JP4957946B2 - Gas dissolving device - Google Patents

Description

The present invention uses a gas, for example, carbon dioxide gas, oxygen gas, etc., to grow aquatic plants for water phase purification, for example, aquatic liquids such as water, for example, aquarium water for ornamental purposes, lake water, etc. lake water when accelerating, hot water for the production of bath carbonated water, microorganisms, liquid phase relates Ruga scan dissolution apparatus dissolved in (target fluid) such as a culture solution, such as cells.

Conventionally, as a general method for dissolving a gas in a liquid phase , for example, a method of jetting a gas directly into a liquid phase, a method of using this together with stirring, and the like can be mentioned. Is exhausted into the atmosphere, so gas is wasted.
As an efficient gas dissolution method than the method, a method of dissolving a gas into a liquid phase through the gas permeable membrane, for example, (a kind of gas permeable membrane) silicone tube closed end and part gas A method is known in which a sealed container or the like having a permeable membrane is disposed in a liquid phase and pressurized gas is fed into the inside (for example, see Patent Document 1).
JP 2000-334488 A

However, such the conventional Ruga scan dissolution method using a gas permeable membrane, while that of the pressurized gas dissolved in a long period of time the liquid phase was fed in a continuous, pressurized in contact with the gas permeable membrane The drain gradually accumulates in the pressurized gas reservoir space on the gas side, and this accumulated drain blocks the supply of the pressurized gas or blocks a part of the gas permeable membrane to enter the liquid phase. hinder gas permeation, As a result, there is a problem that the amount of dissolved gas in the liquid phase is gradually progressively reduced.

The present invention was made in view of the problems of the prior art has, and has an object, in Ruga scan dissolution apparatus using a gas permeable membrane, the gas in the liquid phase a long period of time and to provide a Ruga scan dissolving device can Rukoto is stably dissolved in succession.

As a result of diligent investigations to achieve the above object, the present inventor has found that the internal pressure of the pressurized gas reservoir space increases as the gas permeation of the gas permeable membrane by the drain accumulated in the pressurized gas reservoir space increases. As the pressure rises gradually, and when the internal pressure exceeds a certain value, the drain is automatically discharged out of the pressurized gas reservoir space so as to eliminate the hindrance of gas permeation of the gas permeable membrane by the drain. if, the obtained new findings of the can Rukoto is stably dissolved continuously for long periods of time the gas in the liquid phase, thereby completing the present invention based on these findings.

That is, gas dissolution apparatus of the present invention includes a pressurized gas supply source, a means for dissolving the gas into the liquid phase through the gas permeable membrane, the gas permeable membrane is liquid on one side thereof A pressurized gas reservoir space is provided on the pressurized gas side in contact with the other side of the gas permeable membrane, and the pressurized gas supply source is provided in a part of the pressurized gas reservoir space. communicates with, and in gas dissolution apparatus equipped with a gas dissolving means having an opening and closing valve for discharging the drain accumulated in another portion of the pressurized gas space,
A pressure detection mechanism for detecting the internal pressure of the pressurized gas reservoir space and a valve opening / closing control mechanism for opening the on / off valve when the internal pressure detected by the pressure detection mechanism exceeds a preset pressure value It is characterized by.

Moreover, a preferred embodiment of the gas dissolution apparatus of the present invention, the on-off valve is characterized in that it is a safety valve having the functions of both the pressure detection mechanism and the valve opening and closing control mechanism.

Further, another preferred embodiment of the gas dissolution apparatus of the present invention, with respect to 1 of the pressurized gas supply source, that a plurality of said gas dissolution device comprising communicating in parallel with said source of pressurized gas Characterize

According to the present invention, in Ruga scan dissolution apparatus using a gas permeable membrane, the internal pressure of the pressurized gas reservoir space of pressurized gas side of the gas permeable membrane in the gas dissolving means is preset to rise When the pressure value is exceeded, the on-off valve is automatically opened, and the drain accumulated in the pressurized gas reservoir space is discharged out of the gas reservoir space. due to so as to eliminate, it is Rukoto continuously for long periods of time by stably dissolved gas in the liquid phase.

It will be described in detail below gas dissolution apparatus of the present invention.

