JPH10314748A - Sterilization apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently produce hypochlorite ion which is a sterilization component. SOLUTION: While being parted from each other by a cation exchange membrane 20, a pair of electrodes 18, 19 are installed in the inside of an electrolytic bath 8. When a water purifying apparatus 1 is started to purify bath water and voltage is applied between the electrode 18 and the electrode 19, hydroxide ion and chlorine ion are reacted in an electrolytic chamber 21 in which the electrode 18 (a negative electrode side) is installed to produce hypochlorite ion which is a sterilization component. Since hydroxide ion and chlorine ion existing in the electrolytic chamber 21 cannot move to an electrolytic chamber 22 in which the electrode 19 (a positive electrode side) is installed, hydroxy ion and chlorine ion are prevented from being decomposed to oxygen gas and hydrogen gas, respectively. Consequently, hypochlorite ion can efficiently be generated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sterilizer for sterilizing tap water or bath water by electrolysis.

[0002]

2. Description of the Related Art Conventionally, as one of sterilization methods for sterilizing tap water in a water purifier, a bath water purification device, or the like, an electrolyte such as salt (NaCl) is added to tap water as shown in FIG. A sterilization method is known in which a voltage is applied to a pair of electrodes 52 and 53 disposed inside an electrolysis tank 50 with an anion exchange membrane 51 interposed therebetween, and electrolysis is performed to perform sterilization.

In such an electrolytic cell 50, the electrode 5
When a voltage is applied to the electrodes 2 and 53, the following electrolysis is performed on the electrodes 52 and 53, respectively. In the electrolysis chamber 54 in which the electrode 53 on the positive electrode side is disposed, hydroxide ions (OH ⁻ ) are decomposed as shown by the chemical formula (1), and a relatively high concentration of hydrogen ions (H ⁺ ) causes a strong acid. As shown by chemical formulas (2) and (3), chlorine water (Cl ⁻ ) once becomes chlorine gas, and then hypochlorite (HOCl), which is a sterilizing component, is generated. You. Tap water is sterilized by the strongly acidic water and hypochlorous acid thus generated. 4OH ⁻ + 4e ⁺ → O ₂ ↑ + H ₂ O (1) 2Cl ⁻ + 2e ⁺ → Cl ₂ ↑ (2) H ₂ O + Cl ₂ → HOCl + H ⁺ + Cl ⁻ (3)

[0004]

However, when hypochlorous acid is generated in the electrolytic cell 50 having the above-described structure, the chlorine contained in the tap water in the electrolytic chamber 54 in which the positive electrode 53 is disposed. Once the ions become chlorine gas, they react with water to form hypochlorous acid, so chlorine ions, which are the chlorine source of hypochlorous acid, are easily consumed and are not sufficient to sterilize tap water. There was a problem that it was difficult to generate hypochlorous acid efficiently.

[0005] When the pair of electrodes is the electrolytic cell 50 provided with the pair of electrodes separated by the anion exchange membrane 51 as described above, in the electrolytic chamber 54 provided with the electrode 53 on the positive electrode side, strong acidic water and While chlorous acid is generated, the following chemical formula (4) is obtained in the electrolytic chamber 55 in which the negative electrode 52 is disposed.
The hydrogen ions are decomposed into hydrogen gas as shown by (2), the concentration of hydroxide ions is relatively increased, and alkaline ionized water is generated.

2H ⁺ + 2e ⁻ → H ₂ ↑ (4) Therefore, in order to maintain strong acidity in the electrolytic chamber 54,
It is necessary to completely separate the strongly acidic water generated in the electrolytic chamber 54 and the alkaline ionized water generated in the electrolytic chamber 55, and an outflow pipe 50a for allowing the strongly acidic water and the alkaline ionized water to flow out of the electrolytic cell 50 , 50b must be provided, and there is a problem that the piping structure becomes complicated.

In view of the above, the present invention has been made in view of the above points, and in a sterilizing apparatus for performing sterilization by electrolysis, it is possible to efficiently generate sterilizing components and to have a simple piping structure. It is intended to provide a sterilizer.

