JP3840246B2 - Closed circulation culture system and pH adjusting device - Google Patents

Description

  The present invention is a closed circulation in which seafood (including artificial seawater) is circulated in a closed system and reused on land, while culturing and temporarily raising seafood in a breeding aquarium. The present invention relates to an aquaculture system and a pH adjusting device.

  Conventionally, a closed-circulation aquaculture system for breeding edible or appreciating seafood at a land point remote from the sea surface has been studied. In this closed-circulation aquaculture system, it is necessary to perform the process of removing the excrement and residual food of the reared fishery products from the rearing aquarium without using dilution in the surrounding environment.

  For this purpose, a purification circulation path that circulates seawater is connected to the breeding aquarium, and a physical filtration device and a biological septic tank are provided in this circulation path. Purifies seawater by removing solids such as bait by filtering them with a physical filtration device, and nitrifying and removing ammonia resulting from seafood excrement in microorganisms such as nitrifying bacteria in a biological septic tank (See, for example, Patent Document 1).

In this way, when ammonia in seawater caused by seafood excrement is removed by nitrification with microorganisms such as nitrifying bacteria, the pH of seawater decreases due to the formation of nitric acid components, and the breeding environment for seafood is Getting worse. Therefore, in order to prevent a decrease in pH, an alkaline agent is added to seawater to adjust the pH.
Japanese Patent Laid-Open No. 11-225616

  Sodium carbonate, sodium hydroxide, calcium carbonate, etc. are used as the alkali agent, but the sodium and calcium in the alkali agent are accumulated in the seawater in the closed circulation system, the salinity rises, the balance of seawater ion components There was a risk of a loss of fish and seafood breeding. For this reason, it was difficult to continue the cultivation without exchanging the seawater in the closed circulation system.

  The present invention has been made in view of the above points, and is a closed-circulation aquaculture system capable of adjusting pH without using an alkaline agent and capable of culturing seafood without having to exchange seawater. Further, it is an object of the present invention to provide a pH adjusting device capable of adjusting pH without using an alkali agent.

  The closed-circulation aquaculture system according to claim 1 of the present invention is a closed-circulation aquaculture system in which the seawater S in the breeding aquarium 1 is circulated while purifying and the seafood is raised in the breeding aquarium 1. An electrolytic chamber 5 for electrolyzing the seawater S supplied from the breeding aquarium 1, and active chlorine in the seawater S supplied from the anode chamber 4 as a carbonizer 6. The neutralization tank 7 for neutralization, the space part 14 above the water surface communicates with the space part 15 above the water surface in the neutralization tank 7, and the chlorine removal tank 16 in which water W is stored, and the neutralization tank 7 is mixed with the air diffuser tube 8 that aspirates the air in the space 15 in the chlorine removal tank 16 by a jet, the seawater S supplied from the cathode chamber 4 and the seawater S supplied from the neutralization tank 7. And a pH adjusting device comprising a mixing tank 9 to be returned to the breeding water tank 1. It is an butterfly.

  Further, the invention of claim 2 is that in claim 1, the diaphragm 2 of the electrolytic cell 5 is formed of a cation exchange membrane, and the amount of water passing through the anode chamber 3 is reduced to 1/20 or less of the amount of water passing through the cathode chamber 4. It is characterized by being set.

  In addition, the invention of claim 3 is characterized in that in claim 1 or 2, the chlorine removal tank 16 is connected to a pressure adjusting tank 19 opened to the outside above the water surface by a communicating water channel 18 through which water flows. It is a feature.

  The invention of claim 4 is characterized in that, in any one of claims 1 to 3, a stirring pump 10 for stirring the carbonizing agent 6 in the neutralization tank 7 is provided.

  According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the electrode switching means 11 for switching the anode and the cathode of the chamber partitioned by the diaphragm 2 in the electrolytic cell 5, and the anode of the electrolytic cell 5 from the breeding water tank 1 Channel switching means 12 for switching the channel for supplying seawater S to chamber 3 and cathode chamber 4, and the channel for supplying seawater S from anode chamber 3 and cathode chamber 4 to neutralization tank 7 and mixing tank 9 are switched. The flow path switching means 13 is provided.

