KR20080071015A - Asymmetric multi-layer ceramic filter, manufacturing method thereof and the water filtration system using the filter - Google Patents

Abstract

A ceramic filter is provided to improve filtration function, maintain the water purification quantity, and enable backwashing of the filter by constructing the filter in an asymmetric multi-layer structure, and further improve antibacterial function by improving the nanosilver particle coating process and additionally introducing antibacterial balls, a manufacturing method of the ceramic filter is provided, and a water purification system using the ceramic filter is provided. As a cylindrical multilayer ceramic filter, an asymmetric multi-layer ceramic filter comprises: a cylindrical ceramic supporting layer: and at least one ceramic coating layer deposited on a surface of the ceramic supporting layer, wherein an average pore size of an outer layer is 1/5 to 1/20 of that of an inner layer adjacent to the outer layer, an outermost layer has an average pore size of 40 nm to 0.2 mum, and each layer of the ceramic filter comprises nanosilver particles distributed in the entire volume of the layer. The ceramic supporting layer has an average pore size of 25 to 35 mum, and the ceramic coating layer comprises a first ceramic coating layer with an average pore size of 2 to 3 mum and a second ceramic coating layer with an average pore size of 0.1 to 0.2 mum. The asymmetric multi-layer ceramic filter further comprises a surface layer deposited on the surface of the second ceramic coating layer, the surface layer having an average pore size of 45 to 55 nm. Further, the ceramic supporting layer is formed by extrusion molding and the ceramic coating layer is formed by slip casting.

Description

Asymmetric multi-layer ceramic filter, manufacturing method, etc. and the water filtration system using the filter

FIG. 1A illustrates an example of an asymmetric multilayer ceramic filter of the present invention, and FIG. 1B illustrates a multilayer structure of an asymmetric multilayer ceramic filter according to an embodiment of the present invention.

2 to 4 are electron micrographs showing the detailed structure of an asymmetric multilayer ceramic filter according to an embodiment of the present invention.

Figure 5 shows the antimicrobial test results of the asymmetric multilayer ceramic filter according to an embodiment of the present invention.

Figure 6 is an electron micrograph comparing the ceramic coating layer of the asymmetric multilayer ceramic filter according to an embodiment of the present invention with conventional ceramic filters.

Figure 7a is a detailed structure of the conventional heavy-duty desert filter and the conventional ceramic filter Figure 7b is an electron micrograph showing the detailed structure of the asymmetric multilayer ceramic filter according to an embodiment of the present invention.

8 is a graph comparing the amount of purified water according to time of the asymmetric multilayer ceramic filter and the conventional ceramic filters according to an embodiment of the present invention.

9 is a flowchart illustrating a method of manufacturing an asymmetric multilayer ceramic filter according to an embodiment of the present invention.

10 is a view showing a water purification system using an asymmetric multilayer ceramic filter according to an embodiment of the present invention.

The present invention relates to an asymmetric multilayer ceramic filter, a method of manufacturing the same, and a water purification system using the same. Specifically, the outer layer has a smaller pore size than the inner layer, and each layer has an asymmetric multilayer ceramic filter for a water purifier, and the production thereof. Method and water purification system using the same.

The water purification method according to the conventional water purifier filter includes a hollow fiber membrane filter method, a reverse osmosis filter method, a natural load filter filtration method, an ion exchange resin filter method, and a method in which a functional filter is added. In the water purification method to which the functional filter was added, the pie ceramic filter and the silver carbon filter etc. are used.

In particular, the conventional ceramic filter has a simple structure composed of a single layer, and in particular, as a result of molding and firing of low-cost low-cost ceramic powder such as diatomaceous earth, the pore size varies from several microns to several hundred microns, resulting in uneven and coarse pores. It has a structure. Because of this, the practical filter function, of course, as the use time elapses significantly reduced, there is a problem that can not be repeatedly used because the filter material is not washed well even during backwash.

The technical problem of the present invention for solving the above-described problems of the prior art, by creating an asymmetric multilayer filter structure having a different pore size, improves the filtration function than the conventional ceramic filter, maintains the purified water even after using time and backwash It is possible to provide a new ceramic filter structure that can be used semi-permanently.

