JP2005125205A - Air diffuser, foam separator and wastewater purification system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently diffuse a large amount of fine bubbles into liquid to be treated, and to efficiently take out pollutants etc., in the liquid to be treated. <P>SOLUTION: An air diffuser 10 has a casing 11 having a gas outlet surface in which many small holes for spouting gas are formed, and a thin sheet-like bubble atomizing member 15 facing the gas outlet surface so as to leave a fixed gap between them. The bubble atomizing member 15 is freely rotatable in the casing 11, and, for example, has a radially extending slit. The bubbles discharged from the small holes are cut and atomized when they pass through the slit opening. Rotation of the bubble atomizing member 15 efficiently diffuses the bubbles in the liquid. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an air diffuser that blows and disperses bubbles in a liquid, a foam separation device using the air diffuser, and a drainage purification system.

  2. Description of the Related Art Conventionally, for example, the following configuration is known as a foam separation device for separating fine pollutants contained in breeding water in aquatic creature breeding aquarium (Patent Document 1). In this method, the water to be treated sent from the breeding water tank is guided into the inner cylinder, and fine bubbles are generated in the inner cylinder by the air diffuser. That is, the pollutant or the like floats up to the liquid surface by the bubbles adhering to the outer peripheral surface, and a large amount of bubbles containing the pollutant are discharged from the liquid surface to the outside of the foam separation device. The treated water not containing the pollutant is guided into the outer cylinder surrounding the outer periphery of the inner cylinder, discharged from the outer cylinder, and returned to the breeding water tank.

Conventional diffusers usually have a cylindrical or flat porous sintering material. However, since high pressure is required to blow bubbles from the sintered material, energy consumption increases. If a large amount of gas is blown out, the bubble diameter becomes too large, which is not suitable for removing pollutants. On the other hand, in order to generate a small bubble to some extent, there is a limit to the amount of gas blown out. Therefore, it has been difficult to sufficiently improve the purification performance of the water to be treated in the foam separation apparatus using the conventional air diffuser.
JP 2001-170617 A

  The present invention provides an air diffuser capable of efficiently dispersing a large amount of fine bubbles in a liquid to be treated, and efficiently using this air diffuser to remove contaminants and the like in the liquid to be treated. It is an object of the present invention to provide a foam separation device and a waste water purification system that can be used.

  An air diffuser according to the present invention is provided with a casing having a gas blowing surface in which a large number of small holes for blowing gas are formed, and a gas blowing surface facing the gas blowing surface with a predetermined gap and being relatively movable. And a thin plate-like bubble refining member having a slit-like opening.

  A large number of small holes are arranged radially, for example, on the gas blowing surface. The casing has, for example, a cylindrical shape. In this case, the gas blowing surface is preferably the upper surface or the bottom surface of the cylinder. The slit-shaped openings may extend radially. Preferably, the bubble refining member is rotatable around a predetermined axis while maintaining a parallel state with respect to the gas blowing surface. Thereby, the bubbles blown out from the small holes are cut and refined by passing through the slit-like openings, and the bubbles are efficiently dispersed by rotating and stirring the entire liquid to be treated. Therefore, it effectively adheres to the surface of the pollutant and promotes the flotation of the pollutant.

  The foam separation apparatus according to the present invention is a foam separation apparatus that takes out the pollutant from a large amount of bubbles that are generated by the bubbles generated by the air diffuser adsorbed on the surface of the pollutant contained in the liquid to be treated and floated on the liquid surface And it is provided with the main body, the foam collection part which is provided in the main body and attracts | sucks and collects the foam | bubble on a liquid level, and the defoaming part which liquefies the foam suck | inhaled by the foam collection part.

  It is preferable that the foam separation device includes an overflow wall that is provided in the main body and divides into an aeration chamber and an overflow chamber, and an upper end portion is located below the liquid level. According to this configuration, the treated liquid from which contaminants and the like have been removed flows into the overflow chamber over the overflow wall and is discharged from the foam separation device to the outside.

  It is preferable that a liquid supply port for supplying the liquid to be processed is provided in the lower part of the main body, and a liquid discharge port for discharging the processed liquid from the overflow chamber is provided. The liquid supply port may be opened at a portion that is the bottom of the main body and faces the diffuser. The liquid supply port opens on the side surface of the main body, the air diffuser is placed on the inner floor provided above the liquid supply port, and the liquid inlet is formed at a portion of the inner floor facing the air diffuser. May be.

  The overflow wall has a flat plate shape, for example, but when the main body has a cylindrical shape, the overflow wall may have a cylindrical shape concentric with the main body.

  Preferably, the defoaming portion includes a housing and a baffle plate that is collided with and destroyed by bubbles guided into the housing. Thereby, a pollutant etc. are taken out efficiently.

