KR20090035461A - Membrane module for treating water - Google Patents

Abstract

A membrane module for water treatment is provided to reduce manufacturing cost, to offer superior washing efficiency, and to facilitate washing of the membrane module. A membrane module for water treatment includes a supporter(10) and a membrane(20). The membrane is laminated on a supporter. The supporter is dropped, when one end side of the supporter is fixed. The supporter is a resin-coated fiber sheet(12). The resin coated on the fiber sheet is one or more compound selected from an acryl resin, an epoxy-based resin, a melamine resin, polyvinyl alcohol and polyethylene oxide. A channel(15) in which a fluid is flowed is formed on the supporter.

Description

Membrane Module for Water Treatment {MEMBRANE MODULE FOR TREATING WATER}

The present invention relates to a membrane module for water treatment, and more particularly, to include a flexible support, and easy to wash the membrane module, excellent washing efficiency, the thickness is reduced for water treatment can reduce the site of the water treatment plant Membrane module.

Large-scale water treatment plants are used to purify sewage, wastewater, and leachate generated at homes, industrial sites, and agricultural and livestock sites. Water treatment methods include physical treatment, chemical treatment, and biological treatment. In recent years, advanced treatment methods combining all of them have become mainstream. Generally, a water treatment plant is equipped with a membrane filtration device for solid-liquid separation, and the membrane filtration device is provided with a plurality of membrane modules arranged to substantially separate the solid-liquid. In addition, a module including a hollow fiber membrane or a flat membrane is used as the membrane module.

1 and 2 show a flat membrane module for water treatment according to the prior art, Figure 1 is an exploded perspective view, Figure 2 is a combined perspective view of FIG.

1 and 2, a conventional membrane module 1 for water treatment includes a plate-shaped support plate 2, a spacer 3 stacked on both sides of the support plate 2, and the spacer 3. It includes a membrane (4, laminated) laminated on the outer side of the. In addition, a frame 9 for fixing the components is coupled to the edge of the membrane module 1, and a discharge port 8 connected to a pump is formed in the frame 9 positioned at an upper portion thereof. At this time, the spacer 3 has a plurality of holes p formed in the thickness direction thereof. In addition, the support plate 2 has a flow path 2a formed in the vertical direction (length direction) together with the plurality of holes p formed in the thickness direction thereof.

Membrane module 1 is immersed in a well-arranged state in a tank containing contaminated water to separate solid-liquid. Specifically, the suction force of the pump prevents the solids larger than a certain size contained in the contaminated water from passing through the membrane 4, and the solids and the liquids smaller than the predetermined size pass through the membrane 4 and then move the spacers 3. Finally, it is discharged to the outside through the discharge port 8 along the flow path 2a of the support plate 2.

However, the membrane module 1 as shown in FIGS. 1 and 2 has a problem in that the fabrication process is complicated due to the perforation work for forming the flow path 2a and the pore p formed in the support plate 2. Pointed out. In order to improve this, Korean Patent No. 0459038 proposes a flat membrane module configured to protrude and form a plurality of protrusions on the support plate 2 so that the space provided by the protrusions is a flow path 2a.

However, the conventional membrane module 1 including the preceding patent document has the following problems.

The membrane module 1 needs to be washed (backwashed) at a certain point in time. The conventional membrane module 1 is difficult to clean because the support plate 2 and the frame 9 are made of hard plastic material (or metal material). Poor cleaning efficiency. In addition, in the manufacturing process, a process for forming a passage for fluid flow, that is, a flow path 2a and a pore p, in the support plate 2 and the spacer 3 must be accompanied. The conventional membrane module 1 is heavy and thick. That is, the components except for the membrane 4 are made of hard plastic material, and at the same time, the supporting plate 2, the spacer 3 and the frame 9 must be included as components, which is heavy and thick. In addition, there are a lot of components, the manufacturing process is complicated, and there is a problem that the site of the water treatment plant takes a lot by taking up a large volume by the thickness.

Technical challenge

The present invention is to solve the conventional problems as described above, easy to clean the membrane module, excellent washing efficiency, easy to manufacture, the thickness is reduced for the water treatment membrane that can reduce the site of the water treatment plant The purpose is to provide a module.

