JP3729349B2 - Electric regenerative desalination equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electric regeneration type desalination apparatus, and more particularly, to a relatively small electric regeneration type desalination apparatus having a high ability to remove weak anion components.
[0002]
[Prior art]
As a conventional pure water production method, pure water is produced by passing deionization chamber inlet water through a container filled with an ion exchange resin and exchanging ions in the demineralization chamber inlet water with H ⁺ and OH ⁻ ions. Ion exchange methods are known.
However, in this ion exchange method, when the exchange capacity of the ion exchange resin is saturated, it is necessary to regenerate the ion exchange capacity using an acid or an alkali according to the type of the ion exchange resin. The regeneration operation of the ion exchange resin is complicated, and has a problem that a large amount of acid and alkali must be stored and handled, and careful attention is required for disposal, and the equipment becomes large.
On the other hand, in recent years, an electric regenerative desalination apparatus that regenerates ion exchangers by electricity and continuously produces pure water has been developed. As shown in FIG. 4, this is a device that removes ions in the desalination chamber inlet water 10 by moving them to the concentration chamber outlet water 13 and the catholyte and anolyte by a DC power source applied to both ends of the device. A desalting chamber formed by disposing an anion exchange membrane 5 and a cation exchange membrane 6 between a cathode chamber 2 having a cathode 1 and an anode chamber 4 having an anode 3, and between the cathode chamber 2 and the anode chamber 4. 7 and a concentrating chamber 8, and at least the desalting chamber 7 is filled with an ion exchanger 9.
[0003]
Here, the ion exchanger 9 is any ion exchanger as long as it has an ion exchange function, such as an ion exchange resin, an ion exchange fiber, an ion exchange nonwoven fabric into which an ion exchange group is introduced by a graft polymerization method, and a spacer. Alternatively, the anion exchanger and the cation exchanger may be filled in a single layer, a mixed layer, or a multilayer.
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 desalination chamber inlet water 10 is introduced into the desalting chamber 7. By applying a direct current between the anode 3 and the anode 3, ions contained in the desalting chamber inlet water 10 move on the surface of the ion exchanger 9 in the direction of the potential, and the anions are converted into anion exchange membranes. 5. The cation passes through the cation exchange membrane 6 and moves to the concentrated water in the concentration chamber 8, the catholyte in the cathode chamber 2, and the anolyte in the anode chamber 4. The pure water 11 is manufactured by ion treatment.
[0004]
Since the ion exchanger 9 filled in the desalting chamber 7 is continuously regenerated by H ⁺ and OH ⁻ generated by hydrolysis, there is no need to regenerate with acid or alkali. 11 can be manufactured continuously (Japanese Patent No. 1784243, Japanese Patent No. 2751090, 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 from one desalination chamber is introduced into the other desalination chamber. Regenerative desalination apparatuses have also been developed (Japanese Patent Laid-Open Nos. 2001-239270 and 2001-327971).
[0005]
Further, in the relatively small electric regenerative desalination apparatus, in addition to the water flow method shown in FIG. 4, as shown in FIG. By doing so, there is also a method of increasing the desalting capacity by increasing the desalting area.
In such a relatively small electric regenerative desalination apparatus, the concentrating chamber inlet water 12 is also passed through each concentrating chamber 8 in series, or the cathode chamber outlet water 15 is passed through the concentrating chamber inlet water 12 or the anode chamber inlet. Sometimes used as water 16.
In these electric regeneration type desalination apparatuses, the flow directions of the concentrating chamber inlet water 12, the cathode chamber inlet water 14, the anode chamber inlet water 16, and the desalting chamber inlet water 10 may be parallel flow or counter flow. The water flow method is not particularly limited.
Further, both the cathode chamber 2 and the anode chamber 4 may be the concentrating chamber 8 or the desalting chamber 7.