  A sixth aspect of the present invention is the flow according to any one of the first to fifth aspects, comprising a plurality of neutralization tanks 7 for switching a flow path for supplying seawater S from the anode chamber 3 to any one of the plurality of neutralization tanks 7. It is characterized by comprising a path switching means 17.

  The pH adjusting device according to claim 7 of the present invention includes an anode chamber 3 and a cathode chamber 4 partitioned by a diaphragm 2, an electrolytic cell 5 for electrolyzing seawater S, and seawater S supplied from the anode chamber 4. Chloride in which water W is stored by the neutralization tank 7 for neutralizing the active chlorine therein with the carbonizing agent 6 and the space part 14 above the water surface communicated with the space part 15 above the water surface in the neutralization tank 7. A removal tank 16, an air diffuser tube 8 for aerating the air in the space 15 in the neutralization tank 7 into the water W of the chlorine removal tank 16, seawater S supplied from the cathode chamber 4, and the neutralization tank 7 It comprises the mixing tank 9 which mixes the seawater S supplied from.

  When the seawater S is electrolyzed in the electrolytic cell 5, the seawater S becomes acidic in the anode chamber 3 partitioned by the diaphragm 2, the seawater S becomes alkaline in the cathode chamber 4, and the chlorine in the acidic seawater S in the anode chamber 3 A part of the water is vaporized in the space 15 of the neutralization tank 7 and is dissolved and removed in the water W by aeration by the diffuser pipe 8 in the chlorine removal tank 16. The pH of the seawater S in the neutralization tank 7 is To rise. When the seawater S supplied from the neutralization tank 7 and the seawater S supplied from the cathode chamber 4 of the electrolytic tank 5 are mixed in the mixing tank 9, the pH of the mixed seawater S is the pH of the seawater S before electrolysis. It can be further increased and the pH can be adjusted.

  Therefore, by returning the seawater S adjusted in pH by mixing in the mixing tank 9 to the breeding aquarium 1, the pH of the seawater S in the breeding aquarium 1 can be adjusted without using an alkaline agent. Therefore, it is possible to cultivate seafood without having to exchange seawater S.

  Hereinafter, the best mode for carrying out the present invention will be described.

  FIG. 1 shows an example of an embodiment of the present invention, and a water purification tank 20 and a pH adjustment circulation path 21 are connected to a breeding aquarium 1 where fish and shellfish are raised. A circulation pump 22, a filtration tank 23, and a biological purification tank 24 are connected to the water purification circulation path 20 in the order along the flow of water, and the seawater S in the breeding tank 1 is transformed into the filtration tank 23 and the biological organism by the action of the circulation pump 22. It is made to circulate through the purification | cleaning circulation path | route 20 so that it may return to the breeding water tank 1 after passing the septic tank 24. FIG. Solid matter such as seafood excrement and residual food is filtered and removed in the filtration tank 23, and ammonia resulting from seafood excretion is nitrified and removed by microorganisms such as nitrifying bacteria in the biological septic tank 24. The seawater S in the breeding aquarium 1 is purified.

  On the other hand, in the pH adjusting circulation path 21, an electromagnetic switching valve 12 a constituting the flow path switching means 12, the electrolytic cell 5, an electromagnetic switching valve 13 a constituting the flow path switching means 13, the neutralization tank 7, The mixing tank 9 is connected in the order along the flow of water to form the pH adjusting device 100, and a circulation pump for circulating the seawater S of the breeding aquarium 1 at an appropriate position of the pH adjusting circulation path 21. (Not shown) is connected.

