6 is kept in a horizontal orientation within the flotation cell.

As shown in fig. 8 and 9, the fresh water collecting device 3 further comprises a plurality of first fastening members 11 for fixing the plurality of fastening members 9 to the support member 10. Thereby, the support of the perforated pipe by the support member can be realized. Of course, the present disclosure also includes the solution of fixing the perforated tube 6 directly to the support 10. For example, the first fastening member 11 may be a screw or a bolt, etc.

As shown in fig. 9, the fresh water collecting device 3 further comprises a plurality of second fastening members 12 for fastening the support member 10 to the bottom of the flotation cell.

As shown in fig. 4 and 6, the sediment discharge 4 is located at the bottom of the flotation tank 1 and comprises a number of collecting pits 13, a number of discharge pipes 14 and a number of control valves 15. The precipitates, such as sludge, produced by the treatment are collected in the collection pit 13 and can be discharged to the outside of the flotation device through the discharge pipe 14. The control valve 15 is used to control the start and stop of the discharge. As shown in fig. 6, each collecting pit 13 is assigned a respective discharge line 14 and control valve 15, for example a discharge line 14 and a control valve 15.

For example, the discharge conduit 14 may be made of at least one of the following materials: glass reinforced plastic, metal, and the like. Further, the discharge pipe 14 may have a pipe inner diameter equal to or greater than DN 100. For example, as shown in fig. 7, the discharge pipe 14 is disposed obliquely, i.e., with a certain slope, with respect to the surface of the water to be treated, so as to facilitate sludge discharge. For example, the slope of the discharge duct 14 is set to 1% or more.

For example, the control valve 15 may be made of at least one of the following materials: plastic, metal, etc. The material of the control valve can be selected according to different practical application environments. For example, the control valve 15 may be operated manually or automatically, etc., depending on the actual operating requirements.

As shown in fig. 7, one of the collection pits 13 is divergent in the height direction of the flotation cell, i.e. in the direction vertically upwards in fig. 7, for example with a conical cross-section. The angle formed by the side walls of the collecting pit 13 and the height direction of the flotation cell is an acute angle, for example 45 ° or more. As shown in fig. 7, the pipe inlet of the discharge pipe 14 is provided at the bottom of the collection pit 13. With the sloping side walls of the collection pit, the sediment can be collected under gravity into the discharge pipe 14. As shown in the top view of fig. 6, the collection pit 13 may have a rectangular cross-section, i.e. the collection pit 13 has a rectangular cross-section in the plane of the length direction and the width direction of the flotation cell in fig. 4. However, the present disclosure is not limited thereto, and the collecting pit 13 may have a cross section of other shapes such as a circle. As shown in fig. 4 and 6, a plurality of collecting pits 13 may be evenly distributed along the length of the flotation cell at the bottom of the flotation cell. The collection pit 13 is formed of concrete, for example. Furthermore, the number and volume of the collecting pits 13 depend on the actual water quality and the type of flotation basin.

For example, the collecting pit 13 may extend in the width direction of the flotation cell to have the same width as the width of the flotation cell. That is, only one collection pit is provided along the width direction of the flotation cell. Of course, the width of the flotation cell may be a multiple of the width of the collection pit, or a plurality of collection pits may be provided along the width direction of the flotation cell.

For example, as shown in fig. 4 and 6, a flat portion is provided between adjacent two of the collection pits 13. The second fastener 12 may fix the support 10 to the flat portion, as shown in fig. 4.

Furthermore, in other examples, instead of the evenly distributed collection pit 13 described above, the sediment discharge means may comprise a mud scraper, which is arranged below the fresh water collection means 3. For example, the scrapers scrape the sediment in a direction opposite to the length direction of the flotation cell into a collection pit located at the water inlet end of the flotation cell 1. In such an embodiment, the support 10 may be fixed to the side walls and bottom of the flotation cell 1.

The sediment discharge device can effectively clean the bottom sediment in the flotation tank, and the influence of the bottom sediment on the water quality of the effluent of the air floatation device is avoided.

