JP2001334269A - Bathtub water circulation softening device and bathtub water circulation soft water bath - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bathtub water circulation softening apparatus and a bathtub water circulation softening bath which minimize the amount of water for regeneration without using a chemical such as salt for the regeneration of ion exchange resin. With the goal. SOLUTION: The bathtub water circulation / softening apparatus of the present invention includes a circulation pump 14 for circulating bathtub water W, a water softening unit containing ion exchange resin and removing a hardness component of bathtub water W, and a water softening unit. And a bath tub water circulation / softening apparatus provided with a circulation pump provided with a circulation pump 14 and a water softening unit, wherein the electrodialysis means comprises a monovalent cation selective cation exchange membrane 4. And an anode dilution chamber 11 attached to the water softening section via a monovalent anion-selective anion-exchange membrane 3. The chamber 11 and the cathode-side dilution chamber 10 are each provided with an electrode for performing electrodialysis.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bath water circulation softening apparatus using an ion exchange resin and an electrodialysis means, and a bath water circulation softening bath provided with the bath water circulation softening apparatus.

[0002]

2. Description of the Related Art Conventionally, in a water softening device for softening raw water such as bathtub water, for example, Na type is used as an ion exchange resin, whereby Ca ²⁺ which is a hardness component contained in raw water is used. And Mg ²⁺ are replaced with Na ⁺ to make the water soft.

[0003] However, this water softener is used for a long time.
Then, the exchange group Na of the ion exchange resin ⁺Is Ca²⁺,Also
Is Mg²⁺And finally all the ion exchange resins
Ca^{Two +}Or Mg²⁺If it is replaced with
Since it becomes impossible to remove the contained hardness component,
Regeneration of the ion exchange resin to restore this ability
Is being done.

Therefore, in this type of water softening apparatus,
In many cases, softening by removing the hardness component in the raw water and regeneration of the ion exchange resin for recovering the capacity are alternately performed. For the regeneration of the ion exchange resin, the substituted C
Since a ²⁺ and Mg ²⁺ need to be replaced with the original Na ⁺ again,
Generally, salt water is used. Drugs such as hydrochloric acid may be used.

A conventional technique for regenerating an ion-exchange resin using salt water is described in, for example, JP-A-7-27021.
As described in JP-A No. 4 (KOKAI) No. 4, the ion exchange resin is generally regenerated with salt water, and the regenerated waste liquid is generally discarded as it is. FIG. 3 shows an apparatus for regenerating this ion exchange resin. FIG. 3 is a configuration diagram of a conventional ion exchange resin regenerating apparatus.

In FIG. 3, reference numeral 61 denotes a raw water line for supplying raw water to a water softener 64 to be described later, and reference numeral 62 denotes a treated water line for supplying a treated liquid after water softening treatment to a subsequent demand point. is there. 63 is a drain discharge line for draining the processing solution during regeneration, 64 is a water softener for removing hardness components, 65 is a processing vessel containing ion-exchange resin, and 66 is a control valve for water softening and regeneration. Is automatically switched. 67
Is a salt water tank for accommodating salt water for regeneration of a water softener, 68 is a salt water line extending from the salt water tank 67 for introducing and replenishing salt water, and 69 is a partition member, such as a net or a perforated plate. It can retain the salt for regeneration without obstructing the flow of water. 70 is a regenerating salt for regenerating the ion exchange resin, 71 is a control device for switching the control valve 66 to a predetermined operation state, 78 is an arithmetic processing device, and 78 is a salt water tank based on a change in salt water pressure. The salt water level in 67 is obtained. Reference numeral 79 denotes a salt water pressure detector for detecting a change in salt water pressure in the salt water tank 67;
0 is a reference water level detector.

At the time of regeneration of the ion exchange resin, the arithmetic processing unit 78 calculates the optimum amount of salt water to be sent from the salt water tank 67 to the processing vessel 65 based on signals from the salt water pressure detector 79 and the reference water level detector 80. The control is performed by the control device 71 controlling the salt water line 68 based on this. The regeneration control device 71 is switched to connect the control valve 66 of the salt water line 68 to the processing vessel 65 or the drain discharge line 63. When the salt water is switched to pass through the processing vessel 65, the ion exchange resin in the processing vessel 65 is regenerated by the salt water. At this time, the salt water containing a large amount of the hardness component liberated from the ion exchange resin is drained as a recycle waste liquid. It is discharged out of the system through the discharge line 63.