Technical solution

The present invention to achieve the above object,

Support; And

A membrane laminated on the support,

The support provides a membrane module for water treatment in which deflection occurs when one end is fixed.

At this time, it is preferable that the said amount of deflection is 1/2 or more of the length between a fixed end and a free end.

The said support body is comprised from the plastic corrugated board which has a thickness of 0.2-1.0 mm according to the 1st aspect of this invention. At this time, the plastic corrugated plate is formed with bone and acid, the plate thickness is 0.2 ~ 1.0mm.

Moreover, according to the second aspect of the present invention, the support is composed of a foam or a soft body having a thickness of 1.5 to 6.0 mm.

In addition, the support is composed of a fiber sheet coated with a resin according to the third aspect of the present invention. In this case, the fibrous sheet may be selected from a woven or nonwoven fabric, preferably a woven fabric.

In addition, the support, it is preferable that a channel through which the fluid flowing through the membrane is formed.

Favorable effect

According to the invention, the support for supporting the membrane is flexible. Accordingly, there is an effect that the washing efficiency is increased while being easy to wash (or remove impurities) easily during the cleaning (or aeration). In addition, it is light and the thickness is reduced. In addition, the reduction in thickness makes the volume of the membrane module occupied in the water treatment plant small, which in turn has the effect of reducing the site of the water treatment plant.

1 is an exploded perspective view showing a flat membrane module for water treatment according to the prior art.

FIG. 2 is a combined perspective view of FIG. 1.

3 is an exploded perspective view of a membrane module according to a preferred embodiment of the present invention.

4 illustrates a support constituting the membrane module of FIG. 3.

5 and 6 are exploded perspective views of membrane modules according to another embodiment of the present invention.

7 is a perspective view of the combination of FIG.

8 is a cross-sectional view taken along the line A-A of FIG.

Embodiment for Invention

Hereinafter, with reference to the accompanying drawings will be described the present invention in more detail. The accompanying drawings illustrate exemplary forms of the present invention, which are provided merely to illustrate the present invention in detail, and thus the technical scope of the present invention is not limited thereto.

3 is an exploded perspective view of a membrane module according to a preferred embodiment of the present invention, and FIG. 4 shows a support constituting the membrane module of FIG. 3.

First, referring to FIGS. 3 and 4, the membrane module according to the present invention includes a support 10; And a membrane 20 stacked on both sides of the support 10. The membrane 20 is as usual, a microporous thin membrane is used.

The support 10 supports the membrane 20, which is flexible in accordance with the present invention. In the present invention, the flexibility is defined as the deflection of the free opposite end (free end) occurs when one end of the support 10 is fixed. Specifically, referring to FIG. 4, in the present invention, the flexibility means when one of the ends (fixed end, P ₁ point in FIG. 4) is held in either direction selected from the x direction and the y direction. , Which means that the free opposite end (free end, point P _{2 in} FIG. 4) sags in the z direction. In addition, the said x direction and the y direction mean the horizontal and vertical direction when the support body 10 is located in parallel with the surface as shown in FIG. And the z direction is the thickness direction of the support 10.

At this time, the deflection amount of the support 10 is preferably at least 1/2 of the length between the fixed end and the free end. For example, on the basis of a size of 30 cm (x direction) X 30 cm (y direction), it is preferable that the free opposite end sags 15.0 cm or more. Specifically, when the support 10 is cut to a size of 30 cm (x direction) X 30 cm (y direction), one end of the end of any one direction selected from the x direction and y direction (fixed end, in Figure 4) When the P ₁ point) is fixed, it is preferable that the free opposite end (the free end, the P ₂ point in FIG. 4) sags 15.0 cm or more. More specifically, the support 10 has a size of 30 cm (x direction) X 30 cm (y direction), and the linear distance h falling in the z direction in FIG. 4, that is, the deflection amount is preferably 15.0 to 30.0 cm.

According to the present invention, as the support 10 is flexible as described above, the cleaning efficiency is increased while freely flowing with the membrane 20 during cleaning (or aeration), thereby easily removing impurities.

