KR101830068B1 - Air diffuser and water treatment apparatus comprising the same - Google Patents

Abstract

The present invention relates to aeration apparatus and a water treatment apparatus including the same. The air diffuser according to one aspect includes an air supply port for discharging air; And a plurality of air bubbles for diffusing and discharging the air introduced through the air supply port are formed in the air diffusing pipe, And an open portion formed along the longitudinal direction of the air diffusing pipe is provided on the lower side of the diffusing pipe.

Description

FIELD OF THE INVENTION [0001] The present invention relates to an air diffuser and a water treatment device including the air diffuser,

An embodiment of the present invention relates to an air diffuser and a water treatment apparatus including the same.

The air diffuser is for generating a large number of bubbles in water, and has an air inlet passage and a bubble discharge hole. The air diffuser is used for bubble generation in the aeration tank of the water treatment facility, bubble generation in the filtration tank of the filtration type water treatment facility, bubble generation in the bioreactor of the membrane bio-reactor (MBR) water treatment facility have.

The aeration tank of a water treatment facility is used to decompose organic matter contained in sewage, wastewater and sewage through the cultivation of aerobic microorganisms.

The filtration tank is used to remove the solid particles contained in the wastewater by filtration. The diffuser is installed in the bottom of the submerged membrane module in the filtration tank. The bubbles discharged from the air diffuser act as a driving force for disturbing the water body around the membrane module. The collision between the separator and the bubbles and the disturbance of the water around the separator cause vibrations to occur in the separator and thus the phenomenon that the micropores of the separator are clogged by the deposition of the solid particles (i.e., fouling ) Phenomenon "can be prevented.

In the bioreactor, the removal of solid particles by the membrane module and the decomposition of the organic matter by microorganisms occur at the same time.

The bubbles discharged from the air diffuser installed in the lower part of the bioreactor can serve to prevent fouling of the membrane and to supply oxygen to the microorganisms.

In the examples of the filtration tank and the bioreactor, prevention of fouling of the separation membrane by the bubbles discharged from the air diffuser is called "physical cleaning of the separation membrane by bubbles ". The most critical factor in the physical cleaning of the membrane by bubbles is the formation of a dead zone, which is extremely low in disturbance of the water body. Particularly, in the case of a bioreactor operated with a high concentration of microorganisms, if a dead zone is formed around the separation membrane, the membrane surface clogging due to the highly viscous microorganism solid rapidly proceeds, and the pressure difference across the separation membrane sharply increases.

The reason why the dead zone is formed around the separation membrane is that the amount of bubbles discharged from the bubble releasing hole of the diffuser is not uniform. This is called the short-circuit aeration phenomenon. If the generation of the bubbles acting as the driving force of the water body disturbance is not uniform, a dead zone with extremely low degree of disturbance of the water body inevitably forms in one region around the separation membrane.

On the other hand, Korean Patent Registration No. 10-0778491, which is a prior art document, discloses the content of " an air diffusing apparatus for aeration. &Quot;

In the case of the prior art document, there is a problem that the bubbles discharged through the plurality of bubble releasing holes are not uniformly discharged, and the manufacturing process is complicated. In addition, there may be a problem that the sludge accumulates inside the acid furnace and clogs up the acid furnace.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a diffusion device capable of uniformly discharging bubbles without accumulating sludge inside the device, and a water treatment apparatus including the same.

According to an aspect of the present invention, there is provided an air diffuser, comprising: an air supply port for discharging air; And a plurality of air bubbles for discharging the air introduced through the air supply port are formed in the air diffusing pipe, Is provided with an opening formed along the longitudinal direction of the air diffusing pipe.

The water treatment apparatus according to one aspect includes: a filtration tank for receiving wastewater; A filter module provided in the filtration tank and having a membrane for purifying the wastewater; And an air diffuser to generate air bubbles to prevent the membrane filter from being blocked, wherein the air diffuser includes an air supply port for discharging air; And a plurality of air bubbles for discharging the air introduced through the air supply port are formed in the air diffusing pipe, Is provided with an opening formed along the longitudinal direction of the air diffusing pipe.

