KR102323141B1 - Tublar filter for water-treatment and water-treatment filter module comprising thereof - Google Patents

Abstract

A tubular filter for water treatment is provided. The tubular filter according to an embodiment of the present invention is a tubular filter through which both ends are penetrated, and the filtration flow is formed from the outside to the inside or from the inside to the outside of the tubular filter, and the first fiber web having different average pore diameters from the outside to the inside. And it is implemented including a filter media layer comprising a second fiber web. According to this, compared to the flat membrane, the effective filtration area is significantly improved, the filtration efficiency is high, but contaminants are not easily collected on the filter surface, backwashing is easy, and stable water flow and performance can be maintained in the long term. In addition, since it has a multi-distributed pore structure, there is an advantage that various products can be implemented according to the purpose of use. In addition, the durability of the filter is extended due to its excellent durability, and as the durability of the filter is maintained even during backwashing, it can be widely applied to the water treatment field.

Description

Tubular filter for water treatment and filter module for water treatment including the same

The present invention relates to a tubular filter, and more particularly, to a tubular filter for water treatment.

Conventional solid-liquid separation filter media mainly used non-woven fabric, fibrous flat membrane, or hollow fiber membrane. However, flat membrane mainly purifies raw water with large particles. there is In addition, since it acts as a depth filter and collects particles on the outer surface of the filter medium, it is difficult to exhibit further performance and must be discarded, thereby adversely affecting economic efficiency and environmental pollution. Furthermore, the filtration area per unit volume is not large, the efficiency of the filtration system is not good due to the low permeate flow rate and flow rate, and backwashing is difficult.

The conventional UF/MF (ultra-filtration/micro-filtration) hollow fiber membrane has excellent filtration precision, but has little cleaning effect on contamination, and during long-term operation, particles or suspended matter in raw water contaminate the hollow fiber membrane bundle There was a problem in that it is easy to cause short-circuiting, and backwashing was not easy due to the operating conditions.

These conventional flat membranes or hollow fiber membranes have problems with low filtration efficiency compared to initial installation cost and high maintenance cost due to membrane replacement and washing due to low permeation flow rate, filtration power, and clogging of the membrane.

Registered Patent Publication No. 10-1908704

The present invention was devised in consideration of the above points, and compared to flat membranes, the effective filtration area is significantly improved, contaminants are not easily collected on the filter surface, and backwashing is easy, and long-term stable water flow and performance are achieved. An object of the present invention is to provide a tubular filter for water treatment that can be maintained and a filter module for water treatment including the same.

Another object of the present invention is to provide a tubular filter for water treatment that has excellent durability, so that the replacement cycle of the filter is extended, and the durability of the filter is maintained even during backwashing, and a filter module for water treatment including the same.

In order to solve the above problems, the present invention is a tubular filter having both ends penetrated, in which a filtration flow is formed from the outside to the inside or from the inside to the outside, and the first fiber web and the second fiber web having different average pore diameters from the outside to the inside direction To provide a tubular filter comprising a media layer comprising a two-fiber web.

According to an embodiment of the present invention, the first fiber web - the second fiber web, the second fiber web - the first fiber web, the first fiber web - the second fiber web - the first fiber from the outside to the inside of the tubular filter The web, or the second fibrous web, the first fibrous web, and the second fibrous web, may be arranged in the order.

In addition, the tubular filter is formed by winding a slitting yarn diagonally with respect to the first direction to form a constant inner diameter along the first direction, and the slitting yarn is a laminate in which the first fiber web and the second fiber web are integrated. It may be cut to a predetermined width.

In addition, the slitting yarn is wound so that certain portions of the opposing edges overlap each other, and the overlapping portions may be bonded through heat or ultrasonic waves, or may be bonded through a separate adhesive component.

In addition, the first fiber web is a fiber web having a pore diameter of 10 to 100 μm formed of first fibers having a diameter of 5 to 30 μm, and the second fiber web is a pore diameter formed by second fibers having a diameter of 0.1 to 1.0 μm. It may be a fibrous web of 0.1 ~ 1.0㎛.

In addition, the first fibrous web may have a larger average pore diameter than the second fibrous web, the first fibrous web may have a thickness of 50 to 200 μm, and the second fibrous web may have a thickness of 5 to 100 μm.

