JP5028566B2 - Seawater purification device for surviving marine seafood and seawater purification method - Google Patents

Description

  The present invention is a fish tank for live fish transport such as seafood, stockpile tank, seed and fish production facility tank, aquaculture facility tank, aquarium tank, etc. The present invention relates to a water treatment apparatus and a water treatment method for circulating and purifying seawater for survival.

  In general, when producing and rearing seafood, etc., the nitrogen contained in the feed is excreted and retained by the living organisms in the form of ammonia and other substances. Nitrous acid is made harmless as nitric acid by the activity of another microorganism. However, if the concentration of nitric acid is high, it is dangerous for the breeding organisms. Therefore, it is necessary to dilute with fresh water, and a large aquarium requires a large amount of raw water. In addition, since a large amount of filter medium is required to support the microorganism group, a large-capacity biological filtration tank corresponding to 30 to 40% of the water tank for breeding seafood and the like is necessary. The filter medium supporting the microorganism group is deteriorated in performance due to accumulation of dead bodies and the like, and thus periodic cleaning is required. However, cleaning the filter medium in a large aquarium requires great labor and cost. Furthermore, since the microorganism group used for the treatment of ammonia is an aerobic microorganism, it requires a large amount of oxygen, so it is necessary to dissolve oxygen in the breeding water that is nearly twice the oxygen consumed by seafood. It was necessary to install a large blower. A large amount of water and the use of a blower having a large capacity led to an increase in running cost and an increase in production cost.

  Conventionally, in the juvenile fish breeding tanks for the production of seedlings such as seafood, so-called pouring method is adopted in which natural seawater is introduced into the breeding tank and discharged, and seawater is reused. There was no. In the seed and seedling production site where a large amount of seawater is used for the amount of breeding, the cost of filtering, sterilizing and heating and cooling the seawater used is a problem.

  In aquaculture tanks such as terrestrial aquaculture tanks and aquariums, the circulation filtration system is such that the water in the breeding aquarium is led to a physical filtration device and biological filtration device by a circulation pump, and is filtered before returning to the breeding aquarium. It has been. New natural seawater is replenished to compensate for the amount of water that decreases during circulation. There were also examples in which an ultraviolet irradiation device or an ozone treatment device for the purpose of sterilization, a denitrification device for removing accumulated nitric acid components, and a foam separation device for removing organic substances were installed.

  In the tank for transporting live fish and the tank for stockpiling, a filtration tank is basically not installed, but a physical filtration tank or a biological filtration tank may be installed in the circulation path of breeding water as needed.

  In the physical filtration tank, suspended substances such as scales and feces removed from the fish are removed, and in the biological filtration tank, it is dissolved in water by the action of microorganisms that live on the surface of the filter medium installed in the filtration tank. Highly toxic ammonia is oxidized through nitrous acid to less toxic nitric acid. This action of the microbial community has the effect of reducing the toxicity of ammonia and reducing the amount of fresh water used. However, since the physical filtration tank and the biological filtration tank are gradually clogged due to the accumulation of suspended substances and microbial dead bodies, a regular cleaning operation is required. Although washing with backflow water washing (back washing) is also performed, it is necessary to take out the filter medium of the biological filtration tank from the filtration tank once every few years, which is a difficult task and increases management costs. It was connected to.

As a technique for solving these problems, Japanese Patent Application Laid-Open No. 2000-157100 “Water treatment apparatus and method for production and breeding of fish and other seedlings” includes a watering filter bed and hypochlorous acid in the circulation path of breeding water. A water treatment apparatus provided with an injection apparatus has been proposed.
Japanese Patent Laid-Open No. 2001-178307, “Treatment Water Treatment System for Freshwater Fish” electrolyzes a small amount of salt contained in fresh water, and sterilization, sterilization, and water quality improvement of the breeding water are performed with the generated hypochlorous acid. A method has been proposed.
Although not intended for the rearing of seafood, etc., as a method for treating ammonia-containing wastewater, Japanese Patent Application Laid-Open No. 2006-297206 “Ammonia Nitrogen-Containing Wastewater Electrolytic Treatment Method and Apparatus” discloses that ammonia-containing wastewater is salified There has been proposed a method of electrolyzing wastewater with a pH of 5 or more and 8 or less in the presence of product ions, and converting ammonia into nitrogen by a reaction between the generated hypochlorous acid and ammonia.
Moreover, in Japanese Patent Laid-Open No. 2002-335811 “Seawater Circulation Device for Aquaculture”, an electrolyzer for decomposing ammonia in the circulation path of breeding water is used as a seawater purification device for culturing seafood on land. Proposed seawater circulation devices have been proposed.
Further, in Japanese Patent Application Laid-Open No. 2007-29784, ozone is added to ammonia-containing wastewater and mixed, and the mixture is passed through a filling filled with ozone adsorbent to adsorb ammonia and ozone. A method for oxidizing and decomposing ammonia by oxidizing power has been proposed.

