JP2022086681A - Gas dissolving apparatus and organic matter removing apparatus - Google Patents

Abstract

To provide a gas dissolving apparatus and an organic matter removing apparatus using the same that can increase the dissolution efficiency of the gases concerned by reusing the gases that remain undissolved when dissolving either oxygen gas, carbon dioxide gas, or ozone gas into water to be treated.SOLUTION: A gas dissolving apparatus 1a is provided with: an open vessel 4 that comprises a lid 2 having an outlet 2a, and a vessel 3 which has a liquid drainage port 3a, the upper part of which is covered by the lid 2; an ejector 5 installed in the liquid phase inside the open vessel 4; an overflow pipe 6 connected to the liquid drainage port 3a; a first self-priming pipe 11 that supplies oxygen gas to the ejector 5; and a second self-priming pipe 12 that is branched from the first self-priming pipe 11 and installed such that a suction port 12a is located in the gas phase inside the open vessel 4.SELECTED DRAWING: Figure 2

Description

The present invention relates to a device for dissolving a desired gas in water and a device for removing organic substances in a lake, a fish and shellfish farm, a sewage treatment plant, or the like, and in particular, reuses a gas that has not been dissolved in water. With respect to possible gas melting equipment.

Conventionally, an air diffuser has been installed at the bottom of lakes and marshes in order to increase the dissolved oxygen concentration in water. However, it is not possible to efficiently increase the dissolved oxygen concentration in water simply by supplying air to the water as in the case of an air diffuser.
As a solution to such a problem, for example, Patent Document 1 discloses an invention relating to an apparatus capable of increasing the dissolution efficiency of a gas under the name of "gas dissolving apparatus".

The invention disclosed in Patent Document 1 includes an ejector that discharges a gas-liquid mixed fluid consisting of a pressurized fluid and a gas that is to be dissolved in this liquid, and a dissolution tank to which this ejector is connected to the bottom. A plurality of melting cylinders having an opening at the upper end, a gas-liquid mixed fluid inlet at the upper part, a plurality of gas-liquid mixed fluid outlets at the lower part, and standing at intervals in the melting tank. A nozzle that is placed just above the upper end of each melting cylinder and ejects a jet that melts while entraining the undissolved gas that has accumulated in the upper part of the tank, and a nozzle that branches off from the pressurized liquid introduction pipe and is connected to the nozzle. It is equipped with a liquid introduction pipe for ejection that introduces the pressurized liquid of the pressurized liquid introduction pipe into the nozzle.
According to such a structure, after being supplied to the nozzle through the jet liquid introduction pipe branched from the pressurized liquid introduction pipe, the gas is ejected from the nozzle toward the undissolved gas accumulated in the upper part of the dissolution tank. The pressure liquid descends inside the dissolution cylinder while entraining the undissolved gas. In this case, since the floating of the gas is suppressed in the melting cylinder, the contact time between the gas and the liquid is extended. As a result, among the gases supplied together with the liquid from the ejector, the gas accumulated in the upper part of the dissolution tank without being dissolved can be caused to be secondarily dissolved.

Further, Patent Document 2 discloses an invention under the name of "gas absorption equipment" relating to equipment that can be used as a liquid treatment device for a soft drink containing carbon dioxide gas, a liquid treatment device for an ozone gas dissolving device, and the like.
The invention disclosed in Patent Document 2 includes a tank for storing carbonated water, an ejector-type nozzle that sucks and mixes gas supplied from a gas supply unit, a liquid supply line that supplies liquid to this nozzle, and a gas supply. It is characterized by having a gas supply line that supplies gas to the unit and a return line that is installed between the gas supply line and the tank and returns the surplus gas accumulated in the upper part of the tank to the gas supply line.
According to such a structure, the surplus gas in the tank is supplied to the gas supply unit again, so that the surplus gas can be effectively reused without being discharged.

Japanese Unexamined Patent Publication No. 2020-11196 Japanese Unexamined Patent Publication No. 9-295695

In the invention disclosed in Patent Document 1, since the gas cannot be sufficiently entrained only by ejecting the pressurized liquid into the gas accumulated in the upper part of the dissolution tank, the gas is applied to the liquid in the dissolution tank. There was a problem that it could not be dissolved efficiently.

In the invention disclosed in Patent Document 2, since the gas expelled from the carbonated water by being replaced with carbon dioxide gas is accumulated in the upper part of the tank, the gas and the surplus carbon dioxide gas are taken into the return line together. Therefore, there is a problem that the surplus gas cannot be reused efficiently.

The present invention has been made in response to such conventional circumstances, and is a gas that remains undissolved when any of oxygen gas, carbon dioxide gas, and ozone gas is dissolved in the water to be treated. It is an object of the present invention to provide a gas dissolving apparatus capable of increasing the dissolution efficiency of the gas and an organic substance removing apparatus using the gas dissolving apparatus by reusing the gas.

In order to achieve the above object, the organic substance removing device according to the first invention includes an open container in which a liquid is stored, an ejector in which a reduced diameter portion is formed between a nozzle and a diffuser, and an ejector. Inside the treated water supply means that supplies the liquid to be treated at a pressure higher than the atmospheric pressure, the first self-priming pipe that is connected to the reduced diameter portion at one end and the other end is communicated with the atmosphere, and the inside of the open container. The ejector is provided with a liquid amount adjusting means for discharging a desired amount of liquid from an open container so that a liquid phase and a gas phase are formed, and the ejector is at least partially arranged so that the outlet of the diffuser is arranged in the liquid phase. Is installed in the open container, and the upper part of the open container is characterized in that a discharge port is provided so that the gas phase communicates with the atmosphere.

In the organic matter removing device having the above structure, when the treated water having a pressure higher than the atmospheric pressure is supplied to the ejector from the treated water supply means, it is sucked into the first self-priming pipe by the negative pressure generated in the reduced diameter portion. Air (atmosphere) is ejected into the open container from the outlet of the diffuser in a state of being mixed with the water to be treated. As a result, the liquid supplied from the ejector into the open container is stored in the open container until the gas-liquid interface reaches a predetermined height by adjusting the discharge amount by the liquid amount adjusting means. At this time, the outlet of the diffuser of the ejector is arranged in the liquid phase. Therefore, the gas-liquid mixed fluid ejected from the diffuser of the ejector generates innumerable minute bubbles in the liquid stored in the open container.

When pollutants such as organic substances including waste products and excrement of aquatic organisms are present in the liquid in the open container, the pollutants tend to adhere to the surface of the above-mentioned minute bubbles. Therefore, the pollutant rises in the liquid together with the bubbles in a state of being attached to the bubbles. Then, the bubbles to which the pollutant adheres move to the gas phase region and become bubbles, and then are pushed up by other bubbles newly generated one after another to further rise in the gas phase, and finally from the discharge port. Overflow.

That is, in the organic substance removing device according to the first invention, the pollutant substances such as organic substances contained in the liquid stored in the open container eject the gas-liquid mixed fluid from the diffuser of the ejector, and the bubbles generated in the liquid. It has the effect of floating in the liquid while adhering to the liquid. Further, the pollutant has an action of rising in the gas phase in a state where bubbles are attached to the changed bubbles in the gas phase region, and finally being discharged from the discharge port to the outside of the open container. When the pollutant is not present in the liquid, the bubbles do not change into bubbles even when they reach the gas-liquid interface.

In the second invention, in the first invention, the open container comprises a container body in which at least a part of the ejector is installed inside, and a lid body covering the upper part of the container body. It is characterized in that it is provided with a discharge port and is detachably installed with respect to the container body.
In the second invention, in addition to the action of the first invention, by removing the lid to expose the inside of the container body, there is an action of facilitating cleaning, inspection, or repair of the inside of the open container.

