JP3925711B2 - Oxygen supply device for water - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
TECHNICAL FIELD The present invention relates to an oxygen supply device for water that improves water quality by supplying oxygen to anoxic water areas such as seas (ports), lakes, rivers, dams, moats and the like.
[0002]
[Prior art]
Domestic wastewater and industrial wastewater flow into the sea (ports), lakes, rivers, dams, moats, etc., and these wastewater contains organic substances and nutrient salts. Some of these settle to the bottom of the water and become organic sludge.
Since microorganisms in the water consume dissolved oxygen to decompose them, if the oxygen supply to the water in the bottom layer is less than the consumption, it becomes in an oxygen-poor state.
[0003]
When bottom water falls into an anoxic state, organic matter in the bottom mud is anaerobically decomposed, and substances harmful to organisms such as sulfides and methane gas are generated.
In addition, when the bottom mud becomes deficient in oxygen, nutrient salts in the bottom mud are likely to elute, increasing the concentration of nutrients in the water, and causing environmental deterioration such as the occurrence of blue sea bream and red tide.
[0004]
FIG. 8 shows a state in which a temperature rise layer A is formed in a port, a lake, a dam lake, etc. (hereinafter collectively referred to as “Lake 1”), where the temperature T is high near the water surface in summer and the temperature suddenly decreases as the water depth decreases. The bottom of the water has the lowest temperature (the solid line C shows the temperature distribution curve).
[0005]
In such a state, water having a low temperature and a high density in the lower layer forms a water mass, and hardly mixes with water having a high water temperature and a low density near the surface layer.
Accordingly, water having a high dissolved oxygen concentration near the surface layer is not supplied to the bottom layer, and the poor oxygen state of the bottom layer is not eliminated.
[0006]
Such a phenomenon is caused not only by the location due to the water temperature, but also by the formation of a salt concentration layer in which the salt concentration rapidly changes as in a brackish water area.
[0007]
FIG. 9 shows a conventional device for improving the water quality of the deteriorated bottom layer, and there are improvement techniques such as those using an air diffuser and a water flow generator. In FIG. 9, air diffused on the left side of the lake 1 The oxygen supply technology using the water flow generator is shown on the right side.
[0008]
First, an oxygen supply technique using an air diffuser will be described. The air diffuser sends air to the bottom of the water by the air compressor 2 and releases it from the air diffuser plate 3 to the bottom of the water. The dissolved oxygen from the upper layer is increased by the dissolved oxygen increase in the bottom layer and the destruction of the temperature climax by the entrained water. Is aimed at supplying water to the bottom of the water.
[0009]
However, in such a method, there is a problem that the bottom mud is rolled up by the entrained water, and nutrients are supplied from the lower layer to the upper layer, thereby deteriorating the water quality of the entire water area. In addition, destroying the thermocline in harbors, lakes, and large dams near semi-infinite requires a great deal of power and is not realistic.
[0010]
Next, an oxygen supply technique using a water flow generator will be described. As shown on the right side of FIG. 9, in this oxygen supply technique, the surface water rich in dissolved oxygen is sucked by the pump 4 constituting the water flow generator, and the surrounding water is taken as entrained water by discharging it to the bottom of the water. It is mixed with lower layer water to supply dissolved oxygen to the bottom layer.
[0011]
However, since the surface water has a high temperature and a low density, it does not mix with the low density water with a low temperature, and the bottom mud is rolled up as in the case described above, deteriorating the water quality of the entire water area. There was a disadvantage that it would end up.
[0012]
FIG. 10 shows a structure in which water in the bottom layer in an oxygen-poor state is pumped up, oxygen is dissolved in the water by an oxygen dissolving means to increase the dissolved oxygen concentration, and then returned to the original bottom layer.
In this way, if a device that returns low-temperature water to the original low-temperature water area, it will not be mixed due to the difference in density, and there will be no upflow due to high temperature, so bottom mud Will not stir.
[0013]
However, in the case shown in FIG. 10, it is necessary to absorb water from the bottom of the water to the surface of the water, and further to supply water from the top of the water to the bottom of the water. There is a problem that it increases and requires a lot of energy.
[0014]
[Problems to be solved by the invention]
The present invention has been made to solve the above-described problems, and an object thereof is to provide an apparatus for efficiently supplying oxygen to a desired water depth.
