WO2015111948A1

WO2015111948A1 - Filtration device and air-dispersion unit for same

Info

Publication number: WO2015111948A1
Application number: PCT/KR2015/000711
Authority: WO
Inventors: 문희완
Original assignee: 코오롱인더스트리 주식회사
Priority date: 2014-01-27
Filing date: 2015-01-23
Publication date: 2015-07-30
Also published as: KR20150089195A

Abstract

Disclosed are: a filtration device which is able to minimise reduction in air-dispersion efficiency and consequent reduction in filtration efficiency caused by the settlement of detritus on the inside of an air dispersion tube; and an air-dispersion unit for same. The air-dispersion unit of the present invention comprises: a housing having an open floor section; and an air-dispersion tube which has a plurality of air-dispersion holes and is coupled to the upper part of the housing, and, here, the inner space of the housing and the hollow of the air-dispersion tube allow fluid through connection via the air-dispersion holes.

Description

Filter unit and diffuser for it

The present invention relates to a filtration device and an acid unit therefor, and more particularly, not only to ensure uniform acid cleaning of the filtration membrane module, but also to reduce the acid efficiency caused by the deposition of foreign matters inside the acid pipe. The present invention relates to a filtration device capable of minimizing a decrease in filtration efficiency and an acid base therefor.

Water treatment methods for removing contaminants from fluids and purifying them include heating or phase change and filtering membranes.

Since the desired water quality can be stably obtained according to the pore size of the filtration membrane, the method of using the filtration membrane has an advantage that the process reliability is higher than that of the method using heating or phase change. In addition, since the use of a filtration membrane does not require an operation such as heating, it is possible to prevent the microorganism from being affected by heat in the separation step using the microorganism.

One of the separation methods using a filtration membrane is a method using a hollow fiber membrane. Traditionally, hollow fiber membranes have been widely used in the field of precision filtration such as sterile water, drinking water, ultrapure water production, but recently, sewage / wastewater treatment, solid-liquid separation in septic tanks, removal of suspended solids (SS) from industrial wastewater, and river water Filtration, filtration of industrial water, filtration of swimming pool water, and the like have expanded their application ranges.

As the water treatment by the filtration membrane module proceeds, a fouling phenomenon of the filtration membrane is caused by contaminants, which causes a problem that the permeation performance of the filtration membrane is greatly decreased. Since various types of filtration membrane contaminants cause membrane contamination in different ways, various methods of cleaning contaminated filtration membranes are also required. Cleaning of contaminated filtration membranes can be classified into maintenance cleaning and recovery cleaning according to the cleaning purpose.

Recovery cleaning is a cleaning that is performed for a long time in the state of stopping the operation when the membrane permeation is accumulated and the membrane permeation performance of the filter membrane module is seriously degraded as the water treatment proceeds for a long time, and the main purpose is to restore the permeation performance of the filter membrane. have.

On the other hand, the maintenance cleaning is a cleaning performed while the water treatment by the filtration membrane module is in progress or while the water treatment is temporarily stopped. The main purpose is to maintain the permeation performance of the filtration membrane in a good state. This maintenance cleaning is mainly performed by physical cleaning. Physical cleaning can be categorized into backwashing and aeration schemes.

The backwashing method is a cleaning method that removes foreign matter adhering to the membrane surface by flowing air or water through the filter membrane while the water treatment is temporarily stopped.

On the other hand, the diffuser method is a cleaning method that ejects air from the diffuser during the water treatment operation so that the air bubbles rise. According to the diffuser method, not only the foreign matter adhering to the surface of the filtration membrane is removed by the air bubble itself but also the foreign matter on the surface of the filtration membrane by the rising or circulating water (in the water treatment tank or the housing) caused by the rising of the air bubble. Is removed.

The conventional filtration apparatus, as illustrated in FIG. 1, has a plurality of filtration membrane modules 20 which are immersed in raw water to be treated to perform water treatment, and an air diffuser disposed below the filtration membrane modules 20 in the raw water. Device 10.

