JPH0239957B2 - - Google Patents

Description

[Detailed description of the invention]

INDUSTRIAL APPLICATION FIELD The present invention relates to a method of enriching dissolved oxygen in water by aerating air into water, and more particularly to a method of enriching dissolved oxygen in water by magnetizing and activating the air aerated into water. BACKGROUND ART Generally, when water is left undisturbed, the amount of dissolved oxygen in the water decreases, which causes the water to rot and aquatic organisms to die. In order to prevent such rotting and death, it is necessary to enrich dissolved oxygen in water, and various methods have been used to enrich dissolved oxygen in water. Typical methods for increasing the amount of dissolved oxygen in the water include a method of aerating air into the water, such as a method of introducing an air hose into the water and supplying air to bring a large number of bubbles into contact with the water, and an aeration machine. A method of stirring the water surface or water with a stirrer is known. However, the enrichment of dissolved oxygen by such aeration method is limited both in quantity and time, and it is not possible to increase the solubility beyond the saturated solubility, and furthermore, it is difficult to maintain the enriched dissolved oxygen state for a long time. It is. On the other hand, it has been conventionally known that by utilizing a magnetic field as a water purification method, it is possible to prevent scale formation and adhesion, and to sterilize water. By applying water treatment methods using such magnetic fields, it is possible to excite oxygen and enrich dissolved oxygen in water, but the effect depends on the strength of the magnetic field (intensity of magnetic flux density). It is usually difficult to generate a magnetic field strength sufficient to enrich dissolved oxygen in water. That is, in the above method, the water to be treated is usually passed through a suitable pipe, and a magnet is installed outside the pipe to generate a magnetic field, without direct contact between the water and the magnet. In this method, the distance between the magnetic poles is inevitably greater than the outer diameter of the pipe, making it difficult to obtain sufficient magnetic field strength. In particular, when the diameter of the pipe is large, the above method cannot be adopted. It is also conceivable to cover the surface of the magnet with some kind of means and place it in water; however, such a method would complicate the arrangement within the tube and would be impractical. Moreover, in any case where any of the above-mentioned means is adopted, the enriched dissolved oxygen in water has poor stability and cannot maintain this enriched state for a long time only by using a magnetic field. Problems to be Solved by the Invention The present inventors have solved the drawbacks of the above-mentioned prior art,
We have conducted extensive research with the aim of providing a new method for enriching dissolved oxygen in water that can more easily and efficiently increase the amount of dissolved oxygen in water and maintain the improved dissolved oxygen state for a long period of time. . As a result, it was discovered that when the air to be aerated into water is brought into contact with a mineral having a specific natural residual magnetization to activate magnetization, a method for enriching dissolved oxygen in water that meets the above objective can be provided, and the present invention is hereby made. I was able to complete it. Means for Solving the Problems The present invention provides that when air is aerated into water to enrich dissolved oxygen in water, the air to be aerated into water is
The present invention relates to a method for enriching dissolved oxygen in water, which comprises bringing the air into contact with a mineral having natural residual magnetization to activate its magnetization, or simultaneously applying a magnetic field to the air to excite oxygen in the air. According to the method of the present invention, the amount of dissolved oxygen in water can be rapidly and significantly increased simply and efficiently, and the improved dissolved oxygen state can be maintained for a long period of time. The reason why the method of the present invention achieves such excellent effects is still not clear, but the minerals with natural residual magnetization used in the present invention have an inherent magnetizing effect, and this When brought into contact with the mineral, the air or the oxygen in it is magnetized and activated by the electromagnetic waves generated non-directionally by the mineral.
It is also believed that this is because when a magnetic field is applied to the air, oxygen is excited and the magnetization activation due to contact with the mineral becomes even more significant. In other words, oxygen is a paramagnetic substance and is easily excited. When oxygen is brought into contact with a specific mineral as described above and a magnetic field is applied, the orbits of the valence electrons of oxygen molecules tend to approach each other, causing the energy level to change. increases and becomes an excited state, exhibiting an active oxygen state. Of course, the energy at this time is not as strong as ultraviolet rays or corona discharge, so ozone generation due to the dissociation of oxygen molecules does not occur, but ionization is thought to proceed.
This increases the affinity of the oxygen for water molecules, causing molecular association, thus rapidly increasing the dissolved oxygen in the water, and it is thought that this improved dissolved oxygen state is stabilized by the magnetization of the mineral. . In any case, there has been no example of the use of minerals with natural residual magnetization or the combination of such minerals and magnetic field action to enrich and stabilize dissolved oxygen in water, and of course, such use or combination has never been done. There is also no knowledge that enrichment and stabilization of dissolved oxygen in water, which is the objective of the present invention, can be achieved. In the method of the present invention, it is essential to bring the air aerated into the water into contact with minerals having natural residual magnetization to activate magnetization. As the mineral having natural residual magnetization, various minerals having a natural residual magnetization of 10 ^-4 to ^{10 -13} T (commonly used Sl magnetization strength, hereinafter the same) can be used. Typical examples include clays and ores having natural residual magnetization within the above range. This clay is
Usually, its constituent minerals are quartz, feldspar, chlorite, amphibole, and mica, and it is a reddish-brown substance whose main components are SiO ₂ and Al ₂ O _3. In the present invention, it is used in the form of a powder with a particle size of about 2 μm or less. preferable. In addition, the above-mentioned ores refer to so-called hornels, which are made of granite, quartz porphyry, andesite, rhyolite, etc., and sedimentary rocks around them, such as mudstone and sandstone, which have become hard due to thermal metamorphism. , SiO ₂ and Al ₂ O ₃ as main components, and is usually used after being crushed to an appropriate size, and it is particularly advantageous to use it in the form of a powder with a particle size of 5 μm or less. Specific examples of minerals having natural residual magnetization include viscosity and ores produced near Kitagata-cho, Higashiusuki-gun, Miyazaki Prefecture, and Hinokage-cho, Nishiusuki-gun, Miyazaki Prefecture. The characteristics and analysis values are as shown in Table 1 below.

