KR20100053440A - Reverse osmosis water purifier having simple filter configuration - Google Patents

Abstract

PURPOSE: A reverse osmosis water purifier with a simplified filter part is provided to make high quality drinking water by restricting breeding of microorganism or virus, and to reduce a size of the reverse osmosis water purifier by eliminating a pre-carbon filter. CONSTITUTION: A reverse osmosis water purifier includes a chlorine resistance polyamide composite film(3) capable of performing a removing function of remaining chlorine in a pre-carbon filter and a function of a polyamide composite film. A filter part is simplified by eliminating the pre-carbon filter. The reverse osmosis water purifier comprises a sedimentation filter(2), the chlorine resistance polyamide composite film consisting of a post-carbon filter(4), and a storage part consisting of a purified water storage tank. The chlorine resistance polyamide composite film is an alkylated chlorine resistance polyamide composite film.

Description

REVERSE OSMOSIS WATER PURIFIER HAVING SIMPLE FILTER CONFIGURATION}

The present invention relates to a reverse osmosis water purifier with a simplified configuration of a filter part, and more particularly, a sun carbon filter is omitted according to a filter part including a precipitation filter, a chlorine resistant polyamide composite membrane, and a post carbon filter. The present invention relates to a reverse osmosis water purifier that can be slimmed and passes a trace amount of residual chlorine to the rear end of a chlorine-resistant polyamide composite membrane to suppress the survival of microorganisms or viruses in a post carbon filter or a purified water storage tank.

Ultrafiltration membranes (UF) and polyamide-based composite membranes (nano-separation membranes and reverse osmosis membranes) are typical membranes used in water purifiers. Among them, polyamide-based composite membranes have pores with a surface size of 0.001 μm, which is organic and inorganic. Reverse osmosis water purifiers equipped with polyamide-based composite membranes account for a large proportion in the water purifier market, with removal rates of more than 90% for ionic substances including materials, bacteria, viruses, and heavy metals.

The general reverse osmosis water purifier structure referring to FIG. 3 includes a water intake valve 1, a sedimentation filter 2, a sun carbon filter 9, a boost pump 8, a polyamide-based composite membrane 10, and a fucarbon filter 4 , Non-return valve (not shown), household water control valve (not shown) and Water control valve 5 or the like.

Precipitation filter (2) removes suspended solids from raw water and relatively large impurities such as sand, debris, and moss. Sun carbon filter (9) removes volatile organic compounds such as pesticides and carcinogens from raw water. As a most important function, residual chlorine is removed to prevent oxidation and decomposition of the polyamide composite membrane in the latter stage by residual chlorine. The polyamide composite membrane 10 filters ionic substances including organic and inorganic contaminants, bacteria, viruses, and heavy metals contained in raw water, and the fucarbon filter 4 removes gaseous substances contained in raw water. It removes the smell of water and improves the taste of water.

The reverse osmosis water purifier composed of a conventional precipitation filter, a sun carbon filter, a polyamide composite membrane, and a post carbon filter is composed of four filters and is difficult to use in a narrow space due to its large volume. There is a problem that application is difficult.

In addition, it is difficult to determine the filter life or replacement time, and due to the complexity of the filter (sedimentation filter, sun carbon filter, polyamide composite membrane, after carbon filter) mounted on the reverse osmosis water filter part, it is difficult for the user to replace it himself.

Therefore, in order to overcome the disadvantages of the reverse osmosis water purifier volume, in Korea Patent Publication Nos. 2004-0042180, 2004-0042181, and 2005-0022694, the size of the sedimentation filter and the sun carbon filter is reduced to unify the composite filter, and one. A composite filter, a polyamide composite membrane, and a post carbon filter were formed in the filter part case of to reduce the volume of the reverse osmosis water purifier.

However, since the reverse osmosis water purifier includes a sun carbon filter having a reduced size, the reverse osmosis water purifier of the sun carbon filter has a function of protecting a polyamide composite membrane from chlorine, trihalomethane (THM), and volatile organic chemicals. As the water treatment capacity is reduced, there is a problem that the service life of the filter is shortened.

In addition, the membrane used in most reverse osmosis water purifiers uses a polyamide material, which is very vulnerable to residual chlorine. Therefore, the residual chlorine component should be sufficiently removed from the sun carbon filter, and if the residual chlorine removal performance of the sun carbon filter decreases, the residual chlorine component directly affects the polyamide composite membrane, which may cause a problem of membrane destruction. As a result, the salt removal rate of the reverse osmosis water purifier decreases, and ionic substances including organic and inorganic pollutants, bacteria, viruses, and heavy metals can be introduced into the fucarbon filter as it is, and the fucarbon filter located at the rear of the polyamide composite membrane If it is not purified, contaminated drinking water may be provided, which may be harmful to the human body.