The diffuser 10 includes a plurality of diffusers 12 and at least one common pipe 11 for supplying air to the diffusers 12.

The diffuser 12 is formed with a plurality of diffuser holes. For example, as illustrated in FIG. 2, the air holes H are formed in the upper surface of the diffuser 12, or as shown in FIG. 3, on both sides of the diffuser 12. The diffuser holes H1 and H2 are formed.

When the diffuser 12 blows air through the diffuser holes H, H1 and H2 while being immersed in the raw water together with the filtration membrane modules 20, the diffuser is temporarily stopped for energy saving. Raw water flows into the hollow of the diffuser 12 through the diffuser holes H, H1 and H2. The raw water contains various foreign matters, which are settled on the inner wall of the diffuser 12 and then harden to cause clogging of the diffuser 12.

If the diffuser 12 is clogged, not only the acid efficiency is lowered, but also the filtration efficiency of the filtration membrane itself is lowered. Therefore, the diffuser 12 needed to be replaced every relatively short period, which increased the cost of maintaining and repairing the filtration device. In addition, since the replacement of the diffuser 12 requires stopping the water treatment operation, there is a problem in that the efficiency of the overall water treatment operation is lowered.

Meanwhile, US Pat. No. 7,922,910 and Japanese Laid-Open Patent Publication No. 2003-154236 disclose an aerator having both sides having an open lower portion and an acid hole. However, since the acid holes in the acidic portion may also be directly exposed to raw water containing various foreign substances, clogging of the acid holes may be caused by the foreign substances. In addition, in the case of the acidic portions, since the lower part is open, air for acidic cleaning cannot be uniformly distributed in the entire internal space of the acidic portion, and as a result, the air cannot be uniformly provided to the filtration membrane modules, so that the filtration membrane Uniform cleaning of the module is not possible.

Accordingly, the present invention relates to a filtration apparatus and an air diffuser therefor that can prevent problems caused by the above limitations and disadvantages of the related art.

One aspect of the present invention not only ensures uniform acid washing of the filtration membrane module, but also prevents raw water containing foreign substances from flowing into the diffuser when the acid cleaning is temporarily stopped as well as during the acid cleaning. It is thereby to provide a filtration device that can minimize the decrease in the acid efficiency and the resulting decrease in filtration efficiency caused by the deposition of foreign matter inside the diffuser.

Another aspect of the present invention is not only to ensure uniform acid washing of the filtration membrane module, but also to prevent the inflow of raw water containing foreign substances into the diffuser when the acid cleaning is temporarily stopped as well as during the acid cleaning. As a result, it is to provide an acid moiety which can minimize the deterioration of the acidic efficiency caused by the deposition of foreign matters inside the acid pipe and the deterioration of the filtration efficiency.

In addition to the aspects of the present invention mentioned above, other features and advantages of the present invention will be described below, or from such description will be apparent to those skilled in the art to which the present invention pertains.

According to one aspect of the present invention as described above, a plurality of filtration membrane modules immersed in raw water to be treated to perform water treatment; And an diffuser disposed below the filtration membrane modules in the raw water, the diffuser comprising: a plurality of diffuser portions; And a common pipe for supplying air to the diffusers, each of which includes: a housing having an open bottom portion; And an diffuser having a plurality of diffuser holes and coupled to a top portion of the housing, wherein an inner space of the housing and a lumen of the diffuser are fluidized through the diffuser holes. A filtration device is provided, characterized by communicating.

The filtration device may further include a frame structure in which the filtration membrane modules and the diffuser are mounted, and air may be supplied to the common pipe through at least a portion of the frame structure.

According to another aspect of the invention, the housing having an open bottom; And a diffuser having a plurality of diffuser holes and coupled to an upper portion of the housing, wherein the diffuser portion is provided in fluid communication with the internal space of the housing and the hollow of the diffuser.