[Table] In addition to the above-mentioned components, the minerals (clays and ores) exemplified above also contain trace metals such as titanium, manganese, copper, lead, antimony, barium, zirconium, rubidium, and strontium. In addition, in the present invention, the mineral having natural residual magnetization can be used in the powder form as described above, or in the form of a sintered body processed into an arbitrary shape by appropriately firing, etc. The above-mentioned specific natural residual magnetization strength is not impaired even when the magnetic field is turned on, and therefore, the desired effect of the present invention based on this can be achieved. According to a preferred embodiment of the method of the present invention, the above-mentioned mineral having natural residual magnetization is filled in a suitable container and placed in a piping route for air to be aerated into the water, and the mineral having natural residual magnetization is It is brought into contact with and put into practical use. In this case, considering the ease of filling the mineral into a container, it is preferable that the mineral be in the form of, for example, spherical ceramic, and such a form has the advantage that it can exhibit a better magnetization activation effect than a powder form. Furthermore, in consideration of passing the air to be treated through the container, it is desirable to fill the container in an appropriately sparse state in view of fluidity of the air, pressure loss, etc. Usually, the filling rate (volume ratio) is preferably about 5 to 30%. The contact conditions between the mineral and air are not particularly limited, but usually air is introduced at a rate of about 0.5 m/sec or more into a container filled with a mineral with natural residual magnetization installed in the piping route. , preferably about 0.5
It is preferable to allow the passage to pass at a speed of ~5.0 m/sec. According to another embodiment of the present invention, the above-mentioned mineral having natural residual magnetization is used to create the above-mentioned containers, air pipes, etc. by coating the powder on a suitable base material according to a conventional method and firing the powder. However, these can also be used as piping for air to be aerated into water, and furthermore, they can be placed by immersion in a water tank for aerating air. The conditions for carrying out the method of the present invention according to this embodiment can also be the same as those described above. Furthermore, in the method of the present invention, a means for applying a magnetic field can be used in combination with the above-mentioned means for contacting with minerals having natural residual magnetization, thereby achieving even better enrichment and stabilization of dissolved oxygen in water. Can be done. This magnetic field action can be carried out using permanent magnets or by using electromagnets. According to a preferred embodiment of the present invention that employs means for applying such a magnetic field, the above-mentioned permanent magnet or electromagnet is installed outside a pipe for air that is aerated into water, and a magnetic field is applied to the air flowing inside the pipe. to excite the air. The shape and dimensions of the magnet used here are not limited in any way, and may be any shape such as a medium plate shape, donut shape, rectangular parallelepiped shape, etc., but the residual magnetic flux density is about 800 Gauss or more, preferably about 1000 Gauss or more. ~
It is preferable to have a magnetic field strength in the range of 4000 Gauss. If the residual magnetic flux density is less than about 800 Gauss, there is almost no effect of its use, and if it exceeds about 4000 Gauss, it will have a suppressive effect on aquatic organisms such as microorganisms, and the use of treated water will be limited. Both of these are undesirable. The water to be treated that is preferable for carrying out the method of the present invention is not particularly limited, and may be any type of water for household use, industry, fish farming, etc., such as ordinary tap water or underground water.
The present invention can be easily carried out under conditions where the water and air are about 6 to 45°C, and the desired effects can be achieved. Hereinafter, one preferred embodiment of the method of the present invention will be described using the accompanying drawings. FIG. 1 shows a schematic cross-sectional view of one particularly preferred apparatus for carrying out the method of the present invention.
The method of the present invention using the apparatus shown in the figure connects an air compressor 1 and a water tank 2 with a connecting pipe 3 made of, for example, hard vinyl chloride, and connects an air compressor 1 and a water tank 2 with a connecting pipe 3 made of, for example, hard vinyl chloride. Magnetized air can be ejected into the water to aerate it and enrich dissolved oxygen in the water. As the air compressor 1, for example, OGA-15 manufactured by Hagiwara Seisakusho Co., Ltd. (air volume 17/m) can be used, and as the water tank 2, 60 x 30 x height 30 cm (50 cm) can be used.
), and as the connecting pipe 3, one with an inner diameter of 13 mm is used, but it is not particularly limited to these. The magnetization of the air flowing through the connecting pipe 3
