KR20090129017A - A membrane module and its manufacturing method with anti-fouling and energy reduction - Google Patents

Abstract

PURPOSE: A hollow fiber membrane module with anti-fouling and energy reduction and a manufacturing method thereof are provided to minimize pressure loss of a pipe according to the length of a hollow fiber membrane, and to discharge the attached pollutants to the outside. CONSTITUTION: A manufacturing method of a hollow fiber membrane module includes the following steps of: inserting a bundle of a hollow fiber membrane(7) and a housing of a diffuser(6); placing the bundle of the hollow fiber membrane using a holder to maintain an interval of the hollow fiber membrane; hardening the hollow fiber membrane with a potting agent; cutting a hardened potting part; producing a left and right cap(15) and a center cap(16); and assembling the caps on the housing after arranging the caps and the housing to second-step structure.

Description

A membrane module and its manufacturing method with anti-fouling and energy reduction

The present invention is provided with a bundle of hollow fiber membrane for treating the inflow water flowing into the hollow fiber membrane module housing, scrubbing the surface of the hollow fiber membrane with air bubbles generated by injecting air in the center of the housing attached to the surface of the hollow fiber membrane A diffuser is installed to remove the pollutant, an air vent for discharging the bubbles generated by the diffuser is installed on the upper part of the housing, and the pollutant separated by the bubbles generated by the diffuser is concentrated using the natural gravity principle. Concentrated water outlets discharged to the outside with the water is installed in the lower part of the housing, and the inlet water inlet is installed at the left and right sides of the housing to be used for water treatment, thereby improving water treatment efficiency and effectively removing contaminants attached to the surface of the hollow fiber membrane. , Minimizing pressure loss inside used desert module and miniaturizing and reducing water treatment device It relates to a hollow fiber membrane module and a hollow fiber membrane module fabricated method to be made.

In general, it is well known that water treatment using hollow fiber membranes is a technique for purifying contaminated water using selective permeability of a material forming the hollow fiber membranes.

At this time, the water treatment apparatus for treating contaminated water using hollow fiber membranes is not only economical in terms of energy saving, facility simplification, and operation efficiency, but also meets social needs such as protecting the environment. Therefore, a wide range of research and practical use has been made, ranging from simple laboratory scale to scale used in various industrial fields.

Such hollow fiber membranes have a great influence on operation depending on the material of the membrane, but also have a dominant influence on the internal arrangement structure on the hollow fiber membrane module. On the other hand, another important factor in the water treatment process is how much economic efficiency can be obtained when the hollow fiber membrane module is used.

As a study on the arrangement structure of the hollow fiber membrane module, the research has been conducted by many scientists to minimize the contamination of the hollow fiber membrane by installing baffles between the hollow fiber membranes and to increase the treatment efficiency through the formation of vortices. have. European Patent EP 1,442,782A1 discloses a method for promoting vortices of influent and reducing membrane fouling by providing various types of baffles at the head of the inlet or outlet.

Koch's Super-Core ^(R) , which is commercially available, uses a criss-cross baffle to prevent contaminants between the hollow fiber membranes and the hollow fiber membranes and to smooth the flow of fluid, resulting in high processing efficiency and high operational efficiency. Ease is provided.

In the case of Membra's Liqui-Flux ^(R), the bundle of subunits is wrapped in a mesh and composed of one unit bundle, consisting of seven unit bundles per module to promote vortices of the fluid along the mesh of the mesh and to increase the density of the membrane. It is configured to reduce the contaminants attached to the membrane. However, these studies and commodities show that even if the pollutants have been removed from the membrane surface, it is difficult to take out the contaminated solids to the outside. This has a problem of acting as a factor that accelerates the fouling cycle of the membrane quickly.

On the other hand, in most cases, vertical membrane module arrays (eg, Asahi Kasei, Toray, Memcore) are adopted in terms of economic efficiency. However, the installation cost increases due to the increase of additional facilities in constructing the water treatment membrane separation system. There is a problem that it is very difficult to implement the minimization of the installation area, and the maintenance is not easy.

Inge's T-Rack, even in the case of vertical membrane modules, adopts a dense membrane module array structure, which can result in a reduction of installation facilities and a reduction in installation costs.However, maintenance problems due to the accumulation of pollutants during operation Is holding.