The housing may include a pair of side walls extending along the longitudinal direction of the housing, and the side walls may have a plurality of grooves thereunder.

Each of the diffuser portions may further include a plurality of partition walls that partition an inner space of the housing into a plurality of sections arranged in a line along the longitudinal direction of the housing.

The housing may include a pair of sidewalls extending along the longitudinal direction of the housing, the sidewalls may have a plurality of grooves thereunder, and at least one of the grooves may be disposed in each of the sections.

Each of the sections may be in fluid communication with the hollow of the diffuser through at least one diffuser hole.

The general description of the present invention as described above is only for illustrating or explaining the present invention, and does not limit the scope of the present invention.

According to the present invention, it is possible not only to guarantee uniform acid washing of the filtration membrane module, but also to prevent acid from being introduced into the diffuser by restraining raw water containing foreign matters during the acid cleaning, as well as when the acid cleaning is temporarily stopped. It is possible to minimize the decrease in acid efficiency and the decrease in filtration efficiency caused by the deposition of foreign substances inside the engine.

In addition, other features and advantages of the present invention may be newly understood through practice of the present invention.

The accompanying drawings are included to assist in understanding the present invention and to form a part of the specification, to illustrate embodiments of the present invention, and to explain the principles of the present invention together with the detailed description of the invention.

1 is a perspective view schematically showing a filtration device of the prior art,

2 and 3 are cross-sectional views of the diffuser along the line II ′ of FIG. 1,

4 is a perspective view schematically showing the filtration device of the present invention,

5 is a top perspective view of an air diffuser according to an embodiment of the present invention;

6 and 7 are cross-sectional views of the diffuser along the line II ′ of FIG. 5;

8 and 9 are a bottom perspective view and a bottom view of the diffuser according to another embodiment of the present invention,

10 is a perspective view of a filtration device according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings will be described in detail the embodiments of the filtration device and the acid for the same according to the present invention.

The term "filtration membrane" as used herein is a concept that includes both hollow fiber membranes and flat membranes.

4 is a perspective view schematically showing the filtration device of the present invention.

As illustrated in FIG. 4, the filtration device of the present invention is a plurality of filtration membrane modules 20 which are immersed in raw water to be treated to perform water treatment, and an diffuser disposed below the filtration membrane modules 2 in the raw water. Device 100.

The diffuser 100 includes a plurality of diffusers 120 and a common pipe 110 for supplying air to the diffusers 120. 4 illustrates an diffuser device 100 including a pair of common pipes 110 connected to one end and the other ends of the diffuser parts 120 in common, respectively. ) May have only one common pipe 110 that is commonly connected to one ends of the diffusers 120. In this case, the other ends of the diffusers 120 are blocked.

Hereinafter, the diffuser 120 according to an embodiment of the present invention will be described in more detail with reference to FIGS. 5 to 7. 5 is a top perspective view of the diffuser 120 according to an embodiment of the present invention, and FIGS. 6 and 7 are cross-sectional views of the diffuser 120 along the line II ′ of FIG. 5.

Each of the diffusers 120 of the present invention includes a housing 121 having an open bottom portion and an diffuser 122 coupled to a top portion of the housing 121. do.

The bottom of the housing 121 means a part of the housing 121 located on the opposite side of the filtration membrane modules 20, and the top of the housing 121 is a part of the housing 121 located on the opposite side of the bottom. Means. The housing 121 further includes a pair of side walls, a front wall, and a rear wall.

The pair of side walls extend along the longitudinal direction of the housing 121. The front wall and the rear wall are coupled to the top and side walls of the housing 121 at one end and the other end of the diffuser 122, respectively.

As described above, the diffuser 122 is coupled to the upper portion of the housing 121. For example, by forming a groove corresponding to the diffuser 122 in the upper portion of the housing 121, inserting the diffuser 122 in the groove and performing a welding or the like method and the housing 121 and The diffuser 122 may be integrally coupled.