In addition, another technical problem of the present invention is to improve the method of coating the silver nanoparticles in order to increase the antibacterial function structurally and to provide an additional antibacterial ball to provide a ceramic filter with improved antibacterial function.

The asymmetric multilayer ceramic filter of the present invention for achieving the above technical problem, a cylindrical multilayer ceramic filter, a cylindrical ceramic support layer; At least one ceramic coating layer laminated on the surface of the ceramic support layer, wherein each layer of the ceramic filter has an average pore size of an outer layer of 1/5 to 1/20 of an average pore size of an adjacent inner layer, and an average pore size of an outermost layer. Is 40 nm to 0.2 µm, and each layer of the ceramic filter is characterized by containing silver nanoparticles distributed throughout its volume. That is, the present invention has such a cylindrical asymmetric multilayer filter structure, it is possible to filter impurities of various sizes for each layer as the water moves from inside the cylinder to the outside, and the effect of filtering the material by the pressure effect at the interlayer interface is increased. It also makes it possible to have an antibacterial effect by silver particles.

One example of a specific configuration of the enlarged multilayer ceramic filter of the present invention is that the ceramic support layer has an average pore size of 25 μm to 35 μm, and the ceramic coating layer has a first ceramic coating layer having an average pore size of 2 μm to 3 μm and an average. It may be made of a second ceramic coating layer having a pore size of 0.1 μm to 0.2 μm. The surface of the second ceramic coating layer may further include a stacked surface layer, and the surface layer preferably has an average pore size of 45 nm to 55 nm.

In addition, the silver nanoparticles contained in each layer of the ceramic filter of the present invention are deposited by a chemical vapor deposition method, so as to concentrate intensively at the interface between the grain boundaries and the layers surrounding the pores of each layer of the ceramic filter. . In other words, due to chemical vapor deposition, silver nanoparticles are concentrated on the interfacial grain boundaries or interfaces between the layers having a relatively high surface energy, thereby improving the antibacterial effect of raw water passing through the pores or the interfaces between the layers. do.

Moreover, it is preferable that the thickness of each layer of the ceramic filter of this invention is smaller than the thickness of the inner layer which adjoins. This is because the smaller the pore outer layer is, the slower the passage speed of the raw water, the longer the filtration time, so that the thickness is smaller than the inner layer, which is effective in terms of functions and economics.

The ceramic support layer of the ceramic filter of the present invention is formed by extrusion molding, and the ceramic coating layer is formed by slip casting. Preferably, the ceramic support layer is extrusion molded to form a support, but the ceramic coating layer is preferably an injection molding method which is advantageous for forming a uniform crystal structure and pore structure through stabilized solution of the slurry phase powder.

As a specific example, the ceramic support layer is extruded and formed by baking at 1350 ° C to 1450 ° C for 110 minutes to 130 minutes, and the first ceramic coating layer is injection molded and baked at 1300 ° C to 1350 ° C for 110 minutes to 130 minutes. And the second ceramic coating layer is injection molded and calcined at 1300 ° C to 1350 ° C for 110 minutes to 130 minutes to form the ceramic filter of the present invention.

In addition, the surface layer is injection-molded on the surface of the second ceramic coating layer, and is formed by baking at 1150 ° C to 1250 ° C for 110 minutes to 130 minutes.

It is preferable that the ceramic powder which forms each layer of the ceramic filter of this invention is an alumina powder.

In addition, the inner space of the cylinder of the ceramic filter of the present invention may be filled with antimicrobial balls having an elvan or tourmaline material, a diameter of 2 to 20 mm, and a porosity of 35% or more. Through this, the antibacterial function of the filter can be further increased.

In addition, the water purification system using the asymmetric multilayer ceramic filter of the present invention is a water purification system formed by connecting a plurality of filters, the pre-treatment filter; An asymmetric multilayer ceramic filter having at least one of the foregoing features; And a post-treatment filter, wherein the pretreatment filter, the asymmetric multilayer ceramic filter, and the post-treatment filter are sequentially connected.

In this case, the pretreatment filter is at least one of a sediment filter, a carbon filter, and a compressed carbon filter, and the post treatment filter is at least one of a carbon filter and a compressed carbon filter. The pretreatment filter removes impurities or filters chlorine, and the post-treatment filter removes unpleasant tastes, pigments, etc., which have soaked in the water, and restores clean water taste.

