JP2003326272A - Electric regenerative demineralizer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric regenerative demineralizer which has a high removal perfor mance to a weak negative ion component and is relatively small-sized. <P>SOLUTION: The electric regenerative demineralizer is provided with a cathode chamber 2 having a cathode 1, an anode chamber 4 having an anode 3, one or more concentration chambers 8 constituted by disposing cation exchange membranes 6 on the anode 3 side and the anion exchange membranes 5 on the cathode 1 side between both electrodes, and the desalting chambers 7 in which a plurality of desalting chambers 7 among the following desalting chambers (a)-(e) are disposed and the ion exchange membranes are packed in the inside disposed with the following (a)-(e): (a) the desalting chamber 7 in which the cation exchange membrane 6 is disposed on the cathode 1 side and the anion exchange membrane 5 is disposed on the anode 3 side, (b) the desalting chamber 7 in which the cation exchange membranes 6 are disposed on both sides, c the desalting chamber 7 in which the anion exchange membranes 5 are disposed on both sides, (d) the desalting chamber 7 in which the cation exchange membrane 6 is disposed on the cathode 1 side and a bipolar membrane is disposed on the anode 3 side, and (e) the desalting chamber 7 in which the bipolar membrane is disposed on the cathode 1 side and the anion exchange membrane 5 is disposed on the anode 3 side. The electric regenerative demineralizer has the single desalting chamber 7 in which the concentration chambers 8, the anode chambers 4 or the cathode chambers 2 are disposed on both sides and a desalting chamber 7 group in which the desalting chambers 7 are plurality arranged in the adjacent relation respectively by one or more without interposing the concentration chamber 8. Therein, the outlets of the desalting chamber 7 group are connected with the inlet of the single desalting chamber 7 or the outlet of the single desalting chamber 7 is connected with the inlets of the desalting chamber 7 group. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric regenerative desalination apparatus, and more particularly to a relatively small electric regenerative desalination apparatus having a high ability to remove weak anion components.

[0002]

2. Description of the Related Art A conventional method for producing pure water is to pass water in an inlet of a desalting chamber through a container filled with an ion exchange resin and exchange the ions in the water in the inlet of the desalting chamber for H ⁺ and OH ⁻ ions. An ion exchange method for producing pure water is known. However, in this ion exchange method, when the exchange capacity of the ion exchange resin is saturated, an acid,
It is necessary to regenerate the ion exchange capacity using alkali. The regeneration operation of the ion exchange resin is complicated, and a large amount of acid,
There is a problem in that careful storage and handling and disposal of the alkali are required and the equipment becomes large. On the other hand, in recent years, an electric regeneration type desalination apparatus has been developed which regenerates an ion exchanger by electricity and continuously produces pure water. This is as shown in FIG.
By the DC power supply with the ion content inside applied to both ends of the device,
A device for removing water by moving it to the outlet water 13 of the concentrating chamber and the catholyte and anolyte, and an anion between the cathode chamber 2 having the cathode 1 and the anode chamber 4 having the anode 3 and between the cathode chamber 2 and the anode chamber 4. A desalting chamber 7 and a concentrating chamber 8 formed by arranging an exchange membrane 5 and a cation exchange membrane 6 are provided, and at least the desalting chamber 7 is filled with an ion exchanger 9.

The ion exchanger 9 may be any one having an ion exchange function such as an ion exchange resin, an ion exchange fiber, an ion exchange non-woven fabric having an ion exchange group introduced by a graft polymerization method, and a spacer. It may be an ion exchanger, and the anion exchanger and the cation exchanger are packed in a single or mixed form or in a multi-layer form. The cathode chamber inlet water 14 in the cathode chamber 2, the anode chamber inlet water 16 in the anode chamber 4, the concentration chamber inlet water 12 in the concentrating chamber 8, and the desalting chamber inlet water 1 in the desalting chamber 7.
By introducing 0 and applying a direct current between the cathode 1 and the anode 3, the ion component contained in the demineralization chamber inlet water 10 moves on the surface of the ion exchanger 9 in the direction of potential, Anions are anion exchange membrane 5 and cations are cation exchange membrane 6
Permeate to the concentrated water in the concentrating chamber 8, the catholyte in the cathode chamber 2 and the anolyte in the anode chamber 4, and the deionization chamber inlet water 10 is deionized to produce pure water 11. .

