JP3887329B2 - Seafood farming equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an aquaculture device for cultivating seafood in a breeding aquarium or temporarily cultivating it.
[0002]
[Prior art]
In the case of culturing seafood such as flounder in a breeding aquarium, conventionally, water is pumped into the breeding aquarium, and the water in the breeding tank is drained directly into the sea. It was common to do. In such a flow-through type aquaculture where natural water is pumped into a breeding aquarium and drained as it is, it is not necessary to treat ammonia generated by the aquaculture, and there is no need to supply oxygen into the water. This is advantageous in terms of profitability. However, since natural water is only pumped and supplied to the breeding tank, the temperature of the breeding tank depends on the season, and the growth of seafood is slow in the winter when the water temperature is low, and physiologically in the summer when the water temperature is high. There is a problem that feeding efficiency decreases and growth slows down. The optimum growth temperature is, for example, 20-24 ° C. for flounder, and 20-27 ° C. for queeze or okoze.
[0003]
Various systems have been proposed for rearing fish and shellfish in a completely closed circulation system that circulates while purifying the water in the rearing tank (see, for example, Patent Document 1 and Patent Document 2). In such a closed-circulation type aquaculture device, a solid path for removing solids in water, an ammonia removal tank for removing ammonia in water, and oxygen are supplied to the circulation path for circulating water in the breeding tank In addition to the oxygen supply device, the temperature of the water can be adjusted by providing a temperature controller. Therefore, in the winter season, the growth of water is prevented by slowing the growth by increasing the water temperature, and in the summer, by reducing the water temperature by cooling the water, the feeding efficiency is prevented from decreasing, and the growth rate of seafood is increased. It is possible to promote.
[0004]
[Patent Document 1]
JP 2000-31542 A [Patent Document 2]
Japanese Patent Laid-Open No. 2002-10724
[Problems to be solved by the invention]
However, adjustment of the water temperature is sufficient only in winter and summer, and there is no particular merit of adjusting the water temperature in other periods. Therefore, when water in the breeding aquarium is circulated in a closed circulation system even during periods when water temperature adjustment is not required, oxygen supply must be performed at all times. In addition, since the flushing method uses natural water as it is, it is advantageous in terms of profitability as described above. However, natural water may contain pathogenic bacteria, and if pathogenic bacteria enter the breeding aquarium, There is a risk that seafood will be annihilated.
[0006]
The present invention has been made in view of the above points, and in a period where water temperature adjustment is necessary, it is supplied to the breeding tank while purifying water in a closed circulation system, and a system in which natural water is poured during periods when water temperature adjustment is not required. The purpose of the present invention is to provide a seafood breeding device that can be fed to a breeding aquarium, can be advantageously bred in terms of profitability, and can prevent natural water pathogens from entering the breeding tank. To do.
[0007]
[Means for Solving the Problems]
The fish and shellfish breeding apparatus according to claim 1 of the present invention includes a breeding tank 1 for breeding seafood, a solid removal tank 2 for removing solids in water, and an ammonia removal tank 3 for removing ammonia in water. In the seafood aquaculture apparatus comprising a sterilization tank 4 for sterilizing water, a temperature regulator 5 for adjusting the water temperature, an oxygen supply device 6 for supplying oxygen to water, and a circulation pump 7, A closed circulation path 8 that circulates water through the solid pump 2, the ammonia removal tank 3, the sterilization tank 4, the temperature controller 5, and the oxygen supply device 6 by the action of the circulation pump 7, and natural water into the sterilization tank 4. It is provided with two switchable paths, a supply path 9 for supplying water to the breeding aquarium 1 and discharging water from the breeding tank 1, and a closed circulation path 8 and a flush path 9 according to the temperature of natural water. characterized by comprising as switching is performed It is intended to.
[0008]
The invention of claim 2 is characterized in that in claim 1, an ammonia removal tank 3 is formed by the biological filtration tank 10, and a pump 11 for circulating water containing ammonia in the biological filtration tank 10 is provided. Is.
[0009]
Further, the invention of claim 3 is that in claim 1, the ammonia removal tank 3 and the sterilization tank 4 are separated by an electrolysis tank 12 which removes ammonia with active chlorine species generated by electrolyzing water and sterilizes water. It is characterized by being formed.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below.