In addition, the purified water system of the present invention further comprises a purified water reservoir, the post-treatment filter is connected to the purified water reservoir, the purified water reservoir is made of elvan or tourmaline material, the diameter of 2 ~ 20mm, the porosity is more than 35% filled with antibacterial ball It is desirable to have. Thereby, even if the purified water stays in the purified water container for a long time, contamination of the water can be prevented.

The method for producing an asymmetric multilayer ceramic filter of the present invention comprises the steps of: (a) filling, mixing, and extruding ceramic powder to form a cylindrical ceramic support layer; And (b) filling and mixing the ceramic powder having a size of 1/5 to 1/20 of the ceramic powder than the previous step, and injection molding the surface of the inner layer to form a ceramic coating layer. Step (b) is performed at least once so that the average pore size of each layer is 40 nm to 0.2 μm.

According to a specific embodiment of the present invention, the step (a) is extrusion-molded by mixing and mixing the ceramic powder having a diameter of 25㎛ ~ 35㎛ and then fired 110 minutes to 130 minutes at 1350 ℃ ~ 1450 ℃ cylindrical ceramic Forming the support layer, (b) step (b-1) after filling and mixing the ceramic powder having a diameter of 2.5㎛ ~ 3.5㎛ by injection molding on the surface of the ceramic support layer 110 minutes ~ 130 at 1300 ℃ ~ 1350 ℃ Powder firing to form a first ceramic coating layer, and (b-2) filling and mixing a ceramic powder having a diameter of 0.25 μm to 0.35 μm, and injection molding the surface of the first ceramic coating layer to 1300 ° C. to 1350 ° C. 110 minutes to 130 minutes of baking to form a second ceramic coating layer.

In addition, after step (b-2), (b-3) filling and mixing the ceramic powder having a diameter of 50 nm to 70 nm, and injection molding the surface of the second ceramic coating layer, and then forming the powder at 110 minutes at 1150 ° C to 1250 ° C. The method may further include forming a surface layer by baking for 130 minutes.

After step (b) above, (c) AgNO ₃ The silver nanoparticles are deposited in an atmosphere, and the silver nanoparticles are deposited on each layer, further including the step of heat treatment at 600 ° C to 900 ° C. This silver nanoparticle deposition step may be performed for each layer each time to form each layer of the ceramic filter.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention in detail. The embodiments described below describe one example of embodying the technical features of the present invention, and those skilled in the art will appreciate that various modifications can be made within the scope of the technical idea of the present invention.

The ceramic filter of the present invention comprises a cylindrical ceramic support layer and at least one ceramic coating layer laminated on the surface of the ceramic support layer. That is, it has a cylindrical muti-layer structure, and each layer has an asymmetric structure with different pore sizes and thicknesses.

FIG. 1A illustrates an example of an asymmetric multilayer ceramic filter of the present invention, and FIG. 1B illustrates a multilayer structure of an asymmetric multilayer ceramic filter according to an embodiment of the present invention. 2 to 4 are electron micrographs showing the detailed structure of the asymmetric multilayer ceramic filter.

FIG. 1B shows a multilayered structure consisting of a support layer, a first coating layer, a second coating layer, and a top layer, which is a third coating layer, from the inside of the cylinder.

In the present invention, at least one ceramic coating layer (including surface layer) may be formed. Therefore, in FIG. 1B, a top layer, which is a second coating layer or a third coating layer, may be omitted, and a ceramic coating layer may be further added.

As shown in FIG. 1B, the pores in each layer have a uniform size, but the pore size between each layer becomes smaller from the support layer to the surface layer, and water is purified as it moves from inside the cylinder to outside.

Due to this asymmetrical multilayer structure, the water can be selectively filtered according to the size of the material to be filtered for each layer as the water moves from inside to outside of the cylinder, and impurities of various sizes can be filtered out. In addition, at the interface between the layers it is possible to increase the material filtration effect by the pressure effect according to the bottleneck of the fluid. That is, since the pores of the outer layer are smaller than the pores of the adjacent inner layer, a bottleneck occurs in which the passage of water suddenly narrows at the interface of each layer, and thus pressure is generated in the direction that obstructs the direction of water movement at the interface. As a result, the filtration effect of the substance can be enhanced. This is similar to the phenomenon in which fine materials adhere to and filter around sewage holes that suddenly narrow.