Ion exchanger 9 filled in the desalting chamber 7
Is continuously regenerated by H ⁺ and OH ⁻ generated by hydrolyzing, so that it is not necessary to regenerate with acid or alkali, and in this way, the pure water 11 can be continuously produced ( Patent No. 1782943, Patent No. 27
51090, each specification of Japanese Patent No. 2699256, Japanese Patent Application No. 10-153697, etc.). Recently, the desalination chamber 7 is divided into two desalination chambers by an intermediate ion exchange membrane, and the effluent water of one desalination chamber is introduced into the other desalination chamber to improve the desalination performance. A regenerative desalination device has also been developed (Japanese Patent Application Laid-Open No. 2-212058).
001-239270, JP 2001-327971 A).

In a relatively small electric regenerative desalination apparatus, as shown in FIG. 5, in addition to the water flow method shown in FIG.
A method of increasing the desalination capacity by increasing the desalination area by passing deionization chamber inlet water 10 in series to a plurality of desalination chambers 7 is also performed. In such a relatively small-sized electric regenerative desalination apparatus, the concentration chamber inlet water 12 also includes the concentration chamber 8 water.
In some cases, the cathode chamber outlet water 15 is used as the concentrating chamber inlet water 12 or the anode chamber inlet water 16 in some cases. In these electric regeneration type desalination equipment,
2, the cathode chamber inlet water 14, the anode chamber inlet water 16, and the desalting chamber inlet water 10 may flow in parallel flow or in counter flow, and the water flow method is not particularly limited. Also,
Both the cathode chamber 2 and the anode chamber 4 may be adjacent to the concentrating chamber 8 or the desalting chamber 7.

It is generally known that the conventional electric regenerative desalting apparatus described above is inferior in removing ability of weak anion components such as carbonic acid and silica as compared with removing ability of other ion components. It is also known that the removal rate of these weak anion components can be slightly improved by applying an excessive direct current to the electric regeneration type desalination device, but even in that case, the weak anion components are sufficiently removed. This is not possible, and the power consumption per unit flow rate will increase. Therefore, an electrically regenerative desalination apparatus in which a cartridge polisher made of an ion exchange resin is installed in the latter stage to perform ion exchange is configured in multiple stages, and after desalting with the first electrically regenerating desalination apparatus, the second Treatments such as further desalting with an electric regeneration type desalination device are performed as needed. However, such a treatment causes an increase in installation area, an increase in the number of devices, and an increase in price.

[0007]

In view of the above-mentioned prior art, the present invention improves the removal performance of the above-mentioned weak anion component in a relatively small-sized electric regenerative desalination apparatus, and weak anion component is improved. An object of the present invention is to provide an electric regenerative desalination apparatus capable of sufficiently removing water.

[0008]

In order to solve the above-mentioned problems, the present invention has a cathode chamber having a cathode and an anode chamber having an anode, and cation exchange on the anode side between the both electrode chambers. Membrane, at least one concentrating chamber configured by arranging an anion exchange membrane on the cathode side, and a desalting chamber of the following (a) to (e), (a) cation exchange membrane on the cathode side, anode side Deionization chamber with anion exchange membrane inside and ion-exchanger filled inside, (b) Deionization chamber with cation-exchange membrane inside and inside, (c) both sides A deionization chamber with an anion exchange membrane placed inside, and (d) a cation exchange membrane on the cathode side and a bipolar membrane on the anode side, and a deionization chamber filled with an ion exchanger inside. A salt chamber, (e) a bipolar membrane on the cathode side, an anion exchange membrane on the anode side, and an ion exchanger filled inside A desalting chamber, and a plurality of desalting chambers of any one or more types, and either one of the concentrating chamber, the anode chamber or the cathode chamber is disposed on both sides of the desalting chamber. An electrically regenerative desalination apparatus having one or more desalting chambers and a group of desalting chambers in which a plurality of one or more desalting chambers are adjacently arranged without a concentrating chamber therebetween. Then, the outlet of the desalination chamber group and the inlet of the single desalination chamber, or the outlet of the single desalination chamber and the inlet of the desalination chamber group are connected.

