JPH03293086A - Method for obtaining water rich in dissolved oxygen, method and apparatus for reducing ozone in water - Google Patents

Abstract

PURPOSE:To efficiently dissolve oxygen or ozone in water by placing an intake for sucking treated water from a treating vessel apart from the nozzle of an ozone blowing unit at the lower part of the treating vessel. CONSTITUTION:A water treating apparatus is composed essentially of a treating vessel 10, an ozone blowing unit 2, 3 for blowing ozone for sterilization into water to be treated in the vessel 10 and a UV irradiation device 1 for further sterilizing ozone-contg. water and decomposing the ozone into oxygen. An intake 4 for sucking treated water from the treating vessel 10 is placed apart from the nozzle of the ozone blowing unit 2, 3 at the lower part of the vessel 10.

Description

[Detailed Description of the Invention] [Industrial Application Field] A device that can increase the dissolved oxygen concentration of water supplied to living organisms and supply a large amount of water in fish farms, hydroponic cultivation, etc.
The present invention aims to increase the growth rate of living organisms and at the same time provide an effective means for water treatment such as water sterilization, decolorization, deozonation, flavoring, and deodorization.

[Conventional technology]

Conventionally, in order to dissolve oxygen or ozone into water, an ejector or a diffuser pipe or the like was simply used to blow it into the water.

[Problem to be solved by the invention]

Oxygen or ozone, which is difficult to dissolve in water, can be dissolved in water with much higher efficiency than before.

[Means to solve the problem]

The container into which water and ozone are injected is irradiated with ultraviolet light.
This method utilizes the phenomenon in which ozone is decomposed by ultraviolet rays and turned into oxygen.Rather than injecting oxygen directly, the purpose is to inject ozone and generate oxygen through ultraviolet decomposition.The generated oxygen is used as oxygen in the generator, so-called activation. becomes oxygen.

[For production]

Fill a container (10) as shown in Figure 6 with water (12) from the inlet (8), and attach an ozone injection tube (3) with a diffuser tube (2) at the tip and an ultraviolet lamp (1). Insert the aeration cylinder (
2) Disperse and eject ozone into the water.

Figure 1 shows the time course of measuring the ozone concentration in water by spouting only ozone without turning on the ultraviolet lamp (1). The second part shows the time course of ozone concentration in water when
It is a diagram.

Comparing Figures 1 and 2, it can be seen that in the absence of ultraviolet light, the water ozone concentration is 20 times higher than in the case of ultraviolet light, and reaches saturation.

In Figure 1, after ozone injection, the ozone concentration in water is CP
”), but if ozone injection is stopped at this point, as shown in the curve (S), ozone naturally decomposes and turns into oxygen, and the ozone concentration gradually decreases. start.

However, when the ultraviolet lamp is turned on at point P), the ozone concentration rapidly decreases as shown by the curve (M) and decomposes into oxygen. That is, the half-life of ozone concentration in water was about 20 minutes in pure water, but it was about 20 seconds under ultraviolet irradiation.
A significant shortening was observed.

Ozone is relatively difficult to dissolve in water, but as shown in Figure 1, the concentration in water increases relatively quickly until it reaches about QJppm, and then slowly approaches the saturated state.

As shown in Figure 1, it generally takes time to increase the ozone concentration, but if the ozone in the water is decomposed and converted to oxygen by ultraviolet irradiation, the ozone concentration in the water will be low, that is, the ozone concentration will be low. While the dissolution rate at point (X) in Figure 1 remains high, ozone is converted to oxygen, and the solubility of ozone is greater than the solubility of oxygen. High water can be converted quickly.

Figure 2 shows the results of this experiment, in which ozone with a higher concentration than in Figure 1 was ejected into the water, and the ozone was successively decomposed by ultraviolet rays and converted into oxygen.

That is, while the ozone concentration in water remains at a value far lower than the saturation value of 0.3 ppm, it is converted into a large amount of oxygen.

In this case as well, if the ozone supply is stopped at point (Q) and natural decomposition occurs, the concentration will start to gradually decrease as in part (R), but under ultraviolet irradiation, the concentration will drop rapidly as in part (N). do.

The present invention attempts to easily supply a large amount of water with a large amount of dissolved oxygen by utilizing such a phenomenon as a device.

Because ozone has a strong chemical reaction and oxidizing effect, water with high ozone concentration kills young fish and damages plants. In particular, the action of free gaseous ozone is intense, so it is necessary to remove the bubbles that are generated when ozone is blown into water to the extent that they are not harmful to living things.

Ultraviolet light with a wavelength of 253.7 nm (nanometers) decomposes ozone and turns it into oxygen, but it also has a strong sterilizing effect and has the power to kill bacteria and viruses in water in seconds. Sufficient data has been shown regarding the relationship between removal rates.

The present invention is configured such that an ozone injection mechanism and an ultraviolet lamp are housed in a container, water is injected from the top of the container, and water is taken out from the bottom of the container, and a stirring mechanism and a bubble separation mechanism are provided as necessary. , the injected ozone is continuously and rapidly decomposed and converted into oxygen to maintain the ozone concentration in the water taken out at a desired low value. Ultraviolet light may be irradiated from outside the container.

[Function] The flow rate of the water itself flowing into the container causes the internal water to be stirred by the forced stirring mechanism, and the ozone or ozone-containing bubbles released from the aeration tube into this water are rapidly exposed to ultraviolet light. It continues to decompose into oxygen.

Relatively large bubbles rise against the downward flow within the container and are released from the top of the container, but for example, bubbles that are larger than microscopic bubbles that can be barely discerned with the naked eye and that are harmful to fry, etc. The water that is all raised and removed and taken out from the bottom of the container contains a large amount of dissolved oxygen, does not contain air bubbles, is sterilized water, and the ozone concentration can be controlled to be extremely low.

