KR20170112589A - Catridge filter of multilayer type and directly water purifier comprising the same - Google Patents

Abstract

The present invention relates to a multi-layer type cartridge filter and a water purifier including the same, and more particularly, to a multi-layer type cartridge filter having an excellent organic chemical and chlorine removal rate, an excellent microbial removal rate, And a water purifier.

Description

[0001] The present invention relates to a multi-layer type cartridge filter and a water purifier including the multi-

The present invention relates to a multi-layer type cartridge filter and a water purifier including the same, and more particularly, to a multi-layer type cartridge filter having an excellent organic chemical and chlorine removal rate, an excellent microbial removal rate, And a water purifier.

Environmental problems are becoming a serious problem due to industrial development. In particular, various technologies are being studied on the recycling of wastewater used in the whole industry, the pretreatment of industrial water, the pretreatment of drinking water for household use, and the chemical treatment process.

Generally, there are many ionic substances and chemical substances in water, including Natural Organic matter (NOM), and it is not removed in the process of water treatment but acts as a cause of generating new pollutants. In addition, the presence of pathogenic microorganisms, which have not been removed by chlorine disinfection, has recently been controversial.

The pathogenic microorganisms are classified into viruses, cryptosporidium, and Giardia. These pathogenic microorganisms are released into the environment through human and animal feces and are present in not only sewage but also surface water and groundwater. The virus has a very small size with a size of 0.02 ~ 0.09 ㎛, an average length of 0.4 ~ 14 ㎛ and a width of 0.2 ~ 1.2 ㎛. It is hardly treated by general filtration and forms a strong resistant cyst, Has been stable for several months.

At present, as a method for removing trace contaminants in the water, highly flocculation treatment, activated carbon adsorption, microfiber filter, membrane filtration are performed in a water treatment process. In recent years, a large-scale national research on water treatment processes using membranes has been carried out and commercialization in advanced water treatment processes has been on the agenda. However, it is still not widely used due to economical costs and technical problems.

Membrane filtration is mainly composed of RO (reverse osmosis membrane), NF membrane, UF membrane, and MF membrane. The membrane filtration is based on the pore diameter and pore size. To remove contaminants from the water. Specifically, the main mechanism for removing contaminants from the membrane filtration is to remove bacteria, viruses, organic contaminants, etc. suspended in water by applying a sieve effect, that is, removal by particle size. Also, microorganisms and the like are filtered by electrostatic adsorption according to the surface charge of the membrane. This method is attracting attention because of its high permeability and high particle removal performance compared to a low operating pressure. However, the membrane filtration has a problem that the filtration efficiency is good but the pressure loss is large.

In addition, although the microfibre filter is widely used for water treatment, it has a disadvantage in that the filtration area is narrow and the efficiency is low because there is no electrostatic force. Therefore, studies have been conducted to increase the filtration efficiency of the fiber filter and decrease the pressure loss by applying an electrostatic force to the microfiber filter having micro-sized pore diameters to overcome the disadvantages of the microfiber filter and the membrane filtration.

For example, U.S. Patent No. 7,601,262 discloses a method for manufacturing antiviral nonwoven fabrics by using glass fiber as a basic filter material and by adding inorganic compounds having a positive charge at the time of glass fiber production to prepare a positive charge filter, And adsorbing and removing the adsorbent. However, since the above-mentioned technology uses glass fiber, there is a problem of the suitability of the water treatment process and the limitation of the applied product group due to the controversy of harmfulness such as carcinogenesis, the organic chemical and chlorine removal rate is excellent, the microbial removal rate is excellent, There is a problem that it is difficult to show the effect.

US 7601262 B1 (Registered on October 13, 2009)

It is an object of the present invention to provide a multi-layer type cartridge filter having an excellent organic chemical and chlorine removal rate, an excellent microbial removal rate, Water purifier.

In order to solve the above-mentioned problems, the present invention provides a method of manufacturing a microporous membrane, comprising a free carbon filtration layer for removing VOC and chlorine, a positive charge filtration layer formed along an inner circumferential surface of the free carbon filtration layer for removing negative charge microorganisms and heavy metals, And a post-carbon filtration layer formed along the inner circumferential surface of the hollow cylindrical filter and containing a hollow therein and removing residual VOC and chlorine.

According to another preferred embodiment of the present invention, the cedilla filter layer may be formed along the outer circumferential surface of the free carbon filtration layer to remove the particulate matter of the raw water, and the cedilla filtration layer may have an average particle size of 5 μm Woven fabric having a phosphorus removal rate of 90% or more.

