WO2021220383A1 - Ozone-dissolved water production method - Google Patents

Abstract

[Problem] To provide an ozone-dissolved water production method, whereby ozone can be dissolved in water within a short time with high efficiency. [Solution] Three [L] of tap water is introduced into a storage tank 10, and then 12 [V] of a direct-current voltage is applied to an electrode unit 21 (between an anode plate 22 and a cathode plate 23) immersed in the tap water stored in the storage tank 10 for 20 minutes to generate an ozone-containing gas in the water in the storage tank 10 and, simultaneously, oscillations each having a frequency of 2 [MHz] and an amplitude of 2.08×10-6 [m] are applied continuously to the tap water in the storage tank 10 by means of an oscillator 31 for 20 minutes, whereby ozone-dissolved water is produced. In this regard, the intensity of the oscillations applied to the tap water by means of the oscillator 31 is 5.48×1014 [W/m2].

Description

Ozone dissolved water generation method

The present invention relates to an ozone-dissolved water generation method for generating ozone-dissolved water in which ozone is dissolved in water.

Ozone-dissolved water has a strong oxidizing power like ozone gas, has no persistence, and has almost no environmental load, so it is used for various purposes such as disinfection, sterilization, deodorization, decolorization, and cleaning. , The ozone-containing gas generated by the ozonizer is dissolved in water by bubbling or the like, or the ozone generated by electrolyzing water is dissolved in water.

Japanese Unexamined Patent Publication No. 2018-161619

However, since the half-life is very short when dissolved in water, ozone-dissolved water cannot be prepared and must be used while generating ozone-dissolved water at the site. In addition, since ozone is basically low in solubility in water, it may take some time to generate ozone-dissolved water with the required dissolved ozone concentration, and ozone that could not be dissolved in water is ozone gas. Since it will be released into the atmosphere as a waste ozone gas, it may be necessary to treat the released waste ozone gas. Therefore, it is desired to improve the solubility of ozone in water so that ozone can be efficiently dissolved in water in a short time.

Therefore, an object of the present invention is to provide a method for producing ozone-dissolved water, which can efficiently dissolve ozone in water in a short time.

In order to solve the above problem, the invention according to claim 1 is a method for generating ozone-dissolved water in which ozone is dissolved in water, and fine bubbles of ozone-containing gas having a diameter of nano-order are generated. A method for generating ozone-dissolved water, which comprises supplying an ozone-containing gas into the water while applying a vibration of ^{0.5 × 10 4} [W / m ² ] or more to the water in a state of being present in water. It is to provide.

Further, in the invention according to claim 2, in the method for generating ozone-dissolved water according to claim 1, the ozone-containing gas is supplied into water, and fine bubbles of the ozone-containing gas having a diameter of nano-order are introduced into water. It is characterized by generating.

Further, in the invention according to claim 3, in the method for producing ozone-dissolved water of the invention according to claim 1 or 2, the number concentration of fine bubbles of the ozone-containing gas having a diameter of nano-order existing in water is 1.0. it is characterized in that at × 10 6 ^[pieces / mL] or more.

The invention according to claim 4 is a method for generating ozone-dissolved water in which ozone is dissolved in water, wherein ozone-containing gas is generated in the water by electrolyzing the water. It is characterized in that a vibration satisfying the formula (1) is applied to water.
I = (2π × f × A ) 2 × Z 0 /2≧8.56×10 12 ··· (1)
I: Strength [W / m ² ]
f: Frequency [Hz]
A: Amplitude [m]
Z _0: acoustic impedance of water ^{(= 1.6 × 10 6 [kg} / (cm 2 · s)])

The invention according to claim 5 is a method for generating ozone-dissolved water in which ozone is dissolved in water, and the diameter is nano-order in the water of the ozone-dissolving portion to which water is sequentially supplied. While supplying an ozone-containing gas containing fine bubbles of the ozone-containing gas, ozone-dissolved water is generated in the ozone-dissolving part by applying a vibration of ^{0.5 × 10 4} [W / m ^{2] or more, and the ozone-dissolving part is generated.} It is characterized in that the same amount of ozone-dissolved water as the amount of water supplied to the gas-dissolved portion is sequentially released from the gas-dissolved portion.