[0008] Regarding the regeneration of ion-exchange resins, as a technique for reducing the amount of salt and the amount of regenerated water, see JP-A-11-12.
There is also a technique for recycling a recycled waste liquid as disclosed in JP-A-8755. FIG. 4 shows a technique for recycling the recycled waste liquid.
FIG. 4 is a configuration diagram of a conventional ion exchange resin regenerating apparatus. Here, 81 is a resin cylinder filled with ion exchange resin, 8
Reference numeral 2 denotes a control valve for switching a flow path formed inside in each step such as a water passing step and a regeneration step. Reference numeral 83 denotes a raw water line for supplying raw water to a water softener. Further, 84 is a soft water line for supplying the treatment liquid after the water softening treatment to a subsequent demand point, 85 is a salt water tank for containing salt water for regeneration of a water softener, 86 is a salt water line, and is a salt water line. A drain line extends to introduce salt water, and a drain line 87 drains water from the processing solution during regeneration. Also, 8
Reference numeral 8 denotes a regeneration circulation line for collecting the regeneration waste liquid from the drain line 87 and leading it to the salt water tank 85. 89 is a signal line, and 90 is a controller.

During regeneration of the ion exchange resin, the controller 90 controls the control valve 8 via a signal line 89.
2 to send the reproducing start signal, the first solenoid valve V _1, the second solenoid valve V _2, the first solenoid valve V ₁ is opened, the second solenoid valve V ₂ and outputs a signal to close. As a result, the control valve 82 switches the flow path and enters the regeneration state. And
By the action of an ejector (not shown) provided in the control valve 82, the salt water in the salt water tank 85 passes through the flow path in the control valve 82 via the salt water line 86 to regenerate the ion exchange resin in the resin cylinder 81. Then, it is drained after the treatment. Then, the wastewater again passes through the flow path in the control valve 82 and is discharged to the outside of the system via the drainage line 87.

[0010] Here, the reproduction process is started a predetermined time set in advance elapses after the controller 90, the first solenoid valve V _1, to the second solenoid valve V _2, the first solenoid valve V ₁ closed , A signal for opening the second solenoid valve V ₂ is output to the drain line 87.
The waste water discharged out of the system through the recirculation line 88 flows into the salt water tank 85 through the regeneration circulation line 88. The inflowed wastewater contains high concentration of Na ⁺ , and is mixed with the saltwater in the saltwater tank 85, and is used again for regeneration as the saltwater.

Further, in addition to the above-described technology, for example, Japanese Patent Application Laid-Open No. 7-68256 discloses a technology in which an ion exchange resin is regenerated with acidic water generated by electrolysis. This is to reduce the amount of salt without using salt water.

By the way, raw water containing a hardness component includes various types of water, and bathtub water often contains a hardness component. When using a bath filled with normal bath water with such a high hardness component, there is always a feeling of tingling on the skin as compared to soft water, and recently, bath water is circulated,
A bath water circulation soft water bath has been proposed, which is filtered and then softened to give a moist feeling to the skin.
In this bath tub water circulation soft water bath, it is necessary to regenerate the water softener used therein, but a large amount of salt as a regenerant and water for regeneration are required.

[0013]

SUMMARY OF THE INVENTION By the way, Japanese Patent Application Laid-Open No. 7-27 is disclosed.
The regeneration technique disclosed in Japanese Patent No. 0214 and the salt reduction technique disclosed in Japanese Patent Application Laid-Open No. H11-128755 also disclose the salt water drainage in the early stage of regeneration when regenerating an ion exchange resin having adsorbed hardness components. The amount of salt used for regeneration increases with the number of regenerations,
A large amount of salt must be regularly injected. Moreover,
There is also a problem that the amount of water consumed for regeneration also increases, and it has been required to reduce the amount of salt used as a regenerant and the amount of water required for regeneration.

