JP3908177B2 - Aquaculture equipment for aquaculture - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for cultivating seafood, and more particularly to an aquaculture seawater circulation apparatus used for culturing seafood on land.
[0002]
[Prior art]
Conventionally, microorganisms and the like have been used as devices for culturing seafood using seawater (herein, “seawater” is a concept that includes not only natural seawater but also artificial seawater; the same shall apply hereinafter). Devices for purifying seawater are known. The device according to this prior art is usually configured to circulate seawater in a fish tank, and in the process of circulating the seawater, removal of excrement / residual food in seawater using microorganisms or the like. Etc. are done.
[0003]
Specifically, the apparatus according to the prior art is configured by providing a sedimentation tank, a foam separation tank, a nitrification tank, a denitrification tank, and the like in a circulation path when the seawater in the breeding aquarium is circulated. In the sedimentation tank, the removal of seafood excrement and residual food in seawater, in the foam separation device, the removal of proteins and suspended solids, in the nitrification tank, it is dissolved in seawater using microorganisms. In the decomposition and removal of ammonia and the denitrification tank, removal of nitrate nitrogen from seawater is performed.
[0004]
As described above, the apparatus according to the prior art performs purification processing using microorganisms by circulating seawater in order to keep the seawater in the breeding aquarium in a state suitable for aquaculture.
[0005]
[Problems to be solved by the invention]
In the above prior art, microorganisms are used to decompose ammonia or the like. Thus, the method using microorganisms is effective for human waste treatment and sewage treatment, but is not suitable for treatment in seawater (so-called salt concentration is high). That is, in the above-mentioned conventional technology, it is configured to perform treatment using microorganisms in seawater (salt water). However, since the ability to decompose microorganisms such as ammonia in seawater is low, There was a problem that high purification ability could not be expected. In addition, it is difficult to immediately proliferate microorganisms as the amount of treated water increases. Therefore, the apparatus according to the prior art has a problem that it cannot easily cope with fluctuations in the amount of treated water.
Furthermore, in the prior art, since microorganisms or the like are used, there is a problem that it is difficult to automatically control the apparatus according to the concentration of seawater.
[0006]
Therefore, the present invention has been made to solve the above-described problems of the prior art, and can efficiently decompose ammonia and the like in seawater and can easily cope with an increase in the amount of treated water. It is an object to provide a seawater circulation device for aquaculture that can realize automatic control.
[0007]
[Means for Solving the Problems]
  The present invention has been made in order to solve the above-described problems of the prior art, and the seawater in the aquaculture tank that is cultivating seafoodCirculateAn electrolytic means for performing an electrolytic treatment on the seawater is provided in a circulation path to be circulated, and the electrolytic means is configured to use a pair of electrodes and to distribute the seawater between the pair of electrodes substantially in parallel. ingA seawater circulation device for aquaculture, wherein a spacer capable of circulating the seawater is provided between the pair of electrodes, and the spacer performs electrolytic treatment on the seawater and promotes turbulence of the circulating seawater. A seawater circulation region capable of performing at least one of a diffuser portion and a nozzle portion.It is characterized by that.
[0008]
If it is the seawater circulation device for aquaculture constructed in this way, the microorganisms are not used for the decomposition treatment of ammonia in the seawater as in the prior art, and electrolysis is performed on the circulating seawater by the electrolysis means. Therefore, a strong redox reaction occurs in seawater, and ammonia can be completely decomposed. Moreover, if ammonia is decomposed by such a strong redox reaction, nitrous acid harmful to fish and shellfish is not generated, so that seawater suitable for aquaculture can be obtained. Furthermore, since the electrolysis means is used, even if the seawater concentration or the amount of treated water is increased or decreased, it is possible to easily cope with the increase and decrease by controlling the amount of current supplied to the electrolysis means. is there. Further, since the electrolysis means can adjust the ammonia decomposing ability in the electrolysis means only by changing the current in this way, it can be easily automated by combining with a concentration sensor or a flow meter. .
That is, according to the present invention, by using the electrolysis means, an aquaculture seawater circulation device that can efficiently decompose ammonia, easily cope with an increase in the amount of treated water, and realize automatic control of the device is obtained. be able to.