JP 2000-157100 A JP 2001-178307 A JP 2006-297206 A JP 2002-335811 A JP 2007-29784 A

The conventional circulation filtration system using microorganisms has the following problems in order to oxidize highly toxic ammonia to relatively less toxic nitric acid.
(1) Since aquarium water is oxidized, it needs to be neutralized.
(2) It needs to be diluted before nitrate nitrogen accumulates and poisons fish, and it cannot be used at all for juvenile fish that are particularly sensitive to nitrate nitrogen.
(3) In seedling production, especially rearing of juvenile fish, the increase in pollution load due to growth and feeding is severe, and it is difficult to follow with conventional methods.
(4) In the circulation filtration method, in order to prevent the function from being deteriorated due to accumulation of loads such as pollution, periodic back washing of the filtration tank or washing with the filter medium is required.
(5) Since a large-capacity filtration tank is required and the microorganism group that decomposes ammonia requires a large amount of oxygen, a large amount of energy is required for heating, cooling, and oxygen supply. Cost increases.
(6) It is necessary to increase the number of microorganisms in order to secure the amount of microorganisms necessary for the ability to cope with the pollution load on the surface of the filter medium, and it takes a period of several weeks to actually use it. If the aquarium and the entire purification device line were disinfected with hypochlorous acid, etc. when a disease occurred in the aquarium, this method was used except for replacing the disinfected filter medium with the filter medium on which microorganisms were propagated in advance. The use of aquariums and clarifiers will require weeks to reach the required level of microbial capacity.

  In the method using a trickling filter and hypochlorous acid presented in Japanese Patent Laid-Open No. 2000-157100, in order to solve the above-mentioned problems, the trickling filter and hypochlorous acid are placed in the circulation path of the breeding water. Proposal of a method with an injection device, but the growth of microorganisms for decomposing organic matter and algae for absorbing nitrogen components such as ammonia in the sprinkling filter bed, and It is intended to be removed and sterilized using hypochlorous acid. In this method, there is no accumulation of nitrogen components in the fish tank water in order to allow the algae to absorb the nitrogen components. Therefore, although improvements on (1) and (2) described above are expected, (3), (4 (5) is not improved because it is necessary to install a large-capacity water filter bed in order to improve (). In addition, (6) cannot be solved because it relies on biological functions such as the use of microorganisms for the decomposition of organic matter and the need to apply light for the growth of algae.

  In the method of electrolyzing a small amount of salt contained in fresh water and sterilizing, sterilizing, and improving the water quality in breeding water using the generated hypochlorous acid, which is proposed in JP-A-2001-178307, hypochlorous acid Is not assumed to be used for deammonification, and since the conventional biological filtration tank is provided, all the problems (1) to (6) cannot be solved. The amount of hypochlorous acid generated is 0.02 to 0.04 mg / liter, which is not harmful to the freshwater fish to be bred, so it is not removed at a practical level. .

  As disclosed in Japanese Patent Application Laid-Open No. 2006-297206, ammonia-containing wastewater is electrolyzed in the presence of chloride ions with a pH of the wastewater of 5 or more and 8 or less, and ammonia is generated by a reaction between the generated hypochlorous acid and ammonia. In the method of converting nitrogen to nitrogen, the reaction rate of ammonia and hypochlorous acid in wastewater depends on the concentration of each component in the wastewater, so low concentrations of ammonia that would cause problems in the breeding of seafood, etc. When processing the contained water, it is necessary to prepare a large capacity reaction tank.

