KR102638544B1 - Solid-liquid seperator typed of dispersed or cavitational air floatation - Google Patents

Abstract

The present invention has an internal space divided into a raw water inlet space provided to receive raw water containing floc, and a treated water discharge space provided to discharge treated water separated from scum formed by air bubbles attached to the floc. floating tank; and a bubble generating device that generates bubbles to attach to the floc by discharging air into the raw water in the raw water inlet space. It provides a distributed air floating solid-liquid separator including a. Here, the bubble generating device includes a rotating tube that rotatably penetrates the upper surface of the flotation tank from the upper part of the flotation tank and extends to the raw water inflow space, and has a movement path of the air therein; A plurality of coarse air bubble generating wings are fixed to a portion of the rotary tube located in the raw water inlet space and are provided to generate coarse air bubbles by discharging air in the moving path of the rotary tube to raw water when the rotary tube rotates. ; and a pore body for generating fine bubbles, which has an upper end coupled with the lower end of the rotary tube and a lower end coupled with the lower surface of the flotation tank, and is provided to generate fine bubbles by discharging the air introduced from the moving path into raw water. .

Description

Dispersed air floating solid-liquid separator {SOLID-LIQUID SEPERATOR TYPED OF DISPERSED OR CAVITATIONAL AIR FLOATATION}

The present invention relates to a distributed air floating solid-liquid separator, which is a type of floating solid-liquid separator. More specifically, a distributed air floating solid-liquid separator equipped with a bubble generating device capable of generating bubbles of various sizes in raw water containing floc. It relates to a solid-liquid separator.

Sewage discarded from homes or factories is sent to a sewage treatment plant and then treated. The sewage treatment process includes a water purification process and a sludge treatment process. In the water purification process, sewage is purified to the extent that the river's self-purifying effect can be activated and then discharged into public water bodies such as rivers. In the sludge treatment process, sewage is generated during the water purification process. The sludge is treated through processes such as concentration and dewatering.

The above water purification process is generally a physical water purification process to remove solid suspended substances (tree branches, plastic bottles, Styrofoam, etc.) and solid sediments (sand, gravel, metal, etc.), and a chemical/chemical process to remove dissolved substances such as organic matter. Includes biological water purification process. In the chemical/biological water purification process, chemicals are first administered to raw water that has gone through the previous steps to form floc, and then the floc is removed through methods such as precipitation, filtration, and flotation.

A floating solid-liquid separator, a device that removes floc through flotation, generates bubbles in raw water containing floc. Then, the bubbles attach to the floc and form suspended solids, that is, scum, which floats. It is removed from raw water by a scum skimmer. Depending on the method of generating bubbles, these floating solid-liquid separators are divided into Dissolved Air Floatation, Dispersed or Cavitational Air Floatation, Vacuum Floatation, and Electrolytic Floatation. It is classified as follows.

As disclosed in Patent No. 10-0301292 (Sewage and wastewater treatment method and device), the distributed air floating solid-liquid separator includes an air suction pipe and an impeller provided at the bottom of the air suction pipe. The air suction pipe is rotated by a motor, and then external air is sucked into the air suction pipe through the intake holes formed on the upper outer peripheral surface of the air suction pipe. And the impeller is provided with an exhaust pipe, and the air sucked into the air suction pipe is discharged into the raw water through the upper exhaust pipe and becomes fine bubbles.

These dispersed air floating solid-liquid separators include Registration Patent No. 10-0337533 (Fine air generator and induced pneumatic flotation separator using the same) and Patent No. 10-0888691 (Self-priming bubble generator and self-priming pneumatic separator using the same). It is also disclosed in Registered Patent No. 10-1723161 (solid-liquid separation flotation device with self-circulation structure of treated water).

Registered Patent No. 10-0301292 (Sewage and wastewater treatment method and device) Registered Patent No. 10-0337533 (Fine air generating device and induced pneumatic flotation separation device using the same) Registered Patent No. 10-0888691 (Self-priming bubble generator and self-priming pneumatic flotation separation device using the same) Registered Patent No. 10-1723161 (Solid-liquid separation flotation device with self-circulation structure of treated water)

In a floating solid-liquid separator, scum with air bubbles attached to the floc floats. At this time, if the bubbles are larger or smaller than the floc particles, the bubbles do not adhere well to the floc, so the size of the floc particles and the size of the bubbles must be similar. . However, since raw water usually contains floc particles of various sizes, the size of the bubble particles must also be diverse to generate a large amount of scum, which can increase the solid-liquid separation efficiency of the floating solid-liquid separator. This is also true for distributed air floating solid-liquid separators, which are a type of floating solid-liquid separator.