Furthermore, according to the seawater circulation device for aquaculture configured in this way, since the seawater is configured to circulate between the pair of electrodes, waste or fishery excrement contained in the seawater. Can be effectively prevented from adhering to the pair of electrodes (cathode and anode).
[0009]
  Also,As mentioned above,In the seawater circulation device for aquaculture according to the present invention, a spacer capable of circulating the seawater is provided between the pair of electrodes, and the spacer performs an electrolytic treatment on the seawater and disturbs the seawater that is distributed. Has a seawater distribution area that can promote fluidizationIs.
[0010]
  here,When the seawater is subjected to electrolytic treatment using the electrolysis means, magnesium and calcium in the seawater at the cathode interface become magnesium hydroxide and calcium hydroxide and adhere to the electrode or precipitate in the electrolysis means There is. Thus, when adhesion, precipitation, etc. of magnesium hydroxide etc. generate | occur | produce, it may cause the fall of electrolysis efficiency and may produce various malfunctions.
  However, aboveStructureAccording to the composition, in the seawater circulation region, in addition to the electrolytic treatment, turbulence is promoted with respect to the seawater, so that adhesion, precipitation, etc. of magnesium hydroxide and the like are less likely to occur, which effectively reduces the electrolytic efficiency. Can be prevented. In addition, if the turbulence of the seawater is promoted, it is possible to prevent adhesion and accumulation of dust, suspended matter, and other electrodes in the seawater.
[0011]
  Further, in the seawater circulation device for aquaculture according to the present invention, a diffuser portion that forms the seawater circulation region is provided in the vicinity of the seawater inflow portion of the spacer, and a nozzle portion that forms the seawater circulation region in the vicinity of the seawater outflow portion of the spacer The structure in which is provided is preferable.
[0012]
  Further, the present invention provides an electrolysis means for performing electrolysis treatment on the seawater in a circulation path for circulating the seawater in the aquaculture tank where the seafood is cultivated, and the electrolysis means uses a pair of electrodes. The aquaculture seawater circulation device configured to circulate the seawater between the pair of electrodes substantially in parallel, and can promote the turbulence of the circulated seawater between the pair of electrodes. A spacer having a fresh seawater circulation region is provided, a diffuser portion forming the seawater flow region is provided in the vicinity of the seawater inflow portion of the spacer, and a nozzle portion forming the seawater flow region is provided in the vicinity of the seawater outflow portion of the spacer. It is characterized by being provided.
[0013]
Moreover, in the seawater circulation device for aquaculture according to the present invention, it is preferable that a titanium electrode having a high hydrogen overvoltage is used as the cathode forming the pair of electrodes.
[0014]
In the aquaculture seawater circulation device according to the present invention, the current density of the cathodes forming the pair of electrodes is 0.5 A / dm during the electrolytic treatment.²~ 5A / dm²The structure which is is preferable.
[0015]
Moreover, in the seawater circulation device for aquaculture according to the present invention, the current density of the anodes forming the pair of electrodes is 10 A / dm during the electrolytic treatment.²~ 20A / dm²The structure which is is preferable.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a schematic configuration diagram of an aquaculture seawater circulation device according to an embodiment of the present invention.
[0017]
As shown in FIG. 1, the aquaculture seawater circulation device according to the present embodiment is configured to circulate seawater 1 a in the aquaculture tank 1 and perform purification treatment.
Specifically, after the seawater 1a in the culture tank 1 is taken out from the culture tank 1, the circulation pump 2 and the filtration device are circulated in the circulation path L1 for performing various treatments and circulating them again into the culture tank 1. 3, a foam separation tank 4, an electrolytic tank 5 (corresponding to “electrolysis means” of the present invention), and a retention tank 6 are provided to constitute a seawater circulation device for aquaculture. Seawater 1a in the aquaculture tank 1 is taken out of the aquaculture tank 1 using a circulation pump 2, and the filtration device 3, the foam separation tank 4, the electrolysis tank 5, and the retention tank 6 are discharged by the discharge pressure of the circulation pump 2. It is sent to each apparatus in order, and after being subjected to various processes to be described later in each apparatus, it is injected again into the aquaculture tank 1.
