JP2007209943A - Air diffuser - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air diffuser used for an aeration tank treating sewage or organic industrial wastewater, capable of automated washing of the surfaces of air diffusion membranes with simple constitution. <P>SOLUTION: This air diffuser is provided with the air diffusion membranes on its surface, a cylindrical air dispersion cylinder generation bubbles from the inside, blades attached to the air dispersion cylinder and rotated by up-flowing water stream generated by bubbles released from the air diffuser, and washing brushes sliding on the surfaces of the air diffusion membranes. Rotary rings having blades are mounted on both sides of an air diffusion part, washing brush shafts are provided between the rotary rings, and the washing brushes are provided on the washing shafts. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an air diffuser used in an activated sludge method for treating sewage, organic industrial wastewater, and the like.

  Conventionally, in the method of treating organic wastewater discharged from sewage, human waste, livestock facilities, various factories, etc. with activated sludge, a plate shape is used to diffuse air or oxygen gas into the water to be treated in the aeration tank. Or the diffuser shape | molded by the cylinder shape is installed. As such an air diffuser, an air diffuser that generates bubbles from pores of a porous ceramic is known, but in recent years, an air diffuser including an air diffuser film that can generate fine bubbles is used. .

  An air diffuser using a diffuser membrane is provided with a diffuser membrane in which a large number of bubble ejection holes are formed in a synthetic resin or synthetic rubber sheet having moderate elasticity on a base plate, and between the base plate and the diffuser membrane. Compressed air is supplied to the air and fine air bubbles are generated from the bubble ejection holes generated by expanding the diffuser film by air pressure.

Here, if the operation period of the device is extended for a long time, the diffuser holes may be blocked by the adhesion of solid matter such as sludge in the water to be treated, resulting in a decrease in oxygen supply efficiency and an increase in air pressure in the diffuser. is there.
As a method for eliminating such a blockage of the diffuser membrane, for example, in Patent Document 1, air blowing to the air diffuser during normal operation is stopped and the remaining gas in the air diffuser is exhausted and then re-air blown. Doing or switching the operation of the air diffuser from normal operation to increase the amount of air blown to the air diffuser to 120% or more of normal operation, the air diffuser film expands and contracts, and adheres in the air diffuser hole and in the vicinity of the air diffuser It is disclosed to remove soil components such as solids.
JP 2004-313938 A

  However, in the above-described method, air blowing to the aeration tank must be stopped to prevent clogging, and the wastewater treatment efficiency is reduced. Further, if the blast volume is 120% or more of the normal operation, it becomes difficult to control the dissolved oxygen, which causes an increase in cost.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to provide an air diffuser that can automatically clean the surface of the diffuser membrane with a simple configuration.

The present invention has been made to achieve the above-described problems, and has been solved by the following means.
In an air diffuser having a cylindrical air diffuser having a diffuser film on the surface and generating bubbles from the inside, the blades attached to the cylindrical air diffuser and rotated by the rising water flow generated by the bubbles discharged from the air diffuser And a cleaning brush that slides on the surface of the diffuser membrane by the rotation of the blades.

  In addition, a rotatable rotating ring equipped with blades is attached to both ends of the diffuser of the cylindrical diffuser cylinder, a cleaning brush shaft is provided between the rotating rings at both ends, and the surface of the diffuser is attached to the cleaning brush shaft. Provide a sliding cleaning brush, and attach a rotatable rotating ring to both ends of the diffuser of the cylindrical diffuser. The cleaning brush shaft provided between the rotating rings on both ends penetrates the outer rotating ring. And a cleaning brush that slides on the surface of the air diffuser on the shaft of the air cleaner between the rotating rings and is coupled to a blade that is rotatably attached to the outside of the air diffuser.

  In addition, a rotatable rotating ring is attached to both ends of the air diffuser of the cylindrical diffusion cylinder, and a blade is provided on the cleaning brush shaft provided between the rotating rings on both ends or the shaft provided between the rotating rings. It is also characterized.