In addition, the first fiber web is formed by including at least one compound selected from the group consisting of polyolyepine-based, polyvinyl-based, polystyrene-based, polyester-based, fluorine-based, polyamide-based, polysulfone-based, and cellulose, The second fiber web is at least one selected from the group consisting of polyvinylidene fluoride, polyacrylonitrile, polyamide, polyurethane, polyvinyl alcohol, polyvinyl chloride, polyethersulfone (PES) and polysulfone (PS). compounds may be formed.

In addition, the slitting yarn may have a width of 10 to 50 mm.

In addition, the first fiber web may be any one selected from the group consisting of a melt blown nonwoven fabric, a spunbond nonwoven fabric, a thermal bond nonwoven fabric, a chemical bond nonwoven fabric, and a Ÿ‡ laid nonwoven fabric.

In addition, the present invention provides a filter module for water treatment having a plurality of tubular filters according to the present invention arranged side by side inside the housing.

Compared to the flat membrane according to the present invention, the effective filtration area is significantly improved, the filtration efficiency is high, but contaminants are not easily collected on the filter surface, backwashing is easy, and stable water flow and performance can be maintained in the long term. In addition, since it has a multi-distributed pore structure, there is an advantage that various products can be implemented according to the purpose of use. In addition, the durability of the filter is extended due to its excellent durability, and as the durability of the filter is maintained even during backwashing, it can be widely applied to the water treatment field.

1 is a perspective view of a filter module for water treatment according to an embodiment of the present invention and a schematic cross-sectional view along XX' boundary line;
2 is a perspective view of a tubular filter according to an embodiment of the present invention and a schematic cross-sectional view and a partial enlarged view along the boundary line XX';
3 is a schematic diagram showing the fluid flow of a tubular filter according to an embodiment of the present invention;
4 is a cross-sectional SEM photograph of a filtration layer constituting a tubular filter according to an embodiment of the present invention;
5 is an SEM photograph of a second fiber web included in a tubular filter according to an embodiment of the present invention;
6 is a graph showing the pore diameter distribution of the filtration layer constituting the tubular filter according to an embodiment of the present invention;
7 is a photograph of a manufacturing process of a laminate and a slitting company, which are intermediates for manufacturing a tubular filter according to an embodiment of the present invention;
8 is a schematic diagram showing a method of manufacturing a tubular filter according to an embodiment of the present invention, and
9 is a photograph of a tubular filter according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings, the embodiments of the present invention will be described in detail so that those of ordinary skill in the art to which the present invention pertains can easily implement them. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. In order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and the same reference numerals are added to the same or similar elements throughout the specification.

Referring to FIG. 1 , the filter module 1000 for water treatment according to the present invention includes a housing 1 and a plurality of tubular filters 100 accommodated in the housing.

The housing 1 includes a receiving part 10 in which the tubular filter 100 is accommodated, an inlet 30 in which raw water is introduced, a returned water outlet 20 in which unfiltered raw water is discharged, and the tubular filter. It includes a filtered water discharge unit 40 through which the filtered water is discharged through (100).

The shape, size, material, specific structure, etc. of the housing 1 may be appropriately adopted or changed according to the purpose known in the art, so the present invention is not particularly limited thereto.

Meanwhile, although not shown in FIG. 1 , the housing 1 may further include an air nozzle unit capable of injecting air bubbles performing a washing function during backwashing. For example, the air nozzle unit may include backwashing water during backwashing. It may be located on the side of the backwash water inlet (not shown) to be used, or it may be located on the side of the filtered water discharge unit 40 when the backwash water is introduced through the filtered water discharge unit 40 . In addition, in order to improve the backwashing effect, a plurality of air nozzle units may be provided at different positions in the housing, and the positions may also be changed according to a specific housing design, so the present invention is not particularly limited thereto.

A plurality of the tubular filter 100 is provided in the receiving part 10 of the housing 1, and each of the tubular filters 100 may be arranged to be arranged side by side in one direction. At this time, the number of tubular filters 100 provided in the accommodating part 10 and the spacing between adjacent tubular filters 100 can be appropriately modified in consideration of the size of the housing, the desired flow rate, filtration efficiency, and the performance of the tubular filter. The present invention is not particularly limited in this respect.