[0012]
1 and 2 show an example of an embodiment of the present invention, and both ends of a closed circulation path 8 are connected to a breeding aquarium 1 for breeding seafood. Along the flow direction of water from upstream to downstream in the closed circulation path 8, the solid matter removal tank 2, the biological filtration tank 10, the sterilization tank 4, the circulation pump 7, the oxygen supply device 6, and the temperature regulator 5 are arranged in this order. Connected. The solid matter removal tank 2 is formed by a sedimentation tank, a filter device, or the like, and is configured to physically separate and remove solid matter such as residual food, seafood droppings, and suspended solids (SS). . The sterilization tank 4 is provided with sterilization means such as ultraviolet irradiation, electrolysis, and ozone. The oxygen supply device 6 can be formed by an oxygen generator, a liquefied oxygen facility, a blower, or the like. The temperature regulator 5 is formed with a heat exchanger, a heater, and the like. In addition to these, a foam separating device, a pH adjusting device, and the like can be connected to the closed circulation path 8.
[0013]
In the embodiment of FIGS. 1 and 2, the ammonia removal tank 3 is formed by the biological filtration tank 10. The biological filtration tank 10 is partitioned into a plurality of chambers along the direction of water flow. For example, the first chamber 10a is a nitrification tank that nitrifies ammonia by the action of nitrifying bacteria, and the second chamber 10b contains ammonia. The denitrification tank, the third chamber 10c for reducing nitric acid produced by nitrification to nitrogen by the action of denitrifying bacteria and releasing it as nitrogen gas, is formed as a storage tank. The third chamber 10 c is provided with a pump 11 so that the water in the third chamber 10 c can be returned to the first chamber 10 a through the return path 16.
[0014]
As described above, by providing the closed circulation path 8 in the breeding aquarium 1, a closed circulation type aquaculture device can be formed. It is designed to form.
[0015]
That is, a pumping path 17 is branched and connected to a closed circulation path 8 between the breeding aquarium 1 and the solid matter removing tank 2, and the pumping path 17 pumps natural water such as marine seawater and fresh water of rivers and lakes ( (Not shown). The pumping path 17 is provided with an open / close valve 18, and the pumping path 17 is provided with a water temperature detection unit 19 formed with a temperature sensor or the like. This water temperature detector 19 is electrically connected to an operation switching control panel 20 formed by providing a control circuit. The closed circulation path 8 between the breeding water tank 1 and the solid matter removal tank 2 is provided with an opening / closing valve 21 upstream of the branching point of the pumping path 17.
[0016]
Further, a bypass path 23 is connected between the solid matter removal tank 2 and the sterilization tank 4, and by passing through the bypass path 23, the sterilization tank 4 does not pass through the biological filtration tank 10 from the solid matter removal tank 2. It is designed to allow water to flow through. Further, downstream of the sterilization tank 4, a water supply path 24 is branched and connected to a closed circulation path 8 between the sterilization tank 4 and the circulation pump 7, and the tip of the water supply path 24 is connected to the breeding water tank 1. The water supply passage 24 is provided with an opening / closing valve 25. An open / close valve 26 is provided in the closed circulation path 8 between the sterilization tank 4 and the circulation pump 7 on the downstream side of the branch point of the water supply path 24. Further, a drainage path 27 is branched and connected to the closed circulation path 8 between the breeding water tank 1 and the solid matter removal tank 2 at a position upstream of the opening / closing valve 21, and the opening / closing valve 28 is connected to the drainage path 27. It is provided.
[0017]
Each of the above open / close valves 18, 21, 25, 26, 28 is formed by an electromagnetic valve or the like and is electrically connected to the operation switching control panel 20. Further, the circulation pump 7 is also electrically connected to the operation switching control panel 20. A flushing passage 9 through which water flows in the order of the pumping passage 17, the solid matter removal tank 2, the bypass passage 23, the sterilization tank 4, the water supply passage 24, the breeding water tank 1, and the drainage passage 27 is a part of the closed circulation route 8. It is formed by using.