Further, the invention according to claim 6 is characterized in that, in the method for generating ozone-dissolved water of the invention according to claim 5, the ozone-dissolved water generated in the ozone-dissolving portion is discharged from the ozone-dissolving portion as ozone mist. It is said.

As described above, in a state where fine bubbles of ozone-containing gas having a diameter of nano-order are present in ^{water, a vibration of 0.5 × 10 4} [W / m ² ] or more is applied to the water while being submerged in the water. In the method for generating ozone-dissolved water according to the first aspect of the present invention in which the ozone-containing gas is supplied, when the ozone-containing gas is supplied by bubbling or the like in water in which fine bubbles of the ozone-containing gas having a diameter of nano-order do not exist. In comparison, ozone-dissolved water having a high dissolved ozone concentration can be generated in a short time.

The fine bubbles of the ozone-containing gas having a diameter of nano-order need not be present in the water in advance, and the ozone-containing gas is supplied to the water as in the method for producing ozone-dissolved water according to the second aspect of the invention. The same effect can be obtained by generating fine bubbles of ozone-containing gas having a diameter of nano-order in water.

In particular, as the ozone-dissolved water producing method of the invention according to claim 3, the number concentration of fine bubbles of the ozone-containing gas having a diameter of nanometer order existing in water is 1.0 × 10 6 ^[pieces / mL] or If there is, it is possible to generate ozone-dissolved water having a higher concentration in a shorter time than when the concentration is lower than the number concentration.

In particular, when the electrolysis method is adopted, the strength I is 8.56 while generating ozone-containing gas in water by electrolyzing water as in the ozone-dissolved water generation method of the invention according to claim 3. By applying a vibration of × 10 ¹² [W / m ² ] or more to water, fine bubbles of ozone-containing gas having a diameter of nano-order ^{can be generated of 1.0 × 10 6} [pieces / mL] or more. Compared with a general electrolysis method in which ozone generated by electrolyzing water is dissolved in water, ozone-dissolved water having a high dissolved ozone concentration can be generated in a short time.

Further, when the ozone-dissolved water generation method of the invention according to claims 1 to 4 is used to dissolve ozone in still water, the dissolved ozone concentration in the still water increases immediately after the start of dissolution, but reaches a plateau with the passage of time. After that, it decreases, so as in the invention of claim 5, an ozone-containing gas containing fine bubbles of ozone-containing gas having a diameter of nano-order is placed in the water of the ozone-dissolving portion to which water is sequentially supplied. By applying a vibration of 0.5 × 10 ⁴ [W / m ² ] or more while supplying, ozone-dissolved water is generated in the ozone-dissolving part, and the same amount of ozone-dissolving as the amount of water supplied to the ozone-dissolving part is generated. It is desirable to use ozone-dissolved water having a high dissolved ozone concentration by sequentially releasing water from the gas-dissolving part.

When the ozone-dissolved water generation method of the invention according to claim 5 is adopted, the dissolved ozone concentration is determined by releasing the ozone mist from the ozone-dissolving portion as in the ozone-dissolved water generation method of the invention according to claim 6. High ozone mist can be released continuously.

It is the schematic which shows the ozone-dissolved water generation apparatus for carrying out the ozone-dissolved water generation method which concerns on this invention. It is a schematic block diagram which shows the electrode unit mounted on the ozone dissolution water generation apparatus of the above. It is a graph which shows the change of the dissolved ozone concentration of the ozone-dissolved water produced by the ozone-dissolved water generation method which concerns on this invention, and the ozone-dissolved water produced by a general electrolysis method. In the ozone-dissolved water generation method according to the present invention, it is a graph showing the influence of the number concentration of fine bubbles of ozone-containing gas having a diameter of nano-order in water on the dissolved ozone concentration of the generated ozone-dissolved water. It is the schematic which shows the modification of the ozone dissolution water generation apparatus of the same as above.

