JPH06277476A - Production of ozonic water - Google Patents

Abstract

PURPOSE:To provide a method for easily producing high-concentration ozonic water wherein absorption of ozone has been low and high-concentration ozonic water has not efficiently been produced in the conventional method in the case of dissolving gas containing ozone into water to be treated and producing ozonic water. CONSTITUTION:While water 4 to be treated is impressed with a magnetic field of 100-5000 gauss through coils 5, 6 and a permanent magnet, it is brought into contact with gas containing ozone to dissolve ozone. Further water to be treated is previously passed through the magnetic field and brought into contact with gas containing ozone to dissolve ozone. The molecular structure of water to be treated is changed by impressing the magnetic field and absorption of ozone is enhanced and high-concentration ozonic water is easily produced. Since ozonic water dissolved with ozone equal to heretofore or more is produced by gas containing a small amount of ozone, an ozonizer and an ozone dissolving tank are miniaturized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing high-concentration ozone water used for ozone treatment of swimming pools and foods.

[0002]

2. Description of the Related Art Ozone has a stronger oxidizing power than chlorine, has an effect on sterilization, deodorization, decolorization, etc., and since it decomposes into oxygen after the oxidative action and does not cause the problem of secondary pollution, ozone of recent years has The range of use is expanding, and ozone is used in various fields such as water treatment of semiconductor washing water, medical treatment, and food related fields. Ozone is normally used for various purposes as ozone water, but it decomposes in a short time and is converted into oxygen.Therefore, an ozone generator is installed at the place where ozone water is used and ozone generated is dissolved in water while generating ozone. Although there is a problem that it must be done, its use tends to be expanded because it has an effective bactericidal action as described above and there is no problem of secondary pollution.

Ozone water is generally produced by blowing ozone-containing gas into water. However, in large-scale facilities such as water purification plants, the time of contact with the blown water is 5 to 10 m in deep water. It is possible to sufficiently promote dissolution, and ozone water can be produced with an absorption rate of almost 100% .However, in small facilities such as pool water treatment, due to capacity reasons, contact time with water, that is, water surface It is not possible to ensure a sufficient depth from the injection site to the injection point, and the solution is melted while controlling the flow of water and gas in the dissolution tower having a depth of at most about 2 m. Therefore, the absorption rate of ozone-containing gas with an ozone concentration of 3 to 4% by weight obtained with a discharge method ozonizer using air as a raw material is about 30 to 40%, and the ozone concentration obtained with an electrolysis method ozonizer is 18 to 20%. The absorption rate of heavy ozone-containing gas was also about 85-95%.

Further, a method has been proposed in which the inside of the dissolution tower is agitated in order to promote the contact between water and the ozone-containing gas, or the ozone-containing gas is blown into the dissolution tower by using a stirring pump. It has a characteristic that it is easily decomposed in a liquid flow or by impact, and because the equipment is complicated and requires a special pump and the operating conditions of the pump are restricted, there are many restrictions from the operating conditions of the ozone device. However, few methods have been put to practical use, and the absorption rate of ozone by the discharge method was 50 to 70% at best, which was not a satisfactory absorption rate. As mentioned above, it is possible to produce the target ozone by enlarging the melting equipment,
There is a problem that the amount of waste ozone also increases and a large-scale facility for decomposing this waste ozone is required.

In addition to the absorptivity described above, a high ozone water concentration is often required as a condition required for ozone water production. Since ozone in ozone water can be considered to be dissolved as a gas for the purpose of sterilization or COD decomposition in waste liquid, the solubility of gas in water is determined by the concentration of injected ozone gas. For example, using 2-3% ozone-containing gas produced by a normal discharge ozonizer
It is a difficult technique to produce ozone water having a concentration of about 10 ppm, and even if an ozone-containing gas having a concentration of 10% or more is used, the concentration of ozone water obtained is at most 20 ppm. From the conventional theory of ozone dissolution, efforts have been made to further improve this solubility, but since the treatment process with ozone was examined on the premise of low ozone water concentration,
Its field of application was limited.

In order to effectively utilize the relatively dilute conventional ozone water, a method has been proposed in which a magnetic field is applied during the treatment of ozone water to sterilize vegetables while removing the migrating bacteria. Kaihei 4-152873), but this method had limited applications because it was necessary to apply a magnetic field during ozone treatment. When particularly high-concentration ozone water is required, ozone water and ozone-containing gas are used together, that is, by treating the ozone-containing gas with high concentration while passing it through the ozone water, ozone water with substantially higher concentration can be obtained. Although a method has been developed in which the same effect as that obtained by the treatment with ozone is obtained, this method also has a drawback that the overall utilization efficiency of ozone is reduced.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for producing ozone water which can eliminate the above-mentioned problems of the prior art and can produce highly concentrated ozone water with a high absorption rate.

