JP2000342917A - Filter and water purifier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve an increase in filtering flow rate, the extension of life and the enhancement of filtering efficiency, in a filter having a laminate consisting of three or more porous adsorbing material layers, by making the average pore size of each of the porous adsorbing material layers smaller than that of the porous adsorbing material layer adjacent on the side of a liquid to be filtered. SOLUTION: In a water purifier 1 wherein a columnar block-shaped filter 10 having a hollow part 11 at its center is housed in a cylindrical container 2, the filter 10 comprises a porous molded body wherein three porous adsorbing material layers are laminated and the porous molded body is constituted of an inner layer 12, an intermediate layer 13 and an outer layer 14 all of which different in average pore size from each other. At this time, the average pore size of the inner, intermediate and outer layers 12, 13, 14 is made smaller than that of the porous adsorbing material layer adjacent on the side of a liquid to be filtered. That is, the average pore size of the intermediate layer is made smaller than that of the outer layer 14 and the average pore size of the inner layer 12 is made smaller than that of the intermediate layer 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter and a water purifier for purifying supplied tap water and the like, and more particularly to a filter and a water purifier having a long filter life and a large filtration flow rate.

[0002]

2. Description of the Related Art Water purifiers are widely used for the purpose of removing residual chlorine, trihalomethane, minute substances, germs and odors contained in tap water. As such a water purifier, for example, a water purifier as shown in FIG. 7 is known.

[0003] This water purifier 51 comprises a cylindrical container 52,
A cylindrical block-shaped filtration filter 60 having a hollow portion 61 at the center housed in the container 52, a lid 53 detachably provided on the upper surface of the container 52, and a container 52 inside the outer peripheral wall of the container 52. And a purified water intake section 55 provided in the lid 53 in communication with the hollow section 61 of the filtration filter 60.

The outer peripheral wall surface of the filtration filter 60 is covered with a nonwoven fabric 65 for protecting the filtration filter 60 and a net 66 for holding the same.
Of the filter 61 is covered with a porous plastic tube 67 for preventing the separated activated carbon from flowing out.
Protected.

[0005] The filtration filter 60 is made of activated carbon powder.
It is a porous molded body formed by binding the granules with a binder such as a carboxymethylcellulose-based binder, a clay mineral-based (bentonite-based, kaolin-based, or staple guide-based) or polyethylene. While the raw water supplied to the water purifier 51 passes from the outer peripheral wall side of the filtration filter 60 to the hollow portion 61, the fine substances and the like in the raw water are reduced by the fine pores formed between the activated carbon particles bound by the binder. The trapped and residual chlorine and the like in the raw water are adsorbed and removed by the activated carbon.

However, this filter 60 is
There is a problem that the fine substance or the like trapped in the micropores near the outer peripheral wall side surface causes clogging immediately after the start of use, thereby reducing the filtration flow rate and shortening the life of the filtration filter 60. As a filter for solving the problem of clogging due to such a minute substance, a filter as shown in FIG.
A filtration filter comprising a porous molded body having a layer structure is disclosed in U.S. Pat. No. 4,753,728.

[0007] The filter 70 is 80 to 400 A
An inner layer 72 formed by binding activated carbon of STM mesh (180 to 38 μm) with a binder, and an outer layer 73 formed by binding activated carbon of 20 to 80 ASTM mesh (850 to 180 μm) with a binder. It is a cylindrical block having a portion 71. The outer peripheral wall surface of the filtration filter 70 is covered with a nonwoven fabric 75 for protecting the filtration filter 70 and a net 76 for holding the same. Porous plastic tube 7 to prevent outflow
7, and the top and bottom surfaces of the filter 70 are protected by caps 78 and 79.

The filter 70 comprises an inner layer 72 having relatively fine pores and an outer layer 73 having relatively fine pores, so that the outer layer 73 functions as a pre-filter. And clogging due to minute substances or the like can be reduced.

[0009]

The filtration filter 70 having such a two-layer structure has an improved filtration flow rate and a longer service life than the filtration filter 60 having a single-layer structure. However, relatively small micromaterials cannot be sufficiently captured in the outer layer 73 and cause clogging in the inner layer 72. Therefore, the effect of improving the filtration flow rate and the life of the filtration filter is still insufficient, and a filtration filter that is less likely to be clogged has been desired.