  The waste water purification system according to the present invention includes the above air diffuser, an air supply unit that supplies gas to the air diffuser, and the foam separation device, and the air supply unit is disposed in the foam collecting unit via the defoaming unit. It is characterized by sucking bubbles and supplying exhaust generated by this suction to the air diffuser.

  As described above, according to the present invention, an air diffuser that can efficiently disperse a large amount of fine bubbles in a liquid to be treated, and a pollutant in the liquid to be treated can be efficiently used by using the air diffuser. A foam separation device and a waste water purification system that can be taken out well are obtained.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic cross-sectional view schematically showing a wastewater purification system including an air diffuser and a foam separator according to an embodiment of the present invention. This waste water purification system is used to purify the liquid to be treated, which is seawater used for cleaning pearl oysters, for example, but may be used to purify other liquids to be treated.

  The waste water purification system includes an air diffuser 10, a foam separator 50, and a blower 90. The air diffuser 10 is provided in the main body 51 of the foam separation device 50 and blows and disperses a large number of bubbles in the liquid W to be stored in the main body 51. Bubbles adhere to the surface of the pollutant contained in the liquid W to be treated, and the pollutant floats to the liquid surface. As a result, a large amount of bubbles are generated on the liquid surface, and the bubbles are sucked by the bubble collecting part 52 and liquefied in the defoaming part 53. Negative pressure for sucking bubbles is generated by the blower 90, and the exhaust of the blower 90 is sent to the air diffuser 10.

  The interior of the main body 51 of the foam separation device 50 is partitioned into an aeration chamber 55 and an overflow chamber 56 by an overflow wall 54. The lower end portion of the overflow wall 54 is fixed to the bottom surface of the main body 51, and the upper end portion is located below the liquid level. A liquid supply port 57 for supplying seawater, which is a liquid to be processed, to the aeration chamber 55 is opened on the side surface of the lower portion of the main body 51. A drainage port 58 for discharging seawater, which is a processed liquid, from the overflow chamber 56 is provided at the lower part of the side surface opposite to the liquid supply port 57 of the main body 51.

  In the air diffuser chamber 55, an inner floor 60 is provided above the liquid supply port 57. The air diffuser 10 is installed on the inner floor 60 through, for example, a plurality of support legs 61, and a liquid inlet 62 is formed at a portion of the inner floor 60 facing the air diffuser 10.

  The foam collecting part 52 is provided on the upper part of the main body 51. The bubble collecting part 52 has, for example, a conical shape, and one end of the bubble discharging pipe 63 is connected to the apex of the cone. The other end of the bubble removing pipe 63 is connected to the upper portion of the housing 67 of the defoaming part 53, and a liquefaction mechanism 64 is provided at the tip of the bubble removing pipe 63 in the housing 67 of the defoaming part 53. In addition, an intake pipe 65 is connected to the upper portion of the housing 67 of the foam collecting portion 52, and the other end of the intake pipe 65 is connected to the blower 90. An exhaust pipe 66 is connected to the blower 90, and the exhaust pipe 66 is connected to the air diffuser 10.

  When the blower 90 is actuated, bubbles are sucked in the bubble collecting portion 52 through the intake pipe 65, the housing 67 of the bubble collecting portion 52, and the bubble removing pipe 63. Exhaust gas generated by the suction, that is, air is supplied to the air diffuser 10 through the exhaust pipe 65.

  FIG. 2 is a view of the inside of the main body 51 of the foam separation device 50 as viewed from above. That is, the main body 51 has a rectangular shape when viewed from above, and the overflow wall 54 has a flat plate shape. The air diffuser 10 is located in the approximate center of the air diffuser chamber 55 and has a circular shape when viewed from above.

3 to 6 show the air diffuser 10.
3 and 4 show the casing 11 of the air diffuser 10 upside down. As shown in these drawings, the casing 11 has a flat cylindrical shape, and a large number of small holes 13 for blowing gas are formed in the gas blowing surface 12 which is the bottom surface of the cylinder. The small holes 13 are arranged radially around the center of the gas blowing surface 12. Each row of small holes 13 is arranged at equiangular intervals. In addition, the arrangement | sequence of the small hole 13 does not need to be radial, for example, may be uniformly distributed in the gas blowing surface 12, and is defined arbitrarily.

  An air inlet 14 is provided on the side surface of the casing 11. An exhaust pipe 66 connected to the blower 90 is connected to the air inlet 14 (see FIG. 1), and exhaust from the blower 90 is guided into the casing 11.