However, in the conventional distributed air floating solid-liquid separators described above, bubbles of various sizes cannot be generated, so there is a limit to improving solid-liquid separation efficiency.

In addition, in the above conventional distributed air floating solid-liquid separators, the intake holes are provided on the upper surface of the rotating air suction pipe and rotate together with the air suction pipe. In this case, the problem is that the amount of air sucked through the intake holes is insufficient. There is, and this problem also acts as an obstacle to improving solid-liquid separation efficiency.

Therefore, the present invention seeks to provide a distributed air floating solid-liquid separator that can generate bubbles of various sizes and increase the amount of air sucked.

The present invention has an internal space divided into a raw water inlet space provided to receive raw water containing floc, and a treated water discharge space provided to discharge treated water separated from scum formed by air bubbles attached to the floc. floating tank; and a bubble generating device that generates bubbles to attach to the floc by discharging air into the raw water in the raw water inlet space. It provides a distributed air floating solid-liquid separator including a. Here, the bubble generating device includes a rotating tube that rotatably penetrates the upper surface of the flotation tank from the upper part of the flotation tank and extends to the raw water inflow space, and has a movement path of the air therein; A plurality of coarse air bubble generating wings are fixed to a portion of the rotary tube located in the raw water inlet space and are provided to generate coarse air bubbles by discharging air in the moving path of the rotary tube to raw water when the rotary tube rotates. ; and a pore body for generating fine bubbles, which has an upper end coupled with the lower end of the rotary tube and a lower end coupled with the lower surface of the flotation tank, and is provided to generate fine bubbles by discharging the air introduced from the moving path into raw water. .

The bubble generating device is rotatably coupled to the upper surface of the rotary tube, is fixed to a support fixed to the upper surface of the flotation tank, has a diameter smaller than the movement path of the rotary tube, and is connected to the outside of the flotation tank and the above. It may include a fixed suction tube having a hollow portion that communicates with the moving path of the rotary tube.

At this time, the pore body for generating fine bubbles has an upper end fixed to the lower end of the rotary tube and a lower end rotatably coupled to the lower surface of the floating tank, and when the rotary tube rotates, the air flowing in from the moving path is used as the raw water. It can be arranged to be discharged to .

The fixed suction pipe may be connected to an air compressor and may be provided to receive air discharged from the air compressor.

In this case, the porous body for generating fine bubbles has an upper end rotatably coupled to the lower end of the rotary tube and a lower end fixed to the lower surface of the floating tank, and the air discharged from the air compressor and then introduced through the moving path It may be arranged to discharge into the raw water.

The bubble generating device is fixed to the lower surface of the rotary tube so as to extend from the outside of the pore body for generating fine bubbles toward the lower surface of the floating tank, and includes a plurality of blades arranged along the circumferential direction of the pore body for generating fine bubbles. It can be included. At this time, the plurality of blades may have a length shorter than the vertical height of the porous body for generating fine bubbles.

A driven pulley is fixed to the portion of the rotating pipe located at the upper part of the floating tank, and the driven pulley is connected to the driving pulley of the motor installed in the floating tank through a power transmission member.

The blade for generating coarse bubbles has an internal space that communicates with the movement path of the rotary tube, and has pores at the tip that communicate with this internal space.

According to the present invention, both coarse and fine bubbles can be generated in raw water, so the solid-liquid separation efficiency is much better than conventional distributed air floating solid-liquid separations.

Additionally, according to the present invention, some of the fine bubbles formed in the raw water are split by the blade and become finer, so even ultra-fine bubbles can be formed in the raw water.

In addition, according to the present invention, unlike the prior art, the rotating tube and the motor are separated, so it is very easy to repair the damaged rotating tube or the motor.

In addition, according to the present invention, the amount of air sucked into the rotating tube increases significantly compared to the prior art, so the amount of bubbles formed in the raw water also increases compared to the prior art, thereby improving the solid-liquid separation efficiency.

Figure 1 shows a distributed air floating solid-liquid separator according to the present invention.
Figure 2 is an enlarged perspective view of portion A of Figure 1.
Figure 3 is an enlarged perspective view of part B of Figure 1.
Figure 4 is a cross-sectional view showing the interior of the porous body for generating fine bubbles shown in Figure 1.