[0018]
The aquaculture tank 1 is configured to maintain an environment in which the seafood grows healthy. However, from the viewpoint of cost, as much fish as possible must be put into the aquaculture tank 1. There is. In this way, when a lot of seafood is introduced into the aquaculture tank 1, contact between the fish is inevitable, thereby peeling off the “slime substance” that covers the scales of the fish and serves as a protective film. As a result, suspended matter (SS), slime, and the like are generated in the culture tank 1 and cause contamination in the culture tank 1. Also, in the aquaculture tank 1, ammonia (NH), which is very toxic to fish and shellfish, is caused by decay of residual food and excrement._Three) May occur and may cause significant damage to the seafood in the aquaculture tank 1.
[0019]
The seawater circulation device for aquaculture according to the present embodiment circulates the seawater 1a in the aquaculture tank 1, and in the circulation process, removes the suspended matter and the like and decomposes and removes ammonia and the like. The seawater is kept in a state suitable for aquaculture.
Hereinafter, each component will be specifically described.
[0020]
The circulation pump 2 is configured to suck out the seawater 1 a in the culture tank 1 and discharge the sucked seawater 1 a to the downstream side of the circulation pump 2. In the aquaculture seawater circulation device according to the present embodiment, the circulation amount of the seawater 1a is determined according to the driving state of the circulation pump 2, and the seawater 1a passes through the circulation path L1 constituting the device by the discharge pressure of the circulation pump 2. Circulates.
[0021]
The filtration device 3 is a device that performs a filtration process on the seawater 1 a taken out from the culture tank 1. A large amount of sludge is generated in the seawater 1a of the aquaculture tank 1 due to decay of suspended matters, residual food, excrement, and the like. If various treatments are performed on the seawater 1a with these sludges, each device or the like cannot perform appropriate treatment. In particular, in the electrolytic cell 5 to be described later, it is difficult to appropriately decompose ammonia or the like while having such sludge.
Therefore, in the present embodiment, filtration processing using the filtration device 3 is performed as the first step when performing various treatments on the seawater 1a.
[0022]
Moreover, since the filtration apparatus 3 which comprises the seawater circulation device for aquaculture concerning this embodiment is continuously operated, it performs backwashing using a short time (2 to 3 minutes) to regenerate the filtration apparatus 3. It is configured to perform processing and improve durability (not shown). However, since it is a slime substance such as a slime substance that is filtered by the filtration device 3, the filtration performance of the filtration device 3 may not be restored only by backwashing. That is, during filtration using the filtration device 3, a slime-like substance or the like in the seawater 1 a covers the surface of the filtration aid that constitutes the filtration device 3, and thus in the gaps between the filtration aids. Since it will adhere, the filter aid (sand, diatomaceous earth, etc.) itself used to increase the filtration area will not function, and it will not be possible to regenerate such a state only by backwashing. Have difficulty.
[0023]
Therefore, in the present embodiment, in order to solve the above problem, a part of the seawater electrolyzed in the electrolytic cell 5 is filtered from the upstream side of the filtration device 3 using the partial circulation path L2. It is configured to be injected.
[0024]
Usually, the slime-like substance is an organic substance, and its surface has a large surface area, and the slime state is easily broken when it is brought into contact with a solution containing free chlorine. When the slime state is broken in this way, the slime-like substance is in a solution state that leaves only a small amount of precipitate, and the filter aid is not clogged. That is, according to the configuration of the present embodiment, the slime state of the slime-like substance in the filtering device 3 is broken by a part of the seawater injected through the partial circulation path L2, and the filter aid is clogged. Therefore, the ability of the filtration device 3 can be utilized to the maximum, the number of regenerations of the filtration device 3 can be greatly reduced, and the durability of the filtration device 3 can be improved.
[0025]
Further, as described above, a part of the seawater (solution containing free chlorine) is injected into the filtration device 3 to decompose and reduce the slime-like substance. According to the structure to provide, it becomes possible to implement | achieve the seawater circulation apparatus for aquaculture using a comparatively small filtration apparatus.
