WO2022092610A1 - Air diffuser - Google Patents

Abstract

An air diffuser of the present invention comprises: an upper surface part having a buffer space formed therein, and having a plurality of air diffusion holes formed in the vertical direction and arranged on the outer side thereof so as to be alternated with each other in the longitudinal direction; a right surface part connected from one side of the upper surface part, and extended in the vertical direction; a left surface part which faces a front surface part, and which is connected to the upper surface part so as to be extended in the vertical direction; the front surface part which is formed at the end of the upper surface part in the longitudinal direction, and which has an air supply port formed at one side thereof; and a rear surface part, which faces the front surface part, is connected to the upper surface part, and has an air discharge hole formed at one side thereof.

Description

air diffuser

The present invention relates to an air diffuser. More specifically, the present invention relates to an aeration device installed under an immersion type separation membrane to prevent clogging of the separation membrane.

In the membrane filtration sewage and wastewater treatment process using an immersion type membrane, contaminants from the microbial reaction tank or raw water tank may adhere to the membrane surface or sludge may contaminate the membrane.

To prevent this, an aeration device is installed at the bottom of the separation membrane and air is injected to desorb the contaminants on the surface.

In general, the air diffuser is based on a circular pipe shape, and a plurality of holes are drilled at regular intervals so that the air bubbles are dispersed throughout the separation membrane.

To prevent sludge from accumulating in the pipe, a sludge discharge hole or elbow type pipe is added to the air diffuser device having a circular pipe shape. If the sludge is deposited in a part without a discharge hole and the pipe is long, the sludge can be removed by pushing it. There is a problem that it is difficult to supply enough air.

As a background related to the present invention, Korean Patent Application Laid-Open No. 10-2017-0104005 discloses an air diffuser, an operating method thereof, and a water treatment apparatus.

It is an object of the present invention to provide an aeration device installed under an immersion type separation membrane to prevent contamination of the separation membrane, and to form a buffer area in the upper part of the aeration device in which air can stay, so that air bubbles are uniformly distributed even when the air supply amount is reduced. It is intended to provide an aeration device that can be

In addition, it is possible to prevent clogging of the aeration pores by sludge during continuous aeration by adjusting the position of the aeration pores of the aeration device, and it is possible to reduce the increase rate of the transmembrane pressure (TMP) by preventing blockage of the separation membrane by uniform distribution of air bubbles. can

The above and other objects of the present invention can all be achieved by the present invention described below.

1. One aspect of the present invention relates to an air diffuser.

The diffuser includes a buffer space formed on the inside, and a plurality of diffuser holes perforated in the vertical direction on the outside of which are alternately arranged in the longitudinal direction; a right side portion connected from one side of the upper surface portion and extending in a vertical direction; a left side facing the right side, connected to the top side and extending in a vertical direction; a front portion formed at the longitudinal end of the upper surface portion and formed with an air supply port on one side; and a rear portion facing the front portion, connected to the upper surface portion, and having an air exhaust hole formed on one side.

2. In the first embodiment, the right-side portion and the left-side portion extending from the upper surface portion are in contact with the front portion and the rear portion and at least one surface to form a closed space inside, and the lower portion is opened to form an open surface can be

3. In the above 1 or 2 embodiments, the upper surface portion has a concave arc shape, and a buffer space in which the air supplied from the air supply port stays may be formed inside.

4. In any one of embodiments 1 to 3, the acid air hole may be disposed between 40 and 60° with respect to the central axis y passing through the uppermost end of the upper surface part.

5. In any one of the embodiments 1 to 4, the diffuser hole may be provided with a guide pipe extending outward from the upper surface to guide the air flow in the vertical direction.

6. In the 5th embodiment, the guide tube may be disposed at a height lower than the uppermost end of the upper surface part.

