KR20100069898A - Multi-disk diffuser - Google Patents

Abstract

PURPOSE: A multi-stage diffuser is provided to efficiently prevent clogging of an air nozzle, and to supply microbubbles to a wide area with a bolt fastening part, a plurality of disks, a bolt and a nut etc. CONSTITUTION: A multi-stage diffuser(100) includes the following: a bolt fastening part(101) formed on the center; an air nozzle(105) in which a groove is formed to a constant size and an interval, and is adjacent to an air chamber; the air chamber(103) formed around the blot fastening part; a plurality of disks(110-150) of which exterior surfaces are formed to be inclined; a nut(160) formed on the exterior surface; and a nut(170) assembling the disks, and is combined to an end of the bolt. The size of the air nozzle is 0.1 ~ 0.8mm.

Description

Multi-stage diffuser {Multi-Disk Diffuser}

The present invention relates to an apparatus for efficiently supplying air and other gases to a process that requires dissolved oxygen, such as an aerobic reactor or fish farm, such as a wastewater treatment plant, a combined purification tank, an aerobic fermentation tank, and more specifically, an upper surface of a disk. A multi-stage acid generator that exposes a portion of the air nozzles formed on the outside of the disk to supply a large amount of uniform and fine bubbles to the aeration tank over a wide area to increase the concentration of dissolved oxygen and efficiently treat wastewater and wastewater. will be.

As the industrialization and urbanization continue today, environmental pollution is getting worse, and the discharged sewage, wastewater, and sewage shapes are also diversified, and the facilities for its treatment are being upgraded and treatment costs are also increasing.

Currently, biological treatment methods selectively combined with physical and chemical methods are mainly used for the treatment of wastewater and wastewater. Biological treatments can be broadly classified into aerobic treatment and anaerobic treatment.

Anaerobic treatment method does not require oxygen supply and has the advantage of obtaining combustible methane gas as energy, but has disadvantages such as long reaction period and generation of odor.

The aerobic treatment method has disadvantages such as energy requirement for oxygen supply, but occupies most of the current wastewater treatment process due to short reaction time and complete organic material removal.

In the aerobic treatment method, the supply of oxygen is essential for the growth and activity of aerobic microorganisms, which is used for this purpose.

The diffuser is installed inside the aeration tank, and maintaining the proper dissolved oxygen (DO) in the aeration tank is key. In the aeration tank, since the gas is present in the liquid waste and waste water in the dispersed phase, the bubble size, the amount of retention, the contact between the gas phase and the liquid phase, and the flow characteristics thereof have a significant influence on the operation conditions, performance, and efficiency of the aeration tank.

An efficient way to increase the gas-liquid contact area and increase the gas-liquid mass transfer coefficient in the aeration tank is to increase the amount of bubble retention, which is essential to reduce the size of the bubbles and to generate them uniformly.

Because in the aeration tank, the bubbles rise and merge with each other, because the rising speed of the bubbles increases in proportion to the size of the bubbles.

In other words, if the size of the bubble is large and the bubble is not uniformly generated, the residence time of the bubble in the aeration tank is shortened and the dissolved oxygen efficiency (SOTE, Standard Oxygen Transfer Efficiency) is reduced.

If an diffuser with excellent dissolved oxygen efficiency (SOTE) is developed, that is, if there is an diffuser that can be generated uniformly while reducing the size of the bubble, the number of diffusers mounted in the aeration tank can be reduced. Reduce installation costs

Due to the continuous urbanization and industrialization as described above, the discharged sewage, wastewater, and sewage shapes are very diverse, and facilities for the treatment thereof are also highly advanced and treatment costs are also increasing.

In the current wastewater treatment process, the power cost for maintaining proper dissolved oxygen (DO) in the aeration tank is a big part. If an diffuser with excellent dissolved oxygen efficiency (SOTE) is developed, that is, there is an diffuser capable of generating uniformly while reducing the size of the air bubbles, the number of air blowers and the uptime of the air blower can be reduced. By reducing the power costs can be significantly reduced.

If electricity costs can be reduced, it can contribute to the reduction of carbon dioxide gas, which not only raises the economic feasibility but also causes the greenhouse effect, which is emerging worldwide as an environmental issue.

Sewage water contains large amounts of organic and inorganic substances, which often lead to deterioration of the diffuser. In other words, the sludge is laminated to the outside of the air diffuser, it may interfere with the generation of bubbles, and due to the water pressure in the aeration tank, the waste and waste water flows back into the inside of the air diffuser to reduce the life of mechanical devices such as air blower do.

