WO2015111592A1

WO2015111592A1 - Closed circulation filtration aquaculture system

Info

Publication number: WO2015111592A1
Application number: PCT/JP2015/051453
Authority: WO
Inventors: 最上賢一; 伏見浩
Original assignee: 株式会社Ｍｇグローアップ; 丸福水産株式会社; Ｉｃｒａｓ株式会社
Priority date: 2014-01-24
Filing date: 2015-01-21
Publication date: 2015-07-30
Also published as: JP2018011607A; JPWO2015111592A1; JP6218339B2; JP6353147B2

Abstract

　To provide a closed circulation filtration aquaculture system capable of feeding sufficient oxygen gas required for nitrification in a biological filtration device. A closed circulation filtration aquaculture system in which a breeding tank for breeding fish and shellfish and a biological filtration device for biologically filtering breeding water discharged from the breeding tank are provided on a circulation channel equipped with a circulation pump and provided to circulate breeding water; wherein a gas-liquid mixed water generation device for mixing oxygen gas in the form of nanolevel bubbles into the breeding water and thereby generating a gas-liquid mixed water is provided on a portion of the circulation channel positioned downstream of the breeding tank and upstream of the biological filtration device, oxygen gas is caused to be dissolved in a supersaturated state in the gas-liquid mixed water generated in the gas-liquid mixed water generation device and fed to the biological filtration device, and oxygen gas is also caused to be dissolved in a supersaturated state in the gas-liquid mixed water fed to the breeding tank after being biologically filtered in the biological filtration device.

Description

Closed circulation filtration aquaculture system

The present invention relates to a closed circulation filtration aquaculture system, and more specifically, a gas-liquid mixed water generating apparatus that generates gas-liquid mixed water by forming oxygen gas into bubbles of nano-level (outer diameter is 1 μm or less) and mixing it with breeding water Relates to a closed circulation filtration aquaculture system.

Conventionally, there is one disclosed in Patent Document 1 as one form of a closed circulation filtration aquaculture system. That is, Patent Document 1 collects a seafood rearing tank, a sedimentation tank that collects feces and residual food of seafood in the rearing water, and a suspended suspension in the rearing water that is not collected by the sedimentation tank. A filter device, a biofilter (biological filtration tank) that oxidizes ammonia in breeding water to nitric acid, a denitrification tank that releases nitric acid accumulated in the breeding water to nitrogen gas into the air by this oxidation action, and sterilization of breeding water Branched and branched the ultraviolet irradiation device for the water, the oxygen infuser that dissolves the required amount of oxygen gas in the breeding water, and the circulation path for supplying the breeding water from the oxygen welder to the breeding tank A seafood aquaculture device is disclosed that is configured by sequentially connecting and providing a heat pump for controlling the breeding water temperature provided in one of the circulation paths.

JP 2000-31542 A

However, the seafood aquaculture device disclosed in Patent Document 1 has a problem that oxygen gas necessary for nitrification in a biological filtration tank cannot be sufficiently supplied.

Therefore, an object of the present invention is to provide a closed circulation filtration aquaculture system that can sufficiently supply oxygen gas necessary for nitrification in a biological filtration apparatus.

The invention described in claim 1 includes a breeding water tank for breeding fish and shellfish in a circulation flow path that circulates breeding water with a circulation pump, and a biological filtration device that performs biological filtration treatment of the breeding water discharged from the breeding water tank. A closed circulation filtration aquaculture system,
Gas-liquid mixing that produces gas-liquid mixed water by mixing oxygen gas with nano-sized bubbles in the circulation channel located downstream of the breeding tank and upstream of the biological filtration device. A water generator is installed,
The gas-liquid mixed water generated by the gas-liquid mixed water generating device and supplied to the biological filtration device is dissolved in supersaturated oxygen gas, and is biologically filtered by the biological filtration device and then supplied to the breeding aquarium. The gas-liquid mixed water is also characterized in that oxygen gas is dissolved in a supersaturated state.

In the first aspect of the invention, gas-liquid mixed water in which oxygen gas is dissolved in a supersaturated state is generated by the gas-liquid mixed water generating device, and the gas-liquid mixed water is supplied to the biological filtration device. Therefore, the oxygen gas necessary for nitrification in the biological filtration device can be sufficiently supplied. At this time, since the oxygen gas is in the form of nano-level bubbles, the oxygen gas stays for a long time in the biological filtration device with almost no floating, and is dissolved and diffused from the bubbles into the gas-liquid mixed water. Therefore, it is not necessary to treat the breeding water that has been subjected to biological filtration separately with an oxygen dissolving device to increase the dissolved oxygen content (DO value) of the breeding water. That is, an oxygen dissolving device is not necessary. Therefore, the cost can be reduced accordingly.

Invention of Claim 2 is invention of Claim 1, Comprising: The physical filtration apparatus is arrange | positioned in the part of the circulation flow path located in the immediately upstream of a gas-liquid mixed water production | generation apparatus, It is characterized by the above-mentioned. And

In the invention described in claim 2, since the breeding water filtered by the physical filtration device is mixed with the oxygen gas that has become nano-level bubbles by the gas-liquid mixed water generation device, No decrease in pH, which is an indicator of carbon dioxide accumulated in breeding water. Therefore, there is no need to provide a deaeration device for removing carbon dioxide gas. Here, the reason for removing the carbon dioxide gas is that the breeding fish discharges carbon dioxide by respiration, and when the concentration increases, the pH of the breeding water decreases, the growth of the breeding fish slows down, and the like. Therefore, the cost can be reduced because there is no need to provide a deaeration device.

Invention of Claim 3 is invention of

Claim

1 or 2, Comprising: The air supply apparatus which pumps air to a breeding aquarium and the biological filtration apparatus which used the immersion filter medium as a culture medium of nitrifying bacteria, respectively is connected It is characterized by that.

In the invention described in claim 3, the breeding water can be circulated in the breeding aquarium by pumping air into the breeding aquarium with the air supply device. As a result, the environment for raising seafood can be improved. Moreover, nitrifying bacteria can be activated by pressure-feeding air to the biological filtration device by the air supply device. As a result, the nitrification effect can be enhanced.

According to the present invention, it is possible to provide a closed circulation filtration aquaculture system that can sufficiently supply oxygen gas necessary for nitrification in a biological filtration apparatus.

The block schematic diagram of a closed circulation filtration culture system. The structure schematic of the gas-liquid mixed water production | generation apparatus which concerns on 1st Embodiment. Front side perspective explanatory drawing of the gas-liquid mixing apparatus which a gas-liquid mixed water production | generation apparatus comprises. Cross-sectional right side explanatory drawing of a gas-liquid mixing apparatus. II sectional view explanatory drawing of FIG. II-II sectional view explanatory drawing of FIG. Cross-sectional side explanatory drawing of the gas-liquid mixing means as 1st Embodiment. Sectional plane explanatory drawing (a), partial expansion explanatory drawing (b) of the gas-liquid mixing means as 1st Embodiment, and the III-III sectional view explanatory drawing (c) of (b). The top view (a), side view (b), and bottom view (c) of a gas-liquid supply path formation case. Sectional side view (a) and bottom view (b) of mixed gas / liquid outlet passage forming case. Front explanatory drawing (a) of a 1st element, IV-IV sectional view (b) of (a), and back view (c). Front explanatory drawing (a) of a 2nd element, the VV sectional view (b) of (a), and a rear view (c). Front explanatory drawing of a mixing unit. The conceptual explanatory drawing of the gas-liquid mixed water production | generation apparatus which concerns on 2nd Embodiment. The perspective explanatory drawing of the fluid mixing means as 2nd Embodiment. FIG. 16 is a sectional view taken along line VI-VI in FIG. 15. VII-VII sectional view explanatory drawing of FIG. Expansive plane explanatory drawing (a) and a cross-sectional enlarged side explanatory drawing (b) of a mixing unit.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. That is, Sy shown in FIG. 1 is a closed circulation filtration aquaculture system according to this embodiment. The closed circulation filtration aquaculture system Sy (hereinafter abbreviated as “aquaculture system Sy”) replenishes only the amount of breeding water lost due to evaporation and management work, so the same amount of breeding water per day. Although it is a wide concept including even water injection (replacement), in the aquaculture system Sy of this embodiment, aquaculture is performed only by replenishing the loss of breeding water due to evaporation and management work.