Further, as disclosed in Japanese Patent Application Laid-Open No. 7-68256, even when the ion exchange resin is regenerated with the acidic water generated by the electrolysis, the H ⁺ concentration in the acidic water is reduced by the ordinary electrolysis. Because of the thinness, there was a problem that the amount of water was large even though the amount of salt was reduced.

The bathtub water circulation softening bath, which circulates and softens the bathtub water, also requires a large amount of salt and regenerated water for regenerating the water softening device, resulting in an increase in maintenance costs and inexpensive use in ordinary households. There was a problem that maintenance was troublesome.

Accordingly, an object of the present invention is to provide a bathtub water circulation / softening apparatus in which the amount of water for regeneration is reduced as much as possible without using a chemical such as salt for regeneration of the ion exchange resin.

Further, the present invention provides a bathtub water circulation soft water bath which can reduce the amount of water for regeneration as much as possible without using a salt or the like for the regeneration of the ion exchange resin, and can perform maintenance easily at low cost. The purpose is to:

[0018]

In order to solve these problems, the bath water circulation water softening apparatus of the present invention comprises a water softening section containing an ion exchange resin and removing a hardness component of the bath water, and a water softening section. A bath water circulation water softening device provided with an attached electrodialysis means, wherein the electrodialysis means comprises an anode-side dilution chamber attached to the water softening section via a monovalent cation-selective cation exchange membrane. A cathode-side dilution chamber attached to the water softening section via a valent anion-selective anion exchange membrane; and an anode-side dilution chamber and a cathode-side dilution chamber each provided with an electrode for performing electrodialysis. It is characterized by being.

Thus, the amount of water for regeneration can be reduced as much as possible without using a salt or other chemical for regeneration of the ion exchange resin.

Further, the bath tub water circulation softening bath of the present invention comprises:
The apparatus is provided with the bathtub water circulating water softening device, wherein the bathtub water is circulated in a circulating water channel to soften the water.

As a result, the amount of water for regeneration can be reduced as much as possible without using chemicals such as salts for regeneration of the ion exchange resin, and maintenance can be performed at low cost and easily.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION The invention described in claim 1 of the present invention comprises a circulating pump for circulating bath water, a water softening section containing an ion exchange resin and removing a hardness component of the bath water, An electrodialysis unit attached to the water softening unit, and a bathtub water circulation water softening device having a circulation pump and a circulation water channel provided with a water softening unit, wherein the electrodialysis unit is a monovalent cation selective cation exchange. An anode-side dilution chamber attached to the water softening unit via the membrane, and a cathode-side dilution chamber attached to the water softening unit via the monovalent anion-selective anion exchange membrane, the anode-side dilution chamber and Electrodes for electrodialysis are provided in the cathode side dilution chamber, respectively.Since the bathtub circulation water softening device is characterized in that a voltage is applied to the electrodes of the electrodialysis means so as to have predetermined polarities. Then, generated in the anode side dilute chamber was H ⁺ i And ions migrate to the water softening unit through monovalent anion-selective anion-exchange membrane ^- down is moved to the water softening unit through monovalent cation-selective cation exchange membrane, OH generated at the cathode side dilution chamber The ion exchange resin can be regenerated in the water softening section without using a chemical. The ion exchange resin can be regenerated in a short time, the amount of regenerated water is small, and no regenerant is required, which is advantageous in terms of maintenance.

According to a second aspect of the present invention, there is provided a bath tub water circulation softening apparatus according to the first aspect, wherein the inside of the water softening section is partitioned by a diaphragm and divided into an anode-side concentration chamber and a cathode-side concentration chamber. Since it is a device, H ⁺ ions generated in the anode side dilution chamber immediately regenerate the ion exchange resin in the anode side concentration chamber, and OH ⁻ ions generated in the cathode side dilution chamber immediately convert the ion exchange resin in the cathode side concentration chamber. Reproduction can be performed effectively in a short time.

According to a third aspect of the present invention, as the ion exchange resin, a cation exchange resin is accommodated in the anode-side enrichment chamber, and an anion exchange resin is accommodated in the cathode-side enrichment chamber. Since the bath water circulation water softening device according to claim 2, H ⁺ ions generated in the anode side dilution chamber immediately regenerate the cation exchange resin in the anode side concentration chamber, and OH ⁻ ions generated in the cathode side dilution chamber are reduced. The anion exchange resin is immediately regenerated in the cathode-side concentrating chamber, and effective regeneration can be performed in a short time.

