JP4309565B2 - Ozone aqueous solution generation method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an ozone aqueous solution generation method for generating an ozone aqueous solution by dissolving ozone gas in water, and more particularly to an ozone aqueous solution generation method capable of maintaining an ozone gas dissolved state in the ozone aqueous solution.
[0002]
[Prior art]
Conventionally, there is one shown in FIG. 15 as an ozone water generating apparatus for carrying out this type of ozone aqueous solution generating method, and FIG. 15 shows a schematic configuration diagram of the conventional ozone water generating apparatus.
In the figure, a conventional ozone water generator is configured to pressurize ozone gas generated by an ozone generator 11 with a pressurizer 12 and mix the pressurized ozone gas with water in a mixer 13 to generate an aqueous ozone solution. It is. A jet apparatus is formed by the pressurizer 12 and the mixer 13, and ozone gas can be dissolved in water by filling the water introduced into the mixer 13 with the jet of ozone gas pressurized by the pressurizer 12. it can.
[0003]
When the generated aqueous ozone solution is used as washing water for food items, tableware, etc., it is supplied from the mixer 13 through the feed pipe 14 while washing these food items, tableware, etc. It can be sterilized.
[0004]
[Problems to be solved by the invention]
Since the conventional ozone water generating apparatus was configured as described above, the generated ozone aqueous solution supplied from the mixer 13 was discharged from the faucet of the feeding pipe 14 when passing through the feeding pipe 14. Later, ozone gas was separated from water, and the ozone dissolved amount of the aqueous ozone solution was attenuated. In addition, the attenuation of the ozone dissolved amount also deteriorates the sterilizing ability and the purifying ability of the ozone aqueous solution, and the desired sterilizing ability is obtained unless a high-concentration ozone aqueous solution having a high ozone dissolved amount in consideration of exhaust ozone gas is supplied. The ozone aqueous solution and the purification ability were not obtained, and there was a problem that a desired effect could not be obtained unless used in combination with a bactericide such as sodium hypochlorite.
[0005]
In particular, when the generated aqueous ozone solution is used as cleaning water, the separated waste ozone gas fills the cleaning process site, and there is a concern that there may be a health hazard for the cleaning operator engaged in the cleaning process. In addition, there is a problem that the working environment is poor. In order to improve such a problem, it is also conceivable that the cleaning process is a completely sealed processing system, or the cleaning process site is unmanned to form a fully automatic cleaning system. However, each of these processing systems has a problem that the system configuration becomes complicated and large, and the facility cost increases.
[0006]
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an ozone aqueous solution generation method capable of maintaining the amount of ozone dissolved in the ozone aqueous solution in the initial state of generation.
[0007]
[Means for Solving the Problems]
Aqueous ozone solution producing method according to the present invention, ozone to feed the cleaning tank for cleaning an object such as vegetables, the aqueous ozone solution generation method of ozone gas dissolved in water to produce an aqueous ozone solution, the ozone water solution When the concentration is 0.6 mg / l to 10 mg / l, an ozone aqueous solution generated by dissolving the ozone gas in water when supplying the cleaning tank with a hydrogen ion concentration of pH 2.01 to pH 3.0. A part of the water is split, and an organic acid is added to the shunted ozone aqueous solution to generate a split ozone aqueous solution in which the hydrogen ion concentration is adjusted to pH 1.4 or lower, and the hydrogen ion concentration is adjusted to pH 1.4 or lower. The separated ozone aqueous solution and the remaining main stream ozone aqueous solution are mixed, and the hydrogen ion concentration of the mixed ozone aqueous solution is adjusted to pH 2.01 to 2.01. The pH is adjusted to 3.0 . As described above, in the present invention, an organic acid is added to a divided ozone aqueous solution obtained by dividing a part of the ozone aqueous solution, and the added divided ozone aqueous solution and the ozone aqueous solution are mixed to adjust the hydrogen ion concentration to pH 2.01 to pH 3. 0.0, and by adjusting the ozone concentration and hydrogen ion concentration of the generated ozone aqueous solution to predetermined values, separation of ozone gas adjusted to the optimum hydrogen ion concentration after generation of the ozone aqueous solution and dissolved in water Can be suppressed as much as possible, and the amount of ozone dissolved in the ozone aqueous solution in the washing tank for washing the object such as vegetables can be maintained in the original state.
