KR20190061523A - capacitive deionization system for concentrated water saving type - Google Patents

Abstract

The present invention relates to a concentrated water reduction-type electrosorptive desalination system which is capable of innovatively reducing generation amount of concentrated water of an entire system by removing external discharge of high concentration ion concentrated water discharged from a CDI treatment unit through convergence of a CDI (Capacitive Deionization) technology and an ED (Electro Dialysis) technology, and finally discharging only ED concentrated water which comes close to a limit saturation concentration after being repeatedly concentrated in an ED treatment unit. Specifically, the concentrated water reduction-type electrosorptive desalination system includes: the CDI treatment unit which includes one or more CDI modules formed by stacking a pluralities of positive electrodes and negative electrodes at predetermined intervals, and repeatedly performs a process of adsorbing ions existing in inflow water flowing between the positive electrodes and the negative electrodes and discharging the adsorbed ions and a regeneration process of desorbing ions adsorbed onto the positive electrodes and the negative electrodes; and the ED treatment unit which recovers CDI concentrated water discharged during the process of regenerating the electrodes by desorbing the ions in the CDI treatment unit, and separates the ions from the CDI concentrated water through an electrodialysis method.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a concentrated water-

The present invention eliminates the external discharge of high concentration ion-rich water discharged from the CDI processing unit through the fusion of CDI (Capacitive Deionization) technology and ED (Electro Dialysis) technology, and it is repeatedly concentrated in the ED processing section, To a concentrated water-reduced electroadsor desalination system capable of dramatically reducing the amount of concentrated water generated in the entire system.

Interest in water reuse is increasing day by day due to the shortage of available water resources, which is becoming increasingly serious both domestically and internationally.

The most representative method in the reuse and recycling industry of available water resources is to treat waste water from wastewater treatment plants and reuse them. This is because, unlike other water resources, the discharge water of the wastewater treatment plant is relatively constant in the discharge concentration and the amount of generated water is attracting attention as the most suitable water resource to be reused through the subsequent treatment process.

Therefore, it is an urgent necessity to open an economical and effective water treatment process for treating effluent generated in a wastewater treatment plant and reusing it as industrial water.

On the other hand, the most common water treatment station applied to the domestic and wastewater treatment plants is the MBR process which combines the bioreactor and the membrane process to meet the SBR, A2O process using bioreactor and recent enhanced effluent quality standards. Released water quality standard

The most common process applied to domestic sewage and wastewater treatment plants is the MBR process, which combines bioreactor and separation membrane processes to meet SBR and A2O processes using basically bioreactors and recently enhanced effluent quality standards. The data on the discharge water quality standards of BOD, COD, SS, TN, TP, E. coli and ecotoxicity are regulated mainly by the regional regulation differences as shown in Tables 1 and 2. However, unlike general wastewater, industrial wastewater contains various refractory materials and oils (Fat, Oil, Grease etc.) and a large amount of inorganic salts (TDS) depending on the wastewater generation industry and manufacturing process. Therefore, in order to reuse wastewater discharged from wastewater treatment plants as industrial wastewater, integrated water treatment process technology combining a variety of separate unit process technologies in accordance with the use purpose (use) of industrial wastewater as well as discharged water quality standards is required.

In order to utilize the final effluent of industrial wastewater treatment plants for industrial wastewater treatment, TOC (Total Organic Carbon) and TDS (Total Dissolved Solid), which are basically BOD, COD, SS, TN, TP, ), Suspended Solid (SS) and Oils, and there is a need for an effective combination of optimal unit process technologies for this.

Accordingly, it is possible to combine the existing technologies that have been most widely used in actual industrial sites and proven effects and the newly developed accumulation electrodischarge desalination technologies, and treat effluent discharged from the sewage and wastewater treatment plants to the industrial water quality level On the other hand, there is a demand for an integrated water treatment process technique capable of reducing the amount of high concentration of ion-enriched water discharged during the treatment process.

Korean Patent Publication No. 10-2015-0085983 (July 27, 2015)

Accordingly, it is an object of the present invention to provide a CDI (Capacitive Deionization) technology capable of reducing the amount of ion-concentrated water generated in the entire system while preventing the discharge of high concentration ion- And to provide an electrodeposited desalination system.