[Means for Solving the Problems]
In order to solve this object, an oxygen supply apparatus for water according to the present invention is as follows.
A device for supplying oxygen to the water to increase dissolved oxygen in the environment including seas, lakes, rivers, dams, and moats, and was installed in water below the temperature and / or salinity layer A pump, a tank arranged in a water area near the pump, and a gas delivery means arranged in the air, and injecting water sucked by the pump into a gas reservoir formed inside the tank The gas is mixed with the water sucked by the pump by sending the gas from the gas sending means to the front stage or the rear stage of the pump or at least one part of the tank, and the inside of the tank is pressurized using water pressure Thus, the gas is dissolved in the water sucked by the pump in the tank, and the gas-dissolved water is discharged from the vicinity of the bottom of the tank into the water. .
[0016]
In claim 2, in the oxygen supply device for water according to claim 1,
The discharge water from the pump is injected into a gas reservoir formed in the upper part of the tank.
[0017]
In claim 3, in the oxygen supply apparatus for water according to claim 1 or 2,
The water level in the tank is measured by measuring the difference between the pressure of the gas reservoir in the tank and the water pressure outside the tank, and the water level in the tank is maintained at a predetermined height.
[0018]
In Claim 4, in the oxygen supply device for water according to any one of Claims 1 to 3,
The water level in the tank is adjusted by adjusting the gas delivery amount from the gas delivery means.
[0019]
In Claim 5, in the oxygen supply device for water according to any one of Claims 1 to 4,
By releasing the gas in the gas reservoir formed in the upper part of the tank to the outside of the tank, the oxygen concentration in the gas reservoir in the tank is prevented from decreasing and the water level is adjusted.
[0020]
In claim 6, in the oxygen supply device for water according to claim 5,
The gas in the gas reservoir formed in the upper part of the tank is discharged onto the water through a conduit.
[0021]
In claim 7, in the oxygen supply device for water according to any one of claims 1 to 6,
When injecting water into the tank , a nozzle is provided at the tip, and the water ejected from the nozzle is arranged so as to generate a vortex in the water in the tank.
In claim 8, in the oxygen supply device for water according to any one of claims 1 to 6,
When injecting water into the tank , a nozzle is provided at the tip, and this nozzle is disposed near the top of the tank so that water ejected from the nozzle collides with a baffle plate disposed in the tank. To do.
[0023]
In Claim 10, in the gas supply apparatus to the water in any one of Claims 1 thru | or 8,
It is characterized in that water is discharged from the bottom surface of the tank in the horizontal direction.
[0024]
In claim 11, in the oxygen supply device for water according to any one of claims 1 to 10,
A channel extension means is provided in the tank to extend the length of the channel until the water supplied to the tank reaches the discharge port, thereby improving the solubility of the gas in the injected water and from the water discharge port. It is characterized by suppressing outflow of dissolved gas.
[0025]
In claim 12, in the oxygen supply device for water according to any one of claims 1 to 11,
A circulation line for injecting the gas in the gas reservoir in the upper part of the tank into at least one of the front stage and the rear stage of the pump is provided.
[0026]
In Claim 13, in the oxygen supply device for water according to any one of Claims 1 to 12,
The suction port of the pump and the discharge port of the tank are set so that the difference between the density of water in the area sucked by the pump and the density of water in the area discharged from the tank is a depth of 10 kg / m ^{3 or} less. It is characterized by installing.
[0027]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows an example of an embodiment according to claims 1 and 7 of the present invention, in which a pump 4a is arranged in a water area below a temperature climbing layer (see FIG. 8) in water. Similarly, the tank 7 is arranged in the water area near the submersible pump 4a. Air, high-concentration oxygen (hereinafter simply referred to as gas), or the like is sent from the water to the front and rear stages of the submersible pump 4a and the tank 7 (which may be at any one location). A line mixer 10 is provided after the gas delivery section at the rear stage of the pump so that more gas is dissolved. Reference numeral 8 denotes a nozzle provided at a water outlet into the tank 7.
[0028]
In the above configuration, the surrounding water is sucked by the submersible pump 4 a and injected into the tank 7. At this time, since the gas is sent from the air into the front stage, the rear stage of the submersible pump 4a, and the tank 7 (which may be any one place), the surrounding water is in a mixed state. Note that if the nozzle 8 outlet is arranged so as to generate vortices in the water during the injection into the tank 7, the surface area of the water surface increases, so that the gas is effectively dissolved.