[0018]
In the aquaculture apparatus formed as described above, when operating in a closed circulation system, as shown in FIG. 1, the on-off valves 18, 25, 28 are closed and the on-off valves 21, 26 are opened to circulate. By operating the pump 7, the water in the breeding aquarium 1 is circulated through the closed circulation path 8. At this time, the bypass path 23 is closed (in the figure, the open on-off valve is shown in white, the closed on-off valve is shown in black, and the path through which water passes is shown by a solid line, The path through which water does not pass is indicated by a broken line). That is, the water in the breeding aquarium 1 passes through the opening / closing valve 21 and enters the solid matter removal tank 2 to remove the solid matter in the water, and then enters the biological filtration tank 10 to biologically remove the ammonia and organic matter in the water. Is done. Further, the water enters the sterilization tank 4 and is sterilized. The water thus purified and sterilized passes through the opening / closing valve 26 and flows through the closed circulation path 8 and is supplied with oxygen by the oxygen supply device 6, and then the water temperature is adjusted to the optimum temperature by the temperature regulator 5. . And water is returned to the breeding aquarium 1, and can be operated in a closed circulation manner in this way.
[0019]
Next, in the case of operating in the flow-through system, as shown in FIG. 2, the on-off valves 21 and 26 are closed and the on-off valves 18, 25 and 28 are opened to stop the operation of the circulation pump 7 and the pumping path. Operate 17 pumping pump. At this time, the path between the solid matter removal tank 2 and the biological filtration tank 10 is closed, and the solid matter removal tank 2 and the sterilization tank 4 are connected by the bypass path 23. The natural water pumped up through the pumping path 17 enters the solid matter removing tank 2 and the solid matter is removed, and then passes through the bypass path 23 and enters the sterilizing tank 4 to sterilize pathogenic bacteria in the water. The water sterilized in this way is supplied to the breeding aquarium 1 through the water supply channel 24, and excess water in the breeding aquarium 1 is discharged from the drainage channel 27. In this way, natural water can be pumped and supplied to the breeding aquarium 1 and can be operated by a pouring method in which water is discharged from the breeding aquarium 1, and natural water contains oxygen sufficiently. It is not necessary to supply oxygen from the oxygen supply device 6. Moreover, since natural water is sterilized in the sterilization tank 4, pathogenic bacteria and the like can be prevented from being brought into the breeding tank 1.
[0020]
Here, when operating in the pouring method, water containing ammonia or the like does not flow into the biological filtration tank 10, so that the activity was maintained using ammonia or the like as a bait when operating in the closed circulation method. The activity of bacteria such as nitrifying bacteria declines, and when switching from the flow-through operation to the closed-circulation operation, the start-up cannot be performed smoothly. Therefore, when operating in the pouring method, the pump 11 provided in the biological filtration tank 10 is operated, and water containing ammonia or the like is added to the biological filtration tank 10 while circulating the water in the biological filtration tank 10. By doing so, the activity of bacteria such as nitrifying bacteria is maintained. The addition of water containing ammonia or the like may be performed manually or automatically.
[0021]
3 and 4 show an example of another embodiment of the present invention. In this embodiment, instead of using the biological filtration tank 10 and the sterilization tank 4 as described above, an electrolysis tank 12 is used. I have to. The electrolysis tank 12 has functions of both an ammonia removal tank 3 for removing ammonia in water and a sterilization tank 4 for sterilizing water, and is connected to the downstream side of the solid matter removal tank 2 in the closed circulation path 8. It is. A post-treatment tank 30 is further connected to the closed circulation path 8 on the downstream side of the electrolysis tank 12. A water supply path 24 is branched and connected to the closed circulation path 8 between the electrolysis tank 12 and the post-treatment tank 30, and the tip of the water supply path 24 is connected to the breeding water tank 1. The water supply passage 24 is provided with an opening / closing valve 25. Other configurations are the same as those in FIGS. 1 and 2.
[0022]
The aquaculture device formed as described above mainly cultivates using seawater, and when operating in a closed circulation system, as shown in FIG. 3, the on-off valves 18, 25 and 28 are closed. The water in the breeding aquarium 1 is circulated through the closed circulation path 8 by opening the open / close valves 21 and 26 and operating the circulation pump 7. That is, the water in the breeding aquarium 1 passes through the opening / closing valve 21 and enters the solid matter removing tank 2 to remove the solid matter in the water, and then flows into the electrolysis tank 12.