7. In any one of 1 to 6 above, the air supply port may be disposed at the lower end of the front part.

8. In any one of the embodiments 1 to 7, the air exhaust hole is disposed on the upper portion of the rear surface, and may be formed at a height equal to or higher than the diffuser hole with respect to the lower end surface.

9. In any one of 1 to 8 above, the diameter of the air supply port may be larger than the diameter of the air discharge hole.

10. In any one of the embodiments 1 to 9, an aerator that is spaced apart from the upper side of the upper surface part and intermittently generates air bubbles may be further disposed.

11. In any one of embodiments 1 to 10, the increase rate of the transmembrane pressure (TMP) is increased during continuous aeration of wastewater containing 6 to 10 g/L of mixed liquor suspended solids (MLSS). It can be less than 15%.

The present invention can prevent sludge accumulation in the aeration device, and provides a buffer space in the aeration device even when the air supply amount is reduced so that the bubbles are uniformly dispersed, and the air flow variation is reduced to prevent the aeration pores from being closed. can be effectively prevented.

In addition, it is possible to effectively prevent an increase in the transmembrane pressure due to clogging of the membrane by preventing fouling of the submerged membrane even during continuous aeration for a long time.

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

FIG. 2 is a plan view of the air diffuser according to FIG. 1 .

FIG. 3 is a front view of the air diffuser according to FIG. 1 .

4 is a rear view of the air diffuser according to FIG. 1 .

5 is a perspective view of an air diffuser according to another embodiment of the present invention.

FIG. 6 is a front view of the air diffuser according to FIG. 5 .

7 is a rear view of the air diffuser according to FIG. 5 .

8 is a schematic view showing the sludge accumulation direction according to the type of the air diffuser.

9 is a schematic diagram comparing the case in which a concave arc is provided on the upper surface of the air diffuser according to an embodiment of the present invention to show a buffer space in which air resides, and the case in which the air diffuser is formed at the top of the pipe type air diffuser.

10 is a schematic diagram showing air flow according to the angle of formation of the air diffuser in the pipe type diffuser.

11 is a schematic view showing the direction of perforation of the diffuser in the diffuser according to one embodiment of the present invention.

12 is a schematic diagram showing the configuration of an immersion type separation membrane module including an air diffuser according to an embodiment of the present invention.

13 is a graph showing the change in the transmembrane pressure (TMP) during continuous aeration in the air diffuser according to one embodiment of the present invention.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings. However, the following drawings are provided only to help the understanding of the present invention, and the present invention is not limited by the drawings. In addition, since the shape, size, ratio, angle, number, etc. disclosed in the drawings are exemplary, the present invention is not limited to the illustrated matters.

Like reference numerals refer to like elements throughout. In addition, in describing the present invention, if it is determined that a detailed description of a related known technology may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted.

When 'including', 'having', 'consisting', etc. mentioned in this specification are used, other parts may be added unless 'only' is used. When a component is expressed in the singular, cases including the plural are included unless otherwise explicitly stated.

In interpreting the components, it is construed as including an error range even if there is no separate explicit description.

When the positional relationship between two parts is described with ‘on’, ‘on’, ‘on’, ‘beside’, etc., unless ‘directly’ or ‘directly’ is used, between the two parts One or more other portions may be located.

Positional relationships such as 'upper', 'top', 'lower', and 'bottom' are only described based on the drawings, and do not represent absolute positional relationships. That is, the positions of 'upper' and 'lower' or 'upper surface' and 'lower surface' may be changed according to the observed position.

Hereinafter, an air diffuser according to an embodiment of the present invention will be described with reference to the drawings.

1 is a perspective view of an air diffuser according to an embodiment of the present invention, FIG. 2 is a plan view of the diffuser according to FIG. 1, FIG. 3 is a front view of the diffuser according to FIG. 1, and FIG. 4 is the above view It is a rear view of the diffuser according to 1 .

The diffuser 1000 includes an upper surface portion 100 , a right surface portion 200 , a left surface portion 300 , a front portion 400 , and a rear surface portion 500 .