This is accomplished by an air ventilation pipe 5 connected to a magnet and fixed with a magnet for generating a magnetic field, and a container 6 filled with minerals having natural residual magnetization. A specific example of the air ventilation pipe 5 is shown in FIGS. 2 and 3,
A specific example of the container 6 is shown in FIG. Also,
The amount of air flowing through the connecting pipe 3 can be adjusted by
This is done by Kotoku 7 and Kotoku 8 installed at Further, the amount of dissolved oxygen in the water tank 2 is measured using a sensor 9 installed in the water tank 2 and a dissolved oxygen measuring device 10 connected thereto.
In the example described later, the following four points (P1 to P4) shown in FIG. 1 are selected as the measurement points. P1...Central part of the long side wall 35mm from the bottom of the aquarium and 100mm from the short right wall P2...Central part of the long side wall 35mm from the bottom of the tank and 100mm from the short left wall P3...200mm from the bottom of the tank and 100mm from the short left wall Long side wall central part P4...Long side wall central part 200 mm from the bottom of the aquarium and 100 mm away from the right short side wall The air ventilation pipe 5 shown in Fig. 2 (perspective view) and Fig. 3 (center sectional view) will be described in detail. This is a tube (tube diameter: 0.5 mm) made of two permanent magnets (rectangular parallelepiped) 5a.
5b, the magnets are arranged at a spacing of 3 to 5 mm, but the magnets do not have to be permanent magnets and may be electromagnets, and their shape is not limited to a rectangular parallelepiped. The material of the tube 5b to which the magnet is fixed may be any material such as metal, synthetic resin, ceramics, etc., and its cross-sectional shape is a flat rectangle as shown in the figure. Although it is preferable because it can make the magnetization strength uniform, it may have any other shape, such as a circle, an ellipse, a triangle, a square, or a polygon. The wall thickness of the air ventilation pipe is preferably as thin as possible in order to reduce pipe resistance. In addition, in order to obtain a magnetization effect, we placed a
It has been empirically found that by narrowing the tubes at intervals of cm or more, the molecular association of air and oxygen is not disturbed and good crystals can be obtained. In detail, the mineral filling container 6 shown in FIG. 4 is connected to a hard vinyl chloride connecting pipe 3 using a flange 6a, and the container 6 is made of metal, synthetic resin, ceramics, etc. It can be any of the following. The container is also filled with a mineral 6b having natural residual magnetization in the form of granular ceramic. The mineral is as described above, and its shape, size, filling amount, etc. will be described in detail in Examples below. In addition, a wire mesh 6c is placed on the portion of the mineral 6b in contact with the flange 6a to prevent the mineral from flowing out.
is installed. A wire mesh can also be interposed in the container 6 parallel to the air flow to make the mineral filling loose. Thus, according to the method of the present invention, the amount of dissolved oxygen in water can be rapidly increased easily and efficiently, and the improved dissolved oxygen state can be maintained for a long period of time. Furthermore, the device that can be used in the present invention can have a very simple structure in which the air ventilation pipe 5 using the magnet and the mineral filling container 6 are installed at any position on the piping route. It magnetizes and activates the air passing through the piping, and can significantly improve the dissolved oxygen concentration in water, and the water treated in this way is particularly suitable for supplying oxygen to aquatic organisms. Furthermore, the method of the present invention does not require any energy other than the above, and the processing time is short, so its use is effective from an energy saving perspective. Examples Examples will be given below to explain the present invention in more detail. Example 1 Using the apparatus shown in FIG. 1 (details are shown below), air was flowed from the air compressor 1 into the connecting pipe 3 under the following conditions, and the air was passed through the air ventilation pipe 5 and the mineral filling container 6. to magnetize it and aerate it into the water in tank 2,
We enrich dissolved oxygen in water and measure it using a dissolved oxygen measuring device (manufactured by Central Kagaku Co., Ltd., UC-11).
It was carried out using a mold). Note that the above measurements were carried out in such a way that the bubbles released from the water sprinkler tube did not directly hit the sensor 9. In addition, the water temperature can be adjusted using an α-auto heater (150W) manufactured by Nippon Suisan Kogyo Co., Ltd.
The wind speed and air volume of the supplied air were adjusted using Kotoku 7 and Kotoku 8, and measured using a pitot tube and an airflow meter. <Equipment used> Air ventilation pipe 5 Two anisotropic ferrite magnets (both manufactured by TDK Corporation) having the four types of residual magnetic flux densities shown in Table 2 below were placed parallel to each other in the longitudinal direction with a magnet spacing of 3 mm. It was used by sandwiching the top and bottom with opposite polarity surfaces.

