JP2021126089A - Water purification device - Google Patents

Abstract

To provide a water purification device for an aquatic life storage device capable of purifying water in an aquatic life storage container at an optimum timing and by an optimum method with reduced costs.SOLUTION: A water purification device includes: a conveyance mechanism 2 for conveying discharged water discharged from a storage container 101 for storing an aquatic life; a biological purification tank 3 for biologically purifying the discharged water conveyed by the conveyance mechanism 2; an electrolysis tank 4 for purifying by electrolysis at least part of the discharged water conveyed by the conveyance mechanism and the water discharged from the biological purification tank 3; a concentration measuring part 20 for measuring dissolved oxygen concentration in the discharged water; a conveyance control part 5 for controlling at least one of a conveyance destination and a flow rate of the discharged water to the biological purification tank 3 and the electrolysis tank 4 respectively on the basis of a result of measured concentration; and a recirculation mechanism 6 for recirculating biologically purified water obtained by the purification in the biological purification tank 3 and electrolytically purified water obtained by the purification in the electrolysis tank 4 to the storage container 101.SELECTED DRAWING: Figure 2

Description

The present invention relates to a water purification device for an aquatic organism accommodating device capable of storing or transporting aquatic organisms and suitable for the aquatic organism accommodating device.

There is an increasing demand for storage and transportation of various types of aquatic organisms in a certain period of time. For example, it is required to store edible aquatic organisms (edible fish, seafood, etc.) at the fishing site for a certain period of time (several days to several weeks, depending on the type and need). Sometimes. This is because there is a waiting time from catch to sale and transportation, and it is necessary to utilize the caught aquatic organisms in this waiting time. It is required to maintain the health condition and freshness of aquatic organisms even in the storage for keeping them alive.

Here, the storage may be the above-mentioned storage for a certain period of time after fishing, or may be storage for a certain period of time outside the fishing area. Alternatively, it also includes the case of storage until growth or shipment in aquaculture or farming. That is, aquatic organisms caught for shipping may be stored (or transported), or may be stored for a certain period of time for aquaculture or aquaculture. In any of these senses, storage here corresponds.

For example, in a restaurant that serves fish dishes, edible fish and shellfish may be stored alive for a considerably long period of time. Even in such storage, it is required to store aquatic organisms such as fish and shellfish in a fresh and healthy state.

Alternatively, it is becoming necessary to transport aquatic organisms alive from fishing areas and accumulation areas. For example, it is required to transport aquatic organisms caught in local fishing ports to urban areas where they are consumed while they are still alive. In transportation, it is important to maintain the freshness and health of aquatic organisms in addition to transporting them alive.

This is because various stresses are applied to aquatic organisms during transportation due to the characteristics of transportation. In response to this stress, it is required to properly maintain freshness and health.

Furthermore, it is required to store the transported aquatic organisms for a certain period of time until they are put to practical use in the place of consumption. When aquatic organisms are used for food, storage may be required for the time until they are actually used for food. For example, in the case of fish and shellfish that need to be cooked alive and served for meals. Alternatively, it is required to store the ornamental aquatic organisms while maintaining their health condition before selling them.

In such storage or transportation, there are the following circumstances.

The reason for keeping it alive in the fishing area is that it needs to be carried out at the timing and interval of transportation to the place where it is actually consumed. This depends on the circumstances in the place of consumption (necessity of meeting the conditions for purchase, the optimum timing for consumption) and the timing when transportation becomes possible. Under these circumstances, it is necessary to maintain and store the freshness and health of aquatic organisms in the fishing area.

Alternatively, if it is edible, it needs to be transported alive because it needs to be served as a meal (in some cases, ikizukuri) in a fresh state, so it is necessary to transport aquatic organisms alive. Because there is. In particular, it is required to maintain freshness and health for transportation. At this time, the fishing area and the consuming area are often far from each other. Edible (and eaten live or fresh) aquatic organisms are landed in rural coastal areas.

On the other hand, the consumption areas are the urban areas around the fishing areas or the three major metropolitan areas such as Kanto, Kinki, and Chukyo. Such urban areas and the three major metropolitan areas are often remote from fishing areas. For example, squid, which is often eaten in a fresh state such as ikizukuri, is typically caught in Kyushu, the Chugoku region, and Hokkaido. Not only squids, but also other fish and shellfish, the catching area and the consuming area are often remote. Of course, it may be landed in the vicinity of the consumption area, but there are problems such as insufficient quantity and quality, and many of the consumption areas have a high desire to eat higher quality seafood.

Under these circumstances, it is necessary to maintain freshness and health for transportation from the fishing area to the consumption area. This also applies to ornamental aquatic organisms.

In addition, even in the place of consumption where it is transported, it is necessary to keep it alive until it is actually used for food. This is because it is necessary to maintain the freshness and health of the transported live aquatic organisms until they are actually cooked and served.

In this way, it is required to maintain the freshness and health of the caught aquatic organisms for storage and transportation. In particular, it may be necessary to store and transport the fish until it is stored in a facility such as a dedicated cage or a water tank.

Here, transportation needs to be carried by transportation equipment such as trucks and trains. In this transport, various situations occur and it is often difficult to maintain the health of the aquatic organisms being transported. For example, in the case of fish and shellfish, maintenance of the amount of oxygen required by fish and shellfish, treatment of excrement and waste products from fish and shellfish, maintenance of water quality, and the like are necessary conditions. It is also important to transport aquatic organisms alive without stress.

In transportation, it is necessary to realize an environment that does not easily stress aquatic organisms. For example, it is necessary to maintain the amount of oxygen (dissolved oxygen in water), remove excrement and waste products of aquatic organisms, and maintain water quality.

Similarly, it is necessary to maintain the freshness and health of aquatic organisms even when stored in a stationary place. Therefore, it is necessary to realize an environment that does not easily stress aquatic organisms. For example, it is necessary to maintain the amount of oxygen (dissolved oxygen in water), remove excrement and waste products of aquatic organisms, and maintain water quality.

Here, factors that pollute the water quality of the container for storing aquatic organisms include respiration and excretion of aquatic organisms, secretion of body fluids, spawning, and biological tissues due to damage to aquatic organisms. Among these, the problem of ammonia accumulation (due to excretion) in water is significant. If ammonia accumulates in water, the quality of the water will be polluted. Ammonia pollution is a very big problem in water pollution and has a great adverse effect on aquatic organisms.

Under such circumstances, a technique for improving water quality in the storage and transportation of fish and shellfish has been proposed (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2006-204235

Patent Document 1 is an electrolytic cell 5 which includes an anode chamber 3 and a cathode chamber 4 partitioned by a diaphragm 2 and electrolyzes seawater S supplied from the breeding aquarium 1. An aeration tank 8 to which seawater S is supplied from the anode chamber 3. A chlorine dissolution tank 10 in which a space 14 above the water surface is communicated with a space 15 above the water surface of the aeration tank 8 to store or pass water W. An aeration device 16 that aerates the air in the space 14 of the chlorine dissolution tank 10 by ejecting it into the seawater S of the aeration tank 8 and the water W of the chlorine dissolution tank 10. A neutralization tank 7 in which the active chlorine remaining in the seawater S supplied from the aeration tank 8 is neutralized with the carbonizing agent 6. A mixing tank 9 in which the seawater S supplied from the cathode chamber 4 and the seawater S supplied from the neutralization tank 7 are mixed and returned to the breeding water tank 1. A pH adjusting device 100 formed by providing these is provided. Disclosed is a closed circulation aquaculture system capable of adjusting the pH of seawater S by electrolysis of seawater S.

Patent Document 1 discloses that the pH of seawater is adjusted by using electrolysis. That is, the technique of Patent Document 1 does not disclose that water purification is realized.

Even if electrolysis is used for water purification, there is a problem that water purification is insufficient. As described above, the main cause of deterioration of water quality inside the container for storing aquatic organisms is ammonia due to excretion and the like. In electrolysis, hypochlorous acid is required to decompose this ammonia. However, this hypochlorous acid itself also has an adverse effect on aquatic organisms when returned to the storage container. This is because water purification by electrolysis takes the water in the storage container into electrolysis and circulates the decomposed water in the storage container.