According to a fourth aspect of the present invention, there is provided the bath tub water circulation softening apparatus according to the second or third aspect, wherein a plurality of the water softening sections are provided in series. Effective reproduction can be performed.

According to a fifth aspect of the present invention, there is provided a bathtub for containing bathtub water, and a bathtub water circulation softening device according to any one of the first to fourth aspects, wherein the bathtub water is circulated through a circulation channel. Bathtub water circulation softening bath characterized by water softening by bathtub water circulation water softening device, so no chemical is used for regeneration of ion exchange resin, the amount of water for regeneration can be reduced, and maintenance is inexpensive. And easily.

(Embodiment 1) A bath tub water circulation softening apparatus and a bath tub water circulation soft water bath according to Embodiment 1 of the present invention will be described below with reference to FIG. FIG. 1 is a configuration diagram of a bath tub water circulation softening device and a bath tub water circulation soft water bath according to Embodiment 1 of the present invention.

In FIG. 1, reference numerals 1 and 2 denote a pair of electrodes for performing electrodialysis, 3 denotes a monovalent anion-selective anion-exchange membrane which transmits monovalent anions but hardly transmits polyvalent anions, Reference numeral 4 denotes a monovalent cation selective cation exchange membrane that transmits monovalent cations but hardly transmits polyvalent cations. A voltage is applied so that the electrode 1 becomes a cathode and the electrode 2 becomes an anode. 5 is an anion exchange resin for exchanging Cl ^- and NO ₃ ^- ions for OH ^- ions, 6 is a cation exchange resin for exchanging Mg ⁺ and Ca ²⁺ ions for H ⁺ ions, and 7 is a diaphragm. Reference numerals 8 and 9 denote respective concentration chambers separated by a diaphragm 7. The concentration chamber 8 (cathode-side concentration chamber) is filled with an anion exchange resin 5, and the inside of the concentration chamber 9 (anode-side concentration chamber). Is filled with a cation exchange resin 6. The first and second embodiments include the concentration chambers 8 and 9, the anion exchange resin 5 and the cation exchange resin 6.
Of the water softening unit. Reference numerals 10 and 11 denote dilution chambers provided in the water softening section, and reference numeral 12 denotes a net for preventing anion exchange resin 5 and cation exchange resin 6 from flowing out of the concentration chambers 8 and 9. The electrodialysis means of the first embodiment includes a dilution chamber 1
0, 11, electrodes 1 and 2, a monovalent anion-selective anion exchange membrane 3, a monovalent cation-selective cation exchange membrane 4, and a power source (not shown). Dilution chamber 10
The OH ^- ions generated in the (cathode-side dilution chamber) permeate the monovalent anion-selective anion exchange membrane 3 and move into the concentration chamber 8, whereupon the inside of the dilution chamber 10 is acidified, and the dilution chamber 11 The H ⁺ ions generated in the (anode-side dilution chamber) permeate the monovalent cation-selective cation exchange membrane 4 and move into the concentration chamber 9 to alkalinize the dilution chamber 11. In the concentration chambers 8, 9, the anion exchange resin 5 and the cation exchange resin 6 are regenerated by the action of H ⁺ ions and OH ^- ions. And the inside of the concentration chambers 8 and 9 becomes almost neutral.

Next, the surroundings of the circulation channel will be described.
Is a bathtub containing bathtub water W, 14 is a circulating pump that sends bathtub water W to the water softening device and is softened, 15 is a water suction port that sucks the circulated bathtub water W, 16, 17, 18, 19, and 2
Numerals 0 and 21 are circulation channels for water softening. Reference numeral 22 denotes a flow path for discharging waste water when the anion exchange resin 5 and the cation exchange resin 6 are regenerated, 23 denotes an outlet for discharging the waste water, and 24 denotes a bath for returning the softened bath water W to the bath 13. It is a spout. Reference numerals 25, 26, and 27 denote switching valves that switch the flow path during operation and regeneration, and reference numeral 28 denotes a flow control valve. The flow paths 16, 17, 18 and the water inlet 15 and the water outlet 24 constitute a circulation channel of the bathtub water circulation / softening apparatus of the first embodiment. Similarly, the flow paths 19, 20, and 21 constitute a water supply / drainage passage for the electrodialysis means of the first embodiment.