According to another preferred embodiment of the present invention, the positive charge filtration layer may be one selected from a depth type positive charge filtration layer and a bending type positive charge filtration layer.

According to another preferred embodiment of the present invention, the free carbon filter layer may include a nonwoven fabric having an average particle diameter of 3 μm and a particle removal ratio of 90% or more, and the post-carbon filter layer may have a particle removal rate of 1 μm 90% or more activated carbon.

According to another preferred embodiment of the present invention, the positively charged layer may have a zeta value of 5 to 50 mV.

According to another preferred embodiment of the present invention, the depth type positive charge filtration layer may include two or more positive charge nonwoven fabrics provided to surround the outer surface of the post carbon layer.

According to another preferred embodiment of the present invention, the bending type positive charge filtration layer may include a filter portion having a bent cross section and surrounding the outer circumferential surface of the post-carbon filtration layer.

According to another preferred embodiment of the present invention, the filter unit may include a first nonwoven fabric containing at least one selected from polypropylene fiber, polyethylene terephthalate fiber, polyethylene fiber, polyester fiber, nylon fiber and cellulose fiber, A spunbond layer overlapping both surfaces of the nonwoven fabric, and a positive charge coating layer formed on the surface of the fiber strands contained in the nonwoven fabric and on the surface thereof.

According to another preferred embodiment of the present invention, the filter portion includes a first bent portion bent in the outward direction of the post carbon filtration layer and a second bent portion bent inward in the post carbon filtration layer And the first bent portion and the second bent portion may be alternately repeatedly formed.

According to another preferred embodiment of the present invention, the first nonwoven fabric may further include a second nonwoven fabric and a membrane overlapping one surface of the first nonwoven fabric.

According to another preferred embodiment of the present invention, the membrane may be a polysulfone-based membrane having a pore size of 0.1 to 0.6 탆.

According to another preferred embodiment of the present invention, the cedilla filtration layer has a thickness of 0 to 4 mm, the free carbon filtration layer has a thickness of 8 to 18 mm, the positive charge filtration layer has a thickness of 10 to 14 mm, The layer may have a thickness of 3 to 9 mm.

According to another preferred embodiment of the present invention, the free carbon filtration layer may be thicker than the post carbon filtration layer.

According to another preferred embodiment of the present invention, the hollow may have a diameter of 8 to 15 mm.

According to another preferred embodiment of the present invention, the raw water may be introduced from the outside of the sedimentary layer, filtered, and then discharged through the hollow.

According to another preferred embodiment of the present invention, the multi-layer type cartridge filter may have a chlorine removal capability of 5,900 L or more as measured by the following measurement method 1.

[Measurement method 1]

The solution dropped to distilled water to a concentration of 2 mg / L of hypochlorous acid (HClO) was flowed into the cartridge at a flow rate of 2 LPM, and the chlorine concentration was analyzed by ion chromatography on the influent and permeated water. At this time, the flow rate passed through until the chlorine removal efficiency of less than 90% was indicated by the chlorine removal ability.

According to another preferred embodiment of the present invention, the multilayered cartridge filter may have a particle removal rate of 95% or more as measured by the following measurement method 2.

[Measurement method 2]

A solution of 25.0 ppm of carboxylated polystyrene latex bead with an average particle diameter of 0.2 탆 was added to the solution so that the concentration of hydrochloric acid (HClO) was 2 mg / L in the distilled water, 100 L was passed through the reactor at a flow rate of < RTI ID = 0.0 > At this time, a calibration curve was prepared in advance using a UV-vis spectrophotometer, and the particle removal rate was measured with respect to permeated water.

According to another preferred embodiment of the present invention, the multilayered cartridge filter may have an effective purified water amount of 2,400 L or more as measured by the following measurement method 3.

[Measuring method 3]

The amount of turbidity 1 NTU prepared by adding ISO A2 dust to the distilled water was passed through the cartridge at a flow rate of 2 LPM, and the sum of the flow rates until the point of 20% reduction with respect to the initial flow rate was expressed as the effective purified water amount.

According to another preferred embodiment of the present invention, the multi-layer type cartridge filter may be a filter for a direct water purifier.

On the other hand, in order to solve the above-described problems, the present invention provides a direct water-type water purifier including the above-described multi-layer type cartridge filter.

The multi-layer type cartridge filter of the present invention and the water purifier including the water purifier of the present invention have an excellent organic chemical and chlorine removal rate, an excellent microbial removal rate, and an effective high purified water content.