As a seawater purification device for cultivating seafood on land, proposed in JP-A-2002-335811, a seawater circulation device provided with an electrolytic cell for decomposing ammonia in the circulation path of breeding water In the same manner as the method proposed in Japanese Patent Application Laid-Open No. 2006-297206, the reaction rate between ammonia and hypochlorous acid in the breeding water depends on the concentration of each component in the breeding water, When processing low-concentration ammonia-containing water, which causes problems in breeding, it is necessary to prepare a large-capacity reaction tank.
In addition, when hypochlorous acid is used for the purification of fish and shellfish breeding water, there is a high possibility that harmful volatile organochlorine compounds are generated by the reaction between organic substances discharged from fish and shellfish and hypochlorous acid. In the method presented in Japanese Patent Application Laid-Open No. 2002-335811, no consideration is given to organochlorine compounds, and hypochlorous acid generated by electrolysis of breeding water is ammonia or organic matter discharged from seafood. The organochlorine compounds produced in a competitive manner will flow into the fish tank.

  Ozone is added to ammonia-containing wastewater proposed in Japanese Patent Application Laid-Open No. 2007-29784 and mixed, and the mixture is passed through a packed tower packed with an ozone adsorbent to adsorb ammonia and ozone. In the method of oxidizing and decomposing ammonia by the oxidizing power of ozone, the reaction field can be reduced in volume by using an ozone adsorbent, but it is difficult to adjust the ozone concentration. Not suitable as a purification device. Ammonia and organic matter discharged from fish and shellfish vary depending on the physical condition of the fish and shellfish that are living organisms, feeding conditions, etc., and a constant amount is not always discharged. Therefore, it is necessary to perform treatment according to the amount of ammonia and the amount of organic matter. However, it is difficult to adjust the output of an ozonizer that generates ozone, and it is difficult to arbitrarily change its treatment capacity. If the amount of ozone supplied is small relative to the load, the purification capacity will be insufficient and pollution will progress, and if ozone is supplied excessively relative to the load, ozone will be highly toxic to seafood or the oxidation of seawater components by ozone The oxidant produced by the fish will flow into the fish and fish rearing tank, resulting in the death of the fish and shellfish raised.

In order to solve the above-described problems, the present invention produces or breeds fish and shellfish in a fish tank for transporting live fish such as seafood, a storage tank, a seedling production facility tank, an onshore aquaculture facility tank, an aquarium tank, etc. In a seawater purification system for surviving seafood, etc., for purposes such as for the purpose of efficiently supplying hypochlorous acid and ammonia into the seawater purification route for breeding seawater that circulates through the aquarium containing seafood, etc. Fish tanks, etc. characterized by efficiently removing ammonia by adsorbing ammonia and hypochlorous acid discharged from fish and shellfish etc. to the adsorbent surface, which is equipped with a reaction tank containing adsorbents to be adsorbed A seawater purification apparatus for surviving water and a seawater purification method using the apparatus are provided.
More specifically, the seawater purification apparatus according to the present invention produces marine fishery products in seedlings in a fish tank for transporting live fish, stockpile tanks, a seedling production facility tank, an aquaculture facility tank, an aquarium tank, etc. In a seawater purification device for surviving marine seafood for purposes such as rearing, the seawater for breeding that circulates through the aquarium containing marine seafood is split in two directions In one of the purification paths for circulating the breeding seawater, a reaction tank containing an adsorbent that efficiently adsorbs hypochlorous acid and ammonia and / or organic matter is disposed, and ammonia discharged from marine seafood and Alternatively, organic substances and hypochlorous acid are adsorbed on the surface of the adsorbent, and hypochlorous acid is supplied by electrolyzing the breeding seawater in the purification path of the breeding seawater upstream of the reaction tank. Aimed at Removal to remove excess oxidant components and by-products generated in the decomposition reaction of hypochlorous acid and organic substances in the purification path that arranges the gasification tank and circulates the remaining one of the breeding seawater It is characterized by the arrangement of a removal tank containing materials.
In addition, the seawater purification method according to the present invention produces or breeds marine seafood in a fish tank for transporting live fish, stockpile tanks, seedling production facility tanks, onshore aquaculture facility tanks, aquarium tanks, etc. In the seawater purification method for surviving marine seafood for use, etc., the seawater for breeding that circulates through the aquarium containing marine seafood is bifurcated in two directions. A step of electrolyzing the breeding seawater using an electrolysis tank to supply hypochlorous acid, and a hypochlorous acid using a reaction tank for the breeding seawater via the electrolysis tank And a step of efficiently adsorbing ammonia and / or organic matter, and in the decomposition reaction of excess oxidant components and hypochlorous acid and organic matter using the removal tank with respect to the remaining one of the breeding seawater Generated by-products And a step that supports
It is characterized by that.