[Description of configuration of aquaculture system]
As shown in FIG. 1, the aquaculture system Sy includes a breeding water tank Fa, a sedimentation tank Dp, a physical filtration device Pf, and a gas-liquid mixed water generation device (hereinafter, abbreviated as “generation device”). .) A, the biological filtration device Bf, the temperature control device Ta, and the circulation pump Pc are arranged in this order.

The circulation channel C forms a closed annular channel and circulates a gas-liquid mixed water Rm, which will be described later, mixed with breeding water and oxygen gas by the circulation pump Pc.

The rearing water tank Fa is a water tank formed by stretching a waterproof sheet such as a plastic sheet in a box shape with an upper surface opening for rearing or aquaculture of seafood, and flows in from the upstream side of the circulation channel C. The breeding water or the gas-liquid mixed water Rm is stored and a part of the breeding water flows out to the downstream side of the circulation channel C. D1 is a first drainage channel, and it is possible to discharge feces, residual food, drainage, etc. of seafood when the bottom of the rearing tank Fa is cleaned through the first drainage channel D1 to a predetermined location outside the system.

The settling tank Dp introduces breeding water or gas-liquid mixed water Rm flowing out from the breeding tank Fa, and sinks and collects fish dung and residual feed having a larger specific gravity than the breeding water or gas-liquid mixed water Rm. In addition, the treated water from which the remaining bait is collected and separated is caused to flow out downstream of the circulation channel C.

The physical filtration device Pf filters the treated water that has flowed out of the precipitation tank Dp. The physical filtration device Pf is made of a plastic net or a screen-like material such as a porous body, a metal net, or a glass filter, and can be backwashed with backwashing water to prevent clogging. In the backwash water, treated water is recycled and reused. Cleaning of the screen is performed by constantly spraying the cleaning water intermittently at a speed higher than the flow rate of the treated water. The screen in the physical filtration device Pf is replaceable. D2 is a second drainage channel, and the physical filtered product can be discharged to a predetermined location outside the system through the second drainage channel D2.

The generation device A includes filtered water that has flowed out from the physical filtration device Pf and oxygen gas (pure oxygen or mostly oxygen) introduced from an oxygen supply source Ox (see FIG. 2) such as an oxygen gas cylinder or an oxygen supply device. Gas) to produce gas-liquid mixed water Rm. The generation apparatus A refines 90% or more of the oxygen gas into nano-level bubbles (outer diameter of 1 μm or less, preferably 100 nm or less; hereinafter also referred to as “nano bubbles”) and breeding water (Specifically, it is made uniform by mixing with physical filtration treated water). In the gas-liquid mixed water Rm generated by the generator A, oxygen gas is dissolved in a supersaturated state. That is, the supersaturated state (for example, 140%) in which the dissolved oxygen saturation of the gas-liquid mixed water Rm is 100% or more is set. The dissolved oxygen saturation here is a value (%) obtained by dividing the dissolved oxygen amount by the saturated dissolved oxygen amount and multiplying the divided value by 100. The dissolved oxygen saturation of the gas-liquid mixed water Rm when flowing out of the generator A is determined by the amount of oxygen gas introduced into the generator A according to the type, size, number, etc. of seafood to be bred in the breeding aquarium Fa. It can adjust by adjusting suitably according to it. A specific configuration of the generation device A will be described later.

The biofiltration device Bf introduces the nanobubble-containing gas-liquid mixed water Rm that flows out from the generating device A, and converts the highly toxic seafood excreta contained in the gas-liquid mixed water Rm into an aerobic environment. By the action of nitrifying bacteria, which are bacteria, biofiltration is performed by oxidizing to nitric acid with low toxicity via nitrite. As a medium for nitrifying bacteria, an immersion filter medium is used. Since the size of the container of the biological filtration device Bf that performs the biological filtration process and the required amount of filter medium vary depending on the size and number of fish and shellfish bred in the breeding aquarium Fa, the amount of nitrogen excreted from ammonia and the like and the ammonia oxidation of the filter medium Design appropriately based on speed. Further, oxygen gas is dissolved in a supersaturated state (for example, 120%) also in the gas-liquid mixed water Rm supplied (refluxed) to the breeding aquarium Fa after being subjected to biological filtration by the biological filtration device Bf. . Adjustment of the dissolved oxygen saturation of the gas-liquid mixed water Rm that is refluxed to the breeding aquarium Fa is carried out by adjusting the dissolved oxygen saturation of the gas-liquid mixed water Rm when introduced from the generator A to the biological filtration device Bf in advance. It can be carried out by appropriately adjusting according to the type, size, number of individuals, etc. of the seafood bred in Fa.

The temperature control device Ta heats or cools the gas-liquid mixed water Rm flowing out from the biological filtration device Bf, thereby controlling the water temperature of the gas-liquid mixed water Rm stored in the breeding aquarium Fa within a certain range (for example, 15 ˜25 ° C., preferably 16 ° C.). The temperature control device Ta is connected to a water intake source Ws such as a well outside the system, and heat exchange is performed with temperature control water introduced from the water intake source Ws so that the water temperature of the gas-liquid mixed water Rm can be appropriately adjusted. E is a water intake facility, and the water intake facility E includes a water intake pump that takes in groundwater, a water intake filter that filters water intake, a sterilizer that sterilizes water intake, and the like.

An air supply device As such as a blower pump that pumps air through an air supply pipe Pa is connected to the breeding water tank Fa and the biological filtration device Bf.

In the aquaculture system Sy configured as described above, the gas-liquid mixed water Rm in which oxygen gas is dissolved in a supersaturated state is generated by the generating device A, and the gas-liquid mixed water Rm is supplied to the biological filtration device Bf. Therefore, oxygen gas necessary for nitrification in the biological filtration device Bf can be sufficiently supplied. At this time, since the oxygen gas is in the form of nanobubbles, the oxygen gas stays for a long time in the biological filtration device Bf, and oxygen is dissolved and diffused from the bubbles into the gas-liquid mixed water Rm. Therefore, it is not necessary to treat the breeding water that has been subjected to biological filtration separately with an oxygen dissolving device to increase the dissolved oxygen content (DO value) of the breeding water. That is, an oxygen dissolving device is not necessary. Therefore, the cost can be reduced accordingly.

Since the filtered water that has been physically filtered by the physical filtration device Pf is mixed with the oxygen gas that has become nanobubbles by the generation device A, the carbon dioxide index accumulated in the breeding water in the circulation channel C No decrease in pH occurs. Therefore, there is no need to provide a deaeration device for removing carbon dioxide gas. Here, the reason for removing the carbon dioxide gas is that the breeding fish discharges carbon dioxide by respiration, and when the concentration increases, the pH of the breeding water decreases, the growth of the breeding fish slows down, and the like. Therefore, in this embodiment, the cost can be reduced because there is no need to provide a deaeration device.

By feeding air into the breeding water tank Fa by the air supply device As, the breeding water or the gas-liquid mixed water Rm can be circulated in the breeding water tank Fa. As a result, the environment for raising seafood can be improved. Further, nitrifying bacteria can be activated by pumping air to the biological filtration device Bf by the air supply device As. As a result, the nitrification effect can be enhanced.