Next, the operation and details of the operation when the bathtub water circulation softening apparatus and the bathtub water circulation softening bath of the first embodiment are operated will be described. The operation of the bathtub water circulation water softening device is composed of two modes, a normal operation for water softening and a regeneration operation for restoring the ability of the ion exchange resin.
One is alternately repeated with the operation stop mode added as necessary. The operation is performed in a normal operation mode in which water is first softened. First, the circulation pump 14
The bathtub water W absorbed from the water inlet 15 by the
And is supplied to the flow path 18 and is divided into the concentration chambers 8 and 9. The enrichment chambers 8 and 9 are formed by being separated by a diaphragm 7. The separated bathtub water W is converted into H ^{2 +} by the cation exchange resin 6 so that Ca ²⁺ and Mg ²⁺ which are hardness components in the bath water W are H ^+. the ion-exchanged by the anion exchange resin 5 is an anion in the bath water W Cl ^- and nO ₃ ^- ions OH ^- to the ion-exchanged, merges through a mesh 12 which is impervious to resin, the switching valve 25 Is returned to the bathtub 13 via At this time, in the concentration chamber 9 having the cation exchange resin 6, as a result of the ion exchange, the pH of the bath water W becomes acidic. In the concentration chamber 8 having the anion exchange resin 5, anions such as Cl ⁻ , HCO ₃ ⁻ , SO ₄ ²⁻ in the bath water W and OH ⁻ in the anion exchange resin 5 are mixed. As a result of the ion exchange, the net 12 becomes alkaline and does not pass through the anion exchange resin 5.
And the protons H ⁺ and OH ⁻ react to form water and almost return to neutrality. Further, the ion-exchanged bathtub water W is returned to the bathtub 13 from the water outlet 24 through the switching valve 25. If such circulation of the bathtub water W is performed for about 20 minutes, the bathtub water W is completely softened.

Next, a regeneration mode using electrodialysis is performed. In the regeneration mode, after the water softening is performed in the normal operation mode, the switching valves 26 and 27 are opened from the closed state, and the switching valve 2 is opened.
This is done by closing 5 from open. Here, bathtub water W is divided into flow paths 18, 19, and 20, and the flow rate is controlled by flow rate control valve 28. Regeneration is performed by electrodialysis by separating and removing the hardness components adsorbed by the anion exchange resin 5 and the cation exchange resin 6 from the exchange groups of each ion exchange resin. A voltage is applied to each of the pair of electrodes 1 and 2 constituting the electrodialysis means so as to have a predetermined polarity, and H ⁺ generated at the anode is concentrated through a monovalent cation selective cation exchange membrane 4 into a concentration chamber. 9 and Ca ²⁺ and M, which are hardness components attached to the exchange groups in the cation exchange resin 6.
g ²⁺ and the H ⁺ is a proton ion exchange, the flow regulating valve 28 through a release removed Ca ^{2 +} and Mg ²⁺ the channel 2
2. Drain from the outlet 23. Also, it performed in the same manner drainage cathode, through the monovalent anion-selective anion-exchange membrane 3 OH produced by the cathode concentrating compartment 8 ^- move the, moving OH ^- and anion exchange resin C in 5
l ^- and NO ₃ ^- ions by ion-exchange, was separated off Cl ^-
And NO ₃ ^- ions with recycled water, such as, the flow rate regulating valve 2
8. Drain from the outlet 23 through the flow path 22. At this time, the amount of regenerated wastewater drained through the flow path 22 is about the volume of the water softening part, and is very small.

Although the bath water circulation water softening apparatus according to the first embodiment is described as having one water softening section, a plurality of water softening sections are provided between the anode dilution chamber and the cathode dilution chamber. It is also preferable to connect them consecutively because the reproduction time can be further reduced.