An inner space of the housing 121 is formed by a portion of the diffuser 122, an upper portion of the housing 121, a pair of sidewalls, a front wall, and a rear wall.

The diffuser 122 has a plurality of diffuser holes H at a lower portion thereof, and an inner space of the housing 121 and a lumen of the diffuser 122 may allow the diffuser holes H to be provided. Fluid communication through.

According to the air diffuser 120 of the present invention, an air layer is formed in the internal space of the housing 121 by air supplied through the air diffuser hole H during the air freshener cleaning, and immediately after the entire internal space is filled with air. The air rises out of the internal space and rises up in the raw water to clean the filtration membrane.

When the air purifier is temporarily stopped for energy saving, raw water flows into the inner space of the housing 121 to some extent. Although the volume is slightly reduced due to the inflow of raw water, since the air layer still exists in the inner space of the housing 121, the raw water may be prevented from entering the diffuser hole H through the diffuser hole H. .

According to an embodiment of the present invention, as illustrated in FIG. 5, the sidewalls of the housing 121 may have a plurality of grooves G at the bottom thereof.

Referring to FIG. 6, an air layer is formed in the inner space of the housing 121 by air supplied through the air diffuser hole H during the air freshener cleaning. As the volume of the air layer increases and reaches the grooves G, air escapes from the inner space through the grooves G and rises toward the filtration membrane module.

On the other hand, as illustrated in FIG. 7, when the air purifier is temporarily stopped for energy saving, raw water flows into the inner space of the housing 121 above the height of the grooves G, but the Since the air layer still exists in the inner space, the inflow of raw water into the diffuser 122 through the diffuser hole H can still be prevented.

According to one embodiment of the present invention as described above, by forming a plurality of grooves (G) in the lower sidewalls of the housing 121, it is possible to adjust the supply position of air for filtration membrane cleaning. That is, since the air to be used for cleaning the filtration membrane can substantially escape the internal space of the housing 121 through the grooves G, the uniformly formed grooves G can ensure uniform acid washing.

Hereinafter, the diffuser according to another embodiment of the present invention will be described in detail with reference to FIGS. 8 and 9. 8 and 9 are a bottom perspective view and a bottom view of the diffuser according to another embodiment of the present invention.

As illustrated in FIGS. 8 and 9, the diffuser 120 according to another embodiment of the present invention may include a plurality of sections arranged in a line along the longitudinal direction of the housing 121. It may further include a plurality of partitions 123 partitioning the internal space. Sidewalls of the housing 121 have a plurality of grooves G at the bottom thereof.

Optionally, at least one groove G may be disposed in each of the sections in order to uniformly supply air for the acid cleaning to the filtration membrane module 20, each of the sections being at least one of the diffusers. The hole H may be in fluid communication with the hollow of the diffuser 122. Specifically, the partition walls 123 prevent the air blown out from the diffuser 122 through the specific diffuser hole H to move to sections other than the section corresponding to the diffuser hole H. In addition, since the feed is supplied to the filtration membrane module 20 only through the groove G disposed in the corresponding section, the uniformity of the acid cleaning can be further improved.

Hereinafter, a filtration device according to an embodiment of the present invention will be described in detail with reference to FIG. 10. 10 is a perspective view of a filtration device according to an embodiment of the present invention.

As illustrated in FIG. 10, a filtration device according to an embodiment of the present invention is an immersion type filtration device which performs filtration in a state immersed in raw water to be treated, and includes a frame structure 300 and the frame structure 300. It includes a hollow fiber membrane module 200 and the diffuser device (100) to be respectively. Air may be supplied to the common pipe 110 of the air diffuser 100 through at least a portion of the frame structure 300.

The hollow fiber membrane module 200 may include a first header 210 having an elongated shape having a first collecting part, a second header 220 having an elongated shape having a second collecting part, and the first and second parts. And hollow fiber membranes 230 between the two

headers

210 and 220. The hollow fiber membranes 230 are in fluid communication with the first and second collecting portions, respectively.