As an adsorbent for adsorbing ammonia, organic matter, and hypochlorous acid in the present invention, ammonia and organic matter that are pollutants are not decomposed by hypochlorous acid, and hypochlorous acid generated by electrolysis of breeding seawater is used. It must be able to be adsorbed efficiently, and is set in the reaction tank as a lump having a certain structure typified by a granular or honeycomb structure. Preferably, it is most desirable to store in the reaction tower as a structure such as a honeycomb structure having a low water flow resistance. Specifically, one or more kinds of pentasil zeolite, zeolite β, ultrastable Y-type zeolite (USY), mesoporous silicate, ultrastable mordenite (USM), and the like can be used.
In order to suppress the production of organochlorine compounds produced by the reaction between hypochlorous acid and organic matter discharged from fish and shellfish, organic substances can be produced by using an adsorbent that has a particularly high adsorption capacity for ammonia and a low adsorption capacity for organic substances. The production of chlorine compounds can also be suppressed.

  The electrolyzer according to the present invention is composed of one or more pairs of electrodes and one or more electrolyzers that store the electrodes. When implemented in a plurality of electrolysis tanks, the electrolysis tanks can be partitioned between porous plates such as ion exchange membranes or ceramics. As the electrode, any electrode that can generate hypochlorous acid by seawater electrolysis can be used. Typically, a metal electrode typified by a platinum plate modified with platinum, a carbon electrode, or the like can be used. In direct-current electrolysis of seawater, deposits such as magnesium hydroxide may be generated on the cathode-side electrode surface, so that the polarity of the electrode can be reversed at regular intervals to prevent the precipitation, Various methods and electrolysis tank structures that have been devised for preventing the precipitation of magnesium hydroxide and the like can also be employed.

  As an adsorbent for removing by-products such as organochlorine compounds produced in the decomposition reaction of excess oxidant components and hypochlorous acid and organic substances in the present invention, porous adsorbents such as activated carbon, adsorbents, etc. In addition to the porous adsorbent having a function of decomposing the zeolite, various zeolites can be used.

  In the present invention, various types of circulation pumps can be used in order to circulate the production and breeding water in the purification path for production and breeding water that circulates through the production and breeding aquarium containing fish and shellfish. When there is a limit to the amount of power that can be used like a fish tank for live fish transportation, a flow can be created in the purification path using aeration.

  In the present invention, in the water treatment apparatus for production and breeding of seafood, etc., the breeding seawater is extracted from the aquarium such as a fish tank for transporting live fish, a tank for stockpiling, a seedling production facility tank, an aquaculture facility tank, an aquarium tank, etc. Through the tank, the pollutants contained in the water are led to a reaction tank containing an adsorbent that efficiently adsorbs hypochlorous acid and ammonia and / or organic matter, and the electrolysis of the breeding seawater in the electrolysis tank The produced hypochlorous acid and the pollutant were adsorbed on the surface of the adsorbent, and the oxidative decomposition reaction of the pollutant was performed at a higher concentration than the reaction that occurs in an aqueous solution without the adsorbent. Ammonia reacts with hypochlorous acid under appropriate conditions to convert it directly to nitrogen via chloramine, leaving no nitrogen component in the breeding seawater. Since this reaction is carried out at a high concentration on the surface of the adsorbent, the apparent reaction rate is faster than the reaction that occurs in water, so that the reaction tank capacity can be significantly reduced. In addition, by setting an optimal current value according to the amount of pollutant load, the decomposing ability can be changed instantaneously, and there is also wasted time corresponding to the start-up of a biological filtration tank as in the case of using a microorganism group. No longer needed.

  As a result, since nitrous acid and nitric acid are not substantially produced in seed and seed production facility tanks, onshore aquaculture facility tanks, aquarium tanks, etc., it was possible to significantly reduce regular water exchange to lower the nitrogen component concentration. . In addition, it has become possible to reuse the rearing water for rearing fry at the seed and seedling production sites where it has been impossible to reuse the rearing water. Furthermore, while the conventional biological filtration tanks using microorganism groups required 30% to 40% of the capacity of the breeding tanks, the reaction tanks with a capacity of several% can be used. The amount of seawater required for fish breeding is remarkably reduced, the energy for heating and cooling the breeding seawater is reduced, and the operation for pre-starting the filtration tank is no longer necessary. There are merits such as being able to obtain the necessary ability, and all the problems (1) to (6) described above can be solved.