Gas dissolution apparatus of the present invention, breeding and growth of organisms in a water bath, or watch or the like, or to promote the growth of aquatic plants for water purification in lakes, etc., to produce a bath carbonated water bath effects are expected or, furthermore, is used as a liquid phase system in order to dissolve the gas in the (target fluid) such as water during such or culturing a microorganism or cell

Examples of the gas of the pressurized gas supply source include, but are not limited to, carbon dioxide gas, oxygen gas, and air.
Moreover, as a pressurized gas source (pressurized gas storage means or the like) in the pressurized gas supply source, for example, a gas cylinder, a compressor, or the like is usually preferably used.
Further, as this pressurized gas supply source, a gas pressure adjusting means such as a pressure reducing valve or a pressure regulating valve, a pressure gauge, a gas flow rate adjusting means such as a gas flow rate adjusting valve ( For example, various means such as an orifice, a needle valve, etc.) and a gas flow meter (for example, an area type flow meter, a mass flow controller, etc.) can be provided as necessary. By doing so, the gas supply pressure is set to a constant pressure, the gas flow rate is adjusted, etc., so that the gas pressure and gas flow rate suitable for the gas film (gas permeable membrane) permeation in the gas dissolving means are appropriately set. Adjusted.
A part of the pressurized gas reservoir space in the gas dissolving means in contact with the liquid phase is connected downstream of the pressurized gas supply source. The connection position of the pressurized gas reservoir space with the pressurized gas supply source is specifically the case where the gas dissolving means is disposed horizontally in the liquid phase, and the mode of the gas dissolving means described later. In the case of Example (1) or (3), at one end (upstream end), in the case of Embodiment (2), at an appropriate part, and the gas dissolving means is arranged perpendicular to the liquid phase. In some cases, it is preferable to use the upper end portion in any of the embodiments (1) to (3).

  As described above, the gas dissolving means for dissolving the gas in the liquid phase through the gas permeable membrane continuously permeates the membrane while storing the pressurized gas on the pressurized gas side in contact with the gas permeable membrane. An open / close valve for discharging a drain gradually accumulated in the pressurized gas reservoir space. Have.

The embodiment of the gas dissolving means is not particularly limited as long as it can efficiently dissolve the gas in the liquid phase, and the following are exemplified (FIGS. 1A to 1C). (Refer to the schematic explanatory diagram).
The on-off valve is omitted here and will be described later.
(1) As shown in FIG. 1 (a), the liquid phase L is applied to one side (outer side or inner side) of the tubular (tube-like) gas permeable membrane 1a, and the other side (inner side or outer side) is applied. A structure in which the pressurized gas in the pressurized gas reservoir space 2a is in contact (G is a pressurized gas, the same shall apply hereinafter) (the figure shows the liquid phase L outside the gas permeable membrane 1a, Example when pressurized gas is in contact with the inside).
(2) As shown in FIG. 1B, the liquid phase L is on one side of the flat membrane-like gas permeable membrane 1b, and the pressurized gas in the pressurized gas reservoir space 2b is on the other side. What is configured to touch.
(3) As shown in FIG. 1 (c), a plurality of hollow fiber membranes that are gas permeable membranes 1c are aggregates that are fixed with a potting material p while maintaining the open ends thereof and the end portions thereof. Has a common opening space portion 2c ′ (this common opening space portion also functions as a pressurized gas reservoir space portion), and in the same manner as in the above-described embodiment (1), the gas permeable membrane 1c. The liquid phase L is in contact with one side (outside or inside), and the pressurized gas in the pressurized gas reservoir space 2c is in contact with the other side (inside or outside) (this set) The arrangement of the hollow fiber membranes in the horizontal cross section in the axial direction of the body is not particularly limited, but is preferably a substantially circular shape.) (The figure shows the liquid phase L outside the gas permeable membrane 1c and the pressurized gas inside. An example of the case of contact.) etc

In embodiments (1) and (3) of the gas dissolving means, the inside of the tubular or hollow fiber membrane (a kind of tubular) gas permeable membrane is the pressurized gas reservoir space (the outside is the liquid phase). ), The gas permeable membrane itself may have pressure resistance against the pressurized gas to be fed, but the opposite outer side is the pressurized gas reservoir space (the inner side is the liquid In the case of a phase), a pressure-resistant pressurized gas reservoir space is formed by a housing member or the like.
In addition, the said example (3) is well-known as a gas dissolution module, and the external perfusion-type liquid flow method (a liquid phase is outside a hollow fiber membrane, a pressurized gas is inside) or an internal perfusion-type liquid flow method (hollow fiber) There is a liquid phase inside the membrane and a pressurized gas outside).
Further, in the above-described embodiment (2), the flat membrane-like gas permeable membrane itself has a pressure resistance, or a material provided with a pressure resistance with a reinforcing material such as a synthetic resin of a rigid material or a metal. Further, the pressurized gas reservoir space is formed so as to have pressure resistance by a housing member or the like except for the gas permeable membrane.
Further, as described above, the gas permeable membrane in the gas dissolving means may be the entire surface in contact with the liquid phase (the above embodiment examples (1) and (3)) or a part (the above embodiment example (2). )).