  The chamber of the electrolytic cell 5 is partitioned by the diaphragm 2 to form two chambers, and electrodes 25a and 25b are arranged in the respective chambers. A DC power supply 28 is connected to the electrodes 25a and 25b. The chamber in which the electrode 25a set as the anode is arranged is the anode chamber 3, and the chamber in which the electrode 25b set as the cathode is arranged is the cathode chamber 4. It is. The pH adjusting circulation path 21 between the switching valve 12a and the electrolytic cell 5 is formed by two parallel flow paths 26a and 26b. One flow path 26a is connected between the switching valve 12a and the anode chamber 3, and the other. Are connected between the switching valve 12a and the cathode chamber 4, respectively. The pH adjusting circulation path 21 between the electrolytic cell 5 and the switching valve 13a is formed by two parallel flow paths 27a and 27b, and one of the flow paths 27a is provided between the anode chamber 3 and the switching valve 13a. The other flow path 27b is connected between the cathode chamber 4 and the switching valve 13a. Further, the pH adjusting circulation path 21 downstream from the switching valve 13 a is branched into two parallel flow paths 31 a and 31 b, and one flow path 31 a is connected to the upper part of the neutralization tank 7. The other flow path 31 b is connected to the mixing tank 9, and a flow path 32 forming a part of the pH adjusting circulation path 21 is connected between the lower part of the neutralization tank 7 and the mixing tank 9.

  Seawater S is supplied into the neutralization tank 7 from the anode chamber 3, and a granular carbonizing agent 6 such as activated carbon is placed in a state of being immersed in the seawater S. A stirring pump 10 is connected to the neutralization tank 7, and the seawater S in the neutralization tank 7 is agitated by circulating the pumping-out of the seawater S in the neutralization tank 7. . One end of the air supply path 35 is connected so as to open into the space 15 above the water surface of the seawater S in the neutralization tank 7.

  A chlorine removal tank 16 is disposed adjacent to the neutralization tank 7, and water W such as tap water is placed in the chlorine removal tank 16. A diffuser tube 8 is disposed in the chlorine removal tank 16 so as to be immersed in the water W, and the other end of the air supply path 35 is connected to the diffuser tube 8. An air pump 29 is provided in the middle of the air supply path 35, and the air in the space 15 of the neutralization tank 7 is sucked by the air pump 29 and discharged from the diffuser pipe 8 into the water W. Moreover, the neutralization tank 7 and the chlorine removal tank 16 are opened so that one end and the other end are open to the space part 15 in the neutralization tank 7 and the space part 14 above the surface of the water W in the chlorine removal tank 16. A communication air passage 37 is connected between the two. The neutralization tank 7 and the chlorine removal tank 16 are formed in a sealed structure, and the sealed space portion 15 of the neutralization tank 7 and the sealed space portion 14 of the chlorine removal tank 16 are connected via this communication air passage 37. A sealed space that communicates is formed.

  A pressure adjusting tank 19 is disposed adjacent to the chlorine removing tank 16, and water W is placed in the pressure adjusting tank 19. A communication channel 18 is connected between the bottom of the chlorine removal tank 16 and the pressure adjustment tank 19 below the surface of the water W, and an opening 30 is provided above the pressure surface of the water W above the pressure adjustment tank 19. Opened. Therefore, the water W in the chlorine removal tank 16 and the water W in the pressure adjustment tank 19 communicate with each other through the communication channel 18, and the water in the chlorine removal tank 16 is in the pressure adjustment tank 19 according to the upper and lower surfaces of the water W. The surface of the water W moves up and down.

In the above, the seawater S in the breeding aquarium 1 is supplied to the electrolytic cell 5 through the switching valve 12a, but the seawater S is branched into the flow paths 26a and 26b by the switching valve 12a to be the anode chamber 3 and the cathode chamber 4. And is electrolyzed at this time. By performing electrolysis in this way, the seawater S passing through the anode chamber 3 is adjusted to be acidic, and the seawater S passing through the cathode chamber 4 is adjusted to be alkaline. Active chlorine such as hypochlorous acid (HClO) and chlorine (Cl ₂ ) is generated from the sodium chloride in the inside. Here, depending on the setting of the diameter of the water channel in the switching valve 12a, the amount of the seawater S flowing from the switching valve 12a to the anode chamber 3 through the channel 26a passes from the switching valve 12a to the channel 26b. The amount of water passing through the seawater S flowing into the cathode chamber 4 is 1/20 or less. By reducing the amount of water passing through the anode chamber 3 in this way, the pH of the acidic water produced in the anode chamber 3 can be made 4 or less. The lower limit of the water flow rate of the seawater S flowing in the anode chamber 4 relative to the water flow rate of the seawater S flowing in the cathode chamber 4 is not particularly set, but about 1/100 is a practical limit of the apparatus.