In addition, even if the removal performance of the polyamide composite membrane is not impaired, residual chlorine is completely removed from the sun carbon filter and the polyamide composite membrane filter, so that there is a risk of microorganisms or bacteria living inside the fucarbon filter to provide high quality drinking water. Can not.

Accordingly, the present inventors apply a chlorine-resistant polyamide composite membrane that does not require a sun carbon filter to solve the problems of the prior art, and the structure of the filter unit is simplified to make the volume of the reverse osmosis water purifier slim, and the chlorine-resistant polyamide composite membrane The present invention was completed by confirming that a small amount of residual chlorine component was passed to the rear end to inhibit microbial or virus survival inside the after-carbon filter or the purified water storage tank.

SUMMARY OF THE INVENTION An object of the present invention is to provide a reverse osmosis water purifier with a simplified chlorine-resistant polyamide composite membrane and a configuration of a filter unit in which a sun carbon filter is removed.

Another object of the present invention is to provide a reverse osmosis water purifier in which the survival of microorganisms or viruses is inhibited by passing a trace amount of residual chlorine to the rear end of the chlorine resistant polyamide composite membrane.

In order to achieve the above object, the present invention, in the reverse osmosis water purifier consisting of the filter unit of the precipitation filter, the sun carbon filter, the polyamide composite membrane and the after carbon filter, the residual chlorine removal function and the function of the polyamide composite membrane of the sun carbon filter Simultaneously, the chlorine-resistant polyamide composite membrane which does not require a sun carbon filter is provided, thereby providing a reverse osmosis water purifier with a simplified configuration of the filter unit from which the sun carbon filter is removed.

The reverse osmosis water purifier may be sequentially connected to a filter unit consisting of a precipitation filter, a chlorine resistant polyamide composite membrane, and a carbon filter and a storage unit consisting of a purified water storage tank.

In addition, the reverse osmosis water purifier of the filter portion consisting of a precipitation filter, a chlorine-resistant polyamide composite membrane and a fucarbon filter, the storage unit consisting of a purified water storage tank between the chlorine-resistant polyamide composite membrane and the fucarbon filter is connected sequentially Can be.

In this case, the chlorine resistant polyamide composite membrane is an alkylated polyamide composite membrane.

The chlorine resistant polyamide composite membrane has at least 85% salt when passing through sodium hypochlorite solution at a concentration of 500 to 2,000 ppm for 1 to 24 hours. Chlorine durability to maintain the removal performance is secured, the chlorine-resistant polyamide composite membrane can secure a permeate flow rate of at least 10GFD (gallon · ft ² / day) when passing 250 ppm sodium chloride (NaCl) solution at 60psi pressure Can be.

In addition, the chlorine resistant polyamide composite membrane transmits at least 20% or more of residual chlorine in raw water.

Reverse osmosis water purifier of the present invention is composed of a filter portion consisting of a precipitation filter, a chlorine-resistant polyamide composite membrane and a post carbon filter, the sun carbon filter is removed to simplify the structure of the filter portion, trace amount to the rear end of the chlorine-resistant polyamide composite membrane Residual chlorine component of the permeate penetrates the survival of microorganisms or viruses by trace amount of chlorine in the carbon filter or purified water storage tank. The utilization of is excellent.

Hereinafter, the present invention will be described in more detail.

The present invention, in the reverse osmosis water purifier consisting of the filter unit of the precipitation filter, the line carbon filter, the polyamide composite membrane and the after carbon filter, by performing the functions of removing the residual chlorine and polyamide composite membrane of the sun carbon filter at the same time It is provided with a chlorine-resistant polyamide composite membrane that does not require, provides a reverse osmosis water purifier with a simplified configuration of the filter portion from which the sun carbon filter is removed.

More specifically, the present invention omits the line carbon filter 9 in the components of the reverse osmosis water purifier, and consists of a precipitation filter 2, a chlorine resistant polyamide composite membrane 3, and a fu carbon filter 4. The chlorine-resistant polyamide composite membrane 3 has a function of the sun carbon filter 9 to protect the conventional polyamide composite membrane 10 from trihalomethane (THM), volatile organic chemicals, etc. By simultaneously performing the function of the polyamide composite membrane 10, while maintaining the excellent water purification effect, the configuration of the filter unit is simplified to make the reverse osmosis water purifier slimmer.

