KR20210035466A - Apparatus for treating water using capacitive deionization and control method thereof - Google Patents

Abstract

The present invention provides a capacitive deionized water treatment device that performs a regeneration process according to conductivity while circulating a set amount of purified water in the regeneration process by the capacitive deionization scheme and a method of controlling the same. A capacitive deionized water treatment device according to the present invention includes a CDI module that purifies by removing ions from the influent in the case of a water purification mode by a capacitive deionization scheme, and desorbs and regenerates ions adsorbed to the electrode in a regeneration mode; a purified water supply valve that blocks inflow water and introduces purified water into the CDI module; a concentrated water discharge valve that discharges concentrated wastewater from the CDI module; an electrical conductivity meter that measures electrical conductivity of the treated water treated in the CDI module; and a control unit that operates the purified water supply valve during the regeneration process to supply a set amount of purified water to the CDI module and operates the CDI module in regeneration mode, operates the concentrated water discharge valve based on the electrical conductivity input from the electrical conductivity meter to discharge the treated water, and then switches to the water purification process.

Description

Capacitive deionized water treatment device and its control method {APPARATUS FOR TREATING WATER USING CAPACITIVE DEIONIZATION AND CONTROL METHOD THEREOF}

The present invention relates to a capacitive deionized water treatment apparatus and a control method thereof, and more particularly, to a capacitive deionization method in which a set amount of purified water is circulated in a regeneration process by a capacitive deionization method and a regeneration process is performed according to electrical conductivity. It relates to an ion water treatment apparatus and a control method thereof.

In general, various methods of water treatment devices that treat raw water to generate purified water are currently being researched and developed. Recently, it has been in the spotlight, and in particular, research on the capacitive deionization (CDI) method, which is a capacitive deionization method, has been actively conducted in recent years.

Capacitive deionization devices used in capacitive deionization technology include a positive electrode to which a positive (+) electrode is applied, a negative electrode to which a negative (-) electrode is applied, and a spacer provided between the positive electrode and the negative electrode to allow the treated water to flow. It consists of a capacitive deionized electrode.

Capacitive deionization equipment uses the principle that ions are adsorbed and desorbed from the surface of the electrode by electrical force, and after the ionic filter material is adsorbed and purified, it reaches a saturation state in which the ionic filter material can no longer be adsorbed. Then, a voltage opposite to that of adsorption is applied to each electrode to desorb the ionic filtration materials adsorbed to each electrode, thereby regenerating the electrode.

The background technology of the present invention is disclosed in Korean Patent Publication No. 1965784 (announced on April 5, 2019, a continuous water treatment system using a deionization method).

An object of the present invention according to an aspect of the present invention is to provide a capacitive deionized water treatment apparatus and a control method for performing a regeneration process according to electrical conductivity while circulating a set amount of purified water in a regeneration process by a capacitive deionization method.

The capacitive deionized water treatment device according to an aspect of the present invention is a CDI that removes ions from influent water and purifies it by removing ions from influent water by a capacitive deionization method, and in the regeneration mode, CDI that desorbs and regenerates ions adsorbed on an electrode. module; A purified water supply valve for blocking the inflow water and flowing the purified water into the CDI module; Concentrated water discharge valve for discharging the concentrated waste water from the CDI module; An electric conductivity meter for measuring the electric conductivity of the treated water processed in the CDI module; And in the process of regeneration, the purified water supply valve is operated to supply the set amount of purified water to the CDI module, and the CDI module is operated in the regeneration mode, and then the concentrated water discharge valve is operated based on the electric conductivity input from the electric conduction system to supply the treated water. It characterized in that it comprises a; control unit for switching to the water purification process after discharging.

The present invention further includes a treated water circulator for circulating treated water discharged from the CDI module and flowing into the CDI module, wherein the control unit operates the CDI module in a regeneration mode and then circulates the treated water through the treatment circulator. It is done.

In the present invention, the treated water circulation unit is characterized in that the treated water discharged from the CDI module is blocked and the treated water discharged through the circulation pump is introduced into the CDI module to circulate.

In the present invention, the control unit is characterized in that it switches to the water purification process when the increase change in electrical conductivity is less than or equal to a set value.

