KR101726517B1

KR101726517B1 - Membrane module having a good fouling resistance

Info

Publication number: KR101726517B1
Application number: KR1020150135939A
Authority: KR
Inventors: 최경규; 장홍진
Original assignee: 롯데케미칼 주식회사
Priority date: 2015-09-24
Filing date: 2015-09-24
Publication date: 2017-04-13
Also published as: KR20170036978A

Abstract

The present invention provides a hollow fiber membrane module including a hollow fiber membrane bundle including a plurality of hollow fiber membranes, a first potting layer for fixing the upper end of the bundle of hollow fiber membranes, a second potting layer for fixing the lower end of the bundle of hollow fiber membranes, A first potting cap formed to surround the second potting layer and a second potting cap surrounding the outer surface of the second potting layer; A housing having the hollow fiber bundle received therein and having an outlet port for discharging the concentrated water; An upper cap disposed at an upper end of the housing and including an outlet through which filtered water is discharged; And a lower cap disposed at a lower end of the housing, the lower cap including an inlet through which at least one of air and process water flows, wherein at least one of the first and second potting layers, Which is movable upward and downward within the chamber.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a separation membrane module,

The present invention relates to a separation membrane module for water treatment, and more particularly, to a separation membrane module in which a separation membrane bundle flows in a vertical direction according to a flow of a fluid to remove contaminants on the separation membrane surface, thereby improving staining resistance.

In the conventional membrane water treatment process, air bubbles are injected at the time of backwashing to wash the membrane, and the membrane is shaken to remove contaminants attached to the membrane surface. However, in the case of the conventional water treatment separation membrane, since the separation membrane bundle is fixed to the head part by the potting layer, the degree of flow by the air bubbles is limited, and thus it is easy to remove contaminants on the membrane surface I did. Accordingly, in order to solve the above problems, there has been proposed a method of improving the cleaning efficiency by regulating the flow of air bubbles or water during backwashing, or removing contaminants on the surface of the separation membrane by using ancillary equipment.

Korean Patent Publication No. 2011-0083417 discloses a method of forming a channel through which air passes through an end cap for fixing a hollow fiber membrane. The area of the channel is made smaller toward the upper side so that the passage through which air bubbles pass during backwashing is narrowed to increase the pressure of the air bubbles. However, in the case of the above method, the cleaning force is improved to a certain extent at the lower end of the separation membrane, but the cleaning effect is not improved at the upper end of the separation membrane.

Korean Patent Laid-Open Publication No. 2014-0048748 discloses a technique for improving the membrane fouling resistance of a separation membrane by adding a nanocarbon structure to the separation membrane and irradiating ultraviolet rays thereto. However, in the case of the above method, it is not applicable to a commercialized separation membrane, and a separation membrane containing a nano carbon structure must be prepared separately. Further, an apparatus and energy for UV irradiation are additionally required, .

Therefore, there is a demand for development of a water treatment separation membrane that can be applied to commercialized separation membranes, is economical, can improve cleaning efficiency over the entire separation membrane, and has excellent stain resistance.

It is an object of the present invention to provide a separation membrane module in which a first porting layer and / or a second porting layer can be vertically moved in accordance with a flow of a fluid to facilitate removal of contaminants.

It is another object of the present invention to provide a separation membrane module which can separate the hollow fiber membrane bundle from the housing and can check the internal state of the hollow fiber membrane bundle and separately clean the hollow fiber membrane bundle if necessary.

It is a further object of the present invention to provide a spiral groove in an inner wall of a housing and a protrusion having a shape corresponding to the spiral groove on the surface of the pot so that the first and / So that the cleaning efficiency can be further improved.

In one aspect, the present invention provides a hollow fiber membrane module including a hollow fiber membrane bundle including a plurality of hollow fiber membranes, a first potting layer for fixing the upper end of the hollow fiber membrane bundle, a second potting layer for fixing a lower end of the hollow fiber membrane bundle, A hollow fiber membrane bundle including a first potting cap to surround an outer circumferential surface of a potting layer and a second potting cap to surround an outer circumferential surface of the second potting layer; A housing having the hollow fiber bundle received therein and having an outlet port for discharging the concentrated water; An upper cap disposed at an upper end of the housing and including an outlet through which filtered water is discharged; And a lower cap disposed at a lower end of the housing, the lower cap including an inlet through which at least one of air and process water flows, wherein at least one of the first and second potting layers, And is movable up and down within the housing.