Although X-FLOW's XIGA ^{™, which} was recently merged by Noritz, which has improved the disadvantages of vertical membrane modules, has the advantage in price competitiveness, these modules have long tube lengths. Since the pressure loss is large, energy consumption is large, and contaminant solids are not easily removed after washing. As pointed out above, there is an urgent need to develop a pressurized hollow fiber membrane module capable of improving the reduction of membrane operation efficiency due to the difficulty of removing pollutants and the effect of saving the installation area and additional facilities according to the arrangement of membrane modules. As required.

The problem to be solved by the present invention is to insert the air cleaning tube in the inner center in order to take out the contaminated solids desorbed by the adhesion and cleaning of the hollow fiber membrane of the pollutant generated inside the existing hollow fiber membrane module, the diffuser By scrubbing the surface of the hollow fiber membranes with air bubbles by injecting air into the air bubbles, the contaminants attached to the surface of the hollow fiber membranes are desorbed and then easily discharged to the outside through the concentrated water outlet using natural gravity principle. It is.

Another problem to be solved by the present invention is designed and manufactured to achieve a horizontal arrangement of the water treatment device to minimize the auxiliary facilities and the installation area according to the horizontal type, and hollow fiber membrane length by configuring the hollow fiber membrane module in a two-stage series structure In order to minimize the pressure loss in the pipe to save energy, and to be able to express pollution resistance and economic efficiency at the same time.

The solution of the present invention is a bundle of hollow fiber membranes for treating the inflow water flowing into the housing of the hollow fiber membrane module is installed, the air bubbles generated by injecting air in the center of the housing scrubbing the hollow fiber membrane surface of the hollow fiber membrane An air diffuser is installed to remove the pollutant attached to the surface of the air source, and an air vent for discharging air bubbles generated from the air diffuser is installed at the upper part of the housing. Using the principle, the concentrated water outlets discharged to the outside together with the concentrated water are installed on the left and right sides of the center cap of the lower part of the housing, and the inlet water outlet is installed on the upper part of the housing center, thereby improving the water treatment efficiency by the hollow fiber membranes, and the surface of the hollow fiber membranes. Effectively removes contaminants attached to the pressure and pressure loss in the hollow fiber membrane module tube Minimizing the addition there is provided a manufacturing method of a hollow fiber membrane module and hollow fiber membrane module produced designed to achieve the size and weight of a water treatment device.

Another solution of the present invention is designed and manufactured to achieve a horizontal arrangement of the water treatment device, minimizing the auxiliary facilities and installation area according to the horizontal type, by placing a central cap to collect the treated water in the center of the two-stage series By designing and manufacturing the hollow fiber membrane module with its structure, the hollow fiber membrane is manufactured to minimize the pressure loss in the pipe according to the hollow fiber membrane length, improve treatment efficiency, save energy, improve pollution resistance and economic efficiency at the same time, and facilitate maintenance. The present invention provides a method for manufacturing a module and a hollow fiber membrane module.

The present invention inserts an air cleaning tube into the center in order to carry out the contaminated solids desorbed by the hollow fiber membrane adhesion and cleaning of the pollutant generated inside the existing hollow fiber membrane module, the injection of air into the diffuser By scrubbing the surface of the hollow fiber membrane with the air bubbles generated by the air bubbles, the pollutant attached to the surface of the hollow fiber membrane is desorbed and then discharged to the outside by using natural gravity and the flow of concentrated water. .

 Another effect of the present invention is to make the horizontal arrangement of the water treatment device is designed to minimize the installation and installation area according to the horizontal installation, and the hollow fiber membrane module in a two-stage series structure around the center cap By minimizing the pressure loss in the pipe according to the hollow fiber membrane length, it is possible to save energy and to simultaneously express pollution resistance and economic efficiency.