According to the embodiment proposed in the present invention, bubbles can be uniformly discharged regardless of the distance from the air inlet in a plurality of bubble emitting holes.

In addition, since an air diffuser can be manufactured only by press working, the manufacturing process is simple, and the production time and manufacturing cost of the diffuser can be reduced accordingly.

1 is a perspective view of a water treatment apparatus according to a first embodiment of the present invention.
2 is a perspective view of the diffuser of Fig. 1;
Fig. 3 is a cross-sectional view of the diffuser of Fig. 2 taken along line I-I.
4 is a cross-sectional view of the diffuser of FIG. 2 taken along line II-II.
5 is a perspective view of a diffuser according to a second embodiment of the present invention.
Fig. 6 is a perspective view of the diffuser of Fig. 5;
FIG. 7 is a side view of the diffuser of FIG. 5; FIG.
Fig. 8 is a cross-sectional view of the diffuser of Fig. 5 taken along line I-I.
FIG. 9 is a cross-sectional view of the diffuser of FIG. 5 taken along line II-II.
10 is a perspective view of an air diffuser according to a third embodiment of the present invention.
11 is a perspective view of an air diffuser according to a fourth embodiment of the present invention.
12 is a cross-sectional view of the diffuser of FIG. 11 taken along line I-I.
13 is a perspective view of an air diffuser according to a fifth embodiment of the present invention.
14 is a plan view of the diffuser of Fig.
15 is a side view of the diffuser of Fig.
FIG. 16 is a front view of the diffuser of FIG. 13; FIG.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the difference that the embodiments of the present invention are not conclusive.

In describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected or connected to the other component, Quot; may be "connected," "coupled," or "connected. &Quot;

FIG. 1 is a perspective view of a water treatment apparatus according to a first embodiment of the present invention, FIG. 2 is a perspective view of an air diffuser of FIG. 1, FIG. 3 is a cross- 4 is a cross-sectional view of the diffuser of FIG. 2 taken along line II-II.

Referring to Figs. 1 to 4, a water treatment apparatus 1 according to a first embodiment of the present invention includes a filtration tank 5 and a diffuser 10.

The filtration tank 5 is for receiving wastewater, and the filtration tank may be provided with a purifying filter for purifying wastewater.

The purifying filter may include a membrane. The contaminants contained in the wastewater can be filtered by the membrane. The membrane may include a plurality of membranes, and the plurality of membranes may form a filter module.

On the other hand, the surface occlusion of the membrane due to contaminants may occur during the purification process by the membrane. In this case, the efficiency of water purification can be drastically reduced.

The diffuser (10) may emit bubbles to prevent surface clogging of the membrane.

The air diffuser (10) includes an air diffuser (100) and an air supply hole (11) for supplying air to the air diffuser (100).

The air diffuser 10 may further include an inlet 13 and connection pipes 14 and 15 for supplying air to the air supply port 11.

The connecting pipes 14 and 15 may include a central connecting pipe 14 and a branch connecting pipe 15 branching from one side of the central connecting pipe 14. The branch connecting pipe (15) can communicate with the central connecting pipe (14).

As shown, the branch connecting pipe 15 may be provided at the lower end of the central connecting pipe 14. However, the present invention is not limited to this configuration, and the branch connecting pipe 15 may be additionally provided on the side of the center connecting pipe 14.

The branch connection pipe 15 may be provided with a plurality of air supply ports 11 and the inlet port 13 may be provided at one side of the center connection pipe 14.

The air introduced into the inlet 13 through an external pump can be moved to the respective air supply ports 11 through the central connecting pipe 14 and the branch connecting pipe 15.

The air supply port 11 may be formed in the form of a nozzle, so that air can be uniformly supplied even when air is supplied over a wide range.