1 is a cross-sectional view of a cartridge filter according to a preferred embodiment of the present invention.
2 is a cross-sectional view of a post-carbon filtration layer and a bending positive charge filtration layer, in accordance with a preferred embodiment of the present invention.
3 is an enlarged view of a portion A in Fig.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

As described above, the conventional antiviral nonwoven fabric has problems of suitability for the water treatment process and marginality of the applied product group due to the controversy of harmfulness such as carcinogenesis in that it uses glass fiber, and it has excellent organic chemical and chlorine removal rate, At the same time, there is a problem that it is difficult to show an effect of a high effective amount of purified water.

The present invention relates to a VOC and a chlorine-free carbon filter layer, a positive carbonaceous filtration layer formed along an inner circumferential surface of the free carbon filtration layer for removing negative-ionic microorganisms and heavy metals, Layer cartridge filter comprising a void in the cavity and a post-carbon filter layer to remove residual VOC and chlorine, thereby solving the above-mentioned problem.

As a result, it is possible to achieve an excellent organic chemical and chlorine removal rate, an excellent microbial removal rate, and an effective high purified water content.

The multilayer type cartridge filter of the present invention will be described in detail with reference to the drawings.

The multilayered cartridge filter of the present invention may further include a sedimentation layer formed along the outer circumferential surface of the free carbon filtration layer and removing particulate matter of the raw water.

FIG. 1 is a cross-sectional view of a cartridge filter according to a preferred embodiment of the present invention. As shown in FIG. 1, the multi-layered cartridge filter of the present invention includes a cedilla filtration layer 140, A free carbon filter layer 130, a positive carbon filtration layer 120 formed along the inner circumferential surface of the free carbon filtration layer, and a post carbon filtration layer 110 formed along the inner circumferential surface of the positive carbon filtration layer, .

First, the Sedilla filtration layer 140 will be described.

The cedilla filtration layer 140 may be any layer capable of removing particulate matter from the raw water, and preferably a nonwoven fabric may be used. More preferably, the ceded filtration layer 140 may have an average weight of 10 to 100 g / m ² Nonwoven fabric having a thickness of 15 to 80 g / m < ² > can be used.

If the average weight of the nonwoven fabric is less than 10 g / m ^{2, the} particulate matter may not easily be removed, and if the average weight exceeds 100 g / m ² , the filter may not be miniaturized due to an increase in thickness May occur.

Meanwhile, the Cedilla filter layer 140 may have a particle removal rate of 90% or more, and preferably a particle removal rate of 91% or more, with an average particle size of 5 μm. If the particle removal rate of the particles having an average particle size of 5 占 퐉 is less than 90%, the particulate matter in the water may flow into the inner layer, thereby reducing the effective purified water amount of the filter.

Next, the free carbon filtration layer 130 formed along the inner circumferential surface of the Sedilla filtration layer 140 will be described.

The free carbon filtration layer 130 is not particularly limited as long as it is capable of easily removing VOC (volatile organic compound) and chlorine, but it may preferably have a thickness of 10 to 14 mm, more preferably, 11 to 13 mm. If the thickness of the free carbon filtration layer 130 is less than 10 mm, the VOC (volatile organic compound) and chlorine may remain in the effluent due to the decrease in the adsorption amount. If the thickness exceeds 14 mm, the filter may not be miniaturized There is no problem.

On the other hand, the free carbon filtration layer 130 may have a particle removal rate of 90% or more, preferably a particle removal rate of 91% or more, with an average particle size of 3 μm. If the particle removal rate of the particles having an average particle size of 3 占 퐉 is less than 90%, the effective purified water amount may be reduced due to particles introduced into the interior.

Next, the positive charge filtration layer 120 formed along the inner peripheral surface of the free carbon filtration layer 130 will be described.

The positive charge filtration layer 120 serves to remove negative charge microorganisms and heavy metals. In addition, the positive charge filtering layer 120 may have a zeta value of 5 to 50 mV, and preferably a zeta value of 10 to 40 mV. If the zeta value is less than 5 mV, the adsorption performance may be deteriorated and the removal efficiency of microorganisms and heavy metals may be decreased. If the zeta value is more than 50 mV, the adsorption amount may be increased and the effective purified water amount may be decreased.

The positive charge filtration layer 120 may include one selected from a depth type positive charge filtration layer and a bending type positive charge filtration layer.

FIG. 2 is a cross-sectional view of a post-carbon filtration layer and a bending type positive charge filtration layer according to a preferred embodiment of the present invention. As shown in FIG. 2, the cross- The wrinkles of the shape can contact each other along the outer peripheral surface of the post carbon filtration layer 110 and a sufficient number of wrinkles are formed to effectively filter the raw water.