If a diffuser is developed to prevent this, economics can be improved by reducing the cost of replacing, maintaining, and replacing mechanical devices.

With the above background, the diffuser currently used will be described. If the existing diffuser is classified by type, it can be largely classified into a pipe type, a ball type, and a disk type.

Among the diffuser device, the existing disk type diffuser device has a problem that the capacity of the air blower must be increased in order to maintain a constant dissolved oxygen (DO) due to the problem of clogging pores by the stacking of the sludge and the pressure load. In addition, as the pores are enlarged with repeated use, the size of the bubbles is increased, thereby reducing the residence time of the bubbles in the aeration tank and reducing the dissolved oxygen efficiency (SOTE).

In order to solve the above problems, the applicant has developed a multi-stage diffuser device, which is disclosed in Korean Utility Model Registration No. 368391.

The multi-stage diffuser device disclosed in the Utility Model Registration No. 368391 is provided with a bolt fastening portion formed in the center and an air chamber formed around the bolt fastening portion, and an air nozzle grooved at a predetermined size and at a predetermined interval adjacent to the air chamber. Disks formed to be larger than the upper surface such that their outer surfaces are inclined; A bolt having a vent pipe; A nut for assembling the disks in combination with the bolts; The lower part is connected to the air inlet pipe, and the upper part is composed of a backflow prevention part provided with a ball inside a hemispherical container in which a disk having an air hole is coupled.

However, in the multi-stage diffuser device, since the lower surface of the disk located on the upper layer of the plurality of disks is in close contact with the air nozzle formed on the upper surface of the lower disk, the bubbles collected in the air chamber are lowered on the upper disk. Due to the effect of the bubble is not uniformly and minutely generated, that is, there is a problem that the bubble grows on the lower surface of the disk located in the upper layer. In addition, the problem that the air bubbles are not normally supplied due to the pressure load due to the stacking and inflow of the sludge occurred frequently, in this case, it has been difficult to maintain by removing the sludge by disassembling the multi-stage acid generator.

The present invention exposes a portion of the air nozzle formed on the upper surface of the disk to the outside, so that bubbles of uniform and fine size are supplied over a wide area to increase the contact area between the gas and the liquid in the aeration tank, and the material transfer efficiency between the gas and the liquid. It is an object of the present invention to provide a multi-stage diffuser device that can increase.

Another object of the present invention to provide a multi-stage diffuser device that can effectively prevent the clogging of the air nozzle by generating an elastic deformation of both ends of the disk when the air pressure rises due to the stacking or inflow of sludge.

Another object of the present invention is to provide a multi-stage diffuser device that can minimize the cost of the process of supplying bubbles to the aeration tank with a minimum pressure load.

In order to achieve the above object, the present invention is a bolt fastening portion is formed in the center, an air chamber is formed around the bolt fastening portion, the air nozzle grooved at a predetermined size and spacing adjacent to the air chamber is formed, A plurality of disks having a lower surface formed relatively larger than an upper surface and having an outer surface inclined; A bolt having a vent formed on an outer circumferential surface thereof; An diffuser having a nut coupled to an end of the bolt to assemble the disks, wherein the lower surface of the disk located on the upper layer of the plurality of disks is in close contact with the upper surface of the disk located on the lower layer. A portion of the air nozzle formed on the upper surface of the disk located in the lower layer in close contact with the lower surface of the disk is characterized in that it is exposed.

In the case of the present invention, the bubbles collected in the air chamber due to the partial exposure of the air nozzles are generated finely through the air nozzles.

The air nozzle is preferably formed in a size of 0.1 to 0.8mm.

In addition, the multi-stage diffuser device according to the present invention is at least one or more disks between the disk located on the top layer and the bottom layer of the plurality of disks made of a flexible material, when the pressure of air collected in the air chamber is high Both ends of the disk are elastically deformed by the pressure, thereby preventing clogging of the air nozzle.

According to the present invention and the multi-stage diffuser as described above, a part of the air nozzle formed on the upper surface of the disk is exposed, so that bubbles of uniform and fine size are supplied over a wide area so that the contact area between the gas and the liquid in the aeration tank is provided. And increase the mass transfer efficiency between the gas and the liquid.