In the electric regenerative desalination apparatus, the group of desalination chambers arranged without a concentrating chamber between the treated water introduced into the first desalination chamber constituting the group of desalination chambers. , From the first desalting chamber to the final desalting chambers constituting the desalting chamber group, it is preferable to connect so as to perform desalting treatment by sequentially passing water in series. A plurality of desalination chamber groups are respectively arranged, and a plurality of single desalination chambers or groups of desalination chambers respectively arranged are connected so as to supply water to be treated in parallel or in series, and a plurality of them are also arranged. The connection of the water to be treated between the single desalination chamber and the group of desalination chambers is preferably such that at least one of them is supplied in series and the others are supplied in series or in parallel. In the desalting chamber, (a)
The ion exchanger packed in the desalting chamber of is an anion exchanger, a cation exchanger, or an ion exchanger of an anion exchanger and a cation exchanger, and the desalting chamber of (b) is packed. The ion exchanger to be used is a cation exchanger, and the ion exchanger to be filled in the desalting chamber of (c) is an anion exchanger to be filled in the desalting chamber of (d). The in-exchanger may be a cation-exchanger, and the ion-exchanger filled in the desalting chamber of (e) may be an anion-exchanger, and the ion-exchanger may be prepared by a radiation graft polymerization method. An ion exchanger made of ion exchange fibers having an ion exchange group introduced therein, and the ion exchanger made of the ion exchange fibers may be a non-woven fabric or a woven fabric, and a mesh spacer.

[0010]

DETAILED DESCRIPTION OF THE INVENTION According to the present invention, a concentrating chamber on both sides,
Alternatively, in an electric regenerative desalination apparatus having a single desalination chamber in which polar chambers are arranged and a group of desalination chambers in which a plurality of desalting chambers are adjacently arranged without a concentrating chamber therebetween, By passing the treated water treated in the chamber to the desalination chamber group, or by passing the treated water desalted in the desalination chamber group to a single desalination chamber and then performing desalination treatment. Therefore, it is possible to provide an electric regenerative desalination apparatus capable of enhancing the ability to remove weak anion components. Furthermore, since the desalting chamber groups are arranged adjacent to each other without a concentrating chamber therebetween, the concentrating chamber can be omitted for that amount, the operating voltage can be reduced, and the cost and the external shape can be reduced. It is more advantageous than the electric regeneration type desalination device.

Next, the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic configuration diagram showing an example of the electric regeneration type desalination apparatus according to the present invention, and the same configuration as the configuration shown in FIG. A cathode chamber 2 having a cathode 1 and an anode chamber 4 having an anode 3 are arranged so as to face each other, and between the cathode chamber 2 and the anode chamber 4, an anion exchange membrane 5 is provided on the cathode 1 side and on the anode 3 side. The concentrating chamber 8 formed by arranging the cation exchange membrane 6, the cation exchange membrane 6 on the cathode 1 side, the anion exchange membrane 5 on the anode 2 side, and the cation exchanger and anion inside. A single desalting chamber 7 formed by filling an ion exchanger, a second desalting chamber 72, an anion exchange membrane 5 arranged on both sides, and a first desalting chamber filled with an anion exchanger. The single desalting chamber 7 is formed by arranging the cathode chamber 2 or the concentrating chamber 8 on the cathode 1 side and the anode chamber 3 or the concentrating chamber 8 on the anode 2 side.
The deionization chamber group 70 includes a first deionization chamber 71 on the side of the anode 3 and a second deionization chamber 71.
Of the demineralization chamber 72, the demineralization chamber 7, the concentration chamber 8 and the cathode 1 An electric regenerative desalination apparatus according to the present invention is constituted by the cathode chamber 2 having the above and the anode chamber 4 having the anode 3.