That is, the filter portion may include a first bending portion 121 bent in the outward direction of the post carbon filtering layer and a second bending portion bent inward of the post carbon filtering layer, The bent portion and the second bent portion may be alternately repeatedly formed.

FIG. 3 is an enlarged view of a portion A in FIG. 2, wherein the filter portion includes a first nonwoven fabric containing at least one selected from polypropylene fiber, polyethylene terephthalate fiber, polyethylene fiber, polyester fiber, nylon fiber and cellulose fiber A spunbond layer 124 overlapped with both surfaces of the first nonwoven fabric, and a positive charge coating layer 125 formed on the surfaces of the fiber strands contained in the nonwoven fabric and the surface of the nonwoven fabric.

The positive charge coating layer 125 may be coated so as to completely surround the surface of the fiber strands, rather than being formed in an island shape at the fiber strand surface of the first nonwoven fabric 123.

The positive charge coating layer 125 is preferably formed on the surface of the fiber strands in the first nonwoven fabric 123 and on the surface of the fiber strands in a unit area of 80% or more, more preferably 85% . In the case where the positive charge coating layer is formed on the surface of the fiber strands with a unit area of less than 80%, there is a problem of unevenness of physical properties in which virus adsorption performance becomes uneven due to a decrease in the uniformity of the positive charge coating.

The filter unit may further include a second nonwoven fabric 126 and a membrane 127 which are overlapped on one surface of the first nonwoven fabric 123.

The filter unit according to FIG. 3 is described as being formed by the first nonwoven fabric 123 or the first nonwoven fabric 123 and the second nonwoven fabric 126, but the configuration of the present invention is not limited thereto . For example, a plurality of the first nonwoven fabrics 123 may be laminated, or a plurality of first nonwoven fabrics 123 may be laminated, and then the filter layer may be formed by layering the filtration layers of the membrane 127.

On the other hand, the depth type positive charge filtration layer may include two or more, preferably three or more, positive charge nonwoven fabrics provided to surround the outer surface of the post carbon layer. Specifically, the depth type positive charge filtration layer may include multiple layers of positively charged nonwoven fabric formed by rolling along the outer circumferential surface of the post carbon filtration layer.

The thickness of the positive charge filtration layer 120 may be 8 to 18 mm, and more preferably 10 to 14 mm, although the thickness is not limited as long as it is easy to remove the negative charge microbes and heavy metals. If the thickness of the positive charge filtration layer 120 is less than 8 mm, negatively charged microorganisms and heavy metals may not be removed from the effluent. If the thickness exceeds 18 mm, the pressure difference of the influent water may increase or the pressure resistance may decrease There may be a problem.

Next, a post-carbon filtration layer 110 formed along the inner peripheral surface of the positive charge filtration layer 120 and including a hollow therein will be described.

The thickness of the post-carbon filtration layer 110 is not limited as long as it is capable of easily removing residual VOC (volatile organic compound) and chlorine, but may preferably be 3 to 9 mm, more preferably, May be 4 to 8 mm. If the thickness of the post-carbon filtration layer 110 is less than 3 mm, residual VOC (volatile organic compound) and organic chemical substances may be present in the effluent water. If the thickness is more than 9 mm, May occur.

On the other hand, the post-carbon filtration layer 110 may have a particle removal rate of 90% or more, and preferably a particle removal rate of 91% or more, with an average particle size of 1 占 퐉. If the particle removal rate is less than 90%, the VOC (volatile organic compound) and chlorine may remain in the effluent.

The inner hollow may have a diameter of 8 to 15 mm, and preferably a diameter of 9 to 14 mm. If the diameter of the hollow is less than 8 mm, the flow path of the permeated water is narrow and the flow velocity may be decreased. If the diameter exceeds 14 mm, the thickness of the post carbon may be limited, which may make it difficult to optimize the structural performance.

The free carbon filtration layer may be thicker than the post carbon filtration layer. If the thickness of the post carbon filtration layer is thinner than or equal to that of the free carbon filtration layer, a differential pressure of permeated water may be generated to reduce the permeation flux and the effective purified water amount.