[0026]
Next, the foam separation tank 4 is provided in order to remove the bubbles of the seawater 1a to be circulated. In the seawater 1a in the culture tank 1 processed in this embodiment, since the organic substance which has a slime substance exists as mentioned above, the seawater 1a is easy to foam. Therefore, this foam separation tank 4 is provided to remove this foaming.
In addition, according to the structure which has the partial circulation path | route L2 mentioned above, slime is removed with the seawater which is returned via this partial circulation path | route L2 and inject | poured into the upstream of the filtration apparatus 3. FIG. In such a case, since foaming of the seawater 1a is suppressed, the foam separation tank 4 may be omitted as necessary (for example, according to the removal state of slime based on the return amount of seawater). Is possible.
[0027]
Next, the electrolytic cell 5 will be described. Here, FIG. 2 shows a schematic view of an electrolytic cell used in the present embodiment. FIG. 3 shows a plan view of the spacer constituting the electrolytic cell shown in FIG.
[0028]
As shown in FIG. 2, the electrolytic cell 5 constituting the aquaculture seawater circulation device according to the present embodiment includes a spacer 51 configured to introduce the seawater processed in the foam separation tank 4 into the electrolytic cell 5. A pair of electrodes (cathode 52, anode 53) for subjecting seawater flowing through the spacer 51 to electrolysis, a fixing plate 54 for supporting the anode 53, and the spacer 51 and the cathode 52 are provided. The first packing 55 and the second packing 56 provided between the spacer 51 and the fixed plate 54 are used. In addition, in this embodiment, you may provide a casing etc. so that the electrolytic vessel 5 shown in FIG. 2 may be included as needed.
[0029]
The spacer 51 is provided with a seawater inflow portion 511 and a seawater outflow portion 512 that are connected to the circulation path L1 so that seawater flows in and out. A circulation path L1 is connected to the seawater inflow portion 511 so that seawater that has passed through the foam separation tank 4 flows into the electrolytic cell 5, and the seawater that has been treated in the electrolytic cell 5 is retained in the seawater outflow portion 512. A circulation path L1 is connected to the tank 6 for conveyance.
[0030]
In addition, the spacer 51 is provided with a seawater circulation region 513 that applies electrolytic treatment to seawater to promote turbulence of the circulating seawater. In the present embodiment, as shown in FIG. 3, a substantially hexagonal seawater circulation region 513 is formed through the spacer 51. The seawater circulation region 513 has a tapered diffuser portion 513 a at a portion in contact with the seawater inflow portion 511 and a tapered nozzle portion 513 b at a portion in contact with the seawater outflow portion 512.
[0031]
In the present embodiment, a pair of electrodes (a cathode 52 and an anode 53) are provided in order to subject the seawater flowing through the seawater circulation region 513 to electrolysis. In the present embodiment, an appropriate current is supplied to the pair of electrodes 52 and 53 according to a control signal from a control unit (not shown). That is, the flow rate of seawater processed in the electrolytic cell 5 is controlled and managed by the control unit, and an electric current is applied to the electrodes 52 and 53 in the electrolytic cell 5 in order to cope with the change in the amount of processed seawater. Supplied.
[0032]
The cathode 52 is laminated and attached to the spacer 51 via the first packing 55, and the first packing 55 has seawater circulation in order to bring the surface of the cathode 52 into contact with seawater flowing in the seawater circulation region 513. A through hole (see FIG. 3) having the same shape as the region 513 is formed.
Here, as a material for forming the cathode 52, for example, metal titanium or a material having a high hydrogen overvoltage is used.