  In the air diffuser of the present invention, a blade attached to a cylindrical diffusion cylinder having a diffuser film on the surface and generating bubbles from the inside is rotated by the rising water flow generated in the aeration tank, and is rotated by the blade. Since the cleaning brush coupled to the rotating ring can slide on the surface of the diffuser membrane and wipe off the deposits on the diffuser membrane surface effectively, it becomes possible to prevent the diffuser from being blocked. .

In addition, since the air diffuser of the present invention is always automatically cleaned with a simple configuration, it is not necessary to repeat the ventilation / stopping operation, and a stable operation of the wastewater treatment facility is possible.
In addition, it uses a rising water flow generated by aeration and can be washed without power.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, the present invention is not limited to the following embodiments, and can be implemented with appropriate modifications.
FIG. 1 is a schematic view of an air diffuser according to the present invention, and FIG. 2 is a schematic view showing a state where an air diffuser 100 according to the present invention is provided in a deep aeration tank 50.

  The air diffuser 100 includes a blower pipe P1 connected to a blower, a header pipe P2 that distributes compressed gas such as air supplied from the blower pipe P1, and one or more cylindrical diffusers connected to the header pipe P2. (Hereinafter simply referred to as a “spread cylinder”) 1.

The diffuser cylinder 1 includes a cylindrical pipe part P3 having a connection port P22 of the header pipe P2 at the center, and an air diffuser part P4 provided in communication with both sides of the cylindrical pipe part P3.
The diffuser part P4 is configured by attaching the diffuser film 11 to the outer surface of a diffuser film support member such as a cylindrical wire mesh attached to the cylindrical tube part P3.
The diffuser cylinder 1 is coupled to a blade f (f1, f2, f3) that is rotated by the rising water flow of the water W to be described later, and a rotating ring that is rotated by the rotation of the blade f. A cleaning brush 14 that slides on the surface of the film 11 is attached.

  As the diffuser membrane 11, a synthetic resin or a synthetic rubber having a large number of bubble ejection holes having moderate elasticity such as polyurethane, silicon, ethylene propylene rubber or the like is used.

  Both ends of the diffuser membrane 11 are sealed with sealing fittings 12A and 12B. For this reason, the compressed air introduced from the blower pipe P1 is sent from the cylindrical pipe part P3 of the diffuser cylinder 1 connected to the header pipe P2 to the diffuser part P4 and aerated as fine bubbles from the diffuser film 11. Air is diffused into the water to be treated W in the tank 50.

Next, a method of using the diffuser 100 of the present invention by immersing it in the aeration tank 50 will be described.
FIG. 2 shows a case where the aeration apparatus 100 of the present invention is installed in a deep aeration tank 50 of an activated sludge treatment facility (not shown). The deep aeration tank 50 has a water depth of about 8 to 10 m or more. The partition wall 51 is disposed at the center of the deep aeration tank 50 to form two water channels (R, L).

The air diffuser 100 is disposed in the middle layer portion of one water channel side R, and diffuses compressed air sent from the blower B as fine bubbles in the water to be treated W.
The compressed air sent from the blower B is diffused into the water to be treated W as fine bubbles by the air diffuser 100, so that a gas lift is formed in the water to be treated W on the water channel side R where the air diffuser 100 is installed. Due to the effect, an ascending water flow is generated, and a falling water flow is generated in the water to be treated W of the other water channel L to form a circulating water flow. The treated water W is mixed by the circulating water flow, and oxygen in the fine bubbles diffused from the air diffuser 100 is efficiently dissolved in the treated water W.

  2 shows an example in which the aeration device 100 is provided in the deep aeration tank 50. However, in a normal aeration tank having a water depth of about 5 m, the aeration device 100 is provided almost on the entire bottom of the aeration tank. As a result, an ascending water flow of the treated water W is generated, and the as-treated water W is mixed by the rising water flow, and oxygen in the diffused fine bubbles is efficiently dissolved in the treated water W. To do.