On the other hand, the raw water may flow outside from the sedimentation filtration layer, be filtered, and then be discharged through the hollow. Specifically, as described above, the raw water flows from the outside of the Sediment filtration layer, passes through the Sediment filtration layer, removes the particulate matter of the raw water, passes through the free carbon filtration layer formed along the inner peripheral surface of the Sediment filtration layer, And chlorine are removed and passed through a positive charge filtration layer formed along the inner circumferential surface of the free carbon filtration layer to remove negative charge microorganisms and heavy metals and finally pass through a post carbon filtration layer formed along the inner circumferential surface of the positive charge filtration layer, VOC and chlorine can be removed and spilled through the hollow.

Meanwhile, the multi-layer type cartridge filter may have a chlorine removal capability of 5,900 L or more, preferably 5,950 L or more, as measured by the following measurement method 1.

[Measurement method 1]

The solution dropped to distilled water to a concentration of 2 mg / L of hypochlorous acid (HClO) was flowed into the cartridge at a flow rate of 2 LPM, and the chlorine concentration was analyzed by ion chromatography on the influent and permeated water. At this time, the flow rate passed through until the chlorine removal efficiency of less than 90% was indicated by the chlorine removal ability.

If the chlorine removal capability is less than 5,900 L, the filter may not have a good service life, and chlorine may remain in the effluent water later.

The multi-layer type cartridge filter has a particle removal rate of 95% or more, preferably 97% or more, more preferably 98% or more, more preferably 99% or more, and most preferably, 100%.

[Measurement method 2]

A solution of 25.0 ppm of carboxylated polystyrene latex bead with an average particle diameter of 0.2 탆 was added to the solution so that the concentration of hydrochloric acid (HClO) was 2 mg / L in the distilled water, 100 L was passed through the reactor at a flow rate of < RTI ID = 0.0 > At this time, a calibration curve was prepared in advance using a UV-vis spectrophotometer, and the particle removal rate was measured with respect to permeated water.

If the particle removal rate is less than 95%, the life of the filter is not good, and viruses and microorganisms may remain in the effluent water in the future.

In addition, the multilayer type cartridge filter may have an effective purified water amount of 2,400 L or more, preferably 2,450 L or more, as measured by the following Measuring Method 3.

[Measuring method 3]

The amount of turbidity 1 NTU prepared by adding ISO A2 dust to the distilled water was passed through the cartridge at a flow rate of 2 LPM, and the sum of the flow rates until the point of 20% reduction with respect to the initial flow rate was expressed as the effective purified water amount.

If the effective purified water amount is less than 2,400 L, the life of the filter may be poor.

The multi-layer type cartridge according to the present invention will be described with reference to a manufacturing method.

Wherein the multilayered cartridge comprises a step of fabricating a positively charged filtration layer comprising positive charge nonwoven fabric and a step of laminating a post carbon filtration layer, a positive charge filtration layer, a free carbon filtration layer and a cedi filtration layer in order, ≪ / RTI >

First, the positive charge filtration layer will be described.

The positive charge filtration layer of the present invention can be produced by precipitating a nonwoven fabric in a positive charge coating agent followed by thermal crosslinking. Specifically, a step of depositing a bending filter layer or a depth-type filtration layer on a positive charge coating agent containing 0.1 to 5 parts by weight of a crosslinking agent and a polyfunctional amine compound per 100 parts by weight of the hydrophilic organic solvent to coat the positive charge coating agent with the coating agent, And forming a positive charge coating layer by thermally crosslinking the bending type filter layer or the depth type filtration layer coated with the coating agent. The present invention will be described in more detail step by step.

The types and characteristics of the nonwoven fabric described in this manufacturing method are the same as those described above.

The crosslinking agent serves not only to serve as a crosslinking agent and a binder between the polyfunctional amine compound but also to improve the adhesion between the nonwoven fabric and the coating component. Examples of the crosslinking agent include bisphenol A epoxy resin, bisphenol F epoxy resin, hydrogenated bisphenol A epoxy resin, A hydrogenated bisphenol F epoxy resin, a brominated epoxy resin and a Novolac type epoxy resin, or a mixture of two or more selected from the group consisting of a bisphenol A epoxy resin, a bisphenol F epoxy A hydrogenated bisphenol A epoxy resin, a hydrogenated bisphenol F epoxy resin, and a Novolac type epoxy resin, more preferably one or more selected from the group consisting of a bisphenol A epoxy resin, a hydrogenated bisphenol A An epoxy resin and a Novolac type epoxy resin. Can be mixed and used.

Also, the polyfunctional amine compound plays a role of imparting the electrostatic property showing positive charge, and it can be produced by mixing one or two or more selected from the group consisting of polyethyleneimine, diethylene triamine, piperazine, dimethylene piperazine and diphenylamine And preferably one or two or more selected from polyethyleneimine and diethylenetriamine can be mixed and used.