The tubular filter 100 has a structure in which both ends are penetrated as shown in FIGS. 2 to 3 . In addition, the raw water (A) flowing in from the outside has a filtration flow that passes through the tubular filter 100 in the inward direction, and the filtered water (B) located inside the tubular filter 100 is in the direction of any one end of the tubular filter 100 . , for example, may flow toward the direction in which the filtered water discharge unit 40 is located.

In addition, the tubular filter 100 includes a filter media layer including the first fiber web 120 and the second fiber web 110 from the outside to the inside, the first fiber web 120 and the second fiber web. The average pore diameter of (110) is different from each other, and through this, a multi-distributed pore structure can be implemented. Alternatively, various pore structures such as a pore structure in which the pore diameter decreases from the outside to the inside of the tubular filter 100, a pore structure in which the pore diameter increases, or a pore diameter structure in which the pore diameter increases and then decreases again, can be easily designed.

The first fiber web 120 and the second fiber web 110 are arranged in the order of the first fiber web 120 and the second fiber web 110 from the outside to the inside of the tubular filter 100 as shown. can be Alternatively, the second fiber web 110 - the first fiber web 120, the first fiber web 120 - the second fiber web 110 from the outside to the inside of the tubular filter 100 differently from that shown in FIG. 2 . - The first fibrous web 120, or the second fibrous web 110 - The first fibrous web 120 - The second fibrous web 110 may be arranged in the order.

Hereinafter, a case in which the first fibrous web 120 has a larger pore diameter than the second fibrous web 110 will be described with reference to FIGS. 4 to 6 .

The first fiber web 120 may be formed of fibers having a large fineness in order to have a larger pore size structure than that of the second fiber web 110. It can be performed, and the second fiber web 110, which is responsible for the main filtering function, can also perform a function as a support layer that can maintain the tube shape. The first fiber web 120 may be used without limitation in the case of a conventional nonwoven fabric, for example, any one selected from the group consisting of a melt blown nonwoven fabric, a spunbond nonwoven fabric, a thermal bond nonwoven fabric, a chemical bond nonwoven fabric, and a Ÿ‡ laid nonwoven fabric can be

In addition, the first fiber web 120 may be made of a conventional non-woven fabric, for example, made of polyoljepin-based, polyvinyl-based, polystyrene-based, polyester-based, fluorine-based, polyamide-based, polysulfone-based and cellulose. It may be formed by including any one or more compounds selected from the group.

In addition, the first fiber web 120 may be, for example, a fibrous web formed of first fibers 121 having a diameter of 5 to 30 μm and having a pore size distribution of 10 to 100 μm. In addition, it may be implemented with a thickness of 50 ~ 200㎛, through which sufficient mechanical strength can be expressed and at the same time it can be advantageous to perform an auxiliary filtration function without disturbing the flow of raw water.

In addition, the second fiber web 110 is a layer performing a main filtering function, and for example, a fibrous web having a pore diameter of 0.1 to 1.0 μm, formed of the second fibers 111 having a diameter of 0.1 to 1.0 μm. have. In addition, the thickness may be 5 ~ 100㎛, there is an advantage that can express a more elevated effect on the filtration efficiency through this.

The second fiber web 110 is composed of the second fibers 111 of fineness, and may be manufactured using a method for manufacturing fibers having a fineness of 1 μm or less. It can be manufactured by using the method, or it can be manufactured through electrospinning.

In addition, the second fiber web 110 is made of polyvinylidene fluoride, polyacrylonitrile, polyamide, polyurethane, polyvinyl alcohol, polyvinyl chloride, polyethersulfone (PES) and polysulfone (PS). It may be formed by including any one or more compounds selected from the group. However, the present invention is not limited thereto, and in the case of a compound that can be electrospun and can be formed into a fiber, it can be used without limitation.

On the other hand, the first fibrous web 120 and the second fibrous web 110 may be jointly implemented. For example, they may be fused to each other through heat or ultrasonic waves, or a separate adhesive component may be interposed between the first fiber web 120 and the second fiber web 110 to be integrated. In the case of integration through fusion, the first fiber web 120 and/or the second fiber web 110 may further include heterogeneous fibers that facilitate fusion, and the heterogeneous fibers are collectively referred to as LM yarns in the art. It may include a low-melting component that is, the low-melting component may be a polyester-based or polyolefin-based. In addition, the heterogeneous fiber may be a fiber of a single low-melting component, or a fiber having a core-shell structure in which a low-melting-point component forms a shell by coating the outer surface of a core component having a supporting function. In addition, the separate adhesive component may be used without limitation in the case of a material used as an adhesive component in the filter field, and the present invention is not particularly limited thereto.

