JP2019213460A - Growing device for aquatic organisms - Google Patents

Abstract

To provide a growing device for aquatic organisms capable of creating an environment having high dissolved oxygen concentration and little stream current.SOLUTION: There is provided a growing device comprising: a growing tank 11 for growing aquatic organisms; and a circulation tank 12 in which a liquid having high oxygen concentration is circulated. A gas transmission film 3 that transmits oxygen and does not transmit water is provided between the growing tank 11 and the circulation tank 12.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a device for growing aquatic organisms.

  2. Description of the Related Art In recent years, in aquaculture of aquatic organisms, a method of increasing the dissolved oxygen concentration by dissolving air or oxygen has been adopted in order to improve aquaculture efficiency by promoting growth and improving survival rate (for example, Patent Documents 1 and 2). reference).

  Conventional methods for raising the dissolved oxygen concentration include aeration using a diffuser tube, introduction of oxygen into a water supply water flow to a water tank using an ejector, and water supply of high-concentration oxygen-dissolved water using a gas dissolving device. In these methods, oxygen is dissolved and diffused by a water flow generated in a water tank.

JP 04237374 A JP 2013-255449 A

  By the way, the water flow in the aquarium is not considered a problem during the growth process from larvae to fry, juveniles, and adult fish.

  In the devices disclosed in Patent Literatures 1 and 2, since a water flow is generated to increase the dissolved oxygen concentration, it is not preferable to use the device for growing aquatic organisms in the process of growing up to larvae.

  Therefore, an object of the present invention is to provide an aquatic organism breeding apparatus capable of creating an environment with almost no water flow and a high dissolved oxygen concentration.

  An apparatus for growing aquatic organisms according to one embodiment of the present invention includes a growing tank for growing aquatic organisms, and a circulation tank that circulates water with a high oxygen concentration, between the growth tank and the circulation tank. And a gas permeable membrane that is permeable to oxygen and not permeable to water.

  According to the aquatic organism breeding apparatus having such a configuration, since the gas permeable membrane is provided between the breeding tank and the circulation tank, water moves from the circulating tank having a high oxygen concentration to the breeding tank. Oxygen moves without. For this reason, the oxygen concentration of the water in the growing tank can be increased, and since the water flow in the circulation tank does not flow into the growing tank, there is almost no water flow in the growing tank.

  In the aquatic organism growing apparatus having the above configuration, it is preferable that the circulation tank is provided below the growth tank via the gas permeable membrane.

  According to the aquatic organism breeding apparatus having such a configuration, the breeding tank and the circulation tank can be constructed with a simple configuration.

  In the aquatic organism breeding apparatus having the above-described configuration, an oxygen water circulating apparatus that circulates water having a high oxygen concentration in the circulating tank is provided.The oxygen water circulating apparatus has, for example, one end communicating with a part of the circulating tank. A circulation path having the other end communicated with the other part of the circulation tank, a gas introduction unit for introducing oxygen or a gas containing oxygen into the circulation path, a pressurizing pump provided in the circulation path, A gas dissolving device provided downstream of the gas inlet and the pressurizing pump and upstream of the circulation tank in the path.

  According to the aquatic organism breeding apparatus having such a configuration, water having a high oxygen concentration can be efficiently supplied to the circulation tank.

  In the aquatic organism breeding apparatus having the above configuration, the oxygen water circulation device includes an oxygen concentration detection unit that detects an oxygen concentration of water in at least one of the growth tank and the circulation tank, and at least one of the growth tank and the circulation tank. The apparatus may further include a controller that controls the amount of oxygen introduced by the gas introduction unit and the amount of pressurization by the pressurizing pump based on the oxygen concentration of one of the waters.

  According to the aquatic organism breeding device having such a configuration, the dissolved oxygen concentration in the breeding tank can be maintained at an oxygen concentration suitable for the aquatic organism to be grown.

  In the aquatic organism breeding apparatus having the above-described configuration, the controller may repeatedly change the number of revolutions of the pressurizing pump.

  According to the aquatic organism breeding apparatus having such a configuration, the gas permeable membrane can be repeatedly deformed in the film thickness direction by changing the water flow rate in the circulation tank. As a result, "fluctuation" can be caused in the growing tank.

  In the aquatic organism breeding apparatus having the above configuration, the oxygen water circulation device may further include a UV device that sterilizes circulating water on the circulation path.

  According to the aquatic organism breeding apparatus having such a configuration, since the circulating water is sterilized, the survival rate of aquatic organisms in the process of growing up to the larvae having weak vitality can be improved.

  ADVANTAGE OF THE INVENTION According to this invention, there is almost no water flow, and an environment with a high dissolved oxygen concentration can be created.