Here, as the diaphragm 2 for partitioning the anode chamber 3 and the cathode chamber 4 of the electrolytic cell 5, it is preferable to use a cation exchange membrane. Active chlorine such as hypochlorous acid (HClO) and chlorine (Cl ₂ ) produced in the anode chamber 3 by electrolyzing the seawater S has a fish poisoning effect, but the seawater S passing through the cathode chamber 4 will be described later. Therefore, if this active chlorine is mixed into the seawater S passing through the cathode chamber 4, there is a risk of adversely affecting the fish and shellfish in the breeding aquarium 1. Since the cation exchange membrane does not allow such active chlorine to pass through, it prevents the active chlorine produced in the anode chamber 3 from mixing into the seawater S in the cathode chamber 4 and adversely affects the seafood in the breeding aquarium 1. Can be prevented in advance.

  The acidic seawater S in the anode chamber 3 electrolyzed in the electrolytic cell 5 as described above passes through the switching valve 13a from the flow channel 27a, and is further supplied from the flow channel 31a to the neutralization tank 7. The alkaline seawater S in the cathode chamber 4 passes through the switching valve 13a from the flow path 27b and is further supplied to the mixing tank 9 from the flow path 31b.

When the acidic seawater S is supplied from the anode chamber 3 to the neutralization tank 7, hypochlorous acid (HClO) and chlorine (Cl ₂ ) in the seawater S by the carbonizing agent 6 such as activated carbon in the neutralization tank 7. Active chlorine such as) is reduced and neutralized, and these active chlorines having fish poisoning action are converted to hydrochloric acid (HCl) having no fish toxicity. At this time, the reduction neutralization reaction in which the seawater S is brought into contact with the carbonizing agent 6 to convert the active chlorine into hydrochloric acid is effectively performed when the pH of the seawater S is 4 or less. For this reason, the flow rate of the anode chamber 3 is reduced as described above so that the pH of the seawater S becomes 4 or less. In addition, bromine acid (HBrO ₃ ) is produced from bromine contained in trace amounts in seawater S by electrolysis of anode chamber 3, and this bromate also has a fish poisoning effect. The bromic acid can be neutralized and converted to hydrogen bromide (HBr) having no fish toxicity. When the pH of the seawater S exceeds 4, the organic chlorinated product or brominated product is easily formed. Furthermore, when the pH is low and the acidity is high, the growth of microorganisms in the neutralization tank 7 can be suppressed, and the neutralization tank 7 is not clogged with biofilms due to the growth of microorganisms. It is.

  Here, as described above, the agitation pump 10 is connected to the neutralization tank 7, and the seawater S in the neutralization tank 7 is circulated by pumping and returning the seawater S in the neutralization tank 7. I have to do it. By stirring the seawater S in the neutralization tank 7 in this way, the carbonizing agent 6 can be stirred in the seawater S. It is possible to efficiently carry out the sum reaction, reduce the amount of carbonization agent 6 used, and shorten the residence time of the seawater S in the neutralization tank 7, thereby reducing the size of the neutralization tank 7. It will be.

Further, as described above, the air in the space portion 15 of the neutralization tank 7 is sucked by the air pump 29 and discharged from the diffuser pipe 8 into the water W in the chlorine removal tank 16. A part of chlorine (Cl ₂ ) dissolved in the seawater S supplied to the neutralization tank 7 is vaporized and exists in the air in the space 15, but the air in the space 15 is removed from the chlorine removal tank 16. When discharged into the water W, the vaporized chlorine gas is discharged into the water W together with the air in the space 15 and is aerated. A part of the chlorine gas is discharged into the water W in the chlorine removal tank 16. Can be dissolved. At this time, as the air in the space portion 15 of the neutralization tank 7 is discharged into the chlorine removal tank 16, the air in the space section 14 of the chlorine removal tank 16 passes through the communication air passage 37 and the space in the neutralization tank 7. It moves to the part 15, and it is trying for the atmospheric pressure in the space part 14 of the chlorine removal tank 16 not to become high.