The support 10 is included in the present invention as long as it has the flexibility defined in the present invention, and preferably has a material and a structure described below.

According to the first aspect of the present invention, the support 10 is composed of a plastic corrugated sheet having a thickness of 0.2 to 1.0 mm. Specifically, as shown in FIGS. 3 and 4, the support 10 is made of a rigid plastic plate having a thickness T0 of 0.2 to 1.0 mm, and the valleys 10a and the mountains 10b are formed. Has a formed structure. At this time, if the thickness T0 of the plastic sheet is less than 0.2 mm, the flexibility is too strong, the holding force (shape retention) is low, and the strength is weak, making it difficult to use as the support 10. And when the thickness T0 of a plastic plate exceeds 1.0 mm, it is difficult to aim at the objective flexibility in this invention, and it is unpreferable.

In addition, the valleys 10a and the mountains 10b formed on the plastic plate have a support force (shape retention) and provide a passage through which the fluid passing through the membrane 20 can easily flow. Specifically, the valley 10a becomes a channel 15 through which the fluid passing through the membrane 20 flows. In this case, the plastic corrugated plate is preferably a total thickness (Tt) including the bone (10a) and the acid (10b) is 1.5 ~ 6.0mm. If the total thickness Tt including the valleys 10a and the hills 10b is less than 1.5 mm, the bearing force (shape retention) decreases due to the small size of the valleys 10a and the hills 10b itself, and the overall thickness Tt is If it exceeds 6.0 mm, the thickness is so thick that the membrane module occupies a large volume in the water treatment plant, which is not preferable.

The support 10, that is, the material of the plastic corrugated sheet is selected from natural resins and synthetic resins, for example, polyvinyl chloride, polyethylene, polypropylene, polyester, polyamide, polyurethane, acrylic resin, epoxy resin and melamine It can be selected from synthetic resins, such as system resin. In addition, the plastic corrugated sheet as a base component as described above, but for flexibility, further includes a plasticizer such as dioctyl phthalate (DOP), dibutyl phthalate (DBP; dibutyl phthalate) according to the type of synthetic resin Can be prepared. In addition, the bone (10a) and the acid (10b) formed on the plastic corrugated plate may be formed during the extrusion process, or may be formed by thermal pressing. Specifically, in manufacturing a plastic corrugated sheet, first, a plastic sheet having a thickness (T0) of 0.2 to 1.0 mm is manufactured, and then the plastic sheet is introduced into a mold in which a valley and an acid are formed, followed by heat pressurization. It can be manufactured so that 10b is formed.

According to the present invention, the support 10 as described above, that is, the plastic corrugated plate to secure the flexibility defined above, easy to clean, improve the cleaning efficiency. In addition, the plastic corrugate is in linear contact with the membrane 20 to increase membrane efficiency. Specifically, the acid 10b of the plastic corrugate contacts the membrane 20 to minimize the membrane contact area, thereby increasing the membrane efficiency. In addition, it is light and can reduce thickness.

According to the second aspect of the present invention, the support 10 is made of a foam or soft body having a thickness of 1.5 to 6.0 mm. In this case, the foam is foamed by adding a foam to a synthetic resin or rubber, the synthetic resin is polyvinyl chloride, polyethylene, polypropylene, polyester, polyamide, polyurethane, acrylic resin, epoxy resin, melamine resin, etc. For example, the rubber is ethylene propylene diene monomer (EPDM; Ethylene Propylene Diene Monomer) rubber, styrene-butadiene rubber (SBR; Stylene-Butadiene Rubber), nitrile rubber (NR; Nitril Rubber), butyl rubber (IIR; Examples include isobutylene-isoprene rubber and nitrile-butadiene rubber. In addition, the soft material may be selected from silicone, rubber, and the like.