It looks at the specific content for the practice of the present invention. In the present invention, a bundle of hollow fiber membranes for treating inflow water is installed inside a housing of a hollow fiber membrane module, and scrubbing the surface of the hollow fiber membranes with air bubbles generated by injecting air into the center of the housing is attached to the surface of the hollow fiber membrane. A diffuser is installed to remove the air, and an air vent for discharging the bubbles generated by the diffuser is installed at the upper part of the housing, and the contaminated source separated by the bubbles generated from the diffuser is concentrated using natural gravity. With the concentrated water outlet discharged to the outside is installed in the lower portion of the housing, the inlet water inlet is installed on the left and right sides of the housing, and the treated water outlet is installed in the lower portion of the housing adjacent to the center cap to improve the water treatment efficiency by the hollow fiber membrane Effective removal of contaminants attached to the surface of hollow fiber membranes As well as minimizing the water treatment apparatus using a design making the hollow fiber membrane module, and this, to achieve the miniaturization and weight reduction of the water treatment system.

Hereinafter, the configuration and operation of the embodiments of the present invention with reference to the accompanying drawings, the configuration and operation of the present invention shown and described in the drawings will be described by at least one embodiment, whereby the present invention described above The technical idea and its core composition and operation are not limited.

It looks at the drawings to facilitate the understanding of the present invention. Figure 1 shows a schematic diagram of a pressurized hollow fiber membrane module designed according to the present invention, Figure 2 is a hollow fiber membrane housing used in the present invention. Figure 3 shows each design part according to the manufacturing design sequence of the present invention, Figure 4 shows a comparative example of a water treatment apparatus using a conventional hollow fiber membrane module. Figure 5 shows an embodiment of a water treatment apparatus using a hollow fiber membrane module designed in the present invention, Figure 6 shows a comparison of the operation evaluation of the existing hollow fiber membrane module and the present invention hollow fiber membrane module.

Looking at the method of manufacturing the hollow fiber membrane module for treating the inflow water using the hollow fiber membrane designed and manufactured according to the present invention, as shown in Figure 2 through the hollow fiber membrane to discharge the treated water is concentrated to discharge the concentrated concentrated water A bundle of hollow fiber membranes 7 for treating inflow water in the housing 4 composed of a water vent 8 and an air vent 5 installed on one side of the housing for discharging air from the diffuser and the center thereof Inserting the diffuser (6) in, through the step of leaving the hollow fiber membrane bundle using a holder for maintaining the hollow fiber membrane at a predetermined interval, through a curing step of curing it with a potting agent, and then the curing Through the cutting step of cutting the cut portion, the central cap 16 for collecting the treated water is fastened to the housing, the air inlet and inlet water inlet is installed Through the steps of manufacturing the left and right cap 15, a central cap 16 for collecting the treated water passing through the hollow fiber membrane is installed at the center of the housing, and air is supplied to the diffuser installed in the center of the housing. Air inlet for injection is installed in the center of the left and right cap 15, the inlet inlet for injection of the inlet is arranged in a two-stage structure of the housing installed in the upper side of the left and right cap 15, and then the caps are assembled and assembled It is a method of manufacturing a hollow fiber membrane module made through a step.

In the present invention, as shown in Figure 2, by designing the inclined surface 25 in the lower portion of the housing 4 by giving the inner diameter deviation on the left side 23 and the right side 24 to discharge the pollutants by gravity, Contaminants desorbed by air cleaning are easily discharged to the concentrated water outlet 8 by gravity and the flow of concentrated water discharged is one of the main configurations of the present invention. The angle of the inclined surface 25 formed in the lower portion of the housing 4 is preferably formed to 2 ° to 30 °, if less than 2 ° desorption pollution source can not exhibit the sliding effect of gravity, if more than 30 ° There is a problem in that the integration of the hollow fiber membrane module is lowered due to the inhibition of membrane density.

In addition, the center of the housing is fixed to the center of the hollow fiber membrane and the diffuser (6) having a uniformly formed air discharge hole 10 for evenly discharging the air bubbles in the center of the air pipe 6 It is designed and manufactured to disperse maximum air pressure during cleaning so that it can be evenly cleaned with drops.

The diameter of the diffuser 6 having the air discharge holes 10 evenly formed is preferably 5 mm to 30 mm. If the diameter is less than 5 mm, the effect of air cleaning is reduced. Increased energy consumption due to desert density and tube loss of air pressure.

The diameter of the air discharge hole 10 formed in the diffuser 6 is preferably 0.1 mm to 5 mm. In general, when the diameter of the air discharge hole 10 formed in the diffuser 6 is 0.1 mm or less, bubbles in the form of fine droplets are formed to reduce the desorption effect of the pollutant by bubbling. This is likewise reduced in the desorption effect of the pollutant.