The air diffuser 1000 is used to generate bubbles in a bioreactor equipped with a separation membrane in a water treatment facility using the membrane separation activated sludge method.

The air diffuser 1000 is disposed under the immersion-type separation membrane disposed in the bioreactor to physically clean the separation membrane by spraying air bubbles.

1 to 4 , the upper surface part 100 has a buffer space b formed on the inside, and a plurality of diffuser holes 110 perforated in the vertical direction on the outside are alternately arranged in the longitudinal direction.

The right side part 200 is connected from one side of the top surface part 100 and extends in a vertical direction.

The left side portion 300 faces the front portion 200 , and is connected to the top surface portion 100 to extend in a vertical direction.

The left side part 300 and the right side part 200 respectively extending from the upper surface part 100 are in contact with the front part 400 and the rear part 500 and at least one surface to form a closed space inside, and the lower part is opened to form an open surface.

The diffuser 1000 may have a length of 400 to 1,000 mm, and a width of 20 to 60 mm, preferably 25 to 50 mm.

The length of the diffuser 1000 may be changed according to the module size, but is not limited to the above range.

If the width of the diffuser 1000 is less than 20 mm, internal resistance increases and the diffuser effect may be reduced. If the width exceeds 60 mm, a larger amount of air is required for uniform diffusion, thereby reducing economic efficiency.

In one embodiment, the upper surface portion 100 has a curvature so that a concave arc is formed on the inside, and a buffer space in which the air supplied to the inside stays is formed.

When the upper surface portion 100 is curved to have a curvature and a concave arc is formed therein, a space is formed in which the air supplied into the air diffuser 1000 floats and stays in a certain amount.

The upper surface portion 100 may have a buffer space (b) formed therein, is not limited to an arc shape, and may be provided in a polygonal structure.

3 and 4, the upper surface part 100, the right side part 200, and the left side part 300 are connected to each other and, when viewed from the left or right, shows an inverted 'U' shape, and the lower part is open An open surface is formed.

8 is a schematic view showing the sludge accumulation direction according to the type of the aerator.

Referring to FIG. 8, (a) shows the sedimentation of sludge in the conventional pipe-type air diffuser, (b) shows the sludge sedimentation in the elbow-type pipe to which the pipe is connected, and (c) the reverse 'U' A ruler-shaped diffuser is shown.

The conventional pipe-type diffuser has a problem in that the sludge (s) gradually settles and eventually closes the sludge discharge hole, and even in the case of an elbow connected to a pipe, there is a problem in that the sludge is deposited in the bent portion.

In Fig. 8(c), in the case of an inverted 'U' shape, a continuously open lower surface is formed, and when the lower surface is completely opened while the air is discharged through the air diffuser hole 110 of the upper surface, the sludge is discharged from the diffuser. does not settle inside.

On the other hand, a buffer space in which the air supplied to the inside of the concave arc stays is formed.

9 is a schematic diagram comparing the case in which a concave arc is provided on the upper surface of the air diffuser according to an embodiment of the present invention to show a buffer space in which air is stored, and the case in which the diffuser hole 110 is formed at the top of the pipe type air diffuser. .

Referring to (a) of FIG. 9 , when a concave arc having a curvature is formed on the upper surface, the introduced air is trapped and stayed, and a buffer space (b) in which the air is collected is formed.

Referring to FIG. 9 (b), when the air introduced into the air diffuser is directly discharged from the air diffuser hole (c) to the uppermost end, when the air is close to the introduction site according to the air pressure at the introduction site, a large amount of air is discharged to increase the generation of bubbles. However, as the distance from the introduction site increases, the amount of air generated decreases because the air discharge decreases, making effective aeration difficult as a whole.

If it is not aerated by the uniformly dispersed air bubbles, the surface of the separation membrane disposed on the upper side of the aeration device is occluded due to adhesion of solid particles, and the transmembrane pressure (TMP) applied to the separation membrane increases.