The chlorine resistant polyamide composite membrane applied to the present invention is excellent in chlorine resistance, so that the membrane is not damaged by the chlorine component contained in raw water, and when passed through sodium hypochlorite (NaOCl) solution having a concentration of 500 to 2,000 ppm for 1 to 24 hours. Maintains at least 85% salt removal performance. More preferably, the chlorine resistant polyamide composite membrane has a chlorine durability that maintains at least 85% salt removal performance when passing a 250 ppm sodium chloride (NaCl) solution at a pressure of 60 psi after passing the residual chlorine at a concentration of 2 ppm for 1,000 hours. Secured polyamide composite membrane.

In addition, The chlorine-resistant polyamide composite membrane implements a high permeation flow rate. Specifically, when passing through a 250 ppm sodium chloride (NaCl) solution at a pressure of 60 psi, a permeation flow rate of 10GFD (gallon · ft ² / day) or more can be secured.

In this case, the chlorine-resistant polyamide composite membrane is coated with a amine aqueous solution dissolved alone or mixed with a polyfunctional aliphatic amine, a polyfunctional aromatic amine or a substituent thereof on a porous support, and then remove the excess aqueous solution, polyfunctional acyl halide, The polyfunctional sulfonyl halide and the polyfunctional isocyanate are obtained through a separate secondary treatment after preparation by interfacial polymerization of an organic solution containing a compound alone or mixed.

In the method for preparing the chlorine-resistant polyamide composite membrane, a second treatment is performed by submerging the polyamide membrane formed on the microporous support in a post-treatment solution to replace a hydrogen group with an alkyl group at an amide bond (-NHCO-) of polyamide. An alkylated amide bond (-NHRO-) is generated, and hydrogen of the amide bond (-NHCO-) is substituted with an alkyl group, thereby making it possible to prepare a polyamide composite membrane having excellent chlorine durability.

At this time, the alkylating agent is dimethyl sulfate, methyl iodide, methyl bromide, ethyl iodide, ethyl bromide, propyl iodide, propyl bromide, allyl iodide, allyl bromide, allyl chloride, ethylene di iodide, ethylene dibromide Any one or more selected from the group consisting of trimethylene di iodide and trimethylene dibromide can be preferably used.

In addition, the chlorine resistant polyamide composite membrane has some residual chlorine, preferably at least 20% or more, more preferably 30% or more, without being affected by residual chlorine in tap water as chlorine durability is ensured. By transmitting the traces of chlorine in the carbon filter or the purified water storage tank to eliminate the possibility of incubation of microorganisms or bacteria.

At this time, when the normal tap water is used as raw water (residual chlorine 2ppm or less), if the permeation of residual chlorine is less than 20%, there is a problem that insufficient chlorine content in the fucarbon filter or the purified water storage tank is insufficient to remove microorganisms or bacteria. .

The overall configuration and operation of the reverse osmosis water purifier in which the configuration of the filter unit of the present invention is simplified will be described in detail with reference to FIGS. 1 and 2.

Reverse osmosis water purifier of the present invention may be composed of a structure consisting of a filter consisting of a precipitation filter, a chlorine-resistant polyamide composite membrane and a carbon filter and a storage consisting of a purified water storage tank sequentially.

Referring to FIG. 1, which is a preferred embodiment of the present invention, the reverse osmosis water purifier of the present invention uses a water pressure and gravity (natural pressure) through a water intake valve 1 directly connected to a water pipe, which is a conventional water intake method. The tap water is supplied, and the filter part is composed of a precipitation filter 2, a chlorine resistant polyamide composite membrane 3, and a fucarbon filter 4.

At this time, the precipitation filter 2 removes relatively large impurities such as suspended matter, sand rust, and moss in water, and the chlorine-resistant polyamide composite membrane 3 contains organic and inorganic contaminants from raw water introduced from the precipitation filter. It filters ionic substances, including bacteria, viruses, and heavy metals, removes some residual chlorine, and sends trace residual chlorine to the rear end.

Wastewater that does not pass through the chlorine resistant polyamide composite membrane 3 is connected to the wastewater pipe 6 and is discarded. The purified water contains a small amount of residual chlorine and flows into the fucarbon filter 4. The fucarbon filter 4 removes microorganisms and viruses that may be present in the fucarbon filter 4 from the trace amount of chlorine contained in the raw water introduced from the chlorine resistant polyamide composite membrane 3 and at the same time, the gaseous substance. It removes the smell of water to improve the taste of water.