On the other hand, when the diameter of the air discharge hole 10 formed in the diffuser 6 is formed between 0.1 mm and 5 mm, circular bubbles are generated to maximize the desorption effect of the pollutant source, thereby effectively preventing contamination. .

Another main constitution according to the present invention is that the air scrubbing effect is achieved by stagnation of air pressure inside the air, which acts as a deterrent to smooth operation, thereby preventing the hollow fiber membrane contamination efficiently, thereby improving the efficiency of water treatment. Air vents 5 for discharging air bubbles to the outside of the housing are fixedly installed at the upper left and right centers of the housing of the hollow fiber membrane module.

Next, it is designed and manufactured to improve the efficiency of water treatment by preventing the hollow fiber membrane from becoming sombling by using the inflow holder and the outflow holder to maintain the interval of the hollow fiber membrane. The inlet 11 and outlet 12 holders are preferably designed by dividing them into three to six sectors. If the length is less than three sectors, membrane contamination is increased due to the increase in membrane density. There is a problem that the density of the film is lowered due to the self-interval of the sector support.

The inflow holder 11 is formed with 1 to 4 inlet holes for each support (27) so that the inflow of the inflow can be smoothly introduced into the housing, the inflow is moved between the support and the support and into the hollow fiber membrane It is preferable to configure so that it may flow in easily. If four or more holes are formed per support column, the durability of the support column 27 is lowered due to a decrease in the mechanical strength of the support column 27. The outflow holder 12 is made of the same number of sections corresponding to the number of sections of the inflow holder 11.

The hollow fiber membrane 7 is fixedly installed at a predetermined interval using a round cylindrical housing, a diffuser, and left and right holders designed and manufactured according to the above-described configuration of the present invention, but the inflow into the pipe flows at a constant flow rate without resistance into the pipe. Insert the inlet forming pipe between the hollow fiber membranes. Since the potting agent is used to carry out the potting operation using a potting agent, a urethane-based adhesive or an epoxy-based adhesive is used, and is allowed to stand for a certain time until the adhesive is completely cured.

The housing 4, which has completed the curing of the adhesive, cuts the cured adhesive portion by using a cutting device. The inlet holder 11 is configured such that the hollow fiber membrane is closed and only the inlet pipes 13 are exposed. It is configured to flow in smoothly, and the inside diameter of the hollow fiber membrane is open on the side with the outlet holder 12 is configured to be able to smoothly collect the treated water passing through the membrane, such a configuration is easy through FIG. I can understand it.

The diffuser is configured to open the inlet holder 12 in a manner similar to the hollow fiber membrane so that air injection can be made smoothly, and the outlet holder 12 is closed to reduce the pressure loss of the injected air. It is configured to utilize as efficiently as possible.

As described above, the finished housing 4 is assembled by using the inlet cap 15 of each of the left and right sides and the central cap 16 which is manufactured to collect the treated water passing through the hollow fiber membrane to manufacture the hollow fiber membrane module. . At this time, the inlet cap 15 of both sides is designed and manufactured to be made at the same time by the inlet of the inlet and the inlet of the inlet water separately installed, the air inlet is attached to the oil ring to prevent unnecessary air outflow It is configured to be.

The inside of the left and right both sides of the inlet cap 15 is formed to form a jaw that can be fixed to install the oil ring and is configured to reduce the energy consumption due to pressure loss by inserting the oil ring to minimize the leakage of the operating pressure. The central cap 16 is configured to form a screw thread on both sides, and to form a jaw to which an oil ring can be attached to prevent the loss of treated water due to leakage when assembled with the external thread of the housing.

The round caps having the configuration according to the respective functions are designed and manufactured with two series structures in a symmetrical or different length with respect to the medium pressure cap 16, and the inlet 2 and the outlet 9 are It is fixedly installed at the upper part of the housing, and the concentrated water outlet 8 is configured to be fixedly installed at the lower part of the housing so as to be discharged together with the contaminants dropped at the lower part of the housing.