It is not preferable that hypochlorous acid is returned to the storage container by this circulation because it has an adverse effect on aquatic organisms.

On the other hand, in order to remove this hypochlorous acid, it is necessary to provide a removal mechanism, but there is also a problem that this removal mechanism becomes large in terms of cost and device scale.

Further, electrolysis can decompose ammonia in the water of the storage container, but when the amount of water in the storage container increases or the amount of ammonia increases, it is necessary to increase the electrolysis capacity. In this case, there is a problem that the cost of electrolysis increases. In addition, it is necessary to install an over-engineered electrolyzer in advance in preparation for insufficient capacity, and there is a problem that it is not suitable for storage or transportation in terms of cost and size.

As described above, in the prior art, there are problems that the ability of water purification is insufficient, the cost is increased, and it is difficult to transport and store.

In view of these problems, it is an object of the present invention to provide a water purification device for an aquatic organism storage device that can purify water in an aquatic organism storage container at an optimum timing and by an optimum method to reduce costs. And.

In view of the above problems, the water purification device for the aquatic organism accommodating device includes a transportation mechanism for transporting the discharged water discharged from the accommodating container capable of accommodating aquatic organisms.
A transportation mechanism that transports discharged water discharged from a storage container that can accommodate aquatic organisms,
A biological septic tank that biologically purifies the discharged water transported by the transportation mechanism,
An electrolysis tank that purifies at least a part of the discharged water transported by the transportation mechanism and the water discharged from the biological septic tank by electrolysis,
A concentration measuring unit that measures the dissolved oxygen concentration in the discharged water,
A transport control unit that controls at least one of the transport destination and flow rate of discharged water to each of the biological septic tank and the electrolysis tank based on the concentration result measured by the concentration measurement unit.
It is equipped with a reflux mechanism for returning the biological purified water obtained by purifying in the biological septic tank and the decomposed purified water obtained by purifying in the electrolysis tank to the storage container.
Based on the concentration result, the transport control unit selects to transport substantially the entire amount of the discharged water to the biological septic tank, and to transport the discharged water to each of the biological septic tank and the electrolysis tank.

The water purification device for the aquatic organism accommodating device of the present invention can realize more effective water purification by performing necessary switching between the biological septic tank by the action of microorganisms and the electrolysis tank by electrolysis.

In addition, the timing at which the water pollution level inside the containment device becomes strong is estimated with high accuracy, and as the pollution level rises, purification is performed using both the biological septic tank and the electrolysis tank. As a result, when the pollution level is high, sufficient purification can be realized by using both the biological septic tank and the electrolysis tank.

Further, until the pollution level increases, the electric power energy required for the operation of the electrolysis tank can be suppressed by using the biological septic tank. As a result, the energy cost of the water purification device and the aquatic organism storage device as a whole can be suppressed.

Further, as described above, since low energy, low cost, and miniaturization can be realized, it is easy to attach the water purification device of the present invention to the aquatic organism storage device installed in the transportation equipment. As a result, it is possible to raise the level of transportation that maintains the health condition of aquatic organisms, such as transportation of live fish. Of course, the same applies to the stationary aquatic organism storage device.

It is a graph which shows the change of the ammonia concentration in the aquatic organism storage container in the analysis of the inventor. It is a block diagram of the water quality purification device for the aquatic organism accommodating device in Embodiment 1 of this invention. It is a graph which shows the inverse correlation between the dissolved oxygen concentration and the ammonia component concentration. It is a graph which shows the concentration result in the concentration measurement part in Embodiment 1 of this invention. It is a schematic diagram of the storage container in Embodiment 1 of this invention. It is a block diagram of the water quality purification apparatus in Embodiment 1 of this invention. It is a schematic diagram which shows the switching of the transport destination of the discharged water in Embodiment 2 of this invention. It is a schematic diagram which shows the switching of the transport destination of the discharged water in Embodiment 2 of this invention. It is a schematic diagram which shows the switching of the transport destination of the discharged water in Embodiment 2 of this invention. It is a schematic diagram which shows the switching of the transport destination of the discharged water in Embodiment 2 of this invention. It is a schematic diagram which includes the aquatic organism accommodating device in the transport device in Embodiment 2 of this invention.

The water purification device for the aquatic organism storage device according to the first aspect of the present invention includes a transport mechanism for transporting discharged water discharged from a storage container capable of containing aquatic organisms.
A transportation mechanism that transports discharged water discharged from a storage container that can accommodate aquatic organisms,
A biological septic tank that biologically purifies the discharged water transported by the transportation mechanism,
An electrolysis tank that purifies at least a part of the discharged water transported by the transportation mechanism and the water discharged from the biological septic tank by electrolysis,
A concentration measuring unit that measures the dissolved oxygen concentration in the discharged water,
A transport control unit that controls at least one of the transport destination and flow rate of discharged water to each of the biological septic tank and the electrolysis tank based on the concentration result measured by the concentration measurement unit.
It is equipped with a reflux mechanism for returning the biological purified water obtained by purifying in the biological septic tank and the decomposed purified water obtained by purifying in the electrolysis tank to the storage container.
Based on the concentration result, the transport control unit selects to transport substantially the entire amount of the discharged water to the biological septic tank, and to transport the discharged water to each of the biological septic tank and the electrolysis tank.

With this configuration, the ammonia concentration, which is difficult to measure directly, is measured from the dissolved oxygen concentration, and depending on the level of pollution, whether the purification means is only the biological septic tank or both the biological septic tank and the electrolysis tank. You can switch. This makes it possible to achieve a balance between appropriate purification and reduction of energy consumption.

In the water purification device for the aquatic organism storage device according to the second invention of the present invention, in addition to the first invention, the transport control unit generates water discharged from the storage container when the concentration result is equal to or higher than a predetermined value. Almost all of the above is transported to the biological septic tank.

With this configuration, if the pollution level is below the standard, it is purified only by the biological septic tank. As a result, energy consumption can be suppressed.

In the water purification device for the aquatic organism storage device according to the third invention of the present invention, in addition to the second invention, the transport control unit discharges water from the storage container when the concentration result is less than a predetermined value. Is transported to both the biological septic tank and the electrolysis tank.

With this configuration, when the pollution level is high, it can be purified by using both the biological septic tank and the electrolysis tank. As a result, even when the pollution is high, sufficient and reliable purification can be performed.

In the water purification device for the aquatic organism accommodating device according to the fourth invention of the present invention, in addition to the second or third invention, the transport control unit has a concentration result of less than a predetermined value. At the timing, the discharged water from the containment vessel is transported to both the biological septic tank and the electrolysis tank.

With this configuration, when the pollution level is high, it can be purified by using both the biological septic tank and the electrolysis tank. As a result, even when the pollution is high, sufficient and reliable purification can be performed.

In the water purification device for the aquatic organism accommodating device according to the fifth aspect of the present invention, in addition to the second or third invention, the transport control unit starts from the first timing when the concentration result becomes less than a predetermined value. At the second timing after the lapse of a predetermined time, the discharged water from the storage container is transported to both the biological septic tank and the electrolysis tank.

With this configuration, it is possible to reliably estimate that the pollution level centered on the ammonia concentration has risen significantly, and then purify it in the electrolysis tank. As a result, the suppression of energy consumption can be further enhanced.

In the water purification device for the aquatic organism storage device according to the sixth invention of the present invention, in addition to the fifth invention, the amount of time from the first timing to the second timing is the aquatic organisms housed in the storage container. It is determined based on at least one of the type of aquatic organism and the time from the diet of the aquatic organism to the start of digestion.

With this configuration, purification in the electrolysis tank can also be used at the optimum timing according to the increase in pollution due to biological activity and digestive activity. The optimization of energy consumption control can also be enhanced.

In the water purification device for the aquatic organism storage device according to the seventh invention of the present invention, in addition to the first invention, the concentration measuring unit is based on the charging time when the food for aquatic organisms is charged into the storage container. Calculate the digestion start time determined by the type of aquatic organism,
The transport control unit selects to transport substantially the entire amount of the discharged water to the biological septic tank and to transport the discharged water to each of the biological septic tank and the electrolysis tank based on the digestion start time.