[0010] Accordingly, an object of the present invention is to provide a filtration filter capable of achieving an increase in filtration flow rate, a longer life, and an improvement in filtration efficiency, and a water purifier using the same.

[0011]

That is, in the filter of the present invention, the porous adsorbent layer formed by molding the adsorbent has three layers.
A filtration filter having a laminate in which at least two layers are stacked, wherein the average pore size of each porous adsorbent layer is smaller than the average pore size of the porous adsorbent layer adjacent to the liquid to be filtered. Further, it is preferable that the porous adsorbent layers are stacked concentrically.

Further, the porous adsorbent layer may be a porous formed body formed by binding powder of the adsorbent with a binder. Preferably, the adsorbent is activated carbon. Further, the adsorbent may be a nonwoven fabric of fibrous activated carbon. Further, it is preferable that silver is attached and / or mixed to the porous adsorbent layer, because propagation of various bacteria can be prevented. Preferably, the binder is ultra-high molecular weight polyethylene.
And a water purifier of the present invention is provided with the above-mentioned filtration filter.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a filter and a water purifier according to the present invention will be described with reference to the drawings. (Embodiment 1) FIG. 1 is a side sectional view showing an embodiment of a water purifier of the present invention, and FIG. 2 is a perspective sectional view showing a filtration filter used in the water purifier. This water purifier 1
Is a cylindrical block-shaped filter filter 1 having a hollow portion 11 at the center and housed in the container 2.
0, a lid 3 for sealing the upper surface of the container 2, a raw water inlet 4 provided at the lower part of the outer peripheral wall of the container 2 in communication with the inside of the container 2, and a hollow 11 of the filtration filter 10. And a clean water intake section 5 provided on the lid 3.

The filtration filter 10 comprises a powder of an adsorbent,
3 formed by binding granules and the like with a binder
A porous molded body in which two porous adsorbent layers are laminated,
This porous molded body has an inner layer 1 having a different average pore diameter.
2, an intermediate layer 13 and an outer layer 14. The outer peripheral wall surface of the filtration filter 10 is covered with a nonwoven fabric 15 for protecting the filtration filter 10 and a net 16 for holding the same. It is covered with a porous plastic tube 17 for preventing outflow, and the top and bottom surfaces of the filter 10 are protected by caps 18 and 19.

The inner layer 1 constituting the filtration filter 10
2. The average pore diameter of the intermediate layer 13 and the outer layer 14 needs to be smaller than the average pore diameter of the porous adsorbent layer adjacent to the liquid to be filtered. That is, the average pore size of the intermediate layer 13 is made smaller than the average pore size of the outer layer 14,
Is required to be smaller than the average pore size of the intermediate layer 13. Conversely, when the average pore size of each porous adsorbent layer is larger than the average pore size of the porous adsorbent layer adjacent to the liquid to be filtered, for example, the inner layer 12
When the average pore diameter of the intermediate layer 13 is larger than the average pore diameter of the outer layer 14,
Alternatively, the fine substance or the like is clogged in the fine pores of the intermediate layer 13, and it is difficult to achieve the object of the present invention.

The average pore size of each porous adsorbent layer is not particularly limited as long as it is reduced in the order of the outer layer 14, the intermediate layer 13, and the inner layer 12, but is preferably in the range of 0.05 to 50 μm. Is preferably, more preferably 0.1 to 10 μm
m. If the average pore diameter is less than 0.05 μm, clogging with minute substances or the like is likely to occur, and the filtration flow rate may be extremely reduced. On the other hand, when the average pore size is 5
If it exceeds 0 μm, it may be difficult to capture minute substances and the like.

More specifically, the average pore size of the outer layer 14 is
It is preferably in the range of 1 to 50 μm, more preferably in the range of 1 to 10 μm. The average pore size of the intermediate layer 13 is preferably in the range of 0.5 to 10 μm, and more preferably in the range of 0.5 to 5 μm. The average pore size of the inner layer 12 is preferably in the range of 0.05 to 2 μm, and more preferably in the range of 0.1 to 1 μm.