The purified water flows out into the pipe connected to the after carbon filter 4 and is sent to the purified water storage tank 7, and the water level is controlled by the purified water control valve 5 in front of the purified water storage tank 7.

The reverse osmosis water purifier of the present invention is also provided with a storage unit consisting of a purified water storage tank between the chlorine resistant polyamide composite membrane and the fucarbon filter, among the filter units consisting of a precipitation filter, a chlorine resistant polyamide composite membrane and a fucarbon filter. It can be configured as a sequentially connected structure.

Referring to FIG. 2, which is another preferred embodiment of the present invention, the reverse osmosis water purifier of the present invention is passed through the sedimentation filter 2 and through the chlorine resistant polyamide composite membrane 3 to be sent to the purified water storage tank 7. Stored again, water pressure and The purified water passes through the fucarbon filter 4 through gravity (natural pressure).

That is, the present invention can provide a slender water purifier by omitting the sun carbon filter in the configuration of the reverse osmosis water purifier and applying a chlorine resistant polyamide composite membrane, and the chlorine resistant polyamide composite membrane has a residual amount of chlorine at a rear end thereof. By permeation, a trace amount of chlorine is contained in the fu carbon filter or the purified water storage tank, so that microorganisms or viruses are removed at the source to provide high quality drinking water.

In addition, the chlorine-resistant polyamide composite membrane applied to the present invention has a high permeation flow rate, so that water can be supplied by water pressure and gravity (natural pressure) when applied to a reverse osmosis water purifier.

Hereinafter, the present invention will be described in detail with reference to examples.

The following examples are merely illustrative of the present invention, but the scope of the present invention is not limited to the following examples.

< Production Example  1>

Chlorine Tolerance Polyamide Composite membrane  Produce

A 140 μm thick porous polysulfone support cast on a nonwoven fabric was immersed in 2 wt% metaphenylenediamine (MPD) and 0.2 wt% aqueous ethyl hexanediol (2-ethyl-1,3-hexanediol, EHD) for 20 seconds. It was immersed. After removing the excess aqueous solution of amine on the support and then immersed in 0.1% by weight trimethoyl chloride (TMC) organic solution using ISOPAR-C (Exxon) solvent for 40 seconds, dried in air and in 0.2% by weight aqueous sodium carbonate solution It was washed with water at room temperature for 2 hours. The obtained polyamide membrane was subjected to alkylation for 30 minutes under 100 ppm dimethylsulfate (DMS) and a basic condition of pH 11 and 225 psi pressure. At this time, the basic condition of pH 11 was adjusted with sodium hydroxide.

The obtained polyamide membrane was prepared in the form of a spiral wound module having a diameter of 1.8 inches and an effective membrane area of 4.8 ft ² to prepare a chlorine-resistant polyamide composite membrane.

< Production Example  2>

Polyamide Composite membrane  Produce

A polyamide composite membrane was prepared in the same manner as in Preparation Example 1, except that the alkylation treatment with dimethyl sulfate was not performed.

< Example  1>

As shown in FIG. 1, the filter unit was operated by constructing a reverse osmosis water purifier composed of a precipitation filter-a chlorine resistant polyamide composite membrane-a fucarbon filter.

< Example  2>

As shown in FIG. 2, the filter unit was operated by constructing a water purifier composed of a sedimentation filter, a chlorine resistant polyamide composite membrane, a purified water storage tank, and a fucarbon filter.

< Comparative example  1>

As shown in FIG. 3, the filter unit structure was constructed in the same manner as in Example 1 by operating a conventional water purifier composed of a sedimentation filter, a sun carbon filter, a boost pump, a polyamide composite membrane, and a fu carbon filter. .

< Comparative example  2>

The same operation as in Example 1 was carried out except that the polyamide composite membrane was mounted instead of the chlorine resistant polyamide composite membrane.

< Comparative example  3>

Except that the boosting pump was omitted, the water purifier was configured and operated in the same manner as in Comparative Example 1.

< Experimental Example >

1. Measurement of residual chlorine transmittance

Residual chlorine permeability was measured at the rear end of each filter unit of Examples 1 and 2 and Comparative Examples 1 and 2, respectively. Residual chlorine permeability is shown in Table 1 below the residual chlorine permeability values of the production water in each step compared to the raw water using tap water having a concentration of 0.5 ppm and a conductivity of 250 ± 5uS / cm at room temperature as raw water.