With this configuration, purification in the electrolysis tank can also be used at the optimum timing according to the increase in pollution due to digestive activity. The optimization of energy consumption control can also be enhanced.

In the water purification device for the aquatic organism accommodating device according to the eighth invention of the present invention, in addition to the seventh invention, the transport control unit transports substantially all of the discharged water to the biological septic tank until the digestion start time. After the start time of digestion, the discharged water is transported to each of the biological septic tank and the electrolysis tank.
or,
The transport control unit transports almost all of the discharged water to the biological septic tank from the digestion start time to the third timing when a predetermined time has passed, and after the third timing, the discharged water is sent to each of the biological septic tank and the electrolysis tank. Let it be transported.

With this configuration, the electrolysis tank can be used in combination as the pollution level increases, so that the suppression of energy consumption can be further enhanced.

In the water purification device for the aquatic organism storage device according to the ninth aspect of the present invention, in addition to any of the third to eighth inventions, the transport control unit collects the discharged water from the storage container into the biological septic tank and the biological septic tank. When transporting to both the electrolysis tank, the flow rate to each of the biological septic tank and the electrolysis tank is controlled.

With this configuration, it is possible to supply discharged water according to the capacities of the biological septic tank and the electrolysis tank.

In the water purification device for the aquatic organism storage device according to the tenth invention of the present invention, in addition to any one of the first to ninth inventions, the discharged water from the storage container contains pollution derived from aquatic organisms. And
Biological septic tanks and electrolysis tanks purify or decompose pollution.

With this configuration, pollution derived from aquatic organisms can be purified in the discharged water from the container containing the aquatic organisms. As this purified water recirculates, clean water is always available in the aquatic organism containment device.

In the water purification device for the aquatic organism accommodating device according to the eleventh invention of the present invention, in addition to the tenth invention, the pollution contains an ammonia component.
The biological septic tank decomposes the ammonia component by microorganisms and
The electrolysis tank decomposes the ammonia component by generating hypochlorous acid by electrolysis.

With this configuration, each of the biological septic tank and the electrolysis tank decomposes the ammonia component by their respective mechanisms.

In the water purification device for the aquatic organism storage device according to the twelfth invention of the present invention, in addition to the eleventh invention, the concentration result is related to the increase in the concentration of the ammonia component in the water of the storage container.

With this configuration, the ammonia component concentration can be estimated from the dissolved oxygen concentration to determine the contamination level.

In addition to the eleventh or twelfth invention, the water purification device for the aquatic organism accommodating device according to the thirteenth invention of the present invention further includes an activated carbon tank for removing hypochlorous acid generated in the electrolysis tank. ..

With this configuration, hypochlorous acid used in the electrolysis tank is removed, and then electrolytically purified water is refluxed into the storage container.

In the water purification device for the aquatic organism accommodating device according to the fourteenth invention of the present invention, in addition to any one of the eleventh to thirteenth inventions, the microorganisms include a first microorganism group that decomposes an ammonia component and an ammonia component. Includes a second group of microorganisms that decompose nitrite, which is produced by the decomposition of ammonia.

With this configuration, reliable decomposition of the ammonia component by microorganisms can be realized.

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

(Inventor's analysis)

FIG. 1 is a graph showing changes in ammonia concentration inside an aquatic organism container in the inventor's analysis. Inside the aquatic organism storage container, aquatic organisms such as seafood are stored. For example, squids are housed, and fish such as horse mackerel and mackerel used for food are housed. Alternatively, ornamental aquatic organisms (tropical fish) are housed. Such aquatic organism storage containers are used in the movement from the fishing area to the consumption area, or are installed and used in restaurants serving live fish dishes.

In such aquatic organism storage containers, the activity of the contained aquatic organisms produces excrement, body fluids, eggs, and other excrement. These emissions lead to water pollution in the containment vessel. In particular, depending on the discharge, ammonia may increase inside the storage container. In particular, it was analyzed by the inventor that ammonia increases due to the biological activity of aquatic organisms eating food.

The state in which the ammonia concentration is increasing is shown in the graph of FIG. As shown in the graph of FIG. 1, the ammonia concentration increases inside the storage container.

Here, it is necessary to purify the water inside the containment container in which the ammonia concentration has increased to maintain the living environment of the aquatic organisms contained in the container. Of course, the water inside the storage container is polluted by other than ammonia, and it is necessary to purify this polluted water. By this purification, as shown in the graph of FIG. 1, the once increased ammonia concentration can be gradually decreased.

Here, the inventor examined two methods for purifying polluted water containing ammonia: (1) biodegradation using biodegradation of bacteria and the like, and (2) biodegradation by electrolysis. Although these methods are different, they exert a function of purifying pollution such as ammonia.

Biological purification and purification by electrolysis have different characteristics due to their different methods. In particular, there are differences in their abilities or the amount of energy required.

Here, since biological purification uses bacteria, which are microorganisms, its purification capacity is limited (although it is possible to increase the purification capacity by increasing the size of the biological purification equipment and the number of bacteria). In the end, there is a limit to the purification capacity of biological purification in terms of cost and equipment size limits.)

On the other hand, purification by electrolysis purifies polluted water by electrolyzing using chlorine contained in seawater. In this electrolysis, hypochlorous acid is generated, which purifies polluted water. Therefore, if the energy related to electrolysis is increased, the purification capacity can be increased. Moreover, since bacteria, which are microorganisms, are not used, the purification ability can be enhanced by a mechanical or electrical artificial device.

However, in order to increase the purification capacity by electrolysis, there is a problem that the amount of energy required must be increased. Increasing the amount of energy increases a large amount of electric power (and the mechanical burden associated therewith), increases the operating cost of the aquatic organism containment device, and has a problem of adversely affecting the environmental load. Of course, depending on the location where the aquatic organism containment device is installed, it may be difficult to sustain a large power supply, and it may be difficult to increase the purification capacity by electrolysis.

In addition, the purification of water by biological purification and the purification of water by electrolysis may differ in accuracy and effect due to the difference in the method. Each has its advantages and disadvantages. In particular, purification of water by biological purification uses bacteria, which are microorganisms, and therefore does not require direct power energy. In addition, if the survival of bacteria is maintained, permanent and repeated purification can be realized. Therefore, the inventor analyzed that it is preferable that the purification of water by biological purification is used more proactively. On the other hand, as described above, the inventor has analyzed that it is necessary for the aquatic organism containment device to also include corresponding to the limit of the purification capacity.

Based on such analysis results, the inventor accommodates only (or mainly) biological purification during the period that can be dealt with by biological purification in order to "decompose sufficient pollutant components while suppressing energy consumption". It was judged that it is appropriate to purify the discharged water from the container and purify the discharged water by using both biological purification and electrolytic purification during the period when biological purification alone cannot be used. It is also appropriate to reduce energy consumption by switching between purification using only biological purification and purification using combined use at an appropriate timing.

However, there is a problem that it is difficult to measure the change in the concentration of the ammonia component as described with reference to FIG. 1 with the discharged water from the storage container. In particular, it is difficult to measure the ammonia concentration in real time. To measure the ammonia concentration, it is necessary to set the pH to the alkaline side, develop the color of the discharged water, and measure it with an absorptiometer. Therefore, it is necessary to take a sample of the discharged water, move it to another device, and process another route for charging reagents, reacting, and measuring. As a result, there is a problem that the water purification device cannot directly handle the discharged water and measure the ammonia concentration, and it is necessary to create a treatment route with another device. That is, the device becomes large-scale and the cost increases.

In addition, since it is necessary to secure a reaction time for adding the reagent, there is a problem that the real-time property is deteriorated even if the ammonia concentration of the discharged water is measured. This is because there is a possibility that the ammonia concentration has already changed in the discharged water at the timing when the actual measurement result is obtained. Therefore, it is not suitable for the survival of aquatic organisms in the aquatic organism storage device to measure the ammonia concentration of the discharged water one after another and switch the purification method in the water quality purification device.

The inventor estimated the change in the concentration of the ammonia component from another parameter and considered switching the purification method.

The purification ability by biological purification and the purification ability by electrolysis can be grasped as the decomposition ability of pollutant components. In the following, it can be explained based on such a grasp.