The foam (and soft body) has a thickness of 1.5 to 6.0mm, when the thickness is less than 1.5mm, the support force (shape retention) is lowered, making it difficult to use as the support 10. In addition, when the thickness is more than 6.0mm, it is difficult to have the desired flexibility for the present invention, and with the thickness too thick, the volume of the membrane module in the water treatment plant becomes large, which is not preferable. In addition, the foam (and the soft body) is formed with a channel 15 through which the fluid passing through the membrane 20 flows. These channels 15 may be formed by various patterns. Specifically, the channel 15 may be formed by a groove provided in the foam (and soft body). In addition, the channel 15 may be formed by a number of protrusions provided on the surface of the foam (and soft body). At this time, the space existing between the protrusions becomes the channel 15.

5 and 6 are exploded perspective views of a membrane module according to another embodiment of the present invention, FIG. 7 is a perspective view of the combination of FIG. 6, and FIG. 8 is a cross-sectional view taken along line A-A of FIG. 7.

First, referring to FIGS. 5 and 6, the support 10 is formed by coating a resin on the fiber sheet 12 according to the third aspect of the present invention. The fiber sheet 12 is a woven fabric produced by weaving fiber strands, or a non-woven fabric produced by opening fibers onto a web using a carding machine. ), Preferably a fabric. The fibers constituting the fibrous sheet 12 include synthetic fibers and natural fibers, and include, for example, polyester, polyamide, polyacryl, polyurethane, polyvinyl chloride, polyvinylidene chloride, polyethylene, polypropylene, One or more selected from synthetic fibers such as rayon and nylon, and natural fibers such as cotton, wool, linen, silk, and the like. More preferably, the fibrous sheet 12 may be a nylon woven fabric having a small strain or a woven fabric mixed with a polyurethane / polyester yarn.

According to the third aspect of the present invention, in the case where the support 10 is composed of the above-described fibrous sheet 12, the pores through which fluid can pass through the fibrous sheet 12 itself are secured, and thus the flow path 2a as in the prior art (See FIG. 1) or the formation process of the pores (p, see FIG. 1) is eliminated, and manufacturing is easy and cost is reduced. In addition, the fiber sheet 12 has the flexibility defined as described above, it is free to flow in the back washing (back washing) process of the membrane module, it is easy to wash, the amount of air bubbles (and the amount of vortex generated by air) is large High cleaning efficiency. In addition, it is light and can reduce thickness.

In addition, in constructing the support 10, in the case of only the fiber sheet 12, the flexibility is so strong that the support force (shape retention) is inferior. Accordingly, the fiber sheet 12 is coated with a resin for securing the holding force (shape maintenance). By the resin coating, the fiber sheet 12 maintains the shape and rigidity which can be used as the support 10. The method of coating the resin on the fiber sheet 12 is not particularly limited and includes a spray coating method, an impregnation coating method and a brush coating method.

The resin coated on the fiber sheet 12 includes a natural resin and a synthetic resin, and such a resin may be used by diluting in a solvent. The dilution solvent may be selected from water, a hydrocarbon-based organic solvent and the like depending on the type of resin. As the diluting solvent, it is preferable to use water in consideration of working conditions such as coating operation, odor and environmental problems. At this time, the resin is preferably a hydrophilic resin (or a composition containing an additive in the hydrophilic resin). As the resin used for the coating, one or more mixtures selected from the group consisting of acrylic resins, epoxy resins, melamine resins, polyvinyl alcohol, polyethylene oxide, and the like may be used, and polymers thereof may be used. have. In addition, the resin may be usefully used commercially available products such as epoxy resin EM-101-50 (Kukdo Chemical Co., Ltd., Gasan-dong, Geumcheon-gu, Seoul, Korea).

The support 10 according to the third aspect, that is, the resin-coated fiber sheet 12 has a pore through which fluid can pass, so that the fluid passing through the membrane 20 can flow. Although the channel 15 is not required to be formed separately, the channel 15 is preferably formed so that the fluid passing through the membrane 20 can easily flow. In this case, the channel 15 may be formed by bending in the process of curing after the resin coating, or may be provided in the manufacturing process of the fiber sheet 12. More specifically, the channel 15 may be formed by the concave-convex structure of the mold in the process of pressurizing and curing the fiber sheet 12 coated with a resin in a mold having a concave-convex structure on the inner surface. At this time, the inner surface of the mold is a state in which the release agent is coated to facilitate the separation of the support 10, that is, the resin coated fiber sheet 12. In addition, the channel 15 is preferably formed during the weaving of the fiber sheet 12, that is, the weaving of the fabric.