[0033]
The current density of the cathode 52 is 0.5 A / dm.²~ 5A / dm²It is preferable to set within the range. This is because, within the above range, the current density is relatively low, so that it is possible to prevent the formation of hydroxyl groups on the cathode surface and the formation of adhesion of magnesium hydroxide or calcium hydroxide to the cathode 52. is there. The current density of the cathode 52 is 1 A / dm.²~ 4A / dm²It is more preferable to set within the range. If the current density is set too high, the production of magnesium hydroxide and calcium hydroxide increases, and these produced substances adhere to the cathode 52. Also, if the current density is set too high, the pH in the seawater will be lowered gradually from 8 to 8.3 and will be inclined to the acidic side, resulting in a change in the composition of the circulating seawater, May cause damage. Furthermore, if the current density is set too low, the relationship between the size of the electrode area and the counter electrode (anode 53) (in this embodiment, the electrode area is such that cathode 52> anode 53 (see FIG. 2)). This results in a partial (concentrated) current distribution, and the electrolysis efficiency decreases. Therefore, in the present embodiment, it is preferable to appropriately set the current density within the above-described range as necessary.
[0034]
The anode 53 is attached to the spacer 51 via a fixing plate 54 and a second packing 56, and the fixing plate 54 and the second packing 56 have a through hole through which the attachment portion 53 a of the anode 53 can pass. Is formed. That is, the anode 53 is attached to the spacer 51 with its surface exposed on the second packing 56 so as to be in contact with the seawater circulating in the seawater circulation region 513.
Here, as the anode 53, for example, a surface of metal titanium on which a white metal oxide such as Pt, Ir, Pd, or Ru is baked is used.
[0035]
The current density of the anode 53 is 10 A / dm²~ 20A / dm²It is preferable to set within the range. This is because the current can be supplied up to the limit current density within the above range. However, in this setting range, the optimum current density is determined by conditions such as concentration, and more preferably 12 A / dm.²~ 17A / dm²It is set within the range of. If the current density is set too high, the life of the electrode is short and the amount of gas generated increases, resulting in poor efficiency. On the other hand, if it is too low, the decomposition process cannot be performed properly. Therefore, appropriate settings are made within the above-described range as necessary.
[0036]
Now, the electrolysis (electrolysis) process performed with respect to seawater in the electrolytic tank 5 comprised as mentioned above is important also in the various processes performed with the seawater circulation apparatus for culture concerning this embodiment. Specifically, ammonia is decomposed and decolored by electrolyzing the seawater introduced into the electrolytic cell 5. In this electrolytic cell 5, ammonia is decomposed and nitrogen gas (N₂The nitrogen gas is discharged through a gas-liquid separator (not shown), a gas exhaust pipe (not shown), and the like, whereby ammonia is completely decomposed. Hereinafter, ammonia (NH_Three) Will be described in detail.
[0037]
In the electrolytic cell 5, ammonia (NH_Three) Is as follows.
2NH_Three+ 3NaClO → 3H₂O + 3NaCl + N₂↑
[0038]
In the above reaction formula, the reaction is represented by the reaction between sodium hypochlorite and ammonia. However, the decomposition reaction of ammonia in the electrolytic cell 5 is only oxygen (O) or chlorine (Cl₂) It is thought that a strong reaction proceeds by oxidation. That is, if the electrolytic cell 5 is used, ammonia can be completely decomposed by a strong oxidation-reduction reaction.
[0039]
In addition, there is no example in which ammonia is easily completely decomposed in a device using a so-called microorganism according to the prior art, and it is extremely difficult for fish and shellfish to cause a weak redox reaction different from the above-described reaction. Highly toxic nitrous acid (NO₂) Will be generated and will cause damage to seafood. By the way, the effect of nitrous acid is that the fish stops eating food at 3 mg / L, and the fish dies at 15 mg / L.
[0040]
Seawater from which ammonia has been completely decomposed and nitrogen has been released is transported to the retention tank 6 through the circulation path L1 after the treatment in the electrolytic tank 5 is completed. In the present embodiment, since seawater is sent from the circulation path L1 to the staying tank 6 in a showering state, it is possible to further expel nitrogen gas or the like in seawater and increase necessary oxygen.
[0041]
Moreover, in this residence tank 6, the residual free chlorine in seawater is reduced using a reducing agent, and the free chlorine is removed. Examples of the reducing agent (dechlorination agent) include sodium sulfite and hydrogen peroxide. About the removal of the free chlorine in this residence tank 6, chemical injection control can be performed using a residual chlorine meter or the like. That is, it is possible to realize automation of removal of free chlorine in the residence tank 6 by configuring so that an appropriate reducing agent can be introduced based on the measurement value obtained by the residual chlorine meter.
