WO2012134127A2 - Filtration membrane module and filtration system including same - Google Patents

Abstract

Disclosed are a filtration membrane module and a filtration system including the same, wherein the filtration membrane module which minimizes the blockage of an air diffuser caused by impurities such as sludge, etc. and costs required for installation and operation, and simplifies a production process. The filtration membrane module of the invention comprises: a first header; a second header which is located at the lower part of the first header during water treatment of the filtration membrane module; and a filtration membrane between the first and second headers, wherein a plurality of through-holes are formed in the second header.

Description

Filtration membrane module and filtration system comprising the same

The present invention relates to a filtration membrane module and a filtration system including the same, and more particularly, to minimize blockage of an air diffuser due to impurities such as sludge, simplify the manufacturing process, and install and operate costs. The present invention relates to a filtration membrane module and a filtration system including the same.

The separation method using a filtration membrane has many advantages over the separation method using heating at a high temperature or a phase change. One of the biggest advantages is that the desired water quality can be stably obtained according to the pore size of the filtration membrane, thereby increasing the reliability of the process. Can be. In addition, since the use of a filtration membrane does not require an operation such as heating at a high temperature, when the filtration membrane is used in a separation process using microorganisms, the microorganisms can be prevented from being affected by heat.

As one of the filtration membrane modules, the filtration membrane module is directly immersed in the fluid to be treated in the water tank and negative pressure is applied to the inside of the filtration membrane to selectively permeate only the fluid into the filtration membrane to separate solid components such as impurities or sludge. There is a suction filtration membrane module. Adopting the suction filtration membrane module does not require the equipment for the circulation of the fluid has the advantage that can bring down the facility cost or operating cost.

On the other hand, 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.

Among the various methods of filtration membrane cleaning is the aeration method. 1 schematically shows a filtration system in which cleaning by an acid method is performed.

As shown in FIG. 1, the filtration system includes a plurality of filtration membrane modules 110. The filtration membrane modules 110 are immersed in a fluid to be treated in a water tank (not shown). A negative pressure is applied to the inside of the filtration membrane so that only the fluid selectively penetrates the filtration membrane, thereby separating solid components such as sludge mixed in the fluid, that is, impurities. Permeate obtained through the filtration membrane modules 110 is sent to the filtrate reservoir (not shown) through the common pipe 130.

An air diffuser 120 is disposed below the membrane modules 110 to generate coarse bubbles to prevent contamination of the surface of the membrane during water treatment, that is, fouling.

The diffuser 120 includes a main pipe composed of unit pipes 121, cross connectors 122 connecting the air diffusion pipes 121 to each other, and a plurality of mountains. Organs 124 and reducers 123 connecting the cross connectors 122 and diffusers 124 of different diameters.

Each diffuser 124 has a plurality of aeration holes H formed along its longitudinal direction. The diffusers 124 are arranged such that their longitudinal direction is parallel to the plane of the filtration membrane modules 110. Air provided from the air supply unit (not shown) is discharged through the air holes H of the diffusers 124 through the main pipe to generate coarse bubbles, and the coarse bubbles vibrate the filtration membrane modules 110. This prevents contamination of the filtration membrane.

The air diffuser 120 has a problem in that impurities are introduced and accumulated through the air diffuser holes H of the diffusers 124 as the water treatment proceeds, thereby clogging not only the diffusers 124 but also the main pipe. There are a plurality of diffusers 124 branched from the main pipe separately from the main pipe, and a plurality of diffuser holes H are formed to provide an inflow passage for impurities in each of the diffusers 124. In the same structure, the blockage of the diffuser is more serious.

In addition, the diffuser device 120 of the above structure is a separate manufacturing process of the plurality of unit pipes 121, cross connectors 122, reducers 123, and diffusers 124 and their assembly process Since it requires, the manufacturing and installation of the diffuser 120 is complicated, resulting in increased cost.

Accordingly, the present invention relates to a filtration membrane module and a filtration system including the same, which can prevent problems caused by the above limitations and disadvantages of the related art.