〔Effect of the invention〕

The present invention can supply water with a high dissolved oxygen concentration easily, quickly, and in large quantities, thereby increasing the growth rate of organisms in aquaculture, hydroponics, etc. It is effective as a device for obtaining sterile water by killing viruses, bacteria, etc. In addition, the ozone concentration in water can be rapidly lowered, and water containing no ozone or extremely diluted ozone can be obtained.

〔Example〕

Examples thereof are shown in FIG. 3, FIG. 4, FIG. 5, and FIG. 6.

A gas dispersion injection mechanism consisting of an ozone injection pipe (3), an aeration tube (2), etc., and an ultraviolet lamp (1) are housed in the container (10), and a water injection port (8) is provided at the upper end of the container (10). will be established. A lower outlet (4) connected to the outlet (9) is provided near the bottom of the container (10). The lower discharge port (4) may be directly connected to the discharge port (9) as shown in FIG. 5, or it may be connected directly to the discharge port (9) as shown in FIGS. It may be connected to the outlet (9). When the container (10) is of a closed type, an air bend (7) may be provided at the top end of the container (10) so that only gas can be discharged. Lower outlet (
4) is provided in a place where air bubbles (11) cannot enter. The aeration pipe (2) may be located at the bottom of the container, or may be located near the center, or may be provided in the pipeline before entering the inlet (8). In any case, the structure is such that water containing ozone in the form of bubbles or dissolved in water flows around the ultraviolet lamp (1).

Although an upward flow of water may be used as long as sufficient ultraviolet intensity and exposure time to the ultraviolet rays can be obtained, a downward flow is generally more advantageous in terms of bubble separation.

Water flowing in through the inlet (8) slowly moves down around the UV lamp (1) and is exposed to UV radiation. Diffusion cylinder (
The ozone bubbles (11) released from 2) dissolve in the water, and large bubbles that are not completely dissolved rise against the downward flow and reach the open opening at the top of the container (10) or the air bend (7).
released from.

Ozone dissolved in water becomes oxygen in a very short time when exposed to ultraviolet light. The water (12) is exposed to ultraviolet rays while descending, and pathogenic bacteria and viruses in the water are killed, and the substances that make up the depth, color, etc. are also oxidized and decomposed.

The water that has reached the lower discharge port contains almost no bubbles, contains a large amount of dissolved oxygen, and is sterilized.

The oxygen generated by the conversion of ozone exposed to ultraviolet light in water is highly active generator oxygen and has a strong oxidizing effect.

The time that ozone exists as ozone is extremely short, and the ozone concentration in water can also be reduced to an extremely low value or zero.

[Brief explanation of the drawing]

Figure 1' shows the experimental results showing the solubility characteristics of ozone in water with and without UV irradiation. Figure 2 shows the experimental results showing the solubility characteristics of ozone in water with UV irradiation. , and illustrates a state in which ozone is rapidly decomposed by ultraviolet rays at the same time as ozone injection is stopped for the above two examples. Figures 3, 4, 5, and 6 all show embodiments of the present invention, including a water inlet (8), a container (10), an ozone injection pipe (3), and an aeration tube ( 2), ultraviolet lamp (1),
The lower discharge port (4) and the discharge port (9) are illustrated.

Claims (1)

[Claims] 1. A method for reducing ozone in water, which comprises irradiating water in which ozone is dissolved with ultraviolet rays with a wavelength of about 253.7 nm (nanometers) to reduce the ozone concentration in water; Device. 2. A method and device for reducing ozone in water, which comprises dissolving ozone in water and irradiating ultraviolet light with a wavelength of approximately 253.7 nm to reduce the ozone concentration in water. 3. It is characterized by irradiating ultraviolet rays with a wavelength of approximately 253.7 nm to water in which ozone has been dissolved to obtain water with a high amount of dissolved oxygen.
A method and apparatus for obtaining water with a high dissolved oxygen content. 4. A method and apparatus for obtaining water rich in dissolved oxygen, which comprises dissolving ozone in water and irradiating the same with ultraviolet rays having a wavelength of about 253.7 nm to obtain water rich in dissolved oxygen. 5. In claims 1 to 4, the wavelength range of ultraviolet rays is 200 to 300 nm. A method for obtaining water with a high dissolved oxygen content, and a method and apparatus for reducing ozone in water. 6. In the flow path where ozone in water flows out, this flow path is
A method and device for reducing ozone in water, which is equipped with a mechanism for irradiating ultraviolet rays in an amount sufficient to prevent ozone from passing through in the ozone state. 7. A water inlet is provided at the upper end of the container that houses the ultraviolet lamp and the ozone supply mechanism, and a discharge port is provided near the bottom of the container to take out water from a position outside the range where ozone bubbles exist. A method for obtaining water with a large amount of dissolved oxygen, and a method and apparatus for reducing ozone in water, as set forth in claims 1 to 5. 8. A method for obtaining water with a large amount of dissolved oxygen according to claims 1 to 6, which has a mechanism for irradiating ultraviolet rays from the outside of the container to the water in which ozone is dissolved inside the container. , a method and apparatus for reducing ozone in water. 9. A method for obtaining water with a high dissolved oxygen content, in which a mechanism is installed in the channel through which ozone in the water flows out, to irradiate the channel with sufficient amount of ultraviolet rays to bring the ozone into a state where the ozone is substantially converted to oxygen. and equipment. 10. A method for obtaining water with a large amount of dissolved oxygen, and reducing ozone in water, as set forth in claims 1 to 6, wherein the position where ozone is dissolved in water is irradiated with ultraviolet rays. method and apparatus for