Further, in the third invention, in the first invention or the second invention, the water supply means to be treated is a liquid supply pipe having one end connected to the nozzle to supply the water to be treated to the ejector, and the liquid supply pipe. The other end is a liquid supply pump connected to a discharge port, and a suction pipe for supplying water to be processed to the liquid supply pump.
In the third invention, in addition to the action of the first invention or the second invention, there is an action that the flow rate of the water to be treated to be supplied to the ejector is determined according to the discharge capacity of the liquid supply pump.

The gas dissolving apparatus according to the fourth invention is branched from the organic substance removing apparatus according to any one of the first inventions to the third invention and the first self-priming pipe, and the suction port is from the gas-liquid interface. The first self is provided with a second self-priming pipe arranged in the gas phase, a gas supply means installed outside the open container, and a flow control valve installed in the first self-priming pipe. The other end of the suction pipe is characterized in that a gas supply means for supplying any of oxygen gas, carbon dioxide gas, and ozone gas is connected instead of communicating with the atmosphere.
In the fourth invention, for example, when a bomb filled with any of oxygen gas, carbon dioxide gas, and ozone gas is installed as the gas supply means, the gas supplied from the gas supply means to the first self-priming pipe is used. When a gas-liquid mixed fluid composed of water to be treated is ejected from the diffuser of the ejector into an open container, the amount of the liquid in which the water to be treated and the above-mentioned gas are mixed is adjusted by the liquid amount adjusting means. Store in an open container until the gas-liquid interface reaches a predetermined height.

Since oxygen gas, carbon dioxide gas and ozone gas are more easily dissolved in water than nitrogen gas, the gas supplied from the gas supply means dissolves instead of the nitrogen gas previously dissolved in the liquid. Then, the nitrogen gas substituted with this gas moves to the region where the gas phase is formed by the atmosphere together with the gas remaining undissolved in the liquid. As a result, the air staying in the upper part of the open container is discharged to the outside of the open container from the discharge port. At this time, nitrogen gas lighter than oxygen gas, carbon dioxide gas and ozone gas moves upward above these gases, and a part of them is discharged to the outside of the open container from the discharge port, but most of the nitrogen gas. Residents at the top of the open vessel to form the first gas phase. The above-mentioned gas that has moved to the gas phase region together with the nitrogen gas is prevented from moving toward the discharge port by this first gas phase, so that the gas stays between the liquid and the first gas phase and the second gas is present. Form a phase.

At this time, since the suction port of the second self-priming tube is arranged in the second gas phase, a part of the above-mentioned gas forming the second gas phase is in the second gas phase. It is sucked into the self-priming tube and supplied to the ejector. Then, the above-mentioned gas supplied to the ejector from the second self-priming tube is ejected from the diffuser into the open container in a state of being mixed with the water to be treated.
As described above, in the fourth invention, after being supplied to the ejector from the gas supply means, the gas that is not completely dissolved and stays in the upper part of the open container is supplied to the ejector again.

According to a fifth aspect of the present invention, in the fourth aspect, the liquid amount adjusting means is connected to a drainage port provided at the lower part of the open container, one end thereof is connected to the drainage port, and the other end is from the nozzle of the ejector. It is characterized by being composed of an overflow pipe installed outside the open container so as to be located above and below the suction port of the second self-priming pipe.
In the fifth invention, when the water to be treated is continuously supplied into the open container via the ejector, the liquid (water to be treated) stored in the open container has the gas-liquid boundary surface at the open end of the overflow pipe (described above). When it reaches the lowest position on the inner surface of the other end), it begins to overflow from the open end. As a result, the gas-liquid interface of the liquid is maintained at the lowest position on the inner surface of the open end of the overflow pipe. Since the overflow pipe is attached to the open container so that the opening end is below the suction port of the second self-priming pipe, the gas-liquid interface of the liquid stored inside the open container is the overflow pipe. It does not reach the suction port of the second self-priming tube located above the opening end of the.
That is, in the fifth invention, in addition to the action of the fourth invention, the suction port of the second self-priming tube is not submerged in the above-mentioned liquid and is always arranged in the gas phase. It has the effect of. Further, in the fifth invention, since the open end of the overflow pipe is located above the ejector, the liquid is stored in the open container, and the gas-liquid interface thereof reaches the height defined by the overflow pipe. If so, it has the effect of placing the ejector in the liquid described above.

The sixth invention is characterized in that, in the fourth invention or the fifth invention, the flow rate adjusting valve is a solenoid valve.
In the sixth invention, in addition to the action of the fourth invention or the fifth invention, the sixth invention has an action of adjusting the flow rate of the gas supplied to the ejector via the first self-priming tube by remote control.

The seventh invention is characterized in that, in any one of the fourth invention to the sixth invention, a flow meter is installed in the first self-priming pipe.
In the seventh invention, in addition to the action of any one of the fourth invention to the sixth invention, the flow rate of the gas supplied to the ejector through the first self-priming tube is accurately detected by the flow meter. Has the effect of

In the first invention, the eighth invention includes a water quality improver instead of the ejector, and the water quality improver is formed so as to be substantially rotationally symmetric and to be reduced in diameter in both directions of the axis of rotational symmetry. It has a body with a hollow part, a liquid bubble generation container with both ends open and a treated water discharge port on the side surface, and a pipe arranged coaxially with the axis of rotational symmetry of the body. The body is provided with a liquid introduction hole in the peripheral wall so as to open in the tangential direction, and a gas / liquid ejection hole is provided at the end of the reduced diameter portion so as to open in one of the axes of rotational symmetry. Is placed above the body and fixed to the outer wall of the body so as to surround the air-liquid ejection hole. The water to be treated means is installed in the vicinity, and the water to be treated is supplied from the liquid introduction hole to the water quality improver installed inside the open container so that the axis of rotational symmetry of the body is parallel to the vertical direction. However, one end of the first self-priming pipe is connected to the pipe of the water quality improving device.

In the organic matter removing device having the above structure, when the treated water having a pressure higher than the atmospheric pressure is supplied to the water quality improving device from the treated water supply means, the treated water causes a swirling flow around the axis of rotational symmetry of the device. Is generated, and a negative pressure gas axis is formed at the same position as the axis of rotational symmetry along with the swirling flow. Since the gas-liquid ejection hole is close to the gas-liquid interface, the air supplied to the body from the pipe is discharged from the gas-liquid ejection hole. Then, while forming a swirling flow, a large amount of liquid bubbles are generated in the liquid bubble generation container by the water to be treated ejected from the gas / liquid ejection hole together with the air, and a part of the liquid bubbles in the open container are generated from the treated water discharge port. It is discharged into (water to be treated) and becomes bubbles. Since pollutants such as organic substances including waste products and excrement of aquatic organisms existing in the liquid in the open container easily adhere to the surface of the bubbles, they rise in the liquid in a state of being attached to the bubbles. Then, these bubbles become bubbles in the gas phase, are pushed up by other bubbles newly generated one after another, rise further, and finally overflow from the discharge port.

That is, in the organic substance removing device according to the eighth invention, pollutants such as organic substances contained in the liquid stored in the open container float in the liquid in a state of being attached to the bubbles generated by the water quality improver, and further. In the gas phase region, the bubbles rise in the gas phase in a state of being attached to the changed foam, and finally have the effect of being discharged from the discharge port to the outside of the open container.