The bubbles discharged from the diffusion pores are a driving force that disturbs the wastewater around the separation membrane, and it is a very important factor that the bubbles are uniformly generated to prevent the solid particles from being deposited in the micropores of the separation membrane by inducing collision of the separation membrane with the bubbles, If the bubbles are not uniform, the deposition of contaminants is accelerated.

When the buffer space (b) is formed, air stays inside the concave arc up to the position of the air diffuser hole 110, and when the amount of supplied air is further increased, air is discharged through the air diffuser hole 110 to generate air bubbles. Because it is created, uniform air distribution is possible.

The buffer space (b) has the advantage that continuous aeration is possible even during the rest period because the air already remaining is preferentially discharged to generate bubbles even when the amount of supplied air is reduced.

A diffuser hole 110 through which the supplied air is discharged in a vertical direction is disposed on the outside of the upper surface part 100 .

10 is a schematic diagram showing air flow according to the angle of formation of the diffuser hole 110 in the pipe type diffuser.

Referring to FIG. 10 , when the diffuser hole 110 is formed in the vertical direction at the uppermost end of the diffuser, the introduced air floats vertically and no interference with the air flow F ₂ occurs.

When the aeration hole 110 is formed in the vertical direction, there is no interference with the air flow F ₂ , and it is possible to delay the clogging of the aeration hole 110 by sludge settling in the lower part of the reactor, but at the top of the aeration device When the diffuser pores 110 are formed in the vertical direction, uniform air distribution is difficult when the amount of supplied air is reduced.

On the other hand, when the diffuser hole 110 is formed by being perforated at an angle of 60˚ with respect to the vertical direction (y) of the diffuser device, the discharged air flows through the air flow (F ₁ ) due to friction with the diffuser hole 110 rim. In the long term, the sludge in the reactor is deposited and clogging occurs.

It is very preferable that the diffuser hole 110 is perforated in a direction perpendicular to gravity.

11 is a schematic diagram showing the direction of perforation of the diffuser hole 110 in the diffuser device according to an embodiment of the present invention.

Referring to (a) of FIG. 11 , in one embodiment, the diffuse hole 110 may be disposed between 40 and 60° with respect to the central axis y passing through the uppermost end of the upper surface part 100 .

Specifically, the angle (θ) with respect to the central axis (y) with an imaginary line passing through the center of the diffuser hole 110 is 40 to 60 °.

When it does not reach the above range, the volume of the buffer space (b) is reduced and uniform air distribution is difficult. 110) is not easy to drill so that the direction is vertical.

Although the diffuser hole 110 is formed by being perforated in the vertical direction, referring to FIG. 11 ( b ), a guide tube 111 may be additionally disposed, and referring to FIG. It is also possible to form a perforation close to the.

Meanwhile, when air flows into the air diffuser 1000, it floats and stays inside the concave arc to form a buffer space.

In (a) of FIG. 11 , the buffer space b ₀ is formed from the inside of the uppermost end of the concave arc to the position where the diffuser hole 110 is formed, and in (b) the buffer space b ₁ is the lowest height of the guide tube 111 . , the buffer space is increased, and in (c), the buffer space (b ₂ ) may have the diffuser hole 110 located at the bottom of the upper surface part 100 , and in this case, the buffer space may be further increased.

The size of the volume of the buffer space may be b ₂ > b ₁ > b ₀ .

When the volume of the buffer space increases, even when the air supply amount is reduced, the amount of air capable of constantly discharging air increases, so that bubbles can be uniformly generated for a long time.

The diffused pores 110 are arranged to be alternated with each other in the longitudinal direction (x-axis direction).

Referring to FIG. 2 , the air gaps 110 are alternately arranged in the longitudinal direction and arranged in a zigzag manner.

