KR20210111121A - Pre-treatment system for manufacturing disinfectant - Google Patents

Abstract

Disclosed is a pretreatment system for manufacturing disinfectants to minimize pretreatment cost and generation of by-products. According to the present invention, the pretreatment system comprises: a pressurized membrane process unit producing brine from supplied influent; a high-concentration brine storage unit storing the brine produced from the pressurized membrane process unit; an ion concentration difference process unit diluting the brine supplied from the high-concentration brine storage unit through a non-pressurized ion concentration difference process; a diluted brine storage unit storing the diluted brine produced from the ion concentration difference processing unit; and an electrolysis unit receiving the diluted brine stored in the diluted brine storage unit and the brine produced from the pressurized membrane process unit to produce chlorine gas and a sodium hydroxide solution through a diaphragm electrolysis process.

Description

PRE-TREATMENT SYSTEM FOR MANUFACTURING DISINFECTANT

The present invention relates to a pretreatment system for disinfectant production, and more particularly, as a system for pretreatment of a diaphragm-type electrolysis process for disinfectant production, a fusion of an ion concentration difference separation membrane process and a surface-modified activated carbon process capable of selective treatment of by-products It relates to a pretreatment system for disinfectant production that can minimize pretreatment costs and by-products by introducing a brine recirculation process, and reuse brine in the process.

In the conventional case, in operating a production process for producing sodium hypochlorite, a disinfectant, on site, the efficiency of the diaphragm-type electrolysis cell used in the diaphragm-type electrolysis process is increased and the generation of electrolysis by-products generated during the process is minimized In order to do this, a method was used in which contaminants and by-product precursors contained in the influent used to dissolve salt were removed through a pressurized membrane process, and then refined salt or rock salt was added.

However, in the case of the pressurized membrane process, since it is operated at a pressure of 2 to 17 bar depending on the concentration of the influent, there is a problem in reducing the economic feasibility of the disinfectant production process for on-site manufacturing and reducing the efficiency of the entire process in terms of continuous operation and management.

In addition, since refined salt or rock salt added to the anode of the diaphragm electrolysis cell for chlorine gas production contains bromine ions, the anode of the diaphragm electrolysis cell contains chlorate and toxic by-products due to salt and bromine ions. Bromate is generated, and chlorate and bromate are regulated at 0.7 mg/L and 0.01 mg/L, respectively, which are acceptable drinking water standards.

Therefore, a post-treatment process is necessarily required in the conventional disinfectant production process for on-site manufacturing, and there is a problem in that the production cost increases due to the addition of the post-treatment process.

The background technology of the present invention is disclosed in Korean Patent Publication No. 10-0874269 (registered on December 09, 2008, title of invention: high-efficiency seawater electrolysis apparatus and electrolysis method including pretreatment process).

The present invention was created to improve the above problems, and an object of the present invention is a system for pretreatment of a diaphragm-type electrolysis process for the production of a disinfectant, and a surface modification capable of selectively treating an ion concentration difference membrane process and by-products It is to fuse the activated carbon process, to introduce a brine recycling process, to minimize the pretreatment cost and the generation of by-products, and to provide a pretreatment system for disinfectant production that can reuse the brine in the process.

The pretreatment system for producing a disinfectant according to the present invention includes: a pressurized membrane process unit for producing brine from the supplied influent, a high brine storage unit for storing the brine produced from the pressurized membrane process unit, and brine supplied from the high brine storage unit An ion concentration difference processing unit for diluting the ions through a non-pressurized ion concentration difference process; It is characterized in that it includes an electrolysis process unit for receiving each of the brine produced from the separation membrane process unit to produce chlorine gas and sodium hydroxide solution through a diaphragm electrolysis process.

In addition, a contaminant removal process unit for removing bromine ions present in the diluted brine is further disposed between the diluted brine storage unit and the electrolysis process unit.

In addition, the contaminant removal process unit is characterized in that it adsorbs and removes bromine ions by using the first adsorption unit surface-modified with a material capable of chemical bonding with bromine ions.

In addition, the first adsorption unit is characterized in that it includes activated carbon surface-modified with silver halide.

In addition, it characterized in that it further comprises a treated water recirculation unit for recycling the treated water generated in the diaphragm electrolysis process of the electrolysis process unit to the contaminant removal process unit.