And when the chlorine gas of the space part 15 of the neutralization tank 7 melt | dissolves in the water W in the chlorine removal tank 16 in this way, since the partial pressure of the chlorine gas of the space part 15 of the neutralization tank 7 will become low, neutralization tank Chlorine in the seawater W in 7 is vaporized and released into the space 15. Therefore, a part of chlorine (Cl ₂ ) dissolved and contained in the seawater S in the neutralization tank 7 can be discharged from the seawater S as a gas and removed from the seawater S. By removing a part of the chlorine in the seawater S in the neutralization tank 7 in this way, the seawater S is brought into contact with the carbonizing agent 6 to convert the chlorine (Cl ₂ ) in the seawater S into hydrochloric acid (HCl). The amount of hydrochloric acid produced during the process is reduced. Therefore, the pH of the seawater S in the neutralization tank 7 increases with a decrease in the amount of hydrochloric acid produced. At this time, the flow path 31a is connected to the upper part of the neutralization tank 7 as described above, so that the seawater S flows down into the neutralization tank 7, so that the aeration effect at the time of inflow Part of the chlorine can be expelled and released into the space 15, and the removal efficiency of chlorine from the seawater S can be increased. When the seawater S flows from the flow path 31 a into the neutralization tank 7, even if the seawater S flows down along the inner wall of the neutralization tank 7, the space above the water surface of the neutralization tank 7. Either may be sufficient as the part 15 is dropped and the seawater S is dripped.

  Here, the space part 15 of the neutralization tank 7 and the space part 14 of the chlorine removal tank 16 are sealed spaces, and the chlorine gas released from the seawater S is confined in the neutralization tank 7 and the chlorine removal tank 16. It is what has been. Therefore, it is possible to prevent environmental air from being contaminated with chlorine gas as in the case of releasing chlorine gas to the external space. Further, the space portion 15 of the neutralization tank 7 and the space portion 14 of the chlorine removal tank 16 communicate with each other through the communication air passage 37, and the pressure in the space portion 15 of the neutralization tank 7 and the space portion 14 of the chlorine removal tank 16 is high. If the atmospheric pressure of the space portion 15 of the neutralization tank 7 or the space portion 14 of the chlorine removal tank 16 becomes higher than the atmospheric pressure due to a rapid inflow of the seawater S into the neutralization tank 7, the chlorine The water W in the removal tank 16 moves through the communication channel 18 into the pressure adjustment tank 19 opened to the atmosphere at the opening 30, the water level of the water W in the chlorine removal tank 16 is lowered, and the volume of the space 14 is increased. The pressure can be adjusted to increase the pressure of the space 15 of the neutralization tank 7 and the space 14 of the chlorine removal tank 16. Therefore, it is possible to prevent the neutralization tank 7 and the chlorine removal tank 16 from being damaged by a rapid pressure increase.

  The acidic seawater S electrolyzed in the anode chamber 3 of the electrolytic cell 5 is supplied to the mixing tank 9 through the flow path 32 after being treated in the neutralization tank 7 as described above. Since the alkaline seawater S electrolyzed in the cathode chamber 4 as described above is supplied to the mixing tank 9, the acidic seawater S is mixed with the alkaline seawater S in the mixing tank 9. At this time, the acidic seawater S electrolyzed in the anode chamber 3 has a part of chlorine removed in the neutralization tank 7 as described above, and the pH is increased. Therefore, the pH of the seawater S mixed in the mixing tank 9 is higher than the pH of the seawater S before electrolysis sent from the breeding aquarium 1 to the electrolytic tank 5, and the pH of the seawater S is increased from the mixing tank 9 to the breeding aquarium. 1 is returned.

  In this way, the seawater S in the breeding aquarium 1 is circulated through the pH adjustment circulation path 21 so that the seawater S in the breeding aquarium 1 is returned to the breeding tank 1 from the mixing tank 9 in a state where the pH is increased. The pH can be adjusted to prevent the pH from decreasing. The pH increase of the seawater S in the neutralization tank 7 can be adjusted by the amount of aeration and the time of the aeration tube 8, and by adjusting the amount of aeration and the time of the aeration, the seawater S in the breeding tank 1 can be adjusted. It is possible to accurately adjust the pH. And since pH adjustment can be performed by electrolysis in this way and it is not necessary to add an alkaline agent, sodium and calcium contained in the alkaline agent are accumulated in the seawater S, increasing the salinity and the seawater S. The balance of ionic components is not lost, and there is no need to replace the seawater S.

