KR20190060595A - Submerged membrane cassette and water-treatment apparatus comprising the same - Google Patents

Abstract

The separation membrane module of the present invention comprises: a separation membrane separating treated water from raw water; And a header for restricting at least one end of the separation membrane in fluid communication with the separation membrane and collecting the treated water treated from the separation membrane, wherein the header has a bending structure in which the hill and the valleys are alternately formed along the longitudinal direction do.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a membrane module and a water treatment apparatus including the membrane module,

The present invention relates to a separation membrane module and a water treatment apparatus including the same. More specifically, the present invention relates to a separation membrane module capable of maximizing the cleaning effect by an acid group and a water treatment apparatus including the separation membrane module.

A process of passing a desired substance through a separation membrane and removing an undesired substance, or conversely, a process of separating and recovering a desired substance through an unwanted substance is referred to as a membrane separation process.

Generally, when a water treatment apparatus is constructed by combining a plurality of membrane modules, a cassette is manufactured by arranging modules produced by fixing the membrane in the same rectangular shape to a header having a relatively long rectangular shape on one side in a row . At this time, in order to prevent the membrane fouling, a diffuser is disposed in a direction parallel to the hollow fiber membrane at the bottom of the module, and the bubbles generated in the diffuser usually contact the membrane in a circular or elliptical shape to remove contaminants.

1 is a schematic view of a water treatment apparatus using a conventional separation membrane module. As shown in FIG. 1, in the conventional water treatment apparatus 101, a plurality of unit separation membrane modules 51 are arranged in parallel. The unit separation membrane module 51 includes a separation membrane 21 in which a plurality of hollow fiber membranes are arranged in a sheet shape and a rectangular header 11 at the end of the separation membrane. The header 11 collects the treated water and discharges the treated water to the collecting pipe 31.

2 (a) and 2 (b) are plan views of the water treatment apparatus of FIG. 1 observed from above. As shown in FIG. 2 (a), the diffuser holes 41 are located between the unit separation membrane modules 51 and the bubbles B generated in the diffuser holes 41 are introduced into the pre- It is split into several small bubbles and the effect of the acidity is reduced. When the bubble (B1) showing the direction and intensity of the climatic direction is seen, the broken bubble acts strongly on the adjacent separation membrane and relatively weakly acts on the separation membrane located away from the acidification hole, . As a result, the fatigue of the separator becomes different. As shown in FIG. 2 (b), when the submerged cassette is installed in a water tank, the modules are arranged in parallel with the flow direction of the raw water. In this case, The contaminants may be continuously deposited on the surface of the separator to lower the water permeability.

Therefore, it is necessary to develop a separation membrane module capable of maximizing the cleaning effect by an anionic group.

Related prior art is U.S. Published Patent Application No. 2007-0209994.

An object of the present invention is to provide a separation membrane module capable of maximizing the cleaning effect by an acid group and a water treatment apparatus including the separation membrane module.

Another object of the present invention is to provide a separation membrane module capable of preventing the accumulation of contaminants and discharging contaminants to the outside of the module, and a water treatment apparatus including the same.

It is still another object of the present invention to provide a separation membrane module capable of achieving a uniform cleaning effect by reaching a certain strength of bubbles with respect to each separation membrane and being able to maintain the fatigue of the separation membrane constantly and thereby improving durability, And a water treatment apparatus.

One aspect of the invention relates to a membrane module. The separation membrane module includes: a separation membrane separating treated water from raw water; And a header for restricting at least one end of the separation membrane in fluid communication with the separation membrane and collecting the treated water treated from the separation membrane, wherein the header has a bending structure in which the hill and the valleys are alternately formed along the longitudinal direction do.

In an embodiment, the separation membrane is arranged to have a bending structure along the header.

In a specific example, the curvature radius R of the peak or valley is characterized by satisfying the following formula 1:

[Formula 1]

(Where R is the radius of curvature and I is half the unit straight line length of the mountain or valley)

In one embodiment, the radius of curvature of the mountain and valley may be the same.

In another embodiment, the radius of curvature of the hill and valleys may not be the same.

In an embodiment, the total sum of the peak and the valley may be 2 to 20.

In an embodiment, the width of the separator fixed to the header may be 10 to 60 mm.

