JPS62225292A - Device for decomposing dissolved ozone - Google Patents

Abstract

PURPOSE:To quickly decompose ozone dissolved in liquid to oxygen with small- sized installation by providing an ultrasonic wave generating source which generates ultrasonic waves toward the inside of a flow passage to transport the liquid such water in which the ozone is dissolved to said flow passage. CONSTITUTION:The ultrasonic wave generating source 2 which generates the ultrasonic waves toward the inside of the flow passage 1 for transporting the liquid such as water in which the ozone is dissolved is disposed to said flow passage 1. The ozone dissolved in the liquid is quickly decomposed to oxygen by using such small-sized device.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a dissolved ozone decomposition device for decomposing ozone dissolved in a liquid such as water into oxygen.

rConventional Technology It is widely known that ozone dissolved in water has a remarkable effect on sterilization, bleaching, etc. In particular, it is known that dissolved ozone decomposes into oxygen over time, and that chlorine Compared to sterilization and chlorine bleaching, this method has a major feature in that it has no residual toxicity.

However, using fluid with residual dissolved ozone for food and drink is harmful to the human body, and if raw material fluid with residual dissolved ozone is sent to the next process, the desired reaction will not occur in the next process. you won't be able to get it.

Therefore, dissolved ozone that has undergone liquid sterilization, bleaching, and other treatments must be decomposed at a desired time.

Therefore, as this type of dissolved ozone decomposition device, one using activated carbon has generally been used. In conventional dissolved ozone decomposition equipment using activated carbon, a liquid in which ozone is dissolved passes through an activated carbon-filled tank, and the activated carbon and the ozone-dissolved liquid come into contact, causing the activated carbon to act as a kind of catalyst. It decomposes dissolved ozone into oxygen.

``Problem to be Solved by the Invention J'' However, the conventional dissolved ozone decomposition equipment described above has the disadvantage of requiring a large activated carbon-filled tank corresponding to the amount of treatment, and a part of the activated carbon is chemically mixed with ozone. Since it reacts and gradually disappears, it has the disadvantage that stable processing cannot be continued without frequent maintenance and inspection.

In particular, large activated carbon tanks have limited installation locations, so it is not always possible to decompose dissolved ozone just before the point of use of the ozonated liquid (hereinafter referred to as the point of use), and the liquid passes through it. Since this method requires a certain amount of time, it has the disadvantage that microorganisms may be generated downstream (including in the ozone tank) where ozone has already been decomposed.

Therefore, the present invention was made in view of the above drawbacks, and an object of the present invention is to provide a dissolved ozone decomposition device that can decompose ozone dissolved in a liquid into oxygen in a short time using as small a facility as possible. It is something.

Means for solving the interlayer point A technical measure is taken in which an ultrasonic generation source that generates ultrasonic waves toward the inside of the flow path is arranged in the flow path.

r effect" Therefore, in the dissolved ozone decomposition apparatus of the present invention, an ultrasonic sound field is induced in the flow path by the ultrasonic generation source. The liquid flowing through this channel is irradiated with ultrasonic waves when passing through the ultrasonic sound field. Due to this ultrasonic irradiation, the liquid in the channel receives intense vibrational energy, creating numerous high-pressure areas and low-pressure areas in the liquid, causing a cavitation phenomenon, also known as cold boiling, in which microbubbles are repeatedly generated and burst. .

Ozone, especially gas phase ozone, is not a stable molecule by nature, so it decomposes into PIl elements when external energy is applied to it. The above-mentioned cavitation phenomenon causes the dissolved ozone to change its properties alternately into a gas phase and a liquid phase, and at this time, the ozone is decomposed efficiently in a short period of time due to the exchange of energy such as thermal energy. It is something that

Embodiment J Next, an embodiment of the present invention will be described below with reference to FIGS. 1 to 6.

Figure 1 shows the dissolved ozone decomposition device of the present invention! This is an example in which O was used in the water sterilization process. In the figure, 3 is an ozone generator and 4 is an ozone sterilization tank.

A raw water supply pipe 5 is connected to the ozone sterilization tank 4 described in F. This raw water supply pipe 5 is equipped with a solenoid valve that is opened and closed by a water level gauge. Raw water is always retained.

Further, an aeration plate 9 is housed at the bottom of the ozone sterilization tank 4, and an ozone discharge pipe 8 of an ozone generator JII 3 is connected to the aeration plate 9, and ozone is supplied in the form of microbubbles into the raw water. There is no such thing. Pure ozone may be used as the ozone supplied to the ozone sterilization tank 4, but when the ozone generator 3 of this embodiment is used, air may be used as the raw material gas for the ozone generator 3. In this case, ozone-containing air is actually used, and when oxygen is used as the raw material gas, ozone-containing oxygen is actually used. Then, the ozone supplied into the raw material water from the aeration plate 9 is dissolved and absorbed into the raw material water, or the gas containing oxygen or ozone that is not absorbed is recovered and dehumidified, and the raw material of the ozone generator 3 is again used. Although it is used as a gas, its flow is not shown.

Further, the ozone sterilization tank 4 is provided with an outflow lower a,
The water sterilized by ozone in the ozone sterilization tank 4 is led from the outflow lower a to a place where the sterile water is used (hereinafter referred to as a use point) through a flow path 1 via a filter 6.

The dissolved ozone decomposition device 10 of the present invention is disposed immediately before the use point on the downstream side of the flow path 1.
An ultrasonic generation source 2 that generates ultrasonic waves toward the inside of the flow path is arranged around the periphery of the flow path. Although it is not necessarily shown clearly in the figure, the sensor of the ultrasonic wave generation source 2 is exposed to the inner surface of the flow path l.