The ninth invention comprises an organic substance removing device according to an eighth invention, a second self-priming tube that branches from the first self-priming tube and a suction port is arranged in the gas phase from the gas-liquid interface, and is open. It is provided with a gas supply means installed outside the container and a flow control valve installed in the first self-priming pipe, and the other end of the first self-priming pipe is oxygen gas instead of communicating with the atmosphere. , A gas supply means for supplying any gas of carbon dioxide gas and ozone gas is connected.
In the ninth invention, for example, when a cylinder filled with any gas of oxygen gas, carbon dioxide gas or ozone gas is installed as a gas supply means, the treated water in a state of being pressurized by the water quality improver. Is supplied, one of oxygen gas, carbon dioxide gas, and ozone gas is self-sucked from the upper part of the pipe, and a large amount of liquid foam is generated in the liquid foam generation container. At this time, the liquid stored in the open container is discharged at a predetermined height by adjusting the discharge amount by the liquid amount adjusting means.

Oxygen gas, carbon dioxide gas and ozone gas, which are more soluble in water than nitrogen gas, dissolve in water to be treated instead of nitrogen gas. Then, the nitrogen gas substituted with these gases moves to the region where the gas phase is formed by the atmosphere together with the gas remaining undissolved in the liquid. As a result, the air staying in the upper part of the open container is discharged to the outside of the open container from the discharge port. At this time, nitrogen gas lighter than oxygen gas, carbon dioxide gas and ozone gas moves upward above these gases, and a part of them is discharged to the outside of the open container from the discharge port, but most of the nitrogen gas. Residents at the top of the open vessel to form the first gas phase. The above-mentioned gas that has moved to the gas phase region together with the nitrogen gas is prevented from moving toward the discharge port by this first gas phase, so that the gas stays between the liquid and the first gas phase and the second gas is present. Form a phase.

At this time, since the suction port of the second self-priming pipe is arranged in the second gas phase, a part of the above-mentioned gas forming the second gas phase is in the second gas phase. It is sucked into the self-priming pipe and supplied to the water quality improver. As described above, in the ninth invention, after being supplied to the water quality improver from the gas supply means, the gas that is not completely dissolved and stays in the upper part of the open container is supplied to the water quality improver again. Has an action.

When the pollutant is not present in the liquid stored in the open container, the bubbles do not change into bubbles even if they reach the gas-liquid interface. Therefore, according to the first invention, the gas-liquid mixed fluid is ejected from the diffuser of the ejector and the work of removing the foam overflowing from the discharge port is continued until the foam is no longer generated, so that the fluid is stored in the open container. It is possible to separate the above-mentioned pollutants from the liquid and remove them almost completely.

According to the second invention, in addition to the effect of the first invention, since the inside of the open container can be easily cleaned, inspected, or repaired, the cost required for maintenance can be reduced.

According to the third invention, in addition to the effects of the first invention or the second invention, by selecting a liquid supply pump having an appropriate discharge capacity suitable for the purpose, a desired flow rate of water to be treated is ejected. It has the effect of being able to supply to.

According to the fourth invention, when the gas-liquid mixed fluid is generated in the ejector, the oxygen gas, carbon dioxide gas, or ozone gas that is not completely dissolved in the water to be treated and stays in the open container can be reused. Therefore, it is possible to efficiently dissolve the gas in the water to be treated.

According to the fifth invention, in addition to the effect of the fourth invention, the height of the gas-liquid interface is detected, and the flow rate of the liquid discharged from the drain port is controlled based on the detection result. Compared with the case where the height of the liquid boundary surface is kept constant, it is possible to reduce the cost for manufacturing the apparatus of the present invention.

According to the sixth invention, in addition to the effects of the fourth invention or the fifth invention, the gas supplied to the ejector via the first self-priming tube even when a plurality of gas melting devices of the present invention are installed. It has the effect of increasing the work efficiency when adjusting the flow rate of the gas.

According to the seventh invention, in addition to the effect of any one of the fourth invention to the sixth invention, the flow rate of the gas supplied to the ejector through the first self-priming tube is accurately grasped. It has the effect that the gas remaining without being dissolved can be efficiently taken into the second self-priming tube.

According to the eighth invention, the water to be treated is supplied to the water quality improver until the bubbles are no longer generated, and the work of removing the bubbles overflowing from the discharge port is continued, so that the water is stored in the open container. It is possible to separate the above-mentioned pollutants from the liquid and remove them almost completely.

According to the ninth invention, when the liquid foam is generated in the water quality improver, the oxygen gas, carbon dioxide gas, or ozone gas that is not completely dissolved in the water to be treated and stays in the open container can be reused. , The gas can be efficiently dissolved in the water to be treated.

It is a figure which showed an example of the appearance of the gas melting apparatus which concerns on embodiment of this invention. FIG. 1 is a cross-sectional view taken along the line AA in FIG. FIG. 2 is a diagram schematically showing the state of the gas phase formed in the upper part of the open container in FIG. 2. FIG. 2 is a diagram schematically showing the state of the gas phase formed in the upper part of the open container in FIG. 2. FIG. 2 is a diagram schematically showing the state of the gas phase formed in the upper part of the open container in FIG. 2. It is a figure which schematically represented the operation of the organic matter removing apparatus which concerns on embodiment of this invention. It is sectional drawing which showed Example 2 of the gas melting apparatus which concerns on embodiment of this invention. It is sectional drawing which showed Example 3 of the gas melting apparatus which concerns on embodiment of this invention. (A) is an external view of the water quality improver shown in FIG. 8, and (b) and (c) are the E direction arrow view in the same figure (a) and the FF line arrow in the same figure (b), respectively. It is a sectional view. 9 is an enlarged view of FIG. 9 (c).

The gas dissolving apparatus of the present invention will be described with reference to FIGS. 1 to 5 and 7 to 10, and the organic matter removing apparatus of the present invention will be described with reference to FIG.

FIG. 1 shows the appearance of the gas dissolving apparatus of the present invention, and FIG. 2 is a cross-sectional view taken along the line AA in FIG. In FIG. 2, the appearance of the ejector and the pipe is displayed instead of displaying the cross section.
As shown in FIGS. 1 and 2, the gas dissolving device 1a is an open container 4 composed of a lid 2 having a discharge port 2a and a container body 3 having a drain port 3a and whose upper portion is covered by the lid 2. And an ejector 5 installed inside the open container 4 is provided.

The lid 2 and the container body 3 are each provided with flanges 2b and 3b having a plurality of bolt holes (not shown), and the lid 2 communicates with the container body 3 through the bolt holes of the flange 2b and the flange 3b. The nut 7b is fixed to the bolt 7a so as to be tightened. That is, the open container 4 has a structure in which the lid 2 is detachably attached to the container body 3.
That is, in the gas melting device 1a, when the lid 2 is removed, the inside of the container body 3 is exposed, so that the inside of the open container 4 can be easily cleaned, inspected, or repaired. This reduces maintenance costs.

The discharge port 2a of the lid 2 is provided at a position at the top of the open container 4 when the lid 2 is attached to the container body 3, and is provided in the vicinity of the bottom 3c of the container body 3. An overflow pipe 6 is connected to the liquid port 3a. As will be described later, the discharge port 2a has a function of discharging the gas staying inside the open container 4 to the outside of the open container 4. Therefore, the discharge port 2a needs to be provided in the upper part of the open container 4 so that the gas phase formed by the gas staying inside the open container 4 communicates with the atmosphere. However, in order to preferentially discharge the gas staying at the uppermost portion, it is desirable that the discharge port 2a is provided at the uppermost portion of the open container 4.