[0006]
In the conventional electric regeneration type desalting apparatus, it is generally known that the ability to remove weak anion components such as carbonic acid and silica is inferior to the ability to remove other ions.
These weak anion components are known to have a slightly improved removal rate if DC current is excessively applied to an electric regeneration-type desalination apparatus, but even in this case, the weak anion components are sufficiently removed. The power consumption per unit flow rate becomes large.
For this reason, an electric regeneration type desalination apparatus in which a cartridge polisher made of an ion exchange resin is installed in the subsequent stage to perform ion exchange is configured in multiple stages, and after the desalting is performed by the first electric regeneration type desalination apparatus, the second Treatments such as further desalting using an electric regeneration type desalting apparatus are performed as necessary.
However, if such a treatment is performed, the installation area increases, the number of devices increases, and the price increases.
[0007]
[Problems to be solved by the invention]
In view of the above prior art, the present invention improves the above-mentioned weak anion component removal performance and can sufficiently remove the weak anion component, particularly in a relatively small electric regeneration type desalination apparatus. It is an object to provide a salt device.
[0008]
[Means for Solving the Problems]
In order to solve the above problems, the present invention has a cathode chamber having a cathode and an anode chamber having an anode, and a cation exchange membrane on the anode side and an anion exchange membrane on the cathode side between the two electrode chambers. One or more concentrating chambers configured by arranging a desalting chamber of the following (a) to (e), (a) a cation exchange membrane on the cathode side, and an anion exchange membrane on the anode side, A desalting chamber filled with an ion exchanger inside, (b) a cation exchange membrane placed on both sides, a desalting chamber filled with an ion exchanger inside, (c) an anion exchange membrane placed on both sides, A desalting chamber filled with an ion exchanger inside, (d) a cation exchange membrane on the cathode side, a bipolar membrane on the anode side, and a desalting chamber filled with an ion exchanger inside, (e) on the cathode side One or more of a bipolar membrane and a desalting chamber in which an anion exchange membrane is arranged on the anode side and the inside is filled with an ion exchanger A plurality of desalting chambers, and on either side of the desalting chamber, any one of the concentrating chamber, the anode chamber, or the cathode chamber is disposed, and the concentrating chamber is interposed therebetween. A demineralization chamber group in which any one or more types of demineralization chambers are arranged adjacent to each other without any intervening electric regenerative demineralization apparatus, each having one or more, and an outlet of the demineralization chamber group; The inlet of the single desalting chamber or the outlet of the single desalting chamber and the inlet of the desalting chamber group are connected.
[0009]
In the electric regenerative desalination apparatus, the desalting chamber group disposed without a concentrating chamber in between is treated water introduced into the first desalting chamber constituting the desalting chamber group. It is preferable that the single desalting chamber and the desalting chamber are connected to each other from the desalting chamber to a final desalting chamber constituting the group of desalting chambers by sequentially passing water in series. A plurality of groups are respectively deployed, and a plurality of single demineralization chambers or demineralization chamber groups that are respectively deployed are connected so as to supply treated water in parallel or in series. The connection of the to-be-treated water between the desalting chamber and the desalting chamber group may be such that at least one of them is supplied in series and the other is supplied in series or in parallel. In the desalting chamber, 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 filled in the desalting chamber of (b) is a cation exchanger, and the ion exchanger filled in the desalting chamber of (c) is an anion exchanger, The in exchanger to be filled in the desalting chamber of (d) is a cation exchanger, and the ion exchanger to be filled in the desalting chamber of (e) is preferably an anion exchanger, The ion exchanger is an ion exchanger made of an ion exchange fiber into which an ion exchange group is introduced by a radiation graft polymerization method, and the ion exchanger made of the ion exchange fiber is a nonwoven fabric or a woven cloth, and a mesh-like spacer It can be.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
According to the present invention, an electric having a single desalination chamber in which concentrating chambers or polar chambers are disposed on both sides, and a desalting chamber group in which a plurality of desalting chambers are disposed adjacent to each other without interposing a concentrating chamber therebetween. In the regenerative desalination equipment, the treated water treated in the single desalting chamber is passed through the desalting chamber group, or the treated water desalted in the desalting chamber group is passed through the single desalting chamber. It is possible to provide an electric regeneration type desalting apparatus capable of increasing the ability to remove weak anion components by hydrating and further performing a desalting treatment.