  In the present invention, the seawater immediately after being discharged from the reaction tank in order to set the optimum current value for removing ammonia and / or organic substances, which are the pollutants discharged from seafood etc., most efficiently and safely The concentration of hypochlorous acid in the water and the ammonia concentration in the seawater just before entering the electrolysis tank were calculated and calculated from the capacity of the electrolysis tank. The electric power of the electrolysis tank was controlled so that the hypochlorous acid concentration immediately after being discharged from the reaction tank was set to a current value of 1 mg / L or less. If the current value is made higher than the above set conditions, excess hypochlorous acid will flow into the removal tank, causing a reduction in the life of the removal tank and a decrease in the breeding tank pH. In addition, when electrolysis is performed under the above set conditions, the ammonia removal efficiency is remarkably lowered.

  Hereinafter, the present invention will be described in detail with reference to embodiments of the accompanying drawings.

FIG. 1 illustrates a water treatment apparatus according to a preferred embodiment of the present invention. Water contaminated by fish or the like in a breeding aquarium 1 used for production or breeding of seafood or the like is a fish breeding tank. Overflow from 1 or withdrawn from the bottom, suspended matter such as fish scales and feces is filtered in the physical filtration tank 2. The breeding water W drawn from the physical filtration tank 2 by the circulation pump 3 is branched in two directions. On the other hand, the breeding water W1 passes through the electrolyzer 4 and then undergoes decomposition of organic substances in the pollutant in the breeding water and conversion reaction from ammonia to nitrogen in the reaction tank 5 containing zeolite. The breeding water purified in the reaction tank 5 is returned to the physical filtration tank 2. The remaining one rearing water W2 passes through the activated carbon tank 8 and returns to the rearing tank 1. The total capacity of the reaction tank 5 and the activated carbon tank 8 is about 2% to 8% of the seafood breeding tank 1, and the capacity can be significantly reduced.
When rearing fish and shellfish over a long period of time, it may be necessary to replenish the reduced amount of seawater because the water may decrease due to evaporation of water or washing of the filter in the physical filtration tank. There is. When replenishing seawater, the most important thing to keep in mind is that no germs or viruses can enter. In the water treatment apparatus according to the present invention, a line for supplying makeup water with a switching valve 10 is provided after branching into breeding water W1 and breeding water W2 in the purification path and before entering the electrolysis tank 4. It can also be installed. By installing a makeup water line at this location, it becomes possible to sterilize the makeup water while purifying the breeding water.
The current value in the electrolysis tank 4 is set by measuring the hypochlorous acid concentration in seawater immediately after being discharged from the reaction tank 5 with the hypochlorous acid determination device 6 and immediately before entering the electrolysis tank 4. Using the value obtained by measuring the ammonia concentration in the sea water with the ammonia quantification device 9, it is calculated from the capacity of the electrolysis tank 4, and the sub-a concentration of 6 times the ammonia concentration just before entering the electrolysis tank 4 by weight concentration. The power supply 4 of the electrolysis tank is set to a control device 7 so as to set the current value so that the concentration of hypochlorous acid immediately after being discharged from the reaction tank is 1 mg / L or less. However, in consideration of the cost of the entire system, the measurement of the hypochlorous acid concentration and the ammonia concentration is performed manually, the current value of the electrolysis tank is calculated, and the current value is manually determined. May be set. Note that the ammonia concentration in the seawater immediately before entering the electrolysis tank 4 is substantially the same as that in the physical filtration tank 2, so that the ammonia concentration in the seawater in the physical filtration tank 2 can be substituted.
Furthermore, in order to reduce the burden on electrolysis, the system of the present invention can be used with a device for removing organic substances such as a foam separator.
FIG. 2 is a schematic vertical cross-sectional view of a compact system in which a reaction tank and a removal tank are connected in series. The solid line in the figure indicates the circulation route (water channel) of the breeding water, and the dotted line indicates the electrical wiring (electric wire) for controlling the electrolysis tank.