One aspect of the present invention is to provide a filtration membrane module and a filtration system including the same, which can dramatically reduce the blockage phenomenon of the acid generator by minimizing the opportunity of introducing impurities such as sludge into the acid generator. .

Another aspect of the present invention is to provide a filtration membrane module and a filtration system including the same, which can simplify the manufacturing process and minimize installation and operation costs.

Another aspect of the present invention provides a filtration membrane module and a filtration system including the same, which do not require the installation of a coarse bubble generating apparatus for preventing fouling of the filtration membrane in activated sludge treatment using the filtration membrane. To provide.

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

According to an aspect of the present invention as described above, the first header; A second header located below the first header during the water treatment operation of the filtration membrane module; And a filtration membrane between the first and second headers, and a plurality of through-holes are formed in the second header.

According to another aspect of the invention, a plurality of filtration membrane modules to be immersed in the fluid to be treated; And an air diffuser positioned below the filtration membrane modules and providing air bubbles in the fluid during a water treatment operation of the filtration membrane modules, wherein each of the filtration membrane modules comprises: a first header; A second header positioned below the first header during the water treatment operation of the filtration membrane module; And a filtration membrane between the first and second headers, and a plurality of through holes are formed in the second header, so that bubbles provided from the diffuser are raised toward the filtration membrane through the through holes of the second header. Provided is a filtration system, characterized in that.

According to another aspect of the invention, the filter membrane module; And a microbubble generator positioned below the filtration membrane module during a water treatment operation of the filtration membrane module, wherein the filtration membrane module comprises: a first header; A second header positioned below the first header during the water treatment operation of the filtration membrane module; And a filtration membrane between the first and second headers, wherein the second header extends from a body and an outer periphery of the body such that the second header has a first groove for collecting the microbubbles. And a plurality of through holes formed in the side protrusion of the second header, and the micro bubbles generated by the micro bubble generator are collected in the first groove of the second header for a predetermined period of time. When they are ejected toward the filtration membrane through the through holes, a filtration system is provided, characterized in that it becomes a coarse bubble.

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, the blockage phenomenon of the diffuser can be drastically reduced by minimizing the opportunity for impurities such as sludge to be introduced into the diffuser. As a result, the repair and replacement cycle of the diffuser pipe can be reduced. By increasing the maintenance cost of the filtration system can be reduced.

Moreover, according to the filtration membrane module and the filtration system of this invention, manufacture and installation of an air diffuser can be simplified.

In addition, according to the filtration membrane module of the present invention can be used to prevent the fouling of the filtration membrane by converting the micro-bubbles to be provided to the anaerobic microorganisms into coarse bubbles, there is no need to install a separate air diffuser for generating coarse bubbles.

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 schematically shows a filtration system in which cleaning by an acid method is performed;

2 illustrates one embodiment of a filtration system comprising a filtration membrane module of the present invention,

3 is a cross-sectional view of the filtration membrane module according to an embodiment of the present invention along the line AA ′ of FIG. 2,

4 is a cross-sectional view of a filtration membrane module according to another embodiment of the present invention along the line AA ′ of FIG. 2;

5 illustrates another embodiment of a filtration system including the filtration membrane module of the present invention.

It will be apparent to those skilled in the art that various changes and modifications of the present invention are possible without departing from the spirit and scope of the present invention. Accordingly, the invention includes all modifications and variations that fall within the scope of the invention as set forth in the claims and their equivalents.

The term "coarse bubble" as used herein is defined as a bubble having a diameter of more than 100 μm. Since the coarse bubbles rise in the water at a relatively high speed, the filtration membrane can be cleaned by air scrubbing.

The term "fine bubble" as used herein is defined as a bubble having a diameter of 100 μm or less. Strictly speaking, microbubbles can be further classified into micro bubbles having a diameter of 1 to 100 μm and nano bubbles having a diameter of less than 1 μm. Microbubbles rise relatively slowly in water and slowly disappear. Nanobubbles can last for months in water. In the present specification, "micro-strength bubbles" may be understood to mean mainly micro bubbles, but not completely exclude nano bubbles.