The thickness of each porous adsorbent layer is appropriately selected depending on the size of the filtration filter 10, required filtration performance, and the like, and is not particularly limited. Also, the ratio of the thickness of each porous adsorbent layer is appropriately selected depending on the required initial flow rate, set operating pressure, substance to be filtered, filtration performance, filtration capacity, used water quality, installation location, application, size, etc. And there is no particular limitation. Taste and smell such as residual chlorine and mold smell in filtrate, organic chemicals such as trihalomethane, volatile compounds, herbicides, insecticides, dioxins, inorganic chemicals such as lead, mercury, radon, and red rust scale When it is important to remove minute substances such as precipitates, asbestos, giardia cysts, cryptosporidium oocysts, bacteria, etc., the inner layer 12 is replaced with the outer layer 14.
The thickness of the outer layer 14 and the intermediate layer 13 may be made larger than that of the inner layer 12 when importance is placed on prevention of clogging of the filtration filter 10. However,
When it is desired to set a large initial flow rate, the fine inner layer may be thinned.

Examples of the adsorbent include a powdery adsorbent, a granular adsorbent obtained by granulating the powdery adsorbent, and a fibrous adsorbent. Examples of such adsorbents include natural adsorbents (natural zeolite, silver zeolite, acid clay, etc.), synthetic adsorbents (synthetic zeolite, antibacterial zeolite, bacterial adsorption polymer, phosphate rock, molecular sieve, Inorganic adsorbents such as silica gel, silica-alumina gel adsorbent, and porous glass); powdered activated carbon, fibrous activated carbon, block activated carbon, extruded activated carbon, molded activated carbon, molecular adsorption resin, synthetic granular activated carbon, synthetic Known fibrous activated carbon, ion-exchange resin, ion-exchange fiber, chelate resin, chelate fiber, highly water-absorbent resin, highly water-absorbent fiber, oil-absorbent resin, and organic adsorbents such as oil-absorbing agents. . Among them, activated carbon excellent in adsorptivity of organic compounds such as residual chlorine, moldy odor, and trihalomethane in raw water is preferably used. Among activated carbons, fibrous activated carbon is preferably used because of its large contact area with the liquid to be filtered, high adsorptivity and high water permeability.

Examples of the activated carbon include plant material (wood, cellulose, sawdust, charcoal, coconut shell charcoal, ash, etc.), coal (peat, lignite, lignite, bituminous coal, anthracite, tar, etc.), and petroleum (oil) Residue, sulfuric acid sludge, oil carbon, etc.), pulp waste liquid, synthetic resin, etc. are carbonized, and gas activation (steam, carbon dioxide, air, etc.) and chemical activation (calcium chloride, magnesium chloride, zinc chloride, phosphoric acid) as necessary , Sulfuric acid, caustic soda, KOH, etc.). Examples of the fibrous activated carbon include those obtained by carbonizing and activating a precursor made of polyacrylonitrile (PAN), cellulose, phenol, or coal-based pitch.

When the adsorbent is composed of powder or granules, its average particle size is appropriately selected depending on the intended (average) pore size of the porous molded body, and is not particularly limited.
m or less. Average particle size 150
If it exceeds μm, the average pore diameter of the formed fine pores becomes too large, and it may be difficult to capture fine substances and the like.

It is preferable that the porous molded body is formed by bonding adsorbent powder with a binder in consideration of strength, handleability and the like. As the binder,
As long as the adsorbents can be bonded to each other to form micropores between the adsorbents and the binder, there is no particular limitation. For example, polyolefins such as polyethylene and polypropylene, carboxymethylcellulose-based, clay mineral-based ( Bentonite, Kaolin, Attaple guide, etc.)
And the like. Among them, ultrahigh molecular weight polyethylene is preferably used in terms of optimization of the surface area of the adsorbent, food hygiene and thermal stability. Specifically, the average molecular weight is 3,000,
Ultrahigh molecular weight polyethylene of 000 to 6,000,000 g / mol is suitable.

In order to bond the adsorbents to each other and form micropores between the adsorbents and the binder, the shape of the binder is preferably powder or granules. When the binder is composed of powder or granules, the average particle size is appropriately selected depending on the intended average pore size of the porous molded body, and is not particularly limited, but is preferably in the range of 5 to 2,000 μm. , More preferably in the range of 20 to 300 μm. If the average particle diameter is less than 5 μm, the average pore diameter of the formed fine pores becomes too small, so that clogging with fine substances or the like is likely to occur, and the filtration flow rate may be extremely reduced. On the other hand, when the average particle diameter exceeds 2,000 μm, the average pore diameter of the formed fine pores becomes too large, and it may be difficult to capture fine substances and the like.