Through the combination that sets up clear water collection device and precipitate discharging equipment, this disclosure can reduce the incidence of the short stream that rivers inequality caused, the turbulent condition, can also clear up the precipitate effectively, consequently can enough solve the clear water collection problem in flotation cell effectively, especially receive water homogeneity problem, can solve the discharge problem of precipitate in the flotation cell effectively again.

Moreover, the technical features disclosed above are not limited to the combinations with other features disclosed, and other combinations between the technical features can be performed by those skilled in the art according to the disclosure, so as to achieve the purpose of the disclosure.

Claims

1. An air flotation device for water treatment, characterized in that it comprises:

the flotation tank is used for providing bubbles for the water to be treated so as to enable suspended matters in the water to be treated to rise to the liquid level of the water to be treated;

a clean water tank located downstream of the flotation tank in a flow direction of the water to be treated;

the clean water collecting device is arranged in the flotation tank and is communicated with the clean water tank so as to discharge the clean water generated after treatment to the clean water tank; and

and the sediment discharge device is arranged in the flotation tank and positioned below the clear water collection device so as to discharge the sediment in the water to be treated out of the air floatation device.

2. The air flotation device according to claim 1, wherein the clean water collection device comprises perforated tubes, wherein each of the perforated tubes is arranged along the length of the flotation tank, is provided with a plurality of holes for the water to be treated to flow through, and has a pipe outlet communicating to the clean water tank.

3. The air flotation device of claim 2, wherein the perforated tube comprises a plurality of perforated tubes uniformly arranged along a width direction of the flotation tank.

4. The air flotation device of claim 2, wherein the inner diameter of the tube of each of the perforated tubes is progressively larger or stepwise larger along the length of the flotation tank.

5. The air flotation device of claim 2, wherein the holes in each of the perforated tubes are staggered along a tangent line on both sides of the perforated tube.

6. The air flotation device of claim 5, wherein the density of holes on each of the perforated tubes is tapered or segmented along the length of the flotation tank.

7. The air flotation device of claim 5, wherein the diameter of the holes in each of the perforated tubes is tapered or stepped along the length of the flotation cell.

8. The air flotation device according to claim 2, wherein each of the perforated tubes has at least one section, the at least one sections being sequentially disposed along a length of the flotation cell and concentric with each other.

9. The air flotation device of claim 3, wherein each of the perforated tubes has a flow rate of 50m³H to 200m³/h。

10. The air flotation device as claimed in claim 2, wherein the fresh water collection device further comprises a plurality of fasteners for preventing movement of the perforated tube relative to the flotation tank.

11. The air flotation device as recited in claim 10, wherein the clean water collection device further comprises a support for supporting the perforated tube.

12. The air flotation device as recited in claim 11, wherein the fresh water collection device further comprises a first plurality of fasteners for securing the plurality of fasteners to the support member.

13. The air flotation device as claimed in claim 11, wherein the fresh water collection device further comprises a plurality of second fasteners for securing the support to the bottom of the flotation tank.

14. The air flotation device according to claim 1, wherein the sediment discharge device is located at the bottom of the flotation tank and comprises a plurality of collection pits, a plurality of discharge pipes and a plurality of control valves, wherein the sediment generated by the treatment is collected in the collection pits and can be discharged to the outside of the air flotation device through the discharge pipes, and the control valves are used for controlling the start and stop of the discharge.

15. The air flotation device according to claim 14, wherein each of the plurality of collection sumps is assigned a respective discharge conduit and control valve.

16. The air flotation device according to claim 14, wherein one of the collection pits is gradually enlarged in a height direction of the flotation tank, and an angle formed by a side wall of the one of the collection pits and the height direction of the flotation tank is 45 ° or more.

17. The air flotation device as recited in claim 14, wherein the discharge conduit is disposed at an incline relative to a surface of the water to be treated.

18. The air flotation device according to claim 14, wherein the plurality of collection pits are evenly distributed along the length of the flotation tank at the bottom of the flotation tank.

19. The air flotation device according to claim 2, wherein the flotation tank and the clean water tank are located in the same tank body and are separated by a retaining wall, and the perforated pipe passes through the retaining wall and extends into the clean water tank.