KR100973669B1 - Clean water treating system of small scale waterworks using capacitive deionization - Google Patents

Abstract

PURPOSE: A clean water treating system of small scale waterworks using capacitive deionization is provided to protect a post-processing device by removing a suspended solid and a hardening ion material from feed water. CONSTITUTION: A clean water treating system of small scale waterworks using capacitive deionization comprises: a complex preprocessing device(30) which removes a foreign material of feed water; a hollow fiber type precision filtering unit which includes a post-processing device for filtering the water filtered from the complex preprocessing device, is connected to the complex pre-processing device and includes a porosity filtration membrane of 0.1 ~ 0.2 μm; and an oxidizer generating unit(50) which creates and supplies an oxidizer by being connected with the pre and post-processing device, wherein the post-processing device includes an accumulated deionization stack(41) and a CDI reaction tube(40).

Description

Clean water treatment system of simple water supply using deionization deionization {CLEAN WATER TREATING SYSTEM OF SMALL SCALE WATERWORKS USING CAPACITIVE DEIONIZATION}

The present invention relates to a water treatment system for treating the constant water of a simple tap water, and more particularly, to protect the after-treatment apparatus connected to the rear end by removing the contaminants and suspended solids in the influent through the complex pre-treatment device, The post-treatment device that receives the filtered water utilizes electrical characteristics between the carbon electrodes to allow negative ions to be adsorbed on the positive electrode and positive ions to move to the negative electrode, thereby charging each other, thereby effectively eliminating dissolved inorganic ions contained in the water. The present invention relates to a water treatment system for simple tap water using the method.

In general, simple tap water is installed in mountain walls and islands where the supply water line is not accessible from wide water supply.

The simplified tap water uses valley water, groundwater, or rock leachate as a source of water, and a filtering facility may be provided to remove foreign substances contained in raw water taken from the intake source and supply it to the reservoir according to the characteristics of the raw water.

Such a filtering facility is often used to filter raw water through a filter tank filled with a filter medium such as sand or gravel. However, when there is a large seasonal fluctuation or turbidity change, the filter medium may be replaced at an appropriate time. There is a problem that the filtration facility is clogged because it is not washed.

In addition, although physical filtration can be performed by using sand or gravel as the filter medium, there is a problem that chemical filtration cannot be performed.

In addition, the above-described conventional filtration facility has a problem that it is difficult to remove the dissolved ions contained in the raw water. That is, the physical filtration alone hardness sex ion material (Ca ^{2 +,} MG ^2+, etc.), nitrate ion (NO ₃ ^-) or arsenic (As: Arsenic), it is difficult to remove a variety of harmful heavy metal ions, including.

Accordingly, as a method for compensating the above problems, methods such as electrocoagulation or ion exchange resin method and electrophoresis using an ion exchange membrane have been proposed. Secondary contaminants may be generated by periodic replacement and the use of excess acid or basic cleaning solution for regeneration of the ion exchange resin.

 Therefore, the problem to be solved by the present invention is to protect the post-treatment device of the rear end by performing a filtration on the hardness of the ionic material contained in the influent by the complex pre-treatment device of a simple tap water, filtered water filtered through the composite pre-treatment device It is an object of the present invention to provide a simple tap water treatment system using a capacitive deionization method capable of improving the water quality of water by removing various ionic substances contained therein.

In addition, there is another object to provide a simple tap water treatment system using a capacitive deionization method that is less pollution, energy-efficient than the conventional deionization process, and can reduce the management cost.

In addition, by using the chlorine dioxide composite oxidizing material generating and supplying device, it is easy to regenerate the filter material of the composite pretreatment device as well as to use a capacitive deionization method that can minimize or prevent contamination of activated carbon electrodes by organic matter in the CDI process. It is another object to provide a water treatment system of waterworks.

In an embodiment of the present invention, there is provided a water purification treatment system for simple tap water using a power storage deionization method, comprising: a complex pretreatment apparatus for removing foreign substances from influent raw water; A post-processing device in communication with the complex pretreatment device, for filtering filtered water from the complex pretreatment device to be purified; And an oxidant generating unit interlocked with the pretreatment unit and the post-treatment unit to generate and supply an oxidant, wherein the post-treatment unit applies a current to the storage deionization stack and the storage deionization stack composed of a porous activated carbon electrode layer. It is provided with a power supply unit for, and consists of a CDI reactor for removing harmful ions contained in the filtered water.