[0023]
A pair of electrodes (not shown) to which a direct current is applied are arranged in the electrolysis tank 12, and when seawater flows into the electrolysis tank 12, it is electrolyzed, and the following reaction occurs near the anode electrode. Thus, active chlorine species such as hypochlorous acid are generated.
[0024]
Anode: Cl ⁻ + 2OH ⁻ → ClO ⁻ + H ₂ O
The generated active chlorine species such as hypochlorous acid react with ammonia contained in seawater to produce chloramine by the following reaction, and further, these chloramines react to liberate nitrogen. Then, a series of reactions of returning to chloride ions occurs, and the released nitrogen is discharged out of the system as nitrogen gas, whereby nitrogen components such as ammonia in seawater are removed.
[0025]
Chloramine formation: NH ₄ ⁺ + ClO ⁻ → NH ₂ Cl + H ₂ O
Nitrogen liberation: 2NH ₂ Cl + 2OH ⁻ → N ₂ + 2Cl ⁻ + 2H ₂ O
The above-mentioned hypochlorous acid generated by the electrolysis of seawater has a decolorizing action as known as a bleaching agent and is also a disinfectant, so that it can be sterilized simultaneously in the electrolysis tank 12. It is.
[0026]
Thus, the seawater from which ammonia has been removed and further sterilized in the electrolysis tank 12 passes through the post-treatment tank 30. The post-treatment tank 30 is formed as a chlorine removal tank that neutralizes chlorine with a chlorine neutralizing agent such as sodium thiosulfate or adsorbs and removes chlorine with activated carbon, and is not consumed in the reaction in the electrolysis tank 12. The surplus active chlorine species are removed, and the concentration of the active chlorine species is reduced to a concentration at which fish toxicity is exhibited or less. The water thus purified and sterilized passes through the opening / closing valve 26 and flows through the closed circulation path 8 and is supplied with oxygen by the oxygen supply device 6, and then the water temperature is adjusted to the optimum temperature by the temperature regulator 5. . And water is returned to the breeding aquarium 1, and can be operated in a closed circulation manner in this way.
[0027]
Next, in the case of operating in the flow-through method, as shown in FIG. 4, the on-off valves 21 and 26 are closed and the on-off valves 18, 25 and 28 are opened to stop the operation of the circulation pump 7 and the pumping path. Operate 17 pumping pump. The natural water pumped up through the pumping path 17 enters the solid matter removal tank 2 and after the solid matter is removed, enters the electrolysis tank 12 and sterilizes pathogenic bacteria in the water. The water sterilized in this way is supplied to the breeding aquarium 1 through the water supply channel 24, and excess water in the breeding aquarium 1 is discharged from the drainage channel 27. In this way, natural water can be pumped and supplied to the breeding aquarium 1 and can be operated by a pouring method in which water is discharged from the breeding aquarium 1, and natural water contains oxygen sufficiently. There is no need to supply oxygen from the oxygen supply device 6. Moreover, since natural water is sterilized in the electrolysis tank 12, pathogenic bacteria and the like can be prevented from being brought into the breeding tank 1. In addition, when operating by the pouring method, it is not necessary to remove ammonia in the electrolysis tank 12, and it is only necessary to be able to perform sterilization. Therefore, electrolysis in the electrolysis tank 12 is performed at a low voltage. The amount of residual chlorine is small. For this reason, it is possible to return the water from the electrolysis tank 12 directly to the breeding water tank 1 without having to pass it through the post-treatment tank 30.
[0028]
Here, when the ammonia removal tank 3 is formed by the biological filtration tank 10 as shown in FIG. 1, when water removal is started by passing water through the biological filtration tank 10, the nitrifying bacteria in the biological filtration tank 10. However, the electrolysis tank 12 can remove ammonia by electrochemical treatment, so that it does not require time for start-up. is there.
[0029]
5 and 6 show an example of another embodiment of the present invention, in which a biological filtration tank 10 and an electrolysis tank 12 are used in combination. In this device, the biological filtration tank 10 is connected to the closed circulation path 8 between the solid matter removal tank 2 and the electrolysis tank 12 of FIGS. 3 and 4, and the solid filtration tank 2 and the electrolysis tank 12 are connected to each other. A bypass path 23 is connected between them, and by passing through the bypass path 23, water can flow from the solid matter removal tank 2 to the electrolysis tank 12 without passing through the biological filtration tank 10. .