The polymer resin that can be used to manufacture the hollow fiber membrane 230 is polysulfone resin, polyethersulfone resin, sulfonated polysulfone resin, polyvinylidene fluoride (PVDF) resin, polyacrylonitrile (PAN) resin, poly At least one of a mid resin, a polyamideimide resin, and a polyesterimide resin.

The hollow fiber membrane 230 may be in the form of a single membrane or a composite membrane. When the hollow fiber membrane 230 is in the form of a composite membrane, the hollow fiber membrane 230 may include a tubular braid and a polymer thin film coated on a surface thereof. The tubular braid may be made of polyester or nylon, and the polymer thin film may be made of polysulfone resin, polyethersulfone resin, sulfonated polysulfone resin, polyvinylidene fluoride resin, polyacrylonitrile resin, polyimide resin, At least one of a polyamideimide resin and a polyesterimide resin.

One end of the hollow fiber membrane 230 is fixed to the body 211 of the first header 210 through a first pinned layer (not shown), and the other end thereof is second header 220 through the second pinned layer 222. It is fixed to the body 221 of the.

The lumen of the hollow fiber membrane 230 is in fluid communication with the first and second collecting portions of the first and

second headers

210 and 220. Thus, the first and second headers 210, through which the permeate that has passed through the hollow fiber membrane 230 by the negative pressure provided in the hollow of the hollow fiber membrane 230, through the hollow of the hollow fiber membrane 230, After entering the first and second water collecting portions of the 220, it is discharged through the first and

second discharge pipes

213 and 223.

Optionally, only one of the first and

second headers

210 and 222 may have a catchment unit.

In addition, the hollow fiber membrane module 200 may be composed of only the first header 210 and the hollow fiber membranes 230 having a first collecting portion. In this case, one end of the hollow fiber membrane 230 may be in fluid communication with the first collecting part and the other end thereof may be sealed.

Meanwhile, as illustrated in FIG. 10, the frame structure 300 according to an embodiment of the present invention includes four

vertical members

311 and 312 and three

cross members

321, 322 and 323. .

The

vertical members

311 and 312 include two front vertical members 312 and two rear vertical members 311, each of which is a hollow fiber membrane module 200 mounted in the frame structure 300. It has a longitudinal direction parallel to the hollow fiber membrane 230.

The

cross members

321, 322, 323 include a front cross member 323 and two

rear cross members

321, 322. The front cross member 323 is supported by them by directly engaging the two front vertical members 312, each of the

rear cross members

321, 322 being the two rear vertical members 311. Supported by them directly by The

cross members

321, 322, and 323 have longitudinal directions perpendicular to the first and

second headers

210 and 220 and the hollow fiber membrane 230 of the hollow fiber membrane module 200, respectively.

The

rear cross members

321 and 322 may include a rear upper cross member 321 and a rear lower cross member 322 corresponding to the first header 210 and the second header 220 of the hollow fiber membrane module 200, respectively. ).

The rear upper cross member 321 is a pipe communicating with the first collecting part of the first header 210 of the hollow fiber membrane module 200. In detail, the first discharge pipe 213 of the first header 210 is inserted into the fastening hole 321a of the rear upper cross member 321 so that the first header 210 is connected to the rear upper cross member 321. ) And at the same time the first collecting portion of the first header 210 is in fluid communication with the rear upper cross member 321. Similarly, the rear lower cross member 322 is also a pipe providing a fluid passage, and the second discharge pipe 223 of the second header 220 is inserted into the fastening hole 322a of the rear lower cross member 322. When the second header 220 is supported by the rear lower cross member 322, the second collecting part of the second header 220 is in fluid communication with the rear lower cross member 322.