If the difference in pore size between each layer is too small, it is difficult to expect the above-mentioned pressure effect, and if the difference in pore size is too large, the rate of water progressing at the interface is too slow to decrease the water purification efficiency. It is preferable that the ratio of the pore size between each layer of the ceramic filter of this invention experimentally averages the pore size of the outer layer to 1/5-1/20 of the average pore size of the adjacent inner layer.

In the present invention, even if there is one or more ceramic coating layers, the average pore size of the outermost layer is preferably the smallest possible size, but is preferably about 40 nm to 0.2 μm within the limits that can be manufactured.

In the case of the 1-3 layer structure shown in FIG. 1B, the ceramic support layer has an average pore size of 25 μm to 35 μm, and the first ceramic coating layer has an average pore size of 2 μm to 3 μm, The second ceramic coating layer preferably has an average pore size of 0.1 μm to 0.2 μm, and the surface layer preferably has an average pore size of 45 nm to 55 nm.

It is preferable that the thickness of each layer of the ceramic filter of this invention is smaller than the thickness of the inner layer which adjoins. This is because the smaller the pore outer layer is, the slower the passage speed of the raw water, the longer the filtration time, so that the thickness is smaller than the inner layer, which is effective in terms of functions and economics.

Each layer of the ceramic filter of the present invention contains silver nanoparticles distributed throughout its volume. In the present invention, the silver coating method is more preferably a chemical vapor deposition method than the sputtering or ion cluster method.

In one embodiment of the present invention, silver nanoparticles are deposited by coating in a reducing atmosphere of AgNO ₃ . In this case, the silver nanoparticles are concentrated on the grain boundary surface around the pores with high surface energy or at the interface between the layers. Therefore, the coated silver nanoparticles are distributed around the pores around which the water moves or the movement speed of the water is low, so that the silver nanoparticles are concentrated on the boundary surface of each layer that can stay relatively long, thereby improving the antibacterial effect structurally.

4 is an electron micrograph showing a state in which silver nanoparticles are deposited on the ceramic coating layer of the ceramic filter of the present invention.

As shown in FIG. 4, it can be seen that the coated silver nanoparticles are concentrated in the grain boundary around the pores.

Figure 5 shows the antibacterial test results of the asymmetric multilayer ceramic filter according to an embodiment of the present invention. In the test, the ceramic filter of the present invention, in which 0.5% of the silver nanoparticles were deposited, was compared with the ceramic porous body constituting the general ceramic filter, and the cultured bacteria were Escherichia coli and Staphylococcus aureus. Experimental conditions ...

As shown in FIG. 5, it can be easily seen that the ceramic filter of the present invention, in which silver nanoparticles are deposited, is more antibacterial than the ceramic porous body.

The antibacterial effect can also be enhanced by filling the antibacterial ball in the cylindrical inner space of the ceramic filter of the present invention. The antibacterial ball of the present invention is an elvan or tourmaline (tormaline) material, the diameter is 2 ~ 20mm, the porosity is preferably 35% or more.

Hereinafter, a method of manufacturing the asymmetric multilayer ceramic filter of the present invention will be described in detail.

The method of manufacturing the asymmetric multilayer ceramic filter of the present invention comprises the steps of (a) filling and mixing the ceramic powder, extruding and calcining to form a cylindrical ceramic support layer, and (b) the ceramic powder has a size greater than that of the previous step. Filling and mixing the ceramic powder of / 5 ~ 1/120, injection molding on the surface of the inner layer and then firing to form a ceramic coating layer, so that the average pore size of the outermost layer is 40nm ~ 0.2㎛ b) performing at least one step.

In the present invention, the ceramic powder is preferably used alumina powder.

The ceramic support layer of the ceramic filter of the present invention is extruded and fired, and the ceramic coating layer is slip casted and fired. The ceramic support layer is preferably extrusion molded to form a support, but the ceramic coating layer is preferably an injection molding method which is advantageous for forming a uniform crystal structure and pore structure through stabilized peptizing of slurry phase powder.