In this case, the first and second potting caps are preferably made of a packing material having a water-tight property, and specifically, an O-ring, a plunger, or a rubber bulb rubber bulb) and the like.

The first potting layer and / or the second potting layer may move upward during filtration and may move downward during backwashing.

The separation membrane module may have a spiral groove portion on the inner wall of the housing and a spiral protrusion having a shape corresponding to the shape of the spiral groove portion may be provided on the surfaces of the first and second potting caps . In this case, the first and / or second potting layers may move up and down while rotating according to the flow of the fluid.

Further, the hollow fiber bundle can be separated from the housing.

The housing may further include an inlet port for introducing raw water into one side of the housing.

The separation membrane module according to the present invention is constructed such that the first and second potting layers can flow in the up and down direction according to the flow of the fluid, so that contaminants can be easily removed from the surface of the separation membrane during filtration and backwashing It is excellent in stain resistance.

In the separation membrane module according to the present invention, the hollow fiber membrane bundle is not fixed to the housing and can be separated. Accordingly, it is possible to check the inner state of the hollow fiber membrane, and if necessary, the hollow fiber membrane bundle can be separately cleaned, Can be improved.

In addition, the separation membrane module according to the present invention includes the spiral groove portion on the inner wall of the housing, and the first potting cap and / or the second potting cap have spiral protrusions in the first and second potting caps, When moving, the cleaning efficiency can be further improved by being configured to be rotatable.

1 is a cross-sectional view of a separation membrane module according to a first embodiment of the present invention.
2 is a view showing a state in which the hollow fiber membrane bundle of the present invention is separated from the housing.
3 is a cross-sectional view of a separation membrane module according to a second embodiment of the present invention.
4 is a cross-sectional view of a separation membrane module according to a third embodiment of the present invention.
5 is a cross-sectional view of a separation membrane module according to a fourth embodiment of the present invention.
6 is a view for explaining the moving state of the hollow fiber membrane bundle in the filtration process.
7 is a view for explaining the moving state of the hollow fiber membrane bundle in the backwashing process.

Hereinafter, the present invention will be described more specifically with reference to the accompanying drawings. It is to be understood, however, that the following drawings are provided only to facilitate understanding of the present invention, and the present invention is not limited to the following drawings. Also, the shapes, sizes, ratios, angles, numbers and the like disclosed in the drawings are exemplary and the present invention is not limited thereto. Like reference numerals refer to like elements throughout the specification. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

In the following description of the present invention, detailed description of known related arts will be omitted when it is determined that the gist of the present invention may be unnecessarily obscured by the present invention.

In the case where the word 'includes', 'having', 'done', etc. are used in this specification, other parts can be added unless '~ only' is used. Unless the context clearly dictates otherwise, including the plural unless the context clearly dictates otherwise.

In interpreting the constituent elements, it is construed to include the error range even if there is no separate description.

If the positional relationship between two parts is explained by 'on', 'on top', 'under', 'next to', etc., 'right' or 'direct' One or more other portions may be located.

The positional relationships such as "upper", "upper", "lower", "lower" and the like are described based on the drawings, but do not represent an absolute positional relationship. That is, the positions of 'upper' and 'lower' or 'upper surface' and 'lower surface' may be changed according to the position to be observed.

The first, second, etc. are used to describe various components, but these components are not limited by these terms. These terms are used only to distinguish one component from another. Therefore, the first component mentioned below may be the second component within the technical spirit of the present invention.

FIG. 1 shows a separation membrane module according to a first embodiment of the present invention. 1, the membrane module of the present invention includes a hollow fiber membrane bundle 10, a housing 20, an upper cap 30, and a lower cap 40. As shown in FIG.

The hollow fiber bundle 10 includes a hollow fiber membrane bundle 11, a first potting layer 13, a second potting layer 15, a first potting cap 17 and a second potting cap 19.

The hollow fiber membrane bundle 11 is composed of a plurality of hollow fiber membranes, wherein the hollow fiber membrane is a fiber type separation membrane having a hollow center. The hollow fiber membrane may be hollow fiber membranes of various materials and / or shapes known in the art, and is not particularly limited.