The material of the gas permeable membrane is not particularly limited as long as it allows gas to permeate but does not permeate a liquid phase such as water. Examples thereof include silicon rubber, segmented polyurethane, styrene thermoplastic elastomer and polyolefin. And polymer blends.
The gas permeable membrane is preferably a non-porous membrane that is gradually hydrophilized by long-term use and has no risk of reverse water permeation.
In addition, the inner diameter, length, etc. of the tubular gas permeable membrane, the area of the flat gas permeable membrane, the inner diameter, number, length, etc. of the hollow fiber membrane are the liquid phase amount, required dissolved gas concentration, What is necessary is just to select and determine suitably, considering the dissolved gas consumption etc. comprehensively.

As for the attachment of the open / close valve to another part of the pressurized gas reservoir space, a portion on the opposite side of the connecting portion with the pressurized gas supply source, which is a position where the accumulated drain can be effectively discharged, is suitable. It is. For example, in the case where the gas dissolving means is arranged horizontally in the liquid phase, in the case of the above-described embodiments (1) and (3), the end of the pressurized gas reservoir space is formed at the end of the above-described embodiment (2). In some cases, in the case where the gas dissolving means is arranged perpendicularly to the liquid phase in the portion of the pressurized gas reservoir space opposite to the connecting portion with the pressurized gas supply source, the embodiment (1) It is preferable to attach to the lower end part in any case of (3).
Moreover, as said on-off valve, generally a solenoid valve etc. of energization opening etc. are mentioned as a suitable example generally, for example.

  Next, according to the present invention, as described above, in the gas dissolving means, as the hindrance of gas permeation of the gas permeable membrane by the drain accumulated in the pressurized gas reservoir space increases, the internal pressure of the pressurized gas reservoir space is increased. Is based on the new knowledge of the present inventor that the temperature gradually rises, and the most characteristic point is that the drain is controlled by using the internal pressure value rising in the pressurized gas reservoir space as an index. The on-off valve automatically discharges the pressurized gas reservoir space to eliminate the gas permeation of the gas permeable membrane by the drain.

The increase in the internal pressure of the pressurized gas reservoir space is due to the accumulated drain blocking the gas permeable membrane and hindering gas permeation, and this rise is due to the generation of drain (gas permeability from the liquid phase). When water vapor (gas) enters (permeates) the pressurized gas reservoir space through the membrane, the water vapor condenses due to a decrease in temperature and becomes a drain.) It depends on the method.
That is, when the drain that has been generated and accumulated immediately closes the gas permeable membrane, the internal pressure begins to gradually increase from that time, and the generated drain enters the space outside the gas permeable membrane. In the case where the gas permeable membrane is blocked first, and then the gas permeable membrane is blocked, the internal pressure starts to gradually increase when the gas permeable membrane is blocked.
As an example of the former, the case of the horizontally arranged dissolving means (FIG. 1 (a)) of the above-described example (1) of the dissolving means can be mentioned, and as an example of the latter, the horizontal means of the embodiment (2). In the case of the dissolving means arranged (FIG. 1 (b)) and the dissolving means arranged vertically in the embodiment (3) (FIG. 1 (c)) (the generated drains are respectively pressurized gas reservoir spaces 2b). , First accumulated in the lower common opening space 2c ′, and thereafter, the gas permeable membranes 1b and 1c are blocked).

As described above, the opening and closing of the on-off valve in the gas dissolving means includes a pressure detection mechanism for detecting the internal pressure of the pressurized gas reservoir space, and the valve when the internal pressure detected thereby exceeds a set pressure value. The drain which is controlled by the valve opening / closing control mechanism to be opened and gradually accumulates in the pressurized gas reservoir space is automatically discharged out of the pressurized gas reservoir space by both mechanisms.
In addition, when the internal pressure of the pressurized gas reservoir space falls below a set pressure value due to the discharge of the drain, the valve open / close control mechanism is controlled so that the open / close valve is closed. Dissolution of the gas through the membrane continues.
With the above-described configuration, the drain accumulated in the pressurized gas reservoir space is effectively and automatically discharged outside the pressurized gas reservoir space while preventing gas from being wasted. due to so as to eliminate the obstacle to the gas permeable sex film can Rukoto is stably dissolved continuously for long periods of time the gas in the liquid phase.