The air supply port 11 may be inserted into the internal space 18 of the air diffusing pipe 100 to supply air to the internal space 18 of the air diffusing pipe 100.

A plurality of bubble emitting holes 103 may be formed in the air diffusing pipe 100 to diffuse and discharge the air introduced through the air supplying holes 11.

The air diffuser (100) is disposed below the filter module, and the bubbles discharged from the bubble generator (103) rises to disturb the peripheral water bodies of the membrane provided in the filter module to prevent the membrane from being blocked can do.

The air diffuser 100 includes a pair of side plates 110 surrounding a side surface of the air supply port 11 and a front plate 120 connected to a front end of the pair of side plates 110 . The pair of side plates 110 may be connected to both sides of the front plate 120. Here, the direction in which the air is supplied by the air supply port 11 is defined as a forward direction, the gravity direction is defined as downward, and the opposite direction of gravity is defined as upward.

The pair of side plates 110 and the front plate 120 may have a flat shape.

The air diffuser 100 may include a protrusion 115 connected to an upper surface of the front plate 120 and an upper surface of the pair of side plates 110.

The protrusion 115 may be formed in an arch shape to roundly connect the pair of side plates 110 as shown in the figure. However, the present invention is not limited thereto.

Accordingly, the vertical cross-section of the air diffusing pipe 100 may have a U-shape with an opening downward as shown in FIG.

Further, a separate plate is not provided on the lower side of the front plate 120 and the lower side of the pair of side plates 110. That is, the lower surface of the front plate 120 and the lower surface of the pair of side plates 110 may be configured to form an opening 19.

The opening 19 may be formed along the longitudinal direction of the air diffuser 100. As shown in the figure, when the air diffuser 100 is provided in an elongated shape, the opening 19 may have a slit shape corresponding to the shape of the air diffuser 100.

The open portion 19 may have a width greater than the width of the air diffusing pipe 100. That is, the opening 19 may be formed over the entire lower surface of the air diffusing pipe 100.

Accordingly, the sludge contained in the wastewater contained in the filtration tank can be prevented from being clogged by accumulating the sludge in the aeration tube 100.

In addition, since the front plate 120 and the pair of side plates 110 forming the opening 19 are formed in a flat shape, there is no support surface for accumulating the sludge. Accordingly, the air diffuser 100 of the present invention can be regarded as having a structure in which the inner clogging due to the sludge does not easily occur.

In addition, since the lower end of the air diffuser 100 is completely opened, the air supply port 11 can be exposed to the outside of the diffuser 100. Accordingly, the air supply port 11 can be prevented from being clogged by the sludge.

On the other hand, in the case of a structure in which a hole is formed just below the air diffusing pipe as in the prior art, there is a difference from the present invention in that sludge is accumulated on the supporting surface around the hole, .

The plurality of bubble emitting holes 103 may be formed on the side surface of the air diffuser 100. That is, the plurality of bubble emitting holes 103 may be formed in the side plate 110. At this time, the plurality of bubble emitting holes 103 may be formed in the pair of side plates 110, respectively.

When the air bubbles are discharged by the air diffuser 100, the amount of air bubbles in the air bubbles from the air bubbles is reduced, The amount of bubbles to be discharged from the baffle 103 may be small. In this case, there may arise a problem that the surface occlusion of the membrane at a portion where the amount of bubble emission is small occurs.

Therefore, the plurality of bubble emitting holes 103 may be formed to increase in diameter as the bubble emitting holes 103 are further away from the air supply hole 11, so that the bubbles are uniformly discharged from the plurality of bubble emitting holes 103. That is, among the plurality of bubble emitting holes 103, the bubble emitting holes 103 arranged close to the air supply holes 11 are formed in the bubble emitting holes 103 arranged relatively far from the air supply holes 11 The diameter can be made smaller.