[0009]
The ozone aqueous solution generation method according to the present invention stores, as necessary, a diverted ozone aqueous solution whose hydrogen ion concentration is adjusted to pH 1.4 or less in a cleaning tank, and the stored diverted ozone aqueous solution of pH 1.4 or less is An aqueous ozone solution is mixed at a predetermined mixing ratio to adjust the hydrogen ion concentration to pH 2.01 to pH 3.0. As described above, in the present invention, the ozone aqueous solution having a hydrogen ion concentration of pH 2.01 to pH 3.0 is generated by mixing the aqueous ozone solution and the aqueous ozone solution adjusted to pH 1.4 or less in the cleaning tank at a predetermined ratio. Thus, the dissociation of the ozone gas from the generated aqueous ozone solution can be suppressed as much as possible, so that the concentration of the aqueous ozone solution can be maintained and safety in use can be ensured.
[0010]
Aqueous ozone solution generating method according to the present invention, if necessary, the aqueous ozone solution injection pressure is to mix at approximately ^{1kg / cm 2 ~30kg / cm 2} . As described above, in the present invention, since the ozone aqueous solution is mixed at a high injection pressure of about 110 g / ^{cm 2 to} 30 kg / cm ² , dissociation of ozone gas from the generated ozone aqueous solution can be suppressed as much as possible. The concentration of the aqueous solution can be maintained and safety can be ensured during use.
[0012]
The ozone aqueous solution production | generation method based on this invention adjusts each value of ozone concentration and hydrogen ion concentration so that it may conflict, as needed. Thus, in the present invention, by adjusting the ozone concentration and the hydrogen ion concentration so as to have opposite values, dissociation of the ion gas can be suppressed as much as possible according to the use of the ozone aqueous solution of each ozone concentration, A highly functional and safe ozone aqueous solution suitable for the intended use can be generated.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment of the present invention)
Hereinafter, an ozone aqueous solution generation method according to a first embodiment of the present invention will be described based on FIGS. 1 to 4 together with an apparatus for performing the ozone aqueous solution generation method. FIG. 1 is an overall block diagram of an ozone aqueous solution generation apparatus that implements an ozone aqueous solution generation method according to the present embodiment. FIGS. 2 and 3 show the pH concentration and ozone concentration of the ozone aqueous solution generated by the apparatus shown in FIG. FIG. 4 is a characteristic diagram of an aqueous ozone solution generated by the apparatus shown in FIG.
[0014]
In each of the drawings, the ozone aqueous solution generation method according to the present embodiment pressurizes the ozone gas generated by the ozone generator 11 with the pressurizer 12 and supplies it to the mixer 13. The mixer 13 mixes the ozone gas with water. Then, an aqueous ozone solution is generated, citric acid is added to the diverted ozone aqueous solution obtained by dividing a part of the ozone aqueous solution by the flow divider 21, and the hydrogen ion concentration is adjusted by the pH adjusting unit 31. The aqueous ozone solution is agitated and mixed in the adjusting and mixing unit 41, and the adjusted split-flow ozone aqueous solution and the ozone aqueous solution are mixed in the washing tank 5 as a storage tank to adjust the hydrogen ion concentration to pH 2.01 to pH 3.0. It is a configuration.
[0015]
When the hydrogen ion concentration of the ozone aqueous solution generated by the mixer 13 is about pH 5, the pH adjusting unit 31 adds citric acid so that the hydrogen ion concentration of the split ozone aqueous solution becomes pH 1 to pH 1.4. Adjust.
When the hydrogen ion concentration of the ozone aqueous solution is about pH 5, and the hydrogen ion concentration of the diverted ozone aqueous solution is about pH 1 to pH 1.4, the main flow valve 14a and the diversion valve 15a are adjusted to have a diversion ratio of 250: 1. To supply to the washing tank 5.
[0016]
Next, the amount of ozone dissolved in the ozone aqueous solution generation method according to this embodiment based on the above configuration will be described based on experimental data. As shown in FIG. 2, the hydrogen ion concentration of the ozone aqueous solution is adjusted to pH 2.01 to pH 6.77, the time change of the hydrogen ion concentration in each ozone aqueous solution is different, and the ozone concentration decrease created based on FIG. The rate is as shown in FIG. FIG. 4 is a characteristic diagram of ozone concentration and elapsed time in FIG.