As described above, the bathtub water circulation softener according to the first embodiment is used.
The water dispenser is softened without using chemicals by means of electrodialysis.
The part can regenerate the ion exchange resin. Ion exchange
The regeneration of the exchange resin can be done in a short time, and the amount of regenerated water is small.
No need to use a regenerant,
It is advantageous in terms of aspect. In addition, H generated in the anode side dilution chamber ⁺
Ions immediately regenerate ion exchange resin in the anode side enrichment chamber
OH generated in the cathode side dilution chamber^-Ions are concentrated on the cathode side
Immediately regenerate the ion exchange resin in the shrinking chamber
Effective reproduction can be performed. This bathtub water circulation soft
Maintenance of bathtub water circulation soft water bath using waterification equipment
However, it is inexpensive, and can be operated automatically and has little trouble.

(Embodiment 2) A bath tub water circulation softening apparatus and a bath tub water circulation soft water bath according to a second embodiment of the present invention will be described with reference to FIG. FIG. 2 is a configuration diagram of a bath tub water circulation softening device and a bath tub water circulation soft water bath according to Embodiment 2 of the present invention.

In FIG. 2, reference numerals 31 and 32 denote a pair of electrodes for performing electrodialysis, 33 denotes a monovalent anion-selective anion exchange membrane which transmits monovalent anions but hardly transmits polyvalent anions, Reference numeral 34 denotes a monovalent cation selective cation exchange membrane that transmits monovalent cations but hardly transmits polyvalent cations. A voltage is applied so that the electrode 31 functions as a cathode and the electrode 32 functions as an anode. 35 is a weakly basic anion exchange resin for exchanging Cl ^- and NO ₃ ^- ions for OH ^- ions, and 36 is M
Weakly acidic cation exchange resin for exchanging g ⁺ and Ca ²⁺ ions for H ⁺ ions, 37 and 38 are weakly basic anion exchange resins 3
5, a net that prevents and supports the outflow of the weakly acidic cation exchange resin 36. Reference numerals 39 and 40 denote concentration chambers, respectively, in which the weakly basic anion exchange resin 35 is accommodated, and in the concentration chamber 40, the weakly acidic cation exchange resin 36 is contained.
Is housed. The concentration chambers 39 and 40, the weakly basic anion exchange resin 35 and the weakly acidic cation exchange resin 36,
The main body of the water softening unit according to the second embodiment is configured. 4
Reference numerals 1 and 42 denote dilution chambers attached to the water softening section. OH ^- ions generated in the dilution chamber 41 (cathode-side dilution chamber)
The permeation through the monovalent anion-selective anion exchange membrane 33 into the concentration chambers 39 and 40 to acidify the dilution chamber 41, and the H ⁺ ions generated in the dilution chamber 42 (anode-side dilution chamber) Moves through the monovalent cation-selective cation exchange membrane 34 into the concentration chambers 39 and 40, and the inside of the dilution chamber 42 is alkalized. The electrodialysis means of the second embodiment includes a dilution chamber 41,
42, electrodes 31, 32, monovalent anion selective anion exchange membrane 33, monovalent cation selective cation exchange membrane 3
4, and a power source (not shown). In the concentration chambers 8, 9, the anion exchange resin 5 and the cation exchange resin 6 are regenerated by the action of H ⁺ ions and OH ^- ions. And the inside of the concentration chambers 8 and 9 becomes almost neutral.

Next, the surroundings of the circulation channel will be described.
Is a bathtub containing bathtub water W, 44 is a circulating pump that sends bathtub water W to the water softening device and is softened, 45 is a water suction port that sucks the circulated bathtub water W, and 46, 47, and 48 are for softening. This is a circulation channel. Reference numerals 49, 50, and 51 denote flow paths that constitute water supply / drain paths for the electrodialysis means, and reference numeral 52 denotes a flow path that discharges wastewater during regeneration. Reference numeral 53 denotes a discharge port for discharging waste water when the weakly basic anion exchange resin 35 and the weakly acidic cation exchange resin 36 are regenerated, and 54 denotes a water discharge port for returning the softened bathtub water W to the bathtub 43. In addition,
The channels 46, 47, 48, the water inlet 45, and the outlet 53 constitute a circulating water channel of the bathtub water circulation / softening apparatus of the second embodiment. Reference numerals 55, 56, and 57 denote switching valves that switch the flow path during operation and regeneration, and reference numeral 58 denotes a flow control valve.