[0030]
When operating in a closed circulation system, as shown in FIG. 5, the open / close valves 18, 25, 28 are closed, the open / close valves 21, 26 are opened, the circulation pump 7 is operated, and the water in the breeding aquarium 1 is drained. It can be performed by passing the solid matter removal tank 2, the biological filtration tank 10, the electrolysis tank 12, the post-treatment tank 30, the oxygen supply device 6, and the temperature regulator 5 in this order and returning them to the breeding water tank 1. . Further, when operating in the pouring method, as shown in FIG. 6, the opening and closing valves 21 and 26 are closed and the opening and closing valves 18, 25 and 28 are opened to stop the operation of the circulation pump 7 and the pumping path 17. The pumping pump is operated to supply the natural water pumped up through the pumping path 17 to the breeding tank 1 through the solid matter removal tank 2 and the electrolysis tank 12, and the excess water in the breeding tank 1 is discharged from the drainage path 27. Can be done.
[0031]
In each of the above-described embodiments, the operation is performed in a closed circulation system in which the water in the breeding aquarium 1 is circulated through the closed circulation path 8, and in the flowing-in system in which natural water is supplied to the breeding aquarium 1 through the flush path 9. switching in this case, to perform in accordance with the temperature of the natural water detected by the water temperature detecting unit 19 provided in the pumping path 17. The optimal growth temperature is, for example, 20-24 ° C. in the Japanese flounder. Therefore, when the natural water temperature falls within this temperature range, the operation is switched from the closed circulation method to the pouring method, and the natural water temperature falls within this temperature range. When the temperature falls below or exceeds this temperature range, the operation is switched from the pouring method to the closed circulation method, and the temperature regulator 5 circulates while adjusting the water temperature to the above range. It is to make. For example, when the natural water temperature falls below 20 ° C, the operation is switched to the closed-circulation operation and the water is heated. When the natural water temperature rises to 23 ° C with a hysteresis of 3 ° C, the flow-through operation is performed. When the natural water temperature is 25 ° C or higher, switch to the closed-circulation operation to cool the water, and if the natural water temperature is 3 ° C or less and 22 ° C or lower, multiply it. The operation is switched to a sink operation. Of course, the temperature for switching between the closed circulation system and the flow-through system operation is set according to the fish species, and the water temperature adjustment immediately after switching to the closed circulation system is based on the water temperature before switching. It should be set to a level that does not put a burden on the seafood.
[0032]
In addition, the operation is automatically switched when the operation of the closed circulation system and the flowing-through system is switched according to the water temperature of the natural water detected by the water temperature detector 19 provided in the pumping path 17 as described above. Can be made. That is, the water temperature data detected by the water temperature detection unit 19 is input to the operation switching control panel 20, and if the input water temperature is within a preset water temperature range, the operation switching control panel 20 performs the control. The open / close valves 21, 26 are closed and the open / close valves 18, 25, 28 are opened to operate the pumping pump of the pumping path 17, and the operation is automatically switched to the flushing method. The input water temperature is preset. When the water temperature deviates from the water temperature, the open / close valves 18, 25, 28 are closed and the open / close valves 21, 26 are opened by the control from the operation switching control panel 20, and the circulation pump 7 is operated to switch the operation to the closed circulation system. . Needless to say, the location for detecting the temperature of natural water is not limited to the pumping path 17 as described above. In addition to switching the operation automatically as described above, the switching may be performed manually. Further, as described above, the operation may be switched according to the temperature of the natural water, or the operation may be switched according to the temperature change.
[0033]
In each of the above-described embodiments, the pouring path 9 includes the solid matter removing tank 2. However, if natural water has been clarified in advance by a filtration facility or the like, the pumping path 17 Is connected to the sterilization tank 4 or the electrolysis tank 12 so that natural water is not directly passed to the solid matter removal tank 2 but is directly guided to the sterilization tank 4 or the electrolysis tank 12 when operating in the pouring method. Also good.