A first desalination chamber 71 forming a desalination chamber group 70.
Is connected to the inlet of the second desalting chamber 72, and the outlet of the group of desalting chambers 70 (the outlet of the second desalting chamber 72 in this figure) is connected to the inlet of the single desalting chamber 7. ing. This order is not particularly limited, and as shown in FIG. 2, it is also possible to connect the outlet of the single desalination chamber 7 to the first or second desalination chamber forming the desalination chamber group 70. is there. In addition, the concentration chamber inlet water 12,
Although the cathode chamber inlet water 14 and the anode chamber inlet water 16 are separately introduced and discharged in FIG. 1, the anode chamber outlet water 17 is the same as the desalting chamber, but the concentration chamber inlet water 12 and the cathode chamber inlet water 14 are the same.
It is also possible to pass water in series to each concentrating chamber when used as or as having multiple concentrating chambers.
There is no particular limitation on how to flow it.

Here, in FIG. 1, the desalting chambers constituting the group 70 of desalting chambers are a desalting chamber in which anion exchange membranes are arranged on both sides and an anion exchanger is filled therein, and a cathode 1 side. The cation exchange membrane 6 and the anion exchange membrane 5 on the side of the anode 3 were placed and a desalting chamber filled with an anion exchanger and a cation exchanger was selected, but the quality of the inlet water 10 and the amount of water , Pure water 11
Depending on the target water quality, etc., the combination can be changed as appropriate. The single desalting chamber 7 and the second desalting chamber 72 are filled with an anion exchanger and a cation exchanger, and the first desalting chamber 71 is filled with an anion exchanger. Membrane 5
In the case of the single desalting chamber 7 and the second desalting chamber 72 in which the cation exchange membrane 6 and the cation exchange membrane 6 are arranged on both sides, when a direct current is applied between the electrodes, the shadow in the desalting chamber inlet water 10 is increased. Since the ions pass through the anion exchange membrane 5 to the concentrating chamber 8 and the cations pass through the cation exchange membrane 6 to the concentrating chamber 8, both the anion exchanger and the cation exchanger are transferred. While filling the desalting chamber has a deionizing effect, in the case of the first desalting chamber 71 having anion exchange membranes arranged on both sides, the desalting chamber inlet water 10
This is because the cations inside cannot pass through the anion exchange membrane 5, so that the continuous desalting effect cannot be exhibited even when the cation exchanger is filled inside.

Similarly, in the case of a desalting chamber in which the cation exchange membranes 6 are arranged on both sides, anions cannot pass through the cation exchange membrane 6, so that it is necessary to fill only the cation exchanger inside. Of course, in the case of a desalting chamber in which a bipolar membrane is arranged on the side of the anode 3 and a cation exchange membrane 6 is arranged on the side of the cathode 1, both the anions and the cations cannot pass through the bipolar membrane, so that the cation exchanger is placed on the cathode 1 side. In the case of a desalting chamber in which a bipolar membrane is arranged on the side and an anion exchange membrane 5 is arranged on the side of the anode 3, it is preferable to fill the anion exchanger. Further, it is desirable to fill the concentrating chamber 8 and the bipolar chambers 2 and 4 with the ion exchanger 9. The ion exchanger 9 is not particularly limited in its shape and type, but the concentrating chamber 8 is not limited to the positive chamber. It is effective to prevent precipitation by using both an ion exchanger and an anion exchanger, and disposing a cation exchanger on the cation exchange membrane side and an anion exchanger on the anion exchange membrane side.

The cathode chamber 2 is preferably filled with a cation exchanger when the desalting chamber is adjacent to it, and the anion exchanger when the concentrating chamber 8 is adjacent to the cathode chamber 2. It is preferable to fill the anion exchanger when the desalting chambers are adjacent to each other and the cation exchanger when the concentrating chambers 8 are adjacent to each other. The concentration chamber 8 and the bipolar chambers 2 and 4 can be partially filled with a spacer other than the ion exchanger, for example. The cathode chamber inlet water 14 is introduced into the cathode chamber 2, the anode chamber inlet water 16 is introduced into the anode chamber 4, the concentration chamber inlet water 12 is introduced into the concentration chamber 8, and the desalting chamber inlet water 10 is introduced into the first desalting chamber 71. By applying a direct current between the cathode 1 and the anode 3, the ion components contained in the demineralization chamber inlet water 10 move on the surface of the ion exchanger 9 in the direction of the potential, and the anions are negative. The ion exchange membrane 5 and the cations permeate the cation exchange membrane 6, move to the concentrated water in the concentrating chamber 8, the cathode water in the cathode chamber 2 and the anode water in the anode chamber 4 and are discharged out of the system, The deionized pure water 11 is produced.