Based on the above analysis and examination, the inventor has arrived at the present invention.

(Overview)
FIG. 2 is a block diagram of a water purification device for an aquatic organism accommodating device according to the first embodiment of the present invention. Hereinafter, if necessary, the "water quality purification device for aquatic organism containment devices" will be abbreviated as "water quality purification device". The water quality purification device 1 is used in the aquatic organism storage device 100. Here, in FIG. 2, the aquatic organism accommodating device 100 includes an accommodating container 101 for accommodating aquatic organisms and elements necessary for the container 101. Although this range is shown in FIG. 2, it does not need to be strictly interpreted, and the container 101 for accommodating aquatic organisms and the elements necessary for the container 101 may be grasped as the aquatic organism accommodating device 100.

Further, the water quality purification device 1 can be actually used by being combined with the aquatic organism accommodating device 100. Elements that exchange water with the storage container 101, such as the transportation mechanism 2 and the reflux mechanism 6, span the water purification device 1 and the aquatic organism storage device 100. Therefore, the element connecting the water quality purification device 1 and the aquatic organism accommodating device 100 may be grasped as a component of the water quality purification device 1 or as a component of the aquatic organism accommodating device 100. May be good. Since the water quality purification device 1 is used in the aquatic organism accommodating device 100, it is used in combination with the aquatic organism accommodating device 100 as shown in FIG.

The water quality purification device 1 includes a transportation mechanism 2, a biological septic tank 3, an electrolysis tank 4, a transportation control unit 5, a reflux mechanism 6, and a concentration measurement unit 20.

The transport mechanism 2 transports the discharged water discharged from the storage container 101. The storage container 101 stores aquatic organisms. In addition, since it houses aquatic organisms in a living state, it contains the water required for aquatic organisms. Therefore, aquatic organisms are engaged in biological activity inside the storage container 101, and as described above, pollution is generated by the biological activity. That is, the water contained in the storage container 101 contains pollution. In other words, the discharged water from the storage container 101 contains pollution.

As will be described later, the pollutant component contains an ammonia component. It is required to continuously decompose and purify the ammonia component and return the purified purified water to the storage container 101.

The transport mechanism 2 transports the discharged water from the storage container 101 to the water purification device 1. The storage container 101 is provided with a discharge unit 102, and the transportation mechanism 2 is connected to the discharge unit 102. The transport mechanism 2 connected to the discharge unit 102 transports the discharged water discharged from the discharge unit 102 to the water purification device 1. This transport may be continuous or intermittent. The transportation mechanism 2 includes a pipeline for transporting the discharged water, a pressure pump for promoting the transportation, and the like.

The biological septic tank 3 biologically purifies the discharged water. Purifies or decomposes pollution contained in discharged water by the biological activity of microorganisms such as bacteria. The type and number of microorganisms used in the biological septic tank 3 may be appropriately determined depending on the type of pollution of aquatic organisms or the concentration of pollution. The biological septic tank 3 purifies or decomposes the pollution of the discharged water based on the activity of such microorganisms, and purifies the discharged water.

Further, the transport mechanism 2 transports the discharged water from the storage container 101 to the biological septic tank 3. As will be described later, the transport mechanism 2 basically always transports the discharged water to the biological septic tank 3. That is, the biological septic tank 3 is constantly supplied with discharged water, and the biological septic tank 3 is in a state of constantly purifying the discharged water.

The electrolysis tank 4 is supplied with at least a part of the discharged water transported from the transport mechanism 2 and the water discharged from the biological septic tank 3. That is, at least a part of the discharged water discharged from the storage container 101 is supplied to the electrolysis tank 4. Alternatively, the electrolysis tank 4 is supplied with at least a part of the water from the biological septic tank 3. That is, water is supplied from two routes.

In this way, the electrolysis tank 4 is supplied with at least a part of the water of either route. Since at least a part of the discharged water is supplied to the electrolysis tank 4 by the action of the transport control unit 5 described later, the discharged water (including the water from the biological septic tank 3) is supplied depending on the situation. There can be a state where it is supplied and a state where it is not supplied at all.

The electrolysis tank 4 purifies the supplied discharged water by electrolysis. Specifically, the pollution contained in the discharged water is purified by hypochlorous acid generated at the stage where the discharged water containing chlorine is electrolyzed. The decomposition of this pollution purifies the discharged water. Of course, the water supplied from the biological septic tank 3 is also purified by electrolysis.

Here, the electrolysis tank 4 decomposes pollution by electrolysis. Therefore, electric power energy is required in electrolysis. Therefore, if the amount and time of the discharged water to be purified in the electrolysis tank 4 are increased, there is a problem that the consumption of electric power energy increases. Increasing is not preferable in terms of cost and environmental load.

The concentration measuring unit 20 measures the dissolved oxygen concentration in the discharged water. The discharged water is discharged from the storage container 101 in which aquatic organisms are active. Aquatic organisms are active in the storage container 101, and as a result of the activity, the dissolved oxygen concentration changes. Since aquatic organisms naturally breathe inside the storage container 101, they consume the dissolved oxygen dissolved in the water contained in the storage container 101. Since the normal activity of aquatic organisms includes excretion, the ammonia component, which is the main component of pollution, increases as the dissolved oxygen is consumed.

In addition, the storage container 101 is regularly fed with food to aquatic organisms. This is to sustain the biological activity of aquatic organisms by being fed. When given this food, aquatic organisms eat it. As a result of eating, digestive activity also begins. This digestive activity consumes dissolved oxygen. Furthermore, dissolved oxygen is consumed by excretion following digestion.

Here, the dissolved oxygen concentration is reduced by the above-mentioned normal biological activity, the activity of eating the food, the activity of digesting the food, the activity of excreting by digestion, and the like. At the same time, such activities increase the polluted ammonia component. This is because the ammonia component increases in response to respiration and excretion due to biological activity. That is, there is an inverse correlation between the increase in the ammonia component and the decrease in the dissolved oxygen concentration.

The concentration measuring unit 20 can estimate the ammonia component concentration by measuring the dissolved oxygen concentration. That is, the concentration of the ammonia component in the discharged water (that is, the water inside the storage container 101) can be estimated from the dissolved oxygen concentration measured by the concentration measuring unit 20. The concentration measurement unit 20 outputs the concentration result, which is the measurement result, to the transportation control unit 5.

The transport control unit 5 controls the flow rate of water to each of the biological septic tank 3 and the electrolysis tank 4 based on the concentration result in the concentration measurement unit 20. More specifically, the transport control unit 5 transports substantially the entire amount of the discharged water from the storage container 101 to the biological septic tank 3 based on the concentration result, or transports the discharged water to the biological septic tank 3 and the electrolysis tank 4, respectively. Choose to be shipped to.

As explained in the inventor's analysis, in order to suppress energy consumption while sufficiently purifying the discharged water, if the purification in the biological septic tank 3 is sufficient, the discharged water is purified only in the biological septic tank 3 to purify the organism. When the septic tank 3 is insufficient, it is preferable to purify the biological septic tank 3 and the electrolysis tank 4 in parallel.

Therefore, based on the concentration result, the transport control unit 5 may be used for transporting substantially the entire amount of the discharged water only to the biological septic tank 3 or for transporting the discharged water to both the biological septic tank 3 and the electrolysis tank 4. Controls. As mentioned above, it is difficult to directly measure the ammonia component concentration of the discharged water. On the other hand, it is easy to measure the dissolved oxygen concentration. The measured dissolved oxygen concentration result has an inverse correlation with the ammonia component concentration. Based on this inverse correlation, the transport control unit 5 selects the transport destination of the discharged water based on the concentration result.

By purifying in the biological septic tank 3, the discharged water is purified and the biological purified water is obtained. Similarly, the discharged water is electrolyzed and purified in the electrolysis tank 4, and the decomposed purified water is obtained. The biological septic tank 3 outputs biological purified water after purification. The electrolysis tank 4 outputs electrolytically purified water after purification. The recirculation mechanism 6 recirculates these biological purified water and electrolytic purified water to the storage container 101. That is, the purified water after purifying the discharged water containing the pollution discharged from the storage container 101 is returned to the storage container 101. As a result, the water inside the storage container 101 that houses the aquatic organisms is kept clean.