Moreover, the undissolved gas is efficiently dissolved by the centrifugal force of the vortex.
[0029]
According to the above configuration, it is possible to save energy for sucking water from the bottom of the water to the surface of the water and further supplying water from the top of the water to the bottom of the water.
[0030]
FIG. 2 shows an example of an embodiment according to claims 2 and 7 of the present invention. In this embodiment, gas is sent to the front stage of the pump 4a and a line mixer 10 is provided at the rear stage, and this is also provided from above the water. The gas is sent so that more gas is mixed into the water. In addition, a gas is also sent from above the water into the tank 7 (any one may be provided), and the peripheral water sucked by the pump is injected into the gas reservoir 7a at the upper part of the tank 7. In this case, if the outlet of the nozzle 8 is arranged so as to generate a vortex in the water in the gas reservoir, many bubbles are generated when the water ejected from the nozzle collides with the water surface, and the contact area between the gas and water is increased. Since the surface area of the water surface is increased, the gas is effectively dissolved.
Moreover, the undissolved gas is efficiently dissolved by the centrifugal force of the vortex.
[0031]
FIG. 3 shows an example of an embodiment according to claims 2 to 6 and 8 of the present invention. In this example as well, the ambient water is injected into the gas reservoir 7a at the upper part of the tank 7 as in FIG.
[0032]
In the figure, 20 is a differential pressure gauge for measuring the difference between the pressure in the top space of the tank 7 and the water pressure outside the tank, 21 is a valve for discharging the gas in the tank 7, and 9 is the surface of the water in the tank 7. It is a baffle plate arranged in the vicinity.
[0033]
In the above configuration, the baffle plate 9 is arranged in a state where it is submerged above or slightly above the water surface. However, since the water level in the tank 7 has an optimum value, the water in the tank 7 is determined based on the output of the differential pressure gauge 20. Is maintained at a predetermined water level, and the gas pressure in the tank is adjusted.
[0034]
In the above configuration, the water sucked by the submersible pump 4 a is ejected from the nozzle 8 disposed at the top of the tank 7 and collides with the baffle plate 9. The water atomized by colliding with the baffle plate 9 dissolves the gas in the gas reservoir 7a and is discharged into the water from the vicinity of the bottom of the tank 7 as high-concentration gas-dissolved water. Normally, the water level gradually decreases because undissolved gas accumulates at the top of the tank 7, but when the predetermined water level is reached, the supply of gas is stopped to increase the water level.
[0035]
Further, nitrogen contained in the water is degassed or nitrogen concentration contained in the supply gas (air) increases the nitrogen concentration in the gas reservoir 7a in the tank (the oxygen concentration decreases). To do). In that case, the valve 21 is opened to release the oxygen in the gas reservoir 7a in the tank to the outside of the tank to prevent a decrease in the oxygen concentration in the gas reservoir and to adjust the water level.
[0036]
FIG. 4 is a block diagram showing an embodiment relating to claims 2 to 6, 8, and 11 of the present invention. In FIG. 4, the same elements as those in FIG. Reference numeral 23 a denotes an inner pipe formed in the tank 7 in the vertical direction, and the upper and lower portions of the inner pipe 23 a are opened and fixed to the tank 7. In this example, the nozzle 8 is provided in the vicinity of the top of the tank 7 in a direction substantially perpendicular to the water surface, and sprays to substantially the center of the inner pipe 23a. A baffle plate 9 is disposed substantially horizontally just below the nozzle injection direction.
[0037]
23b is an intermediate tube disposed between the outer side of the inner tube 23a and the inner periphery of the tank 7. The upper portion of the intermediate tube 23b is fixed to the vicinity of the top of the tank 1, and the lower portion is in contact with the vicinity of the bottom of the tank 7 and closed. It has become a state. The inner side of the middle tube 23b constitutes the first chamber 7b, and the outer side constitutes the second chamber 7c.
[0038]
In the above configuration, water ejected from above the inner tube 23a through the nozzle 8 collides with the baffle plate 9 to generate bubbles. Then, the gas supplied to the tank 7 is dissolved and flows in the A direction from below the inner tube 23a. At this time, the large bubbles rise in the direction a against the water flow and are released to the gas reservoir in the upper part of the tank 7.