At this time, the complex pre-treatment device and the water intake pipe is communicated to the upper portion and the incoming raw water is received; A first filtration part composed of a microporous metal mesh coupled to surround both surfaces of the microfiltration nonwoven fabric and the microfiltration nonwoven fabric disposed inside the body portion; It is disposed in the inner center of the body portion, the filter medium having a relatively smaller diameter than the first filter portion to be spaced apart from the first filter portion and to maintain a predetermined space coupled to the microporous metal mesh to surround the outer surface of the filter medium. A second filter unit configured; A water outlet tube passing through the body and communicating with the filter medium; A conveying tube having one side joined to the water outlet tube and the other side passing through the body to communicate with a predetermined space of the second filtering portion; An oxidant discharge pipe passing through the body part and communicating with a predetermined space of the second filter part; And it is configured to include an opening and closing portion for opening and closing the flow of the fluid respectively installed in the discharge pipe, the conveying pipe and the oxidant discharge pipe.

In addition, the composite pretreatment device may further comprise a vortex plate formed in a spiral form at a predetermined interval along the longitudinal direction of the body portion in the inner peripheral portion of the body portion.

On the other hand, the above-mentioned oxidant generating unit using NaCl and NaClO ₂ as a raw material to produce an oxidizing agent of NaOCl, HOCl and ClO ₂ by an electrochemical method, and supplies it to the CDI reactor and composite pretreatment of the post-treatment device .

In addition, the oxidant generating unit may be configured to include a mixing means for mixing the oxidant of the NaOCl, HOCl and ClO ₂ .

According to a preferred embodiment of the present invention, the purified water treatment system is disposed between the complex pretreatment device and the aftertreatment device, and is in communication with both devices, and performs fine filtration on the inflow water flowing from the complex pretreatment device to perform the aftertreatment device. It may be configured to further include a backwash type microfiltration unit is provided with a porous filtration membrane of 0.1 to 0.2 ㎛ pore size to be introduced into.

In addition, the CDI reaction tank is composed of a plurality of communication with each other, the valve may be provided in the front end.

Such a plurality of CDI reactor may be configured in parallel or in series or parallel series structure.

In addition, the plurality of CDI reaction tanks may be provided with ion measuring means at the front end of the filtered water of the complex pre-treatment device, each may be provided with ion measuring means at the rear end of the treated water discharge.

Meanwhile, according to another embodiment of the present invention, the valve is connected to each ion measuring unit to collect data on the ion content of the treated water discharged from each CDI reactor, and compare and analyze a predetermined reference value and the collected data. It may be configured to further include a control unit for opening and closing the.

At this time, the control unit is provided with a display for expressing the ion content of the treated water discharged from each CDI reaction tank and the alarm means for identifying and informing the cleaning time of each CDI reaction tank.

On the other hand, the CDI reactor may be composed of a plurality of laminated structure at each electrode of the storage deionization stack at a predetermined interval.

As described in detail above, the constant water purification system of the simplified tap water using the capacitive deionization method of the present invention is characterized by congestion in raw water by simultaneously performing physical filtration using a filtration screen and a nonwoven fabric and chemical filtration using a filtration material through a complex pretreatment device. There is an advantage to protect the post-treatment device by removing the material, suspended solids and hardness ionic materials.

In addition, the composite pretreatment apparatus is a multipurpose pretreatment apparatus configured to perform a filtration process, a backwashing process, and a regeneration process. In particular, the complex pretreatment apparatus may be supplied with sodium chloride from an oxidant generating unit that generates a complex oxidant, thereby regenerating the filter medium for chemical filtration. There is an advantage.

The post-treatment apparatus which receives the filtered filtrate from the complex pretreatment apparatus as described above performs a process of removing harmful ions such as nitrate nitrogen ions contaminated by organic heavy matters and harmful heavy metal ions. There is an advantage to improve.

The post-treatment device does not require shortening of electrode life due to continuous ion dissolution and periodic replacement of the electrode according to the application of capacitive deionization technology, and a small amount of voltage between 1.2 V and 2.0 V on the activated carbon electrode for electrical adsorption. This is economical because it reduces administrative costs.

Finally, the oxidant generating unit generating the oxidant is in communication with the complex pretreatment unit and the CDI reactor, respectively, to perform a regeneration process for the filter medium from the complex pretreatment unit, and the phenomenon of contamination of the activated carbon electrode by the organic matter of the CDI reactor There is an advantage that can be minimized.

In addition, the oxidant generating unit can effectively remove the organic matter adsorbed on the activated carbon electrode during the desorption process in the CDI process by being connected to the plurality of CDI reaction tanks, and the CDI reaction tank composed of the plurality of processes alternately repeats the adsorption and desorption process. The CDI reactor, which is capable of continuous ion removal and is installed at the rear stage, has the advantage of effectively reducing or minimizing the high concentration ion concentration produced in the CDI process by reprocessing the ion concentrate water discharged from the desorption process of the CDI reactor at the front end. have.