[0017]
In FIG. 4, it can be seen that the decrease rate of the hydrogen ion concentration of the aqueous ozone solution is extremely small. On the other hand, when the hydrogen ion concentration of the ozone aqueous solution is about pH 4.5 or more, it can be seen that the rate of decrease of the ozone concentration is extremely large.
Thus, by adjusting the hydrogen ion concentration of the ozone aqueous solution to pH 2.01 to pH 3.0, dissociation of ozone gas in the ozone aqueous solution can be suppressed as much as possible, and the remaining amount of ozone can be maintained.
[0018]
(Second embodiment of the present invention)
Hereinafter, the ozone aqueous solution production | generation method which concerns on the 2nd Embodiment of this invention is demonstrated based on FIG. FIG. 5 shows an overall block configuration diagram of an ozone aqueous solution generation apparatus that implements the ozone aqueous solution generation method according to the second embodiment.
In the figure, in the ozone aqueous solution generation method according to the second embodiment, the pH adjusting unit 32 adds an organic acid (for example, citric acid) to water to adjust the hydrogen concentration of the water to pH 2.01 to pH 3.0. Then, the ozone gas generated by the ozone generator 11 is pressurized by the pressurizer 12, and the pressurized ozone gas and the water whose hydrogen ion concentration is adjusted are mixed by the adjustment mixing unit 42 via the feed pipe 14. And supply to the cleaning tank 5 of the storage tank.
[0019]
The adjusting mixing unit 42 is configured to mix the ozone gas at about 1 kg / cm ² injection pressure 30 kg / cm ² to about 8l / min of water the hydrogen ion concentration is adjusted. As described above, since ozone gas is mixed with water whose hydrogen ion concentration is adjusted to pH 2.01 to pH 3.0 in advance, dissociation of ozone gas in the aqueous ozone solution is suppressed as much as possible in the same manner as in the first embodiment. The remaining amount of ozone can be maintained.
[0020]
In this embodiment, ozone gas may be mixed in the adjustment mixing unit 42, and the pH adjustment unit 32 may adjust the hydrogen ion concentration with respect to the ozone aqueous solution mixed in the subsequent stage of the adjustment mixing unit 42. .
(Third embodiment of the present invention)
Hereinafter, the ozone aqueous solution production | generation method which concerns on the 3rd Embodiment of this invention is demonstrated based on FIG. FIG. 6 shows an overall block configuration diagram of an ozone aqueous solution generation apparatus that implements the ozone aqueous solution generation method according to the third embodiment.
[0021]
In the figure, the ozone aqueous solution generation method according to the third embodiment is similar to the ozone aqueous solution generation method shown in FIG. 1, in that the ozone generator 11, the pressurizer 12, the mixer 13, the flow divider 21, and the pH adjuster 31. The adjustment mixing unit 41 and the washing tank 5 are provided in common, and in addition to this configuration, an organic acid supply unit 32 that supplies an organic acid such as citric acid to the pH adjustment unit 31, and an organic acid of the organic acid supply unit 32 A control calculation unit 10 that controls the amount of ozone gas generated from the ozone generator 11, an input unit 10 a that inputs various commands to the control calculation unit 10, and the control calculation unit And a recording unit 10b for storing data such as 10 control results.
[0022]
The control calculation unit 10 receives water amount data flowing into the mixer 13 from a flow rate sensor (not shown), and the ozone concentration is 0.6 mg / l to 10 mg / l based on the water amount data. The ozone generator 11 is controlled at the same time, and the amount of organic acid supplied from the organic acid supply unit 32 supplied to the mixer 13 is changed to a pH value of about 2.01 to 3.0 by using a split ozone aqueous solution divided by the flow divider 21. It is the structure which controls so that it may become a density | concentration. Further, the control calculation unit 10 controls the ozone concentration and the hydrogen ion concentration so as to have opposite values, and controls the ozone concentration according to the use of the generated aqueous ozone solution.
[0023]
For example, when using an aqueous ozone solution for washing vegetables, the control is performed as shown in FIG. When the vegetable is an onion having a relatively small number of bacteria, the ozone concentration is about 0.6 mg / l and the hydrogen ion concentration is controlled to about pH 3.0. On the other hand, when the burdock has a large number of bacteria among vegetables, the ozone concentration is about 10 mg / l and the hydrogen ion concentration is controlled to be about pH 2.01.