  As shown in FIG. 5, the bubble miniaturizing member 15, which is a thin disk, faces the gas blowing surface 12 with a predetermined gap. The bubble refining member 15 is provided to be rotatable with respect to the gas blowing surface 12. That is, the bubble refining member 15 is rotatable around the central axis of the disk while maintaining a parallel state with respect to the gas blowing surface 12.

  The bubble miniaturizing member 15 is formed with a plurality of slit-like openings 16 that extend linearly from the center in the radial direction. Each slit-shaped opening 16 preferably has an equiangular interval, but is not limited thereto. The slit-shaped openings 16 do not have to be radial, and are arbitrarily determined according to the purpose.

  FIG. 6 shows a state where the air diffuser 10 is actually installed in the foam separator 50. As shown in this figure, the air diffuser 10 is installed so that the bubble refining member 15 is on the lower side. A motor 17 is placed on the upper surface of the casing 11. Electric power is supplied to the motor 17 from a power supply device (not shown), but the power supply device may be a power source for the blower 90 (see FIG. 1). The rotating shaft 18 of the motor 17 extends through the axial center portion of the casing 11. The bubble refining member 15 is fixed to a protruding portion of the rotating shaft 18 from the bottom surface of the casing 11.

  When the motor 17 is driven in a state where air is supplied from the blower 90, the thin plate-shaped bubble miniaturizing member 15 rotates about the rotation shaft 18, so that the bubbles discharged from the small holes 13 are slit-shaped openings. 16 is cut and refined. Further, since the liquid to be processed is rotated and stirred as a whole by the rotation of the bubble refining member 15, the refined bubbles A rise while rotating, and convect and efficiently disperse in the liquid to be processed.

  FIG. 7 shows the liquefaction mechanism 64 of the foam separation device 50. The liquefaction mechanism 64 includes a cylindrical member 71 fixed to the tip of the bubble discharging pipe 63, and a baffle plate 72 provided in the cylindrical member 71. The cylindrical member 71 is open on the lower side, and the tip of the bubble discharging pipe 63 extends to the approximate center of the cylindrical member 71. The baffle plate 72 is opposed to the tip opening of the bubble discharging pipe 63 and is fixed to the inner wall of the cylindrical member 71 by an appropriate connecting member.

  Therefore, a large amount of bubbles discharged from the bubble discharging pipe 63 into the casing 11 collides with the baffle plate 72 and is destroyed. That is, the foam is liquefied and falls to the bottom of the housing 67 of the defoaming part 53 together with the pollutant.

In the wastewater purification system of the present embodiment, the liquid to be treated is purified by the following action.
First, the liquid to be treated is supplied from a drainage device (not shown) and supplied into the main body 51 from the liquid supply port 57. When the liquid level exceeds the upper end of the overflow wall 54, the power feeding device of the motor 17 and the blower 90 are driven. As a result, the bubble refining member 15 rotates and a large amount of bubbles are generated in the main body 51. The bubbles rise while swirling, adhere to the pollutant contained in the liquid to be treated, and a large amount of bubbles are generated on the liquid surface. The bubbles are sucked from the bubble collecting portion 52 by the bubble removing pipe 63 and guided to the defoaming portion 53. In the defoaming section 53, the foam is liquefied and the pollutant is taken out from the foam. That is, the pollutant is mixed in the liquid and stored in the housing 67.

  On the other hand, in the main body 51, the treated liquid from which the contaminants have been removed flows from the diffuser chamber 55 to the overflow chamber 56 over the overflow wall 54. Then, the treated liquid is discharged to the outside from the drain port 58 of the overflow chamber 56.

  As described above, in the present embodiment, instead of using a porous sintered material, the air bubbles refined by rotating the air bubble refining member 15 facing the casing 11 having a large number of small holes with minute gaps are removed. Is generated. Therefore, not only can a large amount of bubbles be blown into the liquid with less energy consumption than before, but also the bubbles can be diffused over a wide range in the liquid, and the purification performance of the liquid to be treated is sufficiently enhanced. Further, since the bubbles are efficiently dispersed in the liquid, they do not adhere to the inner wall surface of the main body 51 or become coarse.

  FIG. 8 shows another embodiment of the waste water purification system. The difference from the waste water purification system of FIG. 1 is that the air diffuser 10 is placed not on the inner floor 60 (FIG. 1) but on the bottom 81 of the main body 51 via the leg member 82. Further, the liquid supply port 57 opens at a portion facing the diffuser 1 at the bottom 81. Since other configurations are the same as those in FIG. 1, the description thereof is omitted.

  FIG. 9 shows another embodiment of the air diffuser 10. A gas blowing surface 12 is formed on the upper surface of the casing 11, and the bubble refining member 15 is provided on the upper side of the casing 11. The motor 17 is provided above the air diffuser 10 and above the liquid level B. The rotating shaft 18 of the motor 17 extends vertically downward and is fixed to the center of the bubble miniaturizing member 15. Accordingly, the air bubbles refined by the air bubble refining member 15 are directly blown upward from the air bubble refining member 15 and diffused into the liquid. Other configurations are the same as the example shown in FIGS.