The multifunctional amine compound and the cross-linking agent can be dissolved in a hydrophilic organic solvent to control the concentration, thereby controlling the viscosity and adsorption degree of the coating agent. Further, hydrophobic nonwoven fabric fibers can be coated using a hydrophilic organic solvent to modify the nonwoven fabric to be hydrophilic. The hydrophilic organic solvent preferably contains 80 to 95% by weight of glycol solvent and 5 to 20% by weight of water, more preferably 85 to 95% by weight and water of 5 to 15% by weight. In the hydrophilic organic solvent, when the glycol solvent is contained in an amount of less than 80% by weight, the coating solution is unevenly formed and the coating layer is difficult to form on the surface of the fiber strands contained in the nonwoven fabric. The reaction between the crosslinking agent and the amine compound is generated in the solution, thereby reducing the efficiency of coating the nonwoven fabric.

The precipitation is preferably carried out at 5 ° C to 40 ° C for 5 seconds to 12 hours, preferably at 20 ° C to 30 ° C. At this time, And there may be a change over time in the harmful environment and the concentration of the coating solution due to the generation of solvent vapor at a temperature exceeding 40 ° C, so that the precipitation is preferably carried out in the above temperature range. The precipitation time is preferably 5 seconds to 15 hours, preferably 20 seconds to 13 hours.

On the other hand, in the step of thermally crosslinking the nonwoven fabric coated with the positive charge coating agent to form a positive charge coating layer, it is preferable to perform the crosslinking at 60 ° C to 130 ° C, more preferably at 80 ° C to 100 ° C, If the crosslinking temperature is lower than 60 ° C, the crosslinking reaction between the crosslinking agent and the amine compound may not be sufficiently carried out, resulting in a problem of deterioration of physical properties and efficiency of the manufacturing process. If the crosslinking temperature exceeds 130 ° C, It is preferable to perform thermal crosslinking within the above-mentioned temperature range. The heat crosslinking time varies depending on the heat crosslinking temperature. It is preferably carried out for about 15 seconds to 6 hours, preferably for 30 seconds to 4 hours.

Thereafter, in the multilayered cartridge of the present invention, a cylindrical post-carbon filtration layer is placed, and the produced positive charge filtration layer is wound along the outer peripheral surface of the post-carbon filtration layer to form a depth- A bending type filtration layer which is folded in a bundle is selectively located and a free carbon filtration layer is positioned along the outer peripheral surface of the positive charge filtration layer and finally a coarse filtration layer is wound around the outer peripheral surface of the free carbon filtration layer .

Meanwhile, the multi-layer type cartridge filter according to the present invention may be a filter for a direct water type purifier, and the present invention provides a direct water type purifier including the above-described multilayer type cartridge filter.

Hereinafter, the present invention will be described with reference to the following examples. The following examples are provided to illustrate the invention, but the scope of the present invention is not limited by the following examples.

[ Example ]

Preparation Example  One : Depth type  Manufacture of positive charge filtration layer

10 parts by weight of distilled water and 88 parts by weight of diethylene glycol ethyl ester were mixed with 1 part by weight of polyethyleneimine and 1 part by weight of novolak type epoxy resin and stirred at 25 DEG C for 30 minutes to prepare a positive charge coating agent.

Next, a polypropylene nonwoven fabric having an average pore size of 16 mu m, an average fineness of 3 mu m, and an average thickness of 700 mu m was immersed in the positive charge coating agent at 25 DEG C for 30 seconds, taken out of the bag, thermally crosslinked at 110 DEG C for 30 minutes A bending type positive charge filtration layer with a zeta value of 35 mV was prepared.

Preparation Example  2 : Bending type  Manufacture of positive charge filtration layer

The first nonwoven fabric prepared through Preparation Example 1, the second nonwoven fabric of the same material as the first nonwoven fabric, and the polyimide sulfone membrane having an average pore diameter of 0.4 탆 were sequentially laminated and folded to form a bending type positive charge filtration layer .

Example  1: Manufacture of multilayer cartridge filter

A post carbon filtration layer 8 mm in thickness composed of activated carbon having a hollow size of 10 mm in inner diameter and having a removal rate of 90% or more for particles having a diameter of 1 탆, a depth type positive charge filtration layer 10 mm in thickness according to Preparation Example 1, A free carbon filtration layer having a thickness of 13 mm and activated carbon having a removal rate of 90% or more for particles of 탆, a cedilla filtration layer having a removal rate of 90% or more and an average density of 35 g / m ² and a thickness of 4 mm To produce a multi-layer cartridge filter.