[0024]
In this way, by controlling the ozone concentration and hydrogen ion concentration of ozone aqueous solutions having different ozone concentrations by the control calculation unit 10, the dissociation of the ion gas can be suppressed as much as possible, and it is highly functional and safe for use. A high ozone aqueous solution can be produced.
The control data controlled by the control calculation unit 10 is stored in the recording unit 10b as past history data, and can be controlled by the control calculation unit 10 based on the history data during subsequent control.
[0025]
【Example】
An experiment using the ozone aqueous solution generated by the ozone aqueous solution generation method according to each of the embodiments described above for washing vegetables was performed, and the experimental results are shown in FIGS.
The ozone aqueous solution used in this experiment had an ozone concentration of about 3.0 ppm and hydrogen ion concentrations of four types of pH 2.01, pH 3.5, pH 4.5, and pH 6.7. Carrots, peppers, Chinese cabbage, onions, long onions, cabbage, and strawberries were immersed in these four types of ozone aqueous solutions for 30 to 60 minutes, respectively, to determine the sterilization results of bacteria.
[0026]
As shown in FIGS. 8 to 14, when the hydrogen ion concentration is pH 2.01 and pH 3.4, the decrease in the number of bacteria is confirmed more reliably than other hydrogen ion concentrations (pH 4.5 and pH 6.7). From this, it is understood that dissociation of ozone gas in the aqueous ozone solution is suppressed and the bacterial effect is high.
In the ozone aqueous solution generation method according to each of the above embodiments, the adjustment of the hydrogen ion concentration of the aqueous solution is adjusted by adding an organic acid, but the aqueous solution is electrolyzed to generate acidic water and alkaline water, It can also be set as the structure which adjusts a hydrogen ion concentration by changing the ratio of this acidic water and alkaline water.
[0027]
As described above, in the present invention, an organic acid is added to a diverted ozone aqueous solution in which a part of the ozone aqueous solution is diverted to generate a diverted ozone aqueous solution in which the hydrogen ion concentration is adjusted to pH 1.4 or less. The remaining main-stream ozone aqueous solution divided into the divided ozone aqueous solution adjusted to pH 1.4 or less is mixed to adjust the hydrogen ion concentration to pH 2.01 to pH 3.0. By adjusting the hydrogen ion concentration to a predetermined value, it is possible to suppress the separation of ozone gas dissolved in water by adjusting to the optimal hydrogen ion concentration after generating the aqueous ozone solution, and wash the objects such as vegetables The amount of ozone dissolved in the ozone aqueous solution can be maintained in the original state.
[0029]
In particular, the shunt aqueous ozone solution to adjust the hydrogen ion concentration in pH1.4 or less were stored in the cleaning tank, the reservoir is the hydrogen ion concentration is mixed with a predetermined ratio of ozone aqueous solution of mainstream side to shunt aqueous ozone solution was the pH 2. Since an ozone aqueous solution having a pH of 01 to 3.0 is generated, dissociation of ozone gas from the generated ozone aqueous solution can be suppressed as much as possible, and the concentration of the aqueous ozone solution can be maintained and safety can be ensured during use. Have.
[0030]
In the present invention, since the injection pressure is to mix the aqueous ozone solution in the injection pressure of about ^{1kg / cm 2 ~30kg / cm 2} , will be from the generated ozone aqueous solution as much as possible suppress the dissociation of the ozone gas, The concentration of the aqueous ozone solution can be maintained and safety can be ensured during use.
[0031]
Furthermore, in the present invention, by adjusting the ozone concentration and the hydrogen ion concentration to be opposite values, the dissociation of the ion gas can be suppressed as much as possible according to the use of the ozone aqueous solution of each ozone concentration. It has the effect of producing a highly functional and safe ozone aqueous solution suitable for the application.
[Brief description of the drawings]
FIG. 1 is an overall block configuration diagram of an ozone aqueous solution generation apparatus for performing an ozone aqueous solution generation method according to a first embodiment of the present invention.