[Specific description of configuration of generation apparatus]
The configuration of the generation apparatus A according to the first to third embodiments will be specifically described below with reference to the drawings.

<Description of Generation Device According to First Embodiment>
As shown in FIG. 2, the generation device A as the first embodiment accommodates the breeding water W introduced from the physical filtration device Pf in a top-opened box-type tank T, and the gas-liquid mixing device in the breeding water W M is immersed in the structure. The gas-liquid mixing device M is connected to the oxygen supply source Ox, and can mix the oxygen gas taken from the oxygen supply source Ox and the breeding water W to generate the gas-liquid mixed water Rm. The breeding water W is gas-liquid mixed water Rm generated by the generator A and circulated in the circulation channel C, and the gas-liquid mixed water Rm is stored in the tank T.

(Schematic description of gas-liquid mixing device)
As shown in FIGS. 3 to 6, the gas-liquid mixing apparatus M nano-scales the oxygen gas supplied from the submersible pump P and the oxygen supply source Ox used by being immersed in the breeding water W in the housing case 10. A fine bubble generating means 20 that becomes a fine bubble of a level and diffuses in the liquid, and a gas-liquid mixing means 30 as a first embodiment that further refines the fine bubble and uniformly mixes with the liquid. Is configured. The gas-liquid mixing means 30 can make the breeding water W in the tank T into nanobubble-containing water containing nanobubbles containing oxygen gas as a component quickly and easily.

(Description of the storage case)
As shown in FIGS. 3 to 6, the storage case 10 is formed by connecting a bottom case forming body 11 formed in a rectangular flat box shape with an upper opening to a covering case forming body 12 formed in a rectangular box shape with a lower opening. Forming. The front and

rear end walls

12a and 12b and the left and

right side walls

12c and 12d forming the peripheral wall of the covering case forming body 12 are formed with a large number of liquid inflow holes 13 through which liquid flows. A cylindrical cable insertion portion 14 and a pipe connection portion 15 are provided in the ceiling portion 12e of the covering case forming body 12 so as to penetrate in the vertical direction. The cable insertion part 14 has a cable insertion hole for inserting the power transmission cable 6. Further, the pipe connection portion 15 has a pipe communication path for connecting the external gas supply pipe 7 and the internal gas supply pipe 22 in communication. 14a is a cable insertion part fixing piece, and 15a is a pipe connection part fixing piece.

The submersible pump P is configured such that an impeller accommodating portion 2 that accommodates an impeller (not shown) is continuously provided below a motor accommodating portion 1 that accommodates a motor (not shown), and a leg portion 3 is suspended from the lower end of the impeller accommodating portion 2. is doing. The impeller accommodating portion 2 is formed in a flat container shape, and a suction opening portion 4 for sucking fluid (liquid mixed with bubbles in the present embodiment) is formed in a circular opening shape downward while a motor accommodating portion is formed. A discharge port portion 5 for discharging a fluid is formed in a circular opening shape on the upper surface portion of a bulge portion 2a formed in a bulge shape forward of 1 and upward. To the motor of the submersible pump P in the housing case 10, a power transmission cable 6 inserted from the outside of the housing case 10 into the cable insertion portion 14 is connected. The leg 3 of the submersible pump P is fixed to the bottom case forming body 11 in a standing manner via a fixing bracket 8. Reference numeral 9 is a corner protector, and 12f is a handle. By gripping the handle 12f, moving work such as loading and unloading of the gas-liquid mixing device M can be performed easily. Es is a power source that supplies electricity to the submersible pump P through the power transmission cable 6. The submersible pump P rotates the impeller with a motor, thereby sucking fluid from the suction port 4 and discharging fluid from the discharge port 5.

(Explanation of fine bubble generation means)
As shown in FIGS. 4 to 6, the fine bubble generating means 20 includes an air diffuser 21 and an internal gas supply pipe 22 that is connected to the air diffuser 21 in communication therewith. The air diffuser 21 is formed of a porous diffused gas 21a made of ceramic or the like in a cylindrical shape, and

support pieces

21b and 21b are provided at both ends of the diffused gas 21a. A cylindrical connecting part 21c is projected from the center of one support piece 21b. The inner end of the connecting part 21c communicates with the internal space of the diffused gas 21a and is connected to the outer end of the connecting part 21c. One end of the internal gas supply pipe 22 is externally fitted and connected.

In the present embodiment, a pair of left and

right aeration parts

21 and 21 are disposed on the bottom case forming body 11 so as to be positioned on the left and right sides of the leg part 3 of the submersible pump P. The

connection parts

21c and 21c of both the

aeration parts

21 and 21 are projected forward. The internal gas supply pipe 22 has a base end connected to the lower end of the pipe connecting portion 15 provided in the ceiling portion 12e of the covering case forming body 12, and a bifurcated bifurcated branch at the tip.

Branch portions

22a and 22a are formed, and the

bifurcated branch portions

22a and 22a are externally fitted and connected to the

connection portions

21c and 21c. A distal end portion of the external gas supply pipe 7 is connected to an upper end portion of the pipe connection portion 15, and a proximal end portion of the external gas supply pipe 7 is connected to the oxygen supply source Ox. And oxygen is supplied from the oxygen supply source Ox to the external gas supply pipe 7 → the pipe connection portion 15 → the internal gas supply pipe 22 → the

bifurcated branch portions

22a and 22a → the

connection portions

21c and 21c → the diffused

gas

21a and 21a. Air is diffused into the breeding water W through the surfaces of the porous diffused

gas

21a and 21a. At this time, the oxygen gas diffused from each of the diffused

gases

21a and 21a is refined to a micro level. For example, “Airstone” (trade name) manufactured by New Marines can be used as the air diffuser 21.

(Description of Gas-Liquid Mixing Unit as First Embodiment)
The gas-liquid mixing means 30 according to the first embodiment is connected in an upright manner to the discharge port portion 5 of the submersible pump P as shown in FIGS. As shown in FIG. 8, the gas-liquid mixing means 30 communicates with the gas-liquid supply path 31 that communicates with the discharge port portion 5, and flows through the gas-liquid supply path 31 while meandering the oxygen gas and the breeding water W. And a dispersion / mixing flow path 32 for finely dispersing and mixing oxygen gas in the breeding water W. A large number of dispersion / mixing flow paths 32 communicate with each other at intervals in the axial direction and the circumferential direction of the gas-liquid supply path 31, and breeding water W (gas-liquid mixing) mixed with bubbles from the end of each dispersion / mixing flow path 32. Water Rm) is allowed to flow out.

That is, the gas-liquid supply path 31 is formed in the gas-liquid supply path forming case 33, and the gas-liquid supply path forming case 33 has a regular octagonal cylindrical shape as shown in FIGS. The peripheral wall 34 is formed, an upper end surface portion 35 formed to be stretched on the upper end surface of the peripheral wall 34, and a lower end surface portion 36 formed to be stretched on the lower end surface of the peripheral wall 34. The lower end surface portion 36 is formed in a disk shape projecting outward from the peripheral wall 34. An introduction port 37 is formed in the rear portion of the lower end surface portion 36 so as to be positioned in the peripheral wall 34, and the lower surface of the lower end surface portion 36 located at the peripheral portion of the introduction port 37 is larger in diameter than the introduction port 37 and cylindrical. The introduction guide body 38 is suspended and the inside of the introduction guide body 38 and the introduction port 37 are communicated in the vertical direction. The introduction guide body 38 can be fitted into the discharge port portion 5 to connect the gas-liquid supply path forming case 33 to the impeller housing portion 2 in communication. At this time, the gas-liquid supply path 31 in the gas-liquid supply path forming case 33 communicates with the discharge port portion 5 of the impeller accommodating portion 2 via the introduction guide body 38 and the introduction port 37.