The effect of the present invention was verified with the water treatment system shown in FIG. The capacity and capacity of each device are shown below.
・ The capacity of the seafood breeding tank is 500L.
・ Seawater flow rate is 1 L / min on the electrolyzer side and 8 L / min on the activated carbon tank side.
・ Electrolysis tank electrode Platinum modified titanium electrode
The polarity was reversed every 5 minutes, and the current value was appropriately adjusted at 0.5 to 2.5 A.
・ Reaction tank Super stable Y-type zeolite with honeycomb structure
φ10cm × 10cm (H) × 2 pieces (1.6 liters)
・ Oxidant removal tank φ10cm × 30cm (2.4 liters)
・ The capacity of the physical filtration tank 2 is 59 liters, and a filter mat is installed, although not shown in the figure. ・ Fresh fish Mahata 12 kg (500 g × 24 fish)

In the experiment, 12 kg of mahata was placed in a seafood breeding tank 1 filled with artificial seawater, and was fed for 2 months by daily feeding. An air stone connected to an aeration pump (not shown) was placed in the breeding water tank 1, and air aeration was performed. In the physical filtration tank 2, a commercially available filter mat was installed and washed every week. Feces discharged from Mahata were taken out of the rearing tank 1 using a small-diameter hose every day, and the amount of seawater discharged at that time was replenished. The amount of makeup water is about 5 liters per day, which is equivalent to about 1% with respect to 500 liters of breeding water.
About the water quality in the fishery breeding tank 1, water temperature, dissolved oxygen amount (DO), hydrogen ion concentration (pH), ammonia concentration, nitrous acid concentration, nitric acid concentration, and residual hypochlorous acid concentration were measured. Moreover, the total trihalomethane density | concentration in the seafood breeding tank 1 of the 60th day was measured as a parameter | index of an organic chlorine compound. Further, in order to see the degree of growth of the grouper, the average fish weight at the start of breeding and after 60 days was measured.
In order to verify the effect of the adsorption reaction tank, the ammonia concentration and hypochlorous acid concentration before and after the reaction tank 5 were also measured, and the amount of hypochlorous acid necessary for ammonia removal was verified. In addition, about the ammonia concentration before entering into the reaction tank 5, it replaced with the density | concentration of the physical filtration tank water. Moreover, the hypochlorous acid concentration before entering the reaction tank 5 was calculated from the capacity of the electrolysis tank measured in advance.

Results of water quality measurements on the 1st, 20th, 40th, and 60th days of the experiment, the average value of the fish weight before the start of breeding and on the 60th day, and the total trihalomethane concentration in the aquarium water on the 60th day The measurement results are shown in Table 1. As for the average fish weight, the start of breeding was entered in the first day column.

In Table 1, hypochlorous acid is a current value that produces a hypochlorous acid concentration that is at least six times the ammonia concentration of the physical filtration tank before entering the electrolysis tank, and immediately after being discharged from the reaction tank. By selecting the current value condition that the concentration is 1 mg / L or less, the water quality from the start of breeding to the 60th day is stable to the extent that ammonia concentration is several mg / L and there is no problem in the breeding of seafood. Both the concentration and the nitric acid concentration were very low even after 60 days from the start of breeding, and the hypochlorous acid concentration harmful to fish and shellfish also remained at a very low value.
This result showed that the ammonia discharged from the seafood was converted to nitrogen by the seawater purification apparatus of the present invention, and it was confirmed that there was no accumulation of nitrogen components in the breeding water.

  The measurement result of the total trihalomethane concentration on the 60th day when the water quality is most likely to deteriorate is also significantly lower than the regulated value of tap water of 0.1 mg / L or less. And it was confirmed that it is possible to create safe breeding water by using the removal material of reaction by-products.

  In this verification experiment, the survival rate of Mahata was 100%, and it was confirmed from the average fish weight in Table 1 that Mahata grew smoothly, indicating that the seawater purification apparatus of the present invention was effective. .

  When performing seawater purification using a general biological filtration tank, a biological filtration tank corresponding to 30 to 40% of the capacity of the rearing tank is required. However, the seawater purification apparatus according to the present invention has a capacity of about 1% for seafood. It was proved that breeding was possible, and the superiority of the present invention could be proved.

  In the present invention, by using hypochlorous acid generated by electrolysis of seawater and using it together with an adsorbent that efficiently adsorbs hypochlorous acid and ammonia and / or organic matter, remarkably efficient seawater purification is realized. did. Since the generation of hypochlorous acid by electrolysis can be easily controlled by the current value, it can be treated stably with respect to the load, and the most important harmful substances in handling organisms flow into the breeding tank. It was also possible not to let it happen.