When the water to be treated is continuously supplied to the inside of the open container 4 via the ejector 5, the liquid (water to be treated) stored in the open container 4 has a gas-liquid boundary surface on the inner surface of the open end 6a of the overflow pipe 6. When it reaches the lowest position, it starts to overflow from the opening end 6a. As a result, the gas-liquid interface of the liquid is maintained at the lowest position on the inner surface of the open end 6a of the overflow pipe 6.
Further, the inside of the open container 4 communicates with the outside atmosphere through the discharge port 2a of the lid body 2. Therefore, a gas phase is formed by the atmosphere in the upper part of the open container 4 (the portion above the gas-liquid boundary surface). That is, in the gas melting device 1a, the overflow pipe 6 maintains the gas-liquid boundary surface of the liquid stored inside the open container 4 at a constant height so that the gas phase is formed in the upper part of the open container 4. It has the effect of.

The overflow pipe 6 is attached to the open container 4 so that the open end 6a is below the suction port 12a of the second self-priming pipe 12. Therefore, the gas-liquid boundary surface of the liquid stored inside the open container 4 does not reach the suction port 12a of the second self-priming pipe 12 located above the opening end 6a of the overflow pipe 6. Therefore, in the second self-priming tube 12, the suction port 12a is not submerged in the liquid described above, and is always arranged in the gas phase.
Further, the open end 6a of the overflow pipe 6 is located above the ejector 5. Therefore, when the liquid is stored in the open container 4 and the gas-liquid interface thereof reaches the height defined by the overflow pipe 6, the ejector 5 is placed in the liquid described above.

In the gas melting device 1a, instead of installing the overflow pipe 6, the height of the gas-liquid interface is detected, and the flow rate of the liquid discharged from the drain port 3a is controlled based on the detection result. It is also possible to have a structure that keeps the height of the gas-liquid interface constant. However, when the overflow pipe 6 is installed, the cost for manufacturing the gas melting device 1a can be reduced as compared with the case where the above device is installed.

A liquid supply pipe 8 having one end connected to the nozzle 5a of the ejector 5 is inserted into the liquid supply port 3e provided on the side surface 3d of the main body container 3. Further, the other end of the liquid supply pipe 8 is installed outside the open container 4 and is connected to the discharge port of the liquid supply pump 10 that pressurizes and discharges the supplied liquid until the pressure becomes higher than the atmospheric pressure. The other end of the suction pipe 9 whose one end is connected to the storage tank (not shown) of the water to be treated is connected to the suction port of the liquid supply pump 10. That is, the liquid supply pipe 8, the suction pipe 9, and the liquid supply pump 10 constitute a water to be treated water supply means that pressurizes the water to be treated and supplies it to the ejector 5 so as to show a pressure higher than the atmospheric pressure.
Instead of using the liquid supply pump 10, the water to be treated may exhibit a pressure higher than the atmospheric pressure by applying a water pressure due to a water pressure or a head difference. However, when the liquid supply pump 10 is used, the flow rate of the water to be treated to be supplied to the ejector 5 is determined according to the discharge capacity, so that the liquid supply pump 10 having an appropriate discharge capacity suitable for the purpose is selected. This makes it possible to supply the ejector 5 with a desired flow rate of water to be treated.

One end of the air supply port 3f provided above the liquid supply port 3e on the side surface 3d of the main body container 3 is connected to a reduced diameter portion 5c formed between the nozzle 5a of the ejector 5 and the diffuser 5b, and at the same time. A first self-priming pipe 11 having the other end connected to an oxygen gas supply means such as an oxygen cylinder arranged outside the open container 4 is inserted. Further, inside the open container 4, a second self-priming pipe 12 branching from the first self-priming pipe 11 is installed so that the suction port 12a is located above the diffuser 5b.

A flow rate adjusting valve 13a and a flow meter 14a are installed in the first self-priming pipe 11, and a flow rate adjusting valve 13b is installed in the second self-priming pipe 12. A flow rate adjusting valve 13c and a pressure gauge 14b are installed in the liquid supply pipe 8.
That is, the first self-priming pipe 11 has a structure capable of supplying oxygen gas by opening the flow rate adjusting valve 13a, and the second self-priming pipe 12 is opened by opening the flow rate adjusting valve 13b as described later. The structure is such that the gas inside the container 4 can be supplied to the ejector 5. The liquid supply pipe 8 has a structure capable of supplying the water to be treated supplied by the liquid supply pump 10 to the ejector 5 by opening the flow rate adjusting valve 13c, as will be described later.

In the gas melting device 1a having the above structure, when the liquid supply pump 10 is operated with the flow rate adjusting valve 13c open, the water to be treated stored in the above-mentioned storage tank is pumped up through the suction pipe 9. , It is supplied to the ejector 5 from the liquid supply pipe 8 in a pressurized state.
The inner diameter of the ejector 5 gradually decreases from the upstream side (closer to the liquid supply pipe 8) to the downstream side (closer to the reduced diameter portion 5c) in the nozzle 5a, and after becoming the minimum in the reduced diameter portion 5c, In the diffuser 5b, the size gradually increases from the upstream side (the side close to the reduced diameter portion 5c) to the downstream side (the side where the opening is provided). Therefore, the velocity of the liquid (water to be treated) flowing inside the ejector 5 gradually increases inside the nozzle 5a and becomes maximum in the reduced diameter portion 5c. According to Bernoulli's theorem, since the pressure of the fluid is low at the place where the speed of the fluid is high, the pressure of the liquid (water to be treated) is the lowest in the reduced diameter portion 5c, and the negative pressure is applied to the reduced diameter portion 5c of the ejector 5. Occurs.

When the flow rate adjusting valve 13a is open, as described above, due to the negative pressure generated in the reduced diameter portion 5c of the ejector 5, the oxygen gas filled in the oxygen cylinder is passed through the first self-priming pipe 11 to the ejector 5. It is supplied to the reduced diameter portion 5c of. When the flow rate adjusting valve 13b is open, the gas inside the open container 4 sucked in through the second self-priming pipe 12 is supplied to the reduced diameter portion 5c of the ejector 5.
That is, when at least one of the flow rate adjusting valves 13a and 13b is open, the gas supplied by the first self-priming pipe 11 or the second self-priming pipe 12 is mixed with the water to be treated in the ejector 5, and the gas and liquid are mixed. As a mixed fluid, it is ejected from the diffuser 5b into the inside of the open container 4. The ratio of the gas supplied to the ejector 5 from the first self-priming pipe 11 and the second self-priming pipe 12 is determined by the opening degree of the flow rate adjusting valves 13a and 13b. For example, with only the flow rate adjusting valve 13a open, a certain amount of water to be treated is supplied from the liquid supply pipe 8 to the ejector 5, and 8 liters of oxygen gas per minute is supplied from the oxygen cylinder to the first self-priming pipe 11. When the flow rate adjusting valve 13b is opened and the opening degree of the flow rate adjusting valve 13a is adjusted so that 6 liters of oxygen gas per minute is supplied from the oxygen cylinder to the first self-priming pipe 11, the flow rate adjusting valve 13a is opened. The amount of gas inside the container 4 sucked into the second self-priming pipe 12 is 2 liters per minute.

As described above, in the gas melting device 1a in which the flow rate adjusting valves 13a and 13b are installed in the first self-priming pipe 11 and the second self-priming pipe 12, the opening degree of the flow rate adjusting valves 13a and 13b is changed to change the opening degree. It is possible to adjust the ratio of the gas supplied to the ejector 5 from the self-priming pipe 11 of 1 and the self-priming pipe 12 of the second self-priming pipe 12. Then, since the flow rate of the gas supplied to the ejector 5 via the first self-priming pipe 11 is accurately grasped by the flow meter 14a, the opening degrees of the flow rate adjusting valves 13a and 13b are changed to change the opening degree of the first self-priming pipe 11. And the ratio of the gas supplied from the second self-priming tube 12 to the ejector 5 can be appropriately set. Therefore, according to the gas melting device 1a, the gas remaining inside the open container 4 without being melted can be efficiently taken into the second self-priming tube 12.