In the present invention, the control unit shuts off the purified water supply valve during the water purification process to allow the influent water to flow into the CDI module, and blocks the concentrated water discharge valve so that the treated water flows into the water purification tank, and operates the CDI module in the water purification mode for a set time. It is characterized by letting go.

A method of controlling a capacitive deionized water treatment apparatus according to an aspect of the present invention includes the steps of: a control unit operating a purified water supply valve during a regeneration process to supply a set amount of purified water to a CDI module and operating the CDI module in a regeneration mode; Receiving, by the controller, the CDI module in the regeneration mode and then receiving the electrical conductivity from the electrical conductivity field; And a step of discharging the treated water by operating the concentrated water discharge valve by determining an increase change in the electrical conductivity after receiving the electrical conductivity by the control unit and then converting to a water purification process.

The present invention further comprises a step of circulating the treated water discharged from the CDI module through the treated water circulation unit and introducing the treated water into the CDI module after the control unit operates the CDI module in the regeneration mode.

In the present invention, the step of converting to the water purification process includes: supplying the influent water to the CDI module by shutting off the purified water supply valve by the control unit; Shutting off the concentrated water discharge valve by the control unit to allow the treated water discharged from the CDI module to flow into the purified water tank; And operating the CDI module in the water purification mode for a set time by the control unit.

In accordance with an aspect of the present invention, a storage type deionized water treatment apparatus and a control method thereof are performed by circulating a set amount of purified water in the regeneration process by the storage type deionization method, thereby minimizing the amount of purified water and reducing the amount of concentrated wastewater. Not only can the quantity be reduced, productivity can be improved, but the regeneration process can be performed based on electrical conductivity, thereby optimizing the regeneration time and improving driving efficiency.

1 is a block diagram showing a capacitive deionized water treatment apparatus according to an embodiment of the present invention.
2 is an exemplary view showing a capacitive deionized water treatment apparatus according to an embodiment of the present invention.
3 is a graph showing changes in electrical conductivity according to operating conditions in the capacitive deionized water treatment apparatus according to an embodiment of the present invention.
4 is a flowchart illustrating a control method of a capacitive deionized water treatment apparatus according to an embodiment of the present invention.

Hereinafter, a capacitive deionized water treatment apparatus and a control method thereof according to the present invention will be described with reference to the accompanying drawings. In this process, the thickness of the lines or the size of components shown in the drawings may be exaggerated for clarity and convenience of description. In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to the intention or custom of users or operators. Therefore, definitions of these terms should be made based on the contents throughout the present specification.

1 is a block diagram showing a capacitive deionized water treatment apparatus according to an embodiment of the present invention, FIG. 2 is an exemplary view showing a capacitive deionized water treatment apparatus according to an embodiment of the present invention, and FIG. 3 is It is a graph showing changes in electrical conductivity according to operation conditions in the capacitive deionized water treatment apparatus according to an embodiment of the present invention.

1 to 2, the capacitive deionized water treatment apparatus according to an embodiment of the present invention includes a CDI module 30, a purified water supply valve 40, a concentrated water discharge valve 50, and an electric conduction system. In addition to the 10 and the control unit 20, it may include a treated water circulating unit 60.

The CDI module 30 purifies by removing ions from the influent water in the water purification mode by a capacitive deionization method, and in the regeneration mode, it can regenerate by desorbing ions adsorbed on the electrode.

That is, the CDI module 30 may include a positive electrode to which a positive (+) electrode is applied, a negative electrode to which a negative (-) electrode is applied, and a spacer provided between the positive electrode and the negative electrode so that influent water flows.

Therefore, in the water purification process, as the electrostatic potential is applied, the water purification proceeds using the adsorption reaction of ions by electrical attraction in the electric double layer formed on the electrode surface, and the purified water is discharged to the treated water, and in the regeneration process, OV or reverse potential is applied. As a result, the ions adsorbed on the electrode are desorbed and regeneration proceeds, and concentrated wastewater is discharged to the treated water.

Subsequently, the purified water discharged from the CDI module 30 to the treated water is introduced into the water purification tank 70 and stored, and the concentrated wastewater is introduced into the concentrated wastewater tank through the concentrated water discharge valve 50 and stored.

The purified water supply valve 40 may block inflow water flowing from the inflow water tank to the CDI module 30 and introduce purified water into the CDI module 30.