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

1 is a view showing a water purification treatment system of a simple tap water using the electricity storage deionization method of the present invention, Figure 2 is a view showing a composite pre-treatment device of one configuration of the present invention, Figure 3a to 3c is a view of the present invention It is a figure which shows the operation state of the composite preprocessing apparatus which is a structure. In addition, Figure 4 is a view showing the configuration of the water treatment system of the simplified tap water using the power storage deionization method according to an embodiment of the present invention, Figure 5 is a simplified using a power storage deionization method according to another embodiment of the present invention 6 is a view showing the configuration of the water treatment system of waterworks, and FIG. 6 is a view showing the configuration of a water treatment system of the simplified tap water using an electricity storage deionization method according to another embodiment of the present invention.

On the other hand, Figure 7 is a view for explaining the storage deionization stack of the after-treatment apparatus of one configuration of the present invention, Figure 8 is a side showing an embodiment of the storage deionization stack of the after-treatment device of one configuration of the present invention It is a cross section.

In the purified water treatment system of the simplified tap water using the electricity storage deionization method of the present invention, as shown in FIG. 1, the raw water introduced from the intake pipe 11 is removed by using the complex pretreatment device 30 to remove foreign substances included in the incoming raw water. After filtration, the filtered filtrate is configured to be purified by flowing into the after-treatment device. In this case, the post-treatment device is nitrate nitrogen ions (NO ₃ ⁻ ) contaminated by organic substances such as arsenic (As), fluorine (F), lead (Pb), etc. contained in the surface water or ground water. Capacitive deionization (Capacitive deionization) that can remove the harmful ions such as the like will be used.

In addition, the purified water treatment system according to the present invention is to remove the microbial film formation or contamination by organic matter in the post-treatment device, the oxidant generating unit 50 for supplying the oxidant required for the regeneration process of the composite pre-treatment device 30 is It is comprised so that it may communicate with the said composite preprocessing apparatus 30 and a post-processing apparatus.

First, in the present invention, the complex pretreatment device 30 is composed of a complex reactor for performing filtration, backwashing and regeneration processes for influent raw water. As shown in FIG. 2, the body part 10 and the body part are shown. (10) It is composed of a first filtration unit 20 and a second filtration unit 25 installed therein.

Specifically, the complex pretreatment device 30 is formed with a body portion 10 for receiving the raw water flowing from the intake pipe (11). The body portion 10 is a container shape in which a storage space is formed therein, the shape of which may be variously manufactured, and the present invention is not limited to the shape of the body portion 10. The upper portion of the body portion 10 may be provided with a cover 12 to enable opening and closing. At this time, the fastening structure of the cover 12 may have a structure that forms a flange around the cover 12 and is fastened to the upper portion of the body portion 10 by bolting.

Looking at the body portion 10 with reference to Figure 2, one side of the body portion 10 is formed with a water intake pipe 11 so that the raw water flows through the inside, the intake pipe 11 is the body portion 10 It is preferable that the raw water introduced and formed at the top is configured to fall naturally within the body portion 10.

The vortex plate 13 may be formed on the inner circumference of the body portion 10, and preferably, may have a spiral shape having a predetermined interval along the longitudinal direction of the body portion 10. Accordingly, when raw water flows into the body portion 100 through the water intake pipe 11, a rotatable vortex may be formed through the vortex plate 13 having a spiral shape.

In addition, the first filtration unit 20 and the second filtration unit 25 is configured inside the body portion 10 so that the raw water introduced from the intake pipe 11 may be filtered.

In the first filtration unit 20, a microfiltration nonwoven fabric 21 for removing contaminants and suspended solids in the inflowing raw water is disposed in the circumferential direction in the receiving space of the body portion 10. In addition, the microporous metal mesh 22 supporting the microfiltration nonwoven fabric 21 and configured to penetrate the raw water is coupled to surround both surfaces of the microfiltration nonwoven fabric 21. At this time, the microporous metal mesh 22 is preferably made of stainless steel (Stainless) to prevent corrosion.

On the other hand, the second filter portion 25 is disposed in the center of the inside of the body portion 10, and is configured to have a relatively smaller diameter than the first filter portion 20 and with the first filter portion 20 The space is maintained due to the separation distance. This predetermined space becomes a space where fluid flows during the backwashing process.

The second filtration unit 25 is for removing the hardness material contained in the incoming raw water, and may be filled with a filter material 26 such as an ion exchange resin or zeolite. In addition, the outer surface of the filter medium 26 is coupled to the microporous metal mesh 22 having the same structure as the first filtration unit 20 described above to support the filter medium 25.

The filter medium 25 may be configured to be regenerated according to the degree of contamination in using an ion exchange resin or a zeolite material. For example, the filter medium 25 is configured to be regenerated using sodium chloride, and the supply of such sodium chloride may be made from the oxidant generating unit 50 described later.