Another aspect of the present invention relates to a water treatment apparatus. The water treatment apparatus includes a plurality of separation membrane modules; And a diffusion device provided below the separation membrane module, wherein the separation membrane module is a separation membrane module having the bent structure described above.

In an embodiment, the plurality of the separation membrane modules are arranged in parallel with each other with the unit separation membrane modules spaced from each other. The unit separation membrane modules are arranged such that the adjacent unit separation membrane modules and the bending structures are symmetrical to each other.

In an embodiment, between the unit separation membrane modules, a narrow space, which is a zone having a maximum gap between separation membranes and a minimum space between separation membranes, may be alternately formed.

And an acid diffusion hole through which the air bubbles are discharged may be located in the cavity.

The size of the bubbles discharged from the diffuser hole may be larger than the size of the cavity.

In an embodiment, the bubbles discharged from the acid orifice may include bubbles satisfying the following formula 2:

[Formula 2]

(Where D is the diameter of the inscribed circle of the cavity, and d is the diameter of the bubble)

The diffuser can generate intermittent pulsed bubbles.

The water treatment apparatus is characterized in that raw water is arranged to flow along the longitudinal direction of the header, a vortex is formed in the cavity, and a maximum flow velocity is provided in the valleys.

The present invention can maximize the cleaning effect by the acid group, prevent the accumulation of contaminants, easily discharge the contaminants to the outside of the module, achieve uniform bubbles with respect to each separation membrane, And the fatigue of the separation membrane can be maintained constant, thereby improving the durability of the separation membrane module and the water treatment apparatus including the separation membrane module.

1 is a schematic view of a water treatment apparatus using a conventional separation membrane module.
FIG. 2 (a) is a plan view of the water treatment apparatus of FIG. 1 viewed from above, and FIG. 2 (b) is a schematic view of a conventional water treatment apparatus.
3 is a schematic diagram of a membrane module according to one embodiment of the present invention.
4 is a plan view of the separator module of the present invention observed from above.
5 is a schematic view of a water treatment apparatus using a membrane module according to one embodiment of the present invention.
Fig. 6 is a plan view of the water treatment apparatus of Fig. 5 viewed from above. Fig.
Fig. 7 schematically shows an installation form of the water treatment apparatus of Fig. 6;

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 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.

In the figure, the x-axis is the longitudinal direction of the header, the z-axis is the width direction of the header, and the y-axis is a separation membrane perpendicular to the paper.

Hereinafter, a separation membrane module according to an embodiment of the present invention and a water treatment apparatus including the same will be described with reference to FIGS. 3 and 4. FIG.

3 is a schematic diagram of a membrane module according to one embodiment of the present invention. As shown in FIG. 3, the separation membrane module 50 of the present invention includes a separation membrane 20 for separating treated water from raw water; And a header (10) for restricting at least one end of the separation membrane in fluid communication with the separation membrane and collecting the treated water processed from the separation membrane. At one side of the header 10, a collecting pipe 30 through which treated water is discharged is formed.

4 is a plan view of the separation membrane module 50 observed from above. The header 10 has a curved structure in which a crest portion and a trough portion are alternately formed along the longitudinal x-axis. The separator extends in the y-axis perpendicular to the paper plane.

In a specific example, the curvature radius R of the mountain or valley is characterized by satisfying the following formula 1:

[Formula 1]

(Where R is the radius of curvature and I is half the unit straight line length of the mountain or valley)

If it is out of the above range, the shape of the cavity described below becomes flat oval (or peanut shaped), so that the bubbles coming out of the air diffuser can not reach the membrane evenly.

In one embodiment, the radius of curvature of the mountain and valley may be the same. In another embodiment, the radius of curvature of the hill and valleys may not be the same.

In an embodiment, the total sum (N) of the hill part and the valley part can be determined in consideration of the length of the header and the number of diffuser holes of the diffuser. In a specific example, in the unit separation membrane module, the total sum of the hill part and the trough part may be 2 to 20 pieces. If the number is less than 2, it is difficult to make a symmetrical structure. If the number is more than 20, the size of the cavity becomes small, so that it is difficult to expect the cleaning effect by the anionic group mentioned in the present invention. Preferably 4 or more and 16 or less, more preferably 6 or more and 12 or less.

As the header 10 has a bending structure, the separation membrane 20 bound to the header is also arranged to have a bending structure along the header 10.