The desalting chamber group 70 will be described in detail.
The anion component in the demineralization chamber inlet water 10 introduced into the first demineralization chamber 71 moves to the anode 3 side by the direct current applied to both electrodes, passes through the anion exchange membrane 5, and passes through the concentration chamber. Move into 8. Since the cation component cannot pass through the anion exchange membrane 5 arranged on the cathode side, it stays in the first deionization chamber 71. As a result, in the first desalting chamber 71, only the amount of anions is decreased, so that the pH is increased, and the weak anion component is ionized to be easily removed. Cathode 1
From the ion exchange membrane 5 disposed on the side, the residual anion component and OH ⁻ removed in the second deionization chamber 72 move to the first deionization chamber 71. By the action of OH ⁻ , the anion exchanger filled in the first desalting chamber 71 is regenerated, and the anion component in the desalting chamber inlet water 10 can be removed again. The treated water that has been desalted as described above in the first desalination chamber 71 is subsequently introduced into the second desalination chamber 72. The second deionization chamber 72 is filled with an anion exchanger and a cation exchanger, and the cation exchange membrane 6 is arranged on the cathode 1 side and the anion exchange membrane 7 is arranged on the anode 3 side. , Both the residual anion component and the cation component that could not be desalted in the second desalting chamber 72 are desalted and moved to the concentrating chamber 8.

The treated water desalted in the desalting chamber group 70 is
It is introduced into the single desalting chamber 7 and a final desalting process is performed. By the time it is introduced into the single desalting chamber 7, most of the anion components in the treated water have been removed, and a very small amount of ionic components are to be removed. The single deionization chamber 7 is filled with a cation exchanger and an anion exchanger, and the remaining cation components are ion-exchanged with the cation exchanger, and then the cations present on the cathode 1 side. After passing through the exchange membrane 6 and moving to the concentrating chamber 8, the remaining anion component is ion-exchanged with the anion exchanger, then passes through the anion exchange membrane 5 on the side of the anode 3 and moves to the concentrating chamber. To do. In the single desalting chamber 7 and the second desalting chamber 72, water is decomposed into H ⁺ and OH ⁻ by the movement of ions as well as the migration of ions, which is a cation exchanger in the desalting chamber. Since the anion exchanger is regenerated, it is not necessary to regenerate the ion exchanger with an acid or an alkali. In this way, the ion content in the desalting compartment inlet water 10 is sufficiently removed, and the pure water 11 is continuously supplied. Can be obtained.

In FIG. 1, the desalting chamber group 70 is a desalting chamber having the anion exchange membrane 5 and the cation exchange membrane 6 on both sides on the cathode side, and the anion exchange membrane 5 on both sides on the anode side. Two types of deionization chambers are arranged, and two deionization chambers are formed. However, there are no particular restrictions on the arrangement method and the types of deionization chambers, and the number of deionization chambers constituting the deionization chamber group 70 is not limited. There is no problem even if there are more than two rooms instead of two rooms. This can be appropriately selected depending on the ionic component in the water to be treated, the target water quality of the treated water, and the like. When a bipolar membrane is used in the desalting chambers that constitute the desalting chamber group 70, due to the characteristics of the bipolar membrane, H ⁺ and OH ⁻ are efficiently generated in the bipolar membrane at low voltage due to hydrolysis, H ⁺ regenerates the cation exchanger and OH ⁻ regenerates the anion exchanger, and it becomes possible to remove the ion component in the desalting compartment inlet water 10. Since the hydrolyzation can be efficiently generated, it is expected that the operating voltage will be further reduced when the bipolar membrane is used. Conventionally, the electric regeneration type desalination apparatus required a concentration chamber of the number of deionization chambers of ± 1, but as described above, it is composed of a plurality of desalination chambers without a concentration chamber interposed between them. By using the desalination chamber group according to the present invention, it is possible to reduce the number of concentrating chambers as compared with the conventional electric regenerative desalination apparatus, and the operating voltage can be reduced accordingly.