The purified water purified by the biological septic tank 3 and the electrolysis tank 4 by the reflux mechanism 6 is sent back to the storage container 101 again. By being returned, the purified water is resupplied to the storage container 101. In this way, purified water is constantly supplied to the storage container 101 to maintain the biological activity and survival of aquatic organisms.

In particular, when the aquatic organism storage device 100 is provided in the transportation equipment, it is difficult to appropriately supply the water (for example, seawater) required for the aquatic organisms to the storage container 101. Even in such a case, it is convenient to have a system in which the water purified by the water purification device 1 recirculates one after another.

Of course, even with the aquatic organism storage device 100 that is stationary in restaurants and aquaculture facilities, it may be difficult to constantly supply the water necessary for the biological activity of aquatic organisms. This is because it is difficult to frequently transport and supply seawater suitable for the type of aquatic organism and the fishing area in the case of seawater. Even in such a case, it is convenient that the discharged water is purified one after another by the water quality purification device 1 and returned to the storage container 101. This is because the water required for the biological activity and survival of aquatic organisms can be constantly supplied.

In the process of producing purified water to be recirculated, the balance between maintaining a sufficient purification level and energy consumption can be optimally taken.

As described above, the water quality purification device 1 according to the first embodiment can realize the purification of discharged water having a balance between the purification capacity and the energy consumption based on the dissolved oxygen concentration.

(Dissolved oxygen concentration and ammonia component concentration)
FIG. 3 is a graph showing an inverse correlation between the dissolved oxygen concentration and the ammonia component concentration. As described above, dissolved oxygen is consumed with various biological activities of aquatic organisms contained in the storage container 101. Ammonia component concentration increases with this consumption. When biological activity becomes active, dissolved oxygen is naturally consumed, and the dissolved oxygen concentration decreases. On the other hand, if biological activity becomes active (or if it progresses integrally), the concentration of ammonia components will increase due to excretion from aquatic organisms.

As described above, there is an inverse correlation with the decrease in the dissolved oxygen concentration and the increase in the ammonia component concentration (and vice versa). Therefore, it has a graph relationship as shown in FIG. When the dissolved oxygen concentration decreases, the ammonia component concentration increases, and when the purified purified water returns to the storage container 101, the dissolved oxygen concentration increases and the ammonia component concentration decreases.

It is difficult to directly measure the ammonia component concentration because the equipment becomes large and the cost increases. In addition, the real-time performance of the measurement is also poor (as explained in the inventor's analysis). On the other hand, it is easy to measure the dissolved oxygen concentration.

For example, a sensor device that uses the diaphragm electrode method or a sensor device that uses the fluorescence method can be used to measure the dissolved oxygen concentration.

In the case of a sensor device that uses the diaphragm electrode method, when it is immersed in discharged water, electricity is applied between the electrodes that make up the device. Since the current value when energized changes depending on the dissolved oxygen concentration, the dissolved oxygen concentration can be measured by measuring the current value. Since the dissolved oxygen concentration is measured from the current value, the dissolved oxygen concentration in the discharged water is measured with high real-time performance.

In a sensor device that uses the fluorescence method, the dissolved oxygen concentration is increased by utilizing the phenomenon that the fluorescence emitted from the fluorescent substance excited by the light of the blue LED (light emitting diode) is quenched by the transmitted oxygen. It is measured. That is, the higher the dissolved oxygen concentration, the stronger the quenching phenomenon, so that the fluorescence detected by the detector (light receiving diode) decreases. Based on this change, the dissolved oxygen concentration can be measured.

Even when a sensor device using such a fluorescence method is used, the dissolved oxygen concentration can be measured due to its high real-time performance. Methods other than these may be used. In addition, if the dissolved oxygen concentration is measured by either method, the ammonia concentration having an inverse correlation with this can be estimated with high accuracy, which can be used to switch the transport destination of the discharged water in the water purification device 1. ..

In this way, the concentration measuring unit 20 measures the dissolved oxygen concentration and outputs it to the transport control unit 5.

(Control by transport control unit)
Based on the concentration result, the transport control unit 5 transports the discharged water from the storage container 101 to only the biological septic tank 3 or to both the biological septic tank 3 and the electrolysis tank 4. FIG. 4 is a graph showing the concentration result in the concentration measuring unit according to the first embodiment of the present invention. When the dissolved oxygen concentration of the discharged water from the storage container 101 is measured, it becomes as shown in the graph of FIG.

The dissolved oxygen concentration decreases with the biological activity of aquatic organisms in the storage container 101. When the purified water in the water purification device 1 recirculates (by recirculating the purified water after oxygen is dissolved in the oxygen supply unit 110), the dissolved oxygen concentration of the water inside the storage container 101 rises again. .. Since the discharged water is in the same state as the water inside the storage container 101, measuring the dissolved oxygen concentration of the discharged water is the same as measuring the dissolved oxygen concentration of the water inside the storage container 101.

FIG. 4 shows a line of predetermined values in the concentration result of the dissolved oxygen concentration. The predetermined value reaches a certain standard for the dissolved oxygen concentration, which indicates that the concentration of the ammonia component, which is a pollutant component, exceeds the standard. If it is less than this predetermined value, the concentration of ammonia components becomes high, and purification of only the biological septic tank 3 is insufficient.

The predetermined value is a reference value for determining whether the purification only in the biological septic tank 3 is sufficient or insufficient in this way. The predetermined value may be appropriately determined depending on the capacity of the storage container 101, the type and number of aquatic organisms, the purification capacity of the biological septic tank 3 and the electrolysis tank 4, and the like. It may also be modified or changed as it is used.

When the concentration result is equal to or higher than a predetermined value, the transport control unit 5 transports substantially the entire amount of the discharged water from the storage container 101 to the biological septic tank 3. This is because when the dissolved oxygen concentration, which is the result of the concentration, is equal to or higher than a predetermined value, the pollution level has not yet become too high, and the biological septic tank 3 alone can sufficiently purify. The transport control unit 5 controls the pipeline of the transport mechanism 2 (for example, by switching valves) to transport substantially the entire amount of the discharged water from the storage container 101 to the biological septic tank 3.
As shown in FIG. 4, during the period when the concentration result is equal to or higher than a predetermined value, the transport control unit 5 transports substantially the entire amount of the discharged water to the biological septic tank 3. By this transportation, substantially the entire amount of discharged water is purified by decomposing the ammonia component in the biological septic tank 3. When purified, the biological purified water is output from the biological septic tank 3 and returned to the storage container 101 by the reflux mechanism 6. In the process of this reflux, oxygen is supplied to the biological purified water by the oxygen supply unit 110. The biological purified water in which oxygen is dissolved and the dissolved oxygen concentration is increased is refluxed to the storage container 101.

On the other hand, when the concentration result is less than a predetermined value, the transport control unit 5 transports the discharged water from the storage container 101 to both the biological septic tank 3 and the electrolysis tank 4. FIG. 4 shows the transportation period to both of them.

If the concentration result is less than the predetermined value, it indicates that the ammonia component concentration is considerably increased. In particular, it shows that purification can be insufficient only with the biological septic tank 3. Therefore, when the concentration result is less than a predetermined value, the transport control unit 5 transports the discharged water from the storage container 101 to both the biological septic tank 3 and the electrolysis tank 4.

Here, the transportation control unit 5 may also control the flow rate to each of the biological septic tank 3 and the electrolysis tank 4. By controlling the flow rate, the amount of discharged water exceeding the purification capacity is transported to the electrolysis tank 4 while preventing the purification capacity of the biological septic tank 3 from being exceeded. Since only the amount exceeding the purification capacity is transported to the electrolysis tank 4, the energy consumption of the electrolysis tank 4 can be minimized.

For example, the amount of discharged water that can be purified in the biological septic tank 3 is transported to the biological septic tank 3, and the remaining amount of discharged water is transported to the electrolysis tank 4. In this way, the transportation control unit 5 controls not only the transportation destination but also the amount of water to the transportation destination. Alternatively, an amount of discharged water smaller than the amount that can be purified by the biological septic tank 3 may be transported to the biological septic tank 3, and the remaining amount may be transported to the electrolysis tank 4. Alternatively, the discharged water may be divided into predetermined proportions, a certain proportion may be transported to the biological septic tank 3, and the remaining proportion of the discharged water may be transported to the electrolysis tank 4.