Although the header 10 is shown only in the lower portion of the separation membrane 20, it is not limited thereto. In one embodiment, the header 10 may be formed at both the upper and lower ends of the separation membrane 20. In another embodiment, the header 10 may be formed only at the upper end of the separation membrane 20.

The separation membrane 20 has a plurality of hollow fiber membranes arranged in a bundle, and the longitudinal direction (y axis) of the hollow fiber membrane is arranged perpendicular to the longitudinal direction (x axis) of the header. The width (w) of the separation membrane 20 fixed to the header 10 may be 10 to 60 mm. Contaminants can be easily removed by bubbles generated in the air diffuser in the above range. If the width of the separation membrane is narrower than 10 mm, the effective membrane area of the separation membrane mounted on the unit module is small and more modules based on the same processing capacity are required. On the other hand, if the width of the bundle is wider than 60 mm, it is difficult to remove contaminants between the separating membranes due to an acid group, and it is difficult to achieve the expected effect. Preferably, the width (w) of the separation membrane is in the range of 15 to 50 mm, more preferably 20 to 40 mm.

Another aspect of the present invention relates to a water treatment apparatus. 5 is a schematic view of a water treatment apparatus using a membrane module according to one embodiment of the present invention. As shown in FIG. 5, the water treatment apparatus of the present invention includes the separation membrane module 50 as a unit separation membrane module, which is arranged in parallel with a plurality of spaced apart from each other. .

6 is a plan view of the water treatment apparatus observed from above. As shown in FIG. 6, the plurality of separation membrane modules are arranged in parallel with each other with the unit separation membrane modules spaced from each other. The unit separation membrane modules are arranged so that the neighboring unit separation membrane modules and the bending structures are symmetrical to each other. For example, the second separation membrane module 50b is arranged in parallel so that the neighboring first and third separation membrane modules 50a and 50c and the bending structure are symmetrical to each other. That is, since the second separator module 50a and the second separator module 50b adjacent to each other are arranged so as to be symmetrical with each other between the second separator module 50b and the third separator module 50c, As described above, the cavity Z2, which is the region having the maximum gap between the separation membranes, and the narrow portion Z1, which is the region having the minimum gap between the separation membranes, can be alternately formed. The cavity Z2 has a convex upper and lower lenticular shape, and the cavity Z2 may be provided with a diffuser hole 40 through which air bubbles are discharged.

As described above, the separation membrane module according to the present invention is different from the conventional separation membrane module of the linear type, and the flow of the separation membrane is restricted to some extent by the plurality of bending, so that the separation membrane can be maintained uniformly without being shifted to one side. Therefore, the bubbles generated in the lower part become the moving passage, and the contaminants can be easily discharged to the outside of the module by the upward flow. On the other hand, even if the flow of the separation membrane is restricted by the bending, since the length of the separation membrane is longer than the length of the header, it is possible to flow to some extent vertically and horizontally by the rising bubbles, Can be prevented from accumulating.

Referring again to FIG. 6, bubbles A generated at the bottom of the cavity produced by the bending of the symmetrical structure can reach the separation membrane without breaking because there is no interference of the header, Can be maximized. In addition, as shown in A1 showing the direction and intensity of the acid, the bubble generated in the cavity is almost uniform in the distance from the peripheral separator, so that the bubbles having a constant intensity reach each separator, The fatigue received by the separator can be kept constant.

The size of the bubbles discharged from the diffusion holes may be larger than the size of the cavity. In this case, contaminants accumulated in the cavity outer membrane can be removed by not only the upward flow but also the flow from the inside to the outside of the cavity, And the contaminants that are shaved toward the outside are discharged to the outside of the module through the upward flow of the bubbles generated in the side cavity. In addition, when the air diffuser generates intermittent pulsed bubbles, it is possible to completely remove contaminants which may accumulate even in a narrow portion of the cavity, thereby maximizing the cleaning effect.

In an embodiment, the bubbles discharged from the acid orifice may include bubbles satisfying the following formula 2:

[Formula 2]

(Where D is the diameter of the inscribed circle of the cavity, and d is the diameter of the bubble)

If the diameter d of the bubble is smaller than 1/2 of the diameter of the inscribed circle of the cavity D, the effect of improving the acidity is insignificant. If the diameter is larger than 3 times the diameter of the inscribed circle of the cavity D, The development can be deteriorated due to the development. Preferably, the diameter (d) of the bubble is 1 to 2.5 times, more preferably 1.5 to 2 times the diameter (D) of the inscribed circle of the cavity.