The oxidant generating unit 50 serves to generate an oxidizing agent of NaOCl, HOCl or ClO ₂ by electrochemical method using NaCl and NaClO ₂ as a raw material, and is in communication with the rear end of the complex pretreatment device 30 The oxidant is supplied during the regeneration process of the composite pretreatment device 30. Accordingly, the filter medium 26, that is, the ion exchange resin or the zeolite of the second filtration unit 25 may be supplied with sodium chloride (NaCl) solution to regenerate the filter medium 26. Such a configuration of the oxidant generating unit 50 will be described in detail below.

On the other hand, the first filtration unit 20 and the second filtration unit 25 is shown in the shape of the bottom is closed and the top is open, the fine filtration non-woven fabric 21 and the filter medium 26 is freely filled or This is to allow replacement. Of course, the openings of the first filtration unit 20 and the second filtration unit 25 are provided with a cover to open and close the cover so that the microfiltration nonwoven fabric 21 and the filter medium 26 can be filled and replaced. do.

In addition, the bottom surface of the second filtration unit 25 is configured with a discharge pipe 14 in communication with the filter medium 26 from the outside, the discharge pipe 14 is configured to be exposed to the outside of the body portion 10 And it is in communication with the after-treatment device to be described later is configured to allow the filtered water filtered through the second filtration unit 25 to enter the after-treatment device.

On the other hand, the lower side of the body portion 10 is formed with a conveying pipe 15 and the oxidant discharge pipe 16, the conveying pipe 15 is configured so that one side is joined with the discharge pipe 14, the other side It penetrates through the body part 10 and communicates with a predetermined space formed due to the separation distance between the first filtration part 20 and the second filtration part 25. In addition, the oxidant discharge pipe 16 passes through the body portion 10 and communicates with a predetermined space of the second filtration portion 15. At this time, the water outlet pipe 14, the conveyance pipe 15 and the oxidant discharge pipe 16 are each formed with an opening and closing portion 18 to open and close the flow of the fluid.

Again, the body portion 10 is composed of a drain pipe 17 on its lower surface, and the filter is filtered through the first filtration part 20 and the second filtration part 25 as the drain pipe 17 is configured. When foreign matters having large particles or foreign matters by the backwashing process are deposited on the lower surface of the body part 10, foreign matters may be leaked to the outside. As described above, the drain pipe 17 also forms an opening / closing portion 18 to open and close the flow of the fluid so as to discharge the foreign matter precipitated through any manipulation.

As such, the raw water introduced through the composite pretreatment device 30 according to the present invention can perform excellent filtration by simultaneously performing physical filtration using the nonwoven fabric 21 and chemical filtration using the filter medium 26.

According to an embodiment of the present invention, as shown in FIG. 4, a back-wash micro filter (BMF) 90 connected to the rear end of the complex pretreatment device 30 may be further configured. Can be.

This is to filter the fine particles contained in the filtered water from the composite pre-treatment device 30 by using a porous microfiltration membrane (not shown) having a size of 0.1 to 0.2 ㎛ to increase the water quality of the treated water and, It serves to protect the processing device. The backwash precision filtration unit 90 may be configured according to the known art, but may be configured in various forms. According to the present invention, the backwash precision filtration unit 90 may be composed of a porous high strength composite hollow fiber membrane and a blower to increase the efficiency of the backwashing process. . When the backwash type microfiltration unit 90 is contaminated with pores on the surface of the porous hollow fiber membrane by the filtration process through the second filtration unit 25, and the amount of water to be treated decreases, the treated water is treated based on the pressure difference between the front and rear ends of the filtration membrane. And air backwashing at the same time is configured to obtain the amount of membrane treatment.

Hereinafter, an operating state of the composite pretreatment device 30 according to the preferred embodiment of the present invention will be described with reference to FIGS. 3A to 3C.

The operation of the composite pretreatment device 30 according to the invention consists of a filtration step, a backwashing step and a regeneration step. In the filtration step, as shown in FIG. 3A, raw water introduced through the water intake pipe 11 passes through a fine filtration nonwoven fabric 20 and a filter medium 26 such as an ion exchange resin or zeolite, and contaminants in the incoming raw water. Suspended solids and hard ionic substances present in the water are removed, and this filtered water is introduced into the post-treatment process or backwash microfiltration process.

In the backwashing step, the microporous metal mesh 22 coupled to both surfaces of the microfiltration nonwoven fabric 21 and the nonwoven fabric 21 is contaminated by a contaminant material or a suspended solid introduced in a continuous filtration process. When the amount of filtration decreases, the treated water is conveyed to the body portion 10 through the conveying pipe 15 as shown in FIG. 3B.