In addition, when the air pressure rises due to the stacking or inflow of sludge, elastic deformation of both ends of the disk may be generated, thereby effectively preventing the clogging of the air nozzle.

In addition, since the bubble size can be generated uniformly, power costs can be considerably reduced by reducing the number of air blowers and the operating time of the air blower.

Hereinafter, with reference to the accompanying drawings an embodiment of the multi-stage device according to the present invention having the configuration as described above will be described in detail. However, the following examples are only for illustrating the present invention, and the present invention is not limited to the following examples and may be changed to other embodiments equivalent to substitutions and equivalents without departing from the technical spirit of the present invention. Will be apparent to those of ordinary skill in the art.

1 is a combined perspective view showing a multi-stage diffuser according to an embodiment of the present invention, Figure 2 is an exploded perspective view of Figure 1, Figure 3 is a longitudinal cross-sectional view of Figure 1, Figures 4a and 4b is a conventional multistage diffuser device And a cross-sectional view comparing the action of the multi-stage diffuser according to the embodiment of the present invention.

Referring to the drawings, the multi-stage diffuser device 100 according to an embodiment of the present invention is a plurality of disks (110-150) gradually smaller as the upper layer, and bolts 160 for fastening these disks (110-150) And a nut 170. The cover 111 is fastened to the upper portion of the disk 110.

In more detail, each of the plurality of disks 110-150 is formed such that its lower surface is relatively larger than its upper surface and its outer surface is inclined.

A bolt fastening portion 101 is formed at the center of the disk 110-150, and an air chamber 103 is formed around the bolt fastening portion 101.

An air nozzle 105 adjacent to the air chamber 103 and grooved at a predetermined size and spaced in the circumferential direction is formed.

Here, the air nozzle 105 has been found to be frequently blocked when the air nozzle 105 is smaller than 0.1 mm (blocking of the air nozzle) and difficult to form micro bubbles when the air nozzle 105 is larger than 0.8 mm, and the diameter of the air nozzle 105 is 0.1. It is most preferable to design to a size of 0.8 mm.

A vent 161 is formed on an outer circumferential surface of the bolt 160, and the nut 170 is coupled to an end of the bolt 160 to cover the cover 111 and the disks 110-150. Assemble and fasten. In addition, the lower portion of the nut 170 is directly connected to the air supply pipe or blower. In addition, the inside of the nut 170 may be provided with a backflow prevention means consisting of a ball, a sealing portion, etc., which is disclosed in the applicant's pre-registered utility model, detailed description thereof will be omitted.

Among the plurality of disks 110-150, the lower surface of the disk disposed on the upper layer is in close contact with the upper surface of the disk disposed on the lower layer, and the air nozzle 105 formed on the upper surface of the disk disposed on the lower layer is disposed on the upper layer. It is positioned to expose some.

In other words, since the lower surface of the disk located in the upper layer is in close contact with the upper surface of the disk located in the lower layer, and a part of the air nozzle 105 is opened, the air chamber may be exposed due to the exposure of the air nozzle 105. Bubbles gathered at 103 may be generated finely and uniformly through the air nozzle 105 without being affected by the lower surface of the disk located in the upper layer.

Referring to the operation of the multi-stage diffuser device according to an embodiment of the present invention configured as described above are as follows.

When air is injected from the air blower (not shown), the air rises through the vent 161 of the bolt 160. The elevated air is injected into the air chamber 103 of each disk 110-150 along the vent 161 of the bolt 160, and is supplied to the aeration tank through the air nozzle 105 only when a predetermined pressure or more is provided. The injected air continues to rise along the vent 161 of the bolt 160 until it reaches a certain pressure.

When the air is filled up to the air chamber 103 of the uppermost disk 110, the air of the air chamber 103 is supplied to the aeration tank through the air nozzle 105.

In the present invention, a portion of the air nozzle 105 formed on the upper surface of the disk is exposed to the outside of the disk, so that bubbles of uniform and fine size are supplied to the aeration tank without coalescence, thereby increasing the contact area between the gas and the liquid in the aeration tank. And the gas-liquid mass transfer efficiency can be continuously increased.

4A and 4B are cross-sectional views comparing the operation of the conventional multi-stage diffuser device (Utility Model Registration No. 368391 of the present applicant) and the multi-stage diffuser device according to the embodiment of the present invention.