[0019]

EXAMPLES The present invention will be specifically described below with reference to examples. Example 1 The effect of the present invention will be described in comparison with a comparative example. As the test equipment, as shown in the flow chart of the test equipment of FIG. 3, as the demineralization chamber inlet water 10, the concentration chamber inlet water 1, the cathode chamber inlet water 14, and the anode chamber inlet water 16, Fujisawa city water is used as the activated carbon filter safety. What was pretreated with a filter and a reverse osmosis device was used, and the water quality thereof was a specific resistance of 0.25 MΩ · cm. In this example, an electric regenerative desalination apparatus having the configuration shown in FIG. 1 was used as the electric regenerative desalination apparatus in the test apparatus shown in FIG. 3, and the flow rate of the demineralizing chamber inlet water 10 was 75 L / h and concentrated. The flow rate of the chamber inlet water 12 is 10 L / h, the flow rate of the cathode chamber inlet water 14 and the flow rate of the anode chamber inlet water 16 are 10 L / h, and a DC current of 0.4 A is applied to the cathode 1 and the anode 3 for operation. I went.

The electric regeneration type desalination apparatus has an electrode area of 640c.
m ² , the desalting chamber is 3 chambers, the concentrating chamber is 1 chamber, the cathode chamber and the anode chamber are provided at both ends, and the desalting chamber 7 and the second desalting chamber 72 forming the desalting chamber group 70 are provided. Is a cation exchange non-woven fabric, an anion exchange non-woven fabric, a cation exchange spacer, an anion exchange spacer, the first formed with an anion exchange membrane 5 on both sides
The desalting chamber 71 was filled with an anion exchange nonwoven fabric and an anion exchange spacer. In addition, the anion exchanger and the cation exchanger are inside the concentrating chamber, the cathode chamber is a spacer that is not electrically conductive with the cation exchanger, and the anode chamber is not electrically conductive with the anion exchanger. Filled with spacers. As a result of operating under the above conditions, pure water with a specific resistance of 17.6 MΩ · cm 11
Was continuously produced, the water quality of pure water was significantly improved compared to the comparative example below, the operating voltage was reduced to 58 V, and the carbon dioxide removal rate and silica removal rate were 99% or more. The removal rate of was also greatly improved.

COMPARATIVE EXAMPLE 1 As a comparative example, an electric regenerative desalting apparatus having the structure shown in FIG. 5 was used, the flow rate of the demineralizing chamber inlet water 10 was 75 L / h, and the flow rate of the concentrating chamber inlet water 12 was 20 L / h. The flow rate of the cathode chamber inlet water 14 and the anode chamber inlet water 16 was set to 10 L / h, and a DC current of 0.4 A was applied to the cathode 1 and the anode 3 for operation. The electric regeneration type desalination device has an electrode area of 640c.
m ² , the desalting chamber is 3, the concentrating chamber is 2, and the cathode chamber and the anode chamber are provided at both ends, and the anion exchanger and the cation exchanger are provided in the desalting chamber and the concentrating chamber as the cathode chamber. The cation exchanger is filled in the anode chamber with the anion exchanger. As a result of operating under the above conditions, pure water 11 having a specific resistance of about 14.4 MΩ · cm was continuously produced. In this operation, the operating voltage is 6
6 V, carbon dioxide removal rate 94%, and silica removal rate 88%.

[0022]

According to the electric regeneration type desalination apparatus of the present invention,
As described above, it becomes possible to enhance the ability to remove the weak anion component in the water to be treated and to reduce the operating voltage.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an example of an electric regeneration type desalination apparatus of the present invention.

FIG. 2 is a schematic configuration diagram showing another example of the electric regeneration type desalination apparatus of the present invention.

FIG. 3 is a flow chart of the test apparatus used in the examples.