Example 1 Example 2 Comparative Example 1 Comparative Example 2 Sedimentation filter 93% 94% 91% 92% Sun Carbon Filter - - 2% - Polyamide Composite Membrane 67% 66% 0% 75% Fu Carbon Filter 0% 0% 0% 0%

As a result of Table 1, in Examples 1 and 2, residual chlorine was permeated by 67% and 66% in the polyamide composite membrane, whereas in Comparative Example 1, residual chlorine was 2% in the sun carbon filter. It can be seen that 0% is transmitted in the polyamide composite membrane.

2. Salt Removal Rate Measurement

The reverse osmosis water purifiers configured in Examples 1 and 2 and Comparative Examples 1 and 2 were operated at a pressure of 38 ± 2 psi using tap water having a residual chlorine concentration of 0.5 ppm and a conductivity of 250 ± 5 uS / cm at room temperature. . The run was repeated for 12 hours, then stopped for 12 hours and operated for 60 days. Finally, the salt removal rate was measured and the results are shown in Table 2 below.

division Initial salt removal rate Salt removal rate after 60 days Example 1 95.4% 96.6% Example 2 95.7% 96.8% Comparative Example 1 95.6% 95.0% Comparative Example 2 95.3% 80.1%

As a result of measuring the salt removal rate of Table 2, the reverse osmosis water purifiers of Examples 1 and 2 to which the chlorine resistant polyamide composite membrane was applied had almost no decrease in the salt removal rate as the difference between the initial salt removal rate and the salt removal rate after about 60 days was about 1%.

On the other hand, in Comparative Example 2 to which the general polyamide composite membrane was applied, the polyamide layer of the polyamide composite membrane was destroyed by the chlorine component, and the salt removal rate rapidly dropped from 95.3% to 80.1% after 60 days.

3. Antimicrobial measurement

Experiments were performed to examine the antimicrobial properties of the produced water that permeated the polyamide composite membranes of Examples 1 and 2 and Comparative Examples 1 and 2.

Escherichia coli incubated in 10 mL BHI liquid medium coli ) was inoculated at 200 mL PBS buffer to a concentration of 10 ⁶ cell / mL, and the production water that permeated the polyamide composite membranes of Examples 1, 2 and Comparative Examples 1, 2 and 1 mL was added to the medium and then incubated at 35 ° C. Escherichia coli after 24 hours incubation coli ) was observed to determine the antimicrobial properties.

division Initial bacterial count After 24 hours Antibacterial rate (%) Example 1 1.60 × 10 ⁶ 1.20 × 10 ² 99.99 Example 2 1.60 × 10 ⁶ 1.40 × 10 ² 99.99 Comparative Example 1 1.60 × 10 ⁶ 7.50 × 10 ⁵ 53.13 Comparative Example 2 1.60 × 10 ⁶ 1.10 × 10 ² 99.99

From the results of Table 3, the production water according to Examples 1 and 2 shows a high antimicrobial activity of 99.99% antimicrobial, while Comparative Example 1 while the chlorine component contained in the raw water is passed through the line carbon filter and polyamide composite membrane Almost eliminated, the antibacterial rate of produced water was low at 53.13%.

4. Permeate Flow Measurement

The reverse osmosis water purifiers configured in Examples 1 and 2 and Comparative Examples 2 and 3 were operated at a pressure of 38 ± 2 psi using tap water having a concentration of 0.5 ppm and a conductivity of 250 ± 5 uS / cm at room temperature. . The run was repeated for 12 hours, then stopped for 12 hours and operated for 60 days. Finally, the permeate flow rate of the tap water was measured and the results are shown in Table 4 below.

division Initial transmission flow rate Permeate flow after 60 days Example 1 11.0 GFD 10.5 GFD Example 2 11.1 GFD 10.7 GFD Comparative Example 2  4.2 GFD 12.6 GFD Comparative Example 3  4.1 GFD  4.0 GFD

According to the results of Table 4, Examples 1 and 2 are 11.0 GFD and 11.1GFD, respectively, the initial permeate flow rate is 2 times higher than Comparative Examples 2 and 3, respectively, and shows a stable performance without changing the permeate flow rate even after 60 days. Keeping up.