The amount of the binder is not particularly limited, but is suitably from 10 to 40% by weight based on the weight of the adsorbent. If the blending amount of the binder with respect to the adsorbent is less than 10% by weight, the bonding between the adsorbents may be insufficient, and if it exceeds 40% by weight, the filtration performance of the filtration filter 10 decreases,
Further, there is a possibility that the micropores of the filtration filter 10 may be closed.

Next, the filtration filter 10 according to this embodiment will be described.
A method of manufacturing the device will be described. First, as shown in FIG. 3, a cylindrical partition plate 22 and a partition plate 23 are concentrically placed in a bottomed cylindrical mold 20 provided with a cylindrical tube 21 for forming the hollow portion 11 at the center. Arrange. Then, cylindrical tube 2
1 and the partition plate 22 are filled with a mixture of the adsorbent and the binder for the inner layer 12, and between the partition plate 22 and the partition plate 23,
The mixture of the adsorbent and the binder for the intermediate layer 13 is filled, and the mixture of the adsorbent and the binder for the outer layer 14 is filled between the partition plate 23 and the peripheral wall of the mold 21. After filling the mixture of the activated carbon and the binder, the partition plate 22 and the partition plate 23 are removed, and the mixture of the activated carbon and the binder is pressurized and heated to obtain the filtration filter 10 on which the porous adsorbent layer is laminated.

The heating temperature at the time of manufacturing the filter 10 is appropriately selected depending on the binder used, and is not particularly limited.
70-260 ° C. The heating time is about 5 minutes to 5 hours when using ultra-high-molecular-weight polyethylene. The pressure at the time of producing the porous molded body is also not particularly limited, but is usually 20 to 150 p. s. As for i, there is a method in which pressure is not applied at all.

When a fibrous activated carbon nonwoven fabric is used as an adsorbent, a binder is used by winding three types of fibrous activated carbon nonwoven fabrics having different meshes on a plastic pipe 17 in ascending order of mesh size. Without this, the filter can be easily manufactured.

Next, a method for producing purified water using the water purifier 1 of this embodiment will be described. Raw water (filtration liquid) containing residual chlorine supplied from a water tap or the like is introduced into the container 2 from the raw water inlet 4 through a water supply pipe (not shown). Next, the raw water passes through the outer layer 14, the intermediate layer 13, and the inner layer 12 in order from the outer peripheral wall side of the filtration filter 10 and is discharged to the hollow portion 11. The taste and smell of residual chlorine and mold smell in raw water, organic chemicals such as trihalomethane, volatile compounds, herbicides, insecticides, dioxins, inorganic chemicals such as lead, mercury, radon, and red rust.・ Pure water (filtrate) discharged after removing fine substances such as scales, sediments, asbestos and other turbid substances, giardia cysts, cryptosporidium oocysts and bacteria, etc., is discharged through the hollow portion 11 and the purified water intake section. 5 is discharged to the outside of the water purifier 1.

In such a filter 10,
In the outer layer 14, relatively large minute substances and the like in the raw water are captured, so that clogging in the intermediate layer 13 and the inner layer 12 can be reduced. In addition, since relatively small minute substances and the like in the raw water are captured in the intermediate layer 13, clogging in the inner layer 12 can be further reduced. Here, since the average pore diameter of the fine pores of the outer layer 14 and the intermediate layer 13 is larger than that of the inner layer 12, fine substances and the like captured by the outer layer 14 and the
4 and the micropores of the intermediate layer 13 are not completely closed. In addition, since the filtration flow rate is larger than that of a single-layer filtration filter, the filtration efficiency is also improved. In addition, the shape of the filtration filter 10 is cylindrical, and the porous adsorbent layers are laminated concentrically to form the filtration filter 10.
Since the surface area on the side of the liquid to be filtered increases, the filtration flow rate can be increased.