Next, the operation and effect of the gas dissolving apparatus 1a will be described with reference to Table 1 and FIGS. 3 to 5.
Table 1 shows the molecular weights and ratios of the main gases constituting the dry air (volume ratio of each gas) and the solubility of each gas in water. The solubility shown in the table is the volume (unit: cm ³ ) when each gas is dissolved in 1 cm ³ water at 1 atm as the ratio of the volume to the volume in nitrogen. 3 to 5 are diagrams schematically showing the state of the gas phase formed in the upper part of the open container 4 in FIG. 2.
The broken line shown in FIGS. 3 to 5 represents the boundary of the gas phase formed by each gas. Further, in order to avoid complicating the drawings in FIGS. 3 to 5, the suction pipe 9, the liquid supply pump 10, the flow rate adjusting valves 13a and 13c, the flow meter 14a and the pressure gauge 14b shown in FIG. 2 are the same. Illustration is omitted.

Looking at Table 1, it can be seen that, for example, the solubility of oxygen in water at 20 ° C. is about twice that of nitrogen, and oxygen gas is a gas that is more easily dissolved in water than nitrogen gas. Further, the solubility of carbon dioxide gas in water at 20 ° C. is 55 times that of nitrogen gas, and it can be seen that carbon dioxide gas is a gas that is more easily dissolved in water than oxygen gas or nitrogen gas.

As shown in FIG. 2, when a gas-liquid mixed fluid composed of oxygen gas supplied from the first self-priming pipe 11 and water to be treated is ejected from the diffuser 5b of the ejector 5 into the inside of the open container 4, it becomes the water to be treated. The liquid mixed with oxygen gas (the above-mentioned gas-liquid mixed fluid) is stored in the open container 4 until the gas-liquid interface reaches the height defined by the overflow pipe 6. Then, in the liquid stored in the open container 4, innumerable minute bubbles are generated by the ejection of the gas-liquid mixed fluid from the diffuser 5b of the ejector 5.
As described above, since oxygen gas is more easily dissolved in water than nitrogen gas, oxygen gas dissolves in the above liquid instead of the nitrogen gas previously dissolved. Then, the nitrogen gas replaced with the oxygen gas moves to the region where the gas phase is formed by the atmosphere together with the oxygen gas remaining undissolved in the liquid. As a result, the air retained in the upper part of the open container 4 is discharged to the outside of the open container 4 from the discharge port 2a of the lid 2.
As shown in Table 1, since nitrogen gas is lighter than oxygen gas, it moves above the oxygen gas, and a part of it is discharged from the discharge port 2a of the lid 2 to the outside of the open container 4, but most of it. Nitrogen gas stays in the uppermost part of the open container 4 and forms a first gas phase.

On the other hand, the oxygen gas that has moved to the gas phase region together with the nitrogen gas is hindered from moving toward the discharge port 2a by this first gas phase, so that the oxygen gas stays between the liquid and the first gas phase and is second. Form the gas phase of.
Since the suction port 12a of the second self-priming pipe 12 is arranged in the second gas phase, when the flow rate adjusting valve 13b is opened, the second gas phase is formed as shown by the arrow B. A part of the oxygen gas present is sucked into the second self-priming pipe 12 and sent to the ejector 5. Then, the oxygen gas sent from the second self-priming pipe 12 to the ejector 5 is ejected from the diffuser 5b into the open container 4 in a state of being mixed with the water to be treated supplied from the liquid supply pipe 8 to the ejector 5. To. As described above, in the gas melting device 1a, when the gas-liquid mixed fluid is generated in the ejector 5, the oxygen gas staying inside the open container 4 can be reused. As a result, the efficiency of dissolving oxygen gas in the water to be treated is increased.
On the other hand, in the inside of the open container 4, the liquid whose dissolved amount of oxygen gas has increased due to the replacement of nitrogen gas with oxygen gas is the drainage liquid provided at the bottom 3c of the container body 3 as shown by the arrow of the broken line. It is discharged from the mouth 3a through the overflow pipe 6 to the outside of the open container 4. Then, the liquid discharged from the overflow pipe 6 is returned to the above-mentioned storage tank of the water to be treated to which one end of the suction pipe 9 is connected.

Next, a procedure for dissolving carbon dioxide gas in the water to be treated using the gas dissolving apparatus 1a will be described with reference to FIG.
First, a carbon dioxide gas supply means such as a cylinder filled with carbon dioxide gas is connected to the open end of the first self-priming pipe 11 instead of the oxygen gas supply means such as an oxygen cylinder. Then, as shown in FIG. 2, when a gas-liquid mixed fluid composed of carbon dioxide gas supplied from the first self-priming pipe 11 and water to be treated is ejected from the diffuser 5b into the open container 4, this liquid is released. It is stored in the open container 4 until the gas-liquid interface reaches the height defined by the overflow pipe 6. At this time, innumerable minute bubbles are generated in the liquid stored in the open container 4 due to the ejection of the gas-liquid mixed fluid from the diffuser 5b of the ejector 5.

As described above, since carbon dioxide gas is more easily dissolved in water than oxygen gas or nitrogen gas, carbon dioxide gas dissolves in the above liquid instead of the nitrogen gas and oxygen gas previously dissolved. Then, the nitrogen gas and the oxygen gas substituted with the carbon dioxide gas move to the gas phase region together with the carbon dioxide gas remaining undissolved in the liquid. As a result, the air that has stayed in the upper part of the open container 4 is discharged to the outside of the open container 4 from the discharge port 2a of the lid 2.
As already mentioned, since nitrogen gas is lighter than oxygen gas, the nitrogen gas that has moved above the oxygen gas is partially discharged to the outside of the open container 4 from the discharge port 2a of the lid 2, but it is large. The portion of nitrogen gas stays at the top of the open vessel 4 to form the first gas phase. Further, since carbon dioxide gas is heavier than oxygen gas, a second gas phase composed of oxygen gas is formed under the first gas phase, and further, it is composed of carbon dioxide gas under the second gas phase. A third gas phase is formed.

Since the suction port 12a of the second self-priming pipe 12 is arranged in the third gas phase, when the flow rate adjusting valve 13b is opened, the third gas phase is formed as shown by the arrow C. A part of the carbon dioxide gas present is sucked into the second self-priming pipe 12 and sent to the ejector 5. Then, the carbon dioxide gas sent from the second self-priming pipe 12 to the ejector 5 is ejected from the diffuser 5b into the open container 4 in a state of being mixed with the water to be treated supplied from the liquid supply pipe 8 to the ejector 5. Will be done.

As described above, in the gas melting device 1a, it is possible to reuse the carbon dioxide gas staying inside the open container 4 when the gas-liquid mixed fluid is generated in the ejector 5. This increases the dissolution efficiency of carbon dioxide gas in the water to be treated.
On the other hand, in the inside of the open container 4, the liquid in which the dissolved amount of the carbon dioxide gas is increased due to the replacement of the nitrogen gas and the oxygen gas with the carbon dioxide gas is located at the bottom 3c of the container body 3 as shown by the broken arrow. It is discharged to the outside of the open container 4 from the provided drain port 3a through the overflow pipe 6. Then, the liquid discharged from the overflow pipe 6 is returned to the above-mentioned storage tank of the water to be treated to which one end of the suction pipe 9 is connected.