Furthermore, since the desalting chambers are arranged adjacent to each other without interposing the concentrating chambers, the concentrating chambers can be omitted, the operation voltage can be reduced, and the conventional method is reduced in cost and outer shape. This is more advantageous than an electric regenerative desalting apparatus.
[0011]
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 an 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 to face each other, and an anion exchange membrane 5 is disposed on the cathode 1 side between the cathode chamber 2 and the anode chamber 4 and on the anode 3 side. The concentration chamber 8 formed by disposing 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 first desalting chamber 7 formed by filling an ion exchanger, a second desalting chamber 72, an anion exchange membrane 5 disposed on both sides, and a first anion exchanger filled therein. The single desalting chamber 7 is formed by arranging the cathode chamber 2 or the concentration chamber 8 adjacent to the cathode 1 side and the anode chamber 3 or the concentration chamber 8 adjacent to the anode 2 side. The salt chamber group 70 includes a first desalting chamber 71 on the anode 3 side, a second desalting chamber 72 on the cathode 1 side, and adjacent to each other without interposing a concentration chamber. The electric regenerative desalination according to the present invention comprises the single desalting chamber 7, the desalting chamber group 70, the concentration chamber 8, the cathode chamber 2 having the cathode 1, and the anode chamber 4 having the anode 3. The device is configured.
[0012]
The outlet of the first desalting chamber 71 forming the desalting chamber group 70 is connected to the inlet of the second desalting chamber 72, and the outlet of the desalting chamber group 70 (in this figure, the second desalting chamber 72 of the second desalting chamber 72 is connected). The outlet) is connected to the inlet of the single desalting chamber 7.
This order is not particularly limited, and it is possible to connect the outlet of the single desalting chamber 7 to the first or second desalting chamber forming the desalting chamber group 70 as shown in FIG. is there. Further, the concentrating chamber inlet water 12, the cathode chamber inlet water 14, and the anode chamber inlet water 16 are separately introduced and discharged in FIG. 1, but the anode chamber outlet water 17 is supplied to the concentrating chamber inlet as in the desalination chamber. When used as water 12 or cathode chamber inlet water 14 or having a plurality of concentrating chambers, it is possible to pass water in series with each concentrating chamber, and there is no particular limitation on the flow method. .
[0013]
Here, in FIG. 1, as a desalting chamber constituting the desalting chamber group 70, a desalting chamber in which an anion exchange membrane is arranged on both sides and an anion exchanger is filled inside, and a cation exchange on the cathode 1 side are provided. A demineralization chamber in which an anion exchange membrane 5 is arranged on the membrane 6 and the anode 3 side and an anion exchanger and a cation exchanger are filled inside is selected. Depending on the target water quality of 11, 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. In the case of the single desalting chamber 7 and the second desalting chamber 72 in which the membrane 5 and the cation exchange membrane 6 are arranged on both sides, when a direct current is applied between the electrodes, The anions of the anion exchange membrane 5 pass through the anion exchange membrane 5 to the concentration chamber 8, and the cations pass through the cation exchange membrane 6 to the concentration chamber 8; In the case of the first demineralization chamber 71 in which an anion exchange membrane is disposed on both sides, the cation in the demineralization chamber inlet water 10 has an anion effect when both are filled in the demineralization chamber. This is because the ion-exchange membrane 5 cannot be passed, so that the continuous desalting effect cannot be exhibited even if the cation exchanger is filled inside.