The concentrated water discharge valve 50 changes the path of the treated water treated in the CDI module 30 so that it flows to the purified water tank 70 in the water purification process, and shuts it off during the regeneration process or converts it to the concentrated wastewater tank. Can be discharged.

The electrical conductivity meter 10 measures the electrical conductivity of the treated water processed by the CDI module 30 and provides it to the control unit 20 to determine the end of the regeneration process.

The treated water circulation unit 60 may flow the treated water discharged from the CDI module 30 back into the CDI module 30 to circulate the treated water.

Here, the treated water circulation unit 60 is a shut-off valve 64 that blocks the treated water discharged from the CDI module 30 and a circulation for introducing the treated water discharged from the CDI module 30 to the CDI module 30. The treated water can be circulated by including the pump 62.

The control unit 20 operates the purified water supply valve 40 during the regeneration process to supply the set amount of purified water to the CDI module 30, and operates the CDI module 30 in the regeneration mode, and then operates the CDI module 30 from the electric conduction system 10. Based on the input electrical conductivity, when the increase in electrical conductivity is less than or equal to the set value, the concentrated water discharge valve 50 is operated to discharge the treated water, and then the water purification process may be switched.

Here, in order to increase the efficiency of the CDI module 30, the control unit 20 may circulate the treated water through the treatment circulation unit 60 so that regeneration can be performed using a minimum amount of purified water.

In addition, the control unit 20 shuts off the purified water supply valve 40 to allow the influent water to flow into the CDI module 30 during the water purification process, and the treated water flows into the water purification tank 70 by blocking the concentrated water discharge valve 50 So that the CDI module 30 can be operated in the water purification mode for a set time.

When looking at the electrical conductivity of the treated water in the CDI module as shown in FIG. 3, the conductivity of the influent is kept constant, and when the water purification process is performed for a set time, the electrical conductivity is initially dropped and then maintained.

After the set time has elapsed, if the electrical conductivity of the concentrated wastewater in the regeneration process rises and then the rise change is less than the set value, that is, if there is no change, it drops sharply as the concentrated wastewater is discharged, and then the influent flows into the water purification process. The process of will be repeated.

As described above, according to the capacitive deionized water treatment apparatus according to an embodiment of the present invention, by circulating a set amount of purified water in the regeneration process by the capacitive deionization method, the regeneration process is performed, thereby minimizing the amount of water used. By reducing the amount of concentrated wastewater, productivity can be improved, and operation efficiency can be improved by optimizing the regeneration time by performing the regeneration process based on electrical conductivity.

4 is a flowchart illustrating a control method of a capacitive deionized water treatment apparatus according to an embodiment of the present invention.

As shown in FIG. 4, in the control method of the capacitive deionized water treatment apparatus according to an embodiment of the present invention, first, the control unit 20 operates the purified water supply valve 40 in the regeneration process to CDI the set amount of purified water. It is supplied to the module 30 (S10).

After supplying purified water to the CDI module 30 in step S10, the controller 20 operates the CDI module 30 in the regeneration mode (S20).

After operating the CDI module 30 in the regeneration mode in step S20, the control unit 20 may allow the treated water to circulate to the CDI module 30 through the treated water circulation unit 60 (S30).

While operating the CDI module 30 in the regeneration mode in steps S20 and S30, the controller 20 receives the electrical conductivity of the treated water from the electrical conduction meter 10 and determines whether the increase in electrical conductivity is less than or equal to a set value ( S40).

In step S40, it is determined whether the increase change in electrical conductivity is less than or equal to the set value, and when the increase change in electrical conductivity exceeds the set value, the control unit 20 returns to step S20 and repeats the above process to perform the regeneration process.

On the other hand, in step S40, when it is determined whether the increase change in electrical conductivity is less than or equal to the set value, and when the increase change in electrical conductivity is less than the set value, the control unit 20 operates the concentrated water discharge valve 50 to discharge concentrated wastewater as treated water. Do (S50).

After discharging the concentrated wastewater in step S50, the control unit 20 stops the operation of the purified water supply valve 40 so that the influent water flows into the CDI module 30 (S60).

After converting the influent water to flow into the CDI module in step S60, the controller 20 operates the CDI module 30 in the water purification mode (S70).

After operating the CDI module 30 in the water purification mode in step S70, the control unit 20 stops the operation of the concentrated water discharge valve 50 and converts the treated water to flow into the water purification tank 70 (S80).