  By causing fine bubbles to diffuse into the aeration tank 50 from the diffuser 100, an ascending water flow of the water to be treated W is generated, and the blade f attached to the diffuser cylinder 1 of the diffuser 100 rotates, and this blade By the rotation of f, the cleaning brush 14 slides on the surface of the diffuser film 11 mounted on the outer periphery of the diffusion cylinder 1 and wipes it in contact with the deposits on the surface. For this reason, there is no adhesion and accumulation of sludge such as biological slime on the surface of the diffuser membrane, and clogging of the diffuser membrane 11 can be prevented.

  In the air diffuser 100 according to the present invention, the blade attached to the diffuser cylinder 1 is rotated by the rising water flow of the water W to be treated generated by the generated fine bubbles, and the cleaning brush 14 is diffused by the rotation of the blade f. Since the surface of 11 is slid, washing without power is possible.

  Further, when the cleaning brush 14 sweeps the surface of the diffuser membrane 11, the diffuser device 100 of the present invention shears the fine bubbles generated from the surface of the diffuser membrane 11 to make the bubbles finer. Therefore, it is possible to further improve the oxygen transfer efficiency into the water to be treated W.

  Next, the diffuser cylinder 1 of the air diffuser 100 will be described. FIG. 3 is a schematic sectional view of the diffusion cylinder 1 provided with rotating blades f1 and f2 and a cleaning brush 14 that slides on the surface of the diffuser membrane 11 by the rotating blades f1 and f2. FIG. 4 is a schematic view showing the H1-H1 cross section of FIG.

As already described, the diffuser cylinder 1 includes a cylindrical tube part P3 having a connection port P22 of the header pipe P2 at the center, and an air diffuser part P4 to which the diffuser film 11 is attached on both sides thereof.
At the end of the air diffuser P4, sealing metal fittings 12A, 12B are attached outside, and inside the cylindrical tube part P3, donut-shaped circular plates 15A, 15B having the same outer diameter as the sealing metal fittings 12A, 12B are attached. Rotating rings R2 and R1 are rotatably mounted on the outer peripheries of the sealing fittings 12A and 12B and the circular plates 15A and 15B. A blade f1 is attached to the rotating rings R1 and R2.
A cleaning brush shaft 13 is provided between the rotating ring R1 mounted on the circular plates 15A and 15B and the rotating ring R2 mounted on the sealing fittings 12A and 12B. A cleaning brush 14 is attached.

Therefore, when an ascending water flow is generated by the bubbles released from the diffuser membrane 11, the blade f1 rotates and the rotating rings R1 and R2 rotate. By the rotation of the rotating rings R1 and R2, the cleaning brush 14 attached to the cleaning brush shaft 13 slides on the surface of the diffuser film 11 of the diffuser part P4.
Thereby, the surface of the diffuser film 11 can be efficiently wiped off, and clogging of the diffuser film 11 can be prevented.
In addition, you may attach circular board 15A, 15B to the both ends of the cylindrical pipe part P3. FIG. 4 shows that the rotating ring R2 is rotated by the rotation of the blade f1 attached to the rotating ring R2.

Furthermore, as shown in FIG. 3, the blade f2 can be provided on the cleaning brush shaft 13 so as to increase the rotational force of the rotating rings R1 and R2. The blade f2 can increase the sliding speed of the cleaning brush 14 and enhance the cleaning effect on the surface of the diffuser membrane 11.
The blade f2 may be attached to a shaft provided separately between the rotating rings R1 and R2.
Moreover, it is possible to sufficiently wipe the surface of the diffuser membrane 11 with only the above-described blade f2 without providing the blade f1.

FIG. 5 is a schematic cross-sectional view of the dust cylinder 1 having blades f3 having different shapes. FIG. 6 is a schematic view showing the H2-H2 cross section of FIG.
In the diffuser cylinder 1 shown in FIG. 4, the rotating rings (R1, R2) and the blades f1 are integrated, but in the diffuser cylinder 1 shown in FIG. 5, the blades f3 are attached to the outside of the air diffuser P4. It has a structure.