FIG. 2 is a diagram showing an experimental example relating to changes in pH concentration and ozone concentration of an aqueous ozone solution generated by the apparatus shown in FIG. 1;
FIG. 3 is an experimental example regarding the transition of pH concentration and ozone concentration of an aqueous ozone solution generated by the apparatus shown in FIG. 1;
FIG. 4 is a characteristic diagram relating to the transition of the pH concentration and ozone concentration of an aqueous ozone solution generated by the apparatus described in FIG. 1;
FIG. 5 is an overall block configuration diagram of an ozone aqueous solution generation apparatus for performing an ozone aqueous solution generation method according to a second embodiment of the present invention.
FIG. 6 is an overall block configuration diagram of an ozone aqueous solution generation apparatus for performing an ozone aqueous solution generation method according to a third embodiment of the present invention.
FIG. 7 is a control characteristic diagram of a control calculation unit in an ozone aqueous solution generation apparatus that performs an ozone aqueous solution generation method according to a third embodiment of the present invention.
FIG. 8 is an experimental data diagram when an ozone aqueous solution generated by an ozone aqueous solution generation method according to each embodiment of the present invention is used for washing vegetables.
FIG. 9 is an experimental data diagram in a case where an ozone aqueous solution generated by the ozone aqueous solution generation method according to each embodiment of the present invention is used for washing vegetables.
FIG. 10 is an experimental data diagram when an ozone aqueous solution generated by the ozone aqueous solution generation method according to each embodiment of the present invention is used for vegetable washing.
FIG. 11 is an experimental data diagram when an ozone aqueous solution generated by the ozone aqueous solution generation method according to each embodiment of the present invention is used for washing vegetables.
FIG. 12 is an experimental data diagram in the case where an ozone aqueous solution generated by an ozone aqueous solution generation method according to each embodiment of the present invention is used for washing vegetables.
FIG. 13 is an experimental data diagram when an ozone aqueous solution generated by an ozone aqueous solution generation method according to each embodiment of the present invention is used for washing vegetables.
FIG. 14 is an experimental data diagram in a case where an ozone aqueous solution generated by an ozone aqueous solution generation method according to each embodiment of the present invention is used for washing vegetables.
FIG. 15 is a schematic configuration diagram of a conventional ozone water generator.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 5 Washing tank 10 Control calculating part 10a Input part 10b Recording part 11 Ozone generator 12 Pressurizer 13 Mixer 14 Feed pipe 14a Main flow valve 15 Input / output part 15a Splitting valve 21 Splitter 31 pH adjustment part 32 Organic acid supply part 41 Adjustment mixing section 42 Adjustment mixing section

Claims (3)

In an ozone aqueous solution generation method for generating an ozone aqueous solution by dissolving ozone gas in water in order to supply a washing tank for washing an object such as vegetables,
When the ozone aqueous solution has an ozone concentration of 0.6 mg / l to 10 mg / l, the ozone gas is dissolved in water when the hydrogen ion concentration is supplied to the cleaning tank so as to be pH 2.01 to pH 3.0. A part of the ozone aqueous solution generated in the step is divided, and an organic acid is added to the diverted aqueous ozone solution to be divided to generate a dilute ozone aqueous solution in which the hydrogen ion concentration is adjusted to pH 1.4 or less,
The hydrogen ozone concentration is adjusted to a pH of 1.4 or less to store a diverted ozone aqueous solution in a washing tank, and the remaining diverted ozone aqueous solution having a pH of 1.4 or less is mixed with the remaining mainstream ozone aqueous solution.
Adjusting the hydrogen ion concentration of the mixed aqueous ozone solution to pH 2.01 to pH 3.0. In the ozone aqueous solution production | generation method of the said Claim 1 ,
Aqueous ozone solution generating method, characterized in that the aqueous ozone solution injection pressure mixing at about ^{1kg / cm 2 ~30kg / cm 2} . In the ozone aqueous solution production | generation method of the said Claim 1 or 2 ,
When the ozone concentration is increased from 0.6 mg / l to 10 mg / l, the hydrogen ion concentration is decreased from pH 3.0 to pH 2.01, while the ozone concentration is decreased from 10 mg / l to 0.6 mg / l. And adjusting the ozone concentration and the hydrogen ion concentration so that the hydrogen ion concentration is increased from pH 2.01 to pH 3.0 so that the respective values of the ozone concentration and the hydrogen ion concentration are contradictory to each other.

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