[Table] Mineral Filling Container 6 500 g of crushed minerals (average particle size 5 mm) having natural residual magnetization shown in Table 1 above were packed at a filling rate of 30%.
It was filled and used. <Implementation Conditions> The same test was repeated at ventilation speeds of 0.5, 1.0, 1.5, 2.0, and 5.0 m/sec. Air temperature and water temperature: Both were 17°C. <Results> Table 3 below shows the results of measuring the amount of dissolved oxygen in the water (mgO/: average value of the measured values at 4 points P1 to P4) 5 minutes after the start of the above test (start of air supply). . Table 3 also shows the air vent pipe 5 in the above.
The results obtained according to the embodiment of the present invention in the case where the air was magnetized and activated using only the mineral-filled container 6 without using the mineral-filled container 6 are also described. Furthermore, Table 3 shows a case where only aeration into water was performed without using the air vent pipe 5 and mineral filling container 6 as a control, and a case where a magnet was used without using the mineral filling container 6 for comparison. The results obtained when using only the same method are also shown.

【table】

[Table] From Table 3 above, the following follows. (1) The shape and dimensions of the magnet do not affect the increase in the amount of dissolved oxygen. (2) Aeration alone will not exceed the saturated dissolved oxygen content at that water temperature. (3) According to the implementation of the method of the present invention using minerals with natural residual magnetization, compared to only aeration, the
An increase in dissolved oxygen content of ~18% is observed. (4) Utilization of minerals with natural residual magnetization and 800~
By implementing the method of the present invention in combination with the use of a magnet having a residual magnetic flux density of 4000 Gauss, an increase in the amount of dissolved oxygen of more than 20% is observed compared to aeration alone. (5) Even when a magnet is used alone, an increase in the amount of dissolved oxygen may be observed compared to aeration alone, but the degree of increase is approximately 8% even in the maximum case using a magnet with a residual magnetic flux density of 4000 Gauss. That's about it. (6) When the supplied air velocity is 0.5 m/sec or more, a sufficient increase in the amount of dissolved oxygen is observed by the method of the present invention. Example 2 The method of the present invention was carried out in the same manner as in Example 1 using a combination of the following apparatus and conditions. <Equipment used> Air ventilation pipe 5 Anisotropic ferrite magnet with a residual magnetic flux density of 4000 Gauss (cuboid shape, 45 mm x 20 mm x 8 mm diameter,
(manufactured by TDK Corporation), with a magnet spacing of 4 mm.
It was used by sandwiching the upper and lower sides with opposite polarity surfaces parallel to the longitudinal direction. Mineral Filling Container 6 500 g of fired minerals (5 mm diameter spherical bodies) having the natural residual magnetization shown in Table 1 above were filled at a filling rate of 30%.
It was filled and used. <Implementation conditions> Ventilation speed: 1.5 m/sec Air temperature: 20°C (indoor temperature control) Water temperature: 20°C Air supply rate: 15/min <Results> According to the above test, dissolved oxygen in water increased over time from the start of air supply. The amount (mgO/) was measured. In addition, the air supply was stopped 13 minutes after the start of air supply, and the water in the aquarium was then allowed to stand still.The amount of dissolved oxygen in this still water was measured over time in the same manner, and the stability of the amount of dissolved oxygen was determined. I looked into it. The results are shown as curve 1 in FIG. In this figure, the horizontal axis shows the time (minutes) after the start of air supply, and the vertical axis shows the amount of dissolved oxygen (mg/). FIG. 5 shows the result according to the embodiment of the present invention in which the air ventilation pipe 5 was not used in the above and only the mineral-filled container 6 was used [shown as curve 2], and the result in which only the magnet was used without using the mineral-filled container 6. The results of a comparative example [shown as curve 3], and the results of a control example in which only aeration into the water was performed without using either the air vent pipe 5 or the mineral filling container 6 [shown as curve 4] Also listed. From FIG. 5 above, according to the implementation of the method of the present invention,