The ultrasonic wave generation source 2 may be placed one on one side of the flow path 1 (q), or a plurality of ultrasonic wave sources 2 may be placed opposite each other as shown in FIG. Of course, a plurality of them may be provided in the flow direction.

When a plurality of ultrasonic generation sources 2, 2, 2, etc. mentioned above are installed in one place, the imager surface of each ultrasonic generation source 2 is connected to the flow path 1.
The distance between the transducer of each ultrasonic generation source 2 and the center of the flow path 1 is determined by each ultrasonic generation source 2. When the position of the generated ultrasonic wave (the point with the highest wave peak value of the ultrasonic wave) is set to be located at the center of the flow path 1, each ultrasonic wave generating FA
2.2.2... each ultrasonic wave overlaps with another, resulting in a larger cavity phenomenon. On the other hand, the positional relationship of the ultrasonic sources 2, 2, 2... is such that the antinode of the ultrasonic wave in one direction overlaps the node of the ultrasonic wave in the other direction (the part where the peak value of the ultrasonic wave is low). The expected cavitation phenomenon cannot be obtained because the ultrasonic waves cancel each other out. Therefore, the focus of rMi sound waves is adjusted to obtain the largest cavitation phenomenon at the desired position by adjusting the ultrasonic generation direction and positional relationship of multiple ultrasonic generation sources 2.2.2... π, and it is most efficient to locate this focal point at the center of the flow path 1.

FIGS. 3 to 6 show an embodiment in which a plurality of ultrasonic generation sources 2, which are larger than those in FIGS. 1 and 2, are disposed opposite each other at one location in the flow path 1. In the example shown in FIG. 2, if it is assumed that the ultrasonic waves travel straight through the flow path 1, there will be a portion of the cross section of the flow path 1 where the ultrasonic waves are not irradiated. To solve this problem, each ultrasonic generation source 2 should be made smaller and arranged as many as possible on the circumferential surface of the flow path 1, but if the flow path 1 is a thin tube, the ultrasonic generation sources 2 should be made smaller and more It is not economical to arrange the pedestal around the periphery of the pedestal, and as the pedestal becomes smaller, the output of each ultrasonic generation source 2 is limited, resulting in a decrease in efficiency.

Therefore, the embodiments shown in Figure 3 and later are based on the flow path! A plurality of ultrasonic generation sources 2, which are larger than the diameter of Fill with water that has been thoroughly deaerated.

The large diameter container 20 is formed to have a regular polygonal or circular cross section,
An ultrasonic generation source 2 is disposed on each surface (in the case of a circular cross section, the radiation position on the circumferential surface), and each ultrasonic generation source 2 is connected to the large diameter container 2.
The focus is on the channel 1 passing through the center of the channel.

"Effect of the invention 1 The dissolved ozone decomposition apparatus of the present invention is as described above. One side of the large-diameter container 20 with a square cross section as shown in FIG. On each side of the large-diameter container 20, there is a
Ultrasonic source 2 with 8 Hz Langevin type prefecture
When water containing 2 ppm of ozone was passed through the flow path 1 at a rate of 1500 cc/min, the ozone concentration on the inflow side was 2ρρm, while the ozone concentration on the outflow side was 0. .6ppm, about 1/3 reduction, and furthermore,
When the above two groups of ultrasonic generators are arranged in three stages along the flow path 1, the ozone concentration on the outflow side that has passed through the final stage is a low concentration below the normal detection limit (0.01 ppm), and there is sufficient ozone. A decomposition effect was obtained.

In order to obtain the above effect in an example using a conventional activated carbon tank, it is necessary to prepare an activated carbon tank with a capacity that allows the ozone-dissolving liquid to come into contact with the activated carbon for about 20 minutes, and the installation location is naturally limited. However, the dissolved ozone decomposition device of the present invention has a simple and compact configuration that only includes the ultrasonic generation source 2 in the flow path 1, and as mentioned above, can process a large amount in a short time and saves space for installation. Can be set arbitrarily. Therefore, in the process shown in the embodiment shown in FIG. 1, the dissolved ozone decomposition device of the present invention can be placed m in front of the point of use, and as a result, ozone sterilization can also be performed in the flow path 1 downstream of the ozone sterilization tank 4. Therefore, it is possible to provide a device for decomposing dissolved ozone that can maintain its properties.

In addition, with the conventional activated carbon tank method, it was difficult to perform stable treatment over time due to consumption of activated carbon, clogging, and occurrence of channeling phenomenon in the activated carbon tank, but the dissolved ozone decomposition device of the present invention Since there is no need to change the diameter of the flow path 1 during ozone decomposition and there is no fear of channeling, stable ozone decomposition performance can always be achieved.

[Brief explanation of drawings]

Fig. 1 is a front view of an embodiment in which the dissolved ozone decomposition device of the present invention is conveniently used in a water sterilization process, Fig. 2 is an enlarged sectional view taken along line A-A, and Figs. 3 to 6 are different embodiments. It shows a cross-sectional view of main parts. 1~Flow path 2~Mi sound wave generation source 20~Large diameter container 1-2 fB p 3 m

Claims (1)

[Claims] A device for decomposing dissolved ozone, which includes an ultrasonic generation source that generates ultrasonic waves directed toward the inside of the flow path, in a flow path through which a liquid such as water containing dissolved ozone flows.