Hereinafter, with reference to the accompanying drawings will be described in detail an embodiment of a filtration membrane module and a filtration system including the same according to the present invention.

Embodiments of the present invention described below illustrate a hollow fiber membrane as a filtration membrane in order to explain the technical idea of the present invention, but the present invention is not limited to the hollow fiber membrane, but various kinds of filtration membranes including flat membranes It can be applied to both filtration membrane modules and filtration systems.

2 is an example of a filtration system including the filtration membrane module of the present invention.

As shown in FIG. 2, the filtration system of the present invention includes a plurality of filtration membrane modules 200. The filtration membrane modules 200 are immersed in a fluid to be treated in a water tank (not shown). Permeate obtained through the filtration membrane modules 200 is sent to a filtrate reservoir (not shown) through a common pipe (not shown).

An air diffuser 300 for generating coarse bubbles is disposed under the filter membrane modules 200 to prevent contamination of the surface of the hollow fiber membrane 230 during the water treatment, that is, fouling. The diffuser 300 is made of metal or polymer.

The filtration membrane module 200 according to an embodiment of the present invention includes a first header 210, a second header 220 positioned below the first header 210 during a water treatment operation of the filtration membrane module 200, And a hollow fiber membrane 230 between the first and second headers 210 and 220. Both ends of the hollow fiber membrane 230 are potted to the fixing part 240 to fix the hollow fiber membrane 230 to the first and second headers 210 and 220, respectively.

Polymers that can be used in the production of the hollow fiber membrane 230 of the present invention are polysulfone resin, polyethersulfone resin, sulfonated polysulfone resin, polyvinylidene fluoride (PVDF) resin, polyacrylonitrile (PAN) resin, At least one of polyimide resin, polyamideimide resin and polyesterimide resin.

The hollow fiber membrane 230 of the present invention 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 the surface thereof. The tubular braid may be made of polyester or nylon.

The first header 210 has a collecting space therein, and the hollow of the hollow fiber membrane 230 is in fluid communication with the collecting space of the first header 210. When a negative pressure is applied to the inside of the hollow fiber membrane 230 through the collecting space of the first header 210, only the fluid selectively penetrates the hollow fiber membrane 230 to separate solid components such as sludge mixed in the fluid. The filtered water flowing through the hollow fiber membrane 230 and introduced into the hollow flows into the water collecting space in the first header 210.

A plurality of through holes h1 having a diameter of 5 to 7 mm is formed in the second header 220 along the length of the second header 220.

The air diffuser 300 of the present invention includes a pipe. The pipe is arranged such that its longitudinal direction is perpendicular to the longitudinal direction of the second header. A plurality of diffuser holes h2 are formed in the pipe along the longitudinal direction thereof. Air provided from the air supply unit (not shown) is discharged through the diffuser holes h2 of the diffuser 300 to generate coarse bubbles.

Coarse bubbles supplied from the air diffusers h2 of the air diffuser 300 are evenly distributed in the longitudinal direction of the second header 220 through the through holes h1 of the second header 220 to rise. Vibration is prevented by vibrating the filtration membrane modules 200.

According to the present invention, since the coarse bubbles for cleaning the hollow fiber membrane 230 are evenly distributed to the entire hollow fiber membrane 230 through the through holes h1 of the second header 220, the second header 220. Multiple diffusers branched from the main piping are not required for even distribution of coarse bubbles along the longitudinal direction of. Since no separate diffusers are required, opportunities for introducing solid components, such as sludge, into the diffuser 300 can be minimized. As a result, according to the present invention, clogging of the air diffuser 300 can be significantly reduced.

In addition, according to the present invention, since the diffuser device 300 can be manufactured by only an integrated pipe, separate manufacturing of the main pipe, diffusers and various components for connecting them, and their assembly process can be omitted. The manufacturing process of the air diffuser 300 can be greatly simplified.

Hereinafter, the second header 220 of the present invention will be described in more detail with reference to FIGS. 3 and 4. 3 and 4 illustrate a second header 220 according to different embodiments of the present invention, respectively.