The filtration filter in the illustrated example has an outer layer 1
4, three-layer structure of intermediate layer 13 and inner layer 12,
The filtration filter of the present invention is not limited to this, and may be a filtration filter having a structure of four or more layers. By increasing the number of porous adsorbent layers in the filter, it is possible to further suppress clogging due to minute substances and the like. Further, in the filtration filter of the present invention, for example, a cap in the shape of the lid 3 is provided instead of the cap 18, and a cap having a shape without a hole in the center is provided as the cap 19. It may be a form integrated with the filtration filter by adhesion. By doing so, it can be applied to a small water purifier directly connected to a faucet. Further, the water purifier of the present invention is not limited to the water purifier 1 in the illustrated example. For example, as shown in FIG. 4, a water purifier 25 provided at the bottom of the container 2 by connecting the purified water outlet 5 to the hollow portion of the filtration filter 10 and the like can be mentioned.

(Embodiment 2) FIG. 5 is a side sectional view showing an embodiment of the water purifier of the present invention. The water purifier 30 includes a cylindrical container 32, a filtration cartridge 40 stored in the container 32, a lid 33 detachably provided on an upper surface of the container 32, and a container It comprises a raw water inlet 34 provided in communication with the inside of the filter 32 and a purified water intake 35 provided in the lid 33 in communication with the inside of the filtration cartridge 40.

The filtration cartridge 40 includes a cylindrical container 41, a cylindrical block-shaped filtration filter 42 accommodated in the container 41, a porous plastic plate 43 provided on the bottom surface of the container 41, It comprises a non-woven fabric 44 covering the upper surface of the filter 42 and a cap 45 provided on the upper surface of the container 41 and having a water outlet 46 connected to the purified water intake 35.

The filtration filter 42 is a porous formed body in which three porous adsorbent layers formed by binding adsorbent powder or the like with a binder are laminated. It comprises a lower layer 47, an intermediate layer 48 and an upper layer 49 having different average pore diameters.

The lower layer 4 constituting the filtration filter 42
7. The average pore diameter of the intermediate layer 48 and the upper layer 49 is as follows.
Similarly to the above, each of the porous adsorbent layers adjacent to the liquid to be filtered needs to be smaller than the average pore diameter. That is, the average pore size of the intermediate layer 48 needs to be smaller than the average pore size of the lower layer 47, and the average pore size of the upper layer 49 needs to be smaller than the average pore size of the intermediate layer 48.

The average pore diameter of each porous adsorbent layer is not particularly limited as long as it is reduced in the order of the lower layer 47, the intermediate layer 48, and the upper layer 49, as in the first embodiment.
It is preferably in the range of 5 to 50 μm, more preferably in the range of 0.1 to 10 μm. In addition, the same adsorbent, binder, and the like used in the filtration filter 42 according to the present embodiment can be the same as those used in the first embodiment.

Next, the filter 40 of the present embodiment will be described.
A method of manufacturing the device will be described. First, the mixture of the adsorbent and the binder for the lower layer 47, the mixture of the adsorbent and the binder for the intermediate layer 48, and the mixture of the adsorbent and the binder for the upper layer 49 are placed in a cylindrical mold having a bottom. Fill sequentially. Next, the mixture of the activated carbon and the binder is pressurized and heated to obtain a filtration filter 42 composed of a porous formed body on which a porous adsorbent layer is laminated.

In such a filter 42,
In the lower layer 47, relatively large minute substances and the like in the raw water are captured, so that clogging in the intermediate layer 48 and the upper layer 49 can be reduced. In addition, since relatively small minute substances and the like in the raw water are captured in the intermediate layer 48, clogging in the upper layer 49 can be further reduced. Here, since the average pore diameter of the micropores of the lower layer 47 and the intermediate layer 48 is larger than that of the upper layer 49, the fine substance and the like captured by the lower layer 47 and the
9 and the intermediate layer 48 are not completely closed. In addition, since the filtration flow rate is larger than that of a single-layer filtration filter, the filtration efficiency is also improved.

Although the filtration filter 42 in the illustrated example has a three-layer structure of a lower layer 47, an intermediate layer 48, and an upper layer 49, the filtration filter of the present invention is not limited to this, and has four or more layers. It may be a filtration filter having the structure of By increasing the number of porous adsorbent layers in the filter, it is possible to further suppress clogging due to minute substances and the like.