[0014]
Similarly, in the case of a desalination chamber in which cation exchange membranes 6 are arranged on both sides, since anions cannot pass through the cation exchange membrane 6, the inside should be filled only with a cation exchanger. In the case of a desalination chamber in which a bipolar membrane is disposed on the 3 side and a cation exchange membrane 6 is disposed on the cathode 1, the anion and cation cannot pass through the bipolar membrane, so a cation exchanger is disposed on the cathode 1 side. In the case of a desalting chamber in which the membrane is provided with an anion exchange membrane 5 on the anode 3 side, it is preferable to fill the membrane with an anion exchanger.
Further, it is desirable that the concentration chamber 8 and the bipolar chambers 2 and 4 are also filled with the ion exchanger 9, and the shape and type of the ion exchanger 9 are not particularly limited. Using both an ion exchanger and an anion exchanger, placing a cation exchanger on the cation exchange membrane side and an anion exchanger on the anion exchange membrane side is effective in preventing precipitation.
[0015]
The cathode chamber 2 is preferably filled with a cation exchanger when the desalting chamber is adjacent, and an anion exchanger when the concentration chamber 8 is adjacent. The anode chamber 4 has a desalting chamber. It is preferable to fill an anion exchanger when the adsorbing chambers are adjacent to each other and a cation exchanger when the concentrating chamber 8 is adjacent.
The concentration chamber 8 and the bipolar chambers 2 and 4 can be partially filled with, for example, a spacer other than the ion exchanger.
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 desalination chamber inlet water 10 is introduced into the first desalination chamber 71. By applying a direct current between the cathode 1 and the anode 3, the ion component contained in the desalination chamber inlet water 10 moves on the surface of the ion exchanger 9 in the direction of the potential, and the anion is anion. The ion exchange membrane 5 and the cation pass through the cation exchange membrane 6, move to the concentrated water in the concentration 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.
[0016]
The desalination chamber group 70 will be described in detail. The anion content in the desalination chamber inlet water 10 introduced into the first desalination chamber 71 is moved to the anode 3 side by the direct current applied to the two electrodes, It passes through the ion exchange membrane 5 and moves into the concentration chamber 8. Since the cation content cannot pass through the anion exchange membrane 5 disposed on the cathode side, it remains in the first desalting chamber 71. Thereby, since only the anion content decreases in the first desalting chamber 71, the pH is increased, and the weak anion component is easily ionized and removed. From the ion exchange membrane 5 arranged on the cathode 1 side, the remaining anion content and OH ⁻ removed in the second desalting chamber 72 move to the first desalting chamber 71. By the action of OH ⁻ , the anion exchanger filled in the first desalting chamber 71 is regenerated, and the anion content in the desalting chamber inlet water 10 can be removed again.
The treated water that has been subjected to the desalting treatment in the first desalting chamber 71 is then introduced into the second desalting chamber 72. The second desalting chamber 72 is filled with an anion exchanger and a cation exchanger, and the cation exchange membrane 6 is disposed on the cathode 1 side and the anion exchange membrane 7 is disposed on the anode 3 side. Both the remaining anion and cation that could not be desalted in the second desalting chamber 72 are desalted and moved to the concentration chamber 8.
[0017]
The treated water desalted in the desalting chamber group 70 is introduced into the single desalting chamber 7 and a final desalting treatment is performed. When introduced into the single desalting chamber 7, the anion component in the treated water has been almost removed, and a very small amount of ionic component is to be removed.
The single desalting chamber 7 is filled with a cation exchanger and an anion exchanger, and the remaining cation is ion-exchanged with the cation exchanger and then present on the cathode 1 side. After passing through the exchange membrane 6 and moving to the concentration chamber 8, the remaining anion component exchanges ions with the anion exchanger and then passes through the anion exchange membrane 5 on the anode 3 side and moves to the concentration chamber. To do.