As shown in FIGS. 3 and 4, the second header 220 of the present invention includes a body 221 to which the hollow fiber membrane 230 is fixed through the fixing part 240 and an outer periphery of the body 221. It includes an extended side formed protrusion 222. The through holes h1 of the second header 220 are formed along the longitudinal direction of the second header 220 in the side protrusion 222.

Since the side protrusion 222 extends downwardly of the filtration membrane module 230, the second header 220 opens the first groove S1 surrounded by the body 221 and the side protrusion 222 below. Have Coarse bubbles supplied from the diffuser 300 are collected in a manner distributed along the longitudinal direction of the second header 220 in the first groove S1 of the second header 220 and then through holes h1. Since the coarse bubbles are escaped through, the coarse bubbles may be evenly ejected along the longitudinal direction of the second header 220.

The body 221 of the second header 220 is formed with a second groove S2 positioned opposite to the first groove S1. At least a part of the second groove S2 is filled with the fixing part 240, and the hollow fiber membrane 230 is potted on the fixing part 240.

According to one embodiment of the present invention illustrated in FIG. 3, since the filtered water passing through the hollow fiber membrane 230 flows only toward the first header 210 side, the second header 220 has a separate collecting space therein. Does not have When the hollow fiber membrane 230 is potted to the fixing part 240, the fixing part 240 to prevent the fixing part 240 material (eg, polyurethane resin) from being introduced into the hollow of the hollow fiber membrane 230. The end of the hollow fiber membrane 230 to be ported to is sealed.

In contrast, according to another exemplary embodiment of the present invention illustrated in FIG. 4, since the filtered water passing through the hollow fiber membrane 230 is designed to flow to both sides of the first and second headers 210 and 220, the first header ( The second header 220 as well as 210 also has a catchment space therein. That is, only a part of the second groove S2 of the second header 220 is filled by the fixing part 240, and as a result, the filtered water is between the body 221 and the fixing part 240 of the second header 220. A catchment space is formed for. The hollow of the hollow fiber membrane 230 ported to the fixing part 240 is in fluid communication with the collecting space of the second header 220.

5 shows another embodiment of a filtration system comprising the filtration membrane module of the present invention.

The filtration system of the present invention illustrated in FIG. 5 includes an aerobic tank 400. Aerobic bacteria are distributed in the fluid to be treated in the aerobic tank 400. Aerobic bacteria decompose organic matter contained in the fluid to be treated, such as industrial drainage and domestic drainage.

Since the larger the amount of dissolved oxygen in the fluid to be treated, the more favorable the decomposition of organic matter by aerobic bacteria, microbubbles having a diameter of 100 μm or less should be supplied into the aeration tank 400. Thus, the microbubble generator 500 is provided near the bottom of the aerobic tank 400 to continuously supply oxygen to the aerobic bacteria. The microbubble generator 500 generates microbubbles by receiving gas from the blower 600 and may be classified into a disc type of a ceramic material and a membrane type of a synthetic resin material.

The solid component may be separated after the filtration membrane module 200 is immersed in the fluid in the aerobic tank 400.

In this case, since the microbubble alone is not sufficient to prevent contamination of the filter membrane, if a conventional filter membrane module is used, the apparatus for generating coarse bubbles for coarse bubble generation to suppress fouling of the filter membrane by vibrating the filter membrane module in addition to the microbubble generator 500. Is required to be installed further.

Optionally, the filtration system may further comprise an aeration tank in addition to the aeration tank. When raw water to be treated from the aeration tank 400 flows into the degassing tank, the solid component may be separated from the degassing tank by using the filtration membrane module. However, also in this case, it is the same that the diffuser for generating coarse bubbles capable of vibrating the filtration membrane module should be provided in the degassing tank.

In addition to the installation and operation of the coarse bubble generating diffuser in addition to the micro-bubble generator 500 as described above not only increases the installation cost of the filtration system, but also increases the energy consumption and operating cost according to the operation of the coarse bubble generating diffuser There is a problem that must be accompanied.