Hereinafter, the method for producing ozone-dissolved water of the present invention will be described with reference to the drawings. FIG. 1 shows an ozone-dissolved water generation device 1 for carrying out the ozone-dissolved water generation method according to the present invention. As shown in the figure, the ozone-dissolved water generator 1 has a storage tank 10 for storing tap water and a water electrolytic ozone generator that electrolyzes tap water stored in the storage tank 10 to generate ozone. The means 20 and the vibration applying means 30 for applying vibration to the water stored in the storage tank 10 are provided.

As shown in the figure, the water electrolytic ozone generating means 20 includes a plate-shaped electrode unit 21 that electrolyzes water to generate ozone, and a DC power supply device 24 that applies a DC voltage to the electrode unit 21. The electrode unit 21 is installed in a storage tank 10 in an upright state.

As shown in FIG. 2, the electrode unit 21 includes an anode plate 22 formed of a punching metal made of niobium coated with boron-doped diamond (BDD) and a cathode plate 23 formed of a punching metal made of SUS304. The electrode units 21 are alternately arranged with a slight gap between them, and a DC voltage is applied between the anode plate 22 and the cathode plate 23 in a state where the electrode units 21 are immersed in tap water stored in the storage tank 10. When applied, water is electrolyzed, ozone and oxygen are generated on the anode plate 22 side, and hydrogen is generated on the cathode plate 23 side.

As shown in FIG. 1, the vibration applying means 30 includes an oscillator 31 that vibrates tap water stored in the storage tank 10 and is arranged in the storage tank 10 in a state close to the electrode unit 21. It is composed of an oscillator 32 that applies a continuous wave AC signal to the oscillator 31, and has a predetermined frequency within the range of 20 [Hz] to 2 [MHz] in tap water stored in the storage tank 10. Vibration is applied continuously. As the vibrator 31, a Langevin type vibrator, a piezoelectric vibrator (piezo element) or the like can be used, and the vibrator may be appropriately selected according to the required frequency range.

Hereinafter, Examples 1 to 8 and Comparative Examples 1 to 12 of the present invention for generating ozone-dissolved water using the above-mentioned ozone-dissolved water generator 1 will be described with reference to Table 1, but the present invention is described below. Needless to say, it is not limited to the examples.

(Example 1)
As shown in Table 1, 3 [L] of tap water was introduced into the storage tank 10 and 12 [between the anode plate 22 and the cathode plate 23) immersed in the tap water stored in the storage tank 10. By applying a DC voltage of V] for 20 minutes, an ozone-containing gas is generated in the water in the storage tank 10, and the vibrator 31 causes the tap water in the storage tank 10 to have a frequency of 2 [MHz] and an amplitude of 2. Ozone-dissolved water was produced by continuously applying a vibration of .08 × ^{10-6 [m] for 20 minutes.} The intensity of the vibration applied to the tap water by the vibrator 31 at this time is 5.48 × 10 ¹⁴ [W / m ² ].

(Example 2)
As shown in Table 1, the voltage application time to the electrode unit 21 is 10 minutes, the amplitude of the vibration applied to the tap water in the storage tank 10 is 0.27 × ^10-6 [m], and the vibration application time is 10 minutes. Ozone-dissolved water was produced in the same manner as in Example 1 except for a certain point. The intensity of the vibration applied to the tap water by the vibrator 31 at this time is 9.48 × 10 ¹² [W / m ² ].

(Example 3)
As shown in Table 1, the same as in Example 2 except that the frequency of vibration applied to tap water in the storage tank 10 is 20 [kHz] and the amplitude is 41.1 × ^{10-6 [m].} In addition, ozone-dissolved water was generated. The intensity of the vibration applied to the tap water by the vibrator 31 at this time is 2.13 × 10 ¹³ [W / m ² ].