Hereinafter, preferred embodiments of the distributed air floating solid-liquid separator according to the present invention will be described in detail with reference to the drawings. The terms or words used below should not be construed as limited to their usual or dictionary meanings, and based on the principle that an inventor can appropriately define the concept of a term in order to explain his or her invention in the best way, It should be interpreted with meaning and concept consistent with the technical idea of the present invention.

<First Embodiment>

The distributed air floating solid-liquid separator 100 according to the present invention includes a floating tank 110 and a bubble generating device 150, as shown in FIG. 1.

The floating tank 110 has an internal space, and this internal space is divided into a raw water inflow space 112 and a treated water discharge space 114 by a partition wall 113. The raw water inlet space 112 is provided with a raw water inlet 112a, so that raw water containing floc can flow into the raw water inlet space 112. In the treated water discharge space 114, scum (S) floats and is separated from the raw water, and a treated water discharge port (114a) is provided, so that the treated water separated from the scum (S) is discharged from the treated water discharge space 114 to the outside. can be discharged as Meanwhile, the partition wall 113 is provided to extend only to a predetermined height from the lower surface of the floating tank 110, and as a result, the raw water and scum (S) in the raw water inflow space 112 exceed the partition wall 113 and the treated water discharge space. You can go to (114).

A scum skimmer 130 is installed in the floating tank 110 to be located in the upper part of the treated water discharge space 114. The scum skimmer 130 includes a chain 132 and a walking plate 134. The chain 132 is wound around the front and rear sprockets 136 and 138, and the stop plates 134 are arranged at regular intervals along the extension direction of the chain 132 and are fixed to the chain 132. Therefore, when any one of the front and rear sprockets (136, 138) rotates by the operation of a motor (not shown), the skimming plate (134) moves and removes the scum (S) floating in the treated water discharge space (114), The lifted scum (S) falls into the scum discharge tank (116) fixed to the rear of the floating tank (110) and is then discharged to the outside through the scum discharge port (116a). This scum skimmer 130 is already known in various forms in the technical field to which the present invention pertains, and of course, various types of known scum skimmers can also be adopted here.

The bubble generating device 150 is the most characteristic part of the present invention and includes a rotating tube 152, wings 151 for generating coarse bubbles, and a pore body 153 for generating fine bubbles.

The rotating tube 152 is provided to extend in the vertical direction while having a movement path 152b therein. The upper end of the rotating pipe 152 is located higher than the upper surface of the floating tank 110, and the lower end of the rotating pipe 152 is located in the raw water inflow space 112 of the floating tank 110. Accordingly, the rotary tube 152 penetrates the upper surface of the floating tank 110, and at this penetration point, the rotary tube 152 is rotatably supported on the upper surface of the floating tank 110. And the movement path 152b of the rotary tube 152 is used as a passage through which external air sucked from the outside of the floating tank 110 moves when the rotary tube 152 rotates.

The pore body 153 for generating fine bubbles has an upper and lower end, the upper end of which is fixed to the lower end of the rotating tube 152, and the upper and lower end can be rotated on the installation stand 155 installed on the lower surface of the floating tank 110. are tightly combined. Therefore, when the rotary tube 152 rotates, the pore body 153 for generating fine bubbles also rotates.

In addition, the pore body 153 for generating fine bubbles has an internal space that communicates with the movement path 152b of the rotary tube 152, and has pores on the outer peripheral surface that communicate with this internal space and the raw water inflow space 112. Therefore, when the pore body 153 for generating fine bubbles rotates together with the rotating tube 152, the external air sucked into the upper movement path 152b passes through the inner space of the pore body 153 for generating fine bubbles and then fills the upper pores. It passes through and is discharged into the raw water in the raw water inlet space 112. When external air is discharged to the raw water in the raw water inlet space 112, fine bubbles are generated in the raw water, and the fine bubbles then attach to the flocs of the raw water to form scum (S). The formed scum (S) rises to the surface of the raw water in the raw water inlet space 112 and then moves over the partition wall 113 to the treated water discharge space 114.