Accordingly, even if a relatively large amount of air is present in the portion adjacent to the air supply port 11, the diameter of the bubble discharge hole 103 is formed to be small and the amount of bubble discharge decreases. Even if the amount of air is relatively small, the bubble discharge hole 103 may have a large diameter, so that the bubble discharge amount may increase. Therefore, the bubbles can be uniformly discharged over the entire area in the plurality of bubble emitting holes 103 formed in the air diffusing tube 100.

In addition, the plurality of bubble emitting holes 103 may be formed as a two-tiered structure. In this case, the bubble emitting holes 103 provided on the upper side of the bubble emitting holes 103 arranged in a two-stage structure may be formed smaller in diameter than the bubble emitting holes 103 arranged on the lower side.

This is to uniformly discharge bubbles from all the bubble generating holes 103 in consideration of the phenomenon that the air in the internal space 18 of the air diffuser 100 is directed upward. Specifically, since the air in the inner space 18 of the air diffuser 100 is directed upward, and the amount of air is relatively large on the upper side, the diameter of the bubble discharge hole 103 provided on the lower side is set to be larger than the diameter of the bubble discharge hole 103 so as to uniformly discharge the bubbles. Thus, the effect of the acid generation can be maximized.

Meanwhile, the diameter of the plurality of bubble emitting holes 103 may be 3 mm to 7 mm.

Further, the distance between each bubble releasing hole 103 can be made shorter as the distance from the air supply port 11 is increased. That is, as the distance from the air supply port 11 increases, the air amount decreases, and the density of the bubble emitting hole 103 increases, so that bubbles can be uniformly generated in the entire region of the air diffuser 100.

On the other hand, the distance between the plurality of bubble emitting holes 103 may be 50 mm to 70 mm.

On the other hand, unlike the above, embodiments in which the plurality of bubble releasing holes 103 are formed in the projecting portions 115 are also possible.

The air diffuser 100 may be formed so that the width of the air diffuser in the vertical direction increases as the distance from the air supply port 11 increases. That is, d2 can be formed larger than d1 (see Fig. 3).

Specifically, the upper end of the upper body 100 may be formed to have an upward slope as the distance from the air supply port 11 increases. Accordingly, air can be uniformly dispersed in the internal space 18 of the air diffusing pipe 100, so that bubbles can be uniformly discharged from all the bubble releasing holes 103. In this case, the angle of upward inclination is not particularly limited.

Meanwhile, the upper end of the upper organ 100 may take the form of a curve like an arc or a parabola.

The air diffuser 100 may be manufactured by pressing a plate material. This is possible because the lower end of the air diffusing pipe 100 is opened.

On the other hand, since the conventional air diffuser is manufactured in the shape of a tube, it is difficult to manufacture the diffuser in a shape increasing in diameter from one side to the other side like the diffuser of the present invention. In order to manufacture a tube shape having a diameter increasing from one side to the other side, there is a disadvantage in that manufacturing time and manufacturing cost are increased because the plate material is rolled or expanded.

Since the acid furnace 100 according to the present invention can repeatedly produce a large quantity of products of equivalent quality using a press die and a press machine, the production time and production cost can be reduced.

Hereinafter, the air diffuser according to the second embodiment will be described.

Fig. 5 is a perspective view of a diffuser according to a second embodiment of the present invention, Fig. 6 is a perspective view of the diffuser of Fig. 5, Fig. 7 is a side view of the diffuser of Fig. Sectional view taken along line II-II in FIG. 5, and FIG. 9 is a cross-sectional view taken along line II-II in FIG.

5 to 9, the air diffuser 20 according to the second embodiment of the present invention includes an air supply port 21, an inlet port 13, connection pipes 14 and 15, . The diffuser diffuser 10 according to the second embodiment differs from the diffuser differs only in the diffuser 200 and the air supply port 21 and therefore a detailed description thereof will be omitted Omit it.