(Example 4)
As shown in Table 1, ozone-dissolved water is generated in the same manner as in Example 3 except that the amplitude of the vibration applied to the tap water in the storage tank 10 is 27.4 × ^{10-6 [m].} bottom. The intensity of the vibration applied to the tap water by the vibrator 31 at this time is 9.48 × 10 ¹² [W / m ² ].

(Example 5)
As shown in Table 1, the same as in Example 2 except that the frequency of vibration applied to tap water in the storage tank 10 is 100 [kHz] and the amplitude is 8.22 × ^{10-6 [m].} In addition, ozone-dissolved water was generated. The intensity of the vibration applied to the tap water by the vibrator 31 at this time is 2.14 × 10 ¹³ [W / m ² ].

(Example 6)
As shown in Table 1, ozone-dissolved water is generated in the same manner as in Example 5, except that the amplitude of the vibration applied to the tap water in the storage tank 10 is 5.48 × ^{10-6 [m].} bottom. The intensity of the vibration applied to the tap water by the vibrator 31 at this time is 9.48 × 10 ¹² [W / m ² ].

(Example 7)
As shown in Table 1, the same as in Example 2 except that the frequency of vibration applied to tap water in the storage tank 10 is 40 [kHz] and the amplitude is 27.4 × ^{10-6 [m].} In addition, ozone-dissolved water was generated. The intensity of the vibration applied to the tap water by the vibrator 31 at this time is 3.78 × 10 ¹³ [W / m ² ].

(Example 8)
As shown in Table 1, ozone-dissolved water is generated in the same manner as in Example 7, except that the amplitude of the vibration applied to the tap water in the storage tank 10 is 13.7 × ^{10-6 [m].} bottom. The intensity of the vibration applied to the tap water by the vibrator 31 at this time is 9.48 × 10 ¹² [W / m ² ].

(Comparative Example 1)
Ozone-dissolved water was produced in the same manner as in Example 1 except that no vibration was applied to the tap water in the storage tank 10.

(Comparative Example 2)
As shown in Table 1, ozone-dissolved water is generated in the same manner as in Example 2 except that the amplitude of the vibration applied to the tap water in the storage tank 10 is 0.25 × ^{10-6 [m].} bottom. The intensity of the vibration applied to the tap water by the vibrator 31 at this time is 7.68 × 10 ¹² [W / m ² ].

(Comparative Example 3)
As shown in Table 1, ozone-dissolved water is generated in the same manner as in Example 2 except that the amplitude of the vibration applied to the tap water in the storage tank 10 is 0.14 × ^{10-6 [m].} bottom. The intensity of the vibration applied to the tap water by the vibrator 31 at this time is 2.37 × 10 ¹² [W / m ² ].

(Comparative Example 4)
As shown in Table 1, ozone-dissolved water is generated in the same manner as in Example 5, except that the amplitude of the vibration applied to the tap water in the storage tank 10 is 4.11 × ^{10-6 [m].} bottom. The intensity of the vibration applied to the tap water by the vibrator 31 at this time is 5.34 × 10 ¹² [W / m ² ].

(Comparative Example 5)
As shown in Table 1, ozone-dissolved water is generated in the same manner as in Example 5, except that the amplitude of the vibration applied to the tap water in the storage tank 10 is 2.74 × ^{10-6 [m].} bottom. The intensity of the vibration applied to the tap water by the vibrator 31 at this time is 2.37 × 10 ¹² [W / m ² ].

(Comparative Example 6)
As shown in Table 1, ozone-dissolved water is generated in the same manner as in Example 3 except that the amplitude of the vibration applied to the tap water in the storage tank 10 is 24.7 × ^{10-6 [m].} bottom. The intensity of the vibration applied to the tap water by the vibrator 31 at this time is 7.68 × 10 ¹² [W / m ² ].