The blades 151 for generating coarse bubbles are fixed to the outer surface of the lower portion of the rotary tube 152 so as to be aligned along the circumferential direction of the rotary tube 152. Therefore, the wings 151 for generating coarse bubbles are located higher than the pore body 153 for generating fine bubbles and are immersed in the raw water filled in the raw water inlet space 112, and rotate together when the rotary tube 152 rotates. I do it. The wings 151 for generating coarse bubbles may be provided in two rows, top and bottom, as shown in FIG. 1, or may be provided in fewer or more rows. In addition, the number of wings 151 for generating coarse bubbles forming one row may be two as shown in FIG. 3, or may be more than this (e.g., three, four, etc.).

Each coarse bubble generation wing 151 has an internal space communicating with the movement path 152b of the rotary tube 152, and has pores 151a communicating this internal space with the raw water inflow space 112 at the tip ( tip). Therefore, when the coarse bubble generation wings 151 rotate together with the rotary tube 152, the external air sucked into the upper moving path 152b passes through the inner space of the coarse bubble generation wings 151 and then passes through the upper pores. It passes through (151a) and is discharged into the raw water in the raw water inlet space (112). When external air is discharged to the raw water in the raw water inflow space 112, coarse air bubbles are generated in the raw water, and then the coarse air bubbles attach to the flocs of the raw water to form scum (S). The formed scum (S) rises to the surface of the raw water in the raw water inlet space 112 and then moves over the partition wall 113 to the treated water discharge space 114.

Previously, the bubbles generated in the raw water in the raw water inlet space 112 when the rotary tube 152 rotates were explained by dividing them into fine bubbles and coarse bubbles, where fine bubbles have a size of 50 micrometers to 500 micrometers. It refers to air bubbles, and coarse air bubbles refer to air bubbles with a size of 500 micrometers to 1,000 micrometers. Although the definitions of fine bubbles and coarse bubbles are not clearly established in the technical field to which the present invention pertains, particle size analysis results show that the size of particles in raw water containing floc generally exists in the range of 10 micrometers to 1,000 micrometers. Based on this, fine bubbles and coarse bubbles are roughly classified and used as above, and bubbles smaller than 50 micrometers are classified and commonly used as ultrafine bubbles. Therefore, it should be understood that the sizes of the pores shown as having the membrane 153 for generating fine bubbles and the wings 151 for generating coarse bubbles are actually much smaller.

In floating solid-liquid separators, including distributed air floating solid-liquid separators, if the bubbles are larger or smaller than the floc particles, the bubbles do not adhere well to the floc, so the size of the floc particles and the size of the bubbles must be similar. And since raw water usually contains floc particles of various sizes, the size of the bubble particles must also be diverse to generate a large amount of scum, which can increase the solid-liquid separation efficiency of the floating solid-liquid separator.

However, in the conventional distributed air floating solid-liquid separators disclosed in the preceding literature, only coarse bubbles can be generated, which limits the ability to improve solid-liquid separation efficiency, whereas in the present invention, both coarse and fine bubbles are generated in raw water. This makes the solid-liquid separation efficiency much superior to that of conventional distributed air floating solid-liquid separations.

Meanwhile, the bubble generating device 150 preferably includes a plurality of blades 157. In this case, the blades 157 are provided to be fixed to the lower surface of the rotary tube 152 so as to extend from the outside of the pore body 153 for generating fine bubbles to the lower surface of the floating tank 110, that is, downward. It is provided to be arranged along the circumferential direction of the generating pore body 153.

When these blades 157 are provided, some of the fine bubbles formed in the raw water pass through the pores of the pore body 153 for generating fine bubbles together with the pore body 153 and the rotating tube 152. Since it is split into finer particles by the rotating blades 157, there is an advantage that even ultra-fine bubbles can be formed in the raw water.

At this time, the length of the blades 157 may be shorter than the upper and lower heights of the pore body 153 for generating fine bubbles (the lower ends of the blades 157 are located at approximately the center of the pore body 153 for generating fine bubbles). case), it may be similar (when the lower ends of the blades 157 are located at the lower part of the pore body 153 for generating fine bubbles). However, if the length of the blades 157 is shorter than the upper and lower heights of the pore body 153 for generating fine bubbles, fine bubbles are generated in areas where there are no blades 157, and ultrafine bubbles are formed in areas where the blades 157 are present. Since bubbles are generated, fine bubbles and ultrafine bubbles can be clearly distinguished and generated. Therefore, it is preferable that the length of the blades 157 is shorter than the vertical height of the membrane 153 for generating fine bubbles.