Further, a method of dissolving ozone gas in the water to be treated using the gas dissolving apparatus 1a will be described with reference to FIG.
First, an ozone gas supply means such as a cylinder filled with ozone gas is connected to the open end of the first self-priming pipe 11 instead of the oxygen supply means such as an oxygen cylinder. Then, as shown in FIG. 2, when a gas-liquid mixed fluid composed of ozone gas and water to be treated supplied from the first self-priming pipe 11 is ejected from the diffuser 5b into the open container 4, this liquid becomes gas-liquid. It is stored in the open container 4 until the boundary surface reaches the height specified by the overflow pipe 6. At this time, innumerable minute bubbles are generated in the liquid stored in the open container 4 due to the ejection of the gas-liquid mixed fluid from the diffuser 5b of the ejector 5.

Ozone gas _, whose chemical formula is represented by O3 and whose molecular weight is 48, is heavier than oxygen gas and carbon dioxide gas. The solubility of ozone gas in water at 20 ° C is about 10 times that of oxygen gas, and although ozone gas is less soluble in water than carbon dioxide gas, it is more soluble in water than oxygen gas or nitrogen gas. Is known to be. Therefore, the nitrogen gas and the oxygen gas that had been dissolved until then are expelled, and the ozone gas is instead dissolved in the above liquid. Then, the nitrogen gas and the oxygen gas substituted with the ozone gas move to the gas phase region together with the ozone gas remaining undissolved in the liquid. As a result, the air that has stayed in the upper part of the open container 4 is discharged to the outside of the open container 4 from the discharge port 2a of the lid 2.
As already mentioned, since nitrogen gas is lighter than oxygen gas, the nitrogen gas that has moved above the oxygen gas is partially discharged to the outside of the open container 4 from the discharge port 2a of the lid 2, but it is large. The portion of nitrogen gas stays at the top of the open vessel 4 to form the first gas phase. Further, since ozone gas is heavier than oxygen gas, a second gas phase composed of oxygen gas is formed under the first gas phase, and a fourth gas composed of ozone gas is further formed under the second gas phase. A phase is formed.

Since the suction port 12a of the second self-priming pipe 12 is arranged in the fourth gas phase, when the flow rate adjusting valve 13b is opened, the fourth gas phase is formed as shown by the arrow D. A part of the ozone gas is sucked into the second self-priming pipe 12 and sent to the ejector 5. As a result, the ozone gas sent from the second self-priming pipe 12 to the ejector 5 is ejected from the diffuser 5b into the open container 4 in a state of being mixed with the water to be treated supplied from the liquid supply pipe 8 to the ejector 5. To.

As described above, in the gas melting device 1a, it is possible to reuse the ozone gas retained inside the open container 4 when the gas-liquid mixture fluid is generated in the ejector 5. This increases the dissolution efficiency of ozone gas in the water to be treated.
On the other hand, in the inside of the open container 4, the liquid whose dissolved amount of ozone gas has increased due to the replacement of nitrogen gas and oxygen gas with ozone gas is discharged provided at the bottom 3c of the container body 3 as shown by the broken arrow. It is discharged from the liquid port 3a through the overflow pipe 6 to the outside of the open container 4. Then, the liquid discharged from the overflow pipe 6 is returned to the above-mentioned storage tank of the water to be treated to which one end of the suction pipe 9 is connected.
As described above, according to the gas dissolving device 1a, when the gas-liquid mixed fluid is generated in the ejector 5, oxygen gas, carbon dioxide gas and ozone gas remaining without being dissolved in the liquid inside the open container 4 are generated. Since any of the gases can be reused, these gases can be efficiently dissolved in the water to be treated.

Next, the organic matter removing apparatus according to the present invention will be described with reference to FIG. FIG. 6 shows a state in which the gas dissolving device 1a is used as an organic substance removing device, and corresponds to FIG. 2 in the gas dissolving device 1a. The components shown in FIGS. 1 to 5 are designated by the same reference numerals, and the description thereof will be omitted as appropriate.
In the gas melting device 1a, the oxygen gas supply means such as an oxygen cylinder connected to the open end of the first self-priming pipe 11 is removed, the first self-priming pipe 11 is communicated with the atmosphere, and the flow rate adjusting valve 13b is closed. When the liquid supply pump 10 is operated in this state, the water to be treated pumped from the above-mentioned storage tank via the suction pipe 9 is supplied from the liquid supply pipe 8 to the ejector 5 in a pressurized state.

When the water to be treated reaches the reduced diameter portion 5c through the nozzle 5a of the ejector 5, the air sucked from the first self-priming pipe 11 (the above-mentioned atmosphere) due to the negative pressure generated in the reduced diameter portion 5c becomes the reduced diameter portion. It is supplied to 5c. Since the flow rate adjusting valve 13b is closed, there is no possibility that the gas existing inside the open container 4 will be sucked into the second self-priming pipe 12 and supplied to the ejector 5.
The liquid (gas-liquid mixed fluid) in which the air supplied to the ejector 5 from the first self-priming pipe 11 is mixed with the water to be treated is ejected from the diffuser 5b into the inside of the open container 4. As a result, the liquid is stored in the open container 4 until the gas-liquid interface reaches the height defined by the overflow pipe 6. At this time, since the outlet of the diffuser 5b of the ejector 5 is arranged in the liquid phase, innumerable minute bubbles are generated in the liquid by the gas-liquid mixed fluid ejected from the diffuser 5b of the ejector 5 into the liquid.

When a pollutant such as an organic substance including waste products and excrement of aquatic organisms is present in the liquid, the pollutant easily adheres to the surface of the above-mentioned minute bubbles, so that the pollutant adheres to the bubbles. Ascends in the liquid. Bubbles to which pollutants are attached become bubbles when they move to the gas phase region, and are pushed up by other bubbles that are newly generated one after another to further rise in the gas phase. Finally, this foam overflows from the discharge port 2a as shown in FIG.
That is, pollutants such as organic substances contained in the liquid stored in the open container 4 float in the liquid in a state of being attached to air bubbles generated by ejecting the gas-liquid mixed fluid from the diffuser 5b of the ejector 5. In the gas phase region, the bubbles are discharged from the bubbles to the outside of the open container 4 from the discharge port 2a.

Here, if a pipe (not shown) is connected to the discharge port 2a and the foam discharged to the outside of the open container 4 is transferred to a place other than the storage tank by this pipe, it is opened. The above-mentioned pollutants can be continuously removed from the liquid stored in the container 4. When the pollutant does not exist in the liquid stored in the open container 4, the bubbles do not change into bubbles even if they reach the gas-liquid interface. Therefore, until the bubbles are no longer generated, the gas-liquid mixed fluid is ejected from the diffuser 5b of the ejector 5 into the opening container 4, and the work of removing the bubbles overflowing from the discharge port 2a is continued. The above-mentioned pollutant can be separated from the liquid stored in the container 4 and almost completely removed.

When the lid 2 is removed, the inside of the container body 3 is exposed, so that the inside of the open container 4 can be easily cleaned, inspected, or repaired. Similar to 1a, it is also exhibited in the organic matter removing device according to the present invention. Further, in the organic matter removing device according to the present invention, since the flow rate of the water to be treated to be supplied to the ejector 5 is determined according to the discharge capacity of the liquid supply pump 10, the liquid supply having an appropriate discharge capacity suitable for the purpose is determined. Similarly, the effect of the gas dissolving device 1a that the water to be treated at a desired flow rate can be supplied to the ejector 5 by selecting the pump 10 is also exhibited.