In the single desalting chamber 7 and the second desalting chamber 72, in addition to the movement of ions, water is decomposed into H ⁺ and OH ⁻ by hydrolysis, which is a cation exchanger in the desalting chamber, In order to regenerate the anion exchanger, there is no need to regenerate the ion exchanger with acid or alkali. In this way, the ion content in the desalting chamber inlet water 10 is sufficiently removed, and the pure water 11 is continuously removed. Can be obtained.
[0018]
In FIG. 1, the desalination chamber group 70 is a desalination chamber in which the anion exchange membrane 5 and the cation exchange membrane 6 are arranged on both sides on the cathode side, and a deionization chamber in which the anion exchange membrane 5 is arranged on both sides on the anode side. There are two types of salt chambers, two demineralization chambers, but there are no particular restrictions on the arrangement method and the type of desalination chambers, and the number of demineralization chambers constituting the desalination chamber group 70 is also two. There is no problem even if there are more than three 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 constituting the desalting chamber group 70, H ⁺ and OH ⁻ are efficiently generated by water decomposition at a low voltage due to the characteristics of the bipolar membrane, H ⁺ regenerates the cation exchanger and OH ⁻ regenerates the anion exchanger, so that the ion content in the desalting chamber inlet water 10 can be removed.
Since hydrolysis can be generated efficiently, it is expected that the operating voltage will be further reduced when a bipolar membrane is used.
In the electric regeneration type desalination apparatus, the number of concentration chambers of ± 1 in the conventional desalting chamber is required, but as described above, it is composed of a plurality of desalting chambers without interposing a concentration chamber. By using such a desalting chamber group, the number of concentrating chambers can be reduced as compared with the conventional type of electric regeneration type desalting apparatus, and the operating voltage can be reduced accordingly.
[0019]
【Example】
Hereinafter, the present invention will be specifically described by way of examples.
Example 1
The effect of the present invention will be described based on comparison with a comparative example. As shown in the flow chart of the test apparatus in FIG. 3, Fujisawa city water is used as an activated carbon filter as the desalination chamber inlet water 10, the concentration chamber inlet water 1, the cathode chamber inlet water 14, and the anode chamber inlet water 16. What was pre-processed with the filter and the reverse osmosis membrane apparatus was used, and the water quality was a specific resistance of 0.25 MΩ · cm.
In the present embodiment, the electric regeneration type desalination apparatus in the test apparatus shown in FIG. 3 uses the electric regeneration type desalination apparatus having the configuration shown in FIG. 1, and the flow rate of the desalination chamber inlet water 10 is 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, respectively, and a DC current of 0.4 A is applied to the cathode 1 and the anode 3 for operation. Went.
[0020]
The electric regenerative desalting apparatus has an electrode area of 640 cm ² , three desalting chambers, one concentrating chamber, a cathode chamber and an anode chamber at both ends, and a desalting chamber 7 and a desalting chamber group 70 are formed. The second demineralization chamber 72 includes a cation exchange nonwoven fabric, an anion exchange nonwoven fabric, a cation exchange spacer, an anion exchange spacer, and a first desalination chamber formed on both sides with an anion exchange membrane 5. 71 was filled with an anion exchange nonwoven fabric and an anion exchange spacer.
Also, an anion exchanger and a cation exchanger are provided in the concentration chamber, a spacer having no conductivity with the cation exchanger is provided in the cathode chamber, and no anion exchanger and conductivity are provided in the anode chamber. Filled with spacers.
As a result of operating under the above conditions, pure water 11 having a specific resistance of 17.6 MΩ · cm was continuously produced. The quality of pure water was significantly improved compared to the following comparative example, and the operating voltage was reduced to 58 V. Further, both the carbonic acid removal rate and the silica removal rate were 99% or more, and the removal rate of weak anions was greatly improved.