In the present invention, the size of bubbles can be measured by taking a picture with a high-speed camera when the bubbles are discharged from the diffuser hole, and when a plurality of bubbles are gathered to form one cluster, the longest length is regarded as the bubble diameter.

The diffuser can generate intermittent pulsed bubbles.

In the water treatment apparatus of the present invention, the longitudinal direction (x axis) of the header is parallel to the flow direction of the raw water . Fig. 7 schematically shows an installation form of the water treatment apparatus of the present invention. As shown in Fig. 7, the flow rate increases at a narrow interval z1, and contaminants accumulate on the surface of the separation membrane due to the vortex generated by the effect of decreasing the flow rate in the cavity z2 where the interval widens Can be prevented. With this effect, a common wastewater treatment process having a transfer amount larger than the treated water production amount can be performed without addition of a device such as a pump, and it can be efficiently applied even in a water treatment process in which the effect of preventing the contamination by vortex is insufficient or the amount of transfer is not sufficient. In some cases, a pump or the like may be additionally installed to flow the raw water more regularly, thereby maximizing the above effects. On the other hand, as the vortex generation principle increases, the flow rate of the portion where the cavity is narrowed increases, and the probability of accumulation of contaminants is lowered.

In an embodiment, the diffuser (not shown) is for releasing air bubbles during membrane cleaning and is typically located at the bottom of the membrane module. The diffuser may be used without limitation in various devices used in the technical field, and the constitution thereof is not particularly limited. For example, the air diffuser can discharge air bubbles of uniform size, and in other embodiments, the air diffuser can emit pulsed air bubbles in accordance with certain rules, without the uniform size of the bubbles.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (15)

A separation membrane separating the treated water from the raw water; And
And a header for restricting at least one end of the separation membrane in fluid communication with the separation membrane and collecting the treated water processed from the separation membrane,
Wherein the header has a curved structure in which the crests and valleys are formed alternately along the longitudinal direction.
The separation membrane module according to claim 1, wherein the separation membrane is arranged to have a bending structure along the header.
2. The separation membrane module as claimed in claim 1, wherein a radius of curvature (R) of the crests or valleys satisfies the following formula:
[Formula 1]

(Where R is the radius of curvature and I is half the unit straight line length of the mountain or valley)
The separation membrane module according to claim 3, wherein the radius of curvature of the peak and the valley are the same.
4. The membrane module as claimed in claim 3, wherein the radius of curvature of the peak and the valley are not the same.
The separation membrane module according to claim 1, wherein the total sum of the peak and the valley is 2 to 20.
2. The membrane module of claim 1, wherein the width of the separator fixed to the header is 10 to 60 mm.
A plurality of separation membrane modules; And
And a diffusion device provided at a lower portion of the separation membrane module,
Wherein the membrane module is the membrane module of any one of claims 1 to 7.
9. The apparatus of claim 8, wherein the plurality of membrane modules
The unit separation membrane modules are arranged in parallel with each other at an interval,
Wherein the unit separation membrane module is arranged such that neighboring unit separation membrane modules and the bending structure are symmetrical to each other.
9. The water treatment system according to claim 8, wherein the unit separation membrane modules are alternately formed with a cavity having a maximum gap between the separation membranes and a narrowed portion having a minimum gap between the separation membranes.
11. The water treatment apparatus according to claim 10, wherein the diffuser hole is located in the cavity.
12. The water treatment apparatus according to claim 11, wherein the bubbles discharged from the acid orifice include bubbles satisfying the following formula (2)
[Formula 2]

(Where D is the diameter of the inscribed circle of the cavity, and d is the diameter of the bubble)
13. The water treatment system according to claim 12, wherein the size of the bubbles discharged from the acid-philic hole is larger than the size of the cavity.
12. The water treatment apparatus according to claim 11, wherein the air diffusing device generates intermittent pulsed air bubbles.
11. The water treatment apparatus according to claim 10, wherein the raw water is arranged to flow along the longitudinal direction of the header, vortexes are formed in the cavities, and maximum flow velocities are provided in the corners.

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