In addition, the pollutant removal process unit adsorbs and removes chlorates and bromates using the second adsorption unit surface-modified with a material capable of chemical bonding with chlorates and bromates present in the treated water supplied through the treated water recirculation unit. characterized in that

In addition, the second adsorption unit is characterized in that it includes activated carbon surface-modified with iron (III) chloride or CTAC (cetyl trimethylammonium chloride).

Since the pretreatment system for producing a disinfectant according to the present invention uses a non-pressurized ion concentration difference membrane process in diluting brine, energy consumption is reduced and economic feasibility can be secured.

In addition, the pretreatment system for producing a disinfectant according to the present invention uses activated carbon modified with silver chloride or the like to remove bromate ions, which are precursors of bromate, so that bromate generation in the diaphragm type electrolysis cell can be suppressed.

In addition, the pretreatment system for producing a disinfectant according to the present invention removes chlorate and bromate contained in the treated water generated in the electrolysis cell using activated carbon modified with iron (III) chloride, cetyl trimethylammonium chloride (CTAC), etc. Therefore, the treated water can be reused in the diaphragm-type electrolysis process.

1 is a view schematically showing a pretreatment system for producing a disinfectant according to an embodiment of the present invention.
2 is a view showing a process flow of a pretreatment system for producing a disinfectant according to an embodiment of the present invention.

Hereinafter, a pretreatment system for producing a disinfectant according to an embodiment of the present invention will be described with reference to the accompanying drawings. In this process, the thickness of the lines or the size of the components shown in the drawings may be exaggerated for clarity and convenience of explanation.

In addition, the terms described below are terms defined in consideration of functions in the present invention, which may vary according to the intention or custom of the user or operator. Therefore, definitions of these terms should be made based on the content throughout this specification.

1 is a view schematically showing a pretreatment system for disinfectant production according to an embodiment of the present invention, and FIG. 2 is a view showing a process flow of the pretreatment system for disinfectant production according to an embodiment of the present invention.

1 to 2, the pretreatment system for producing a disinfectant according to an embodiment of the present invention includes a pressurized membrane process unit 100 for producing high-concentration brine from the supplied influent 10, and a pressurized membrane process unit ( A high brine storage unit 200 for storing the high concentration brine produced from 100), and an ion concentration difference process unit ( 300), a diluted brine storage unit 400 for storing the diluted brine produced from the ion concentration difference processing unit 300, the diluted brine stored in the diluted brine storage unit 400, and a pressurized separation membrane processing unit 100 ) and an electrolysis process unit 500 for producing chlorine gas and sodium hydroxide solution through a diaphragm electrolysis process by receiving each of the high-concentration brine produced from, a diluted brine storage unit 400 and an electrolysis process unit Between 500 , a contaminant removal process unit 600 for removing bromine ions present in the diluted brine may be further disposed.

In order to supply the influent 10 taken from the river or the sea to the pressurized separation membrane processing unit 100 , a first pipe 11 for transporting the influent 10 is connected to the pressurized separation membrane processing unit 100 , and the first A first pump 12 is installed in the pipe 11 .

The ion concentration difference processing unit 300 is connected to a second pipe 13 branching from the first pipe 11 and directly transferring the influent 10 to the ion concentration difference processing unit 300 , and the second pipe 13 ), the second pump 14 is installed.

A third pipe 15 for transferring the high-concentration brine produced from the pressurized membrane process unit 100 is connected to the pressurized membrane process unit 100 , and the third pipe 15 is connected to the high-salt water storage unit 200 . Connected.

A fourth pipe 16 for directly transferring the high-concentration brine produced from the pressurized membrane process unit 100 to the electrolysis process unit 500 is connected to the pressurized membrane process unit 100, and the fourth pipe 16 is connected to the electrolysis process unit 500 .

A fifth pipe 17 for discharging the generated concentrated water is connected to the pressurized membrane process unit 100 .

A sixth pipe 18 for transferring high-concentration brine to the ion concentration difference processing unit 300 is connected to the high salt water storage unit 200 , and the sixth pipe 18 is connected to the ion concentration difference processing unit 300 . connected A third pump 19 is installed in the sixth pipe 18 .

A seventh pipe 20 for transferring the brine diluted in the ion concentration difference process unit 300 is connected to the ion concentration difference processing unit 300 , and the seventh pipe 20 is connected to the diluted brine storage unit 400 . Connected.