In addition, in the bubble generating device 150, a driven pulley 152a is formed in the rotary tube 152, and this driven pulley 152a is connected to the driving pulley 154a of the motor 154 through a power transmission body 154b. It is good that, unlike the conventional case, the rotary tube 152 and the motor 154 are separated, so it is very easy to repair the broken tube 152 or the motor 154.

At this time, the driven pulley 152a is rotatably supported on the upper surface of the floating tank 110 and is fixed to the outer surface of the rotating pipe 152, so that it rotates together with the rotating pipe 152, and the driving pulley 154a is floating. It is rotatably supported on the upper surface of the jaw 110 and is fixed to the drive shaft of the motor 154, so that it rotates when the motor 154 operates, and the power transmission body 154b includes a driving pulley 154a and a driven pulley 152a. It is wound and transmits the rotational force of the driving pulley (154a) to the driven pulley (152a).

Additionally, the bubble generating device 150 preferably has a fixed suction tube 156. In this case, the fixed suction tube 156 is rotatably coupled to the upper surface of the rotary tube 152, and is fixed to the support 156b fixed to the upper surface of the floating tank 110 via a connecting arm 156c. Therefore, the fixed suction tube 150 does not rotate even if the rotary tube 152 rotates.

And the fixed suction tube 156 has a hollow 156a, which has a smaller diameter than the moving path 152b of the rotating tube 152 and moves through the outer and outer upper moving path 152b of the floating tank 110. ) is connected. Therefore, when the rotary tube 152 rotates, the external air of the floating tank 110, that is, the external air, is self-absorbed into the hollow 156a of the fixed tube 156 and then moves downward along the upper movement path 152b.

In the conventional distributed air floating solid-liquid separators disclosed in the preceding literature, the intake holes are provided on the upper surface of the rotating air suction pipe and rotate together with the air suction pipe, so the amount of air sucked through the intake holes is insufficient. There was a problem. However, in the present invention, the fixed suction tube 156 having a hollow 156a through which external air is sucked does not rotate at all even when the rotary tube 152 rotates, so the amount of air sucked into the rotary tube 152 is significantly increased compared to the prior art. Then, the amount of bubbles formed in raw water increases, and the solid-liquid separation efficiency can be further improved compared to the prior art.

Hereinafter, the operating process of the distributed air floating solid-liquid separator 100 according to the present invention will be described.

When the motor 154 operates, the rotational force of the driving pulley 154a is transmitted to the driven pulley 152a to rotate the rotary tube 152, and when the rotary tube 152 rotates, the blades 151 for generating coarse bubbles, The pore body 153 and the blades 157 for generating fine bubbles also rotate together. On the other hand, even if the rotary tube 152 rotates, the fixed suction tube 156 does not rotate.

While the wings 151 for generating coarse bubbles, the pore body 153 for generating fine bubbles, and the blades 157 rotate, the external air in the moving path 152b of the rotating tube 152 due to centrifugal force is, first, It is discharged into the raw water through the pores 151a of the upper wings 151, which generates coarse bubbles in the raw water. Second, it is discharged into the raw water through the pores of the upper pore body 153, and fine bubbles are generated in the raw water. , Thirdly, the above fine bubbles are refined by the blade 157, thereby generating ultrafine bubbles in the raw water.

When the outside air in the moving passage 152b of the rotary pipe 152 is discharged to the raw water as above, the pressure in the moving passage 152b is lowered, so the outside air is sucked through the hollow 156a of the fixed suction pipe 156 to the moving passage (152b). 152b) continues to be supplied.

Meanwhile, air bubbles generated in the raw water attach to the surface of the floc, and then scum (S) is generated and rises to the surface of the raw water. The floating scum (S) is removed by the scum skimmer (130), and the treated water separated from the scum (S) is discharged to the outside of the floating tank (110). While scum (S) and treated water are discharged, raw water continues to flow into the floating tank (110).

< Second Embodiment >

In the previous first embodiment, it was explained that when the rotary tube 152 rotates, the external air of the floating tank 110, that is, the external air, is self-absorbed into the fixed suction tube 156. However, the fixed suction pipe 156 above may be connected to an air compressor (not shown) and a hose (not shown). Then, the air discharged from the air compressor is supplied to the fixed suction pipe 156, and this air is supplied to the rotary pipe (156). It flows along the movement path 152b of 152) and is discharged into raw water through the pores 151a of the wings 151 for generating coarse bubbles and the pores of the pore body 153 for generating fine bubbles.