  FIG. 10 shows another example of the main body 51 of the foam separation device 50. The main body 51 has a cylindrical shape, and the air diffuser 10 is provided at substantially the center of the main body 51. The overflow wall 54 is formed at a position shifted from the center of the main body 51 to the drainage port 58 side. Other configurations are the same as those in FIGS.

  FIG. 11 shows still another example of the foam separation device 50. The main body 51 has a cylindrical shape, and the overflow wall 54 has a cylindrical shape concentric with the main body 51. That is, the overflow chamber 56 has a cylindrical shape surrounding the air diffusion chamber 55. Other configurations are the same as those in FIGS.

It is typical sectional drawing which shows roughly the waste water purification system provided with the diffuser and foam separation apparatus which are one Embodiment of this invention. It is the figure which looked at the inside of the main part of a foam separation device from the top. It is a perspective view which shows the casing of an air diffuser upside down. It is sectional drawing which shows the casing of an air diffuser upside down. It is a perspective view which shows the bubble refinement | miniaturization member of an air diffuser. It is a side view which shows the state by which an air diffuser is actually installed in a foam separation apparatus. It is sectional drawing which shows the liquefaction mechanism of a foam separator. It is typical sectional drawing which shows other embodiment of a waste water purification system. It is a side view which shows other embodiment of a diffuser. It is a top view which shows the other example of the main body of a foam separation apparatus. It is a top view which shows the further another example of the main body of a foam separation apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Air diffuser 11 Casing 12 Gas blowing surface 13 Small hole 15 Bubble refinement member 16 Slit-shaped opening 50 Foam separator 51 Main body 53 Defoaming part

Claims (16)

An air diffuser that is installed in a liquid to be treated and blows and disperses bubbles in the liquid to be treated.
A casing having a gas blowing surface in which a large number of small holes for blowing the gas are formed;
An air diffuser comprising: a thin-plate-shaped bubble refining member that is opposed to the gas blowing surface with a predetermined gap and is relatively movable, and has a slit-like opening.   The air diffuser according to claim 1, wherein the plurality of small holes are arranged radially on the gas blowing surface.   The air diffuser according to claim 1, wherein the casing has a cylindrical shape.   The air diffuser according to claim 3, wherein the gas blowing surface is an upper surface or a bottom surface of a cylinder.   The air diffuser according to claim 1, wherein the slit-shaped openings extend radially.   The air diffuser according to claim 1, wherein the bubble refining member is rotatable around a predetermined axis while maintaining a parallel state with respect to the gas blowing surface. A foam separation device that takes out the pollutant from a large amount of bubbles that are generated by the air bubbles generated by the air diffuser according to claim 1 adsorbed on the surface of the pollutant contained in the liquid to be treated and floated on the liquid surface,
The body,
A foam collecting part provided in the main body, for sucking and collecting the bubbles on the liquid surface;
A foam separating apparatus comprising: a defoaming unit that liquefies foam sucked by the foam collecting unit.   The foam separation device according to claim 7, further comprising an overflow wall provided in the main body, divided into a diffuser chamber and an overflow chamber, and having an upper end portion located below the liquid level. .   The foam separating apparatus according to claim 8, wherein a liquid supply port for supplying a liquid to be processed is provided in the lower part of the main body.   The foam separating apparatus according to claim 9, wherein a drainage port for discharging the treated liquid from the overflow chamber is provided at a lower portion of the main body.   The foam separating apparatus according to claim 9, wherein the liquid supply port opens at a part of the bottom of the main body that faces the diffuser.   The liquid supply port opens on a side surface of the main body, the air diffuser is placed on an inner floor provided above the liquid supply port, and a liquid is provided at a portion of the inner floor facing the air diffuser. The foam separation device according to claim 9, wherein an introduction port is formed.   The foam separating apparatus according to claim 8, wherein the overflow wall has a flat plate shape.   The foam separating apparatus according to claim 8, wherein the main body has a cylindrical shape, and the overflow wall has a cylindrical shape concentric with the main body.   The foam separating apparatus according to claim 7, wherein the defoaming portion includes a housing and a baffle plate that is collided with and destroys the foam guided into the housing. An air diffuser according to claim 1;
An air supply means for supplying gas to the air diffuser;
The foam separation device according to claim 7, wherein the air supply unit sucks bubbles in the bubble collecting unit via the defoaming unit, and supplies exhaust generated by the suction to the diffuser. A wastewater purification system characterized by

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