[0042]
Then, the seawater from which free chlorine has been removed in the retention tank 6 is again injected into the culture tank 1. That is, the seawater 1a in the aquaculture tank 1 is returned to the aquaculture tank 1 again after the removal of sludge, ammonia, etc. in the seawater using the aquaculture seawater circulation device according to this embodiment, Used for aquaculture.
[0043]
Since the aquaculture seawater circulation apparatus according to the present embodiment is configured as described above, the following effects can be obtained.
[0044]
First, since the aquaculture seawater circulation apparatus according to the present embodiment uses the electrolytic cell 5 for decomposing ammonia and the like, there is a change in seawater contamination (for example, ammonia concentration) or seawater flow rate. Even so, the current supplied to the electrodes 52 and 53 constituting the electrolytic cell 5 can be changed to easily cope with the fluctuation.
Further, since it is possible to easily perform control only by changing the current supplied to the electrolytic cell 5, automatic control can be easily performed in combination with a concentration sensor or the like. Furthermore, according to the electrolytic treatment using the electrolytic cell 5 according to the present embodiment, since the oxidizing power is very strong, ammonia can be completely decomposed into nitrogen, and by releasing the nitrogen, The ammonia can be completely decomposed and removed. In addition, even if some nitric acid is generated by long-term use, the oxidant power is strong, so that nitrous acid that adversely affects fishery products is not produced.
[0045]
Moreover, in the aquaculture seawater circulation apparatus according to the present embodiment, it is configured to return a part of the seawater treated in the electrolytic cell 5 to the upstream side of the filtration device 3 and inject it into the filtration device 3. As described above, the slime-like substance can be decomposed, and clogging of the filtration device 3 can be prevented. Furthermore, according to such a configuration, slime-like substances are reduced, and thus the size of the filtration device 3 can be reduced. Moreover, since the foaming of seawater is suppressed by reducing the slime-like substance when a part of the seawater is circulated, the foam separation tank 4 can be downsized or omitted.
[0046]
Furthermore, according to this embodiment, since it is comprised so that seawater distribute | circulates between the electrodes 52 and 53 in the electrolytic cell 5 substantially in parallel (from the bottom to the top), the waste contained in seawater or Adhesion of seafood excrement to the electrodes 52 and 53 can be effectively prevented.
[0047]
In addition, when an apparatus that performs electrolytic treatment on seawater or the like is continuously used, magnesium hydroxide crystals may adhere to the surface of the cathode or the like in the electrolytic cell.
However, in this embodiment, since the seawater circulation region 513 is provided in the electrolytic cell 5 in order to improve the distribution state of seawater (to promote turbulence), adhesion of magnesium hydroxide crystals and the like is prevented. It can be effectively prevented.
More specifically, in this embodiment, the Reynolds number (Re = v (speed ) × d (inner diameter) / ν (kinematic viscosity coefficient)) to increase turbulence. Moreover, by providing the nozzle part 513b in the seawater derivation part in the seawater circulation region 513, the Reynolds number (Re) can be increased and turbulence can be promoted by increasing the circulation speed of the seawater.
[0048]
The present invention is not limited to the above-described embodiment, and various modifications other than those described above can be made without departing from the spirit of the present invention.
[0049]
For example, in the above embodiment, the case where the seawater circulation region has a substantially hexagonal shape has been described as shown in FIG. 3, but the present invention is not limited to this configuration. Any shape may be used as long as the promotion can be appropriately performed. Therefore, for example, the seawater circulation region can have various shapes such as a rhombus, a rectangle, and an ellipse.
[0050]
Moreover, in the said embodiment, although the case where the electrolytic cell 5 was comprised so that seawater distribute | circulated between the electrodes 52 and 53 upwards from the downward direction was demonstrated, this invention is not limited to this structure, seawater is an electrode. As long as it distribute | circulates between 52 and 53 substantially parallel, you may comprise an electrolytic cell so that seawater may distribute | circulate to a horizontal direction as needed.