  That is, the blade f3 is attached to the shaft S fixed at the center of the sealing metal fitting 12B so as to be rotatable. Further, rotating rings R4 and R3 are rotatably mounted on the outer periphery of the sealing metal fitting 12B and the circular plate 15B, and the cleaning brush shaft 13a provided between the rotating rings R3 and R4 penetrates the outer rotating ring R4. The blade f3 is rotatably connected to the outside of the air diffusion part P4.

  Therefore, when an ascending water flow is generated by the bubbles released from the diffuser membrane 11, the blade f3 rotates, and the rotation ring R4 is rotated by the rotation of the blade f3. By the rotation of the rotating ring R4, the cleaning brush 14 attached to the cleaning brush shaft 13a slides on the surface of the diffuser membrane 11.

In this case, since the large blade f3 can be attached to the outside of the air diffusion part P4, a large rotational force can be obtained, the sliding speed of the cleaning brush 14 can be increased, and the surface cleaning effect of the air diffusion film 11 is improved. To do.
FIG. 6 shows that the rotating ring R4 is rotated by the rotation of the blade f3.

The cleaning brush 14 is preferably flexible so as not to damage the diffuser membrane 11, and can be made of chemical fiber or metal fiber having excellent water resistance and corrosion resistance.
In addition, when a cleaning brush 14 made of antibacterial copper or silver-containing fibers or antibacterial synthetic fibers that suppress the growth of microorganisms is used, slime such as microorganisms is prevented from adhering to the surface of the diffuser membrane. Therefore, it is more effective in preventing clogging of the diffuser membrane 11.

It is the schematic of the aeration apparatus of this invention. It is the schematic which shows the state which provided the diffuser of this invention in the deep layer aeration tank. It is a schematic sectional drawing of the scattering cylinder which attached the blade | wing and the washing brush. It is the schematic which shows the H1-H1 cross section of FIG. It is a schematic sectional drawing of the dispersion cylinder which attached the blade | wing of another shape. It is the schematic which shows the H2-H2 cross section of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Air cylinder 11 Air diffuser film 12 Sealing metal fittings (12A, 12B)
50 Deep layer aeration tank 51 Bulkhead 100 Air diffuser P1 Air blow pipe P2 Header pipe P3 Cylindrical pipe part P4 Air diffuser part P22 Header pipe connection port f Blade (f1-f3)
R1, R2 Rotating ring R3, R4 Rotating ring S shaft 13, 13a Cleaning brush shaft 14 Cleaning brush B Blower W Water to be treated

Claims (4)

  In an air diffuser having a cylindrical air diffuser having a diffuser film on the surface and generating bubbles from the inside, the blade attached to the cylindrical air diffuser and rotated by the rising water flow generated by the air bubbles discharged from the air diffuser And a cleaning brush that slides on the surface of the diffuser membrane by the rotation of the blades.   A rotatable rotating ring with blades is attached to both ends of the diffuser of the cylindrical diffuser cylinder, a cleaning brush shaft is provided between the rotating rings at both ends, and the surface of the diffuser is slid on the cleaning brush shaft. The aeration apparatus according to claim 1, further comprising a cleaning brush that performs cleaning.   A rotatable rotating ring is attached to both ends of the diffuser of the cylindrical diffuser cylinder, and the cleaning brush shaft provided between the rotating rings at both ends passes through the outer rotating ring and rotates to the outside of the diffuser. The air diffuser according to claim 1, further comprising a cleaning brush that is coupled to freely attached blades and slides on a surface of the air diffuser on a cleaning brush shaft between the rotating rings. A rotatable rotating ring is attached to both ends of the air diffuser of the cylindrical diffusion cylinder, and a blade is provided on the cleaning brush shaft provided between the rotating rings on both ends or the shaft provided between the rotating rings. The aeration apparatus according to claim 1, claim 2, or claim 3.

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