  As described in detail above, according to the seawater purification device and the seawater purification method of the present invention, in a fish tank for transporting live fish such as seafood, a storage tank, a seedling production facility tank, an aquaculture facility tank, an aquarium tank, etc. In applications where surviving or breeding seawater fish, water change due to accumulation of nitric acid is unnecessary or can be significantly reduced, the overall seawater purification system can be significantly reduced in volume, reducing running costs, and the adsorbent has a honeycomb structure and small capacity Therefore, the technical effects such as the fact that the labor of replacement / cleaning can be remarkably reduced and the period for starting up microorganisms in advance are not required.

  The present invention makes use of the above-described excellent features to use the fish tank for live fish transportation for transporting the seafood alive from the production area to the consumption area, or to keep it alive until the seafood is sold. Marine fish such as storage tanks for temporary storage before transfer to others, aquarium tanks used for seedling production for onshore cultivation or release, aquaculture tanks, tanks used for display purposes in aquariums, etc. Can be used for the purpose of seawater purification of aquariums used for survival or breeding on land, providing technically and economically superior methods compared to conventional biological filtration and other methods Is.

It is a longitudinal cross-sectional schematic diagram showing the suitable example of the seawater purification apparatus of this invention. It is a longitudinal cross-sectional schematic diagram of the compact system which connected the reaction tank and the removal tank in the column.

Explanation of symbols

1: Water tank for survival or breeding of seafood 2: Physical filtration tank for removing suspended matter such as fish scales 3: Circulation pump 4: Power source for controlling the electrolysis tank and electrolysis tank 5: Reaction tank 6: Hypochlorous acid determination device 7: Control device 8: Removal tank for removing excess oxidant and reaction by-products 9: Ammonia determination device 10: Switching valve
W: Breeding water In the figure, the solid line indicates the circulation route (water channel) of the breeding water, and the dotted line means the electrical wiring (electric wire) for controlling the electrolysis tank.

Claims (3)

Surviving marine seafood for purposes such as seedling production or breeding of marine seafood in aquariums for marine seafood, fish tanks for stockpiling, seedling production facility tanks, aquaculture facility tanks, aquarium tanks, etc. Seawater purification equipment for
The breeding seawater that circulates through the aquarium containing the marine seafood is divided into two directions,
In one of the purification paths for circulating the breeding seawater, a reaction tank containing an adsorbent that efficiently adsorbs hypochlorous acid and ammonia and / or organic matter is arranged, and ammonia discharged from marine seafood and / or Adsorbing organic matter and hypochlorous acid on the adsorbent surface, and supplying hypochlorous acid by electrolyzing the breeding seawater in the purification path of the breeding seawater upstream of the reaction tank Place the desired electrolysis tank,
A removal tank containing a removal material for removing excess oxidant components and by-products generated in the decomposition reaction of hypochlorous acid and organic substances in the purification path for circulating the remaining seawater for breeding. A seawater purification device for surviving marine seafood characterized by being arranged . The seawater purification apparatus for surviving marine seafood according to claim 1 , wherein the concentration of hypochlorous acid in seawater immediately after being discharged from the reaction tank and the ammonia in seawater immediately before entering the electrolysis tank The concentration is measured, calculated from the capacity of the electrolysis tank, and a current value that produces hypochlorous acid having a weight concentration of 6 times or more the ammonia concentration, and the hypochlorous acid immediately after being discharged from the reaction tank A seawater purification apparatus for surviving marine seafood, characterized by controlling the power source of the electrolysis tank so as to set the chloric acid concentration to a current value of 1 mg / liter (L) or less. Surviving marine seafood for the purpose of seedling production or breeding of marine seafood in fish tanks for live fish transportation, stockpile tanks, seedling production facility tanks, aquaculture facility tanks, aquarium tanks, etc. In the seawater purification method for
Dividing the seawater for breeding that circulates through the aquarium containing marine seafood into two directions,
On the one of the breeding seawater, the step of electrolyzing the breeding seawater using an electrolysis tank to supply hypochlorous acid, and the breeding seawater via the electrolysis tank, Using a reaction vessel to efficiently adsorb hypochlorous acid and ammonia and / or organic matter ,
For the remaining one the breeding seawater, and excess oxidant components using a removing tank, <br/> that a step of removing by-products produced in the decomposition reaction of hypochlorous acid with organic matter Seawater purification method for surviving marine seafood characterized by

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