It is a schematic structure figure of an aquatic organism upbringing device concerning this embodiment. It is a control flow of the aquatic organism breeding device according to the present embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The aquatic organism breeding apparatus A according to the present embodiment includes a water tank 1 and an oxygen water circulation apparatus 2 as shown in FIG.

  The water tank 1 includes a growing tank 11 for growing aquatic organisms and a circulation tank 12 for circulating water having a high oxygen concentration. The gas permeable membrane 3 is provided between the growth tank 11 and the circulation tank 12. In the case of the example shown in FIG. 1, the water tank 1 is partitioned by the gas permeable membrane 3, the growth tank 11 is provided above the gas permeable membrane 3, and the circulation tank 12 is provided below the gas permeable membrane 3. You can also. The gas permeable film 3 may be any material as long as it is permeable to oxygen and not permeable to water. As the gas permeable film 3, for example, a silicon film having excellent oxygen permeability can be used. The “water having a high oxygen concentration” refers to water having a high oxygen concentration as compared with natural water, for example, water having an oxygen concentration of 10 ppm or more, preferably water having an oxygen concentration of 20 ppm or more. . The same applies to “water having a high oxygen concentration” described later.

  The attachment structure of the gas permeable membrane 3 to the water tank 1 is not particularly limited. For example, an upper container 111 having an opening and a flange 112 at a lower portion and a lower container 121 having an opening and a flange 122 at an upper portion are used. be able to. In this case, the gas permeable membrane 3 is fixed to the water tank 1 by fastening the fastening flanges 112 and 122 between the lower vessel 121 and the upper vessel 111 with bolts 13 or the like. At the same time, the water tank 1 is divided into upper and lower tanks. Preferably, in order to sufficiently secure the watertightness of the boundary between the upper container 111 and the lower container 121, the outer peripheral portion of the gas permeable membrane 3 is provided between the flange 112 of the upper container 111 and the flange 122 of the lower container 121. It is preferable to sandwich a flange packing (not shown) in an overlapping manner.

  The oxygen water circulation device 2 circulates water having a high oxygen concentration (hereinafter also referred to as “high-concentration oxygen water”) in the circulation tank 12. The oxygen water circulation device 2 includes a circulation path 21 for circulating high-concentration oxygen water, a gas introduction unit 24, a pressure pump 23, a gas dissolution device 25, an oxygen concentration detection unit 26, a UV device 27, and a controller. 28.

  The circulation path 21 is mainly configured using piping. One end 21 a of the circulation path 21 communicates with one lower side of the circulation tank 12, and the other end 21 b of the circulation path 21 communicates with another lower side of the circulation tank 12.

  The gas introduction unit 24 introduces pure oxygen (hereinafter, also simply referred to as “oxygen”) into circulating water flowing through the circulation path 21. When oxygen is introduced into the circulating water by the gas introducing unit 24, the circulating water becomes gas-liquid mixed water. In the present embodiment, pure oxygen is introduced into the circulating water, but a gas containing oxygen may be introduced into the circulating water instead of pure oxygen.

  In the present embodiment, the gas introduction unit 24 includes a gas supply path 241 that connects the oxygen supply source and the circulation path 21, a gas supply valve 242 provided in the gas supply path 241, and a gas supply valve 242. An actuator 243 for opening and closing is provided, and a check valve 244 provided downstream of the gas supply valve 242 on the gas supply path 241.

  The pressurizing pump 23 is provided in the circulation path 21 on the downstream side of the position where oxygen is introduced by the gas introduction unit 24 and on the upstream side of the circulation tank 12. When the pressure pump 23 is driven, water circulates along the circulation path 21. Note that the pressure pump 23 may be provided on the upstream side of the position where oxygen is introduced by the gas introduction unit 24.

  The gas dissolving device 25 is provided in the circulation path 21 on the downstream side of the pressure pump 23 and on the upstream side of the circulation tank 12. The gas dissolving device 25 includes a tank, and the gas-liquid mixed water is pressurized in the tank by the pressurizing pump 23, so that oxygen is pressurized and dissolved in the water. As a result, high-concentration oxygen water is generated in the tank. The high-concentration oxygen water generated in the tank is supplied to the circulation tank 21 through the circulation path 21. As the gas-liquid dissolving device 25, for example, a well-known device disclosed in JP-A-2011-235200, JP-A-2010-137176, and the like (referred to as “gas-liquid dissolving tank” in the same publication). ) Can be used.

  The oxygen concentration detection unit 26 is configured using an oxygen concentration sensor, and detects the oxygen concentration of the water in the growing tank 11.

  The UV device 27 sterilizes water circulating in the circulation path 21 using ultraviolet rays. In the present embodiment, the UV device 27 is provided between the gas-liquid dissolving device 25 and the circulation tank 12.