An eighth pipe 21 for discharging the generated treated water is connected to the ion concentration difference processing unit 300 .

A ninth pipe 22 for transferring the diluted brine to the pollutant removal process unit 600 is connected to the diluted brine storage unit 400 , and the ninth pipe 22 is connected to the pollutant removal process unit 600 . Connected.

A tenth pipe 23 for transferring the brine from which pollutants are removed to the electrolysis process unit 500 is connected to the pollutant removal process unit 600 , and the tenth pipe 23 is connected to the electrolysis process unit 500 . ) is connected to

The pollutant removal process unit 600 includes a first adsorption unit 610 surface-modified with a material capable of chemical bonding with bromine ions, and the pollutant removal process unit 600 uses the first adsorption unit 610 . It adsorbs and removes bromine ions.

The first adsorption unit 610 preferably includes activated carbon surface-modified with silver halide, and silver chloride (AgCl) may be used as the silver halide (Ag) used for surface modification of the first adsorption unit 610 .

The electrolysis process unit 500 includes a cathode cell 510 and an anode cell 520 , and one side of the electrolysis process unit 500 has an eleventh eleventh for discharging chlorine gas produced through a diaphragm electrolysis process. The pipe 24 is connected, and a twelfth pipe 25 for transferring the sodium hydroxide solution produced through the diaphragm electrolysis process to the subsequent process is connected to the other side of the electrolysis process unit 500 .

The electrolysis process unit 500 may further include a treated water recirculation unit for recycling the treated water generated in the diaphragm electrolysis process to the pollutant removal process unit 600 .

The treated water recirculation unit includes a thirteenth pipe 26 connecting the electrolysis process unit 500 and the pollutant removal process unit 600 , and a fourth pump 27 installed in the thirteenth pipe 26 .

The pollutant removal process unit 600 further includes a second adsorption unit 620 whose surface is modified with a material capable of chemical bonding with chlorate and bromate present in the treated water supplied through the treated water recirculation unit. In the material removal process unit 600 , the chlorate and bromate are adsorbed and removed using the second adsorption unit 620 .

The second adsorption unit 620 preferably includes activated carbon surface-modified with iron (III) chloride or cetyl trimethylammonium chloride (CTAC).

The flow of the entire process using the pretreatment system for disinfectant production according to an embodiment of the present invention configured as described above will be described with reference to FIGS. 1 and 2 .

In the pressurized membrane process unit 100 that receives the influent 10 taken from the river or sea, the pressurized membrane process (S10) is performed.

A high-concentration brine is produced in the pressurized separation membrane process (S10), and some of the produced high-concentration brine is stored in the high brine storage unit 200 through the high brine storage process (S20), and some is stored in the diaphragm-type electrolysis process (S60) ) is transferred to the electrolysis process unit 500 through the fourth pipe 16 for use.

In the non-pressurized ion concentration difference process (S30), the high-concentration brine supplied through the fifth pipe 17 is used as the draw solution, and the influent 10 supplied through the second pipe 13 is used as the supply solution to provide a high-concentration solution. Dilute the brine 2 to 10 times.

In the non-pressurized ion concentration difference process (S30), contaminants present in the influent 10 may be primarily removed.

The diluted brine produced in the non-pressurized ion concentration difference process (S30) is stored in the diluted brine storage unit 400 through the diluted brine storage process (S40).

In the bromine ion removal process (S50), bromine ions contained in the diluted brine supplied through the ninth pipe 22 are removed. That is, when the diluted brine passes through the first adsorption unit 610 including the activated carbon 611 surface-modified with silver halide such as silver chloride (AgCl), the bromine ions are replaced with chloride ions, and the bromine ions are removed. is made, and the diluted brine from which bromine ions are removed is transferred to the electrolysis process unit 500 .

In the diaphragm-type electrolysis process (S60), the diluted brine from which bromine ions supplied through the tenth pipe 23 are removed and the high-concentration brine supplied from the pressurized membrane process unit 100 through the fourth pipe 16 are mixed. Electrolysis is performed using

Through electrolysis, a sodium hydroxide solution is generated in the cathode cell 510 of the electrolysis process unit 500 , and chlorine gas is generated in the anode cell 520 .

The sodium hydroxide solution and chlorine gas are mixed in a subsequent process and used to produce sodium hypochlorite, a disinfectant.