The concentrated water-reduced electrodischarge desalination system according to the present invention includes at least one CDI module in which a plurality of positive electrodes and negative electrode are stacked at a predetermined interval, and the inflow water flowing between the positive electrode and the negative electrode A CDI processing unit repeatedly performing a process of adsorbing and discharging existing ions and a regeneration process of desorbing ions adsorbed to the positive electrode and the negative electrode; And an ED processing unit for recovering the CDI concentrated water discharged during the process of desorbing ions from the CDI processing unit and regenerating the electrode and separating the ions from the CDI concentrated water through an electrodialysis method, to be.

As one example, the ED processing unit may include an inlet / treatment water tank connected to the CDI processing unit through the inflow line, the CDI concentrated water discharged during the regeneration process of the CDI processing unit is selectively introduced, and the inflow / ; And at least one dilution chamber in which ions are removed from the CDI concentrated water and a concentrate chamber in which ions are separated and collected, which are interconnected through the inflow / treatment water tank and the first circulation line, An ED module for separating and discharging the ED concentrated water of the concentrating chamber; And an ED process module mounted on the first circulation line and being operated by an external control signal to receive ED treatment water accommodated in the inflow / treatment water tank through CDI concentrated water or one or more cycles circulated for the first time in the inflow / And a first circulation pump for circulating the ED treatment water discharged from the dilution chamber of the ED module to be recovered to the inflow / treatment water tank.

As one example, the ED processing unit may include: a regenerated water supply line for communicating the inflow / treatment water tank and the inflow side of the CDI processing unit; And a replenishment water supply pump installed in the replenish water supply line and operated by an external control signal to selectively supply the ED treated water accommodated in the inflow / treatment water tank to the inflow side of the CDI processing unit .

As one example, the ED processing unit may operate the first circulation pump during the time for adsorbing ions of the CDI processing unit to circulate the CDI concentrated water contained in the inflow / treatment water tank at least one time, Ions in the inflowing / processing water tank; and controlling the CDI processing unit to operate the regenerating water supply pump in the regeneration process of the CDI processing unit, so that the ED treatment water accommodated in the inflow / And a control unit for controlling the process of supplying the regenerated water to be used as a regeneration water in the regeneration process of the regeneration regeneration unit.

As one example, the ED processing unit is connected to the ED module through the second circulation line, and receives the ED concentrated water discharged from the concentration chamber of the ED module and selectively receives the ED concentrated water while receiving the introduced ED concentrated water. A concentrated water tank for discharging the water; And a second circulation pump installed in the second circulation line and operated by an external control signal to circulate the ED concentrated water accommodated in the concentrated water tank so as to pass through the ED module. In this case, Wherein the second circulation pump is operated to circulate and concentrate the ED concentrated water contained in the concentrated water tank one or more times to accumulate the ionized water, wherein the ion concentration sensor is mounted in the concentrated water tank, The operation of the second circulation pump is stopped and the ED concentrated water accommodated in the concentrated water tank can be controlled to be discharged when the concentration is close to the preset limit saturated concentration.

INDUSTRIAL APPLICABILITY As described above, the concentrated water-reduced electrodialysis desalination system of the present invention eliminates the external discharge of high concentration ion-rich water discharged from the CDI processing unit through the fusion of CDI (Capacitive Deionization) technology and ED (Electro Dialysis) And the ED concentrator is repeatedly concentrated so that only the ED concentrator close to the limit saturation concentration is finally discharged, thereby remarkably reducing the amount of concentrated water generated in the entire system.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a configuration of a concentrated water-reduced electrodialysis desalination system according to an embodiment of the present invention; FIG.
2 is a block diagram illustrating a configuration of a CDI processing unit and an ED processing unit according to an embodiment of the present invention;
3 is a schematic diagram showing an operating state of an ED module according to an embodiment of the present invention;

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

FIG. 1 is a block diagram showing a configuration of a concentrated water reducing electrodialysis desalination system according to an embodiment of the present invention, FIG. 2 is a block diagram showing the configuration of a CDI processing unit and an ED processing unit according to an embodiment of the present invention And FIG. 3 is a schematic diagram showing an operating state of the ED module according to an embodiment of the present invention.

1, a condensed water reduction type electro-adsorption desalination system (hereinafter referred to as a "system of the present invention") of the present invention comprises a CDI (Capacitive Deionization) processing unit 10 and an ED (Electro Dialysis) processing unit 20, And an ultraviolet ray (UV) processing unit 30.

The CDI processing unit 10 includes at least one CDI module 100, which is not shown in the drawing, but has a plurality of positive electrodes and negative electrodes laminated at a predetermined interval, And a regeneration process of desorbing the ionic material adsorbed to the positive electrode and the negative electrode is repeatedly performed.