[0039]
On the other hand, dissolution proceeds further while small bubbles drift in the same direction as the flow of water. Then, the bubbles contained in the water rise in the direction b and are released to the gas reservoir at the upper part of the dissolution tank.
[0040]
The water in which the gas is dissolved is discharged through the control valve 24. In this embodiment, when a large bubble has flowed in the direction b, it floats in the direction of the gas pool, so that the water flowing into the second chamber 7c becomes a high-concentration gas-dissolved water that does not contain a large bubble. Also in this embodiment, the gas is efficiently taken in by injecting the gas into the front stage of the pump 4a as shown in the figure or by injecting the gas in advance by attaching the line mixer 10 or the injector (not shown) in the rear stage. It is possible.
[0041]
FIG. 5 shows an example of an embodiment relating to claims 2 to 6, 8, and 9 of the present invention. This embodiment shows an example in which the bottom of the tank 7 is fully opened. Usually, in order to improve the solubility of gas, the inside of the tank is kept in a pressurized state. In this case, the solubility of the gas is improved by utilizing the water pressure by opening the bottom of the tank. Also in this embodiment, the gas is efficiently taken in by injecting the gas into the front stage of the pump 4a as shown in the figure or by injecting the gas in advance by attaching the line mixer 10 or the injector (not shown) in the rear stage. It is possible.
[0042]
FIG. 6 shows an example of an embodiment relating to claims 2 to 6, 8 and 10 of the present invention.
In the shape of the tank shown in FIG. 5, oxygen-dissolved water is released in a direction perpendicular to the bottom of the lake, so that the bottom mud may be rolled up.
In FIG. 6, the bottom surface of the tank 7 is covered with a bottom plate so that oxygen-dissolved water is discharged in the lateral direction. According to this shape, it is possible to prevent the oxygen-dissolved water from winding up the bottom mud.
[0043]
5 and 6 show an example in which the gas from the water is sent to the front stage of the pump 4a and is supplied into the line mixer 10 and the tank 7 provided in the rear stage. . Moreover, you may provide a flow-path extension means as shown in FIG.
[0044]
FIG. 7 shows an example of an embodiment related to claims 2 to 6, 8, and 12 of the present invention. This embodiment is different from FIG. 3 in that the gas supplied to the front stage and the rear stage of the pump 4a is stored in the tank 7. The gas is supplied from the internal gas reservoir 7 a through the circulation line 22. By providing the circulation line 22 in this manner, undissolved oxygen gas accumulated at the top of the tank can be reused.
[0045]
By the way, the submersible pump 4a and the tank 7 shown in FIGS. 1 to 7 may not necessarily be installed at the same position in water. In that case, the installation is performed in a range where the difference between the density of the water sucked by the pump and the density of the water near the bottom of the water discharged from the tank 7 is within 10 kg / m ³ . For example, in the case of seawater, the salinity concentration is about 3.5 wt. Therefore, if there is a density difference of this level, there is no increase in water and dissolved oxygen can be increased efficiently.
[0046]
The foregoing description of the present invention has only shown certain preferred embodiments for purposes of illustration and illustration. In the present embodiment, the gas to be dissolved has been described as oxygen. However, the gas to be dissolved in water may be, for example, ozone, and various gases can be used depending on the purpose.
[0047]
In addition, if unevenness | corrugation is formed in the surface of a baffle plate, generation | occurrence | production of a splash can be increased. Further, when the peripheral water is supplied to the tank, it is preferable that the nozzle tip be ejected in a tangential direction with respect to the water surface.
[0048]
It will be apparent to those skilled in the art that the present invention can be modified and modified in many ways without departing from the essence thereof. The scope of the present invention defined by the description in the appended claims is intended to include modifications and variations within the scope.
[0049]
【The invention's effect】
According to the present invention, it comprises a pump disposed in a water area below the temperature climatic layer and / or the salt climatic layer, a tank disposed in the water area in the vicinity of the pump, and a gas delivery means disposed in the air, The pump sucks the water sucked by the pump into a gas reservoir formed above the inside of the tank, and sends the gas from the gas sending means to the front stage or the rear stage of the pump or at least one place of the tank. The gas is mixed with the water sucked in the step, and the gas is dissolved in the water sucked by the pump in the tank by pressurizing the tank using water pressure. Since it is configured to be discharged into the water from the vicinity, it is not necessary to return the water to the original depth after pumping up water as in the past, and the tank is added using water pressure. For that comes out, it is possible to save energy.