Accordingly, the treated water flows into the predetermined space between the first filter part 20 and the second filter part 25 by passing through the body part 10, and the inflow water is ion exchanged at the center of the body part 10. Along with the microporous metal mesh 22 surrounding the outer periphery of the filter medium 26 such as resin or zeolite, a backwashing process is performed from the inside of the microfiltration nonwoven fabric 21 to the outside, and external raw water is introduced therethrough. Through the generated high flow rate and the rotary vortex plate 13, the contaminants attached to the surface of the microfiltration nonwoven fabric 21 and the external microporous metal mesh 22 are quickly desorbed and removed.

Foreign substances including contaminants desorbed through the backwashing step are deposited on the lower surface of the body portion 10 and are discharged to the outside by opening the opening / closing portion 18 of the drain pipe 17.

On the other hand, the regeneration step is to produce an oxidant electrochemically when the ion exchange capacity of the filter medium 26, such as ion exchange resin or zeolite disposed in the center of the body portion 10 as shown in Figure 3c reaches a limit value The sodium chloride solution, which is a raw material for complex oxidant generation, is supplied from the oxidant generator 50 through the outlet pipe 14, and the filter medium 26, such as an ion exchange resin or zeolite, filled in the second filter unit 25 is regenerated. Let's go.

Specifically, the regeneration principle of the filter medium will be described. A large number of functional groups exist on the surface of the ion exchange resin, and the ion exchange resin or zeolite in the initial state without ion exchange is adsorbed in the form of sodium ions and then continuously filtered. As a result, various cation components contained in the water are exchanged with sodium ions on the surface of the ion exchange resin or zeolite. After the ion exchange is complete and the ion exchange capacity of the ion exchange resin or zeolite becomes saturated, the hard water from which the hard ions are removed is discharged together with the incoming raw water.

Therefore, by supplying sodium chloride, various cationic components adsorbed on the functional groups on the surface of the filter medium 26, such as ion exchange resin or zeolite, are desorbed and re-exchanged with sodium as in the initial state to remove the hardness ions again. . At this time, the concentration of the sodium chloride solution supplied from the oxidant generating unit 50 is preferably in the range of about 8 to 10%.

Thereafter, the sodium chloride solution which has undergone the regeneration process is discharged to the outside through the oxidant discharge pipe (16).

The filtered water filtered using the composite pretreatment device 30 described above is introduced into the post-treatment device and purified, and finally purified and supplied to the water storage tank. According to a preferred embodiment of the present invention, the post-treatment device is a CDI reactor 40 It can be configured as.

Specifically, the CDI reaction tank 40 is connected to the rear end of the complex pretreatment device 30, that is, the outlet pipe 14 of the complex pretreatment device 30 to receive the filtered water, and to remove harmful ions in the filtered water. do.

The CDI reactor 40 includes a power storage unit 42 for applying a current to the storage deionization stack 41 and the storage deionization stack 41 having hydrophilic porous activated carbon electrode layers 400 and 410 therein. )

The capacitive deionization stack 41 of the CDI reactor 40 uses capacitive deionization, which will be described in detail with reference to FIGS. 7 to 8.

The capacitive deionization method is a technique in which an electric driving force is added to a conventional adsorption and ion exchange mechanism, which utilizes high electrical conductivity and adsorption capacity of a carbon body, and is characterized by easy desorption and regeneration of an electrode adsorbent by simple potential reversal. Have

In addition, by forming a porous carbon electrode in the form of a stack (stack) to remove the salt in the inorganic ion state contained in the water, this method is less pollution than ion exchange, reverse osmosis, electrodialysis and evaporation method.

In addition, the energy consumed in the desalination process of brackish water by the reverse osmosis method is generally about 2.3KWh / ㎥, whereas in the desalination process of brackish water by the deionization method, about 0.05 to 0.1KWh / ㎥ It is known that it consumes a degree of energy, the capacitive deionization method is an economical technology that is energy-efficient and costs are reduced.

First, the principle of the capacitive deionization stack is that anion and cation contained in water pass between the hydrophilic porous carbon electrode layers 400 and 410 constituting the capacitive deionization stack 41. In this case, by applying a trace voltage of about 1.0 to 2.0 V to the porous carbon electrode, the inorganic ions contained in the water are absorbed and removed from the inorganic ionic component in the medium by using the electrical properties between the dissolved inorganic ions and the carbon electrode.

For example, an anion such as Cl ⁻ is adsorbed to the anode 400 by the electrostatic force between the two carbon electrodes, and a cation such as Na ⁺ is transferred to the cathode 410 to charge each other. It effectively removes inorganic ionic components in water.

In addition, the ionic components charged and adsorbed on the positive electrode 400 and the negative electrode 410 are ion components which are adsorbed to the electrode by applying no current or applying reverse current after the adsorption operation for removing the ionic components in water is performed. To be discharged with the medium.