As shown in curves 1 and 2, in a very short time,
Dissolved oxygen in the water is activated, and a dissolved oxygen concentration in the water that significantly exceeds the saturated dissolved oxygen concentration at the water temperature is obtained, and this improved dissolved oxygen concentration in the water remains for a very long time even after the aeration is stopped. It is clear that the activation is sustained and the stability of the activation is high. This effect is particularly noticeable when the air vent pipe 5 and the mineral filling container 6 are used in combination. On the other hand, if only magnets are used, curve 3
As shown in Figure 1, the activation of dissolved oxygen in water and the effect of improving the dissolved oxygen concentration in water are not only insufficient, but also that the concentration decreases relatively quickly after the aeration is stopped, and its stability is poor. It can be seen that the properties are also difficult to improve compared to the present invention. Example 3 The method of the present invention was carried out in the same manner as in Example 1 using a combination of the following apparatus and conditions. <Equipment used> Air ventilation pipe 5 Anisotropic ferrite magnet with a residual magnetic flux density of 4000 Gauss (cuboid shape, 45 mm x 20 mm x 8 mm diameter,
(manufactured by TDK Corporation), with a magnet spacing of 4 mm.
It was used by sandwiching the upper and lower sides with opposite polarity surfaces parallel to the longitudinal direction. Mineral Filling Container 6 500 g of fired minerals (spherical bodies with a diameter of 10 mm) having the natural residual magnetization shown in Table 1 above are filled at a filling rate of 30%.
It was filled and used. <Implementation conditions> Ventilation speed: 1.5 m/sec Air temperature: 20°C (indoor temperature control) Water temperature: 6 to 50°C Air supply rate: 15/min <Results> According to the above test, 5 minutes after the start of air supply, Dissolved oxygen (mgO/) in water at a predetermined water temperature was measured, and the percentage (%) of the average value divided by the saturated dissolved oxygen concentration at the water temperature was calculated. The results are shown as curve 1 in FIG. In the figure, the horizontal axis represents water temperature (°C), and the vertical axis represents (dissolved oxygen amount measurement unit/saturated oxygen value)×100 (%). FIG. 6 shows the result according to the embodiment of the present invention in which the air vent pipe 5 was not used in the above and only the mineral-filled container 6 was used [shown as curve 2], and the result in which only the magnet was used without using the mineral-filled container 6. The results of a comparative example [shown as curve 3], and the results of a control example in which only aeration into the water was performed without using either the air vent pipe 5 or the mineral filling container 6 [shown as curve 4] Also listed. Further, in FIG. 6, the results of repeating the same test using an apparatus in which the mineral-filled container 6 was immersed in water in the water tank of the connecting pipe 3 shown in FIG. 1 are also shown as a curve 5. From FIG. 6 above, according to the implementation of the method of the present invention,
As shown by curves 1, 2 and 5, the activation and enrichment of dissolved oxygen in water can be achieved over a wide range of water temperatures, and this effect is especially evident when using the combination of air vent pipe 5 and mineral-filled container 6. It is clear that this is noticeable in some cases.