In the treated water recirculation process (S70), the treated water generated in the anode cell 510 of the electrolysis process unit 500 is transferred using the 13th pipe 26 and the fourth pump 27 constituting the treated water recirculation unit. It is recycled to the pollutant removal process unit 600 .

In the chlorate and bromate removal process ( S80 ), chlorate and bromate included in the treated water of the anode cell 510 of the electrolysis process unit 500 supplied through the treated water recycling process ( S70 ) are removed. That is, the treated water of the anode cell 510 of the electrolysis process unit 500 passes through the second adsorption unit 620 containing the activated carbon 621 surface-modified with iron (III) chloride or CTAC (cetyl trimethylammonium chloride). At this time, chlorate and bromate are removed while being adsorbed by the second adsorption unit 620 , and the treated water of the anode cell 510 of the electrolysis process unit 500 from which chlorate and bromate are removed is electrolyzed again It is transferred to the anode cell 510 of the process unit 500 and reused.

,

As described above, according to the present invention, the ion concentration difference separation membrane process and the surface-modified activated carbon process capable of selective treatment of by-products are fused to the pretreatment process of the diaphragm-type electrolysis process for the production of disinfectants, and the brine recycling process is introduced. In diluting , since a non-pressurized ion concentration difference membrane process is used, energy consumption is reduced and economic feasibility can be secured. In addition, since bromate ion, a precursor of bromate, is removed by using activated carbon modified with silver chloride or the like, bromate generation in the diaphragm type electrolysis cell can be suppressed. In addition, since chlorate and bromate contained in the treated water generated in the electrolysis cell are removed using activated carbon modified with iron (III) chloride, CTAC (cetyl trimethylammonium chloride), etc., the treated water is used in the diaphragm electrolysis process. can be reused.

Although the present invention has been described with reference to the embodiment shown in the drawings, which is merely exemplary, those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. will be. Therefore, the true technical protection scope of the present invention should be defined by the following claims.

100: pressurized membrane process unit 200: high salt water storage unit
300: ion concentration difference process unit 400: diluted brine storage unit
500: electrolysis process unit 600: pollutant removal process unit
10: influent 11: first pipe
12: first pump 13: second pipe
14: second pump 15: third pipe
16: fourth pipe 17: fifth pipe
18: sixth pipe 19: third pump
20: seventh pipe 21: eighth pipe
22: ninth pipe 23: tenth pipe
24: 11th pipe 25: 12th pipe
26: 13th pipe 27: 4th pump

Claims (7)

a pressurized membrane process unit for producing brine from the supplied influent;
a high brine storage unit for storing the brine produced from the pressurized membrane process unit;
an ion concentration difference process unit for diluting the brine supplied from the high salt water storage unit through a non-pressurized ion concentration difference process;
a diluted brine storage unit for storing the diluted brine produced from the ion concentration difference process unit; and
an electrolysis process unit for receiving each of the diluted brine stored in the diluted brine storage unit and the brine produced from the pressurized separation membrane process unit and producing chlorine gas and sodium hydroxide solution through a diaphragm electrolysis process;
Pre-treatment system for disinfectant production comprising a.
The method of claim 1,
A pretreatment system for disinfectant production, characterized in that a contaminant removal process unit for removing bromine ions present in the diluted brine is further disposed between the diluted brine storage unit and the electrolysis process unit.
3. The method of claim 2,
The contaminant removal process unit adsorbs and removes the bromine ions using a first adsorption unit surface-modified with a material capable of chemical bonding with the bromine ions.
4. The method of claim 3,
The first adsorption unit is a pretreatment system for producing a disinfectant, characterized in that it comprises activated carbon surface-modified with silver halide.
5. The method according to any one of claims 2 to 4,
The pretreatment system for disinfectant production, characterized in that it further comprises a treated water recirculation unit for recirculating the treated water generated in the diaphragm electrolysis process of the electrolysis process unit to the pollutant removal process unit.
6. The method of claim 5,
The contaminant removal process unit removes the chlorate and the bromate by using a second adsorption unit surface-modified with a material capable of chemical bonding with chlorate and bromate present in the treated water supplied through the treated water recirculation unit. A pretreatment system for disinfectant production, characterized in that it is removed by adsorption.
7. The method of claim 6,
The second adsorption unit pretreatment system for disinfectant production, characterized in that it comprises activated carbon surface-modified with iron (III) chloride or CTAC (cetyl trimethylammonium chloride).

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