As described above, the activated carbon electrodes 400 and 410 of the capacitive deionization stack 41 have a shorter electrode life due to the continuous elution of the electrode and the periodicity of the used electrode, unlike the iron or aluminum electrode used in the conventional electrocoagulation process. It is economical because it does not require replacement and the maintenance cost is reduced by using a small amount of power supply between 1.2 and 2.0V supplied to the activated carbon electrode for electrical adsorption.

Meanwhile, referring to another embodiment of the capacitive deionization stack 41 that is one configuration of the post-treatment apparatus according to the present invention, the capacitive deionization stack 41 has an electrode inside thereof free of fluid as shown in FIG. 8. The plurality of stacked structures may be configured by the porous spacers 420 at predetermined intervals or at predetermined intervals to be moved.

That is, the capacitive deionization stack 41 is disposed between the plurality of electrodes 400 and 410 spaced apart from each other, and is disposed between the plurality of positive electrodes 400 which are modified to be hydrophilic to which a + power is applied and the plurality of positive electrodes. And a negative electrode 410 that is modified to be hydrophilic to which power is applied.

Accordingly, a plurality of electrodes are stacked to allow positive and negative voltages to be alternately applied to the electrodes so that positive and negative ions harmful to the human body in the filtered water filtered using the composite pretreatment device are more efficiently absorbed and desorbed on the electrode surface. By doing so, it is possible to efficiently purify the constant of the drinking water used as drinking water.

In this case, the CDI reactor 40 includes a plurality of positive electrodes 400 and a negative electrode 410 that supply DC power to the storage deionization stack 41.

At this time, the positive electrode 400 and the negative electrode 410 is made of a carbonaceous material such as activated carbon, graphite, carbon airgel electrode and carbon composite electrode, and the following electrical adsorption, desorption reaction according to the power supply of the power unit 42 This happens.

Anode: X ^{m +} -> X ^{m +} Adsorption / Carbon Electrode

A negative electrode ^{(cathode): Y n - -} > Y n - Adsorption / Carbon Electrode

X: Cationic ions such as Na ⁺ , K ⁺ , Ca ^{2 +} , MG ^{2 +} (Metal ions)

_{^{Y: PO 4 3 -, Cl}} -, SO 4 2 -, NO 3 - anion acids such as

m: the number of electrons of the cation used for the reaction

n: the number of electrons of the anion used in the reaction

On the other hand, the water treatment system according to the present invention is in communication with the CDI reaction tank 40, the oxidant generating unit for the oxidant for removing the organic matter adsorbed on the electrodes (400, 410) inside the capacitive deionization stack 41 ( 50).

The oxidant generating unit 50 generates and supplies an oxidizing agent of NaOCl, HOCl or ClO ₂ by electrochemical method using NaCl and NaClO ₂ as raw materials, or as shown in FIG. Including NaOCl, HOCl or ClO ₂ oxidant is mixed and the mixed oxidant is supplied to the CDI reactor (40).

Looking at the configuration of the oxidant generating unit 50, a raw material storage tank for storing the raw material of NaCl and NaClO ₂ , a raw material supply pump for transferring the raw material from the raw material storage tank to the membrane-free electrolytic cell, and the raw material storage tank NaCl and NaClO ₂ feedstocks were supplied from NaOCl, HOCl and ClO ₂ by electrochemical oxidation. Or it consists of a membrane-free electrolysis cell which produces | generates the mixed oxidizer which mixed these, and the electric current supply apparatus which supplies the electric current required for the electrolysis reaction of the said membrane-free electrolysis cell.

Therefore, the organic matter adsorbed to the activated carbon electrodes 400 and 410 may be effectively removed during the desorption process of the capacitive deionization process of the CDI reactor 40 through the oxidant supplied from the oxidant generator 50. In addition, the oxidant generating unit 50 is also in communication with the above-described complex pretreatment device 30 serves to supply a sodium chloride solution required for the regeneration of the ion exchange resin or zeolite filter medium (26).

As described above, according to the constant water treatment system of the simplified tap water using the capacitive deionization method, the hardness of the ionic material (Ca ^{2 +} , MG) in the inflow water is obtained by physically and chemically filtering the inflow water through the complex pretreatment device 30. It is able to remove the ^{2 +,} etc.), and thus it is possible then to protect the process apparatus along.

The CDI reactor 40 of the post-treatment device which receives the filtered water of the complex pretreatment device 30 described above is used to remove harmful heavy metal ions such as nitrate nitrogen ions (NO ₃ ⁻ ) or arsenic (As: Arsenic) contained in the filtered water. By removing, it is possible to improve the treated water quality of the constant.

On the other hand, Figure 5 is a view showing the configuration of the water treatment system of a simple tap water using the power storage deionization method according to another embodiment of the present invention, referring to Figure 5 CDI reactor 40 of the after-treatment apparatus It can be seen that it is configured and in communication with each other.