By controlling the transportation destination and the amount of water by the transportation control unit 5, it is possible to transport an amount exceeding the purification capacity to the electrolysis tank 4 and minimize the energy consumption of the electrolysis tank 4.

(Discharged water)
The discharged water is discharged from the storage container 101. This discharged water contains pollution derived from aquatic organisms engaged in biological activity in the storage container 101. Pollution is caused by the normal biological activities of aquatic organisms, ovulation, ovulation, and digestive activity by eating food.

When the aquatic organism storage device 100 stores, stores, and transports the aquatic organisms alive, contamination derived from the aquatic organisms is surely generated in the storage container 101. Therefore, the discharged water contains this pollution.

FIG. 5 is a schematic view of the storage container according to the first embodiment of the present invention. The storage container 101, which is an element constituting the aquatic organism storage device 100, is schematically shown. The storage container 101 contains aquatic organisms inside. In FIG. 5, squids 200 are housed as an example. Naturally, the storage container 100 contains water necessary for the biological activity of the squids 200. In addition, food necessary for the biological activity of the squid 200 is also supplied.

The squid 200 produces excrement by eating this food. It also produces secretions such as body fluids and ovulates eggs. In addition, it produces various emissions through biological activities. Combined with these emissions, pollution derived from aquatic organisms accumulates inside the storage container 101.

The storage container 101 includes a discharge unit 102. The storage container 101 is provided with a lid 103, and the inside can be sealed. In this closed state, purified purified water (or new water supplied from another route) is supplied to the inside of the storage container 101 via the reflux mechanism 6. These purified waters and the like are supplied from the supply port 104.

Since it is sealed by the lid 103, if purified water or the like is continuously supplied, the storage container 101 will be in a state of overflowing. This overflowing water overflows from the discharge unit 102. Due to this overflow, an excess amount of water is discharged to the transport mechanism 2. This becomes discharged water and is transported to the water purification device 1.

This discharged water contains the above-mentioned pollution derived from aquatic organisms. Depending on the type of pollutant component, the pollutant component easily moves above the storage container 101, and as the excess water overflows from the discharge portion 102 above, the polluted discharged water is discharged to the transportation mechanism 2. Will be done. Of course, the discharged water may be discharged by suction with a pump or the like other than the overflow of water due to sealing.

The discharged water contains pollution as described above, and the biological septic tank 3 and the electrolysis tank 4 in which the discharged water containing the pollution is transported to the biological septic tank 3 and the electrolysis tank 4 purify or purify the pollution. Disassemble.

Here, the concentration result of the dissolved oxygen concentration measured by the concentration measuring unit 20 is related to an increase in the concentration of the ammonia component in the water of the storage container 101. By relating, the processing described with reference to FIGS. 3 and 4 is realized.

(Purification in biological septic tank and electrolysis tank)

The biological septic tank 3 decomposes the pollution contained in the discharged water by the biological activity of microorganisms. The electrolysis tank 4 decomposes the pollution contained in the discharged water by the action of electrolysis.

Pollution contains an ammonia component. Of course, it also contains other ingredients. The biological septic tank 3 decomposes the ammonia component by microorganisms. The electrolysis tank 4 decomposes the ammonia component by generating hypochlorous acid by electrolysis.

The biological septic tank 3 contains microorganisms suitable for the type and amount of contamination derived from aquatic organisms. Alternatively, it contains microorganisms suitable for the type and characteristics of aquatic organisms. The biological activity of this selected microorganism decomposes the ammonia component. Through the decomposition of the ammonia component, the biological septic tank 3 purifies the pollution of the supplied discharged water. By purification, the biological purified water after purification is output. This biological purified water is refluxed to the storage container 101 by the reflux mechanism 6.

Here, the microorganisms contained in the biological septic tank 3 include a first microbial group that decomposes the ammonia component and a second microbial group that decomposes nitrite generated by decomposing the ammonia component. The roles of the first microbial group and the second microbial group are different.

The first group of microorganisms decomposes the ammonia component and changes it to nitrite. The second group of microorganisms decomposes nitrite. As a result of these two-step decomposition, the ammonia component is transformed into a harmless component. In this way, the biological septic tank 3 purifies the pollution and obtains the purified biological purified water. When this returns to the storage container 101, purified water suitable for living of aquatic organisms continues to be supplied to the storage container 101.

The electrolysis tank 4 decomposes the ammonia component in a state where hypochlorous acid is generated. In the water purification device 1, the electrolysis tank 4 utilizes chlorine contained in seawater for electrolysis, whereby hypochlorous acid is generated. This hypochlorous acid purifies the pollution.

Utilizing the generation of hypochlorous acid, the electrolysis tank 4 decomposes the ammonia component. Pollution is purified by this decomposition. By this purification, electrolytic purified water after purification can be generated, and the purified water can be refluxed to the storage container 101 through the reflux mechanism 6.

Similar to biological purified water, the discharged water once polluted is changed to purified electrolytic purified water, and purified water suitable for living aquatic organisms is supplied.

In this way, each of the biological septic tank 3 and the electrolysis tank 4 decomposes the ammonia component by different mechanisms. Through the decomposition of this ammonia component, the pollution is decomposed and the discharged water is purified.

The electrolysis tank 4 is not always supplied with discharged water, and in some cases, discharged water is supplied. Only when this is supplied, the electrolysis tank 4 may perform electrolysis. Therefore, for example, it is also preferable that the transport control unit 5 activates the electric power for electrolysis of the electrolysis tank 4 when supplying (transporting) the discharged water to the electrolysis tank 4. Only in a state where electrolysis in the electrolysis tank 4 is required, the electrolysis tank 4 consumes electric power energy. As a result, the power consumption of the water purification device 1 can be reduced.

The aquatic organism storage device 100 can maintain the biological activity of the aquatic organism by continuously supplying the purified water from each of the biological septic tank 3 and the electrolysis tank 4 to the storage container 101. In particular, by circulating the water contained in the storage container 101 from pollution to purification, it is possible to maintain the life of aquatic organisms even in a state where it is difficult to supply water to the storage container 101 from the outside.

For example, when the aquatic organism accommodating device 100 is provided in a transportation device such as a truck and used for transportation, it is difficult to appropriately supply seawater or the like required for aquatic organisms. Alternatively, even if it is installed in a restaurant or the like as a cage, it is difficult to appropriately supply seawater or the like required for aquatic organisms. Even in such a case, the water purification device 1 continues the cycle in which the water initially contained in the storage container 101 is purified and refluxed. As a result, it is possible to reduce the continuation of supply of new seawater and the like, and to maintain a healthy living state of aquatic organisms in the aquatic organism accommodating device 100.

The electrolysis tank 4 may be supplied with not only the water discharged from the storage container 101 but also the water from the biological septic tank 3. In this case, water that exceeds the treatment in the biological septic tank 3 or biological purified water that has been decomposed by microorganisms in the biological septic tank 3 is supplied to the electrolysis tank 4. By this supply, the electrolysis tank 4 also purifies the water from the biological septic tank 3 by electrolysis.

(Activated carbon tank)
FIG. 6 is a block diagram of the water quality purification device according to the first embodiment of the present invention. The water quality purification device 1 of FIG. 6 includes an activated carbon tank 8. The activated carbon tank 8 removes hypochlorous acid generated in the electrolysis tank 4. Therefore, it is provided at the tip of the output from the electrolysis tank 4. In the electrolysis tank 4, hypochlorous acid is generated in the process of electrolysis. By utilizing this hypochlorous acid, in the electrolysis tank 4, pollution such as an ammonia component is decomposed and purified.

By this purification, the electrolysis tank 4 outputs the purified electrolytic purified water. However, the output electrolytically purified water is in a state of containing hypochlorous acid output from the electrolysis tank 4. Since the activated carbon tank 8 is provided ahead of the output of the electrolysis tank 4, the electrolytic purified water output from the electrolysis tank 4 passes through the activated carbon tank 8.