On the other hand, in Comparative Example 2 in which a conventional polyamide composite membrane was applied without a sun carbon filter, the initial permeate flow rate was low at 4.2GFD, and in Comparative Example 3 in which the boost pump was excluded from the conventional reverse osmosis water purifier, the permeate flow rate of 4.1GFD was obtained. Indicated.

The difference in the permeate flow rate is caused by the applied polyamide composite membrane, and the polyamide composite membrane used in Comparative Examples 2 and 3 has a small permeate flow rate and is required to have a boost pump when applied to a reverse osmosis water purifier to improve pressure. However, in the chlorine resistant polyamide composite membrane used in Examples 1 and 2, since the permeate flow rate is sufficient even by the water pressure, the boost pump may be omitted when the reverse osmosis water purifier is applied, thereby reducing operating costs.

As described above, the present invention

First, in the configuration of the reverse osmosis water purifier, the sun carbon filter is omitted, and the composition consisting of the precipitation filter, the chlorine resistant polyamide composite membrane, and the post carbon filter is applied to a simple filter part, and compared with a conventional water filter composed of a typical four-stage filter. It is possible to provide a slimmer reverse osmosis water purifier.

Second, by applying a polyamide composite membrane having excellent chlorine resistance in the configuration of the reverse osmosis water purifier, it is possible to provide a reverse osmosis water purifier having a longer filter life than when applying a general polyamide composite membrane having no chlorine resistance.

Third, in the composition of the reverse osmosis water purifier, the chlorine-resistant polyamide composite membrane passes a trace amount of residual chlorine component to the rear end, so that a small amount of chlorine is contained in the after carbon filter or the purified water storage tank, so that the survival of microorganisms or viruses is suppressed. As a good integer can be provided.

Although the present invention has been described in detail only with respect to the embodiments described, it will be apparent to those skilled in the art that various modifications and variations are possible within the technical scope of the present invention, and such modifications and modifications belong to the appended claims.

1 is a schematic diagram of an embodiment of the present invention consisting of a precipitation filter, a chlorine resistant polyamide composite membrane, a fucarbon filter and a purified water storage tank,

2 is a schematic diagram of another embodiment of the present invention consisting of a precipitation filter, a chlorine resistant polyamide composite membrane, a purified water storage tank and a fucarbon filter,

3 is a schematic diagram of a conventional reverse osmosis water purifier.

<Code Description of Main Parts of Drawing>

1 : Intake valve

2 : settling filter

3 : Chlorinated Polyamide Composite Membrane

4 : fucarbon filter

5 : water purification valve

6 : wastewater pipe

7 : water purification tank

8 : boosting pump

9 : sun carbon filter

10 : polyamide composite membrane

Claims (7)

In the reverse osmosis water purifier consisting of the filter portion of the sedimentation filter, sun carbon filter, polyamide composite membrane and after carbon filter, The chlorine-resistant polyamide composite membrane which does not require the sun carbon filter is provided by simultaneously performing the function of removing the residual chlorine and the polyamide composite membrane of the sun carbon filter, thereby simplifying the construction of the filter unit from which the sun carbon filter is removed. Osmosis water purifier. According to claim 1, wherein the reverse osmosis water purifier A filter unit comprising a precipitation filter, a chlorine resistant polyamide composite membrane, and a fucarbon filter; And The reverse osmosis water purifier, characterized in that the storage consisting of a purified water storage tank sequentially connected. According to claim 1, wherein the reverse osmosis water purifier The reverse osmosis, characterized in that the storage unit consisting of a purified water storage tank is provided between the filter unit consisting of a precipitation filter, a chlorine-resistant polyamide composite membrane and a fucarbon filter, and the chlorine-resistant polyamide composite membrane and the fucarbon filter water purifier. The reverse osmosis water purifier according to claim 1, wherein the chlorine resistant polyamide composite membrane is an alkylated polyamide composite membrane. According to claim 1, wherein the chlorine resistant polyamide composite membrane The reverse osmosis water purifier, characterized in that chlorine durability is maintained to maintain at least 85% salt removal performance when passing through a sodium hypochlorite (NaOCl) solution of 500 to 2,000ppm concentration for 1 to 24 hours. The reverse osmosis water purifier according to claim 1, wherein when the chlorine resistant polyamide composite membrane passes a 250 ppm sodium chloride (NaCl) solution at 60 psi pressure, the permeate flow rate is 10 GFD or more. The reverse osmosis water purifier of claim 1, wherein the chlorine resistant polyamide composite membrane transmits 20% or more of residual chlorine in raw water.

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