  Here, when the seawater S is electrolyzed in the electrolytic cell 5 as described above, magnesium hydroxide or the like is deposited on the cathode, and if left as it is, the electrode is covered with the deposit, the current value is lowered, and the efficiency of electrolysis is reduced. In some cases, the inside of the electrolytic cell 5 may be blocked. Therefore, the electrodes 25a and 25b provided in the electrolytic cell 5 are connected to the DC power supply 28 via the electrode switching means 11 formed by a changeover switch with a timer or the like, and the electrode 25a is provided at every predetermined time or every predetermined water flow rate. 25b can be switched between the anode and the cathode. In the embodiment of FIG. 1, the electrode 25a is set as an anode and the electrode 25b is set as a cathode so that the anode chamber 3 and the cathode chamber 4 are formed. However, the electrode 25a is switched to the cathode and the electrode 25b is switched to the anode. The chamber 3 becomes a cathode chamber and the chamber 4 becomes an anode chamber.

  When the electrode switching means 11 switches between the anode and the cathode in this way, the switching valve 12a of the flow path switching means 12 and the switching valve 13 of the flow path switching means 13 are switched in conjunction with this, and the chamber 3 and the chamber 4 are switched. The flow rate of water is reversed from the above, and the seawater S is supplied from the chamber 4 serving as the anode chamber to the neutralization tank 7 and the seawater S is supplied from the chamber 3 serving as the cathode chamber to the mixing tank 9. Become. In this way, the pH can be adjusted by electrolytic decomposition of the seawater S in the same manner as described above. Magnesium hydroxide deposited on the surface of the electrode by switching the yin and yang of the electrode is dissolved in the seawater S. It can prevent being covered with the precipitate.

  FIG. 2 shows another embodiment of the present invention, in which a plurality of neutralization tanks 7 (two tanks in the embodiment of FIG. 2) are used. In this configuration, an electromagnetic switching valve 17a constituting the channel switching means 17 is provided in the channel 31a connected to the switching valve 13a, and the number of channels 40a, 40b corresponding to the number of the neutralization tanks 7 is provided. The flow is branched from the switching valve 17a, and the flow paths 40a and 40b are connected to the neutralization tanks 7, respectively. Each neutralization tank 7 is connected to the chlorine removal tank 16 through a communication air path 37 and the air in the space 15 of each neutralization tank 7 is chlorine-removed by the air supply path 35, the air pump 29, and the air diffuser pipe 8. It is made to send to the tank 16 and to make it discharge. Furthermore, each neutralization tank 7 and the mixing tank 9 are connected by a flow path 32. Other configurations are the same as those in FIG. In this configuration, the switching valve 17a communicates one of the plurality of channels 40a and 40b with the channel 31a and communicates with the other channels 40a and 40b and the channel 31a. The communication between the flow path 31a and the flow paths 40a and 40b is switched so as to be shut off, and the switching is automatically performed every predetermined time or every predetermined water flow amount.

  And the acidic seawater S sent out from the anode chamber 4 of the electrolytic cell 5 passes through the flow path 27a, the switching valve 13a, the flow path 31a, passes through the switching valve 17a, and this flow path 40a is connected from one flow path 40a. The neutralized tank 7 is supplied. When the switching valve 17a is switched, the acidic seawater S is supplied from the other channel 40b to the neutralization tank 7 to which the channel 40b is connected. In this way, the acidic seawater S is supplied to the plurality of neutralization tanks 7 in order every predetermined time or every predetermined amount of water flow. It is affected by removal. Here, the amount of the seawater S sent out from the anode chamber 4 of the electrolytic cell 5 and the total amount of the seawater S sent out from each neutralization vessel 7 and supplied to the mixing vessel 9 are set equal to each other. The amount of seawater S sent from the sump tank 7 to the mixing tank 9 is smaller than the amount of seawater S sent from the anode chamber 4 to each neutralization tank 7, and the residence time of the seawater S in each neutralization tank 7 Can be lengthened. Therefore, removal of fish poison components by neutralization of acidic seawater S in the neutralization tank 7 and pH adjustment by removal of chlorine can be performed with high efficiency. Moreover, when replacing the carbonizing agent 6 such as activated carbon in the neutralization tank 7, when performing the maintenance of the neutralization tank 7, the operation of only the neutralization tank 7 that performs maintenance is stopped. If the operation is continued, the entire pH adjustment system is stopped but not necessary.