Specifically, the CDI reactor 40 is composed of a plurality of communication with each other, preferably, as shown in FIG. 5, the CDI reactor 40 may be configured in a parallel and parallel structure in parallel and in series.

In addition, it is reasonable that the CDI reactor 40 may be configured in a parallel or series structure. In addition, each of the plurality of CDI reaction tank 40, the front end of each valve 60 is provided so as to receive the oxidant from the oxidant generating unit 50 separately.

As described above, as the CDI reaction tank 40 is configured in plural, the ion desorption process is alternately repeated to perform continuous ion removal, as well as the storage deionization stack of the CDI reaction tank 40 'installed at the rear end ( 41 ') can effectively reduce or minimize the high concentration of ion concentrate water generated in the CDI process by reprocessing the ion concentrate water discharged from the desorption process of the capacitive deionization stack 41 of the two CDI reactors 40 installed at the front end. It becomes possible.

On the other hand, according to another embodiment of the present invention, the plurality of CDI reactor 40 has an ion measuring means 100, the influent water flowing into the CDI reactor 40 and dissolved inorganic in the treated water treated through the CDI reactor Ion can be measured.

Referring to FIG. 6, the plurality of CDI reactors 40 are each provided with ion measuring means 100 at each front end through which the filtered water filtered from the complex pretreatment device 30 flows into the CDI reactor 40. It is possible to provide the operator with the dissolved inorganic ion content in the reactor.

In addition, the ion measuring means 100 are respectively provided at the rear end of the treated water discharged through the plurality of CDI reaction tanks 40. The ion measuring means 100 measures the dissolved inorganic ion content in the treated water treated in each CDI reactor 40, and provides the operator with the measured inorganic ion content, thereby allowing the operator to remove electricity from each CDI reactor 40. The degree of efficiency of the ionization stack 41 can be expected.

That is, in the process of repeating adsorption and desorption of the activated carbon electrodes 400 and 410 of the deionization stack 41, the adsorption amount is saturated while the adsorption amount is saturated due to fine ions not removed from the surface thereof. Accordingly, the adsorption and desorption efficiency of the deionization stack 41 is gradually reduced.

The ion measuring means 100 is used as a means for informing the operator of the timing of cleaning the activated carbon electrodes 400 and 410 of the deionization stack 41 to compensate for the above-mentioned problems, and the operator may use the corresponding CDI reactor. By opening the valve 60 provided at the front end of the 40 to wash the activated carbon electrodes 400 and 410 of the capacitive deionization stack 41 with an oxidant, the efficiency of deionization can be increased.

Meanwhile, in the present embodiment, the controller 80 may be further configured to automatically process the above-described process.

The controller 80 is connected to each of the ion measuring means 100 to collect data on the ion content of the treated water discharged from each CDI reactor 40, and compare and analyze the predetermined reference value and the collected data Opening and closing the valve 60 is controlled.

Specifically, the controller 80 is connected to the ion measuring means 100 respectively provided at the rear end of the plurality of CDI reaction tank 40, each CDI reaction tank 40 through the data collected from each ion measuring means 100 Determine the ion content of the effluent from the plant.

In addition, the controller 80 controls the valve 60 of the CDI reactor 40 according to a predetermined reference value to supply and block the oxidant.

Herein, the predetermined reference value is a measurement value corresponding to a time requiring cleaning of the activated carbon electrodes 400 and 410, and the data about the dissolved inorganic ion content in the treated water is compared with the predetermined reference value, and the reference value is determined. When it is relatively higher, it is determined that the efficiency of the activated carbon electrode (400, 410) is lowered to open the valve 60 of the CDI reactor 40 to clean the activated carbon electrode (400, 410) through an oxidant do.

In addition, the control unit 80 is provided with a display for displaying the numerical value of the inorganic ion content of the influent water flowing into each CDI reaction tank 40 and the effluent water discharged from each CDI reaction tank 40. In addition, when the dissolved inorganic ion content in the effluent measured from the ion measuring means 100 is relatively higher than a predetermined value, an alarm means for notifying the cleaning of the corresponding CDI reactor 40 is provided.

As described above, the ion measuring means 100 can grasp the components of the dissolved inorganic ions of the treated water treated in each CDI reactor 40 to predict the efficiency of the activated carbon electrodes 400 and 410, and the controller 80 By controlling the valve (60) provided in each CDI reaction tank 40 by the control of the) it is possible to automatically wash the activated carbon electrodes (400, 410) of reduced efficiency.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present 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.

BRIEF DESCRIPTION OF THE DRAWINGS The figure which shows the water purification system of simple tap water using this invention electrostatic deionization system.

2 is a view showing a composite pretreatment device of one configuration of the present invention.

3a to 3c are views showing the operating state of the composite pretreatment apparatus of one configuration of the present invention.