As shown in FIGS. 7 and 8, a large number of mixing units 40 are attached to the gas-liquid supply path forming case 33. In other words, the peripheral wall 34 of the gas-liquid supply path forming case 33 is formed in a regular octagonal cylindrical shape as described above, and a plurality of (in this embodiment) the eight planes of the peripheral wall 34 are spaced apart in the vertical direction. Four) flow passage holes 39 are formed in a circular opening shape. A mixing unit 40 is attached to each of the eight planes of the peripheral wall 34 so as to close the respective channel communication holes 39.

As shown in FIGS. 11 to 13, the mixing unit 40 has a first element 41 and a second element 42 that are formed in a substantially identical disk shape and are opposed to each other. Dispersion / mixing flow path 32 is formed in this.

The dispersion / mixing flow path 32 communicates between the flow path communication holes 39 between the central portions, which are the starting edge portions of both

elements

41 and 42, via an inflow port 43 formed in the central portion of the first element 41. The outflow ports 44 that open radially between the outer peripheral edges, which are the end edges of the

elements

41 and 42, are formed. A group of a large number of

recesses

45 and 46 having the same depth and size are formed on the opposing surfaces of the

elements

41 and 42 in an orderly manner without any gaps from the inlet 43 side toward the outlet 44 side. The opposing recesses 45 and 46 are arranged at different positions so as to communicate with each other, and between the opposing

recesses

45 and 46, the liquid mixed with bubbles repeats merging and splitting while meandering. It forms so that it may flow toward the outflow port 44 side from the inflow port 43 side.

On the lower end surface portion 36 of the gas / liquid supply path forming case 33, as shown in FIGS. 7 and 10, a mixed gas / liquid outlet path forming case 50 covering the peripheral wall 34 and the upper end surface portion 35 is placed and connected, A gas / liquid outlet path 51 is formed between the outer surface of the gas / liquid supply path forming case 33 and the inner surface of the gas / liquid outlet path forming case 50. The gas-liquid-liquid lead-out path forming case 50 includes a cylindrical peripheral wall forming piece 52, a ceiling forming piece 53 that is connected to the upper edge of the peripheral wall forming piece 52, and a circular shape that opens at the upper front of the peripheral wall forming piece 52. And a cylindrical lead-out guide body 55 projecting forward from the peripheral edge of the lead-out port 54. As shown in FIGS. 3 to 6, the lead-out guide body 55 protrudes forward from a circular opening 12g opened at the top of the front end wall 12a of the housing case 10. A bulging portion 56 that bulges inward along the peripheral edge is formed on the inner peripheral edge of the lower end of the peripheral wall forming piece 52, and a plurality of female screw holes 56 a having axial lines directed vertically in the bulging portion 56. They are formed at intervals in the circumferential direction. Reference numeral 36a denotes a number of screw holes formed in the outer peripheral portion of the lower end surface portion 36 so as to be aligned with the female screw hole 56a. By screwing screws 57 passed through the screw holes 36a into the female screw hole 56a, the screw hole 36a is mixed with the lower end surface portion 36. The gas-liquid outlet path forming case 50 is connected.

The gas-liquid mixing apparatus M is configured as described above. According to the gas-liquid mixing apparatus M, the following operational effects are produced. That is, by immersing the housing case 10 in the breeding water W in the tank T, the submersible pump P is soaked in the breeding water W, and the diffused

gas

21a, 21a is supplied from the oxygen supply source Ox through the internal gas supply pipe 22. Gas is supplied, and oxygen gas refined | miniaturized to micro level through the diffused

gas

21a and 21a is diffused in the breeding water W. Then, the submersible pump P is driven to suck water mixed with bubbles (initial bubble mixed water) R from the suction port 4 and form a gas-liquid supply path from the discharge port 5 of the submersible pump P through the inlet 37. Pump into the case 33. The initial bubble mixed water R fed into the gas-liquid supply path forming case 33 flows into the dispersion / mixing flow path 32 of the flow passage communication hole 39 → the inlet 43 → the mixing unit 40, and joins and splits while meandering. It repeats to flow toward the outlet 44 side. At this time, the bubbles refined to the micro level are refined to the nano level and uniformly mixed with the breeding water W. In addition, the oxygen is refined in advance before being sucked into the submersible pump P to form macro-level fine bubbles, thereby preventing air biting of the submersible pump P and the macro-level fine after being discharged from the submersible pump P. Since the air bubbles can be further refined by the mixing unit 40, most of the air bubbles can be steadily reduced to the nano level.

A large number of dispersion / mixing channels 32 for finely dispersing and mixing bubbles in the breeding water W communicate with each other at intervals in the axial direction and the circumferential direction of the gas-liquid supply channel 31, and each dispersion / mixing flow Since the liquid mixed with bubbles (the gas-liquid mixed water Rm, which is the final bubble mixed water shown in FIGS. 7 and 8) is allowed to flow out from the terminal portion of the path 32, the pressure loss in the mixing unit 40 can be reduced. In addition, it is possible to increase (efficiency) the outflow amount of the gas-liquid mixed water Rm containing nanobubbles. In addition, the dispersion / mixing flow path 32 that can reduce pressure loss can be formed in a compact manner, and a large number of compactly formed dispersion / mixing flow paths 32 can be formed. The outflow amount (efficiency) of the gas-liquid mixed water Rm to be performed can be increased.

The gas-liquid mixed water Rm that has flowed out from the outlet 44 of the mixing unit 40 is discharged from the mixed gas-liquid outlet path 51 → the outlet 54 → the outlet guide body 55 into the liquid to be mixed.

(Specific description of mixing unit configuration)
Next, the configuration of the mixing unit 40 will be described more specifically. That is, as shown in FIGS. 8 and 11 to 13, the mixing unit 40 has a disk-shaped first element 41 formed with a disk-shaped first element 41 having an inlet 43 for the initial bubble mixed water R formed in the center. Two elements 42 are arranged facing each other, and the initial bubble mixed water R flowing in from the inflow port 43 on the central part side is caused to flow in the radial direction toward the peripheral part between the faces of both

elements

41 and 42 and dispersed. A dispersion / mixing flow path 32 to be mixed is formed and configured. A screw hole 61 is provided in the center of the first element 41, that is, in the center of the inflow port 43 via a support piece 60, while a screw hole 62 is formed in the center of the second element 42 to be matched. By screwing a screw 63 into the screw hole 61 and the screw hole 62, the

elements

41 and 42 are connected in a face-to-face state to form the mixing unit 40. First and second attachment holes 64, 64, 65, 65 that match each other are formed in the upper and lower portions of both

elements

41, 42 so as to be parallel to the central axis, and the peripheral wall of the gas-liquid supply path forming case 33 34, third mounting

holes

66, 66 that coincide with the first and second mounting holes 64, 64, 65, 65 are formed, and mounting bolts 67 are screwed into the first to third mounting holes 64-66. The mixing unit 40 is attached to the peripheral wall 34 by wearing.

As shown in FIGS. 11 to 13, the dispersion / mixing channel 32 has a large number of the same shape and the same size, each having an opening shape of a regular hexagon (honeycomb shape) on the opposing surfaces of the first and

second elements

41 and 42. The

recesses

45 and 46 are arranged in an orderly manner without any gaps. The opening surfaces of the

recesses

45 and 46 of the

elements

41 and 42 are arranged in contact with each other in abutting manner and at different positions so as to communicate with each other. The number of the

concave portions

45 and 46 of each

element

41 and 42 arranged on the same circumference centering on the inlet 43 of the initial bubble mixed water R is gradually increased from the central side toward the peripheral side to flow. The diversion number (dispersion number) is increased in the radial direction. An outlet 44 is formed on the peripheral edge side between the

elements

41 and 42.