FIG. 7 is a diagram showing a cross section of the gas melting device 1b according to the modified example of the gas melting device 1a of the first embodiment. The components shown in FIGS. 1 to 6 are designated by the same reference numerals and the description thereof will be omitted.
As shown in FIG. 7, in the gas melting device 1b of the first embodiment, the gas melting device 1b includes a nozzle 5a of the ejector 5, a reduced diameter portion 5c, a part of the diffuser 5b, a first self-priming tube 11, and a second self. The suction pipe 12 and the flow rate adjusting valve 13b are characterized in that they are installed outside the open container 4.
In the gas melting device 1b having such a structure, since the flow rate adjusting valve 13b is installed outside the open container 4, the flow rate adjusting valve 13b can be easily operated. Further, since most of the ejector 5 and the second self-priming pipe 12 are installed outside the open container 4 together with the first self-priming pipe 11, the ejector 5, the first self-priming pipe 11 and the second self-priming pipe are installed. 12 can be easily inspected and repaired.

FIG. 8 shows a cross section of the gas melting device according to the modified example of the gas melting device of the first embodiment, and is a diagram corresponding to FIG. 2 in the gas melting device of the first embodiment. 9 (a) is an external view of the water quality improver shown in FIG. 8, and FIGS. 9 (b) and 9 (c) are an arrow view in the E direction and FIG. 9 (a), respectively. It is a cross-sectional view taken along the line FF in b). FIG. 10 is an enlarged view of FIG. 9C, showing a state in which a part of the water quality improver is immersed in the liquid (water to be treated) stored in the open container.
In FIGS. 8, 9 (c) and 10, instead of displaying the cross section of the water quality improver, the pipe and the fixing screw, the appearance of each is displayed. Further, in FIGS. 9 (c) and 10 (c), the connecting tool located on the front side of the paper surface is shown by a broken line. Further, the components shown in FIGS. 1 to 6 are designated by the same reference numerals and the description thereof will be omitted.

As shown in FIG. 8, the gas melting device 1c has a structure in which the water quality improving device 15 is provided in place of the ejector 5 in the gas melting device 1a of the first embodiment.
As shown in FIGS. 9 (a) to 9 (c), the water quality improver 15 has a hollow portion formed so as to have substantially rotational symmetry and to reduce the diameter in both directions of the axis of rotational symmetry. The body 16, the liquid bubble generation container 17 with both ends open, the pipe 18 arranged coaxially with the axis of rotational symmetry of the body 16, and the plane view cross shape, respectively, at the ends of the four arms. A frame 19 having a screw insertion hole (not shown) and a pipe insertion hole 19a in the center is provided.

A connector 21 is attached to a liquid introduction hole 16a provided so as to open in the tangential direction on the peripheral wall portion of the body 16, and one of the rotational symmetry axes is attached to both ends of the reduced diameter portion of the body 16. A gas / liquid ejection hole 16b is provided so as to open in. Further, the liquid bubble generation container 17 is fixed to the outer peripheral wall of the body 16 so as to surround the gas / liquid ejection hole 16b, and one end of the pipe 18 is inserted into the liquid bubble generation container 17 to eject gas / liquid. It is installed near the hole 16b.
The frame 19 is fixed to four fixing seats 16c provided around the gas / liquid ejection hole 16b by using a fixing screw 20, and the pipe 18 is joined to the frame 19 in a state of being inserted into the pipe insertion hole 19a. ing. That is, the pipe 18 is fixed to the body 16 via the frame 19.
Further, on the side surface of the liquid bubble generation container 17, three treated water discharge ports 17a are located near the end on the side fixed to the body 16 in the circumferential direction of a virtual circle centered on the rotation center axis of the body 16. It is provided almost evenly.

The water quality improver 15 is installed inside the open container 4 so that the axis of rotational symmetry of the body 16 is parallel to the vertical direction, and is provided in the liquid introduction hole 16a (see FIG. 9C) of the body 16. The water supply pipe 8 is connected via the connector 21, and the first self-priming pipe 11 is connected to the upper end of the pipe 18 (see FIG. 8).
In the gas melting device 1c having such a structure, when the liquid supply pump 10 is operated with the flow rate adjusting valve 13c open, the water to be treated stored in the above-mentioned storage tank is pumped up through the suction pipe 9. After that, it is supplied to the water quality improver 15 from the liquid supply pipe 8 in a pressurized state. The water to be treated is supplied to the inside of the body 16 from the liquid introduction hole 16a in parallel with the tangential direction of the peripheral wall portion of the body 16, so that the inside of the body 16 is inside the body 16 as shown in FIG. A swirling flow W ₁ toward the upper end of the body 16 and a swirling flow W ₂ toward the lower end of the body 16 are generated. Then, due to the centripetal force generated by the two swirling flows W ₁ and W ₂ , a negative pressure gas axis X ₁ is formed inside the body 16 at the same position as the axis of rotational symmetry.

At this time, when the flow rate adjusting valve 13a is open, the lower end of the pipe 18 arranged coaxially with the axis of rotational symmetry of the body 16 is arranged in the vicinity of the gas / liquid ejection hole 16b, so that the upper end of the pipe 18 is provided. The oxygen gas in the oxygen cylinder is sucked into the first self-priming pipe 11 connected to. When the flow rate adjusting valve 13b is open, the oxygen gas staying near the gas-liquid interface is sucked into the second self-priming pipe 12. Then, the oxygen gas sucked into the first self-priming pipe 11 and the second self-priming pipe 12 is continuously supplied to the inside of the body 16 through the pipe 18.
Since the gas / liquid ejection hole 16b is close to the gas / liquid boundary surface, the oxygen gas supplied from the pipe 18 to the body 16 is discharged from the gas / liquid ejection hole 16b. Then, a large amount of liquid foam X ₂ is generated inside the liquid foam generation container 17 by the water to be treated ejected from the gas-liquid ejection hole 16b together with the oxygen gas while forming the swirling flow W ₁ .

_In the water quality improver 15, the water to be treated becomes a thin film on the surface of the liquid foam X2 in this way, so that the dissolution of oxygen gas is promoted, and the nitrogen gas is replaced with oxygen gas and expelled from the water to be treated. Is dissipated when the liquid bubble X ₂ bursts. In this way, the liquid in which the dissolved amount of oxygen gas has increased is discharged from the treated water discharge port 17a of the liquid bubble generation container 17 as shown by the arrow G.
In the water quality improving device 15, even if the gas / liquid ejection hole 16b is arranged in the gas phase, the pressure of the water to be treated supplied from the liquid introduction hole 16a to the device 16 is predetermined. When the pressure is higher than the pressure, oxygen gas is self-sucked from the upper part of the pipe 18, so that the above _- mentioned action that a large amount of liquid bubbles X2 is generated inside the liquid bubble generation container 17 is similarly exhibited.

Further, in the gas melting device 1c, the ratio of the gas supplied from the first self-priming pipe 11 and the second self-priming pipe 12 to the water quality improving device 15 is determined by the opening degree of the flow rate adjusting valves 13a and 13b. That is, in the gas melting device 1c, the ratio of the gas supplied from the first self-priming pipe 11 and the second self-priming pipe 12 to the water quality improving device 15 is adjusted by changing the opening degree of the flow rate adjusting valves 13a and 13b. It is possible to do. Then, since the flow rate of the gas supplied to the water quality improver 15 through the first self-priming pipe 11 is accurately grasped by the flow meter 14a, the opening degrees of the flow rate adjusting valves 13a and 13b are changed to change the opening degree of the first self. The ratio of the gas supplied from the suction pipe 11 and the second self-suction pipe 12 to the water quality improver 15 can be appropriately set. Therefore, according to the gas melting device 1c, the effect that the gas remaining inside the open container 4 without being melted can be efficiently taken into the second self-priming tube 12 is the same as in the case of the gas melting device 1a. It is demonstrated.
Further, a gas supply means such as a gas cylinder for supplying oxygen gas, carbon dioxide gas, or ozone gas is connected to the first self-priming pipe 11, the flow control valves 13a and 13b are opened, and the water supply pump 10 is operated. Then, when the water to be treated is supplied from the water supply pipe 8 to the water quality improver 15, the nitrogen gas replaced with the above gas and expelled from the water to be treated stays in the upper part of the open container 4, and is placed under the water to be treated. The gas that remains without being completely dissolved stays. Since the retained gas is sucked into the second self-priming pipe 12 and reused, the effect that the gas can be efficiently dissolved in the water to be treated is also a gas in the gas melting device 1c. It is exhibited in the same manner as in the case of the melting device 1a.