The pressure detection mechanism is attached to a gas supply path near the upstream of the gas dissolving means or an appropriate position of the gas dissolving means.
The pressure detection mechanism is not particularly limited and a normal one can be used effectively. For example, a semiconductor pressure sensor (such as one that converts pressure into voltage) can be cited as a suitable example.
In addition, as the valve opening / closing control mechanism, if the detected internal pressure of the pressurized gas reservoir space exceeds a preset pressure value, the valve is opened (normally closed). There is no particular limitation, and ordinary ones can be used effectively.

As a method of discharging the drain accumulated in the pressurized gas reservoir space, a method of opening the on-off valve at regular intervals using a timer is also conceivable.
However, in this timer setting method, the generation rate of the drain, the generation amount, etc. accumulated due to fluctuations due to various factors such as the gas permeability of the gas permeable membrane, the temperature of the liquid phase, the gas pressure to be delivered, etc. It is difficult to set an appropriate timer for discharging the drain, and therefore, it is easy to set a short time, which leads to wasted supply gas.

Further, the gas dissolution apparatus of the present invention, as the on-off valve, it is preferable to use a safety valve having the functions of both the pressure detection mechanism and the valve opening and closing control mechanism.
By using a safety valve that can set various open pressure values, a valve that is set to a constant open pressure value, etc., when the internal pressure of the pressurized gas reservoir space exceeds this set pressure value, the valve opens. The drain is automatically discharged by the pressurized gas, and when the internal pressure of the pressurized gas reservoir space falls below the set pressure value, the valve is returned to the closed state (not all drains are discharged). No.) Again, efficient gas dissolution continues.
This form of gas dissolution apparatus of the present invention, the terminal portion of the pressurized gas reservoir space, the lower end or the like, merely an extremely simple structure of attaching a safety valve in a position accumulated drain can be effectively discharged, moreover a it shall not stably dissolved by extended periods of time the gas in the liquid phase, is suitable.

Further, another preferred embodiment of the gas dissolution apparatus of the present invention are those for one of the pressurized gas supply source, and connected by communication to parallel a plurality of said gas dissolving means to the pressurized gas source It is.
In this embodiment, a gas flow rate adjusting valve can be provided upstream of the plurality of gas dissolving means connected in parallel.
Further, when the valves of the plurality of gas dissolving means are opened and closed by the pressure detecting mechanism and the valve opening / closing control mechanism, the pressure detecting mechanism and the valve opening / closing control mechanism are provided for each gas dissolving means.
The number of sets of the gas dissolving means is appropriately selected and determined by comprehensively considering the liquid phase amount, the necessary dissolved gas concentration, the dissolved gas consumption amount, and the like.
Since the above-described configuration, structure on is simple, it is Rukoto gas efficiently continuously for long periods of time by stably dissolved in the liquid phase of the high-capacity.

  Hereinafter, the present invention will be described in more detail by way of some examples with reference to the drawings, but the present invention is not limited to these examples.

Example 1
Figure 2 is a schematic explanatory view showing an embodiment of a gas dissolution apparatus of the present invention.
Gas dissolution apparatus shown in the figure, downstream pressure regulating valve 12 of the gas cylinder 11 is a pressurized gas source, a pressure gauge 13, are connected in a sequential communication with the gas flow rate control valve 14 and the gas flow meter 15 pressure A pressurized gas supply source 16 and a tubular gas dissolving means 4 (an example shown in FIG. 1A) having one end (tip portion) connected in a communicating state downstream of the pressurized gas supply source 16 are provided. ing.
The gas dissolving means 4 includes a tubular gas permeable membrane 1a (for example, a silicone rubber tube) whose outer side is in contact with a liquid phase (target liquid), a pressurized gas reservoir space 2a in a hollow portion thereof, and the like. It has the solenoid valve 3 which is the on-off valve for drain discharge connected with the end (terminal part) in communication.
Pressure The gas dissolution apparatus this is further provided at a position near the tip of the gas dissolution device 4, the pressure detection mechanism 10 for detecting the internal pressure of the pressurized gas reservoir space 2a, that is the detection Is provided with a valve opening / closing control mechanism 20 that opens the electromagnetic valve (normally closed) 3 when the pressure value exceeds a preset pressure value.
Note that the pressure and flow rate of the gas can be adjusted only by the pressure regulating valve 12 by appropriately omitting the attachment of the gas flow rate adjusting valve 14 and the gas flow meter 15 as the pressurized gas supply source 16.