[0008]

According to the present invention, when a voltage is applied between the electrodes (18, 19), tap water is electrolyzed. At this time, hydroxide ions and chloride ions present in the electrolytic chamber (21) in which the negative electrode (18) is disposed react with each other to generate hypochlorite ions, which are sterilizing components. Each electrode (18, 1
Since the electrolysis chambers (21, 22) in which 9) are disposed are separated by the cation exchange membrane (20), each electrolysis chamber (21, 22) is separated.
The hydroxide ions and chlorine ions present in 22) cannot move between the electrolysis chambers (21, 22).
Therefore, hydroxide ions and chlorine ions existing in the electrolytic chamber (21) in which the negative electrode (1819) is disposed cannot move to the electrolytic chamber (22) in which the positive electrode (19) is disposed. Therefore, they are not decomposed into chlorine gas and oxygen gas, respectively. That is, it is possible to efficiently generate hypochlorite ions without consuming chlorine ions, which are a chlorine supply source of hypochlorite ions.

Further, the water passing through each of the electrolysis chambers (21, 22) is merged and then flown out of the sterilizer (8). Therefore, each of the electrolysis chambers (21, 2) is discharged by one outflow pipe (8b).
The water that has passed through 2) can be drained from the sterilizer (8). Therefore, the outflow pipe (8b) can have a simple piping structure. In the electrolytic chamber (22) in which the positive electrode (19) is disposed, a part of oxygen generated by the decomposition of hydroxide ions and a part of chlorine ions react to form hypochlorous acid. Ions are generated. Subsequently, the hypochlorite ion reacts with the hydrogen ion to produce hypochlorite, which is a sterilizing component. Therefore, even if the water that has passed through each of the electrolysis chambers (21, 22) is merged on the downstream side of the cation exchange membrane (20), sufficient hypochlorous acid and hypochlorous acid to sterilize tap water are provided. Ions can be obtained.

Further, according to the invention of claim 2, chloride ions contained in the body fluid of the user are dissolved in the bath water. Therefore, in particular, by applying the present invention to the bath water purification device (1) for purifying bath water, it is not necessary to add an electrolyte as a supply source of chlorine of hypochlorite ions. According to the third and fourth aspects of the present invention, the photocatalyst (17) excited by ultraviolet rays adsorbs and decomposes substances having a small molecular diameter such as odor components and inorganic salts in bath water,
Hypochlorous acid and hypochlorite ions generated in the electrolysis chambers (21, 22) are decomposed by ultraviolet rays.
The concentration of hypochlorous acid and hypochlorite ion does not rise too much, and the concentration of hypochlorous acid and hypochlorite ion in the bath water is adjusted to an appropriate range where the growth of various bacteria is suppressed. Can be maintained.

Further, according to the invention of claim 5, by inverting the polarity of the voltage applied to the electrodes by the polarity switching device, components contained in the bath water that are likely to precipitate as salts are removed, and the bath tub (7) is removed. ) Can be discharged outside.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a bath water purification device (hereinafter abbreviated as a water purification device) provided in a home or business bath will be described below. [First Embodiment] A first embodiment will be described with reference to FIGS. Note that the solid arrows in FIGS. 1 and 2 indicate the movement of each ion generated by the electrolysis.
Open arrows indicate the flow of bath water.

The water purifying apparatus 1 has a purifying tank 2 provided with a purifying tube 3 which is a purifying section for purifying bath water in a bath tub 7 which has become contaminated as a user takes a bath or as time passes.
(Shown by a two-dot chain line in FIG. 1), a supply pipe 4 which is a bath water supply means for supplying bath water to the purification column 3, and a discharge unit for discharging purified water purified in the purification column 3 to the bath 7. A discharge pipe 5, a drain pipe 6 for discharging water passing through the purification column 3 to the outside of the bath 7, and an electrolytic tank 8 as a sterilizer are provided.

Inside the purification tank 2 having a substantially rectangular shape, a purification column 3, an electrolytic tank 8, a circulation pump 9, a heater 10,
A functional component such as a three-way valve 11 serving as a flow path switching unit is housed therein. Although not shown, the septic tank 2 is provided with an operation panel, and is provided with operation buttons for operating functional components. In addition, the electrolytic cell 8, the circulation pump 9, the heater 1
The operation of the three-way valve 11 is controlled by control means (not shown).

At an upstream end of the supply pipe 4, a suction unit 4a for sucking bath water from the bathtub 7 into the supply pipe 4 is provided.
Is attached. The suction unit 4a includes a suction port (not shown) formed at a position immersed in bath water stored in the bathtub 7, a filter (not shown) provided downstream of the suction port, and a filter (not shown). Also has a check valve (not shown) provided on the downstream side.

On the downstream side of the suction unit 4a, the supply pipe 4 penetrates the wall of the purification tank 2 and reaches the inside of the purification tank 2, and the downstream end thereof is connected to the inflow pipe 3a of the purification column 3. In addition, inside the septic tank 2, an electrolytic tank 8 for electrolyzing bath water, a circulation pump 9 for pumping the bath water, and a heater 10 for adjusting the temperature of the bath water are attached to the supply pipe 4 in order from the upstream side. ing.

A three-way valve 11 is provided at the downstream end of the outflow pipe 3b of the purification column 3. The outflow pipe 3b is connected to the discharge pipe 5 and the drain pipe 6 via a three-way valve 11, and the flow path of water flowing out of the outflow pipe 3b is switched by the three-way valve 11. In the present embodiment, when the three-way valve 11 is on, the water flowing out of the outflow pipe 3b flows into the drain pipe 6 connected to the sewer pipe (not shown), and when the three-way valve 11 is off. If there is, the water flowing out of the outflow pipe 3b is sent to the discharge pipe 5. At the downstream end of the discharge pipe 5, a discharge unit 5a having a discharge port (not shown) formed at a position immersed in bath water stored in the bathtub 7 is attached.

The purifying tube 3 is formed by stacking three filter medium casings filled with a filter medium 15 in a substantially cylindrical container 14 made of metal. The filter medium 15 is made of barley stone, which is a porous natural stone. Microorganisms (for example, genus Bacillus) for purifying bath water form colonies on the surface of the filter stone 15 and adhere in a clustered state. Organic substances such as descaling and slimming in water are adsorbed and decomposed by aerobic microorganisms attached to the surface.

The filter medium casing has a substantially cylindrical shape with an open top, and the bottom surface is meshed so that water can pass through. Among the filter medium casings housed inside the container 14, a portion serving as an axial center of the filter medium casing arranged at the top and the second stage includes:
An ultraviolet lamp 16 having a double tube structure is arranged, and a photocatalyst 17 having TiO ₂ , ZnO, ZnS or the like supported on the structure is arranged around the ultraviolet lamp 16. Further, a filter medium 15 is filled so as to surround the photocatalyst 17. In addition, only the filter medium 15 is filled in the filter medium casing arranged at the lowermost stage.

Inside the electrolytic cell 8, a pair of electrodes 18 and 19 made of titanium platinum and connected to a power supply (not shown) are arranged separated by a cation exchange membrane 20. The inside of the electrolytic cell 8 is covered by the cation exchange membrane 20 with the electrodes 1.
An electrolysis chamber 21 in which the electrodes 8 are disposed and an electrolysis chamber 22 in which the electrodes 19 are disposed. The electrolysis tank 8 has an inflow pipe 8a for uniformly flowing bath water from the supply pipe 4 into the electrolysis chambers 21 and 22, and an outflow pipe 8b for flowing bath water passing through the electrolysis chambers 21 and 22 from the electrolysis tank 8. Is provided. Note that the electrolysis chamber 21 and the electrolysis chamber 22 are not completely separated by the cation exchange membrane 20, and the electrolysis chamber 21 and the electrolysis chamber 22 communicate with each other on the outflow pipe 8b side, that is, on the downstream side. In addition, in order to prevent a reduction in electrolysis efficiency, the electrodes 18,
The polarity of the voltage applied to the switch 19 is switched between positive and negative at predetermined time intervals.

Next, the operation of the present embodiment will be described. In a bath for home use or business use, when a user takes a bath, dirt such as scale and propagated germs is generated in the bath water. The water purification device 1 removes the organic matter from the components of the dirt of the bath water,
Bath water is purified by adsorption and decomposition by the microorganisms attached to 5.

When the user turns on the operation switch and the water purification device 1 starts the purification operation, the circulating pump 9 and the ultraviolet lamp 16 are turned on by the control means. Further, when the water purification device 1 starts the purification operation, the concentration between the electrode 18 and the electrode 19 is adjusted so that the concentration of the sterilizing component (to be described in detail later) generated by the electrolysis in the bath 7 becomes about 0.2 ppm. Is applied with a voltage. At this time, a voltage is applied between the electrode 18 and the electrode 19 so that the current density becomes 1 to 1.5 A.

When the purifying operation is started, dirty bath water in the bathtub 7 is sucked into the supply pipe 4 from a suction port formed in the suction unit 4a by the circulation pump 9. When the bath water passes through the suction unit 4a, large dirt such as the user's hair is removed by the filter. Further, a check valve provided further downstream prevents backflow of bath water into the bathtub 7.

Subsequently, the bath water flows into the electrolytic cell 8 provided in the supply pipe 4 via the inflow pipe 8a. Tap water contains chlorine ions, and chloride water contained in the body fluid (specifically, sweat) of the user is dissolved in the bath water. Therefore, a voltage is applied between the electrodes 18 and 19,
When a current flows between the electrode 18 and the electrode 19, the inflow pipe 8
The bath water flowing into the electrolysis chamber 21 or 22 via a is electrolyzed as shown below. By the way, the voltage applied between the electrode 18 and the electrode 19 is switched between positive and negative at predetermined time intervals. However, for convenience of explanation, hereinafter, the electrode 18 becomes a negative electrode and the electrode 19 becomes a positive electrode. The state of the electrolysis chambers 21 and 22 in the case where it is performed will be described.

Electrolysis chamber 21 in which electrode 18 (negative electrode side) is arranged
Then, as shown in the following chemical formula (5), chloride ions and hydroxide ions react to generate hypochlorite ions, which are sterilizing components. Cl ⁻ + 2OH ⁻ → OCl ⁻ + 2e ⁻ + H ₂ O (5) As shown in the chemical formula (4), the hydrogen ions attracted to the electrode 18 are decomposed into hydrogen gas and consumed.

On the other hand, in the electrolytic chamber 22 in which the electrode 19 (positive electrode side) is disposed, as shown by the chemical formulas (1) and (2), most of the hydroxide ions are converted to oxygen gas and most of the chlorine ions are converted to oxygen gas. Is decomposed into chlorine gas and removed. But,
Part of the chlorine gas generated by the decomposition of chlorine ions reacts with water as shown in chemical formula (3) to generate hypochlorous acid.

When the polarity of the electrodes 18 and 19 is reversed, the reactions represented by the chemical formulas (1) to (3) occur at the electrode 18, and the reactions represented by the chemical formulas (4) and (5) occur at the electrode 18. Since it occurs, the description is omitted. Thus, water containing hypochlorite ions generated in the electrolytic chamber 21;
Hypochlorous acid-containing water generated in the electrolysis chamber 22 merges at a portion downstream of the cation exchange membrane 20 where the electrolysis chamber 21 and the electrolysis chamber 22 communicate with each other, and electrolyzes through the outflow pipe 8b. It flows out of the tank 8 to the supply pipe 4.

The bath water flowing out of the electrolytic cell 8 flows into the purification column 3 from the supply pipe 4 via the inflow pipe 3a. The bath water that has flowed into the purification column 3 comes into contact with the filter medium 15 and the photocatalyst 17 housed in the filter medium casing. When the dirty bath water comes into contact with the filter medium 15, the organic substances among the components of the dirt contained in the bath water are adsorbed on the filter medium 15, and the organic substances are decomposed and purified by microorganisms attached to the filter medium 15.

Since the ultraviolet lamp 16 is on, the photocatalyst 17 is irradiated with ultraviolet light. By the photocatalyst 17 excited by ultraviolet rays, odor components contained in the bath water and substances having a small molecular diameter such as inorganic salts are adsorbed by the filter medium 15 and decomposed. The purified water that has passed through the purification column 3 flows out of the outflow pipe 3 b of the purification column 3 and is sent to the discharge pipe 5. Further, the purified water is sent to the discharge unit 5a arranged in the bathtub 7, and finally discharged from the discharge port into the bathtub 7.

The purified water discharged into the bath 7 has an electrolytic cell 8
And the concentration of the sterilizing component in the bath 7 is about 0.2 ppm. Therefore, the concentration is higher than the concentration (0.1 ppm) of the germicidal components (hypochlorite ion and hypochlorous acid) required to sufficiently suppress the propagation of various bacteria contained in the bath water. In addition, propagation of various bacteria contained in the bath water in the bath tub 7 can be sufficiently suppressed, and the bath water in the bath tub 7 can be kept hygienic.

In this embodiment, the electrolytic cell 8 is provided on the upstream side of the purification column, and the bath water containing the sterilizing component is
The microorganisms for purifying the bath water come into contact with the filter medium 15 to which the microorganisms adhere, but the microorganisms form colonies on the surface of the filter medium 15 and are hard to be sterilized compared to various bacteria floating in the bath water. It has become. for that reason,
The microorganisms adhering to the filter medium 15 are sterilized by the sterilizing component generated in the electrolytic cell 8, and the purification ability of the bath water is not lost.

As described above, since the electrolytic cell 8 is partitioned by the cation exchange membrane 20, the electrolytic cell 2
The hydroxide ions and chlorine ions present in 1 cannot move to the electrolytic chamber 22. That is, hydroxide ions and chlorine ions are not decomposed into chlorine gas and oxygen gas, and hypochlorite ions are generated as shown by the chemical formula (4). That is, the hypochlorite ion and the hypochlorite having a concentration sufficient to sterilize various bacteria contained in the bath water in the bathtub 7 without consuming the chlorine ion which is a chlorine supply source of the hypochlorite ion. The acid can be generated efficiently.

In particular, since chloride ions are replenished by the body fluid of the user, when the present invention is applied to a bath water purification apparatus for purifying bath water, an electrolyte (eg, salt) serving as a chlorine supply source is used. Can be added to produce hypochlorite ion at a concentration sufficient to sterilize various bacteria. Further, in the present embodiment, not only hypochlorite ion as a sterilizing component is generated in the electrolytic chamber 21 in which the electrode 18 on the negative electrode side is disposed, but also the electrode 19 on the positive electrode side is formed. Hypochlorous acid, which is a sterilizing component, is also generated in the disposed electrolytic chamber 22, so that even if the water passing through the electrolytic chambers 21 and 22 is merged downstream of the cation exchange membrane 20, the bathtub The concentration of the sterilizing component in 7 can be such that it is sufficient to sterilize the bath water. Therefore, the outflow pipe 8 b that allows the water containing the sterilizing components (hypochlorite ions and hypochlorous acid) generated in the electrolysis chambers 21 and 22 to flow out of the electrolysis tank 8.
And a simple piping structure.

The germicidal components generated in the electrolytic cell 8 are decomposed by the ultraviolet rays emitted from the ultraviolet lamp 16. Therefore, it is possible to prevent the concentration of the bactericidal component in the bath water from being excessively increased, and a moderate range (0.15 to 0.15) in which the growth of various bacteria in the bath water is suppressed.
0.25 ppm). [Second Embodiment] Next, a second embodiment will be described with reference to FIG. Note that the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description is omitted.

A purifying unit 30 as a purifying unit is composed of a filter casing (not shown) in which a filter medium 15 is filled in a substantially cylindrical container made of metal, and an ultraviolet lamp 16 and an ultraviolet lamp 16 above the filter medium casing. And a photocatalyst 17 disposed around the photocatalyst. The discharge pipe 5 branches into a main pipe 5a and a branch pipe 5b, and an electrolytic tank 8 is provided in the branch pipe 5b. A three-way valve 31 is provided at a downstream end of an outflow pipe (not shown) of the electrolytic cell 8, and a drain pipe 32 for discharging bath water out of the bathtub 7 is connected via the three-way valve 31. ing. When the three-way valve 31 is opened, the bath water flowing out of the electrolytic bath 8 is discharged to the outside of the bath tub 7 through the drain pipe 32. When the three-way valve 31 is closed, the bath water is discharged through the branch pipe 5b. Return into the bathtub.

In this embodiment, as in the first embodiment, a sterilizing component is generated by applying a voltage between the electrodes 18 and 19. By the way, when the bath water contains a lot of minerals such as calcium, the electrodes 18, 1
When a voltage is applied between the electrodes 9, minerals adhere to the surfaces of the electrodes 18 and 19, and the electrolysis efficiency is reduced. In addition, a salt such as calcium carbonate is generated by the irradiation of the ultraviolet rays, and is deposited on the photocatalyst 17, so that the purification ability of the photocatalyst 17 may be reduced.

Therefore, in the present embodiment, the polarity of the voltage applied to each of the electrodes 17 and 18 is inverted by the polarity switching device 33 every predetermined time T ₁ (for example, one hour), so that the amount of the attached minerals is reduced. Is removed from the surfaces of the electrodes 17 and 18, and after reversing the polarity of the voltage applied to each of the electrodes 17 and 18, the three-way valve 31 is switched over for a predetermined time T ₂ (for example, 10
Min), and the mineral removed from the surfaces of the electrodes 17 and 18 is discharged out of the bathtub. As a result, the concentration of minerals in the bath water can be reduced, and the reduction in the efficiency of electrolysis and the reduction in the purification ability of the photocatalyst as described above can be prevented.

As shown in the first embodiment, the supply pipe 4 is not provided with the electrolytic cell 8 directly.
As shown in FIG. 3, a configuration may be adopted in which an electrolytic cell 8 is provided in a bypass 4 c that partially bypasses the supply pipe 4. By providing the electrolytic cell 8 in the bypass 4c in this way,
Since the flow rate of the bath water flowing into the electrolytic cell 8 decreases and the flow rate of the bath water passing through the electrolytic tank 8 decreases,
The chloride ion concentration in the vicinity of 8 and 19 increases. As a result, the concentrations of hypochlorite ions and hypochlorous acid generated by electrolysis can be increased.

Further, in this embodiment, the embodiment applied to the sterilizer of the water purifier for purifying the bath water has been described. However, the present invention can be applied to a sterilizer such as a water purifier. Further, in the second embodiment, the cation exchange membrane is used as the diaphragm as in the first embodiment. However, the polarity switching device 33 removes minerals by reversing the voltage. In the case of the water purification device 1,
A neutral membrane may be used as the diaphragm.

The specific numerical values, microorganism species, and the like shown in the present embodiment are merely examples, and the present invention is not limited to these.

[Brief description of the drawings]

FIG. 1 is a system diagram showing an outline of a first embodiment of the present invention.

FIG. 2 is a diagram schematically illustrating an electrolytic cell according to the first embodiment of the present invention, and is a schematic diagram illustrating the behavior of each ion during electrolysis.

FIG. 3 is a diagram showing another embodiment of the present invention.

FIG. 4 is a view schematically showing a conventional electrolytic cell, and is a schematic view showing the behavior of each ion during electrolysis.

FIG. 5 is a system diagram schematically showing a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bath water purification apparatus 3 Purification cylinder which is a purifying part 4 Supply pipe which is bath water supply means 5 Discharge pipe which is discharge means 7 Bath tub 8 Electrolysis tank which is a sterilization apparatus 15 Filter material 18 Electrode 19 Electrode 20 Cation exchange membrane 21 Electrolysis Room 22 Electrolysis room

────────────────────────────────────────────────── ─── front page continued (51) Int.Cl. ⁶ identifications FI C02F 1/32 C02F 1/50 510A 1/50 510 520L 520 531P 531 540B 540 550D 550 560F 560 1/76 a 1/76 3 / 06 ZAB 3/06 ZAB B01D 35/02 J

Claims (5)

[Claims] 1. An inflow pipe (8a) through which tap water flows, a pair of electrodes (18, 19) arranged across a cation exchange membrane (20), and these electrodes (18, 19) An electrolytic chamber (21, 22) through which the tap water flowing through the inflow pipe (8a) passes; and an outflow pipe (8b) through which the tap water flows out of the electrolytic chambers (21, 22). In a sterilizer for sterilizing tap water by applying a voltage to the pair of electrodes (18, 19) and electrolyzing tap water flowing from the inflow pipe (8a), the cation exchange membrane (20) On the further downstream side, the respective electrolysis chambers (18, 19) are communicated with each other, and after the water passing through these electrolysis chambers (18, 19) is merged, tap water is flown out from the outflow pipe (8b). A disinfection device characterized by that: 2. A purifying section (3) filled with a filter medium (15) to which microorganisms are adhered and purifying bath water in the bathtub (7) by the microorganisms. A bath water supply means (4) for supplying bath water, and a discharge means (5) for discharging the water purified by the purification section (3) to the bath tub (7) and re-supplying the water.
Flowing the bath water in the bathtub (7) through the inflow pipe (8a) into each of the electrolysis chambers (21, 22) in which the pair of electrodes (18, 19) are arranged; Electrolysis chamber (21, 2
The bath water purification device, comprising: the sterilizing device according to claim 1, wherein the bath water flowing into 2) is discharged to the bathtub. 3. An ultraviolet lamp (16) provided in the purifying section (3) for irradiating ultraviolet rays, and a photocatalyst (17) excited by ultraviolet rays radiated by the ultraviolet lamp (16). The bath water purifier according to claim 2, characterized in that: 4. A purifying section (3) filled with a filter medium (15) to which microorganisms have adhered and purifying bath water in the bathtub (7) by the microorganisms, and an ultraviolet ray provided in the purifying section and irradiating ultraviolet rays. A lamp (16); a photocatalyst (17) which is excited by ultraviolet rays irradiated by the ultraviolet lamp (16); and a bath water supply means () for supplying bath water of the bathtub (7) to the purifying section (3). 4), a discharge means (5) for discharging the water purified by the purification section (3) to the bathtub (7) and re-supplying the water, and an inflow pipe for flowing bathwater in the bathtub (7). 8a)
And a pair of electrodes (18,
19), these electrodes (18, 19) are disposed respectively, and the electrolysis chambers (21, 22) through which the bath water flowing in by the inflow pipe (8a) passes, and the electrolysis chambers (21, 2).
An outlet pipe (8b) for allowing the bath water to flow out from 2), a voltage is applied to the pair of electrodes (18, 19), and the bath water flowing from the inlet pipe (8a) is electrolyzed. A bath water purifier comprising: a sterilizer (1) for sterilizing water. 5. A sterilizing device connected to the outflow pipe (8b) via a three-way valve (31) and a polarity switching device (33) for reversing the polarity of the voltage applied to the electrodes (18, 19). A drain pipe (32) for discharging the bath water passing through (1) to the outside of the bathtub (7); and the polarity switching device (33) for the electrodes (18, 1).
After inverting the polarity of the voltage applied to 9), the three-way valve (31) is switched, and the bath water that has passed through the sterilizing device (1) for a predetermined time passes through the drain pipe (32), and the bathtub (7) The bath water purifier according to any one of claims 2 to 4, wherein the water is discharged to the outside.