[0034]
【The invention's effect】
As described above, the fish culture apparatus according to claim 1 of the present invention includes a rearing tank for rearing seafood, a solids removing tank for removing solids in water, and an ammonia removing tank for removing ammonia in water. And a culturing apparatus for seafood comprising a sterilization tank for sterilizing water, a temperature controller for adjusting the water temperature, an oxygen supply device for supplying oxygen to the water, and a circulation pump. A solid circulation removal tank, an ammonia removal tank, a sterilization tank, a temperature controller, a closed circulation path that circulates through the oxygen supply device, and a natural water is supplied to the breeding tank through the sterilization tank and the water in the breeding tank Since there are two switchable paths, the flowing water discharge path, the natural water is supplied to the breeding tank through the flowing water path when the natural water temperature is the optimum temperature for growth of seafood. Seafood When deviating from the optimum growth temperature, the water in the breeding aquarium can be circulated through the closed circulation route, and the water temperature can be kept at the optimum growth temperature with the temperature regulator, so that the breeding can be carried out advantageously in terms of profitability. In addition, when natural water is pumped up through the flow-through route, it can be supplied to the breeding tank after sterilization in the sterilization tank, and pathogens in the natural water can be prevented from entering the breeding tank. .
In addition, since the closed circulation route and the flushing route are switched according to the temperature of the natural water, when the natural water temperature is the optimum temperature for the growth of seafood, the natural water is supplied to the breeding tank through the flushing route. When the temperature of natural water deviates from the optimal temperature for growth of seafood, the water in the breeding aquarium is circulated through a closed circulation route, and the water temperature is maintained at the optimal temperature for growth using a temperature regulator. Can be cultured.
[0035]
Further, the invention of claim 2 is the invention according to claim 1, wherein an ammonia removal tank is formed by the biological filtration tank and a pump for circulating water containing ammonia in the biological filtration tank is provided. Even when the filtration tank is not used, activation of bacteria such as nitrifying bacteria in the biological filtration tank can be maintained, and the operation can be smoothly switched from the pouring method to the closed circulation method.
[0036]
According to a third aspect of the present invention, in the first aspect, an ammonia removal tank and a sterilization tank are formed by an electrolysis tank that removes ammonia and sterilizes water with active chlorine species generated by electrolyzing water. As a result, the system can be simplified by using both an ammonia removal tank and a sterilization tank in the electrolysis tank, and the electrolysis tank can remove ammonia by electrochemical treatment, and the startup time can be reduced. It becomes unnecessary.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing a state of operation in a closed circulation system in an example of an embodiment of the present invention.
FIG. 2 is a schematic diagram showing a state in which the operation is performed in a flowing manner in an example of an embodiment of the present invention.
FIG. 3 is a schematic diagram showing a state of operation in a closed circulation system in an example of another embodiment of the present invention.
FIG. 4 is a schematic view showing a state in which operation is performed in a pouring method in an example of another embodiment of the present invention.
FIG. 5 is a schematic view showing a state of operating in a closed circulation system in an example of still another embodiment of the present invention.
FIG. 6 is a schematic view showing a state in which the operation is performed in a pouring method in an example of still another embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Breeding tank 2 Solid matter removal tank 3 Ammonia removal tank 4 Sterilization tank 5 Temperature regulator 6 Oxygen supply device 7 Circulation pump 8 Closed circulation path 9 Overflow path 10 Biological filtration tank 11 Pump 12 Electrolysis tank

Claims (3)

A breeding aquarium for raising seafood, a solids removal tank for removing solids in water, an ammonia removal tank for removing ammonia in water, a sterilization tank for sterilizing water, a temperature controller for adjusting water temperature, In a seafood aquaculture device equipped with an oxygen supply device for supplying oxygen to the water and a circulation pump, the water in the breeding tank is turned into a solids removal tank, an ammonia removal tank, a sterilization tank, a temperature regulator, comprising a closed circulation path for circulating through the oxygenator, the over flow path for discharging the water in the breeding aquarium supplies breeding aquarium through the natural water the sterilization vessel, the two switching freely route, natural A fish culture device characterized in that a closed circulation path and a flushing path are switched according to the water temperature .   The fish culture apparatus according to claim 1, further comprising a pump that forms an ammonia removal tank by a biological filtration tank and circulates water containing ammonia in the biological filtration tank.   The fish and shellfish according to claim 1, wherein an ammonia removal tank and a sterilization tank are formed by an electrolysis tank that removes ammonia with active chlorine species generated by electrolyzing water and sterilizes water. Aquaculture equipment.

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