The air diffuser 200 of this embodiment includes a front plate 220 and a pair of side plates 210. The front plate 220 and the pair of side plates 210 may have a flat shape as in the previous embodiment.

A protrusion 213 formed to be rounded upward and plate portions 215 and 217 formed on both sides of the protrusion 213 may be provided on the upper part of the air diffusing tube 200. Bubbles release holes 213a, 215a, and 217a may be formed in the protruding portion 213 and the plate portions 215 and 217, respectively. The bubble releasing holes 213a formed in the protruding portions 213 are referred to as first bubble releasing holes 213a and the bubble releasing holes 215a and 217a formed in the plate portions 215 and 217 are referred to as a second bubble releasing hole 213a, The first bubble releasing hole 215a, and the third bubble releasing hole 217a.

The protruding portion 213 may be formed higher than the plate portions 215 and 217. Accordingly, the air supplied from the air supply port 21 can be collected below the protrusion 213.

In the internal space 21a of the air diffuser 200, two air supply openings 21 may be provided, but the present invention is not limited thereto.

The air diffuser 200 may have a shape in which the width in the vertical direction increases as the distance from the air supply port 21 increases. That is, d4 may be formed larger than d3 (see Fig. 8). Accordingly, the air is uniformly dispersed in the internal space 21a of the air diffusing tube 200, so that the bubbles can be uniformly discharged from all the bubble releasing holes 213a.

The heights of the end portions of the first to third bubble emitting holes 213a, 215a, and 217a may be uniform. Thereby, there is an effect that the height at which the bubbles are emitted from the respective bubble emitting holes 213a, 215a, and 217a becomes uniform.

At least one of the first to third bubble emitting holes 213a, 215a, and 217a may be disposed to be in direct contact with the air supply port 21.

The air diffuser 200 of this embodiment can be manufactured by press working a plate material as in the previous embodiment.

Also, the first to third bubble releasing holes 213a, 215a, and 217a may be formed by press working. Since a separate process for forming the bubble releasing holes is not required, the manufacturing process of the air diffuser 200 is simplified, and manufacturing time and manufacturing cost can be reduced.

Hereinafter, an air diffuser according to a third embodiment will be described. Since the air diffusing tube according to the third embodiment is different from the air diffusing tube according to the second embodiment only in the air bubble releasing hole, it will be described in detail, and a detailed description of the remaining constitution will be omitted.

10 is a perspective view of an air diffuser according to a third embodiment of the present invention.

10, the aeration engine 300 according to the third embodiment of the present invention has the same shape as the aeration engine 200 of the second embodiment. That is, the air diffusing pipe 300 of the present embodiment is provided with the projecting portion 313 and the plate portions 315 and 317, and each of the air diffusing holes 313a, 315a and 317a is provided.

However, the bubble emitting holes 313a, 315a, and 317a of this embodiment are not uniform in height, unlike the bubble emitting holes 213a, 215a, and 217a of the previous embodiment. Accordingly, the heights of the bubble discharge points can be different from each other.

Hereinafter, an air diffuser according to a fourth embodiment of the present invention will be described.

FIG. 11 is a perspective view of an air diffusing pipe according to a fourth embodiment of the present invention, and FIG. 12 is a cross-sectional view of the air diffusing pipe of FIG. 11 taken along line I-I '.

11 and 12, an air diffuser 400 according to a fourth embodiment of the present invention includes a front plate 420, a pair of side plates 410, and a plurality of protrusions 413, 415, and 417 .

A plurality of bubble emitting holes 413a, 415a, and 417a may be formed in the plurality of protrusions 413, 415, and 417, respectively.

The air introduced into the air diffusing pipe 400 through the air supply port 41 is supplied to the inside of the air diffusing pipe 400 through the air outlet 41 of each of the protrusions 413, And air collected at the lower ends of the projections 413, 415 and 417 can be dispersed and discharged through the plurality of bubble emitting holes 413a, 415a and 417a.