Each of the two rear vertical members 311 is a pipe in fluid communication with the rear upper cross member 321 and the rear lower cross member 322. Therefore, after the filtered water passing through the hollow fiber membrane 230 by the negative pressure provided in the hollow of the hollow fiber membrane 230 flows into the first and second collecting portions of the first and

second headers

210 and 220 The first and

second discharge pipes

213 and 223 are transferred to the rear upper cross member 321 and the rear lower cross member 322, and the discharge ports 311a of the rear vertical members 311 are opened. Through the outside.

Optionally, one of the two rear vertical members 311 (hereinafter referred to as a 'first rear vertical member') is a pipe in fluid communication with the rear upper cross member 321 and the two rear vertical members. The other one of the fields 311 (hereinafter, referred to as a second rear vertical member) may be a pipe in fluid communication with the rear lower cross member 322. Therefore, the filtered water introduced into the first collecting part of the first header 210 of the hollow fiber membrane module 200 passes through the rear upper cross member 321 and the first rear vertical member sequentially and then discharges to the outside of the filtration apparatus. do. On the other hand, the filtered water flowing into the second collecting portion of the second header 220 of the hollow fiber membrane module 200 passes through the rear lower cross member 322 and the second rear vertical member sequentially and then discharges to the outside of the filtration apparatus. do.

Optionally, one of the two

rear cross members

321, 322 is not a pipe providing a fluid passage and corresponding one of the first and

second headers

210, 220 of the hollow fiber membrane module 200. It can also simply support the header. In this case, the header corresponding to the rear cross member which performs only a simple supporting function may not have a catch therein, and both or both of the two rear vertical members 311 may provide the filtrate passage. It may be a pipe that engages in fluid communication with the rear cross member.

The frame structure 300 may further include

horizontal members

331 and 332 having lengthwise directions parallel to the first and

second headers

210 and 220 of the hollow fiber membrane module 200. According to an embodiment of the present invention, the

horizontal members

331 and 332 include upper horizontal members 331 and lower horizontal members 332 positioned below them. Each of the

horizontal members

331 and 332 has one of the front vertical members 321 at both ends thereof to maintain a constant distance between the front vertical members 312 and the rear vertical members 311. And are directly coupled to one of the rear vertical members 311, respectively.

An air diffuser 100 is mounted on the frame structure 300 to be positioned below the hollow fiber membrane module 200.

At least one of the front vertical members 312 is a pipe in fluid communication with the diffuser 100, providing a passage for air to be supplied to the diffuser 100. The front cross member 323 is a pipe in fluid communication with the front vertical member (s) 312 that provides a passage for air to be supplied to the diffuser 100.

According to an embodiment of the present invention, all of the front vertical members 312 provide a passage for air to be supplied to the air diffuser 100 as pipes in fluid communication with the air diffuser 100, and the front The cross member 323 is a pipe in indirect fluid communication with the diffuser 100 via the two front vertical members 312. In this case, air for cleaning the hollow fiber membrane 230 is sequentially provided through the front cross member 323 and the front vertical members 312 and then provided to the diffuser device 100.

Optionally, the frame structure 300 may further include an air pipe 340 in fluid communication with the front cross member 323 to provide air to the front cross member 323. In this case, the air introduced into the air pipe 340 through the inlet port 341 passes through the front cross member 323 and the front vertical members 312 sequentially and is provided to the diffuser 100. .

Meanwhile, the diffuser device 100 includes a common pipe 110 and a plurality of diffuser portions 120 in fluid communication with at least one of the front vertical members 312. The common pipe 110 distributes the air supplied from the front vertical member (s) 312 to the plurality of diffusers 120.

According to an embodiment of the present invention, the diffuser device 100 includes two common pipes 110, and both ends of each of the common pipes 110 are perpendicular to one of the front vertical members 321 and the rear vertical. Directly engaging each one of the members 311 can maintain a constant gap therebetween. In this case, the lower horizontal members 332 that perform the same function may be omitted.