Injection molding refers to a method of forming a slip by mixing a powder and a dispersion medium, and then molding using a capillary force (osmotic pressure) of the gypsum mold. Slurrying the ceramic powder facilitates dispersion of the powder particles, reducing convenience and non-uniformity, and is suitable for the present invention requiring uniform pore formation. In addition, the injection molding may have a more stable crystal structure upon firing because the change in particle filling (ΔPF) is smaller than that of compression molding.

9 is a flow chart of a method for manufacturing an asymmetric multilayer ceramic filter according to an embodiment of the present invention. In one embodiment of the present invention, the step of firing by extrusion molding the ceramic support layer (S110), the step of firing by injection molding the first ceramic coating layer (S130), the step of injection molding and firing the second ceramic coating layer (S150) , Injection molding the surface layer and baking (S170) and depositing and coating silver nanoparticles (S190).

According to a specific embodiment, in the step S110, after filling and mixing the ceramic powder having a diameter of 25㎛ ~ 35㎛ by extrusion molding to form a cylindrical ceramic support layer by firing 110 ~ 130 minutes at 1350 ℃ ~ 1450 ℃ do. Next, in step S130, by filling and mixing the ceramic powder having a diameter of 2.5㎛ ~ 3.5㎛ by injection molding on the surface of the ceramic support layer and then calcined 110 minutes to 130 minutes at 1300 ℃ ~ 1350 ℃ to form a first ceramic coating layer Form. Next, in the step S150, after filling and mixing the ceramic powder having a diameter of 0.25㎛ ~ 0.35㎛ injection molding on the surface of the first ceramic coating layer and then calcined 110 minutes to 130 minutes at 1300 ℃ ~ 1350 ℃ second ceramic coating layer To form. Next, in step S170, by filling and mixing the ceramic powder having a diameter of 50nm ~ 70nm and injection molding on the surface of the second ceramic coating layer and then baked at 1150 ℃ 1250 ℃ 110 minutes ~ 130 minutes to form a surface layer.

After filling the alumina powder in each step is mixed with water, it is preferable to fill at a higher density, it is also preferable to apply a vibration during the filling. After filling, the mixture is molded by mixing 40 to 50 vol% of alumina powder and 50 to 60 vol% of water. In injection molding, it is preferable to use ammonia polyacrylate or sodium citrate as a peptizing agent, and Na CMC or the like may be used as a binder.

Next, the S190 stage is AgNO ₃ The silver nanoparticles are deposited in a reducing atmosphere and heat treated at 600 ° C to 900 ° C.

In the present invention, the step of depositing and coating the silver nanoparticles is different from the above-described embodiment in each step of forming each layer of the ceramic filter AgNO ₃ Silver nanoparticles may be deposited in a reducing atmosphere and heat treated at 600 ° C to 900 ° C.

As described above, the present invention adopts a method of forming a ceramic filter in multiple layers and classifying, selecting, molding, and firing ceramic powders of a corresponding size in each step of forming each layer, so that the crystal grains and pore structure are more uniform than conventional ceramic filters. Will have

6 is an electron micrograph comparing a ceramic coating layer of an asymmetric multilayer ceramic filter according to an embodiment of the present invention with conventional ceramic filters, and FIG. 7A illustrates a detailed structure of a conventional used desert filter and a conventional ceramic filter. Electron micrograph showing the detailed structure of an asymmetric multilayer ceramic filter according to one embodiment of the invention.

As shown in Figures 6 and 7, the asymmetric multilayer ceramic filter (AML) of the present invention has a uniform crystal grain and pore structure than the ceramic wave, catadine filter or hollow fiber membrane filter, which is a kind of conventional ceramic filter. Able to know.

8 is a graph comparing the amount of purified water according to the use time of the asymmetric multilayer ceramic filter and the conventional ceramic filters according to an embodiment of the present invention.