4 is a view showing the configuration of a constant water treatment system of a simple tap water using the electricity storage deionization method according to an embodiment of the present invention.

5 is a view showing the configuration of a constant water treatment system of a simple tap water using the electricity storage deionization method according to another embodiment of the present invention.

Figure 6 is a view showing the configuration of a constant water treatment system of a simple tap water using the electricity storage deionization method according to another embodiment of the present invention.

7 is a view for explaining a storage deionization stack of a post-processing device of one configuration of the present invention.

Fig. 8 is a side cross-sectional view showing an embodiment of a power storage deionization stack of a post-processing device of one configuration of the present invention.

Explanation of symbols on the main parts of the drawings

10: body 20: first filtration

25: second filtration unit 30: complex pre-treatment device

40: CDI reactor 50: oxidant generating unit

60 valve 70 mixing means

80: control unit 90: backwash type precision filtration unit

100: ion measurement means

Claims (13)

In a purified water treatment system of a simple tap water, including a complex pretreatment device for removing foreign matter of the incoming raw water and a post-treatment device in communication with the complex pretreatment device and purifying the filtered water filtered from the complex pretreatment device, A porous filtration membrane having a pore size of 0.1 to 0.2 μm disposed between the composite pretreatment device and the post-treatment device so as to communicate with both devices, and to be introduced into the post-treatment device by performing fine filtration on the influent water flowing from the complex pretreatment device. The backwash type precision filtration unit is provided; And an oxidant generating unit communicating with the pretreatment device and the post-treatment device to generate and supply an oxidant. The post-treatment apparatus includes a capacitive deionization stack composed of a porous activated carbon electrode layer and a power supply unit for applying a current to the capacitive deionization stack, and includes a CDI reactor for removing harmful ions contained in the filtered water. Wherein, the CDI reactor is composed of a plurality of communication with each other, the front end of the purified water treatment system using a capacitive deionization method, characterized in that each valve is provided. The method of claim 1, The composite pretreatment device A water intake pipe is communicated with an upper portion of the inner periphery and a spiral-shaped swirl plate is formed at regular intervals along the longitudinal direction, and a body portion for receiving inflow water; A first filtration part composed of a microporous metal mesh coupled to surround both surfaces of the microfiltration nonwoven fabric and the microfiltration nonwoven fabric disposed inside the body portion; Is disposed in the inner center of the body portion, the filter medium having a relatively smaller diameter than the first filter portion so as to be spaced apart from the first filtration unit and coupled to surround the outer surface of the filter medium with a microporous metal mesh A second filter unit configured; A water outlet tube passing through the body and communicating with the filter medium; A conveying tube having one side joined to the water outlet tube and the other side passing through the body to communicate with a predetermined space of the second filtering portion; An oxidant discharge pipe passing through the body part and communicating with a predetermined space of the second filter part; And Simple water treatment system using a capacitive deionization method characterized in that it comprises an opening and closing portion which is installed in each of the discharge pipe, the conveying pipe and the oxidant discharge pipe to open and close the flow of the fluid. delete The method of claim 1, The oxidant generating unit using NaCl and NaClO ₂ as a raw material to produce an oxidizing agent of NaOCl, HOCl and ClO ₂ through an electrochemical method, and to supply the same to the CDI reactor and the composite pretreatment of the post-treatment device Simple tap water purification system using deionization. The method of claim 4, wherein The oxidant generating unit comprises a mixing means for mixing the oxidants of the NaOCl, HOCl and ClO ₂ The water purification treatment system of a simple tap water using a capacitive deionization method. delete delete The method of claim 1, The plurality of CDI reactor is a simple tap water purification system using a capacitive deionization method, characterized in that configured in parallel, series or parallel series structure. The method of claim 1, The plurality of CDI reaction tanks are purified water treatment system using a simple deionization method characterized in that each of the ion measuring means is provided at the front end of the filtration water of the complex pre-treatment device. The method of claim 1, The plurality of CDI reaction tank is a water purification treatment system of a simple tap water using a desorption method, characterized in that each of the ion measuring means is provided at the rear end of the discharged treated water. The method of claim 10, And a control unit connected to each ion measuring unit to collect data on the ion content of the treated water discharged from each CDI reactor, and to open and close the valve by comparing and analyzing a predetermined reference value and collected data. A simple tap water purification system using a power storage deionization method. The method of claim 11, The control unit includes a display for expressing the ion content of the treated water discharged from each CDI reactor and an alarm means for identifying and informing the cleaning time of each CDI reactor, the water purification process using the simplified deionization method system. The method of claim 1, The CDI reactor is a simple tap water purification system using a capacitive deionization method, characterized in that each electrode of the capacitive deionization stack has a plurality of laminated structures at predetermined intervals.

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