In the gas melting device 1c, the gas supply means connected to the first self-priming pipe 11 is removed to allow the first self-priming pipe 11 to communicate with the atmosphere, and the liquid supply pump is in a state where the flow rate adjusting valve 13b is closed. When 10 is operated, the water to be treated is supplied to the water quality improver 15 from the liquid supply pipe 8 in a pressurized state. As a result, the atmosphere is self _- sucked from the upper part of the pipe 18, and a large amount of liquid bubbles X2 is generated inside the liquid bubble generation container 17. Then, a part of the liquid foam X ₂ is discharged from the treated water discharge port 17a into the liquid (water to be treated) stored in the open container 4 to become bubbles.
In this case, the bubbles exert the effect of removing pollutants such as organic substances including waste products and excrement of aquatic organisms existing in the liquid. Therefore, the gas dissolving device 1c can also be used as an organic substance removing device in the same manner as the gas dissolving device 1a.

The gas melting device 1c may have a structure in which a gas / liquid ejection hole different from the gas / liquid ejection hole 16b is provided at the lower end of the body 16. In this case, in the vicinity of the gas-liquid ejection hole at the lower end of the body ₁₆ , the oxygen gas collected _on the gas axis X1 is sucked by the negative pressure of the gas axis X1 and tries to enter the inside of the body 16. As a result of being sheared by the treated water and the water to be treated that is ejected while forming the swirling flow W2, microbubbles _are generated. Then, the microbubbles are discharged into the liquid stored in the open container 4.
Since pollutants such as organic substances including waste products and excrement of aquatic organisms existing in the liquid easily adhere to the surface of the microbubbles, the microbubbles with the pollutants adhered rise in the liquid and become air. After changing to foam in the phase region, it finally overflows from the discharge port 2a. Therefore, in the gas dissolving device 1c having the above structure, the function of the organic substance removing device of removing the pollutant contained in the water to be treated is further exhibited.

The organic substance removing device according to the present invention is applicable to remove organic substances existing in the water to be treated, and the gas dissolving device according to the present invention is any one of oxygen gas, carbon dioxide gas and ozone gas in the water to be treated. It is applicable when dissolving the gas of.

1a, 1b ... Gas dissolving device 2 ... Lid 2a ... Discharge port 2b ... Flange 3 ... Container body 3a ... Discharge port 3b ... Flange 3c ... Bottom 3d ... Side surface 3e ... Liquid supply port 3f ... Air supply port 4 ... Open container 5 ... Ejector 5a ... Nozzle 5b ... Diffuser 5c ... Reduced diameter part 6 ... Overflow pipe 6a ... Open end 7a ... Bolt 7b ... Nut 8 ... Liquid supply pipe 9 ... Suction pipe 10 ... Liquid supply pump 11 ... First self-priming pipe 12 ... Second self-priming pipe 12a ... Suction port 13a-13c ... Flow control valve 14a ... Flow meter 14b ... Pressure gauge 15 ... Water quality improver 16 ... Instrument 16a ... Liquid introduction hole 16b ... Gas / liquid ejection hole 16c ... Fixed seat 17 ... Liquid foam generation container 17a ... Treated water discharge port 18 ... Pipe 19 ... Frame 19a ... Pipe insertion hole 20 ... Fixing screw 21 ... Connector

Claims (9)

An open container that stores liquid inside,
An ejector with a reduced diameter portion formed between the nozzle and the diffuser,
The treated water supply means that supplies the treated water with a pressure higher than the atmospheric pressure to this ejector,
A first self-priming tube, one end of which is connected to the reduced diameter portion and the other end of which communicates with the atmosphere.
A liquid amount adjusting means for discharging a desired amount of the liquid from the open container so that a liquid phase and a gas phase are formed inside the open container is provided.
The ejector is at least partially installed in the open container so that the outlet of the diffuser is arranged in the liquid phase.
An organic matter removing device characterized in that a discharge port is provided in the upper part of the open container so that the gas phase communicates with the atmosphere. The open container is
The container body in which at least a part of the ejector is installed inside, and
It consists of a lid that covers the top of the container body.
The organic substance removing device according to claim 1, wherein the lid body is provided with the discharge port and is detachably installed with respect to the container body. The water to be treated means is
A liquid supply pipe having one end connected to the nozzle and supplying the water to be treated to the ejector,
A liquid supply pump with the other end of this liquid supply pipe connected to the discharge port,
The organic substance removing device according to claim 1 or 2, comprising a suction pipe for supplying the water to be treated to the liquid supply pump. The organic matter removing device according to any one of claims 1 to 3.
A second self-priming tube that branches from the first self-priming tube and has a suction port arranged in the gas phase from the gas-liquid interface.
The gas supply means installed outside the open container and
The flow rate adjusting valve installed in the first self-priming pipe is provided.
A gas melting device characterized in that a gas supply means for supplying any one of oxygen gas, carbon dioxide gas, and ozone gas is connected to the other end of the first self-priming pipe instead of communicating with the atmosphere. .. The liquid amount adjusting means is
The drainage port provided at the bottom of the open container and
The open container is connected to the drain port at one end and the other end is located above the nozzle of the ejector and below the suction port of the second self-priming pipe. The gas melting apparatus according to claim 4, further comprising an overflow pipe installed outside the above. The gas dissolving apparatus according to claim 4 or 5, wherein the flow rate adjusting valve is a solenoid valve. The gas melting apparatus according to any one of claims 4 to 6, wherein a flow meter is installed in the first self-priming pipe. A water quality improver is provided instead of the ejector.
This water quality improver
An instrument that is substantially rotationally symmetric and has a hollow portion that is formed so as to reduce its diameter in both directions of the axis of rotational symmetry.
A liquid foam generation container with both ends open and a treated water discharge port on the side,
With a pipe arranged coaxially with the axis of rotational symmetry of the body,
In the body, a liquid introduction hole is provided in the peripheral wall portion so as to open in the tangential direction, and a gas-liquid ejection hole is provided in the end portion of the reduced diameter portion so as to open in one of the rotational symmetry axes.
The liquid bubble generation container is arranged above the body and is fixed to the outer peripheral wall of the body so as to surround the gas / liquid ejection hole.
One end of the pipe is installed in the vicinity of the gas / liquid ejection hole while being inserted into the liquid / foam generating container.
The water to be treated means introduces the water to be treated into the liquid introduction hole for the water quality improving device installed inside the open container so that the axis of rotational symmetry of the body is parallel to the vertical direction. Supply from
The organic matter removing device according to claim 1, wherein one end of the first self-priming pipe is connected to the pipe of the water quality improving device. The organic matter removing device according to claim 8 and
A second self-priming tube that branches from the first self-priming tube and has a suction port arranged in the gas phase from the gas-liquid interface.
The gas supply means installed outside the open container and
A flow rate adjusting valve installed in the first self-priming pipe is provided.
The other end of the first self-priming tube is connected to a gas supply means for supplying any gas of oxygen gas, carbon dioxide gas, or ozone gas instead of communicating with the atmosphere. Device.

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