The disposition of the diffuser hole 110 may be disposed on the left, right, or left and right sides of the central portion of the upper surface portion 100 .

When the diffuser pores 110 are arranged alternately with each other, it is effective for uniform air distribution, and since it is possible to minimize the influence of the air bubbles generated in the diffuser pores 110 to each other, the aeration effect can be increased.

The diameter of the acid air hole 110 is 3 to 10 mm, preferably 4 to 7 mm.

If the diameter of the diffuser hole 110 is less than 3mm, it may be easily blocked by sludge, and if it exceeds 10mm, it is difficult to expect a uniform diffuser effect.

One air hole 110 per 50 to 100 mm, preferably one per 70 to 100 mm, along the longitudinal direction of the upper surface part 100 may be disposed.

If the number of air gaps 110 per unit length is too large, the required air amount is increased.

11B and 3 , the diffuser hole 110 may be provided with a guide pipe 111 extending outward from the upper surface part 100 to guide the air flow in the vertical direction.

The guide tube 111 starts from the inside of the concave arc and extends to the outside of the upper surface part 100 .

When the guide tube 111 is provided, the air staying in the buffer space moves through the guide tube 111, which is very advantageous because the air flow is in a vertical direction.

The guide tube 111 may be disposed at a height lower than the uppermost end of the upper surface portion 100 .

The height (h ₀ ) to the uppermost end of the guide tube 111 is the height of the upper surface portion 100 based on the connection line (a) where the upper surface portion 100 is coupled to the front portion 200 and the rear portion 300. lower than (h ₁ ).

When the guide tube 111 is extended to a place higher than the uppermost end of the upper surface part 100, the guide tube 111 is long and not easy to install, and the flow of air is rather inhibited as the length of the guide tube 111 increases. and aeration is not performed smoothly to the outside of the upper surface part 100, so there is a risk that sludge may be deposited on the outer surface.

Referring to FIGS. 3 and 4 , the guide tube 111 has a shape protruding vertically from the upper surface portion 100 when viewed from the front portion 400 or the rear portion 500 .

The guide tube 111 protrudes outward from the upper surface portion 100, but is disposed lower than the uppermost height of the upper surface portion 100 and does not affect the flow of air.

The front portion 400 is formed at the longitudinal end of the upper surface portion 100, and an air supply port 410 is formed on one side.

The air supply port 410 introduces air generated by the blower (B) into the air diffuser.

The air supply port 410 is mainly disposed at the lower end of the front portion 400, but is not limited thereto.

When the air introduced through the air supply port 410 floats and it is easy to form the buffer space b, the position of the supply port is not limited.

However, when the air introduced into the air supply port 410 is discharged along the diffuser hole 110 as it is from the diffuser hole 110 closest to the air supply port 410 without passing through the buffer space b, the air supply It is necessary to adjust the position of the sphere 410 or the first diffuse pore.

The rear portion 500 faces the front portion 400 , is connected to the upper surface portion 100 , and has an air exhaust hole 510 formed on one side thereof.

The air outlet hole 510 is disposed on the upper portion of the rear portion 500, and may be formed at a height equal to or higher than the inner height of the diffuser hole 110 with respect to the lower end surface.

The air discharge hole 510 allows the air remaining in the air diffuser to be discharged to sufficiently wet the inside of the air diffuser when air supply to the air diffuser is stopped, such as during a rest period.

This wets the solidified sludge in the diffuser hole 110 during long-term operation, and can help to smoothly remove the fixed sludge when the air supply is resumed.

When the air discharge hole 510 is disposed on the rear surface portion 500 and is located opposite the air supply port 410, the air discharged through the buffer space and the remaining air can be discharged, so that the amount of bubbles generated can be adjusted.

In one embodiment, the diameter d ₁ of the air supply hole 410 may be greater than the diameter d ₂ of the air outlet hole 510 .