(Comparative Example 7)
As shown in Table 1, ozone-dissolved water is generated in the same manner as in Example 3 except that the amplitude of the vibration applied to the tap water in the storage tank 10 is 13.7 × ^{10-6 [m].} bottom. The intensity of the vibration applied to the tap water by the vibrator 31 at this time is 2.37 × 10 ¹² [W / m ² ].

(Comparative Example 8)
As shown in Table 1, ozone-dissolved water was produced in the same manner as in Example 3 except that the frequency of vibration applied to tap water in the storage tank 10 was 2 [kHz]. The intensity of the vibration applied to the tap water by the vibrator 31 at this time is 2.14 × 10 ¹¹ [W / m ² ].

(Comparative Example 9)
As shown in Table 1, ozone-dissolved water was produced in the same manner as in Example 3 except that the frequency of vibration applied to tap water in the storage tank 10 was 200 [Hz]. The intensity of the vibration transducer 31 at this time is applied to the tap water is ^{2.14 × 10 9 [W / m} 2].

(Comparative Example 10)
As shown in Table 1, ozone-dissolved water was produced in the same manner as in Example 3 except that the frequency of vibration applied to tap water in the storage tank 10 was 20 [Hz]. The intensity of the vibration transducer 31 at this time is applied to the tap water is ^{2.14 × 10 7 [W / m} 2].

(Comparative Example 11)
As shown in Table 1, ozone-dissolved water is generated in the same manner as in Example 7, except that the amplitude of the vibration applied to the tap water in the storage tank 10 is 12.3 × ^{10-6 [m].} bottom. The intensity of the vibration applied to the tap water by the vibrator 31 at this time is 7.68 × 10 ¹² [W / m ² ].

(Comparative Example 12)
As shown in Table 1, ozone-dissolved water is generated in the same manner as in Example 7, except that the amplitude of the vibration applied to the tap water in the storage tank 10 is 5.48 × ^{10-6 [m].} bottom. The intensity of the vibration applied to the tap water by the vibrator 31 at this time is 1.52 × 10 ¹² [W / m ² ].

Regarding the vibration amplitude, the amplitude voltage generated by the unimorph type piezoelectric element (C-8 manufactured by Fuji Ceramics Corporation) immersed in tap water in the storage tank 10 in response to the vibration applied by the vibrator 31. V was measured and calculated from the measured amplitude voltage V and the equivalent piezoelectric constant d31 of the piezoelectric element from the following equation (2).
A = d ₃₁ x V ... (2)
A: Amplitude [m]
d ₃₁ : Equivalent piezoelectric constant [m / V] (= -274 × ^10-12 )
V: Measured amplitude voltage [V]

The vibration intensity was calculated from the lower equation (3) from the frequency of the vibration applied to the tap water by the vibrator 31 and the amplitude calculated from the upper equation (2).
I = (2π × f × A) ² × Z _0/2・ ・ ・ (3)
I: Strength [W / m ² ]
f: Frequency [Hz]
A: Amplitude [m]
Z _0: acoustic impedance of water ^{(= 1.6 × 10 6 [kg} / (cm 2 · s)])

With respect to Example 1 and Comparative Example 1 described above, the dissolved ozone concentration of the ozone-dissolved water in the storage tank 10 was measured immediately after the start of generation of the ozone-containing gas by the water electrolytic ozone generating means 20, and the dissolved ozone meter (Custom Co., Ltd.) It was measured every 2 minutes using DOZ-1000PE), and the results are shown in the graph of FIG. In Example 1, a nanoparticle analysis system (Nanosite LM10 manufactured by Malvern) was used to determine the bubble diameter (mode diameter) and the number concentration of fine bubbles existing in the ozone-dissolved water in the storage tank 10 after 10 minutes had passed. was measured using the bubble diameter (mode diameter) is 118 [nm], the number density was confirmed to be 9.1 × 10 ⁸ [pieces / mL].