Next, the operation and details of the operation of the bath tub water circulation softening apparatus and the bath tub water circulation soft water bath of the second embodiment will be described. As in the first embodiment, the operation of the bath water circulation water softening apparatus is composed of two modes, a normal operation for water softening and a regeneration operation for restoring the ability of the ion exchange resin, and these two modes are added as necessary. The operation is repeated alternately with respect to the operation stop mode. Driving is
First, a normal operation mode in which water is softened is performed. The water softening by ion exchange is performed by the circulation pump
The bathtub water W absorbed from 5 passes through a flow path 46 and a flow path 48
And supplied to the concentration chamber 39. The differences from the first embodiment are the arrangement of the ion exchange resin and the type of the ion exchange resin. In the first embodiment, the anion exchange resin 5 and the cation exchange resin 6 are arranged in parallel via the diaphragm 7 (see FIG. 1). However, in the second embodiment, the weakly basic anion exchange resin is used. A resin 35 and a weakly acidic cation exchange resin 36 are arranged in series. A weakly basic anion exchange resin 35 is disposed on an upstream net 37, and a downstream net 38 is provided.
Is provided with a weakly acidic cation exchange resin. Therefore, the supplied bath water W is weakly basic anion exchange resin 35.
The Cl is an anion in the bath water W ^- and NO ₃ ^- ions OH ^- to the ion-exchange, becomes alkaline, through a network 37 that is impervious to resin into the concentrating compartment 40. Next, the bath water W supplied to the weakly acidic cation exchange resin 36 absorbs Ca ²⁺ and Mg ²⁺ as hardness components by the weakly acidic cation exchange resin 36 and is ion-exchanged to H ^+. Returned to sex. The ion-exchanged bath water W is supplied to the switching valve 55.
Then, the water is returned to the bathtub 43 from the water discharge port 54. If such circulation of bath water W is performed for about 20 minutes, bath water W
Is completely softened.

Next, a regeneration mode using electrodialysis is performed. In the regeneration mode, after the water softening is performed in the normal operation mode, the switching valves 56 and 57 are opened from the closed state, and the switching valve 55 is opened.
Is performed by changing from the open state to the closed state. Here, the bathtub water W is divided into the flow paths 48, 49, and 50, and the flow rate is controlled by the flow rate control valve 58. Regeneration is performed by electrodialysis by separating and removing the hardness component adsorbed by the weakly basic anion exchange resin 35 and the weakly acidic cation exchange resin 36 from the exchange groups of each ion exchange resin. A voltage is applied to each of the pair of electrodes 31 and 32 constituting the electrodialysis means so as to have a predetermined polarity, and H ⁺ generated at the anode is passed through a monovalent cation selective cation exchange membrane 34 to a dilution chamber. 42
And then moved to the concentration chamber 40, where the weak acid cation exchange resin 3
Ca ²⁺ and Mg ²⁺ which are the hardness components attached to the exchange groups in No. 6
Is ion-exchanged with H ⁺ which is a proton, and Ca ²⁺ and Mg ²⁺ separated and removed are passed through the flow control valve 58 through the flow path 5.
2. Drain from the outlet 53. Also conducted in the same manner drainage cathode, through the monovalent anion-selective anion-exchange membrane 33 OH generated at the cathode to the concentrating compartment 39 from the dilution chamber 41 ^- to move the, moving OH ^- and Yin By ion-exchanging Cl ^- and NO ₃ ^- ions in the ion-exchange resin and separating and removing ions of Cl ^- and NO ₃ ^- etc. together with regenerated water,
The water is discharged from the discharge port 53 through the flow control valve 58 and the flow path 52.

As described above, the bath tub water circulation softening apparatus and bath tub water circulation soft water bath of the second embodiment can regenerate the ion exchange resin in the water softening section without using a chemical by the electrodialysis means. Ion exchange resin can be regenerated in a short time,
Since the amount of regenerated water is small and no regenerant is required, it is advantageous in terms of maintenance. Since no diaphragm is used, the cost can be reduced. The bathtub water circulation soft water bath using this bathtub water circulation softening device is inexpensive to maintain, can be automatically operated, and has little trouble.