The hollow fiber membrane module having a two-stage series arrangement structure designed and manufactured according to the present invention can minimize the pressure loss that may occur in the pipe compared to the integrated hollow fiber membrane module housing having the same length, so that energy can be efficiently used and water treatment efficiency It acts to increase.

Hereinafter, the contents of the present invention will be described in detail through <Comparative Example> and <Example>. However, these <embodiments> are only one embodiment presented in order to make it easy to understand the content of this invention, and the scope of the present invention is not limited to these <embodiments>.

EXAMPLES

In order to explain one specific embodiment of the hollow fiber membrane module designed and manufactured according to the present invention, a hollow fiber membrane conventionally used as a <comparative example> was selected, and as a <embodiment>, a hollow fiber membrane module manufactured according to the present invention was used. The experiment was performed. Table 1 shows the conventionally used. Specifications of the hollow fiber membrane module and the hollow fiber membrane module produced by the present invention are shown.

Experimental conditions and operating conditions according to the embodiment are shown in Table 2, and 30 days of operation was performed in the apparatus shown in FIGS. 4 and 5 to observe the state of operation. The performance index of the hollow fiber membrane module was determined by collecting permeate at a constant flow rate of 2.0 ㎥ / ㎡ / day and measuring the transmembrane pressure (TMP). If the degree of contamination of the hollow fiber membrane is increased, the interlayer differential pressure will be increased. If there is no change in the differential pressure between the hollow fiber membranes, the degree of contamination will not increase. Therefore, the excellence of the hollow fiber membrane module and the stability of the device will be secured.

On the other hand, the hollow fiber membrane differential pressure shows a slight difference in calculation because the installation method of the two hollow fiber membrane modules are vertical type (conventional) and horizontal type (invention).

Conventional case: TMP = [(P ₁ + P ₂ -H) / 2]-P ₃

For the present invention: TMP = [(P ₁ + P ₂ ) / 2]-P ₃

Where TMP is the transmembrane pressure, P1 is the inflow water pressure, P2 is the concentrated water pressure, P3 is the permeate water pressure and H is the water column water pressure.

<Table 1> Specification of experimental hollow fiber membrane module

<Table 2> Experimental and Operational Conditions

As a result of this, as shown in FIG. 6, the hollow fiber membrane developed in the present invention is gradually increased in the case of the conventional hollow fiber membrane module, while the differential pressure between the hollow fiber membranes is gradually increased under the experimental conditions and operating conditions, which are relatively harsh conditions. The module shows that it is operating stably.

The present invention provides a bundle of hollow fiber membranes for treating inflow water inside the hollow fiber membrane module housing, and scrubbing the air bubbles generated by injecting air into the center of the housing to the surface of the hollow fiber membranes A diffuser is installed to remove the air, and an air vent for discharging the bubbles generated by the diffuser is installed at the upper part of the housing. The concentrated water outlet discharged to the outside is installed at the lower part of the housing, the inlet water inlet is installed at the left and right sides of the housing, and the treated water outlet 9 is installed at the center to improve the water treatment efficiency by the hollow fiber membrane, and the surface of the hollow fiber membrane. It effectively removes contaminants attached to the membrane and minimizes the pressure loss inside the hollow fiber membrane module tube. To provide a design and production of the hollow fiber membrane module and hollow fiber membrane module manufacturing method to achieve the size and weight of the water treatment device ulreo it is highly INDUSTRIAL.

1 is a pressurized membrane module designed according to the present invention

2 is a membrane housing used in the present invention

Figure 3 is each design component according to the manufacturing design sequence of the present invention

4 is a system applying an existing membrane module (comparative example)

Figure 5 is an application system of the membrane module designed in the present invention (embodiment)

6 is a comparison result of the operation evaluation of the existing membrane module and the present invention membrane module

<Name of Symbol in Drawing>

One; Air inlet 2; Influent Inlet

3; Potting agent 4; housing

5; Air vent 6; Diffuser

7; Hollow fiber membrane 8; Concentrated water outlet

9; Treated water outlet 10; Air vent hole

11; Inlet holder (inlet side) 12; Outflow holder (outflow side)

13; Inlet pipe 14; Oil ring

15; Inlet cap 16; Center cap

17; Raw water tank 18; Strainer

19; Feed water tank 20; Compressor

21; Membrane module 22; Permeate Tank

23; Housing left side view 24; Housing Right Side View

25; Housing lower slope 26; Chemical cleaning tank

27; Prop

Claims (9)