As can be seen from the graph of FIG. 3, in Example 1, the dissolved ozone concentration rapidly increased to 3.9 [mg / L] after 4 minutes, and increased to 5.7 [mg / L] after 12 minutes. However, in Comparative Example 1, the dissolved ozone concentration did not rise sharply in the initial stage, and while gradually rising, the dissolved ozone concentration reached a plateau at 4.0 [mg / L] after 16 minutes. ^{In Example 1 in which a vibration having an intensity I of 8.56 × 10 12} [W / m ² ] or more was applied to the water while generating an ozone-containing gas in the water by electrolyzing the water, the vibration was applied to the water. It was confirmed that ozone-dissolved water having a high dissolved ozone concentration can be generated in a short time as compared with Comparative Example 1 in which ozone-containing gas is simply generated in water by electrolyzing water without doing so.

Further, in Examples 2 to 8 and Comparative Examples 2 to 12 described above, the dissolved ozone concentration of the generated ozone-dissolved water was determined at the time when the application of vibration by the vibrator 31 was stopped (at the time when 10 minutes had passed). In addition to measuring using a meter (DOZ-1000PE manufactured by Custom Co., Ltd.), the bubble diameter (mode diameter) and number concentration of fine bubbles existing in the generated ozone-dissolved water are measured by a nanoparticle analysis system (Nanosite manufactured by Malvern). The measurement was performed using LM10), and the results are shown in Table 2. In Example 1 and Comparative Example 1, as described above, the dissolved ozone concentration of the ozone-dissolved water was measured every 2 minutes. Table 2 shows the dissolved ozone concentration after 10 minutes and 10 minutes. The bubble diameter (mode diameter) and the number concentration of fine bubbles existing in the ozone-dissolved water at the elapsed time are shown.

As can be seen from Table 2, the ozone-dissolved waters obtained in Examples 2 to 8 in which the intensity I of the vibration applied by the vibrator 31 is 8.56 × 10 ¹² [W / m ^{2] or more have a dissolved ozone concentration.} It was as high as 4.77 [mg / L] to 5.63 [mg / L], but the intensity I of the applied vibration ^{was less than 8.56 × 10 12} [W / m ² ] in Comparative Examples 2 to 12. The obtained ozone-dissolved water had a low dissolved ozone concentration of 3.33 [mg / L] to 4.10 [mg / L]. ^{From this, when the electrolysis method is adopted, vibration with an intensity I of 8.56 × 10 12} [W / m ² ] or more is applied to the water while generating an ozone-containing gas in the water by electrolyzing the water. By applying the gas, ozone-dissolved water having a high dissolved ozone concentration can be generated in a short time as compared with a general electrolysis method in which ozone generated by electrolyzing water is simply dissolved in water.

Further, as can be seen from Table 2, the ozone-dissolved water obtained in Examples 2 to 8 in which the intensity I of the vibration applied by the vibrator 31 is 8.56 × 10 ¹² [W / m ^{2] or more contains bubbles.} before and after diameter (mode diameter) is 100 nm, the number density can be confirmed that the ozone-containing fine bubbles of 9.5 × 10 ⁸ [pieces /mL]~6.7×10 ⁸ [pieces / mL] is present rice field. On the other hand, the ozone-dissolved waters obtained in Comparative Examples 2 to 12 in which the intensity I of the applied vibration ^{was less than 8.56 × 10 12} [W / m ^{2] were cloudy and contained ozone of 3 μm or more.} It is considered that a large amount of bubbles are generated. Therefore, the nanoparticle analysis system could not measure the bubble diameter and the number concentration of nano-sized fine bubbles.

Next, in order to investigate the effect of the number concentration of fine bubbles of ozone-containing gas having a diameter of nano-order on the dissolved ozone concentration of the generated ozone-dissolved water, the number concentration of fine bubbles of ozone-containing gas having a diameter of nano-order is investigated. Was changed to generate ozone-dissolved water.