For example, the CDI processing unit 10 may further include a power supply module for supplying power to each CDI module 100 in addition to the CDI module 100, The adsorption process and the desorption process of ions can be selectively and repeatedly carried out in the positive electrode and the negative electrode of the CDI module 100 and the CDI treatment water discharged through the adsorption process and the CDI concentrated water discharged through the desorption process can be separated So that it can be discharged.

The CDI processing unit 10 is a desalination technology for removing TDS (Total Dissolved Solid) and ionic inorganic pollutants present in the influent water by an electro-absorption method using an electric field principle. At this time, May be a process number that has undergone a preprocessing process.

For example, the pretreatment process uses oil (fat, oil, grease, etc.), particulate SS (suspended solid) DAF (Dissolved Air DOT (Dissolved Air Flotation) process, which removes organic materials, and TOC (Total Organic Carbon), which is a soluble organic material, and ACF Activated carbon filter) and MF (micro filtration) process for separating particulate solid matter remaining in the treated water through the DAF process and ACF process using a membrane having a pore size of 1 μm or less, or a combination of two or more Lt; / RTI >

Meanwhile, the ED processing unit 20 recovers the CDI concentrated water discharged during the regeneration process in which the ions are desorbed from the CDI processing unit 10 to regenerate the electrodes, and the CDI concentrated water recovered through electrodialysis And separates and discharges the ED treated water in which the ions are separated and the ED concentrated water in which ions are more concentrated in the process.

1, the ED processing unit 20 supplies the ED-treated water in which ions have been separated and processed to the CDI processing unit 10 so as to be utilized as a regeneration water in the regeneration process of the CDI module 100 .

The ED processing unit 20 may include an inlet / treatment water tank 210, an ED module 200, and a first circulation pump 255 as shown in FIG.

First, the inflow / treatment water tank 210 selectively receives the CDI concentrated water discharged from the CDI processing unit 10 or the ED process processed in the circulation process of the ED module 200 described below .

That is, the inflow / treatment water tank 210 is connected to the CDI processing unit 10 through the inflow line 240, and the CDI concentrated water discharged during the regeneration process of the CDI processing unit 10 is selectively introduced, CDI concentrate.

The ED module 200 is connected to the inflow / treatment water tank 210 through the first circulation line 250. The ED module 200 is connected to the dilution chamber 205 through which ions are removed from the CDI- And the ED concentrated water in the dilution chamber 205 and the ED concentrated water in the concentration chamber 206 are separately discharged.

The first circulation pump 255 is connected to the first circulation line 250 and is operated by an external control signal to circulate the CDI concentrated water or the first circulation which is first accommodated in the inflow / The ED treatment water accommodated in the inflow / treatment water tank 210 is introduced into the ED module 200 and the ED treatment water discharged from the dilution chamber 205 of the ED module 200 is introduced into the inflow / 210).

3, the ED module 200 includes a positive electrode 201 and a negative electrode 202 disposed on one side and the other side, respectively, and an anion exchange membrane 203 through which only negative ions are permeated, The dilution chamber 205 and the concentration chamber 206 are alternately formed between the anion exchange membrane 203 and the cation exchange membrane 204. The dilution chamber 205 and the concentration exchange chamber 206 are alternately arranged.

To briefly explain the operation of the ED module 200, when the DCI voltage applied from the outside is supplied to the positive electrode 201 and the negative electrode 202 and the CDI concentrated water accommodated in the inflow / treatment water tank 210 is circulated , The CDI concentrated water flows into the dilution chamber 205 and the concentration chamber 206 of the ED module 200 and the positive ions in the ions present in the CDI concentrated water move toward the negative electrode 202, (201).

At this time, the positive ions pass through the cation exchange membrane 204 while moving toward the negative electrode 201, but remain in the concentration chamber 206 because they can not pass through the anion exchange membrane 203. Conversely, in the case of negative ions, The cation exchange membrane 204 does not pass through the anion exchange membrane 203 but remains in the concentration chamber 206. As a result, in the concentration chamber 206, positive ions and anions are continuously accumulated to cause concentration, In the chamber 205, the positive ions and the negative ions continuously escape, thereby desalting the CDI concentrated water.

The desalted ED treated water can then be reintroduced into the inflow / treatment water tank 210 during the circulation process, and the ED concentrated water concentrated and concentrated can be accommodated in the agricultural harvesting tank 220 described below.