On the contrary, according to the present invention, the filtration membrane module 200 of the present invention is immersed in the fluid of the aeration tank 400 without the coarse air bubble generation device to perform the fluid treatment. The microbubbles provided by the microbubble generator 500 are present in the first groove S1 of the second header 220 of the filtration membrane module 200 in a predetermined period. In this case, bubbles having a larger diameter are continuously generated due to the collision between the micro bubbles, and coarse bubbles are blown toward the hollow fiber membrane 230 through the through holes h1 having a diameter of 5 to 7 mm of the second header 220. . The coarse bubbles ejected through the through holes h1 of the second header 220 scrub the hollow fiber membrane 230 to remove contaminants attached to the surface of the hollow fiber membrane 230 and at the same time, the first header 210. The fouling is prevented by vibrating the filtration membrane module 200.

Therefore, as shown in FIG. 5, when the filtration membrane module 200 of the present invention is applied to the aerobic tank 400, contamination of the filtration membrane module 200 can be effectively prevented without the coarse air bubble generation apparatus, and as a result, the filtration membrane module 200 is filtered. The cost of installing and running the system can be minimized.

Claims (11)

In the filtration membrane module, A first header; A second header positioned below the first header during the water treatment operation of the filtration membrane module; And A filtration membrane between the first and second headers, A filtration membrane module, characterized in that a plurality of through holes are formed in the second header. The method of claim 1, The second header includes a body and side protrusions extending from an outer periphery of the body such that the second header has a first groove for bubble collection, The through-holes of the second header, the filtration membrane module, characterized in that formed in the side protrusion. The method of claim 2, The membrane module of claim 2, wherein a second groove is formed on a body opposite to the first groove. The method of claim 3, wherein Further comprising a fixing portion for filling at least a portion of the second groove, The filtration membrane module, characterized in that the filtration membrane is ported to the fixed portion. The method of claim 3, wherein Further comprising a fixing part for filling only a portion of the second groove, The filtration membrane is potted to the fixed portion, A filtration membrane module, characterized in that a collecting space for filtration water passing through the filtration membrane is formed between the body of the second header and the fixing portion. The method of claim 5, The filtration membrane is a hollow fiber membrane, Filtration membrane module, characterized in that the hollow of the hollow fiber membrane is in communication with the collecting space. A plurality of filtration membrane modules to be immersed in the fluid to be treated; And Located in the bottom of the filtration membrane module, including an air diffuser for providing air bubbles in the fluid during the water treatment operation of the filtration membrane modules, Each of the filtration membrane modules, A first header; A second header positioned below the first header during the water treatment operation of the filtration membrane module; And A filtration membrane between the first and second headers, A plurality of through holes are formed in the second header, so that bubbles provided from the air diffuser rise to the filtration membrane through the through holes of the second header. The method of claim 7, wherein The second header includes a body and a lateral protrusion extending from an outer periphery of the body such that the second header has a first groove for collecting the bubbles. The through holes of the second header are formed in the side projections. The method of claim 8, The diffuser includes a pipe, The pipe is arranged such that its longitudinal direction is perpendicular to the longitudinal direction of the second header, The pipe is formed with a plurality of diffuser holes formed along the longitudinal direction, And a coarse bubble is ejected through the air holes. Filtration membrane module; And Including a micro-bubble generator that is located below the filtration membrane module during the water treatment operation of the filtration membrane module, The filtration membrane module, A first header; A second header positioned below the first header during the water treatment operation of the filtration membrane module; And A filtration membrane between the first and second headers, The second header includes a body and side protrusions extending from an outer periphery of the body such that the second header has a first groove for collecting the microbubbles. A plurality of through holes are formed in the side protrusion of the second header, The micro-bubbles generated by the micro-bubble generator is trapped in the first groove of the second header for a predetermined period of time so that when the micro-bubbles are ejected toward the filtration membrane through the through-holes becomes a coarse bubble. The method of claim 10, The diameter of the through-holes of the second header is 5 to 7mm.

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