[Brief explanation of drawings]

FIG. 1 shows a schematic cross-sectional view of one particularly preferred apparatus for carrying out the method of the present invention. 2 and 3 show a perspective view and a central cross-sectional view, respectively, of a magnetic air vent tube 5 utilized in the apparatus shown in FIG. FIG. 4 is a longitudinal sectional view of the mineral filling container 6 used in the apparatus shown in FIG. FIG. 5 is a graph showing changes over time in the amount of dissolved oxygen in water by implementing the method according to Example 2 of the present invention. FIG. 6 is a graph showing the relationship between water temperature and the amount of oxygen dissolved in water by implementing the method according to Example 3 of the present invention.

Claims (1)

[Claims] 1. When aerating air into water to enrich dissolved oxygen in water, the air to be aerated into water is brought into contact with minerals having natural residual magnetization to activate magnetization, or together with the above-mentioned minerals. A method for enriching dissolved oxygen in water, characterized by applying a magnetic field to the air to excite oxygen in the air. 2. The method according to claim 1, wherein the mineral having natural residual magnetization is a crushed product or a sintered body of a mineral having 10 ^-4 to ^{10 -13} T. 3. The method according to claim 1, wherein the temperature of the treated water is 6 to 45°C. 4. A method according to claim 1, in which the action of the magnetic field is carried out by a permanent magnet. 5. The method according to claim 1, wherein the action of the magnetic field is carried out by an electromagnet. 6 The action of a magnetic field moves air at a speed of 0.5 m/s or more.
A method according to claim 1, which is carried out by exposure to a magnetic field having a magnetic flux density of 1000 to 4000 Gauss.