As shown in FIG. 4A, in the case of the conventional multi-stage diffuser device 10, the entire air nozzle 5 formed on the upper surface of the disk located at the lower side of the disk 11-15 is completely removed. Since the cover is in close contact with the upper surface of the disk located in the lower layer, bubbles generated due to the influence of the lower surface of the disk located in the upper layer are not supplied as they are, but are supplied while being grown while being bonded to each other. In this case, the contact area between the gas and the liquid in the aeration tank is not increased, and the material transfer coefficient between the gas and the liquid is not increased.

On the other hand, in the multi-stage diffuser device 100 according to the embodiment of the present invention, as shown in Figure 4b, by collecting a portion of the air nozzle 105 formed on the upper surface of the disk to the outside, collected in the air chamber 103 Bubbles are not affected by the lower surface of the disk located above (disruption caused by the lower surface of the disk), minimizing the coalescence of bubbles and supplying a large amount of bubbles of uniform and fine size over a wide area, and gas-liquid in the aeration tank It is possible to increase the contact area between the liver and increase the material transfer efficiency between the gas and the liquid.

5 is a view for explaining the action of preventing the clogging of the air nozzle of the disk in the multi-stage diffuser device according to an embodiment of the present invention.

Referring to FIG. 5, in the multi-stage diffuser device 200 according to an embodiment of the present invention, at least one or more disks between the uppermost disk 210 and the lowermost disk 250 of the plurality of disks 210-250. Is made of flexible material. Here, the flexible material may be a rubber or synthetic resin material having elasticity.

As such, when at least one or more disks between the uppermost disk 210 and the lowermost disk 250 among the plurality of disks 210 to 250 are made of a flexible material, bubbles of air collected in the air chamber 203 may be formed. When the pressure is increased, as shown by the broken line by the pressure, both ends of the disk are elastically deformed upwards to effectively prevent clogging of the air nozzle 205.

As described above, according to the present invention, by exposing a portion of the air nozzle formed on the upper surface of the disk, bubbles of uniform and fine size are supplied in large quantities over a large area to increase the contact area between the gas and the liquid in the aeration tank. In addition, the gas-liquid transfer efficiency can be improved.

In addition, since the size of the bubble can be generated uniformly, the power cost can be significantly reduced by reducing the number of air blowers and the operating time of the air blower.

In addition, when the air pressure rises due to stacking or inflow of sludge, elastic deformation of the disk may be generated, thereby effectively preventing air clogging.

1 is a perspective view showing a multi-stage diffuser device according to an embodiment of the present invention.

2 is an exploded perspective view of the combination of FIG.

3 is a longitudinal cross-sectional view of FIG. 1.

4A and 4B are cross-sectional views comparing the operation of a conventional multistage diffuser with a multistage diffuser according to an embodiment of the present invention.

FIG. 5 is a view illustrating a multi-stage diffuser device according to an embodiment of the present invention, illustrating an operation of preventing clogging of an air nozzle of a disc.

Explanation of symbols for main parts

100: multistage diffuser

101: bolt connection

103: air chamber

105: air nozzle

110-150: multiple disks

111: cover

160: bolts

161: vent

170: nut

Claims (4)

A bolt fastening part is formed in the center, and an air chamber is formed around the bolt fastening part, and an air nozzle grooved at a predetermined size and interval is formed adjacent to the air chamber, and a lower surface is formed relatively larger than an upper surface thereof. A plurality of disks whose outer surfaces are formed to be inclined; A bolt having a vent formed on an outer circumferential surface thereof; An diffuser device having a nut coupled to an end of the bolt to assemble the disks, Among the plurality of disks, a lower surface of the disk located on the upper layer is in close contact with the upper surface of the disk located on the lower layer, and a part of the air nozzle formed on the upper surface of the disk located on the lower layer is in contact with the lower surface of the disk located on the upper layer. Multi-stage diffuser, characterized in that exposed. The method of claim 1, Multi-stage diffuser device characterized in that the bubbles are generated minutely through the air nozzle due to the partial exposure of the air nozzle. The method of claim 1, The air nozzle is a multi-stage diffuser device, characterized in that formed in the size of 0.1 to 0.8mm. The method according to any one of claims 1 to 3, At least one or more disks between the disk located on the uppermost layer and the disk disposed on the lowermost layer of the plurality of disks is made of a flexible material. When the air pressure increases, both ends of the disk are elastically deformed by the pressure, so that the air Multistage diffuser device, characterized in that to prevent clogging of the nozzle.

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