The activated carbon tank 8 includes activated carbon. This activated carbon reduces hypochlorous acid contained in electrolytically purified water. By this reduction, the activated carbon tank 8 can remove hypochlorous acid from the electrolytically purified water.

As a result of this removal, the electrolytically purified water that is finally refluxed from the reflux mechanism 6 to the storage container 101 is refluxed in a state in which it contains almost no hypochlorous acid. As a result, the storage container 101 is circulated and supplied with water that is more suitable for the life of aquatic organisms, in which hypochlorous acid has been removed in addition to being purified.

(Oxygen supply section)
Further, as shown in FIG. 6, it is also preferable that the water quality purification device 1 includes an oxygen supply unit 110. The oxygen supply unit 110 may be grasped as an element included in the water quality purification device 1, or may be grasped as an element included in the aquatic organism accommodating device 100.

The oxygen supply unit 110 dissolves oxygen in the purified water in the process in which the biological purified water and the electrolytic purified water purified in each of the biological septic tank 3 and the electrolysis tank 4 are returned to the storage container 101. The purified water that has been purified and refluxed receives the supply of oxygen by the oxygen supply unit 110, increases the oxygen concentration, and refluxes to the storage container 101.

Aquatic organisms are contained in the storage container 101. Due to the biological activity of aquatic organisms, the dissolved oxygen in the water inside the container 101 is reduced. After the dissolved oxygen is reduced, the discharged water is purified. Therefore, even if it is purified and the pollutant component is reduced, the concentration of dissolved oxygen remains low.

When the oxygen supply unit 110 dissolves oxygen in the purified water, the dissolved oxygen concentration of the water returned to the storage container 101 can be returned to an appropriate level. By restoring the dissolved oxygen concentration together with the purification, the water circulated in the water purification device 1 can be used again in the storage container 101 for the biological activity of aquatic organisms.

As a result, even in an environment where the water necessary for the survival of aquatic organisms cannot be sufficiently supplied from the outside, the biological activity of aquatic organisms in the storage container 101 is maintained by repeatedly purifying and circulating the water. Can be stored.

As described above, the water purification device 1 in the first embodiment can detect an increase in the concentration of the ammonia component, which is difficult to measure directly, by measuring the dissolved oxygen concentration, and can purify the discharged water by an optimum method. .. In particular, by switching between using only the biological septic tank 3 or using both the biological septic tank 3 and the electrolysis tank 4 based on the concentration result, it is possible to realize a balance between energy consumption saving and reliable purification.

(Embodiment 2)

Next, the second embodiment will be described. In the second embodiment, various variations of the timing of switching the discharged water from only the biological septic tank 3 to transport the discharged water to both the biological septic tank 3 and the electrolysis tank 4 will be described.

(Part 1: Switching at the first timing when the concentration regret becomes less than the predetermined value)
FIG. 7 is a schematic view showing switching of the transport destination of the discharged water in the second embodiment of the present invention. In FIG. 7, the transport control unit 5 sets the first timing at which the concentration result of the dissolved oxygen concentration measured by the concentration measurement unit 20 becomes less than a predetermined value as the switching timing.

Until the concentration result reaches the first timing, the transport control unit 5 transports substantially the entire amount of the discharged water from the storage container 101 to the biological septic tank 3. At the first timing, the transport control unit 5 transports the discharged water from the storage container 101 (to each) to both the biological septic tank 3 and the electrolysis tank 4.

As described above, the fact that the concentration result is less than the predetermined value indicates that the ammonia component, which is the center of pollution, exceeds the predetermined value, as explained in FIG. Although it is difficult to measure the ammonia concentration directly, the ammonia concentration can be measured indirectly from the measurement of the dissolved oxygen concentration. Utilizing this, from the concentration result obtained by measuring the dissolved oxygen concentration in the concentration measuring unit 20, the transport destination can be set to both in consideration of the ability to purify the discharged water.

At this first timing, the transport control unit 5 sets the transport destination of the discharged water to both the biological septic tank 3 and the electrolysis tank 4, so that the ammonia concentration increases and the pollution state exceeds the purification capacity of the biological septic tank 3. The discharged water can be purified by using the electrolysis tank 4. By automatically switching this, it is possible to switch the transportation destination suitable for the pollution level.

If the pollution level is below a certain level, the discharged water is purified only by the biological septic tank 3 that can suppress energy consumption. When the pollution level exceeds a certain level, the discharged water is purified in both the biological septic tank 3 and the electrolysis tank 4. As a result, sufficient purification can be realized even for discharged water with a high pollution level. In addition, energy consumption can be suppressed as a whole. As a result, a balance between purification of pollution and reduction of energy consumption can be achieved.

(Part 2: Switching at the second timing after the first timing)
FIG. 8 is a schematic view showing switching of the transport destination of the discharged water according to the second embodiment of the present invention. In FIG. 8, the discharged water from the storage container 101 is transported to both the biological septic tank 3 and the electrolysis tank 4 at the second timing when a predetermined time has elapsed from the first timing described with reference to FIG. That is, until the second timing, the transport control unit 5 transports substantially the entire amount of discharged water to the biological septic tank 3. At the second timing, the transport control unit 5 switches to transport the discharged water from the storage container 101 to both the biological septic tank 3 and the electrolysis tank 4.

By switching at the second timing after a predetermined time has elapsed from the first timing, the operating time of the electrolysis tank 4 that consumes electric energy can be reduced as much as possible while fully utilizing the purification capacity of the biological septic tank 3. Can be done. As a result, the suppression of energy consumption can be further strengthened.

Further, even if the concentration result is less than a predetermined value, there may be a deviation from the estimation of the ammonia concentration from the dissolved oxygen concentration. Therefore, it may be preferable to determine that the ammonia concentration is equal to or higher than the predetermined value at the second timing after the predetermined time after the concentration result indicating the dissolved oxygen concentration becomes less than the predetermined value.

In view of such a situation, it is also preferable that the transport control unit 5 switches the transport destination of the discharged water at the second timing when a predetermined time has elapsed from the first timing.

Further, the amount of time from the first timing to the second timing (predetermined time after a predetermined time elapses) is at least one of the type of aquatic organism contained in the storage container 101 and the time from the diet of the aquatic organism to the start of digestion. It is also preferable that it is determined based on.

The amount of time from the first timing when the concentration result, which is the dissolved oxygen concentration, becomes less than a predetermined value to the second timing when the transportation destination should be switched, may change depending on the type of aquatic organism. The amount of time absorbs the deviation of the inverse correlation between the dissolved oxygen concentration and the actual pollution ammonia component concentration. Therefore, it is preferable that this amount of time is determined by the type of aquatic organism. Alternatively, the amount of time may be determined based on the time from the diet of the aquatic organism to the start of digestion. Of course, it may be based on both the type and the time to start digestion.

In this way, by using the second timing in which the characteristics of the aquatic organism are matched with the concentration result of the dissolved oxygen concentration as a reference, the transport destination of the discharged water can be switched at a more appropriate timing.

(Part 3: Switching based on the feeding time)
FIG. 9 is a schematic view showing switching of the transport destination of the discharged water in the second embodiment of the present invention. In FIG. 9, the transportation destination switching timing is set based on the calculation result of the charging start time of feeding the bait for aquatic organisms into the storage container 101 and the digestion start time determined by the type of aquatic organisms.

The time at which the bait is charged into the storage container 101 can be grasped. When food is added, aquatic organisms eat it. When eaten, aquatic organisms begin digestive activity some time after they start eating. When digestion is performed, activity becomes active and excretion begins. As a result, the concentration of ammonia components in the water inside the storage container 101 increases.

The amount of time from the feeding time to the start of digestion has an inverse correlation depending on the type of aquatic organism. Therefore, it is possible to calculate the digestion start time based on the input time. For example, the digestion start time can be calculated depending on whether the aquatic organism is a squid or a mackerel.

As described above, this digestion start time indicates an increase in the contamination level (ammonia component concentration) of the water inside the storage container 101. Based on this, the transport control unit 5 transports substantially the entire amount of the discharged water to the biological septic tank 3 or transports the discharged water to each of the biological septic tank 3 and the electrolysis tank 4 based on the digestion start time. Choose that.