[Brief description of the drawings]
FIG. 1 is a diagram showing an example of an embodiment according to claims 1 and 7 of the present invention.
FIG. 2 is a diagram showing an example of an embodiment according to claims 2 and 7 of the present invention.
FIG. 3 is a diagram showing an example of an embodiment according to claims 2 to 6 and 8 of the present invention.
FIG. 4 is a view showing an embodiment according to claims 2 to 6, 8, and 11 of the present invention.
FIG. 5 is a diagram showing an example of an embodiment according to claims 2 to 6, 8, and 9 of the present invention.
FIG. 6 is a diagram showing an example of an embodiment according to claims 2 to 6, 8, and 10 of the present invention.
FIG. 7 is a diagram showing an example of an embodiment according to claims 2 to 6, 8 and 12 of the present invention.
FIG. 8 is an explanatory diagram of a thermal climb layer formed in a lake or the like.
FIG. 9 is an explanatory view showing an example of a conventional oxygen supply device for water.
FIG. 10 is an explanatory view showing another example of a conventional oxygen supply device for water.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Lake 2 Air compressor 3 Air diffuser plate 4 Pump 5 Oxygen dissolution means 7 Tank 8 Nozzle 9 Baffle plate 10 Line mixer 20 Differential pressure gauge 21 Valve 24 Control valve

Claims (12)

A device for supplying oxygen to the water to increase dissolved oxygen in the environment including seas, lakes, rivers, dams, and moats, and was installed in water below the temperature and / or salinity layer A pump, a tank arranged in a water area near the pump, and a gas delivery means arranged in the air, and injecting water sucked by the pump into a gas reservoir formed inside the tank The gas is mixed with the water sucked by the pump by sending the gas from the gas sending means to the front stage or the rear stage of the pump or at least one part of the tank, and the inside of the tank is pressurized using water pressure Thus, the gas is dissolved in the water sucked by the pump in the tank, and the gas-dissolved water is discharged into water from the vicinity of the bottom of the tank. Oxygen supply device to. The water level in the tank is measured by measuring the difference between the pressure in the gas reservoir in the tank and the water pressure outside the tank, and the water level in the tank is maintained at a predetermined height. Item 2. The oxygen supply device for water according to Item 1 . The oxygen supply apparatus for water according to claim 1 or 2 , wherein the water level in the tank is adjusted by adjusting a gas delivery amount from the gas delivery means. By releasing gas reservoir of the gas formed inside above the tank outside the tank, according to claim 1, wherein adjusting the water level prevents the reduction of the oxygen concentration in reservoir said tank gas The oxygen supply apparatus to water in any one. The oxygen supply apparatus for water according to claim 4 , wherein a gas in a gas reservoir formed in the upper part of the tank is discharged onto the water through a conduit. The nozzle is provided at the distal end is when injecting water into the tank, the water ejected from the nozzle according to any one of claims 1 to 5, characterized in that arranged to generate a vortex in the water in the tank Equipment for supplying oxygen to water. When injecting water into the tank, a nozzle is provided at the tip, and this nozzle is disposed near the top of the tank so that water ejected from the nozzle collides with a baffle plate disposed in the tank. The oxygen supply device for water according to any one of claims 1 to 5 .   The apparatus for supplying oxygen to water according to any one of claims 1 to 7, wherein a bottom surface of the tank is opened and water is discharged toward the bottom of the water.   The apparatus for supplying gas into water according to any one of claims 1 to 8, wherein water is discharged from a bottom surface of the tank in a horizontal direction. A channel extension means is provided in the tank to extend the length of the channel until the water supplied to the tank reaches the discharge port, thereby improving the solubility of the gas in the injected water and from the water discharge port. The apparatus for supplying oxygen to water according to any one of claims 1 to 9 , wherein outflow of dissolved gas is suppressed. The oxygen supply apparatus for water according to any one of claims 1 to 10 , further comprising a circulation line for injecting a gas in a gas reservoir in the upper part of the tank into at least one of a front stage and a rear stage of the pump. The suction port of the pump and the discharge port of the tank are arranged so that the difference between the density of water in the area sucked by the pump and the density of water in the area discharged from the tank is a depth within 10 kg / m ^3. It installs, The oxygen supply apparatus to the water in any one of Claims 1 thru | or 11 characterized by the above-mentioned.

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