As shown in FIG. 13, the contact surfaces of both

elements

41 and 42 are in a state where a corner 48 where the three recesses 46 of the second element 42 are gathered is located at the center of the recess 45 of the first element 41. In contact.

When the first element 41 and the second element 42 are brought into contact with each other in such a state, the initial bubble mixed water R can flow between the recess 45 of the first element 41 and the recess 46 of the second element 42. .

Therefore, for example, considering the case where the initial bubble mixed water R flows from the concave portion 45 side of the first element 41 to the concave portion 46 side of the second element 42, the initial bubble mixed water R is divided (dispersed) into two flow paths. Will be.

That is, the corner portion 48 of the second element 42 arranged at the center position of the recess 45 of the first element 41 functions as a diversion portion for diverting the initial bubble mixed water R. On the other hand, considering the case where the initial bubble mixed water R flows from the second element 42 side to the first element 41 side, the initial bubble mixed water R flowing from two directions flows into one concave portion 45 and merges. become. In this case, the corner portion 48 of the second element 42 functions as a merging portion.

Also, the corner 47 where the three recesses 45 of the first element 41 are gathered is located at the center position of the recess 46 of the second element 42. In this case, the corner portion 47 of the first element 41 functions as the diversion portion or the merge portion described above.

As described above, the initial bubble mixed water R supplied in the axial direction of the

elements

41 and 42 from the central inflow port 43 is separated between the

elements

41 and 42 facing each other in a facing state. A dispersion / mixing flow path 32 (see FIG. 6) is formed that flows in a meandering manner in the radiation direction (radial direction perpendicular to the axial direction) of both

elements

41 and 42 while repeating the joining (dispersing and mixing). In the process in which the initial bubble mixed water R flows in the dispersion / mixing flow path 32, the initial bubble mixed water R is subjected to the dispersion / mixing process to generate the gas-liquid mixed water Rm which is the final bubble mixed liquid.

In the mixing unit 40 configured in this way, the number of the

concave portions

45 and 46 of the first and

second elements

41 and 42 gradually increases from the central side toward the peripheral side, so that the initial bubble mixed water R The number of the

concave portions

45 and 46 where the two are merged increases toward the peripheral portion side, and is distributed (distributed) in proportion to the number of the

concave portions

45 and 46. Therefore, in the dispersion / mixing flow path 32, the number of times the initial bubble mixed water R is refined by the shearing force is along the flow direction of the initial bubble mixed water R (radial direction toward the peripheral side). Gradually increases. As a result, a large amount of the initial bubble mixed water R containing micro-level bubbles is discharged as a gas-liquid mixed water Rm which is a final bubble mixed liquid containing nanobubbles steadily through the dispersion / mixing channel 32. .

<Description of Generation Device According to Second Embodiment>
(Overall description of the generating apparatus according to the second embodiment)
As shown in FIG. 14, the generation device A according to the second embodiment includes gas-liquid mixing means 30 as the second embodiment. That is, the generator A connects the base end of the circulation pipe J to the bottom of the top-opening box-shaped tank T containing the breeding water W, and the tip of the circulation pipe J is placed in the breeding water W in the tank T. By inserting, the production | generation circulation flow path Cy which circulates the fluid in the tank T and the circulation pipe J is formed. An oxygen supply source Ox is connected to the middle of the circulation pipe J via an oxygen supply pipe K1, and a gas-liquid mixing means 30 is connected to the downstream of the oxygen supply source Ox. The gas-liquid mixing means 30 applies the shearing force to the gas-liquid mixed phase of the oxygen gas supplied from the oxygen supply source Ox and the breeding water W, so that the oxygen gas becomes a group of bubbles having ultrafine bubbles. It is configured to be mixed with W.

A suction pump P1 and a discharge pump P2 are arranged adjacent to each other in the middle of the circulation pipe J located on the downstream side of the tank T in series. An oxygen supply source Ox is connected to a portion of the circulation pipe J located between the discharge port of the suction pump P1 disposed on the upstream side and the suction port of the discharge pump P2 disposed on the downstream side via the oxygen supply pipe K1. Is connected. Here, the discharge pressure of the suction pump P1 is set to be equal to or lower than the suction pressure of the discharge pump P2. V1 is a gas supply amount adjustment valve provided in the middle of the oxygen supply pipe K1, V2 is a pressure adjustment valve attached to the tip of the circulation pipe J, and Wk is a breeding water W as a solvent in the tank T as needed. This is a breeding water supply section that can be supplied.

A backwash channel Bw is connected to the above-described generation circulation channel Cy. That is, one end of the backwash bypass pipe U is connected to the portion of the circulation pipe J located immediately upstream of the gas-liquid mixing means 30 via the upstream three-way valve V3, while the gas-liquid mixing means One end portion of the backwashing detour pipe U is connected to the circulation pipe J located on the downstream side of 30 through a downstream three-way valve V4. A midway part three-way valve V5 is provided in the middle part of the backwash detour pipe U, and the drainage accommodating part H is connected via the midway part three-way valve V5. The backwash flow path Bw is formed by communicating the circulation pipe J and the backwash bypass pipe U via the upstream / downstream three-way valves V3 and V4. Then, the wash water stored in the tank T is circulated by the suction pump P1 and / or the discharge pump P2 in the backwash flow path Bw as many times as necessary, so that the wash water flows from the downstream side to the upstream side of the gas-liquid mixing means 30. The gas-liquid mixing means 30 can be washed (backwashed) by flowing back. After the back washing treatment, the washing waste water can be discharged to the waste water storage portion H through the midway three-way valve V5 provided in the middle of the backwash bypass pipe U. Thereafter, the three-way valves V3, V4, and V5 are restored to restore the generation circulation flow path Cy, and the breeding water W is accommodated in the tank T, whereby the fluid mixing process can be resumed. .

In the generating apparatus A configured as described above, the oxygen pump supplied from the oxygen supply source Ox disposed between them by the suction pump P1 and the discharge pump P2 cooperates from the discharge port of the suction pump P1. And a suction pressure (ejector effect) from the suction port of the discharge pump P2, and is sucked smoothly and stably. As a result, a constant amount of oxygen gas mixed into the breeding water W can be ensured. Moreover, in this embodiment, since the generation | occurrence | production capability of the mixed fluid of breeding water W and oxygen gas can be ensured and the suction pump P1 and the discharge pump P2 with low power consumption can be combined and used together, Manufacturing costs and running costs can be reduced.

Further, by operating the upstream / downstream three-way valves V3 and V4 to form the backwash flow path Bw, the wash water is caused to flow backward from the downstream side of the gas-liquid mixing means 30 to the upstream side, so that the gas-liquid mixing means 30 The inside can be washed (backwashed). After the back washing process, the washing waste water can be discharged to the waste water storage portion H through the midway three-way valve V5. Thereafter, the fluid mixing process can be easily restarted by restoring the three-way valves V3, V4, and V5. Thus, the fluid mixing function of the gas-liquid mixing means 30 can be satisfactorily ensured by appropriately performing the backwash process.

(Description of Gas-Liquid Mixing Unit as Second Embodiment)
The gas-liquid mixing means 30 as the second embodiment will be described with reference to FIGS. As shown in FIGS. 15 to 18, the gas-liquid mixing means 30 is provided with an inlet port in a mixing case 110 provided with an inlet port 111 for introducing bubble-mixed water (initial bubble mixed water) R in a pressurized state. A plurality of mixing units 120 for mixing the initial bubble mixed water R introduced from 111 is disposed, and the gas / liquid mixed water Rm (final bubble mixed water) mixed by the mixing unit 120 is led to the mixing case 110. An outlet 112 is provided.