  The controller 28 controls the oxygen introduction by the gas introduction unit 24 based on the oxygen concentration of the water in the growth tank 11 detected by the oxygen concentration detection unit 26 in order to maintain the oxygen concentration of the water in the growth tank 11 at a desired concentration. The amount and the amount of pressure applied by the pressure pump 23 are controlled. Further, the controller 28 periodically changes the rotation speed of the pressurizing pump 23 to change the flow rate of water in the circulating tank 12 to generate “fluctuation” described later. The controller 28 can be configured using, for example, a sequencer.

  Next, circulation of water in the aquatic organism breeding apparatus A according to the present embodiment will be described. In the following, description will be made on the assumption that the water tank 1, the circulation path 21, and each device on the circulation path 21 are filled with water.

  When the pressurizing pump 23 is driven by the controller 28 and the gas introduction valve 242 of the gas introduction unit 24 is opened, water circulates along the circulation path 21 and oxygen is supplied to the gas introduction unit 24 with respect to the circulating water. Is introduced to generate gas-liquid mixed water. The generated gas-liquid mixed water is sent to the gas dissolving device 25 by the pressure pump 23. Further, by the pressurizing action of the pressurizing pump 23, the gas-liquid mixed water (mixed water of oxygen and water) is pressurized and dissolved in the water in the tank of the gas dissolving device 25. As a result, high-concentration oxygen water is generated. The generated high-concentration oxygen water is sent out from the gas-liquid dissolving device 25, sterilized by the UV device 27, and then sent into the circulation tank 12. On the other hand, from the other side of the circulation tank 12, water having a relatively low oxygen concentration (water in which oxygen has been consumed) is sent to the other end 21 b of the circulation path 21. The water having a relatively low oxygen concentration sent from the circulation tank 12 to the circulation path 21 passes through the gas introduction unit 24 and the gas dissolving device 25 to become high-concentration oxygen water again and is sent to the circulation tank 12. .

  When the high-concentration oxygen water is circulated and supplied to the circulation tank 12, the oxygen concentration in the water in the circulation tank 12 is significantly higher than the oxygen concentration in the growth tank 11, so that the oxygen in the high-concentration oxygen water in the circulation tank 12 is reduced. The gas passes through the gas permeable membrane 3 and moves to the growth tank 11, where the oxygen concentration of the water in the growth tank 11 increases.

  Further, the controller 28 constantly monitors the oxygen concentration of the growing tank 11 by the oxygen concentration detecting unit 26, and controls the circulation path 21 so that the oxygen concentration of the water in the growing tank 11 is maintained in a desired oxygen concentration range. The amount of pressurization by the pressurizing pump 23 and the amount of oxygen introduced by the gas introduction unit 24 are controlled for the flowing circulating water. An example of this control will be described with reference to FIG. In the following control example, the lower limit threshold of the oxygen concentration of the water in the growth tank 11 is set to Xppm, and the upper limit threshold is set to Yppm. Further, the valve openings A1 to A3 described later satisfy A3 <A1 <A2, and the pump rotation speeds N1 to N3 satisfy N3 <N1 <N2.

  First, the controller 28 determines whether or not the oxygen concentration of the water in the growth tank 11 detected by the oxygen concentration detecting unit 26 exceeds X ppm (S1), and determines that the oxygen concentration is X ppm or less. (S1: No), since the oxygen concentration of the water in the growth tank 11 is less than the desired range, the actuator 243 is drive-controlled so that the opening degree of the gas injection valve 242 becomes A2, and the pump rotation speed becomes N2. The pressurizing pump 23 is controlled so as to be (S2). In addition, when the opening degree of the gas injection valve 242 is already A2 and the pump rotation speed is N2, that state is maintained. After S2, the procedure returns to S1 again.

  In S1, when the controller 28 determines that the oxygen concentration of the water in the growing tank 11 exceeds X ppm (S1: Yes), then, the controller 28 determines whether the oxygen concentration of the water in the growing tank 11 is less than Y ppm. It is determined whether or not the oxygen concentration is less than Yppm (S3: Yes). If the oxygen concentration of the water in the growth tank 11 is within the desired range, the controller 28 determines whether the oxygen concentration of the gas input valve 242 is equal to or less than the desired value. The actuator 243 is controlled so that the opening degree becomes A1, and the pressurizing pump 23 is controlled so that the pump rotation speed becomes N1 (S4). In addition, when the opening degree of the gas injection valve 242 is already A1 and the pump rotation speed is N1, that state is maintained. After S4, the procedure returns to S1 again.

  When the controller 28 determines in step S3 that the oxygen concentration is equal to or higher than Y ppm (step S3: No), the controller 28 determines whether the oxygen concentration of the water in the growing tank 11 exceeds the desired range. The actuator 243 is controlled so that the opening of the valve 242 becomes A3, and the pressurizing pump 23 is controlled so that the pump rotation speed becomes N3 (S5). If the opening degree of the gas injection valve 242 is already A3 and the pump rotation speed is N3, that state is maintained. After S5, the procedure returns to S1 again.