Example  2

Layer cartridge filter was fabricated in the same manner as in Example 1 except that the positive charge filtration layer was replaced with the positive charge filtration layer according to Preparation Example 2.

Example  3

Layer cartridge filter was fabricated in the same manner as in Example 1 except that the thickness of the post carbon layer was changed to 12 mm and the thickness of the free carbon layer was changed to 9 mm.

Example  4

A multilayer cartridge filter was fabricated in the same manner as in Example 1 except for the cedilla filter layer.

Comparative Example  One

Layer cartridge filter was fabricated in the same manner as in Example 1 except that the positive charge filtration layer was changed to a polypropylene nonwoven fabric having an average pore diameter of 6 μm, a fineness of 3 μm and an average thickness of 700 μm.

Comparative Example  2

Layer cartridge filter except that the positive charge filter layer was fabricated in the same manner as in Example 1.

Comparative Example  3

A multilayer cartridge filter was prepared in the same manner as in Example 1 except for the free carbon filter layer.

Experimental Example  One : Chlorine removal ability  Measure

For the multi-layer type cartridge filters manufactured according to Examples 1 to 4 and Comparative Examples 1 to 3, the chlorine removal ability was measured by measuring the chlorination ability of the filter in accordance with the test method of Food Water Quality Test Standard 2012-143.

Specifically, a solution dropwise added with distilled water to a concentration of 2 mg / L of hypochlorous acid (HClO) was flowed into the cartridge at a flow rate of 2 LPM, and chlorine concentration was analyzed by ion chromatography on influent and permeated water. At this time, the flow rate passed through until the chlorine removal efficiency of less than 90% was indicated by the chlorine removal ability.

Experimental Example  2: Measurement of particle removal rate

For the microbial removal rate analysis of the multi-layer type cartridge filters manufactured according to Examples 1 to 4 and Comparative Examples 1 to 3, the removal rate using bead treated with surface negative charge was analyzed by substitute analysis.

Specifically, a solution of 25.0 ppm of carboxylated polystyrene latex bead having an average particle diameter of 0.2 탆 was added to distilled water so that the concentration of hydrochloric acid (HClO) was 2 mg / L and stirred. At a flow rate of 2 LPM. At this time, a calibration curve was prepared in advance using a UV-vis spectrophotometer, and the particle removal rate was measured with respect to permeated water.

Experimental Example  3: Effective water quantity  Measure

In order to measure the effective purified water amount for the multilayer type cartridge filters manufactured according to Examples 1 to 4 and Comparative Examples 1 to 3, analysis using ISO A2 dust particles was performed.

Specifically, the total amount of water up to the point where the turbidity of 1 NTU produced by adding ISO A2 dust to the distilled water was passed through the cartridge at a flow rate of 2 LPM to the point where the initial flow was reduced by 20% was expressed as an effective purified water amount .

division Chlorine removal (L) Particle removal rate (%) Effective water quantity (L) Example 1 6,250 100 2,620 Example 2 5,980 100 2,500 Example 3 5,870 99 2,050 Example 4 5,850 100 1,670 Comparative Example 1 6,150 14 2,890 Comparative Example 2 6,300 3 2,740 Comparative Example 3 2,640 64 1,740

As shown in Table 1, the multi-layer type cartridge filter according to the present invention has a structure in which the thickness of the post carbon filter layer is 8 mm, the thickness of the free carbon filter layer is 12 mm, and the free carbon filter layer is thinner than the post carbon filter layer 3, and the positive charge nonwoven fabric or the free carbon filtration layer were omitted, compared with Comparative Examples 1 to 3, the chlorine removal performance, the particle removal rate and the effective purified water amount were superior.

110: Post carbon filtration layer 120: Positive charge filtration layer
121: first bent portion 122: second bent portion
123: first nonwoven fabric 124: span board layer
125: positive charge coating layer 126: second nonwoven fabric
127: membrane filtration layer 130: free carbon filtration layer
140: Cedilla filter bed

Claims (20)