In the mixing case 110, a plurality of mixing units 120 are arranged in series at intervals from the introduction port 111 side to the outlet port 112 side to form a relay reservoir space Sh between the mixing units 120. At the same time, the inlet-side reservoir space Su is formed between the inlet 111 and the mixing unit 120 arranged on the most upstream side, while the outlet is formed between the mixing unit 120 arranged on the most downstream side and the outlet 112. A side reservoir space Sd is formed, and the mixing unit 120 is arranged in communication between the reservoir spaces Su, Sh, Sd.

In the mixing unit 120, the surfaces of the plate-like first element 130 and the second element 140 are arranged so as to face each other, and the gap between the start end edges of both the

elements

130, 140 serves as the inflow port 150. 140 is formed as an outlet 151, and a plurality of

recess groups

132 and 142 having the same depth and size are flowed from the inlet 150 side on the opposing

surfaces

131 and 141 of both

elements

130 and 140. The

recesses

134 and 144 facing each other toward the outlet 151 side are arranged at different positions so as to communicate with each other. The initial bubble mixed water R is configured to flow from the inlet 150 side toward the outlet 151 side while repeating joining and splitting while meandering between 134 and 144.

The gas-liquid mixing means 30 of this embodiment forms a mixing unit stack 160 by superposing and arranging a plurality (10 in this embodiment) of the mixing units 120 in a stacked manner, and introducing the mixing unit 110 into the mixing case 110. Between the inlet 111 and the outlet 112, between the inlet-side reservoir space Su and the relay reservoir space Sh, between the relay reservoir space Sh and the relay reservoir space Sh, and between the relay reservoir space Sh and the outlet port-side reservoir. Between the spaces Sd, the mixed unit laminates 160 are respectively disposed. In other words, in the present embodiment, a plurality (four in the present embodiment) of the mixing unit stacks 160 are arranged in series in the mixing case 110 with a certain interval from the upstream side toward the downstream side. . The inlet 150 of each mixing unit 120 is arranged to open toward the inlet 111, while the outlet 151 of each mixing unit 120 is arranged to open toward the outlet 112.

In the gas-liquid mixing means 30 configured as described above, the following functions and effects occur. That is, between the inlet 111 and the outlet 112 in the mixing case 110, between the inlet-side reservoir space Su and the relay reservoir space Sh, between the relay reservoir space Sh and the relay reservoir space Sh, and between the relay Since the mixing units 120 are arranged to communicate with each other between the reservoir space Sh and the outlet-side reservoir space Sd, the initial bubble mixed water R flowing in the mixing case 110 is contained in each reservoir space having no flow resistance. A pulsating flow is steadily caused by passing through Su, Sh, Sd and each mixing unit 120 which becomes flow resistance alternately in series.

That is, the initial bubble mixed water R flowing in each mixing unit 120 having a mixing function, although the flow velocity of the initial bubble mixed water R flowing in the pool spaces Su, Sh, Sd having almost no flow resistance is relatively large. Is subjected to flow resistance and its flow rate is relatively reduced. Therefore, the flow velocity of the initial bubble mixed water R flowing in the mixing case 110 is changed (severely changed) from large → small → large → small → large, and the flow of the initial bubble mixed water R becomes a steady pulsating flow. As a result, not only when flowing in each mixing unit 120 but also when flowing as a pulsating flow in the mixing case 110, a shearing effect is generated, and a synergistic shearing effect is obtained.

Further, the reservoir spaces Su, Sh, and Sd are arranged on the upstream side and the downstream side of each mixing unit 120, respectively, and the inlet 150 of each mixing unit 120 is opened toward the introduction port 111 side. In addition, since the outlet 151 of each mixing unit 120 is arranged to open toward the outlet 112, the pressure loss in the mixing case 110 can be reduced. Therefore, the power consumption of the suction pump P1 and the discharge pump P2 that pressurizes and supplies the fluid to the gas-liquid mixing means 30 can be reduced, and the outflow amount of the gas-liquid mixed water Rm (mixed fluid) ( (Amount of derivation) can be increased (efficiency).

Further, in the present embodiment, the initial bubble mixed water R is introduced into the mixing case 110 in a pressurized state through the inlet 111 by the suction pump P1 and the discharge pump P2, and is initially set by the mixing unit 120 disposed in the mixing case 110. By mixing the bubble mixed water R, the gas-liquid mixed water Rm can be led out of the mixing case 110 through the outlet 112.

In the mixing unit 120, the initial bubble mixed water R is caused to flow from the inlet 150 between the plate-like first element 130 and the second element 140, the surfaces of which are arranged to face each other. The initial bubble mixed water R is repeatedly merged and divided between the

opposed recesses

134 and 144 of the

respective recess groups

132 and 142 until it flows out from the outlet 151 between the

terminal edges

130 and 140. However, the gas-liquid mixed water Rm can be generated steadily by meandering and flowing.

At this time, a fluid (dispersed phase) is formed by shearing force received when the initial bubble mixed water R composed of the continuous phase and the dispersed phase flows while meandering between the

recesses

132 and 142 on the inlet side (upstream side). Gas-liquid mixed water Rm in which the gas is refined in the form is generated.

In this manner, in the continuous flow path from the inlet 150 to the outlet 151 while repeating the merging and splitting while the initial bubble mixed water R meanders between the opposing

depressions

134 and 144 of the

respective depression groups

132 and 142, Since the fluid as the dispersed phase is refined a plurality of times while receiving different shearing forces, it is possible to steadily and efficiently carry out refinement to the micro level or nano level.

In the gas-liquid mixing means 30 of the present embodiment, a plurality of mixing unit laminates 160 formed by superposing and arranging the mixing units 120 in a stacked manner are disposed in the mixing case 110. A large amount of gas-liquid mixed water Rm can be generated by the body 160. Therefore, the production efficiency of the gas-liquid mixed water Rm can be increased. As a result, the gas-liquid mixing means 30 can generate the gas-liquid mixed water Rm having high mixing accuracy (for example, fineness and uniformity) even if the initial bubble mixed water R is passed once (one pass). The desired gas-liquid mixed water Rm can be obtained in a short time by passing it a predetermined number of times.

(Specific description of the gas-liquid mixing means as the second embodiment)
Next, the structure of the gas-liquid mixing means 30 as 2nd Embodiment is demonstrated more concretely. That is, the mixing case 110 is formed in a rectangular box shape extending in one direction (left and right direction in the present embodiment), and has a rectangular plate-like ceiling portion 113 and bottom portion 114 extending in the left and right direction, A rectangular plate-shaped front / rear / left /

right side wall

115, 116, 117, 118 interposed between front, rear, left and right side edges of the bottom 114 is formed. A circular inlet 111 is provided at the center of the right side wall 118, and the upstream end of the middle part of the circulation pipe J is connected to the inlet 111, and initial bubble mixing is performed from the inlet 111 through the circulation pipe J. Water R is introduced in a pressurized state. At the center of the left side wall 117, a circular outlet 112 having a smaller diameter than the inlet 111 is provided, and the downstream end of the middle part of the circulation pipe J is connected to the outlet 112 by the mixing unit 120. The mixed gas-liquid mixed water Rm is led out from the outlet 112 through the circulation pipe J.

The concave group 132 of the mixing unit 120 has an opening shape (bottom view) of a hexagonal bottomed cylindrical concave part 134 in the extending direction (in this embodiment, with no gap) in the width direction (front and rear direction in this embodiment). A plurality of rows (4 rows in the present embodiment) are provided adjacent to each other in the left-right direction, and the recesses 134 are opened downward. A large number of recesses 134 are formed in a so-called honeycomb shape.