In addition, as shown in Figure 5, the support 10, that is, the resin coated fiber sheet 12 is preferably bent round (R) in a wave form. When the support 10 is bent in a round (R) as described above, the channel 15 in the form of a bone is formed and at the same time linear contact with the membrane 20 to increase the membrane efficiency. In addition, the channel 15 may have a shape of a "c" shape as shown in FIG. 6.

After the support 10 and the membrane 20 described above are stacked, their edges are fixed to each other. Specifically, referring to FIGS. 7 and 8, the edges of the support 10 and the membrane 20 may be fixed by the adhesive 30 or the frame 40, and preferably in four directions (up, down, left, and right). ) Is fixed by the adhesive 30, the frame 40 is further coupled to at least the top of the four directions (up, down, left, right). In this case, the frame 40 coupled to the upper portion has a structure in which an outlet 50 connected to the pump is formed.

In addition, referring to FIG. 5, at least one or more holes 18 may be punctured in at least the lower edge of the four directions (up, down, left, and right) edges of the support 10. 6 illustrates the two holes 18 perforated on both sides of the lower rim. Holes 28 may also be drilled in the membrane 20 at positions corresponding to the holes 18. Through the perforated holes 18 and 2 as described above, a plurality of membrane modules can be connected using fasteners such as rivets and pins. In addition, the support 10 may be formed with a plurality of passage holes penetrated in the thickness direction (z direction in Figure 4).

Membrane module according to the present invention described above is installed in the immersion filtration device of the water treatment plant, a plurality of squarely arranged in the form of a flat membrane as usual. In addition, the membrane module according to the present invention can be installed in the form of a cartridge as it has flexibility.

As described above, according to the present invention, the support 10 for supporting the membrane 20 ensures flexibility, and freely flows during washing (or aeration), so that washing is easy (impurity is easily removed) while washing efficiency Is increased. Further, in contrast to the prior art consisting of the support plate 2 (see FIG. 1) and the spacer 3 (see FIG. 1), the support 10 is made of plastic, foam (soft) or fibrous sheet 12 to be light. In addition, the number of constituent members is small, and in particular, in the case of the fiber sheet 12, since it has its own pores, no separate flow path forming work is required, and the spacer 3 is not necessary. As a result, the thickness is reduced, and the thickness decreases so that the volume of the membrane module in the water treatment plant becomes small, which in turn reduces the site of the water treatment plant.

Claims (11)

Support; And A membrane laminated on the support, When the support is fixed to one end, the membrane module for water treatment, characterized in that the deflection occurs. The method of claim 1, The support body is a membrane module for water treatment, characterized in that the deflection amount is at least 1/2 of the length between the fixed end and the free end. The method of claim 1, The support body is a plastic corrugated board having a thickness of 0.2 to 1.0 mm. The method of claim 1, The support is a membrane module for water treatment, characterized in that the foam or soft body having a thickness of 1.5 to 6.0mm. The method of claim 1, The support is a membrane module for water treatment, characterized in that the resin is coated fiber sheet. The method of claim 5, Membrane module for water treatment, characterized in that the fiber sheet is a woven or non-woven fabric. The method of claim 3, The resin coated on the fiber sheet is a membrane module for water treatment, characterized in that one or two or more selected from acrylic resin, epoxy resin, melamine resin, polyvinyl alcohol and polyethylene oxide. The method according to any one of claims 1 to 7, The support is a membrane module for water treatment, characterized in that the channel through which the fluid flowing through the membrane is formed. The method according to any one of claims 1 to 7, Membrane module for water treatment, characterized in that the support and the edge of the membrane is fixed by an adhesive or a frame. The method according to any one of claims 1 to 7, Membrane module for water treatment, characterized in that the edge of the support and the membrane is fixed by an adhesive, the frame is coupled to the top. The method according to any one of claims 1 to 7, The support is a membrane module for water treatment, characterized in that a hole into which the fastener is inserted.

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