[0040]

As described above, in the bath tub water circulation water softening apparatus of the present invention, H ⁺ ions generated in the anode side dilution chamber by the electrodialysis means pass through the water softening section through the monovalent cation selective cation exchange membrane. OH ^- ions generated in the cathode side dilution chamber move to the water softening section through the monovalent anion selective anion exchange membrane, and regenerate the ion exchange resin in the water softening section without using chemicals be able to. The ion-exchange resin can be regenerated in a short time, the amount of regenerated water is small, and the use of a regenerating agent is not required, so it is inexpensive and advantageous in terms of maintenance.

Further, the bath water circulation soft water bath of the present invention does not use a chemical for the regeneration of the ion exchange resin, the amount of water for the regeneration can be made small, the maintenance can be performed at low cost and the operation can be performed automatically. .

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a bathtub water circulation softening device and a bathtub water circulation soft water bath according to Embodiment 1 of the present invention.

FIG. 2 is a configuration diagram of a bath tub water circulation softening device and a bath tub water circulation soft water bath according to a second embodiment of the present invention.

FIG. 3 is a configuration diagram of a conventional ion exchange resin regeneration device.

FIG. 4 is a configuration diagram of a conventional ion exchange resin regenerating apparatus.

[Explanation of symbols]

 1, 2 electrodes 3 monovalent anion-selective anion-exchange membrane 4 monovalent cation-selective cation-exchange membrane 5 anion-exchange resin 6 cation-exchange resin 7 diaphragm 8, 9 concentration room 10, 11 dilution room 12 net DESCRIPTION OF SYMBOLS 13 Bathtub 14 Circulation pump 15 Water inlet 16, 17, 18, 19, 20, 21, 22 Channel 23 Outlet 24 Water outlet 25, 26, 27 Switching valve 28 Flow control valve 31, 32 Electrode 33 Monovalent anion selection Anion exchange membrane 34 Monovalent cation selective cation exchange membrane 35 Weakly basic anion exchange resin 36 Weakly acidic cation exchange resin 37,38 Net 39,40 Concentration room 41,42 Dilution room 43 Bathtub 44 Circulation pump 45 water inlet 46, 47, 48, 49, 50, 51, 52 flow path 53 outlet 54 water outlet 55, 56, 57 switching valve 58 flow control valve W bathtub water

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference) 2D005 FA00 4D006 GA17 HA47 JA30A JA42A JA43A JA44A JA53A JA56A JA64A KA17 KA31 KB11 MA03 MA13 MA14 MB07 PA10 PB07 PB25 PB26 PB27 PC56 4D025 AA08 AB19 BA10 BA10 BA10 DA10 EB01 EB04 EB13 EB17 EB19 FA08

Claims (5)

[Claims] A circulating pump for circulating bath water; a water softening unit containing an ion exchange resin to remove a hardness component of the bath water; an electrodialysis means attached to the water softening unit; A circulating water channel provided with a pump and the water softening unit, and a bathtub water circulation water softening device provided with a water supply / drainage channel for the electrodialysis means, wherein the electrodialysis means includes a monovalent cation selective cation exchange membrane. An anode-side dilution chamber attached to the water softening unit through,
A cathode-side dilution chamber provided to the water softening section via a monovalent anion-selective anion exchange membrane; and an electrode for performing electrodialysis in each of the anode-side dilution chamber and the cathode-side dilution chamber. A bathtub water circulation water softening device characterized by having a water bath. 2. The bathtub water circulating water softening apparatus according to claim 1, wherein the inside of the water softening section is partitioned by a diaphragm and divided into an anode-side concentration chamber and a cathode-side concentration chamber. 3. The ion exchange resin according to claim 2, wherein a cation exchange resin is accommodated in the anode-side enrichment chamber, and an anion exchange resin is accommodated in the cathode-side enrichment chamber. Bath water circulation water softener. 4. The bathtub water circulation / softening apparatus according to claim 2, wherein a plurality of said water softening sections are provided in series. 5. A bathtub for containing bathtub water, and a bathtub water circulation / softening device according to any one of claims 1 to 4, wherein the bathtub water is circulated in the circulation water channel and the bathtub water circulation / softening device is provided. Bathtub water circulation softening bath characterized by softening.