[0051]
【The invention's effect】
As described above, according to the present invention, the electrolysis means (electrolysis tank) is used for the decomposition of ammonia and the like, and therefore ammonia in seawater and the like can be efficiently decomposed to easily cope with an increase in the amount of treated water. At the same time, it is possible to obtain an aquaculture seawater circulation device capable of realizing automatic control of the device.
In addition, by using the electrolysis means, it is possible to delete the constituent elements essential in the prior art as described above, so that it is possible to reduce the size and space of the aquaculture seawater circulation device as a whole. it can. Furthermore, since the treatment can be performed without being influenced by microorganisms or the like, it is possible to obtain an aquaculture seawater circulation device that is easy to manage and can realize a stable operation.
Furthermore, since a seawater circulation region that can promote turbulent flow is provided in the electrolysis means (electrolyzer), it is possible to reduce the amount of substances (magnesium hydroxide crystals, etc.) attached to the electrodes constituting the electrolyzer. Thus, the aquaculture seawater circulation device can be continuously operated appropriately.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of an aquaculture seawater circulation device according to an embodiment of the present invention.
FIG. 2 is a schematic view of an electrolytic cell constituting the aquaculture seawater circulation device according to the present embodiment.
FIG. 3 is a schematic view of a spacer constituting the electrolytic cell shown in FIG.
[Explanation of symbols]
1 ... Aquaculture tank
2 ... circulation pump
3 ... Filtration device
4 ... Foam separation tank
5 ... Electrolysis tank
6 …… Retention tank
DESCRIPTION OF SYMBOLS 51 ... Spacer, 52 ... Cathode, 53 ... Anode, 54 ... Fixing plate, 55 ... First packing, 56 ... Second packing, 511 ... Seawater inflow part, 512 ... Seawater outflow part, 513 ... Seawater circulation area, 513a ... Diffuser Part, 513b ... nozzle part
L1 ... circulation route
L2 ... Partial circulation route

Claims (6)

Seawater aquaculture tank that farmed seafood in the circulation path for circulating the electrolytic means for performing an electrolytic treatment to the seawater provided, the electrolytic unit, a pair of electrodes, the pair of electrodes A seawater circulation device for aquaculture configured such that the seawater circulates substantially in parallel ,
A spacer having a seawater circulation region capable of promoting turbulence of the circulating seawater is provided between the pair of electrodes,
The seawater circulation device for aquaculture , wherein at least one of a diffuser part and a nozzle part is provided in the seawater circulation region . The spacer diffuser portion near seawater inlet forms the seawater flow region is provided for aquaculture seawater according to claim 1 in which the nozzle portion is provided which forms the seawater flow area in the vicinity of sea water outlet portion of the spacer Circulation device. In the circulation path for circulating the seawater in the aquaculture tank where the seafood is cultivated, an electrolytic means for subjecting the seawater to electrolytic treatment is provided, and the electrolytic means uses a pair of electrodes, and between the pair of electrodes. A seawater circulation device for aquaculture configured to distribute the seawater substantially in parallel,
Between the pair of electrodes, a spacer having a seawater circulation region capable of promoting turbulence of the circulating seawater is provided,
A diffuser portion that forms the seawater circulation region is provided near the seawater inflow portion of the spacer, and a nozzle portion that forms the seawater circulation region is provided near the seawater outflow portion of the spacer.
A seawater circulation device for aquaculture. The aquaculture seawater circulation device according to any one of claims 1 to 3 , wherein a titanium electrode having a high hydrogen overvoltage is used as a cathode forming the pair of electrodes. Wherein during electrolysis, the current density of the cathode forming a pair of electrodes, aquaculture seawater circulation apparatus according to claim 1, any one of 4 is ^{0.5A / dm 2 ~5A / dm 2} . Wherein during electrolysis, the current density of the anode forming the pair of electrodes, aquaculture seawater circulation apparatus according to claim 1, any one of 5 is ^{10A / dm 2 ~20A / dm 2} .

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