When the diameter of the air supply port 410 is larger, it is possible to effectively control the air inflow, and when the diameter of the air discharge hole 510 is larger than the air supply port 410, it is difficult to maintain the buffer space, and The flow is also difficult to keep constant.

5 is a perspective view of a diffuser according to another embodiment of the present invention, FIG. 6 is a front view of the diffuser according to FIG. 5, and FIG. 7 is a rear view of the diffuser according to FIG.

5 to 7 , the diffuser hole 110 may be formed by integrally molding the diffuser device in the vertical direction to the upper surface portion 100 .

When the air diffuser is integrally formed, the manufacturing efficiency is greatly increased, and the air diffuser hole 110 can be completed without drilling so that the air flow is in the vertical direction.

In one embodiment, an aerator 700 that is spaced apart from the upper side of the upper surface part and intermittently generates air bubbles may be further provided.

12 is a schematic diagram showing the configuration of an immersion type separation membrane module including an air diffuser according to an embodiment of the present invention.

Referring to FIG. 12 , an aerator 700 is provided above the upper surface part 100 of the air diffuser 1000 , and is disposed under the separation membrane 800 .

The aerator 700 may be designed so that the air bubbles generated by the aerator 1000 are introduced and maintained for a certain period of time and then discharged through the opening of the upper plate for a short time.

When the air diffuser 1000 is disposed under the aerator 700, there is an advantage that the cleaning process of the aerator is not required.

The aeration device may increase the transmembrane pressure (TMP) increase rate within 15% during continuous aeration for 129 days for wastewater containing 6 to 10 g/L of activated sludge suspended solids (MLSS).

In the diffuser device, the diffuser hole 110 is not easily blocked even during long-term operation by the diffuser hole 110 for discharging air in the vertical direction to the buffer space b, so that the aeration efficiency is increased due to the uniform generation of air bubbles, Since fouling of the separator is prevented, the increase rate of the transmembrane pressure is remarkably reduced.

Hereinafter, preferred examples are presented to help the understanding of the present invention, but the following examples are only illustrative of the present invention and the scope of the present invention is not limited to the following examples.

Example 1.

A total of 8 diffuser holes with a diameter of 4.5 mm were drilled in the vertical direction in the upper surface of the diffuser with a length of 800 mm and a width of 50 mm.

The air gaps were formed alternately in a zigzag pattern, and the horizontal distance from each air hole was set to 100 mm.

Comparative Example 1.

A pipe-shaped diffuser was formed by perforating 4 holes in the left 60˚ direction and 4 in the right 60˚ direction with a 3.5 mm diameter diffuser hole in a transparent pipe with a length of 800 mm and a diameter of 27 mm.

Comparative Example 2.

The pipe-type diffuser was formed by perforating 4 holes in the 60° left direction and 4 holes in the right 60° direction based on the vertical axis with a size of 4.5 mm.

Compared with Comparative Example 1, only the diameter of the acid pores was increased.

Experimental Example 1. Membrane occlusion test

Treatment capacity 120㎥/day, instantaneous flux 28-31 L/m2/hr, air volume 0.08-0.12 d Continuous aeration was performed without a separate washing process for the aerator under the condition of m3/m2/hr.

After continuous operation for more than 120 days or until the transmembrane pressure (TMP) of the separation membrane exceeded 30 kPa, the separation membrane was lifted and visually inspected. As a result of lifting the membrane after operation for 129 days, in Example 1, there was no blockage of the aeration device and the aeration hole, and no sludge was accumulated in the module including the aeration device.

It was confirmed that, in the air diffuser of Comparative Example 1, a large number of air aeration papers and air holes were blocked in the module, and sludge accumulation in the upper module of the blocked air aerator was confirmed.

It was confirmed that the air diffuser and air hole of Comparative Example 2 were partially blocked, and a small amount of sludge was accumulated in the module.