Further, the concave group 142 of the mixing unit 120 has a regular hexagonal bottomed cylindrical concave part 144 on the side of the inflow port 150 of the opposing surface 141 of the second element 140 with a gap across the width direction (the front-rear direction in this embodiment). In this state, the projections are provided adjacent to a plurality of rows (four rows in this embodiment) in the extending direction (left and right directions in the present embodiment), and the concave portions 144 are opened upward. Many concave portions 144 are formed in a so-called honeycomb shape.

The recesses 134 that form the recess groups 132 and the recesses 144 that form the recess groups 142 are arranged to face each other and at different positions so as to communicate with each other. That is, the corner portion 146 (136) of the concave portion 144 (134) is in contact with the central position of the concave portion 134 (144). Therefore, for example, when considering the case where the initial bubble mixed water R flows from the concave portion 134 side of the first element 130 to the concave portion 144 side of the second element 140, the initial bubble mixed water R is divided (dispersed) into two flow paths. Will be. That is, the corner portion 146 of the second element 140 positioned at the center position of the concave portion 134 of the first element 130 functions as a diversion portion for diverting the initial bubble mixed water R. On the other hand, considering the case where the initial bubble mixed water R flows from the second element 140 side to the first element 130 side, the initial bubble mixed water R flowing from two directions flows into one concave portion 134 and merges. become. In this case, the corner portion 136 of the first element 130 located at the center position of the concave portion 144 of the second element 140 functions as a merging portion.

The mixing unit 120 may be configured integrally by forming each part (constituent member) with a synthetic resin such as an acrylic resin and integrally bonding them with an adhesive, or an alloy such as stainless steel. Each part can be formed by the above, and these can be integrally assembled by screwing together.

In the present embodiment, the initial bubble mixing is greater than the width W2 of the mixing unit 120 that is the flow width of the initial bubble mixed water R (the width in the flow direction of the initial bubble mixed water R flowing from the inlet to the outlet). The front / rear width W5 of the mixing unit 120 that is the inflow / outflow width of the water R (the width in the direction substantially perpendicular to the flow direction of the initial bubble mixed water R and the same width as the distance between the front and rear wall portions 115, 116) Is formed into a wide band. The left-right width W1 of the inlet-side reservoir space Su is substantially the same width as the left-right width W2 of the mixing unit 120, and the left-right width W3 of the relay reservoir space Sh is approximately half the left-right width W2 of the mixing unit 120. None, the left-right width W4 of the outlet-side reservoir space Sd is substantially the same width as the left-right width W2 of the mixing unit 120. The front-rear width and the vertical width of each pool space Su, Sh, Sd are the same as the front-rear width and the vertical width of the inner surface of the mixing case 110. Then, the downstream side surface of the inlet-side reservoir space Su and the inlets 150 of the first mixing unit laminate 160 arranged on the most upstream side are in surface contact and communicate with each other. The outflow port 151 and the upstream side surface of the first relay pool space Sh formed on the uppermost stream side are in surface contact and communicate with each other, and the downstream side surface of the first relay pool space Sh and the second mixing unit laminate Each inflow port 150 of 160 is in surface contact and communicates, and each outflow port 151 of the second mixing unit laminate 160 and the upstream side surface of the second relay reservoir space Sh are in surface contact and communication. The downstream side surface of the second relay reservoir space Sh and the respective inlets 150 of the third mixing unit laminate 160 communicate with each other in surface contact with each outlet 151 of the third mixing unit laminate 160. And the upstream side surface of the third relay reservoir space Sh The downstream side surface of the third relay reservoir space Sh and the respective inlets 150 of the fourth mixing unit laminate 160 are in surface contact with each other, and the respective outlets 151 of the fourth mixing unit laminate 160 are communicated. And the upstream side surface of the outlet port side accumulation space Sd are in surface contact and communicate with each other. The left and right widths W2 to W4 are preferably set such that left and right width W1 ≧ left and right width W2 × 2, left and right width W3 = left and right width W2 / 2, and left and right width W4 ≧ left and right width W2 × (2 or 3). Thus, the volume of the outlet port side reservoir space Sd is formed to be twice or more the volume of the relay reservoir space Sh, and the volume of the inlet port side reservoir space Su is two to three times the volume of the relay reservoir space Sh. Can be formed.

In this way, the initial bubble mixed water R introduced from the inlet 111 and filling the inlet-side reservoir space Su is in a parallel state from each inlet 150 of the first mixing unit stack 160 into each mixing unit 120. And flowing in the mixing unit 120 while meandering and repeating the merging and splitting (dispersion), the shearing force causes the gas as the dispersed phase to be refined and uniformly mixed. It becomes liquid mixed water Rm.

Subsequently, the gas-liquid mixed water Rm flows out from each outlet 151 of each mixing unit 120 of the first mixing unit stack 160 and fills the first relay pool space Sh. The gas-liquid mixed water Rm filled in the first relay reservoir space Sh flows in parallel from the respective inlets 150 of the second mixing unit stack 160 into the respective mixing units 120, and enters the respective mixing units 120. In the same manner as in the first mixing unit laminate 160, the mixing process is performed. As a result, the gas that is the dispersed phase is further refined and becomes a gas-liquid mixed water Rm that is uniformly mixed.

Subsequently, the gas-liquid mixed water Rm flows out from the outlets 151 of the mixing units 120 of the second mixing unit stack 160 and fills the second relay reservoir space Sh. The gas-liquid mixed water Rm filled in the second relay reservoir space Sh flows in parallel from the respective inlets 150 of the third mixing unit stack 160 into the respective mixing units 120 and enters the respective mixing units 120. In the same manner as the second mixing unit laminate 160, the mixing process is performed. As a result, the gas that is the dispersed phase is further refined and becomes a gas-liquid mixed water Rm that is uniformly mixed.

Subsequently, the gas-liquid mixed water Rm flows out from each outflow port 151 of each mixing unit 120 of the third mixing unit stack 160 and fills the third relay reservoir space Sh. The gas-liquid mixed water Rm filled in the third relay reservoir space Sh flows in parallel from the respective inlets 150 of the fourth mixing unit stack 160 into the respective mixing units 120, and enters the respective mixing units 120. Then, the mixing process is performed in the same manner as the third mixing unit laminate 160. As a result, the gas that is the dispersed phase is further refined and becomes a gas-liquid mixed water Rm that is uniformly mixed.

Subsequently, the gas-liquid mixed water Rm flows out from the outlets 151 of the mixing units 120 of the fourth mixing unit stack 160 and fills the outlet-side reservoir space Sd. The gas-liquid mixed water Rm filled in the outlet port side reservoir space Sd is led out from the outlet port 112.

In each mixing unit 120, the front-rear width W5 of each mixing unit 120 that is the inflow / outflow width of the initial bubble mixed water R is formed wider than the lateral width of each mixing unit 120 that is the flow width of the initial bubble mixed water R. Therefore, a large amount of the initial bubble mixed water R flows and passes through each mixing unit 120 in a short time.

As described above, in the mixing case 110, the initial bubble mixed water R or the gas-liquid mixed water Rm is introduced into the inlet 111 → the inlet side accumulation space Su → the first mixing unit stacked body 160 → the first relay accumulation space Sh. → second mixing unit stack 160 → second relay storage space Sh → third mixing unit stack 160 → third relay storage space Sh → fourth mixing unit stack 160 → outlet side storage space Sd → Flows to the outlet 112.