The present invention relates to a method for producing ozone water by contacting ozone-containing gas with water to be treated to dissolve ozone in the water to be treated.
It is a method for producing ozone water, characterized in that ozone is dissolved while applying a magnetic field of 0 to 5000 Gauss, and the magnetic field may be applied to the water to be treated before contacting the ozone-containing gas. The present invention will be described in detail below.

It is known that when a magnetic field is applied to water, the molecular structure of the water changes slightly due to the magnetic field, resulting in what is called magnetized water. Magnetized water has physical properties different from that of unmagnetized water due to this change in molecular structure, and, for example, the solubility changes. It is known to utilize this property to dissolve and clean the internal deposits of pipes such as water pipes. The present inventors have developed this concept and have found that a magnetic field also changes the solubility of ozone, and arrived at the present invention. That is, the present invention changes the molecular structure of the water to be treated by applying a magnetic field to the water to be treated such as tap water that dissolves the ozone-containing gas to improve the dissolution or absorption rate of ozone to obtain highly concentrated ozone water. It is possible to manufacture. The ozone absorption rate without applying a magnetic field is usually about 50 to 60%, but the concentration of ozone water produced by the present invention rises to about 90%.

Since the purpose of applying the magnetic field is to change the molecular structure of the water to be treated, even if it is carried out simultaneously with the contact between the water to be treated and the ozone-containing gas, a magnetic field is applied to the water to be treated in advance. The water to be treated having a changed structure may be brought into contact with the ozone-containing gas. In other words, when performing ozone dissolution in ozone-containing gas into the water to be treated in the dissolution tank, even if a magnetic field is applied to the water to be treated in the dissolution tank by winding an electromagnet around the dissolution tank, Water to be treated before being introduced, for example, an electromagnet is wound around a water pipe, a magnetic field is applied to the tap water in the water pipe, and a molecular structure of the water to be treated is contacted before or before contact with an ozone-containing gas. It may be changed to increase the solubility. For example, a coil is wound around a dissolving tank for dissolving ozone in swimming pool water, and while energizing so that the magnetic field is about 1000 gauss, the ozone-containing gas of about 5 wt% obtained by the discharge type ozonizer is supplied. When blown from below the dissolution tank, about 90% of ozone is absorbed in the pool water in the dissolution tank with almost no generation of waste gas.

When the strength of the magnetic field is changed during the dissolution of ozone, there is almost no effect of improving the solubility below 100 Gauss.
In the range of 0 Gauss to 2000 Gauss, ozone dissolves at a high absorption rate without decomposing. However, when it exceeds 2000 gauss, the solubility increases but the ozone water concentration decreases slightly. 5000
When it exceeds Gauss, the concentration of ozone water decreases to the same level as when the magnetic field is not applied, and when the magnetic field is further increased, the concentration of ozone water becomes lower than when the magnetic field is not applied. In this case, since the waste gas contains almost no ozone gas, it can be inferred that if the magnetic field is too strong, the dissolved ozone is decomposed into oxygen and the ozone water concentration is reduced. Therefore, when a strong magnetic field is applied, if it is applied to the water to be treated before it is introduced into the dissolution tank, ozone will not exist directly in the magnetic field, and the decomposition of ozone can be prevented. A magnetic field of 5000 gauss or more can be applied to.

The magnetic field may be applied in the same manner as usual. For example, a coil may be wound around a melting tank or a water pipe to energize it, or a permanent magnet such as a rare earth type plastic magnet may be wound around the same place. be able to. According to the method of the present invention, ozone water can be produced with high efficiency from the same amount of ozone-containing gas produced by the electrolysis method, the discharge method or the like, so that the ozonizer and the dissolution tank can be downsized.

Next, one example of the method for producing ozone water according to the present invention will be described with reference to the accompanying drawings. FIG. 1 is a flow sheet showing an example of an ozone water producing apparatus that can be used in the method of the present invention. An ozone-containing gas introducing pipe 2 is inserted into the lower wall of the cylindrical ozone dissolving tank 1, and the ozone-containing gas produced by the ozonizer 3 is introduced into the dissolving tank 1 from the introducing pipe 2, The water to be treated 4 is diffused. A coil 5 for a dissolution tank is wound around the dissolution tank 1, and a magnetic field is applied to the water to be treated 4 in the dissolution tank 1 by energizing the coil 5.