In the diffuser according to Example 1, it was confirmed that the aeration effect was very high because the diffuser and the diffuser were not blocked even during continuous aeration, so that the air bubbles were uniformly distributed.

Experimental Example 2. Continuous aeration

In order to confirm that uniform dispersion of air bubbles is performed during continuous aeration for a long time, the transmembrane pressure (TMP, kPa at 20 °C) of the separation membrane was continuously measured.

number of operating days Example 1 Comparative Example 1 Comparative Example 2 number of operating days Example 1 Comparative Example 1 Comparative Example 2 One 9.36 8.65 10.4 66 18.49 - - 2 10.61 8.82 10.6 67 18.96 - - 3 11.28 9.59 12.5 68 19.45 - - 4 12.11 10.54 13.5 69 19.72 - - 5 13.03 11.21 13.7 70 19.86 - - 6 13.52 11.39 13.8 71 19.3 - - 7 13.5 11.54 14.1 72 19.54 - - 8 12.93 13.39 - 73 19.72 - - 9 13.09 - - 74 20.28 - - 10 13.49 - - 75 20.36 - - 11 13.91 - 15.9 76 20.32 - - 12 14.13 - 16.3 77 19.85 - - 13 14.66 - 16.8 78 20.06 - - 14 14.37 13.96 17.2 79 20.09 - - 15 13.81 16.61 - 80 20.32 - - 16 14.13 19.67 - 81 20.88 - - 17 14.54 - 18.8 82 20.83 - - 18 15.24 - 19.3 83 20.99 - - 19 15.58 - 19.7 84 20.15 - - 20 15.56 22.23 20 85 20.24 - - 21 15.31 23.3 20.4 86 20.6 - - 22 15.72 24.28 - 87 20.72 - - 23 15.84 25.15 - 88 20.81 - - 24 16.33 26.88 19.9 89 21.18 - - 25 16.66 28.35 20.5 90 21.14 - - 26 17.23 - 20.2 91 20.6 - - 27 17.17 - - 92 20.79 - - 28 16.5 - 20.2 93 21.05 - - 29 16.62 - 19.9 94 21.6 - - 30 17.1 - 20.4 95 21.8 - - 31 17.42 - 24.3 96 22.07 - - 32 17.96 - 24.9 97 21.54 - - 33 18.16 - 25.1 98 21.28 - - 34 17.97 - - 99 21.29 - - 35 17.24 - - 100 21.56 - - 36 17.33 - 27.1 101 21.82 - - 37 17.65 - 27.4 102 21.75 - - 38 17.75 - - 103 21.1 - - 39 17.75 - 29.7 104 21.17 - - 40 17.75 - 30.1 105 21.06 - - 41 17.51 - - 106 21.01 - - 42 17.35 - - 107 20.61 - - 43 17.53 - - 108 21.06 - - 44 17.69 - - 109 21.55 - - 45 17.75 - - 110 21.86 - - 46 18.14 - - 111 22.21 - - 47 18.16 - - 112 21.92 - - 48 17.84 - - 113 22.08 - - 49 17.56 - - 114 22.35 - - 50 17.5 - - 115 22.62 - - 51 17.82 - - 116 22.62 - - 52 18.05 - - 117 22.62 - - 53 18.3 - - 118 22.62 - - 54 18.53 - - 119 21.42 - - 55 18.37 - - 120 21.81 - - 56 17.76 - - 121 22.22 - - 57 18.06 - - 122 22.26 - - 58 18.28 - - 123 22.46 - - 59 18.6 - - 124 22.76 - - 60 18.88 - - 125 22 - - 61 19.1 - - 126 22.16 - - 62 19.5 - - 127 22.46 - - 63 18.87 - - 128 22.91 - - 64 18.82 - - 129 22.74 - - 65 19.13 - -

Table 1 shows the results of measuring the transmembrane pressure of Example 1 and Comparative Examples 1 and 2.