As shown in Figure 8, it can be seen that the conventional ceramic filters (CFA, CFB, CFC) is a sharp decrease in the amount of purified water even during the 50 to 150 hours of use. However, it can be seen that the asymmetric multilayer ceramic filter (AML) of the present invention has a moderate decrease in the amount of purified water and maintains a constant level of purified water even after 1000 hours of use. As such, the ceramic filter of the present invention maintains the filter function for a long time as compared with the conventional ceramic filter, and can be used semi-permanently because back washing is possible.

Hereinafter, a water purification system using the asymmetric multilayer ceramic filter of the present invention will be described in detail.

The water purification system of the present invention comprises a plurality of filters connected to each other, and comprises a pretreatment filter, an asymmetric multilayer ceramic filter and a posttreatment filter of the present invention, and a pretreatment filter, an asymmetric multilayer ceramic filter, and a posttreatment filter are sequentially Is connected. The water purification system of the present invention forms a more complete water purification system by connecting pre / post treatment filters before and after the main filter.

In this case, the pretreatment filter is at least one of a sediment filter, a carbon filter, and a compressed carbon filter, and the post treatment filter is at least one of a carbon filter and a compressed carbon filter. The pretreatment filter removes impurities or filters chlorine, and the post-treatment filter removes unpleasant tastes, pigments, etc., which have soaked in the water, to restore clean water taste.

10 is a view showing a water purification system using an asymmetric multilayer ceramic filter according to an embodiment of the present invention. As shown in FIG. 10, the pretreatment filter connected to the asymmetric multilayer ceramic filter of the present invention is a sediment filter and a pre-carbon filter, and a post-carbon filter is connected as a post treatment filter.

In addition, the post-treatment filter is connected to a purified water reservoir (cold water tank or hot water tank), it is preferable to fill the antibacterial ball in the purified water reservoir. The antimicrobial ball of the present invention is an elvan or tourmaline material, the diameter is 2 to 20mm, the porosity is preferably 35% or more. Thereby, even if the purified water stays in the purified water container for a long time, contamination of the water can be prevented.

As described above, the optimum embodiment has been disclosed in the drawings and the specification. Although specific terms have been used herein, they are used only for the purpose of describing the present invention and are not used to limit the scope of the present invention as defined in the meaning or claims. Therefore, those skilled in the art will understand that various modifications and equivalent other embodiments are possible from this. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

According to the present invention having the characteristics as described above, by creating an asymmetric multilayer filter structure having a different pore size to improve the filtration function than the conventional ceramic filter, maintain the amount of purified water even after the use time is possible to backwash semi-permanent It is possible to provide a new ceramic filter that can be used.

In addition, it is possible to provide a ceramic filter with improved antibacterial function by improving the method of coating the silver nanoparticles so as to structurally increase the antibacterial function and by additionally introducing an antibacterial ball.

Claims (19)