7 and 8, the tubular filter 100 is wound in an oblique line with respect to the first direction to form a constant inner diameter along the first direction, for example, the longitudinal direction of the tubular filter (500). It may be formed by taking. At this time, in order to more easily form a constant inner diameter, the cylindrical support 600 may be used. In addition, the slitting yarn 500 can maintain the structure of the tubular filter by forming the bonding surface H after being wound so that certain portions of the opposite edges overlap each other.

The slitting yarn 500 may be obtained by cutting a laminate 400 in which the first fiber web 120 and the second fiber web 110 are integrated to a predetermined width. The width of the slitting yarn 500 is It may be 10 to 50 mm. If the width is less than 10 mm, the area of the bonding surface (H), which is a portion where the edges are overlapped and bonded during subsequent manufacture of the tubular filter, increases, and thus there is a fear that the effective area of the filter is significantly reduced. In addition, if the width exceeds 50 mm, the mechanical strength of the tubular filter is lowered, and it may be difficult to maintain the through structure.

In addition, the overlapping edge portion of the slitting yarn 500 may be bonded through heat or ultrasound, or may be bonded through a separate adhesive component. The present invention is not particularly limited thereto because conditions known in the art may be employed and appropriately changed, and a known adhesive component may be employed.

Although one embodiment of the present invention has been described above, the spirit of the present invention is not limited to the embodiments presented herein, and those skilled in the art who understand the spirit of the present invention can add components within the scope of the same spirit. , changes, deletions, additions, etc. may easily suggest other embodiments, but this will also fall within the scope of the present invention.

1000: filter module for water treatment 1: housing
20: return water discharge unit 30: raw water inlet
40: filtered water discharge unit 100: tubular filter
110: second fiber web 120: first fiber web
400: a laminate of the first fiber web and the second fiber web 500: slitting yarn
600: cylindrical support

Claims (10)

A slitting yarn having a filter media layer in which the first fiber web and the second fiber web are integrated is wound diagonally with respect to the first direction so that the edges in the width direction partially overlap, so that both ends are penetrated and have a constant inner diameter along the first direction. is formed to
The first fiber web is formed of first fibers having a diameter of 5 to 30 μm, a pore diameter of 10 to 100 μm, and a thickness of 50 to 200 μm, and the second fiber web has a diameter of 0.1 to 1.0 μm. It is formed of fibers and has a pore diameter of 0.1 to 1.0 μm and a thickness of 5 to 100 μm,
A tubular filter for water treatment in which a filtration flow through which raw water passes in the thickness direction of the slitting yarn is formed, and the first fiber web having an average pore diameter larger than that of the second fiber web is disposed on the side where the raw water is introduced. delete delete According to claim 1,
A tubular filter for water treatment, characterized in that the overlapped portion of the slitting yarn is bonded through heat or ultrasonic waves, or is bonded through a separate adhesive component. delete delete According to claim 1,
The first fiber web is formed by including at least one compound selected from the group consisting of polyolyepine-based, polyvinyl-based, polystyrene-based, polyester-based, fluorine-based, polyamide-based, polysulfone-based and cellulose,
The second fiber web is any one selected from the group consisting of polyvinylidene fluoride, polyacrylonitrile, polyamide, polyurethane, polyvinyl alcohol, polyvinyl chloride, polyethersulfone (PES) and polysulfone (PS). A tubular filter for water treatment, characterized in that it is formed including the above compound. According to claim 1,
The slitting yarn is a tubular filter for water treatment, characterized in that the width is 10 ~ 50㎜. According to claim 1,
The first fiber web is a tubular filter for water treatment, characterized in that any one selected from the group consisting of a melt blown nonwoven fabric, a spunbond nonwoven fabric, a thermal bond nonwoven fabric, a chemical bond nonwoven fabric, and a Ÿ‡ laid nonwoven fabric. A filter module for water treatment having a plurality of tubular filters according to any one of claims 1, 4, and 7 to 9 arranged side by side inside the housing.

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