13 is a graph showing the change in the transmembrane pressure (TMP) during continuous aeration in the air diffuser according to one embodiment of the present invention.

Referring to Table 1 and FIG. 13, it was confirmed that the increase rate of the transmembrane pressure (TMP) was within 15% even during continuous aeration for 129 days in the aeration device according to Example 1, effectively preventing contamination of the separation membrane due to air pore occlusion. did

In contrast, in Comparative Example 1, when the number of operating days exceeded 25, the transmembrane pressure was increased to 28.35 kPa, and the increase rate was also very high, and in Comparative Example 2, when the number of operating days exceeded 40 days, the transmembrane pressure was increased to 30.1 kPa. It was confirmed that contamination of the separation membrane could not be effectively prevented, and a separate washing step was required.

Therefore, the air diffuser according to one embodiment of the present invention induces the flow of air in the vertical direction to uniformly generate air bubbles, thereby increasing the aeration effect, and preventing sludge from accumulating and clogging the air diffuser. By forming a buffer space so that the air supplied to the inside stays constant first, air is continuously discharged even when the amount of air inflow is reduced, and uniform bubbles are generated in the aeration pores to prevent contamination of the separation membrane and during continuous aeration for a long period of time It can also have the effect of significantly lowering the increase in the transmembrane pressure.

Up to now, the present invention has been mainly examined in the examples. Those of ordinary skill in the art to which the present invention pertains will understand that the present invention can be implemented in modified forms without departing from the essential characteristics of the present invention. Therefore, the disclosed embodiments are to be considered in an illustrative rather than a restrictive sense. The scope of the present invention is indicated in the claims rather than the foregoing description, and all differences within the scope equivalent thereto should be construed as being included in the present invention.

Claims (11)

an upper surface portion having a buffer space formed on the inner side and having a plurality of diffused air holes perforated in the vertical direction on the outer side arranged alternately in the longitudinal direction; a right side portion connected from one side of the upper surface portion and extending in a vertical direction; a left side facing the front side and connected to the top side extending in a vertical direction; a front portion formed at the longitudinal end of the upper surface portion and formed with an air supply port on one side; and and a rear portion facing the front portion, connected to the upper surface portion, and having an air exhaust hole formed on one side. The method according to claim 1, wherein the right side portion and the left side portion extending from the upper surface portion are in contact with the front portion and the rear portion and at least one surface to form a closed space inside, and the lower portion is opened to form an open surface Characterized aeration device. The air diffuser according to claim 1 or 2, wherein the upper surface has a concave arc shape, and a buffer space in which the air supplied from the air supply port stays is formed inside. The diffuser device according to any one of claims 1 to 3, wherein the diffuser hole is disposed between 40 and 60° with respect to the central axis (y) passing the uppermost end of the upper surface part. [Claim 5] The diffuser device according to any one of claims 1 to 4, wherein the diffuser hole is provided with a guide pipe extending outward from the upper surface to guide the air flow in a vertical direction. The diffuser according to any one of claims 1 to 5, wherein the guide tube is disposed at a height lower than the uppermost end of the upper surface part. The diffuser according to any one of claims 1 to 6, wherein the air supply port is disposed at a lower end of the front part. The diffuser device according to any one of claims 1 to 7, wherein the air exhaust hole is disposed on the upper portion of the rear surface and is formed at a height equal to or higher than the diffuser hole with respect to a lower end surface. The diffuser according to any one of claims 1 to 8, wherein a diameter of the air supply port is larger than a diameter of the air discharge hole. The air diffuser according to any one of claims 1 to 9, further comprising an aerator that is spaced apart from the upper side of the upper surface and generates air bubbles intermittently. The method according to any one of claims 1 to 10, wherein the rate of increase in the transmembrane pressure (TMP) is increased during continuous aeration of wastewater containing 6 to 10 g/L of mixed liquor suspended solids (MLSS). Aeration device, characterized in that within 15%.

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