After converting the treated water to flow into the water purification tank 70 in step S80, the controller 20 returns to step S60 for a set time and repeats the above process to perform the water purification process (S90).

As described above, according to the control method of the capacitive deionized water treatment apparatus according to an embodiment of the present invention, the amount of purified water is used by circulating a set amount of purified water in the regeneration process by the capacitive deionization method. By minimizing and reducing the amount of concentrated wastewater, productivity can be improved, and the regeneration process can be performed based on electrical conductivity, thereby optimizing the regeneration time and improving operational efficiency.

The implementation described herein may be implemented in, for example, a method or process, an apparatus, a software program, a data stream or a signal. Although discussed only in the context of a single form of implementation (eg, only as a method), the implementation of the discussed features may also be implemented in other forms (eg, an apparatus or program). The device may be implemented with appropriate hardware, software and firmware. The method may be implemented in an apparatus such as a processor, which generally refers to a processing device including, for example, a computer, a microprocessor, an integrated circuit or a programmable logic device, or the like. Processors also include communication devices such as computers, cell phones, personal digital assistants ("PDAs") and other devices that facilitate communication of information between end-users.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is only illustrative, and those of ordinary skill in the field to which the technology pertains, various modifications and other equivalent embodiments are possible. I will understand.

Therefore, the true technical protection scope of the present invention should be determined by the following claims.

10: electric conduction meter 20: control unit
30: CDI module 40: purified water supply valve
50: concentrated water discharge valve 60: treated water circulation unit
62: circulation pump 64: shut-off valve
70: water purification tank

Claims (8)

A CDI module that purifies by removing ions from the influent water in the water purification mode by a capacitive deionization method and regenerates by desorbing ions adsorbed on the electrode in the regeneration mode;
A purified water supply valve for blocking inflow water and introducing purified water into the CDI module;
A concentrated water discharge valve for discharging concentrated waste water from the CDI module;
An electric conductivity meter for measuring the electric conductivity of the treated water processed by the CDI module; And
In the regeneration process, the purified water supply valve is operated to supply a set amount of purified water to the CDI module, and the CDI module is operated in a regeneration mode, and the concentrated water discharge valve is turned on based on the electric conductivity input from the electric conduction meter. Capacitive deionized water treatment device comprising a; control unit for converting to a water purification process after discharging the treated water by operation.
The method of claim 1, further comprising: a treated water circulation unit for circulating the treated water discharged from the CDI module and introducing the treated water into the CDI module,
The control unit operates the CDI module in a regeneration mode and then circulates the treated water through the treatment circulation unit.
The capacitive deionized water treatment apparatus of claim 2, wherein the treated water circulation unit blocks the treated water discharged from the CDI module and introduces and circulates the treated water discharged through the circulation pump to the CDI module. .
The capacitive deionized water treatment apparatus according to claim 1, wherein the control unit switches to a water purification process when the increase change of the electrical conductivity is less than or equal to a set value.
The method of claim 1, wherein the control unit shuts off the purified water supply valve during the water purification process to allow influent water to flow into the CDI module, and blocks the concentrated water discharge valve so that the treated water flows into the water purification tank, and the CDI module Capacitive deionized water treatment device, characterized in that operating for a set time in the water purification mode.
A step of supplying a set amount of purified water to the CDI module by operating the purified water supply valve during the regeneration process, and operating the CDI module in a regeneration mode;
Receiving, by the control unit, electric conductivity from an electric conduction field after operating the CDI module in a regeneration mode; And
And converting the treated water to a water purification process after the control unit receives the electrical conductivity, determines an increase in the electrical conductivity, operates a concentrated water discharge valve, and discharges the treated water. How to control the device.
The method of claim 6, further comprising: circulating the treated water discharged from the CDI module through a treated water circulation unit and introducing the treated water into the CDI module after the control unit operates the CDI module in a regeneration mode. Control method of a capacitive deionized water treatment device.
The method of claim 6, wherein the step of converting to the water purification process,
Supplying influent water to the CDI module by blocking the purified water supply valve by the control unit;
The control unit blocking the concentrated water discharge valve so that the treated water discharged from the CDI module flows into the purified water tank; And
And operating the CDI module in a water purification mode for a set time by the control unit.

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