As shown in FIG. 9, the transport control unit 5 transports substantially the entire amount of discharged water to the biological septic tank 3 until the digestion start time. Until the digestion start time, the discharged water is transported to each of the biological septic tank 3 and the electrolysis tank 4.

As a result, sufficient purification of discharged water can be realized in response to an increase in the contamination concentration after the digestion start time.

FIG. 10 is a schematic view showing switching of the transport destination of the discharged water in the second embodiment of the present invention. FIG. 10 shows a variation in which the transportation destination is switched at the third timing when a predetermined time has elapsed from the digestion start time.

As shown in FIG. 9, the transport control unit transports substantially all of the discharged water to the biological septic tank 3 until the digestion start time, and after the digestion start time, transports the discharged water to the biological septic tank 3 and the electrolysis tank 4. You may do it.

On the other hand, as shown in FIG. 10, the third timing in which a predetermined time has elapsed from the digestion start time may be used as a reference. Until this third timing, substantially the entire amount of the discharged water is transported to the biological septic tank 3, and after the third timing, the discharged water is transported to both the biological septic tank 3 and the electrolysis tank 4. By using this third timing as a reference, it becomes possible to more appropriately respond to an increase in the ammonia concentration due to digestive activity, shorten the operating time of the electrolysis tank 4, and suppress energy consumption.

By using the third timing as shown in FIG. 10 as a reference, it is possible to further suppress the energy consumption of the entire water quality purification device 1 while realizing the purification that is matched by the increase in the pollution concentration.

(Application in transportation equipment)
FIG. 11 is a schematic view in which the transport device according to the second embodiment of the present invention is provided with an aquatic organism accommodating device. The water quality purification device 1 described in the first and second embodiments and the aquatic organism storage device 100 connected thereto are loaded on the transportation device 300. The transportation device 300 is, for example, a truck or a live fish transport vehicle. Of course, it may be a ship or a railroad vehicle.

There are many needs for aquatic organisms to be transported alive by such a transport device 300. It may be necessary to transport it from the fishing area to the consumption area, or it may be transported from a certain storage area to a store where it is consumed. In FIG. 11, squids 200 are housed as aquatic organisms. Live squids 200 are housed in the aquatic organism containment device 100 because they are needed alive at the destination. In this state, it is transported by the transportation device 300.

Further, it is difficult to continue to supply seawater or the like required from the outside to the aquatic organism accommodating device 100 by being transported by the transportation device 300. Therefore, it is required to repeatedly use the seawater or the like initially supplied to the storage container 101 of the aquatic organism storage device 100 while purifying it.

The water quality purification device 1 described in the first and second embodiments is also loaded on the transportation device 300. The water quality purification device 1 is connected to the aquatic organism accommodating device 100 by the transportation mechanism 2 and the reflux mechanism 6. This connection enables the exchange of water circulation.

As described in the first and second embodiments, the water quality purification device 1 purifies and recirculates the discharged water from the aquatic organism accommodating device 100. By this circulation, when the transportation device 300 is loaded and transported, even if it is difficult to supply seawater or the like from the outside, the aquatic organisms can be transported while being alive. The aquatic organism accommodating device 100 and the water quality purification device 1 perform the operations as described in the first and second embodiments. As a result, it is possible to maintain the biological activity of aquatic organisms even in transportation where it is difficult to supply water from the outside.

The water quality purification device 1 described in the first and second embodiments is an example for explaining the gist of the present invention, and includes deformation and modification within a range not deviating from the gist of the present invention.

1 Water purification device 2 Transport mechanism 3 Biological septic tank 4 Electrolysis tank 5 Transport control unit 6 Circulation mechanism 8 Activated carbon tank 9 Measurement unit 10 Electrolysis tank control unit 11 Transport route 20 Concentration measurement unit 100 Aquatic organism storage device 101 Storage container 102 Discharge Part 103 Lid 104 Supply port

Claims (14)

A transportation mechanism that transports discharged water discharged from a storage container that can accommodate aquatic organisms,
A transportation mechanism that transports discharged water discharged from a storage container that can accommodate aquatic organisms,
A biological septic tank that biologically purifies the discharged water transported by the transportation mechanism,
An electrolysis tank that purifies at least a part of the discharged water transported by the transportation mechanism and the water discharged from the biological septic tank by electrolysis.
A concentration measuring unit that measures the dissolved oxygen concentration in the discharged water,
A transport control unit that controls at least one of the transport destination and the flow rate of the discharged water to each of the biological septic tank and the electrolysis tank based on the concentration result measured by the concentration measuring unit.
A recirculation mechanism for returning the biological purified water purified in the biological septic tank and the decomposed purified water purified in the electrolysis tank to the storage container is provided.
Based on the concentration result, the transport control unit selects to transport substantially the entire amount of the discharged water to the biological septic tank, and to transport the discharged water to each of the biological septic tank and the electrolysis tank. Water purification device for biological containment device. The water purification unit for the aquatic organism storage device according to claim 1, wherein the transport control unit transports substantially the entire amount of water discharged from the storage container to the biological septic tank when the concentration result is equal to or higher than a predetermined value. Device. The aquatic organism storage according to claim 2, wherein the transport control unit transports the discharged water from the storage container to both the biological septic tank and the electrolysis tank when the concentration result is less than the predetermined value. Water purification device for the device. Claim 2 or 3 that the transport control unit transports the discharged water from the storage container to both the biological septic tank and the electrolysis tank at the first timing when the concentration result becomes less than the predetermined value. A water purification device for the described aquatic organism containment device. The transport control unit supplies the discharged water from the storage container to both the biological septic tank and the electrolysis tank at the second timing when a predetermined time has elapsed from the first timing when the concentration result becomes less than the predetermined value. The water purification device for the aquatic organism storage device according to claim 2 or 3, which is transported to the water purification device. The amount of time from the first timing to the second timing is determined based on at least one of the type of aquatic organism contained in the storage container and the time from the diet of the aquatic organism to the start of digestion. 5. The water purification device for the aquatic organism storage device according to 5. The concentration measuring unit calculates the digestion start time determined by the type of the aquatic organism based on the charging time when the bait for the aquatic organism is charged into the storage container.
Based on the digestion start time, the transport control unit selects to transport substantially the entire amount of the discharged water to the biological septic tank, and to transport the discharged water to each of the biological septic tank and the electrolysis tank. The water purification device for the aquatic organism containment device according to claim 1. The transport control unit transports substantially the entire amount of the discharged water to the biological septic tank until the digestion start time, and after the digestion start time, transports the discharged water to the biological septic tank and the electrolysis tank, respectively. Let me
or,
The transport control unit transports substantially the entire amount of the discharged water to the biological septic tank until the third timing when a predetermined time elapses from the digestion start time, and after the third timing, the discharged water is transported to the biological septic tank. The water purification device for the aquatic organism storage device according to claim 7, which is transported to each of the electrolysis tanks. The transportation control unit controls the flow rate to each of the biological septic tank and the electrolysis tank when the discharged water from the storage container is transported to both the biological septic tank and the electrolysis tank. The water purification device for the aquatic organism storage device according to any one of 3 to 8. The discharged water from the storage container contains pollution derived from the aquatic organism.
The water purification device for an aquatic organism accommodating device according to any one of claims 1 to 9, wherein the biological septic tank and the electrolysis tank purify or decompose the pollution. The pollution contains an ammonia component and contains
The biological septic tank decomposes the ammonia component by microorganisms and decomposes the ammonia component.
The water purification device for an aquatic organism accommodating device according to claim 10, wherein the electrolysis tank decomposes the ammonia component by generating hypochlorous acid by electrolysis. The water purification device for an aquatic organism storage device according to claim 11, wherein the concentration result is related to an increase in the concentration of ammonia components in the water of the storage container. The water purification device for an aquatic organism accommodating device according to claim 11 or 12, further comprising an activated carbon tank for removing the hypochlorous acid generated in the electrolysis tank. The aquatic organism according to any one of claims 11 to 13, wherein the microorganism includes a first group of microorganisms that decomposes the ammonia component and a second group of microorganisms that decomposes nitrite generated by decomposing the ammonia component. Water purification device for containment device.

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