As described above, according to the system of the present invention, the ionic contaminants in the water are removed by the electrical adsorption of dissolved cations and anions using the attractive force of the electric field in the CDI processing unit 10, so that the risk of contamination with organic substances is relatively low, Can be effectively regenerated through short-circuiting or inversion of the electrode-supplying potential, so that the regeneration waste liquid is hardly generated and thus the environment-friendliness is very high.

In particular, by combining ED (Electro Dialysis) technology using the principle of electric fields similar to the CDI technology applied in the CDI processing unit 10, the high recovery rate of the CDI process is further enhanced, and the CDI processing unit 10 as well as the concentrated water generation amount To be reduced dramatically.

In addition, the ED processing unit 20 may further include a replenishing water supply line 260 and a feed pump 265 as shown in FIG.

The replenishment water supply line 260 is disposed so as to communicate the inflow / treatment water tank 210 and the inflow side of the CDI processing unit 20.

The regeneration water supply pump 265 is installed in the regeneration water supply line 260 and is operated by an external control signal to selectively supply ED treatment water accommodated in the inflow water treatment tank 210 to the CDI processing unit 20 So that it can flow through the inflow side.

The ED processing unit 20 may further include a control unit not shown in the figure, and the control unit operates the first circulation pump 255 during the time for adsorbing ions of the CDI processing unit 20 A process of circulating the CDI concentrated water accommodated in the inflow / treatment water tank 210 more than once to allow the ED treatment process in which ions have been separated through the ED module 200 to be accommodated in the inflow / treatment water tank 210 The CDI processing unit 10 operates the regeneration water supply pump 265 to regenerate ED treatment water accommodated in the inflow water treatment tank 210 as regeneration water in the regeneration process of the CDI processing unit 10 So as to be repeatedly performed.

That is, in the system of the present invention, it is possible to eliminate the external discharge of the concentrated ion-rich water discharged from the CDI processing unit 10 through the combined process of the CDI processing unit 10 and the ED processing unit 20. [

In addition, the ED module 200 is repeatedly concentrated to discharge only a part of the ED concentrated water near the critical saturation concentration, thereby reducing the concentration of water in the entire system to 10% or less .

For this, the ED processing unit 20 may further include a concentrated water tank 220 and a second circulation pump 275 as shown in FIG.

The concentrated water tank 220 is connected to the ED module 200 through the second circulation line 270 and the ED concentrated water discharged from the concentration chamber 206 of the ED module 200 flows into the ED And selectively discharges the concentrated water through the discharge line 280 while receiving it.

The second circulation pump 275 is connected to the second circulation line 270 and is operated by an external control signal to circulate the ED concentrated water accommodated in the concentrated water tank 220 through the ED module 200 .

The control unit operates the second circulation pump 275 to circulate the ED concentrated water stored in the concentrated water tank 220 one or more times to cumulatively concentrate the accumulated water. However, in the concentrated water tank 220, And the second circulation pump 275 is stopped when the concentration of ions measured by the ion concentration sensor approaches a predetermined saturation concentration, and the concentration of the ions contained in the concentrated water tank 220 It is possible to control the cumulative concentrated ED concentrated water to be finally discharged.

Finally, the ED processing unit 20 may further include an electrolyte tank 230 communicating with the ED module 200 through a circulation line and containing an electrolyte solution serving as a medium for ion conduction, The tank 230 is disposed on both sides of the ED module 200 to supply the electrolytic solution accommodated in the electrode chamber constituting the positive electrode 201 and the negative electrode 202. A circulation pump is provided in the circulation line, So that the electrolytic solution can be recovered from the electrode chamber and supplied again.

In the system of the present invention, the power supply means for the CDI module 100 using the low voltage and high current and the power supply means for the ED module 200 using the high voltage are not separately configured, If the voltage supplied to the CDI processing unit 10 is increased and the amount of current is lowered, the ED module 200 using the high voltage and the single power supply unit are operated to ensure the convenience of the system configuration.

For example, in order to operate the ED module 200 of 50V / 20A, if a CDI module 100 of 1.0V / 200A is 50 SET serialized to 50V / 4A, a CDI processing unit 10 And the ED module 200 can be operated together.

Meanwhile, the UV treatment unit 30 irradiates the CDI treatment water discharged from the CDI treatment unit 10 with ultraviolet light to sterilize and discharge the microorganisms.