Next, a method using a gas dissolution apparatus of the present embodiment.
First, the gas dissolving means 4 (inner diameter 3 mm, silicone tubing length 1m) is arranged horizontally in the liquid phase (water tank 60L) in gas dissolution device, regulating the pressure and flow rate of the gas cylinder 11 (carbon dioxide) The pressure gas is appropriately adjusted by the pressure valve 12, the gas flow rate control valve 14, etc. (gas pressure 20 kPa, gas flow rate 5 ml / min), and the pressurized gas is fed to the pressurized gas reservoir space 2a of the hollow portion (pressurized gas feed) At the start, the internal pressure of the pressurized gas reservoir space 2a is low, but reaches 5 kPa at equilibrium.) The supplied pressurized gas permeates through the gas permeable membrane 1a forming the pressurized gas reservoir space 2a and is gradually dissolved in the liquid phase.
Note that the internal pressure of the pressurized gas reservoir space 2a at the start of the pressurized gas supply is the pressure adjusted by the pressure regulating valve 12 because there is no generation of drain and gas permeation through the gas permeable membrane 1a is good. Lower than.

As the pressurized gas feed time elapses, the drain gradually accumulates in the pressurized gas reservoir space 2a, and as the hindrance to gas permeation of the gas permeable membrane 1a increases, The internal pressure rises (24 hours after the start of feeding pressurized gas, internal pressure 10 kPa).
When the internal pressure of the pressurized gas reservoir space 2a detected by the pressure detection mechanism 10 exceeds a preset pressure value (10 kPa), the solenoid valve 3 is energized and the drain is pressurized by the valve opening / closing control mechanism 20. When the internal pressure of the pressurized gas reservoir space 2a falls below the set pressure value in a short time, the solenoid valve 3 is opened by the valve opening / closing control mechanism 20 when the gas is automatically discharged together with some gas to the outside of the gas reservoir space 2a. It is closed and the efficient dissolution of the gas is continued again.
According to gas dissolution apparatus of the present embodiment, it is Rukoto is stably dissolved continuously for long periods of time the gas in the liquid phase.

(Example 2)
Figure 3 is a schematic explanatory view showing another embodiment of a gas dissolution apparatus of the present invention.
In the following embodiments, members and locations that are substantially the same as those in the first embodiment are given the same reference numerals, and descriptions thereof are omitted.
Gas dissolution apparatus shown in the figure, the electromagnetic valve 3, the safety valve 3 'is provided as an opening and closing valve simply end the pressurized gas reservoir space 2a in place of the pressure detection mechanism 10 and the valve opening and closing control mechanism 20 except that there have gas dissolution apparatus similar to the configuration shown in FIG.
Then, the safety valve 3 ′ detects the internal pressure of the pressurized gas reservoir space 2a in FIG. 2 and the detected internal pressure exceeds a preset pressure value (operating pressure) (10 kPa). It has both functions of the valve opening / closing mechanism 20 that opens the valve of the opening / closing valve.
Note that 4 ′ is a gas dissolving means.

By using the gas dissolution apparatus of the present embodiment, in substantially the same manner as described in Example 1, the drain accumulated in the pressurized gas reservoir space portion 2a is, the operation of the safety valve 3 '(the valve is opened ) Is automatically discharged out of the pressurized gas reservoir space 2a, and then the safety valve 3 'is returned to the closed state in a short time, and the efficient dissolution of the gas is continued again. At this time, only the drain may be discharged or a slight amount of pressurized gas may be discharged after the drain is discharged. These are the operating pressure of the safety valve 3 ', the gas flow rate, the gas of the gas permeable membrane. It is affected by transmission speed.
Then, according to the gas dissolution apparatus of the present embodiment, an extremely simple structure, moreover, it is Rukoto is stably dissolved by long term continuous gas in the same manner the liquid phase to that described in Example 1 There is an effect.