A free carbon filtration layer for removing VOC and chlorine;
A positive charge filtration layer formed along the inner circumferential surface of the free carbon filtration layer to remove negative charged microorganisms and heavy metals; And
And a post-carbon filter layer formed along the inner circumferential surface of the positive charge filtration layer and containing a hollow therein to remove residual VOC and chlorine. 2. The filter according to claim 1, further comprising: a sedimentation layer formed along an outer circumferential surface of the free carbon filtration layer and removing particulate matter of raw water,
Wherein the Cedilla filter layer comprises a nonwoven fabric having a particle removal rate of 90% or more with an average particle size of 5 占 퐉. The multi-layer type cartridge filter according to claim 1, wherein the positive charge filtration layer is one selected from a depth type positive charge filtration layer and a bending type positive charge filtration layer. The method of claim 1, wherein the free carbon filtration layer comprises activated carbon having a particle removal rate of 90% or more with an average particle size of 3 占 퐉,
Wherein the post-carbon filter layer comprises activated carbon having a particle removal rate of 90% or more with an average particle size of 1 占 퐉. The multilayer cartridge filter according to claim 1, wherein the positive charge filtration layer has a zeta value of 5 to 50 mV. 4. The device of claim 3, wherein the depth-type positive charge filtration layer
And two or more positive charge nonwoven fabrics provided to surround the outer circumferential surface of the post carbon layer. 4. The method of claim 3, wherein the bending type positive charge filtration layer
And a filter portion provided to surround the outer peripheral surface of the post-carbon filtration layer in a bent shape in cross section. [8] The filter according to claim 7, wherein the filter unit comprises: a first nonwoven fabric containing at least one selected from polypropylene fiber, polyethylene terephthalate fiber, polyethylene fiber, polyester fiber, nylon fiber and cellulose fiber; A span board layer superposed on both sides of the first nonwoven fabric; And a positive charge coating layer formed on the surface of the fiber strands contained in the inside and the surface of the nonwoven fabric. The filter according to claim 7, wherein the filter portion includes a first bent portion bent in the outward direction of the post carbon filtering layer and a second bent portion bent inward in the post carbon filtering layer,
Wherein the first bent portion and the second bent portion are alternately repeatedly formed. The multi-layered cartridge filter according to claim 8, further comprising a second nonwoven fabric and a membrane overlapping one surface of the first nonwoven fabric. 11. The multilayer cartridge filter according to claim 10, wherein the membrane is a polysulfone-based membrane having a pore size of 0.1 to 0.6 mu m. The method of claim 2, wherein the cedilla filtration layer has a thickness of 0 to 4 mm, the free carbon filtration layer has a thickness of 10 to 14 mm, the positive charge filtration layer has a thickness of 8 to 18 mm and the post carbon filtration layer has a thickness of 3 to 9 mm. < / RTI > The multi-layer cartridge filter of claim 1, wherein the free carbon filtration layer is thicker than the post carbon filtration layer. The multi-layer cartridge filter according to claim 1, wherein the hollow has a diameter of 8 to 15 mm. 3. The method of claim 2, wherein the raw water is introduced from the outside of the sedimentary layer and filtered,
And the flow-out through the hollow. The multi-layer type cartridge filter according to claim 1, wherein the multi-layer type cartridge filter has a chlorine removal capability of 5,900 L or more as measured by the following measurement method 1.
[Measurement method 1]
The solution dropped to distilled water to a concentration of 2 mg / L of hypochlorous acid (HClO) was flowed into the cartridge at a flow rate of 2 LPM, and the chlorine concentration was analyzed by ion chromatography on the influent and permeated water. At this time, the flow rate passed through until the chlorine removal efficiency of less than 90% was indicated by the chlorine removal ability. The multi-layer type cartridge filter according to claim 1, wherein the multilayered cartridge filter has a particle removal rate of 95% or more as measured by the following measurement method (2).
[Measurement method 2]
A solution of 25.0 ppm of carboxylated polystyrene latex bead with an average particle diameter of 0.2 탆 was added to the solution so that the concentration of hydrochloric acid (HClO) was 2 mg / L in the distilled water, 100 L was passed through the reactor at a flow rate of < RTI ID = 0.0 > At this time, a calibration curve was prepared in advance using a UV-vis spectrophotometer, and the particle removal rate was measured with respect to permeated water. The multi-layer type cartridge filter according to claim 1, wherein the multilayer type cartridge filter has an effective purified water amount of 2,400 L or more as measured by the following measurement method (3).
[Measuring method 3]
The amount of turbidity 1 NTU prepared by adding ISO A2 dust to the distilled water was passed through the cartridge at a flow rate of 2 LPM, and the sum of the flow rates until the point of 20% reduction with respect to the initial flow rate was expressed as the effective purified water amount. The multi-layer type cartridge filter according to claim 1, wherein the multi-layer type cartridge filter is a filter for a direct water purifier. A direct water type purifier including the multilayered cartridge filter according to any one of claims 1 to 19.

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