FIG. 4 is a schematic configuration diagram showing an example of a conventional electric regenerative desalination apparatus.

FIG. 5 is a schematic configuration diagram showing another example of a conventional electric regeneration desalination apparatus.

[Explanation of symbols]

1: Cathode, 2: Cathode chamber, 3: Anode, 4: Anode chamber, 5: Anion exchange membrane, 6: Cation exchange membrane, 7: Single desalting chamber,
8: Concentration chamber, 9: Ion exchanger, 10: Demineralization chamber inlet water,
11: Pure water, 12: Concentration chamber inlet water, 13: Concentration chamber outlet water, 14: Cathode chamber inlet water, 15: Cathode chamber outlet water, 16:
Anode chamber inlet water, 17: Anode chamber outlet water, 70: Desalination chamber group,
71: first desalination chamber, 72: second desalination chamber

Continued front page    F-term (reference) 4D006 GA17 HA43 HA44 HA47 JA30A                       JA30C JA44A JA58A MA03                       MA13 MA14 MA15 PA01 PB06                 4D061 DA03 DB13 EA09 EB04 EB13                       EB17 FA08

Claims (5)

[Claims] 1. A cathode chamber having a cathode and an anode chamber having an anode, wherein a cation exchange membrane is disposed on the anode side and an anion exchange membrane is disposed on the cathode side between the cathode chambers. One or more concentrating chambers, the following (a) to (e) desalting chambers, (a) a cation exchange membrane on the cathode side and an anion exchange membrane on the anode side, and an ion exchanger filled inside Deionization chamber, (b) cation exchange membranes are placed on both sides, and anion exchange membrane is placed inside (c) both sides, and anion exchange membrane is placed on both sides. Deionization chamber, (d) a cation exchange membrane on the cathode side, a bipolar membrane on the anode side, and a deionization chamber filled with an ion exchanger inside, (e) a bipolar membrane on the cathode side, and an anion side on the anode side. An ion exchange membrane is arranged, and a desalting chamber having an ion exchanger filled therein, and a plurality of desalting chambers of at least one type, On either side of the desalting chamber, any one of the above-mentioned single desalting chambers in which any one of a concentrating chamber, an anode chamber or a cathode chamber is arranged, and any one or more of the desalting chambers without a concentrating chamber therebetween. An electric regenerative desalination apparatus having one or more desalting chamber groups in which a plurality of salt chambers are arranged adjacent to each other, the outlet of the desalting chamber group and the inlet of the single desalting chamber, or An electric regenerative desalination apparatus, wherein an outlet of the single desalination chamber and an inlet of the desalination chamber group are connected. 2. In the desalination chamber group arranged without the concentration chamber, the treated water introduced into the first desalination chamber constituting the desalination chamber group is the first desalination chamber. 2. The electric regenerative desalination system according to claim 1, wherein the chamber is connected to the final desalination chambers constituting the group of desalination chambers so as to be desalted by sequentially passing water in series. apparatus. 3. The single desalination chamber and the desalination chamber group are respectively provided in plurality, and the plurality of single desalination chambers or the desalination chamber groups are respectively provided with treated water in parallel or in series. At least one of them is connected in series, and the other is connected in series or in parallel. The electric regenerative desalination apparatus according to claim 1, wherein the desalination apparatus is supplied. 4. The ion exchanger filled in the desalting chamber of (a) is an anion exchanger, a cation exchanger, or an ion exchanger of an anion exchanger and a cation exchanger. The ion exchanger packed in the desalting chamber of (b) is a cation exchanger, the ion exchanger packed in the desalting chamber of (c) is an anion exchanger, and ), The in-exchanger packed in the desalting chamber is a cation exchanger,
The ion exchanger filled in the desalting chamber of (e) is an anion exchanger.
The electric regenerative desalination apparatus described. 5. The ion exchanger is an ion exchanger comprising ion exchange fibers having ion exchange groups introduced by a radiation graft polymerization method. The ion exchanger comprising the ion exchange fibers is a non-woven fabric or a woven fabric, And a mesh-shaped spacer, The electric regenerative desalination apparatus according to any one of claims 1 to 4, wherein: