JP2012041572A - Ozone water generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ozone water generator capable of preventing contamination of ozone water and obtaining the ozone water of high purity.SOLUTION: The ozone water generator 100 includes a catalyst electrode 2 composed by holding a cation exchange membrane 21 between an anode electrode 22 and a cathode electrode 23 and generates the ozone water by supplying raw material water to the cation electrode 22, supplying cathode water to the cathode electrode 23 and applying a DC voltage between the anode electrode 22 and the cathode electrode 23. An outflow path 12a for making the raw material water or the generated ozone water flow out to the outside is provided on the side of the anode electrode 22, the outflow path 12a is provided with a three-way solenoid valve 3, one of the exits of the three-way solenoid valve 3 is connected to a water discharge line 31 which discharges the ozone water, the other exit of the three-way solenoid valve is connected to a drain line 32, and the raw material water supplied to the catalyst electrode 2 is drained from the drain line 32 for a fixed time together with operation start.

Description

  The present invention relates to an ozone water generator.

In recent years, ozone water has been widely used for applications such as sterilization of foods and deodorization of malodorous gases, and many examples of knowledge have begun to be published in the fields of medical care and nursing care. Also in the semiconductor manufacturing area, the feature of ozone oxidation with respect to the ultrafine structure is recognized, and the use of ozone water is essential.
As such a method for producing ozone water, the anode electrode is pressed against one surface of the cation exchange membrane, and the raw material water is brought into direct contact with the electrolytic surface of the catalyst electrode formed by pressing the cathode electrode against the other surface. The thing using the direct electrolysis method which produces | generates ozone water by electrolysis of is known (for example, refer patent document 1).
The ozone water generation apparatus using the direct electrolysis method has a feature that it can be repeatedly used while making raw water into ozone water little by little because it has very good response to rise and fall.

JP-A-8-134678

However, in the case where the raw water is dechlorinated water or purified water that does not contain free chlorine, the possibility that the water staying in the apparatus is contaminated while it is not being used cannot be denied. In such a case, it is recommended that this be drained at the initial stage of operation of the apparatus, and further washed and drained with newly supplied water.
In addition, when ozone water is generated from purified water, since the conductivity of purified water is low, the electrolysis reaction that generates ozone is not sufficiently accelerated. It helps to move from the side to the cathode electrode side.
However, in the system using the electrolyte solution on the cathode electrode side in this way, there is a problem that the components in the electrolyte solution infiltrate the solid electrolyte membrane during the stop and precipitate on the anode electrode side to contaminate the anode electrode side. is there. If ozone water is generated in this state, the electrolyte component infiltrated into the solid electrolyte membrane while the apparatus is stopped is discharged together with the ozone water at the initial stage of operation of the apparatus and contaminates the ozone water.
This invention is made | formed in view of the said situation, and it aims at providing the ozone water production | generation apparatus which can prevent ozone water contamination and can obtain ozone water with high purity.

In order to solve the above problems, the invention of claim 1 includes a catalyst electrode in which a cation exchange membrane is sandwiched between an anode electrode and a cathode electrode,
In the ozone water generator for supplying ozone water by supplying raw water to the anode electrode, supplying cathode water to the cathode electrode and applying a direct current voltage between the anode electrode and the cathode electrode,
The anode electrode side is provided with an anode side outflow portion for flowing out raw material water or generated ozone water to the outside,
A three-way solenoid valve is provided in the anode-side outflow portion;
One of the outlets of the three-way solenoid valve is connected to a water discharge line that discharges ozone water,
The other outlet of the three-way solenoid valve is connected to a drain line,
The raw water supplied to the catalyst electrode at the start of operation is drained from the drain line for a certain time.

According to the invention of claim 1, on the anode electrode side, an anode-side outflow portion that flows out raw material water or generated ozone water to the outside is provided, and a three-way solenoid valve is provided in the anode-side outflow portion, One of the outlets of the three-way solenoid valve is connected to a water discharge line that discharges ozone water, the other of the outlets of the three-way solenoid valve is connected to a drainage line, and the raw water supplied to the catalyst electrode at the start of operation for a certain period of time, Since the water is drained from the drainage line, even if the raw water staying in the equipment is contaminated while it is not in use, the contaminated raw water is drained from the drainage line at the beginning of operation and newly supplied. Washed and drained with raw water. As a result, it is possible to obtain ozone water having a high ozone concentration from the water discharge line without mixing the contaminated raw material water after a certain period of time. This is particularly effective when dechlorinated water or purified water that does not contain free chlorine is used as the raw water.
In addition, when purified water is used as raw water, purified water has low electrical conductivity, so the electrolysis reaction that generates ozone is not sufficiently accelerated. The movement from the anode electrode side to the cathode electrode side is promoted. As described above, in the method using the electrolyte solution on the cathode electrode side, the components in the electrolyte solution may infiltrate the cation exchange membrane and precipitate on the anode electrode side to contaminate the anode electrode side while the apparatus is stopped. If the ozone water is generated as it is, the electrolyte component infiltrated into the cation exchange membrane during the operation stop in the initial stage of operation is discharged together with the ozone water to contaminate the ozone water. However, such contamination of ozone water can be reliably prevented by draining the raw material water for a certain period of time at the start of operation as in the present invention.

The invention of claim 2 is the ozone water generator according to claim 1,
With the three-way solenoid valve energized, the water discharge line is closed, the drainage line is opened,
With the energization of the three-way solenoid valve turned off, the water discharge line is opened, the drainage line is closed,
When the operation is started, the raw water passed through the catalyst electrode is turned on for a certain period of time, the energization of the three-way solenoid valve is turned on, drained to the drainage line, and after the elapse of the certain period of time, the energization of the three-way solenoid valve is turned off. And discharging water from the water discharge line.

  According to the invention of claim 2, the water discharge line is closed for a certain period of time while the energization of the three-way solenoid valve is ON, the drainage line is opened, and the water discharge line is opened while the energization of the three-way solenoid valve is OFF. The drainage line is closed, and the raw water that has passed through the catalyst electrode at the start of operation is turned on for a certain period of time, the energization of the three-way solenoid valve is turned on and drained to the drainage line. The energization is turned off and water is discharged from the water discharge line. Since the energization is turned off by the operation stop, the drainage line is continuously closed from the operation state, the water discharge line remains open, and the ozone water in the system is discharged naturally and finally stops. Moreover, since ozone has a strong bactericidal property, the water discharge line after discharging the ozone water is always kept clean.

Invention of Claim 3 is the ozone water generating apparatus of Claim 1 or 2,
When the raw water supplied to the catalyst electrode is drained from the drain line for a certain period of time with the start of operation, low-concentration ozone water generated immediately after the start of operation is also drained from the drain line.

According to the invention of claim 3, since the low-concentration ozone water generated at the time of startup immediately after the start of operation is drained, the discharged ozone water can always maintain a certain concentration or more.
In addition, when an electrolytic solution is used as cathode water on the cathode electrode side, the components of the electrolyte solution that infiltrate the cation exchange membrane and deposit on the anode electrode side while the apparatus is stopped are discharged together with ozone water to Although water is contaminated, even in such a case, drain the ozone water at a low concentration that may contain pollutants immediately after the start of operation, so that the discharged ozone water is always highly pure ozone water. Can do.

  According to the present invention, contamination of ozone water can be prevented and high-purity ozone water can be obtained.

It is the longitudinal cross-sectional view which showed the outline of the ozone water production | generation apparatus typically, and has shown at the time of the normal driving | operation of the ozone water production | generation apparatus, and a stop. It is the longitudinal cross-sectional view which showed the outline of the ozone water production | generation apparatus typically, and has shown the time of initial operation of an ozone water production | generation apparatus. It is the graph which showed the rise (time change) of ozone water concentration. It shows a modification, and is a case where a mixing device is used in the ozone water generator of FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[First Embodiment]
FIG. 1 is a longitudinal sectional view schematically showing an outline of the ozone water generator 100.
The ozone water generating apparatus 100 is configured by arranging a catalyst electrode 2 in a casing 1 into which raw water and cathode water are introduced. And it is an apparatus which produces | generates ozone water by generating an ozone bubble in the anode electrode 22 side by applying a DC voltage to the catalyst electrode 2, and dissolving the ozone bubble in water.
As raw water, dechlorinated water, purified water, tap water, etc. that do not contain free chlorine can be used.
As the cathode water, for example, an electrolytic solution such as saline, potassium chloride solution, calcium chloride solution can be used.
The casing 1 has a rectangular parallelepiped shape that is long in the vertical direction and closed at both the upper and lower ends. Inflow passages 11 a and 1 for allowing raw water and cathode water to flow into the casing 1 on the lower surface of the casing 1.
1b is provided, and on the upper surface of the casing 1, outflow paths 12a and 12b are provided for flowing out the generated ozone water on the anode electrode 22 side and cathode water on the cathode electrode 23 side.

The inflow channel 11a on the anode electrode 22 side is connected to, for example, a small pump having a constant discharge pressure connected to a tank in which raw material water is stored, or a water tap. Further, the outflow path 12a on the anode electrode 22 side.
Is connected to the three-way solenoid valve 3.
The three-way electromagnetic valve 3 is connected to the outflow passage 12a on the anode electrode 22 side, and one of the two outlets of the three-way electromagnetic valve 3 is connected to a water discharge line 31 (see FIG. 1 (a)) that discharges ozone water. The other is connected to the drainage line 32 (see FIG. 1 (b)). The water discharge line 31 is connected to a tank (not shown) for storing ozone water generated in the casing 1, a nozzle (not shown) for ejecting ozone water, and the like.
The three-way solenoid valve 3 has a type in which one outlet opens a passage through electricity (referred to as “nomal close (NC) because it is closed when there is no electricity), and a type in which the other outlet closes a passage through electricity (electricity). If it is not, it is open and is called nomal open (NO)). That is, in the three-way solenoid valve 3, the water discharge line 31 is closed (NO) and the drainage line 32 is opened (NC) when energization is ON (when excited). On the other hand, when power is off (when degaussing)
Thus, the water discharge line 31 is opened (NO), and the drainage line 32 is closed (NC).
When the operation of the ozone generator 100 is started and the energization of the three-way solenoid valve 3 is turned on, as shown in FIG. 1 (b), the water discharge line 31 is closed and the drainage line 32 is opened for a certain period of time. The raw water passed through the electrode 2 or the initial low-concentration ozone water is drained from the drain line. After draining for a certain time, the energization of the three-way solenoid valve 3 is turned off. As a result, as shown in FIG. 1A, the drainage line 32 is closed and the water discharge line 31 is opened, and ozone water that has reached a predetermined concentration is discharged from the water discharge line 31.

Here, although the said fixed time changes with the density | concentrations of the ozone water to produce | generate, when operating 200 mL of ozone water with a density | concentration of 5 ppm, for example, the operating time of an ozone water production | generation apparatus is 15 second, and the first 1 This is because the low-concentration ozone water that does not reach 5 ppm for 3 seconds, more preferably 3 seconds, is discarded.
FIG. 2 is a graph showing the rise (temporal change) of the ozone water concentration immediately after the ozone water generator 100 is activated. As is apparent from this graph, it is recognized that the ozone water has a low concentration for 1 to 5 seconds immediately after starting.
The low-concentration ozone water refers to ozone water having a concentration of about half or less of the concentration of ozone water desired to be generated. Therefore, when the concentration of ozone water to be generated exceeds a half of the concentration (predetermined concentration), control is performed so that the energization of the three-way solenoid valve 3 is switched from ON to OFF.

The outflow path 12b on the cathode electrode 23 side is connected to a circulation path 25 that once drains the cathode water generated on the cathode electrode 23 side, and then flows it again to the cathode electrode 23 side through the inflow path 12a and circulates it. ing.
Further, an insertion hole 13 into which an upper end portion of a cation exchange membrane 21 described later is inserted is formed on the inner wall surface of the casing 1 between the two inflow passages 11a and 11b, and between the two outflow passages 12a and 12b. An insertion hole 14 into which the lower end portion of the cation exchange membrane 21 is inserted is also formed in the inner wall surface of the casing 1.
In the casing 1, raw material water flows from the inflow channels 11a and 11b, and water flows from the inflow channels 11a and 11b to the outflow channels 12a and 12b.

  The circulation path 25 is a path connecting the outflow path 12b on the cathode electrode 23 side and the inflow path 11b on the cathode electrode 23 side. In the middle of the circulation path 25, a pump 26 for circulating water and a tank 27 for temporarily storing water are provided.

  The tank 27 is provided with a cooler 271 for cooling the cathode water discharged from the cathode electrode 23 side to about 20 to 25 ° C., for example. As the tank 27 and the cooler 271, a known small chiller or the like can be used.

  In this way, the outflow path 12b on the cathode electrode 23 side, the tank 27, the pump 26, and the inflow path 11b on the cathode electrode 23 side are sequentially connected by the circulation path 25 so that the cathode water circulates in the circulation path 25. It has become.

The catalyst electrode 2 is disposed at a substantially central portion in the casing 1, and has a cation exchange membrane 21, an anode electrode 22 pressed against one of both surfaces of the cation exchange membrane 21, and a pressure contact with the other surface. The cathode electrode 23 is provided. The cation exchange membrane 21 has an upper end portion fitted into the insertion hole 13 and a lower end portion fitted into the insertion hole 14 to be fixed. Further, a concave portion is formed on the inner wall surface of the casing 1 facing the anode electrode 22 side, and a holding plate 15 for holding the anode electrode 22 is attached in the concave portion, and the anode electrode 22 is attached to the holding plate 15. Is retained. Similarly, a recess is formed in the inner wall surface of the casing 1 facing the cathode electrode 23 side, and a holding plate 16 for holding the cathode electrode 23 is attached in the recess, and the cathode electrode 23 is attached to the holding plate 16. Is retained. Thus, by arranging the cation exchange membrane 21, the anode electrode 22, and the cathode electrode 23 in the casing 1, the anode electrode 22 side and the cathode electrode 23 side are separated by the cation exchange membrane 21, and the cation exchange is performed. The outer periphery of the membrane 21 can be fixed to the casing 1 and is sealed so that raw water, ozone water, cathode water and the like do not leak outside. Further, the anode plate 22 and the cathode electrode 23 are appropriately pressed against the cation exchange membrane 21 side by the holding plates 15 and 16. And the raw material water which flowed in from the inflow paths 11a and 11b contacts the anode electrode 22 and the cathode electrode 23 continuously, respectively.
An output terminal 24 of a power supply device (not shown) is electrically connected between the anode electrode 22 and the cathode electrode 23 so that a DC voltage is applied. That is, the anode electrode 22 and the cathode electrode 23 are connected to the power supply device via the conductive wires to the electrodes 22 and 23. The applied DC voltage is preferably 6 to 24 volts, for example.
With the ON / OFF operation of the power supply device, the energization of the three-way solenoid valve 3 is also turned ON / OFF. Specifically, when the power supply device is turned on, the energization of the three-way solenoid valve 3 is turned on during the initial operation of the ozone water generating device 100 (see FIG. 1 (b)). The energization of the solenoid valve 3 is turned off (see FIG. 1A), and the energization of the three-way solenoid valve 3 is continuously turned off when the ozone water generating device 100 is stopped (see FIG. 1A).

  As the cation exchange membrane 21, a conventionally known one can be used, and a fluorine-based cation exchange membrane having high durability against the generated ozone can be used. For example, a thickness of 100 to 300 μm is preferable.

  The anode electrode 22 is not in close contact with the cation exchange membrane 21 so as to completely cover it, but has a large number of through holes, and the cation exchange membrane 21 has a contact portion and a non-contact portion. It is piled up. That is, it is preferable that the anode electrode 22 has a grating shape or a punching metal shape. FIG. 1 shows a case where the anode electrode 22 has a grating shape. Specifically, the grating shape is a lattice shape in which wires are integrated, and the punching metal shape is a porous plate shape in which a large number of through holes are formed in a metal plate.

  As the anode electrode 22, a material having an ozone generation catalyst function is used. Specific examples include β-lead dioxide, platinum, platinum group (palladium, rhodium, ruthenium), gold, carbon (graphite), diamond, etc. Among these noble metals, platinum, gold are preferable because of their good stability. Alternatively, it is preferable to use a coating metal thereof, and in particular, when a metal obtained by coating platinum on titanium is used, the product cost can be reduced. The coating process can be performed by, for example, plating or heat deposition.

  By forming the grating-like anode electrode 22 in this way, the intersections of the members constituting the anode electrode 22 are pointed and protrude to the outer surface, and contact with the water flow to generate a vortex flow. Fine ozone bubbles generated at the anode electrode 22 Can be dissolved to accelerate dissolution.

As the cathode electrode 23, a material having an ozone generation catalyst function is used. Specifically, it is possible to use the same noble metal as the anode electrode 22 described above, and it is preferable to use platinum, gold, or a coating metal thereof from the viewpoint of good stability. In particular, a metal in which titanium is coated with platinum is used. If used, the product cost can be kept low. The cathode electrode 23 is disposed so as to be in contact with the cation exchange membrane 21.
The cathode electrode 23 is also preferably formed in a grating shape like the anode electrode 22. In particular, the cathode electrode portion 23 is preferably formed so as to have a coarser mesh than the anode electrode 22.
The cation exchange membrane 21, the anode electrode 22, and the cathode electrode 23 described above are formed into a flat plate shape as the catalyst electrode 2. The catalyst electrode 2 is held in pressure contact with holding plates 15 and 16 in the casing 1.

Next, the operation of the ozone water generating apparatus 100 having the above configuration will be described.
First, when the power supply device is turned on and the ozone water generating device 100 starts operation, the water discharge line 31 of the three-way electromagnetic valve 3 is closed and the drainage line 32 is opened as shown in FIG.
Thereafter, raw water (such as tap water or purified water) is caused to flow into the casing 1 from the inflow passage 11a on the anode electrode 22 side, and an electrolyte such as saline is introduced into the casing 1 from the inflow passage 11b on the cathode electrode 23 side. Let it flow. Then, the raw material water and the cathode water are continuously brought into contact with each surface of the anode electrode 22 and the cathode electrode 23. At the same time, a predetermined voltage is applied between the anode electrode 22 and the cathode electrode 23 by driving the power supply device. By this energization, the raw water is electrolyzed, and hydrogen in the raw water passes through the cation exchange membrane 21 from the anode electrode 22 side and accelerates and moves to the cathode electrode 23 side. As a result, ozone bubbles are generated on the anode electrode 22 side, and hydrogen bubbles are generated on the cathode electrode 23 side.

Here, on the anode electrode 22 side, the direction of the flow of raw material water is complicated due to slight unevenness of the anode electrode 22 and becomes a vortex. Therefore, on the anode electrode 22 side, the generated ozone bubbles are quickly taken into water and dissolved to generate ozone water, and between the anode electrode 22 and the cation exchange membrane 21 (more precisely, the anode electrode 22 and the cathode electrode). 23), a state where a large amount of current flows is ensured.
Ozone water is generated in this way, but since the ozone concentration of ozone water is low for a certain period from the start of operation, it is drained from the drain line 32 via the outflow path 12a and the three-way solenoid valve 3. . Then, after a predetermined time has elapsed (when a predetermined concentration is reached), as shown in FIG. 1A, the drainage line 32 is closed and the water discharge line 31 is opened, so that ozone water is stored in the ozone water from the water discharge line 31. Stored in a tank or the like.
Thereafter, while the energization of the three-way solenoid valve 3 is OFF, the ozone water in the system is naturally discharged from the water discharge line 31 and finally stops.

On the other hand, on the cathode electrode 23 side, hydrogen bubbles are generated and discharged together with the cathode water from the outflow path 12b. The discharged cathode water flows through the circulation path 25 and is temporarily stored in the tank 27. At this time, after being cooled by the cooler 271, the pump 26 is again supplied from the inflow passage 11 b on the cathode electrode 23 side to the cathode electrode 23 side in the casing 1, and the cathode water circulates sequentially.

As mentioned above, according to embodiment of this invention, the outflow path 12a which flows out raw material water or produced | generated ozone water outside is provided in the anode electrode 22 side, and the three-way solenoid valve 3 is provided in the outflow path 12a. One of the outlets of the three-way solenoid valve 3 is connected to a water discharge line 31 that discharges ozone water, and the other outlet of the three-way solenoid valve 3 is connected to a drainage line 32, and is supplied to the catalyst electrode 2 when the operation is started. Since the raw water is drained from the drain line 32 for a certain period of time, even if the raw water staying in the apparatus 100 is contaminated while it is not in use, the contaminated raw water is discharged at the initial stage of operation. In addition to being drained from the water, it is washed and drained with the newly supplied raw material water. As a result, after a certain period of time, the contaminated raw material water is not mixed, and ozone water having a high ozone concentration can be obtained from the water discharge line 31. This is particularly effective when dechlorinated water or purified water that does not contain free chlorine is used as the raw water.
In addition, when purified water is used as the raw water, since the electrolysis reaction that generates ozone is not sufficiently promoted because the purified water has low conductivity, an electrolyte is used as the cathode water on the cathode electrode 23 side and hydrogen ions are used. Is moving from the anode electrode 22 side to the cathode electrode 23 side. As described above, in the method of using the electrolytic solution on the cathode electrode 23 side, the components in the electrolytic solution infiltrate into the cation exchange membrane 21 while the apparatus 100 is stopped, and are deposited on the anode electrode 22 side. If ozone water is generated in this state, the electrolyte component infiltrated into the cation exchange membrane 21 during the stop of the apparatus 100 at the initial stage of operation is discharged together with the ozone water to contaminate the ozone water. Will do. However, such contamination of ozone water can be reliably prevented by draining the raw material water for a certain period of time at the start of operation as in the present invention.

Further, the water discharge line 31 is closed for a certain period of time while the energization of the three-way electromagnetic valve 3 is ON, the drainage line 32 is opened, and the water discharge line 31 is opened while the power supply of the three-way electromagnetic valve 3 is OFF, The drainage line 32 is closed, and the raw water passed through the catalyst electrode 2 at the start of operation is turned on for three hours, the energization of the three-way solenoid valve 3 is turned on, drained to the drainage line 32, and after a certain period of time, the three-way electromagnetic The energization of the valve 3 is turned off, water is discharged from the water discharge line 31, and the operation of the three-way solenoid valve 3 is turned off when the operation is stopped. Subsequently, the drainage line 32 is closed, the water discharge line 31 remains open, and the ozone water in the system is naturally discharged and finally stops. Moreover, since ozone has a strong bactericidal property, the water discharge line after discharging the ozone water is always kept clean.
Furthermore, since the low-concentration ozone water generated at the time of start-up immediately after the start of operation is drained, the ozone water discharged can always maintain a certain concentration or more.
Further, when an electrolytic solution is used as the cathode water on the cathode electrode 23 side, the components of the electrolyte solution that infiltrate the cation exchange membrane 21 and are deposited on the anode electrode 22 side while the apparatus 100 is stopped are combined with ozone water. Water is discharged and pollutes the ozone water. Even in such a case, the ozone water discharged always has high purity by draining low-concentration ozone water that may contain pollutants immediately after the start of operation. Can be water.

  Further, since the pump 26 and the tank 27 are provided in the circulation path 25, the cathode water can be efficiently circulated in the circulation path 25.

  In the above embodiment, for example, as shown in FIG. 3, the holding plates 15 and 16 may be formed with a plurality of irregularities 151 and 161 so that the surfaces on the side of the electrodes 22 and 23 have a mountain shape. By using such a mixing device, the supplied water is stirred, and dissolution of ozone fine bubbles in water is promoted.

2 Catalytic electrode 3 3-way solenoid valve 12a Outflow path (anode-side outflow part)
21 Cation exchange membrane 22 Anode electrode 23 Cathode electrode 31 Water discharge line 32 Drain line 100 Ozone water generator

Claims (3)

A catalyst electrode in which a cation exchange membrane is sandwiched between an anode electrode and a cathode electrode,
In the ozone water generator for supplying ozone water by supplying raw water to the anode electrode, supplying cathode water to the cathode electrode and applying a direct current voltage between the anode electrode and the cathode electrode,
The anode electrode side is provided with an anode side outflow portion for flowing out raw material water or generated ozone water to the outside,
A three-way solenoid valve is provided in the anode-side outflow portion;
One of the outlets of the three-way solenoid valve is connected to a water discharge line that discharges ozone water,
The other outlet of the three-way solenoid valve is connected to a drain line,
An ozone water generating device characterized in that the raw water supplied to the catalyst electrode is drained from the drain line for a certain period of time when the operation is started. With the three-way solenoid valve energized, the water discharge line is closed, the drainage line is opened,
With the energization of the three-way solenoid valve turned off, the water discharge line is opened, the drainage line is closed,
When the operation is started, the raw water passed through the catalyst electrode is turned on for a certain period of time, the energization of the three-way solenoid valve is turned on, drained to the drainage line, and after the elapse of the certain period of time, the energization of the three-way solenoid valve is turned off. The ozone water generating apparatus according to claim 1, wherein water is discharged from the water discharge line. The low-concentration ozone water generated immediately after the start of operation is also discharged from the drain line when the raw water supplied to the catalyst electrode along with the start of operation is drained from the drain line for a certain period of time. Item 3. The ozone water generator according to Item 1 or 2.

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