The air diffuser 400 may have a shape in which the width in the up-and-down direction increases as the distance from the air supply port 41 increases. That is, d6 may be formed larger than d5 (see Fig. 12). Accordingly, the air is uniformly dispersed in the internal space 41a of the air diffusing pipe 400 so that the bubbles can be uniformly discharged from all the bubble releasing holes 413a, 415a, and 417a.

Hereinafter, an air diffuser according to a fifth embodiment of the present invention will be described in detail.

13 is a perspective view of an air diffuser according to a fifth embodiment of the present invention, FIG. 14 is a plan view of the diffuser of FIG. 13, FIG. 15 is a side view of the diffuser of FIG. 13, FIG.

13 to 16, an air diffuser 500 according to a fifth embodiment of the present invention includes a front plate 520, a pair of side plates 510, and a plurality of protrusions 530, 540 and 550 .

The plurality of protrusions 530, 540, 550 may include a main protrusion 530 and an auxiliary protrusion 540, 550. The auxiliary protrusions 540 and 550 may be branched from the main protrusion 530.

The main protrusion 530 is provided on the upper side of the air diffusing pipe 500 and may be formed to be rounded upward.

The width of the main protrusion 530 in the left and right direction increases from one side 531 to the other side 533 of the air diffusing pipe 500. The main protrusion 530 may be inclined upward from one side 531 to the other side 533 of the air diffusing pipe 500.

The auxiliary protrusions 540 and 550 may be formed on a side surface of the main protrusion 530 and may have a width wider in the lateral direction as the protrusion 530 is further away from the main protrusion 530. The auxiliary protrusions 540 and 550 may be inclined upward as the main protrusions 530 are moved away from the main protrusions 530.

The auxiliary protrusions 540 and 550 may be provided on both sides of the main protrusion 530, respectively. The auxiliary protrusions 540 and 550 may include a first auxiliary protrusion 540 disposed on the left side of the main protrusion 530 and a second auxiliary protrusion 550 disposed on the right side of the main protrusion 530 have. The first auxiliary protrusion 540 and the second auxiliary protrusion 550 may be formed of a plurality of units.

The first auxiliary protrusion 540 and the second auxiliary protrusion 550 may be symmetrical to each other. That is, the first auxiliary protrusion 540 and the second auxiliary protrusion 550 may have the same shape. Therefore, the first auxiliary protrusion 540 will be mainly described below.

Bubble releasing holes 540a and 540b may be formed in the first auxiliary protrusion 540. The plurality of bubble emitting holes 540a and 540b may be provided. Also, a bubble releasing hole may be formed in the second auxiliary protrusion 550 as well. Although not shown, a bubble releasing hole may be formed in the main protrusion 530 as well.

Air flowing into the air diffuser through the air supply port may flow downwardly through the first protruding portion 540 and the first auxiliary protruding portion 540.

The air collected at the lower end of the first auxiliary protrusion 540 can be dispersed and discharged through the plurality of bubble emitting holes 540a and 540b.

The plurality of bubble emitting holes 540a and 540b may include a first bubble emitting hole 540a disposed relatively close to the main protrusion 530 and a second bubble emitting hole 540b disposed relatively far from the main protrusion 530. [ 540b. ≪ / RTI >

The first bubble releasing hole 540a and the second bubble releasing hole 540b may have the same height at their end portions.

Accordingly, the first auxiliary protrusion 540 is inclined upward as the main protrusion 530 moves away from the main protrusion 530, so that the second bubble releasing hole 540b, which is away from the main protrusion 530, The length of the first bubble emitting hole 540a may be shorter than the length of the first bubble emitting hole 540a. Accordingly, the height at which the bubbles are discharged from the first bubble releasing hole 540a and the second bubble releasing hole 540b is equalized.