(Example 9)
The bubble diameter (mode diameter) is 100 number concentration of fine bubbles [nm] about the ozone-containing gas is 1.0 × 10 7 ^[pieces / mL] in which fine-bubble-containing water 3 [L] to create, the fine while passing ozone gas into the bubble-containing water 1000 [ppm], the frequency is 4 [kHz], the amplitude in the 1.0 × ^{10 -3} [m], the intensity is ^{5.05 × 10 8 [W / m} 2] Ozone-dissolved water was generated by continuously applying the vibration of the above for 20 minutes.

(Example 10)
Number concentration of fine bubbles of the bubble diameter (mode diameter) is 100 [nm] about the ozone-containing gas present in the fine-bubble-containing water, except that it is 1.0 × 10 6 ^[pieces / mL], carried Ozone-dissolved water was produced in the same manner as in Example 9.

(Example 11)
Number concentration of fine bubbles of the bubble diameter (mode diameter) is 100 [nm] about the ozone-containing gas present in the fine-bubble-containing water, except that it is 1.0 × 10 5 ^[pieces / mL], carried Ozone-dissolved water was produced in the same manner as in Example 9.

(Comparative Example 13)
Ozone-dissolved water was produced in the same manner as in Example 9, except that water having no fine bubbles of ozone-containing gas was used.

With respect to Examples 9 to 11 and Comparative Example 13 described above, the dissolved ozone concentration of the ozone-dissolved water generated immediately after the start of ventilation of ozone gas was measured every 2 minutes using a dissolved ozone meter (DOZ-1000PE manufactured by Custom Co., Ltd.). The results were shown in the graph of FIG.

Figure As can be seen from the graph of 4, the ozone-containing gas in Examples 10 and 11 the number concentration of fine bubbles is 1.0 × 10 6 ^[pieces / mL] or more, the dissolved ozone concentration in 4 minutes elapse 5 soared [mg / L] or more, and the elapsed time 10 minutes was increased to 6 [mg / L] before and after, the number concentration of fine bubbles of the ozone-containing gas is 1.0 × 10 6 ^the number / mL] In Example 12, which is lower than that, the dissolved ozone concentration at the lapse of 4 minutes increased only to 3.5 [mg / L], and the dissolved ozone concentration at the lapse of 10 minutes increased only to 4.8 [mg / L], and the gas content was contained. In Comparative Example 13 in which no gaseous fine bubbles were present, the dissolved ozone concentration did not rise sharply in the initial stage, but gradually increased, and the dissolved ozone concentration increased after 16 minutes, as in Comparative Example 1. It peaked at 4.5 [mg / L].

From the above, when ozone-dissolved water is generated by supplying ozone gas or ozone-containing gas to water, vibration is applied to water in a state where fine bubbles of ozone-containing gas having a diameter of nano-order are present. As a result, it was confirmed that ozone-dissolved water with a high dissolved ozone concentration can be generated in a short time. In particular, in order to increase the dissolution efficiency of ozone, the number concentration of fine bubbles of the ozone-containing gas having a diameter which is present when generating the ozone-dissolved water nano order, 1.0 × 10 6 ^[pieces / mL] or more to It is desirable to keep it.

In Examples 9 to 11 described above, the strength is applied to the vibration of ^{5.05 × 10 8 [W / m} 2] in water, is not limited thereto, are prepared in advance, When supplying ozone gas or ozone-containing gas to fine bubble-containing water in which fine bubbles of ozone-containing gas having a diameter of nano-order are present, or by applying fine bubbles of ozone-containing gas having a diameter of nano-order to water by a method other than vibration application. When ozone gas or ozone-containing gas is supplied to the water while being generated in, the intensity of vibration applied to the water to dissolve the supplied ozone gas or ozone-containing gas in water is 0.5 × 10 ⁴ [W. / M ² ] or more.