Frame structure 300 of the present invention, as illustrated in FIG. 10, includes at least one

cross bar

324, 325. The hollow fiber membrane module 200 has the frame structure in such a manner that the longitudinal direction of the

headers

210 and 220 and the longitudinal direction of the hollow fiber membrane 230 are perpendicular to the longitudinal directions of the cross bars 324 and 325, respectively. And mounted within 300.

When the hollow fiber membrane module 200 is composed of only the first header 210 and the hollow fiber membranes 230 having a first collecting portion, one end of the hollow fiber membrane 230 is in fluid communication with the first collecting portion. The other end thereof is sealed, and the frame structure 300 may include only one cross bar 325.

On the other hand, when the hollow fiber membrane module 200 includes two

headers

210 and 220 and the hollow fiber membranes 230 therebetween, as illustrated in FIG. 10, the frame structure 300 has two values. Cross bars ie an upper cross bar 325 and a lower cross bar 324.

The upper cross bar 325 is coupled to the lower portion of the front cross member 323. Optionally, the upper cross bar 325 may also be directly coupled to the front vertical members 312. The opposite side of the first discharge pipe 213 of the first header 210 of the hollow fiber membrane module 200 is fastened to the upper cross bar 325.

The lower cross bar 324 is directly coupled to the two front vertical members 312. A portion opposite to the second discharge pipe 223 of the second header 220 of the hollow fiber membrane module 200 is fastened to the lower cross bar 324.

That is, according to an embodiment of the present invention, the first and

second discharge pipes

213 and 223 of the first and

second headers

210 and 220 may include the rear upper cross member 321 and the rear lower cross member. The first and

second outlet pipes

213 and 223 of the first and

second headers

210 and 220 are inserted into the

fastening holes

321a and 322a of the 322, respectively. The hollow fiber membrane module 200 is mounted in the frame structure 300 by being fastened to the 325 and the lower cross bar 324, respectively.

Claims

A plurality of filtration membrane modules immersed in raw water to be treated to perform water treatment; And

An air diffuser disposed below said filtration membrane modules in said raw water,

The diffuser,

Multiple diffusers; And

It includes a common pipe for supplying air to the diffusers,

Each of the diffusers,

A housing having an open bottom portion; And

A diffuser having a plurality of diffuser holes and coupled to a top portion of the housing,

And an inner space of the housing and a lumen of the diffuser are in fluid communication with the diffuser holes.
The method of claim 1,

The filtration device further includes a frame structure in which the filtration membrane modules and the air diffuser are mounted.

Filtration device, characterized in that the air is supplied to the common pipe through at least a portion of the frame structure.
The method of claim 1,

The housing includes a pair of side walls extending along the longitudinal direction of the housing,

And the side walls have a plurality of grooves in the bottom thereof.
The method of claim 1,

Each of the diffusers further comprises a plurality of partitions partitioning the inner space of the housing into a plurality of sections arranged in a line along the longitudinal direction of the housing.
The method of claim 4, wherein

The housing includes a pair of sidewalls extending along the longitudinal direction of the housing,

The sidewalls have a plurality of grooves thereunder;

At least one groove is disposed in each of the sections.
The method of claim 5,

And each of said sections is in fluid communication with a hollow of said diffuser through at least one diffuser hole.
A housing having an open bottom; And

A diffuser having a plurality of diffuser holes and coupled to an upper portion of the housing,

And an inner space of the housing and the hollow of the diffuser are in fluid communication with the diffuser holes.
The method of claim 7, wherein

The housing includes a pair of sidewalls extending along the longitudinal direction of the housing,

And the sidewalls have a plurality of grooves at the bottom thereof.
The method of claim 7, wherein

And a plurality of partitions partitioning an inner space of the housing into a plurality of sections arranged in a line along the longitudinal direction of the housing.
The method of claim 9,

The housing includes a pair of sidewalls extending along the longitudinal direction of the housing,

The sidewalls have a plurality of grooves thereunder;

At least one groove is disposed in each of the sections.
The method of claim 10,

Wherein each of said sections is in fluid communication with the hollow of said diffuser through at least one diffuser hole.