[0021]
Comparative Example 1
As a comparative example, an electric regenerative desalination apparatus having the configuration shown in FIG. 5 was used, the flow rate of the desalination chamber inlet water 10 was 75 L / h, the flow rate of the concentration chamber inlet water 12 was 20 L / h, and the cathode chamber inlet water 14 The operation was performed by applying a direct current of 0.4 A to the cathode 1 and the anode 3 at a flow rate and a flow rate of the anode chamber inlet water 16 of 10 L / h, respectively.
The electric regenerative desalination apparatus has an electrode area of 640 cm ² , three desalting chambers, two concentrating chambers, a cathode chamber and an anode chamber at both ends, and an anion exchanger in the desalting chamber and the concentrating chamber. The cathode chamber is filled with a cation exchanger and the anode chamber is filled with an 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 operation voltage was 66 V, the carbonation removal rate was 94%, and the silica removal rate was 88%.
[0022]
【The invention's effect】
According to the electric regeneration type desalination apparatus of the present invention, as described above, it is possible to increase the ability to remove weak anion components in the water to be treated and to reduce the operating voltage.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram showing an example of an electric regeneration type desalination apparatus according to 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 flowchart 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 regenerative 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: Desalination 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: desalting chamber group, 71: first desalting chamber, 72: second desalting chamber

Claims (5)

One or more concentrating chambers each having 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 two electrode chambers. And the following desalting chambers (a) to (e), (a) a cation exchange membrane on the cathode side, an anion exchange membrane on the anode side, and a desalting chamber filled with an ion exchanger inside, (B) a desalting chamber in which cation exchange membranes are arranged on both sides and filled with an ion exchanger inside, (c) a desalting chamber in which an anion exchange membrane is arranged on both sides and filled with an ion exchanger, (D) A cation exchange membrane on the cathode side, a bipolar membrane on the anode side, and a desalting chamber filled with an ion exchanger inside. (E) A bipolar membrane on the cathode side and an anion exchange membrane on the anode side A plurality of one or more kinds of desalting chambers, each of which is filled with an ion exchanger. A single desalting chamber in which any one of the concentrating chamber, the anode chamber, or the cathode chamber is disposed, and a plurality of any one or more types of desalting chambers adjacent to each other without interposing a concentrating chamber. An electrically regenerative desalination apparatus having at least one demineralization chamber group arranged at the outlet, the outlet of the demineralization chamber group and the inlet of the single desalination chamber, or the single desalination chamber An electric regenerative desalination apparatus, wherein an outlet of the desalination chamber group and an inlet of the desalination chamber group are connected. In the desalination chamber group arranged without using a concentrating chamber therebetween, the water to be treated introduced into the first desalination chamber constituting the desalination chamber group is transferred from the first desalination chamber to the desalination chamber. 2. The electric regenerative desalination apparatus according to claim 1, wherein the electric regenerative desalination apparatus is connected so as to be desalted by sequentially passing water in series up to a final desalting chamber constituting the chamber group. A plurality of the single desalting chambers and the desalting chamber groups are provided, and the plurality of single desalting chambers or the desalting chamber groups are connected to supply the water to be treated in parallel or in series, respectively. In addition, the connection of water to be treated between a plurality of single desalting chambers and a group of desalting chambers is configured so that at least one of them is supplied in series and the others are supplied in series or in parallel. The electric regenerative desalination apparatus according to claim 1 or 2, characterized in that: 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 filled in the salt chamber is a cation exchanger, the ion exchanger filled in the desalting chamber of (c) is an anion exchanger, and the desalting chamber of (d) The in-exchanger filled in is a cation exchanger, and the ion exchanger filled in the desalting chamber of (e) is an anion exchanger. 3. The electric regenerative desalination apparatus according to 3. The ion exchanger is an ion exchanger made of an ion exchange fiber into which an ion exchange group is introduced by a radiation graft polymerization method, and the ion exchanger made of the ion exchange fiber is a nonwoven fabric or a woven cloth, and a mesh-like spacer The electric regenerative desalination apparatus according to any one of claims 1 to 4, wherein:

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