Both ends of the hollow fiber membrane bundle 11 are fixed by the potting layers 13 and 15. For convenience, the potting layer for fixing the upper end of the hollow fiber membrane bundle 11 is referred to as a first potting layer 13, and the potting layer for fixing the lower end of the hollow fiber membrane bundle 11 is referred to as a second potting layer 15. The first and second potting layers 13 and 15 are formed to uniformly arrange and fix a plurality of hollow fiber membranes. For example, the first and second potting layers may be formed of a hollow fiber membrane bundle And then the end of the potting layer is cut to open the end of the hollow fiber membrane. However, the present invention is not limited thereto It is not. In the present invention, the first potting layer 13 and the second potting layer 15 are surrounded by potting caps 17 and 19, respectively. For the sake of convenience, the first potting cap formed on the first potting layer 13 is referred to as a first potting cap 17, and the potting cap formed on the second potting layer 15 is referred to as a second potting cap 19. The first potting cap 17 and the second potting cap 19 are preferably made of a packing material having water tightness. Specifically, the packing material may include various types of water-tight structures such as an O-ring, a plunger, and a rubber bulb, but the present invention is not limited thereto.

In the case of a conventional membrane module using a hollow fiber membrane, it has been common to insert a hollow fiber membrane bundle into a housing, to introduce a liquid adhesive or the like, and then curing the membrane adhesive agent to fix the membrane module to the housing. However, in the present invention, the first potting cap 17 and the second potting cap 19 are formed on the outer peripheral surfaces of the first potting layer 13 and the second potting layer 15, (10) can be moved up and down without being fixed to the housing (20). When the mobility is given to the bundle of hollow fiber membranes as described above, the hollow fiber membranes are shaken in the filtration and backwashing process, and the contaminants on the surface can be shaken, so that the surface of the hollow fiber membrane can be kept clean.

When the potting caps 17 and 19 are used as described above, the hollow fiber bundle 10 is not fixed to the housing 20, and if necessary, the hollow fiber bundle 10 is separated from the housing 20 can do. 2, after removing the upper cap 30 or the lower cap 40 from the housing 20, the hollow fiber bundle 10 is removed from the housing (not shown) by removing the hollow fiber bundle 10 20). Since the hollow fiber bundle 10 is easily separated from the housing 20, it is easy to confirm the film state of the hollow fiber bundle 10. In addition, if it is determined that the hollow fiber membrane bundle 10 is highly contaminated, only the membrane bundle 10 can be washed by putting the membrane bundle 10 into a washing bath, so that the surface state of the hollow fiber membrane can be maintained in a better condition. The life of the battery can also be improved.

The hollow fiber bundle 10 of the present invention constructed as described above is received in the housing 20. The housing 20 may have a hollow inside to allow the hollow fiber bundle 10 to be accommodated therein and may have a tubular shape extending along the longitudinal direction of the hollow fiber bundle 10 and its shape is not particularly limited. For example, the housing 20 may be formed in various shapes such as a cylindrical shape, a square column shape, and a polygonal shape.

Meanwhile, the housing 20 is provided with an outlet port 22 for discharging a fluid (hereinafter, referred to as concentrated water) that concentrates contaminants generated during filtration and backwashing. 1, the outlet port 22 is illustrated as being located at the upper end of the housing 20. However, the present invention is not limited thereto.

Next, an upper cap 30 is provided at an upper end of the housing 20. The upper cap 30 is for sealing the upper region of the housing 20, and various upper caps known in the related art can be used, and the configuration and the shape thereof are not particularly limited. The upper cap 30 is provided with a discharge port 32 for discharging the filtered water filtered through the hollow fiber membrane.

Meanwhile, a lower cap 40 is provided at a lower end of the housing 20. The lower cap 40 is for sealing the lower region of the housing 20, and various lower caps known in the related art can be used, and the configuration and the shape thereof are not particularly limited. An inflow port 42 through which the air and / or the process water to be filtered flows is provided at a lower portion of the lower cap 40. At this time, the inlet 42 may be for introducing air or may be for introducing treated water and air at a time.

Next, a separation membrane module according to a second embodiment of the present invention will be described. 3 shows a separation membrane module according to a second embodiment of the present invention. Referring to FIG. 3, the separation membrane module according to the second embodiment of the present invention further includes an inlet port 24 for introducing raw water into the housing 20. As in the second embodiment, when the inlet 20 is additionally provided with the inlet 20, the raw water can be introduced through the inlet 42 of the lower cap 40 or the inlet port 24 of the housing have. Therefore, since the raw water inflow pipe can be applied both to the device located on the side surface and the device located on the lower surface, there is an advantage that compatibility with existing facilities is excellent. The remaining components except for the configuration of the inflow port 24 are the same as those described in the first embodiment, and a detailed description thereof will be omitted.

Next, a separation membrane module according to a third embodiment of the present invention will be described. 4 shows a separation membrane module according to a third embodiment of the present invention. 4, the separation membrane module according to the third embodiment of the present invention is provided with a spiral groove portion on the inner wall of the housing 20, and the surface of the first and second potting caps 17 and 19 And a spiral protrusion having a shape corresponding to the shape of the helical groove portion. When the inner wall of the housing 20 and the potting caps 17 and 19 are provided with the helical grooves and projections as described above, when the hollow fiber bundle 10 moves according to the water pressure, the grooves and the projections engage with each other, The flow of the hollow fiber membrane becomes stronger than when merely moving up and down, so that the action of shaking out the pollutant agent becomes stronger. As a result, the effect of further improving the stain resistance of the hollow fiber membrane can be obtained. The other components except the spiral groove portion and the spiral protrusion portion are the same as those described in the first embodiment, and a detailed description thereof will be omitted.

Next, a separation membrane module according to a fourth embodiment of the present invention will be described. FIG. 5 shows a membrane membrane according to a fourth embodiment of the present invention. 1, a space is formed in the upper cap 30 and the lower cap 40 to allow the hollow fiber bundle 10 to move. However, the present invention is not limited thereto. That is, as shown in FIG. 5, the separation membrane module according to the present invention has a hollow space for allowing the hollow fiber bundle to move only to one of the upper and lower caps 30 and 40, So that no space is formed. In this case, the first potting layer 13 and the second potting layer 15 may be formed to be fixed to the inside of the upper cap 30 or the lower cap 40 in which no empty space is formed. Thus, when one of the first and second potting layers 13 and 15 is fixed to the upper cap 30 or the lower cap 40, only the non-fixed potting layer moves up and down, The potting layer does not move. 5 (A), the separation membrane module according to the fourth embodiment of the present invention has a void space formed in the upper cap 30, and a second potting layer 15 is formed in the lower cap 30, 5B, a void space may be formed in the lower cap 40, and the first potting layer 13 may be fixed to the upper cap 30, Or the like. The remaining components except for the above-described configuration are the same as those described in the first embodiment, and a detailed description thereof will be omitted.

Next, the contaminant removal mechanism in the filtration process and the backwash process using the separation membrane module of the present invention will be described with reference to FIGS. 6 and 7. FIG. FIG. 6 is a view showing the movement of the hollow fiber bundle during the filtration process, and FIG. 7 is a view showing the movement of the hollow fiber bundle during the backwash process.

First, referring to Fig. 6, the filtration process in the separation membrane module of the present invention will be described. When the filtration process is started, raw water is introduced through the inlet 42 at the lower end of the lower cap 40 and the second potting layer 15 of the hollow fiber bundle 10 is pushed up by the water pressure of the introduced raw water I will go. In this process, as shown in FIG. 6 (A), the hollow fiber membrane is bent and flows, and the pollutants 50 sticking to the lower part of the hollow fiber membrane in the flow process are mainly separated. On the other hand, the introduced process water is filtered through the hollow fiber membrane and then discharged through the discharge port 32 of the upper cap 30. That is, in the filtration process, the fluid flows from the lower end to the upper end within the housing 20, thereby applying hydraulic pressure in the direction from the lower end to the upper end. This water pressure pushes up the first potting layer 13 of the hollow fiber bundle 10 as shown in Fig. 6 (B). In this process, the warped hollow fiber membranes 11 are expanded, A flow occurs in the upper part of the desert, and the contaminants sticking to the upper side of the hollow fiber membrane are separated. On the other hand, since the direction of the hydraulic pressure and the hydraulic pressure are kept constant while the initial operation state is passed and the treatment water is continuously introduced, the hollow fiber membranes do not flow any more and perform the filtration process after the initial state.

6 illustrates a case where both the first and second potting layers move up and down. However, the present invention is not limited thereto. Only one of the first and second potting layers may move up and down. 5 (A), when the second potting layer 15 is formed in a shape fixed to the lower cap 40, the second potting layer 15 15 do not move and only the first potting layer 13 is pushed up to the empty space in the upper cap 30 to flow the hollow fiber membrane 11 and the contaminants are removed by the flow.

Next, the backwashing process in the separation membrane module of the present invention will be described with reference to FIG. When the backwashing process is started, the washing water is introduced into the housing 20 through the discharge part 32 at the upper end of the upper cap 30, and the water is supplied to the first potting layer 11 of the hollow fiber bundle 11 by the water pressure of the inflow washing water. (13) is pushed down. In this process, as shown in FIG. 7 (A), the hollow fiber membrane is bent and flows, and the pollutants 50 adhered to the upper side of the hollow fiber membrane in this process are separated. As the washing water continuously flows into the housing 20, the fluid flows from the upper end to the lower end of the inside of the housing 20, so that the water pressure acts from the upper end to the lower end. This water pressure pushes the second potting layer 15 of the hollow fiber bundle 10 toward the lower cap 40 as shown in FIG. 7 (B). In this process, the hollow fiber membranes 11, And the flow is generated while expanding. This flow causes further contaminants on the lower side of the hollow fiber membrane to fall off. After completion of the washing process, the concentrated water containing contaminants is discharged to the outside through the outlet port 24. [

7 shows a case where both the first and second potting layers move up and down. However, the present invention is not limited to this, and only one of the first and second potting layers may move up and down. 5 (B), when the first potting layer 13 is formed in a fixed form to the upper cap 30, the first potting layer 13 13 do not move and only the second potting layer 15 is pushed down into the empty space in the lower cap 40 to flow the hollow fiber membrane 11 and the contaminants are removed by the flow.

As described above, in the case of the membrane module of the present invention, since the hollow fiber membrane bundle moves up and down in the filtration and backwashing process, contaminants on the surface of the hollow fiber membrane membrane are removed, The upper and lower portions of the hollow fiber membrane can be effectively moved away from the entire surface of the hollow fiber membrane.

10: Hollow fiber bundle
11: Hollow fiber membrane bundle
13: first potting layer
15: second potting layer
17: First port cap
19: second port cap
20: Housing
22: Outflow port
24: inlet port
30: upper cap
32: Outlet
40: Lower cap
42: inlet

Claims

A first potting layer for fixing the upper end of the bundle of hollow fiber membranes, a second potting layer for fixing the lower end of the bundle of hollow fiber membranes, a second potting layer for covering the outer circumferential surface of the first potting layer, And a second port cap formed to surround the outer circumferential surface of the second potting layer;
A housing having the hollow fiber bundle received therein and having an outlet port for discharging the concentrated water;
An upper cap disposed at an upper end of the housing and including an outlet through which filtered water is discharged; And
And a lower cap disposed at the lower end of the housing and including an inlet through which at least one of air and process water flows,
Wherein the first and second potting layers are each moveable up and down in the housing in accordance with the flow of the fluid.

The method according to claim 1,
Wherein the first porting cap and the second porting cap are made of a packing material having water tightness.

3. The method of claim 2,
Wherein the packing material is an O-ring, a plunger, or a rubber bulb.

The method according to claim 1,
Wherein the first and second potting layers each move upward during filtration.

The method according to claim 1,
Wherein the first and second potting layers move downward when backwashing the first and second potting layers, respectively.

The method according to claim 1,
Wherein a spiral groove portion is provided on an inner wall of the housing,
And a spiral protrusion having a shape corresponding to the shape of the spiral groove portion is formed on a surface of the first potting cap and the second potting cap.

The method according to claim 6,
Wherein at least one of the first and second potting layers is movable up and down while rotating according to the flow of the fluid.

The method according to claim 1,
Wherein the hollow fiber membrane bundle is separable from the housing.

The method according to claim 1,
Wherein the housing further comprises an inlet port through which raw water can be introduced into one side.