  In addition, as mentioned above, in this embodiment, although the closed circulation culture system provided with the pH adjustment apparatus 100 is illustrated, the pH adjustment apparatus 100 is applied to the seawater from the breeding aquarium 1 of the closed circulation culture system. Not limited to this, pH adjustment can be performed on the desired seawater without using an alkaline agent.

It is the schematic which shows an example of embodiment of this invention. It is the schematic which shows an example of other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Breeding tank 2 Diaphragm 3 Anode chamber 4 Cathode chamber 5 Electrolysis tank 6 Carbonizer 7 Neutralization tank 8 Air diffuser tube 9 Mixing tank 10 Stirring pump 11 Electrode switching means 12 Channel switching means 13 Channel switching means 14 Space section 15 Space section 16 Chlorine removal tank 17 Flow path switching means 18 Communication channel 19 Pressure adjustment tank 100 pH adjustment device

Claims (7)

  A closed circulation aquaculture system that circulates while purifying the seawater in the breeding aquarium and breeds seafood in the breeding aquarium, and has an anode chamber and a cathode chamber partitioned by a diaphragm, and is supplied from the breeding aquarium An electrolytic cell for electrolyzing seawater, a neutralization tank for neutralizing active chlorine in seawater supplied from the anode chamber with a carbonizing agent, and a space above the water surface above the water surface in the neutralization tank A chlorine removal tank in which water is stored, a diffuser pipe for aerating the air in the space of the neutralization tank into the water of the chlorine removal tank, and seawater and neutralization tank supplied from the cathode chamber A closed-circulation aquaculture system comprising a pH adjusting device comprising a mixing tank that mixes seawater supplied from the tank and returns the mixed water to the breeding tank.   The closed circulation according to claim 1, wherein the diaphragm of the electrolytic cell is formed of a cation exchange membrane, and the amount of water passing through the anode chamber is set to 1/20 or less of the amount of water passing through the cathode chamber. Type aquaculture system.   The closed circulation type aquaculture system according to claim 1 or 2, wherein a pressure adjusting tank, which is open to the outside above the water surface, is connected to the chlorine removal tank by a communication channel through which water flows.   The closed circulation culture system according to any one of claims 1 to 3, further comprising a stirring pump that stirs the carbonizing agent in the neutralization tank.   Electrode switching means for switching the anode and cathode of a chamber partitioned by a diaphragm in the electrolytic cell, channel switching means for switching the flow path for supplying seawater from the breeding water tank to the anode chamber and the cathode chamber of the electrolytic cell, and an anode chamber 5. The closed circulation culture system according to claim 1, further comprising a flow path switching unit that switches a flow path for supplying seawater from the cathode chamber to the neutralization tank and the mixing tank.   6. A flow path switching means for switching a flow path for supplying seawater from the anode chamber to any of the plurality of neutralization tanks, comprising a plurality of neutralization tanks. The closed circulation aquaculture system described. An anode chamber and a cathode chamber partitioned by a diaphragm, and an electrolytic cell for electrolyzing seawater, a neutralization tank for neutralizing active chlorine in seawater supplied from the anode chamber with a carbonizing agent, and above the water surface The space is in communication with the space above the surface of the water in the neutralization tank, the chlorine removal tank in which water is stored, and the air that is aerated by jetting the air in the space in the neutralization tank into the water of the chlorine removal tank A pH adjusting apparatus comprising: a trachea; and a mixing tank for mixing seawater supplied from a cathode chamber and seawater supplied from a neutralization tank.

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