  Further, the controller 28 changes the water flow rate in the circulation tank 12 by repeatedly changing the pump rotation speed of the pressurizing pump 23 up and down around the pump rotation speed N1, N2, or N3, thereby changing the gas permeable membrane. 3 is repeatedly deformed (up and down) in the film thickness direction. Thereby, “fluctuation” of water occurs in the growth tank 11. The “fluctuation” of water can provide a favorable breeding environment for aquatic organisms in the process of growing up to larvae. Regarding the "fluctuation" here, there is not a water flow but a "fluctuation" in the water, such as a depression at the bottom of the water, which is where spawning occurs in the real ecosystem of aquatic organisms. Can be made.

  As is apparent from the above description, according to the aquatic organism breeding apparatus A according to the present embodiment, the gas permeable membrane 3 is provided between the breeding tank 11 and the circulation tank 12, so that the oxygen concentration is high. Oxygen moves from the water in the circulation tank 12 to the growth tank 11, and the oxygen concentration in the water in the growth tank 11 can be increased to a desired value, and the oxygen concentration can be maintained. In addition, since the gas permeable membrane 3 is provided, the water flow in the circulation tank 12 does not enter the growth tank 11, and the water flow hardly occurs in the growth tank. Therefore, the breeding tank 11 provides a favorable breeding environment for aquatic organisms that are adversely affected by the water flow (for example, aquatic organisms that are growing up to larvae).

<Modification of Embodiment>
In the above-described embodiment, the oxygen concentration detection unit 26 detects the oxygen concentration of the water in the growing tank 11. Since they are linked to each other, the oxygen concentration of the water in the growing tank 11 can be estimated to some extent from the oxygen concentration of the water in the circulating layer 12. From this, the oxygen concentration of the water in the circulating layer 12 is detected by the oxygen concentration detecting unit 26, and the controller 28 determines the amount of oxygen introduced by the gas introducing unit 24 based on the oxygen concentration of the water in the circulating layer 12. By controlling the amount of pressurization by the pressure pump 23, the dissolved oxygen concentration in the growth tank 11 can be maintained in a desired range.

  The oxygen water circulating device for circulating the water having a high oxygen concentration in the circulation tank 12 is not limited to the oxygen water circulating device 2 described above. It is also possible to replace the oxygen water circulation device 2 according to the embodiment.

  The embodiment described above can be implemented in various other forms without departing from the spirit, gist, or main characteristics. Therefore, the above-described embodiment is merely an example in every aspect, and should not be interpreted in a limited manner.

  The present invention can be applied to, for example, an apparatus for growing aquatic organisms.

Reference Signs List A Aquatic organism growing device 2 Oxygen water circulating device 3 Gas permeable membrane 11 Growing tank 12 Circulating tank 21 Circulation path 23 Pressurizing pump 24 Gas introducing unit 25 Gas dissolving device 26 Oxygen concentration detecting unit 27 UV device 28 Controller

Claims (6)

A growing tank for growing aquatic organisms,
A circulation tank for circulating water with a high oxygen concentration,
With
A growing apparatus for aquatic organisms, wherein a gas-permeable membrane that transmits oxygen and does not transmit water is provided between the growing tank and the circulation tank. An aquatic breeding apparatus according to claim 1,
The cultivation apparatus for aquatic organisms, wherein the circulation tank is provided below the growth tank via the gas permeable membrane. An aquatic breeding apparatus according to claim 1 or 2,
Further provided with an oxygen water circulation device for circulating high oxygen concentration water in the circulation tank,
The oxygen water circulation device,
A circulation path having one end communicating with a part of the circulation tank and the other end communicating with another part of the circulation tank;
A gas introduction unit that introduces oxygen or a gas containing oxygen into the circulation path,
A pressure pump provided in the circulation path,
In the circulation path, a gas dissolving device provided downstream from the gas introduction unit and the pressure pump, and provided upstream from the circulation tank,
A growing apparatus for aquatic organisms, comprising: An aquatic breeding apparatus according to claim 3,
The oxygen water circulation device,
An oxygen concentration detection unit that detects the oxygen concentration of water in at least one of the growth tank and the circulation tank,
A controller that controls the amount of oxygen introduced by the gas introduction unit and the amount of pressurization by the pressurizing pump based on the oxygen concentration of water in at least one of the growth tank and the circulation tank,
A growing apparatus for aquatic organisms, further comprising: An aquatic breeding apparatus according to claim 3 or 4,
The aquatic organism breeding apparatus, wherein the controller repeatedly varies the number of revolutions of the pressurizing pump. An aquatic breeding apparatus according to any one of claims 3 to 5,
The oxygen water circulation device,
A breeding apparatus, further comprising a UV device that sterilizes circulating water on the circulation path.

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