In the method of manufacturing a hollow fiber membrane module for treating influent using a hollow fiber membrane, A bundle of the hollow fiber membranes 7 for treating inflow water and a diffuser pipe 6 are inserted into the center of the housing in the housing 4 provided with the concentrated water outlet 8 and the air vent 5, and the hollow fiber membranes are fixed. Standing the hollow fiber membrane bundles using a holder for maintaining the spacing; Curing step of curing by bonding the left and right sides of the hollow fiber membrane using a potting agent; Cutting the cured potting part; Manufacturing a left and right cap 15 having a central cap 16 for collecting the treated water coupled to the housing, an air inlet port, and an inlet water inlet port; And The center cap 16 for collecting the produced water, the left and right caps 15 and the housing in which the air inlet and the inlet water inlet are installed are arranged in a two-stage structure and then assembled by assembling the caps. Method of manufacturing hollow fiber membrane module. In the hollow fiber membrane module for use in water treatment, An inflow water inlet for being installed at the left and right sides of the housing 4 of the hollow fiber membrane module to inject the inflow water into the hollow fiber membrane; An air inlet (1) installed at the center of the left and right sides of the housing for injecting air into the diffuser; An air diffuser installed in the center of the housing and having an air discharge hole 10 for generating air bubbles so as to eject air injected through the air inlet 1 to prevent contaminants from adhering to the hollow fiber membranes; Hollow fiber membranes installed on the left and right sides of the central cap 16 so as to concentrate the inflow water injected into the inflow water inlets installed on the left and right sides of the diffuser; A central cap for collecting the treated water discharged through the hollow fiber membrane and a treated water outlet 9 for discharging the treated water collected in the central cap; And Hollow fiber membrane module for water treatment is installed in the lower portion of the housing having a concentrated water outlet for discharging contaminants and concentrated concentrated water. The method according to claim 2, The inclined surface 25 is formed to give an inner diameter deviation to the left side 23 and the right side 24 of the hollow fiber membrane module so that the lower portion of the housing 4 is inclined, and the inclination angle is formed at 2 ° to 30 °, A hollow fiber membrane module for water treatment, characterized in that the pollutant desorbed by air cleaning is easily discharged to the concentrated water outlet (8) by gravity and the cloudy water is discharged. The method according to claim 2 or 3, The diameter of the diffuser installed in the center of the housing of the hollow fiber membrane module to generate air bubbles is 5 mm to 30 mm so as to reduce contamination of the hollow fiber membrane, and the air pressure when cleaning the hollow fiber membrane Hollow fiber membrane module for water treatment, characterized in that configured to reduce the loss of air pressure by dispersing. The method according to claim 4, The diameter of the air discharge hole formed in the diffuser is hollow fiber membrane module for water treatment, characterized in that the bubble is formed in a 0.1mm to 5mm to maintain the circular shape to increase the removal efficiency of contaminants. The method according to claim 2 or 3, It is installed on the upper left and right sides of the housing of the hollow fiber membrane module to prevent the stagnation of air pressure inside the air to efficiently remove the pollutant of the hollow fiber membrane air vent for discharging the air bubbles discharged to the diffuser to the outside of the housing Hollow fiber membrane module for further water treatment. The method according to claim 2 or 3, While increasing the density of the hollow fiber membranes, the hollow fiber membranes are prevented from soaking to one side, so that the hollow fiber membranes can be divided into three or six sectors so as to reduce the hollow fiber membrane contamination. ) Hollow fiber membrane module for water treatment, characterized in that consisting of a holder. The method according to claim 7, The hollow fiber membrane module for water treatment, characterized in that 1 to 4 holes are formed for each support column so that the inflow water introduced into the inflow water inlet flows smoothly through the hole formed in the support column. The method according to claim 2 or 3, It is installed horizontally by forming two series structures symmetrically with respect to the center cap in which the treated water passing through the left and right hollow fiber membranes are collected, and the influent inlet 2 and the treated water outlet 9 are located at the top of the housing. , Concentrated water outlet 8 is hollow fiber membrane module for water treatment, characterized in that installed in the lower portion.

Images