(Example 3)
Figure 4 is a schematic explanatory view showing still another embodiment of the gas dissolution apparatus of the present invention.
Gas dissolution apparatus shown in the figure, with respect to 1 of the pressurized gas supply source 16, gas pressurized gas reservoir in the scan melter space 2a and the safety valve 3 connected to the distal end thereof as shown in FIG. 3 ' A plurality of gas dissolving means 4 ′ are connected and arranged in parallel in downstream from the pressurized gas supply source 16.
The drain accumulated in each pressurized gas reservoir space 2a is automatically discharged from the safety valve 3 'to the outside of each pressurized gas reservoir space 2a in the same manner as described in the second embodiment. Thereafter, the safety valve 3 ′ returns to the closed state in a short time, and the efficient dissolution of the gas is continued again.
A gas flow rate control valve can be provided upstream of each of the plurality of gas dissolving means 4 ′.
Then, according to the gas dissolution apparatus of the present embodiment, on the structure is simple, the gas efficiently in the first pressurized gas supply source 16 to the liquid phase of the high-capacity and long time continuous It was stably dissolved Te can Rukoto.

Example 4
Figure 5 is a schematic sectional view showing a stand of the gas dissolving module include aspects of the gas dissolving means a hollow fiber membrane and the gas permeable membrane (external perfusion type flow-through method) in gas dissolution apparatus of the present invention .
In the gas melting module shown in the figure, the embodiment shown in FIG. 1C is incorporated as gas dissolving means 4 ″, and a safety valve 3 is provided at the lower end of the common opening space 2c ′ below the gas melting means 4 ″. 'Is installed.
The pressurized gas G is fed from the upper common opening space 2c ′ to the pressurized gas reservoir space 2c, which is the hollow portion of the gas permeable membrane (hollow fiber membrane) 1c, while the liquid phase (target) The liquid (L) flows out of the gas permeable membrane 1c from the lower inlet and flows out from the upper outlet.

The drain accumulated in the pressurized gas reservoir space 2c and that 2c ′ below the common opening space functioning as the pressurized gas reservoir space is lower than the safety valve 3 ′ in the same manner as described in the second embodiment. It is automatically discharged out of the common opening space 2c ′, and then the safety valve 3 ′ returns to the closed state in a short time, and the efficient dissolution of the gas is continued again.
The use of gas dissolving module incorporating a gas dissolving means 4 '' in the gas dissolution apparatus of the present invention, more of the gas into the liquid phase L to increase significantly the contact area between the gas permeable membrane 1c and a liquid phase L It enables efficient lysis, moreover, it is Rukoto is stably dissolved continuously for long periods of time the gas in the liquid phase.

Is a schematic diagram illustrating an embodiment of a gas dissolving means in gas dissolution apparatus of the present invention. Is a schematic explanatory view showing an embodiment of a gas dissolution apparatus of the present invention. Is a schematic explanatory view showing another embodiment of a gas dissolution apparatus of the present invention. Is a schematic explanatory view showing still another embodiment of the gas dissolution apparatus of the present invention. Is a schematic sectional view showing a gas dissolving module comprises a gas dissolving means in gas dissolution apparatus of the present invention.

Explanation of symbols

1a, 1b, 1c Gas permeable membranes 2a, 2b, 2c Pressurized gas reservoir space 2c ′ Common opening space 3 Electromagnetic valve 3 ′ Safety valve 4, 4 ′, 4 ″ Gas dissolving means 10 Pressure detection mechanism 11 Pressurized gas Source 12 Pressure regulating valve 14 Gas flow control valve 16 Pressurized gas supply source 20 Valve open / close control mechanism

Claims (3)

A pressurized gas supply source;
A means for dissolving the gas in a liquid phase through a gas permeable membrane, wherein the gas permeable membrane is in contact with the liquid phase on one side thereof, and in contact with the other side of the permeable membrane. There is a pressurized gas reservoir space on the gas side, communicated with the pressurized gas supply source at a part of the pressurized gas reservoir space, and another part of the pressurized gas reservoir space in gas dissolution apparatus equipped with a gas dissolving means having an opening and closing valve for discharging the drain accumulated is
A pressure detection mechanism for detecting the internal pressure of the pressurized gas reservoir space and a valve opening / closing control mechanism for opening the on / off valve when the internal pressure detected by the pressure detection mechanism exceeds a preset pressure value features and to Ruga scan dissolution apparatus. Said off valve gas dissolution apparatus according to claim 1, characterized in that the safety valve having the functions of both the pressure detection mechanism and the valve opening and closing control mechanism. For one of said pressurized gas supply source, a plurality of gas dissolving apparatus according to claim 1 or 2, characterized in that communicating in parallel with the pressurized gas supply source of the gas dissolving means.

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