At this time, in the mixing case 110, the reservoir spaces Su, Sh, Sd having a relatively small channel resistance and the first to fourth mixing unit laminates 160 having a relatively large channel resistance are alternately arranged. Therefore, the initial bubble mixed water R or the gas-liquid mixed water Rm flowing in the mixing case 110 becomes a pulsating flow whose flow rate changes suddenly and suddenly. Therefore, the initial bubble mixed water R receives a shearing force when flowing in the mixing case 110 as well as a shearing force when flowing in each mixing unit 120. As a result, the shear effect acting on the initial bubble mixed water R can be increased, the dispersed phase can be refined into nanobubbles, and a large amount of gas-liquid mixed water Rm can be generated.

In the present embodiment, the mixing unit stack 160 is compactly formed by superposing and arranging the required number (in this embodiment, 10) of the mixing units 120 in the mixing case 110 in a stacked manner. In addition, by arranging a plurality (four in this embodiment) of the mixing unit stacks 160 at intervals from the upstream side to the downstream side, the fluid mixing processes by the mixing units 120 can be performed in parallel at the same time. It can be done efficiently. Therefore, an appropriate amount of the gas-liquid mixed water Rm is efficiently generated and led out from the mixing case 110 by an appropriate number of mixing units 120 arranged compactly in the mixing case 110.

The gas-liquid mixing means 30 configured as described above connects the introduction port 111 to the discharge part of the submersible pump, and allows a plurality of different fluids sucked from the suction part of the submersible pump to flow into the gas-liquid mixing means 30 from the discharge part. The fluid mixing process can also be performed by discharging the fluid into the gas-liquid mixing means 30 and allowing it to flow in the gas-liquid mixing means 30.

In the present embodiment, the four mixing unit laminates 160 are arranged in the mixing case 110, but the number of the mixing unit laminates 160 is not limited to this, and the gas-liquid mixed water Rm Depending on the production amount, etc., a desired number of single or plural mixed unit laminates 160 can be provided.

<Description of Generation Device According to Third Embodiment>
The generating apparatus A according to the third embodiment can be configured by attaching the gas-liquid mixing unit 30 as the second embodiment instead of the gas-liquid mixing unit 30 as the first embodiment. In other words, in the gas-liquid mixing apparatus M, the inlet 111 is connected to the inlet guide 38 and the outlet 112 is connected to the opening 12g of the housing case 10, whereby the gas-liquid mixer 30 as the second embodiment. Can be adopted.

The generation device A according to the third embodiment configured as described above can obtain the same effects as those of the generation device A according to the first and second embodiments.

Next, an example of the aquaculture system Sy including the generating device A as the first embodiment will be described. In this embodiment, seawater as breeding water physically treated by the physical filtration device Pf is introduced into the tank T, the seawater is filled in the tank T, and two gas-liquid mixtures are mixed in the seawater in the tank T. Apparatus M was immersed. Then, 1 L / min of pure oxygen is supplied to the gas-liquid mixing device M from an oxygen gas cylinder as an oxygen supply source Ox, and seawater and oxygen gas are mixed by the gas-liquid mixing means 30, thereby making the gas fine and uniform. Gas-liquid mixed water Rm was produced. Thereafter, the gas-liquid mixed water Rm was led to the biological filtration device Bf. The temperature of the seawater at this time is about 16 ° C., and the DO value of the biological filtration device Bf is about 20 mg / L (the dissolved oxygen saturation is about 200%). The supply amount was adjusted and set. The operation of the aquaculture system Sy was performed for one month while replenishing the decreased amount of the breeding water in the breeding water tank Fa every five days. The results at that time are as follows.

That is, the DO value when the gas-liquid mixed water Rm, which is biologically filtered by the biological filtration device Bf and temperature-adjusted to about 16 ° C. by the temperature control device Ta, is sent to the breeding aquarium Fa by the circulation pump Pc, is , Approximately 10 mg / L (supersaturated state in which dissolved oxygen saturation is 100% or more). The DO value of the gas-liquid mixed water Rm in the breeding aquarium Fa is generally maintained at 7 to 8 mg / L (supersaturated state where the dissolved oxygen saturation is 100% or more), although it varies depending on the amount of the breeding fish in the breeding tank Fa. It had been. The pH of the gas-liquid mixed water Rm in the aquaculture system Sy was maintained at 7.5 to 8, and no pH decrease occurred. At the position of the circulation pump Pc, the pH is 7.8, the ammonia nitrogen contained in the gas-liquid mixed water Rm is 0.3 mg / L, the nitrite nitrogen is 0.1 mg / L, and the nitrate nitrogen is 30 mg / L. Met. In the precipitation tank Dp, the pH is 7.8, the ammonia nitrogen contained in the gas-liquid mixed water Rm is 0.3 mg / L, the nitrite nitrogen is 0.2 mg / L, and the nitrate nitrogen is 30 mg / L. There was (inspection method; pack test). The number of general bacteria in the circulation channel C, the rearing tank Fa, the sedimentation tank Dp, the physical filtration device Pf, the production device A, and the biological filtration device Bf was 30 to 70 individuals / mL (inspection method: JIS K 0101 63.2). (1998)).

The number of general bacteria in the gas-liquid mixed water Rm is 30 to 70 / mL, which is the same as the level of the sea area where the gas-liquid mixed water Rm is clean (for example, the general bacterial count is 2 to 96 (CFU / mL)). It can be said that it is a standard. The reason why the number of general bacteria can be suppressed within this range is considered to be that the bubbles of oxygen gas in the gas-liquid mixed water Rm have been nano-leveled. And it is judged that the gas-liquid mixed water Rm does not need to be sterilized by an ultraviolet sterilizer or the like. As a result, since there is no need to provide a sterilization apparatus such as an ultraviolet sterilizer in the aquaculture system Sy, the cost of the aquaculture system can be reduced accordingly.

・ There was little dirt in the rearing tank Fa and the piping equipment, and cleaning was very easy even if it was dirty. Therefore, it was found that the breeding water tank Fa can be used for a long period by circulating the gas-liquid mixed water Rm in which oxygen gas bubbles are nano-leveled.

¡Residual bait and dying fish decaying in the rearing tank Fa were delayed. From this, it was found that the gas-liquid mixed water Rm in which bubbles of oxygen gas are nano-leveled has an effect of preventing deterioration of water quality.

Sy aquaculture system A Gas-liquid mixed water generator C Circulation channel Fa Breeding tank Dp Precipitation tank Pf Physical filtration device Bf Biological filtration device Ta Temperature controller Pc Circulation pump Ox Oxygen supply source

Claims

A closed circulation filtration and aquaculture system in which a circulation tank that circulates breeding water with a circulation pump is provided with a breeding aquarium for breeding fish and shellfish and a biological filtration device for biological filtration of the breeding water discharged from the breeding aquarium Because
Gas-liquid mixing that produces gas-liquid mixed water by mixing oxygen gas with nano-sized bubbles in the circulation channel located downstream of the breeding tank and upstream of the biological filtration device. A water generator is installed,
The gas-liquid mixed water generated by the gas-liquid mixed water generating device and supplied to the biological filtration device is dissolved in supersaturated oxygen gas, and is biologically filtered by the biological filtration device and then supplied to the breeding aquarium. A closed circulation filtration aquaculture system characterized in that oxygen gas is dissolved in a supersaturated state in the gas-liquid mixed water.
2. A closed circulation filtration aquaculture system according to claim 1, wherein a physical filtration device is disposed in a portion of the circulation channel located immediately upstream of the gas-liquid mixed water production device.
The closed circulation filtration aquaculture system according to claim 1 or 2, wherein an air feeding device for feeding air is connected to the breeding tank and a biological filtration device using a submerged filter medium as a medium for nitrifying bacteria. .