Further, as can be seen from the graphs shown in FIGS. 3 and 4, when ozone is dissolved in still water by using the ozone-dissolved water generation method of the present invention, the dissolved ozone concentration in the still water increases immediately after the start of dissolution. However, it reaches a plateau with the passage of time and then decreases, so it is desirable to use ozone-dissolved water generated before the dissolved ozone concentration decreases. Therefore, when an ozone-containing gas is generated in water by electrolyzing water as in Examples 1 to 8, water electrolytic ozone generation is performed, for example, as in the ozone-dissolved water generator 2 shown in FIG. While continuously supplying tap water to the storage tank 10 in which the electrode unit 21 of the means 20 and the vibrator 31 of the vibration applying means 30 are arranged, the electrode unit 21 puts an ozone-containing gas into the water in the storage tank 10. Is generated, and ozone-dissolved water is generated in the storage tank 10 by applying vibration having a ^{strength I of 8.56 × 10 12} [W / m ² ] or more to the tap water in the storage tank 10 by the vibrator 31. Then, the same amount of ozone-dissolved water as the amount of tap water supplied to the storage tank 10 may be sequentially discharged from the storage tank 10 to use the ozone-dissolved water having a high dissolved ozone concentration. An example of the use of ozone-dissolved water is ozone mist, and in that case, the same amount of tap water as the ozone-dissolved water released as ozone mist is supplied to the storage tank 10.

The present invention can be used to generate ozone-dissolved water in which ozone is dissolved in water.

1, 2 Ozone-dissolved water generator 10 Storage tank 20 Water electrolysis type ozone generation means 21 Electrode unit 22 Anode plate 23 Cathode plate 24 DC power supply device 30 Vibration application means 31 Oscillator 32 Oscillator

Claims (6)

It is an ozone-dissolved water generation method that produces ozone-dissolved water in which ozone is dissolved in water.
Ozone-containing gas is supplied to the water while applying vibration of ^{0.5 × 10 4} [W / m ² ] or more to the water in a state where fine bubbles of ozone-containing gas having a diameter of nano-order are present in the water. A method for producing ozone-dissolved water. The ozone-dissolved water generation method according to claim 1, wherein fine bubbles of the ozone-containing gas having a diameter of nano-order are generated in water while supplying the ozone-containing gas into water. The number concentration of fine bubbles of the ozone-containing gas having a diameter of nanometer order existing in water, 1.0 × 10 6 ^[pieces / mL] or the ozone-dissolved water producing method according to claim 1 or 2. It is an ozone-dissolved water generation method that produces ozone-dissolved water in which ozone is dissolved in water.
A method for generating ozone-dissolved water, which comprises applying vibration satisfying the following equation (1) to water while generating ozone-containing gas in the water by electrolyzing water.
I = (2π × f × A ) 2 × Z 0 /2≧8.56×10 12 ··· (1)
I: Strength [W / m ² ]
f: Frequency [Hz]
A: Amplitude [m]
Z _0: acoustic impedance of water ^{(= 1.6 × 10 6 [kg} / (cm 2 · s)]) It is an ozone-dissolved water generation method that produces ozone-dissolved water in which ozone is dissolved in water.
While supplying an ozone-containing gas containing fine bubbles of ozone-containing gas having a diameter of nano-order into the water of the ozone-dissolving part to which water is sequentially supplied ^{, vibration of 0.5 × 10 4} [W / m ² ] or more is vibrated. A method for generating ozone-dissolved water, which comprises generating ozone-dissolved water in the ozone-dissolving part by applying the ozone-dissolved water, and sequentially releasing the same amount of ozone-dissolved water as the amount of water supplied to the ozone-dissolving part from the ozone-dissolving part. The method for producing ozone-dissolved water according to claim 5, wherein the ozone-dissolved water generated in the ozone-dissolving portion is discharged from the ozone-dissolving portion as ozone mist.

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