In other words, the UV treatment unit 30 can remove E. coli, microorganisms, and the like present in the final treated water from which TOC, SS, and TDS have been removed through the pre-treatment process and the fusion process of the CDI treatment unit 10 and the ED treatment unit 20 Disinfection after sterilization / disinfection with ultraviolet rays. At this time, the UV wavelength region can use a 230 nm region band known to have strong sterilizing power.

As described above, the system of the present invention meets the minimum processing performance required for discharged water reuse, and can be used as general industrial water such as cooling water replenishing water or washing water, and can be used for advanced industrial oxidation (AOP: Advanced Oxidation Process), or RO, EDI, IEX process, etc., to be used as pure water or ultra pure water.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be defined by the claims.

10: CDI processing section 20: ED processing section
30: UV processor 100: CDI module
200: ED module 201: positive polarity
202: negative electrode 203: negative ion exchange membrane
204: Cation exchange membrane 205: Dilution chamber
206: concentration chamber 210: inflow / treatment water tank
220: concentrated water tank 230: electrolyte tank
240: inflow line 250: first circulation line
255: first circulation pump 260: replenish water supply line
265: replenishment water supply pump 270: second circulation line
275: second circulation pump 280: discharge line
290: Electrolytic solution circulation line

Claims (5)

The method includes the steps of: one or more CDI modules having a plurality of positive electrodes and negative electrodes stacked at a predetermined interval and adsorbing and discharging ions present in the inflow water flowing between the positive electrode and the negative electrode; A CDI processing unit for repeatedly performing a detaching and regenerating process; And
And an ED processing unit for recovering the CDI concentrated water discharged during the process of desorbing ions from the CDI processing unit and regenerating the electrode and separating the ions from the CDI concentrated water through an electrodialysis method Which is a concentrated water reducing type electro-adsorptive desalination system.
The method according to claim 1,
The ED processing unit,
An inflow / treatment water tank connected to the CDI processing unit through the inflow line and selectively inflowing the CDI concentrated water discharged during the regeneration process of the CDI processing unit and accommodating the inflowed CDI concentrated water;
And at least one dilution chamber in which ions are removed from the CDI concentrated water and a concentrate chamber in which ions are separated and collected, which are interconnected through the inflow / treatment water tank and the first circulation line, An ED module for separating and discharging the ED concentrated water of the concentrating chamber; And
Treatment water tank, which is mounted on the first circulation line and is operated by an external control signal and is CDI concentrated water initially accommodated in the inflow / treatment water tank or circulated one or more times, And a first circulation pump for circulating the ED treatment water discharged from the dilution chamber of the ED module to be recovered to the inflow / treatment water tank.
3. The method of claim 2,
The ED processing unit,
A regenerated water supply line for communicating the inflow / treatment water tank and the inflow side of the CDI processing unit; And
And a replenishment water supply pump installed in the replenish water supply line and operated by an external control signal to selectively supply the ED treated water accommodated in the inflow / treatment water tank to the inflow side of the CDI processing unit. Which is a concentrated water reducing type electro-adsorptive desalination system.
The method of claim 3,
The ED processing unit,
The first circulation pump is operated during the time for adsorbing the ions of the CDI processing unit to circulate the CDI concentrated water accommodated in the inflow / treatment water tank at least once, so that the ED treatment water, in which ions are separated through the ED module, / Treatment water tank, and the regenerated water supply pump is operated in the regeneration process of the CDI treatment unit to supply ED treatment water accommodated in the inflow / treatment water tank to be used as regeneration water in the regeneration process of the CDI treatment unit And a control unit for controlling the operation of the desulfurization unit so that the process is repeatedly performed.
5. The method of claim 4,
The ED processing unit,
A concentrated water tank which is connected to the ED module through a second circulation line and receives the ED concentrated water discharged from the concentration chamber of the ED module and discharges the ED concentrated water selectively through the discharge line;
And a second circulation pump mounted on the second circulation line and operated by an external control signal to circulate the ED concentrated water accommodated in the concentrated water tank so as to pass through the ED module,
Wherein,
And an ion concentration sensor installed in the concentrated water tank for circulating and accumulating the ED concentrated water accommodated in the concentrated water tank by operating the second circulation pump at least once, Wherein the control unit stops the operation of the second circulation pump and controls the ED concentrated water accommodated in the concentrated water tank to be discharged when the preset concentration reaches a predetermined limit saturation concentration.

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