In this embodiment, the pore body 153 for generating fine bubbles may be provided to rotate together with the rotary tube 152 as in the first embodiment, or may be provided to maintain a fixed posture even if the rotary tube 152 rotates. In the latter case, the upper end of the pore body 153 for generating fine bubbles is rotatably coupled to the lower end of the rotating tube 152, and the lower end of the pore body 153 for generating fine bubbles is attached to the lower surface of the floating tank 110. It is fixed to the installed installation stand (155).

Even when the pore body 153 for generating fine bubbles maintains a fixed posture, the blade 157 is fixed to the lower end of the rotary tube 152 and still rotates together with the rotary tube 152.

As described above, although the present invention has been described with limited examples and drawings, the present invention is not limited thereto, and the technical idea of the present invention and the following will be understood by those skilled in the art to which the present invention pertains. Of course, various modifications and variations can be made within the scope of equivalency of the claims to be described, and the above-described embodiments can be combined in various ways.

100: Dispersed air floating solid-liquid separator 110: Floating tank
112: raw water inlet space 114: treated water discharge space
130: Scum skimmer 150: Bubble generating device
151: Wing for generating coarse bubbles 151a: Pores
152: Rotating tube 152a: Driven pulley
152b: Movement path 153: Porous body for generating fine bubbles
154: motor 154a: driving pulley
154b: Power transmission body 156: Fixed suction pipe
156a: hollow 156b: support
157: blade

Claims (9)

A floating tank having an internal space divided into a raw water inlet space provided to receive raw water containing floc, and a treated water discharge space provided to discharge treated water separated from scum formed by air bubbles attached to the floc; and
It includes a bubble generating device that generates bubbles to attach to the floc by discharging air into the raw water in the raw water inflow space,
The bubble generating device,
A rotary tube extending from the upper part of the flotation tank to rotatably penetrate the upper surface of the flotation tank and extending into the raw water inflow space, and having the air movement path therein;
A plurality of coarse air bubble generating wings are fixed to a portion of the rotary tube located in the raw water inlet space and are provided to generate coarse air bubbles by discharging air in the moving path of the rotary tube to raw water when the rotary tube rotates. ; and
A pore body for generating fine bubbles, which has an upper end coupled with the lower end of the rotary tube and a lower end coupled with the lower surface of the flotation tank, and is provided to generate fine bubbles by discharging the air introduced from the moving path into raw water; and
It is rotatably coupled to the upper surface of the rotating tube, is fixed to a support fixed to the upper surface of the floating tank, has a smaller diameter than the moving path of the rotating tube, and is connected to the outside of the floating tank and the moving path of the rotating tube. A distributed air floating solid-liquid separator comprising: a fixed suction tube having a communicating hollow, connected to an air compressor, and provided to supply air discharged from the air compressor to a moving path of the rotary tube. delete According to paragraph 1,
The pore body for generating fine bubbles has an upper end fixed to the lower end of the rotary tube and a lower end rotatably coupled to the lower surface of the floating tank, and the air introduced through the movement path of the rotary tube after being discharged from the air compressor A distributed air floating solid-liquid separator that discharges into the raw water when the rotary tube rotates. delete According to paragraph 1,
The pore body for generating fine bubbles has an upper end rotatably coupled to the lower end of the rotary tube and a lower end fixed to the lower surface of the floating tank, and the air discharged from the air compressor and then introduced through the movement path of the rotary tube A distributed air floating solid-liquid separator that discharges into the raw water. According to claim 1 or 3 or 5,
The bubble generating device,
A distributed air flotation method comprising: a plurality of blades fixed to the lower surface of the rotary tube so as to extend from the outside of the porous body for generating fine bubbles toward the lower surface of the flotation tank, and arranged along the circumferential direction of the porous body for generating fine bubbles; Solid-liquid separator. According to clause 6,
A distributed air floating solid-liquid separator wherein the plurality of blades have a length shorter than the upper and lower heights of the pore body for generating fine bubbles. According to claim 1 or 3 or 5,
A driven pulley is fixed to the portion of the rotating tube located at the upper part of the floating tank, and the driven pulley is connected to the driving pulley of the motor installed in the floating tank through a power transmitter. According to claim 1 or 3 or 5,
A dispersed air floating solid-liquid separator wherein the wing for generating coarse bubbles has an internal space communicating with the movement path of the rotary tube, and has pores at the tip communicating with the internal space.

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