Cylindrical multilayer ceramic filter, Cylindrical ceramic support layer; And At least one ceramic coating layer laminated on the surface of the ceramic support layer; Including, Each layer of the ceramic filter has an average pore size of the outer layer is 1/5 to 1/20 of the average pore size of the adjacent inner layer, the average pore size of the outermost layer is 40nm ~ 0.2㎛, Wherein each layer of the ceramic filter comprises silver nanoparticles distributed throughout its volume. The method according to claim 1, The ceramic support layer has an average pore size of 25 ㎛ ~ 35 ㎛, The ceramic coating layer is an asymmetric multilayer ceramic filter comprising a first ceramic coating layer having an average pore size of 2㎛ ~ 3㎛ and a second ceramic coating layer having an average pore size of 0.1㎛ ~ 0.2㎛. The method according to claim 2, Further comprising a surface layer laminated on the surface of the second ceramic coating layer, The surface layer is an asymmetric multilayer ceramic filter having an average pore size of 45nm ~ 55nm. The method according to claim 1, wherein the silver nanoparticles, An asymmetric multilayer ceramic filter that is chemically deposited in a reducing atmosphere and is concentrated at the interface between each layer and the grain boundaries surrounding the pores of each layer of the ceramic filter. The method of claim 1, wherein each layer of the ceramic filter, Asymmetric multilayer ceramic filter, the thickness of the outer layer is smaller than the thickness of the adjacent inner layer. The method according to claim 1, Wherein said ceramic support layer is formed by extrusion molding and said ceramic coating layer is formed by slip casting. The method according to claim 2, The ceramic support layer is formed by extrusion molding, firing 110 minutes to 130 minutes at 1350 ℃ ~ 1450 ℃, The first ceramic coating layer is injection molded, and is formed by firing at 110 minutes to 130 minutes at 1300 ℃ ~ 1350 ℃, The second ceramic coating layer is injection-molded, asymmetric multilayer ceramic filter is formed by firing 110 ~ 130 minutes at 1300 ℃ ~ 1350 ℃. The method according to claim 3, wherein the surface layer, An asymmetric multilayer ceramic filter formed by injection molding on the surface of the second ceramic coating layer and firing for 110 minutes to 130 minutes at 1150 ° C to 1250 ° C. The method according to claim 1, An asymmetric multilayer ceramic filter, wherein the ceramic powder forming each layer of the ceramic filter is alumina powder. The method according to claim 1, An asymmetric multilayer ceramic filter filled with antimicrobial balls in a cylindrical inner space of the ceramic filter, which is made of elvan or tourmaline, having a diameter of 2 to 20 mm, and a porosity of 35% or more. A water purification system in which a plurality of filters are connected, Pretreatment filter; The asymmetric multilayer ceramic filter of claim 1; And Post treatment filter; Including, And the pretreatment filter, the asymmetric multilayer ceramic filter, and the post treatment filter are sequentially connected. The method according to claim 11, The pretreatment filter is at least one of a sediment filter, a carbon filter, a compressed carbon filter, The aftertreatment filter is at least one of a carbon filter and a compressed carbon filter. The method according to claim 11, wherein the water purification system, Further includes an integer reservoir, The purified water reservoir is connected to the post-treatment filter, the interior of the water purification system is filled with antimicrobial ball of elvan or tourmaline material, the diameter of 2 ~ 20mm, porosity of more than 35%. As a method of manufacturing an asymmetric multilayer ceramic filter, (a) filling and mixing the ceramic powder, extruding and calcining to form a cylindrical ceramic support layer; (b) filling and mixing the ceramic powder having a size of 1/5 to 1/20 than that of the previous step, injection molding the surface of the inner layer, and then firing to form a ceramic coating layer; Including; A method of producing an asymmetric multilayer ceramic filter, in which step (b) is performed at least once so that the average pore size of the outermost layer is 40 nm to 0.2 μm. The method according to claim 14, In step (a), After filling and mixing the ceramic powder having a diameter of 25 μm to 35 μm and extruding it, it was calcined at 1350 ° C. to 1450 ° C. for 110 minutes to 130 minutes to form a cylindrical ceramic support layer. In step (b), (b-1) filling and mixing a ceramic powder having a diameter of 2.5 μm to 3.5 μm, injection molding the surface of the ceramic support layer, and baking the same at 1300 ° C. to 1350 ° C. for 110 minutes to 130 minutes to form a first ceramic coating layer. Steps and, (b-2) filling and mixing the ceramic powder having a diameter of 0.25 µm to 0.35 µm, injection molding the surface of the first ceramic coating layer, and then calcining at 1300 ° C to 1350 ° C for 110 minutes to 130 minutes to form a second ceramic coating layer. A method for producing an asymmetric multilayer ceramic filter comprising the step of forming. The method according to claim 15, after the step (b-2), (b-3) filling and mixing the ceramic powder having a diameter of 50 nm to 70 nm, injection molding the surface of the second ceramic coating layer, and baking the same at 110 to 130 minutes at 1150 ° C. to 1250 ° C. to form a surface layer; Method of producing an asymmetric multilayer ceramic filter further comprising. The method according to claim 14, after the step (b), (c) AgNO ₃ Depositing silver nanoparticles in a reducing atmosphere and performing heat treatment at 600 ° C to 900 ° C; Method for producing an asymmetric multilayer ceramic filter further comprising. The method according to claim 14, After forming each layer of the ceramic filter, (c) AgNO ₃ Depositing silver nanoparticles in a reducing atmosphere and performing heat treatment at 600 ° C to 900 ° C; Asymmetric multilayer ceramic filter manufacturing method for performing each. The method according to claim 14, The ceramic powder is asymmetric multilayer ceramic filter manufacturing method consisting of alumina.

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