As shown in FIG. 6, a hollow fiber membrane element 50 in which a plurality of hollow fiber membranes 51 bent in a U-shape are fixed with a fixing resin 52 while the open state of both ends is maintained, You may use the water purifier 31 attached downstream from the filtration filter 42. By using such a hollow fiber membrane element 50 in combination, it becomes possible to remove minute substances such as bacteria that could not be captured by the filtration filter 42. It is also possible to increase the average flow rate of the fine pores of the filtration filter 42 to increase the filtration flow rate.

[0040]

As described above, the filtration filter of the present invention is a filtration filter having a laminate in which three or more porous adsorbent layers formed by molding an adsorbent are laminated. Since the average pore size of the adsorbent layer is smaller than the average pore size of the porous adsorbent layer adjacent to the liquid to be filtered,
The filtration flow rate can be increased, the life of the filtration filter can be extended, and the filtration efficiency can be improved. Further, when the porous adsorbent layers are stacked concentrically, the flow rate of filtration through the filtration filter can be further increased.

Further, if the porous adsorbent layer is a porous formed body formed by binding adsorbent powder with a binder, the strength of the filtration filter can be increased. Further, by using activated carbon as the adsorbent, the dechlorination ability of the filter can be improved. Further, by using a fibrous activated carbon nonwoven fabric as the adsorbent, it is possible to obtain a filtration filter which has a large contact area with the liquid to be filtered, has high adsorbability and water permeability, is lightweight, and is easy to manufacture. In addition, when silver is attached to and / or mixed with the porous adsorbent layer, propagation of various bacteria and the like can be prevented. When the binder is ultrahigh molecular weight polyethylene, it is possible to obtain a filtration filter having an optimized adsorbent surface area, excellent food hygiene, and excellent heat stability. Since the water purifier of the present invention includes the filtration filter, the water purification device has a large filtration flow rate, a long life of the filtration filter, and excellent filtration efficiency.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing an example of a water purifier of the present invention.

FIG. 2 is a perspective sectional view showing an example of a filtration filter of the present invention.

FIG. 3 is a perspective sectional view showing an example of a mold used for manufacturing the filtration filter of the present invention.

FIG. 4 is a side sectional view showing another example of the water purifier of the present invention.

FIG. 5 is a side sectional view showing another example of the water purifier of the present invention.

FIG. 6 is a side sectional view showing another example of the water purifier of the present invention.

FIG. 7 is a side sectional view showing an example of a conventional water purifier.

FIG. 8 is a perspective sectional view showing an example of a conventional filtration filter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Water purifier 10 Filtration filter 12 Inner layer (porous adsorbent layer) 13 Intermediate layer (porous adsorbent layer) 14 Outer layer (porous adsorbent layer) 25 Water purifier 30 Water purifier 31 Water purifier 42 Filtration filter 47 Lower layer (Porous) Adsorbent layer) 48 Intermediate layer (porous adsorbent layer) 49 Upper layer (porous adsorbent layer)

Continued on the front page F-term (reference) 4D019 AA03 BA03 BA13 BA17 BB03 BB10 BB12 BB18 BC05 BC06 BD01 BD02 CA03 CB01 CB03 CB04 4D024 AA02 AB02 AB07 AB11 BA02 BB03 BB05 CA11 DB27 4G066 AA02B AA05 CA31 BA47 FA25

Claims (8)

[Claims] 1. A filtration filter having a laminate in which three or more porous adsorbent layers formed by forming an adsorbent are laminated, wherein the average pore size of each porous adsorbent layer is closer to the liquid to be filtered. A filtration filter characterized by being smaller than the average pore diameter of an adjacent porous adsorbent layer. 2. The filter according to claim 1, wherein the porous adsorbent layers are stacked concentrically. 3. The porous adsorbent layer according to claim 1, wherein the porous adsorbent layer is a porous formed body formed by binding powder and / or granular material of the adsorbent with a binder. Item 3. A filtration filter according to Item 2. 4. The filter according to claim 1, wherein the adsorbent is activated carbon. 5. The filter according to claim 1, wherein the adsorbent is a nonwoven fabric of fibrous activated carbon. 6. The filter according to claim 1, wherein silver is attached to and / or mixed with the porous adsorbent layer. 7. The filter according to claim 3, wherein the binder is ultra-high molecular weight polyethylene. 8. A water purifier comprising the filtration filter according to any one of claims 1 to 7.