As described above, according to the diffuser and the water treatment apparatus according to the embodiment of the present invention, bubbles can be uniformly discharged regardless of the distance from the air inlet in a plurality of bubble discharge holes. In addition, since an air diffuser can be manufactured only by press working, the manufacturing process is simple, and the production time and manufacturing cost of the diffuser can be reduced accordingly.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

Claims (14)

An air supply port for discharging air; And
And an air orifice through which the air discharged from the air supply port flows,
In the above diffuser,
A plurality of bubble releasing holes for dispersing and discharging the air introduced through the air supply port are formed,
A plurality of protrusions formed to be rounded upward are provided on the upper side of the diffuser,
Wherein the plurality of bubble releasing holes are formed in at least one of the plurality of protrusions,
Wherein the plurality of protrusions include a main protrusion disposed above the air supply port and a plurality of auxiliary protrusions extending from the main protrusion.
The method according to claim 1,
Wherein the diffuser is manufactured by pressing a plate material.
The method according to claim 1,
And an open portion formed along a longitudinal direction of the air diffusing pipe at a lower side of the diffusing pipe.
The method according to claim 1,
Wherein the main protrusion has a shape in which the air flow area increases as the distance from the air supply port increases,
Wherein the auxiliary protruding portion has a shape in which an air flow area increases with distance from the main protruding portion.
The method according to claim 1,
Wherein the main protruding portion is provided in a shape such that the width increases in a lateral direction from one side of the diffuser to the other side.
The method according to claim 1,
Wherein the main protrusions are formed in an inclined shape from one side to the other side of the air diffusing pipe.
The method according to claim 1,
Wherein the auxiliary protrusion is provided on a side surface of the main protrusion and is formed to be wider in the left-right direction as the main protrusion is further away from the main protrusion.
The method according to claim 1,
Wherein the auxiliary protrusions are formed in an inclined shape as the auxiliary protrusions are further away from the main protrusions.
The method according to claim 1,
Wherein the auxiliary protrusions are branched from the main protrusions and are provided on both sides of the main protrusions, respectively.
10. The method of claim 9,
In the auxiliary projection,
A first auxiliary protrusion provided on a left side of the main protrusion,
And a second auxiliary protrusion provided on the right side of the main protrusion,
Wherein the first auxiliary protruding portion and the second auxiliary protruding portion are each composed of a plurality of protrusions.
11. The method of claim 10,
Wherein the first auxiliary protrusion and the second auxiliary protrusion are provided in the same shape symmetrical to each other.
11. The method of claim 10,
A plurality of bubble releasing holes are formed in the first auxiliary protrusion and the second auxiliary protrusion,
Wherein the air introduced into the air diffuser through the air supply port flows through the main protruding portion to the first auxiliary protruding portion and the second auxiliary protruding portion and is discharged through the plurality of bubble releasing holes Aeration device.
13. The method of claim 12,
Wherein the plurality of bubble emitting holes include a first bubble emitting hole disposed adjacent to the main protruding portion and a second bubble emitting hole disposed farther from the main protruding portion than the first bubble emitting hole,
Wherein the first bubble releasing hole and the second bubble releasing hole are provided so that their end portions have the same height.
A filtration tank for receiving wastewater;
A filter module provided in the filtration tank and having a membrane for purifying the wastewater; And
And a diffusion device for generating bubbles to prevent the membrane filter from being blocked,
The air diffuser includes an air supply port for discharging air; And
And an air orifice through which the air discharged from the air supply port flows,
Wherein the air diffuser has a plurality of bubble releasing holes for dispersing and discharging the air introduced through the air supply holes,
An open portion formed along the longitudinal direction of the air diffusing pipe is provided on the lower side of the diffusing pipe,
A plurality of protrusions formed to be rounded upward are provided on the upper side of the diffuser,
Wherein the plurality of bubble releasing holes are formed in at least one of the plurality of protrusions,
Wherein the plurality of protrusions include a main protrusion disposed above the air supply port and a plurality of auxiliary protrusions extending from the main protrusion.

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