On the upper side wall of the dissolving tank 1, there is installed a treated water introducing pipe 7 around which an introducing pipe coil 6 is wound. By supplying electricity to the coil 6, the treated water is supplied to the dissolving tank 1 before being supplied. A magnetic field is applied to the treated water. 8 is a waste gas treatment tower installed above the dissolution tank 1,
Reference numeral 9 is an ozone water extraction pipe connected to the bottom plate of the dissolution tank 1.

When both or one of the coils 5 and 6 is energized, a magnetic field is applied to the water to be treated and the molecular structure is changed to improve the solubility in ozone. Therefore, ozone diffused from the ozone-containing gas introduction pipe 2 into the water 4 to be treated in the dissolution tank 1 is dissolved in the water 4 to be treated with a high absorption rate and has a much higher concentration than that in the case where no magnetic field is applied. High-concentration ozone water can be obtained from the water extraction pipe 9.

[0015]

EXAMPLES Next, examples of the method for producing ozone water of the present invention will be described, but the examples do not limit the present invention.

Example 1 14 g by weight of ozone-containing gas produced by water electrolysis 3 g-ozone / hour made of stainless steel with a height of 500 mm and an electromagnet wound to form a magnetic field of 800 Gauss
The concentration of ozone water at the outlet of the dissolution tank was measured by bringing it into a 200 mm cylindrical dissolution tank and making it diffuse, thereby bringing it into contact with tap water at a liquid temperature of 20 ° C. and a flow rate of 15 l / min. When the electromagnet was energized, the concentration of ozone water at the outlet of the dissolution tank was 3 mg / liter, and the absorption rate was 90%. On the other hand, when the electromagnet was not energized, the concentration of ozone water at the outlet of the dissolution tank was 2 mg / liter, and the absorption rate decreased to 60%.

[0016]

[Comparative Example 1] Ozone water was produced while the electromagnet was energized and the ozone water concentration was measured using the same apparatus as in Example 1 except that the electromagnet was a magnet for forming a magnetic field of 10,000 Gauss. The concentration was 1.7 mg / liter. The absorption rate was 50%.

[0017]

[Example 2] The same apparatus as in Example 1 was used except that the electromagnet was wound around a tap water introduction pipe of the dissolution tank instead of being wound around the dissolution tank, and the electromagnet was energized to pass a magnetic field of 800 gauss. Ozone water was produced by introducing the tap water of No. 3 into a dissolution tank and bringing it into contact with an ozone-containing gas. The concentration of the obtained ozone water was 3 mg / liter, which was the same as when the electromagnet was wound around the dissolution tank.

[0018]

INDUSTRIAL APPLICABILITY The present invention is a method for producing ozone water by contacting ozone-containing gas with water to be treated to dissolve ozone in the water to be treated, and applying a magnetic field of 100 to 5000 gauss to the water to be treated. However, it is a method for producing ozone water, characterized in that ozone is dissolved, and the magnetic field can be applied to the water to be treated before contact with the ozone-containing gas. When a magnetic field is applied to the water to be treated in which ozone is dissolved, the molecular structure of the water to be treated changes, and the solubility or absorption rate of ozone is improved, making it possible to produce highly concentrated ozone water. The ozone absorption rate without applying a magnetic field is usually about 50 to 60%, but the concentration of ozone water produced by the present invention is about 90%.
Rise to%.

The ozonizer is often installed at a site requiring ozone water, and it is desirable to make it compact from the viewpoint of transportation, installation and operation. Even if the capacity of both the ozonizer that produces the ozone and the dissolution tank that produces ozone water from the produced ozone is reduced, high-concentration ozone water can be produced with an efficiency equal to or higher than the conventional one. Can contribute. Further, since high-concentration ozone water can be easily produced, it is possible to meet the demand in various applications requiring high-concentration ozone water.

[Brief description of drawings]

FIG. 1 is a flow sheet showing an example of an ozone water producing apparatus that can be used in the method of the present invention.

[Explanation of symbols]

1 ... Melting tank 2 ... Ozone-containing gas introduction pipe 3.
..Ozonizer 4 ... Water to be treated 5, 6 ... Coil 7 ... Pipe for introducing treated water 8 ... Waste gas treatment tower 9 ... Ozone water extraction pipe

Claims (2)

[Claims] 1. A method for producing ozone water by contacting an ozone-containing gas with water to be treated to dissolve ozone in the water to be treated, wherein ozone is dissolved while applying a magnetic field of 100 to 5000 gauss to the water to be treated. A method for producing ozone water, characterized in that the method is performed. 2. A method for producing ozone water by contacting an ozone-containing gas with water to be treated to dissolve ozone in the water to be treated, wherein the ozone-containing gas is added to the water to be treated after passing a magnetic field of 100 gauss or more. A method for producing ozone water, which comprises contacting to dissolve ozone.