Aquaculture container water cleaning system

Abstract

[Problem] To provide an aquaculture container water cleaning system that makes it possible to maintain high filtration performance by means of simple maintenance and thereby makes it possible to keep the water in an aquaculture container clean without replacing the water. [Solution] An aquaculture container water cleaning system 100 comprises a water passage vessel 120 through which water sucked from an aquaculture container 200 can pass, cassettes 121a, 121b that are removably installed in the water passage vessel 120 and allow water to pass therethrough, a physical filtration filter 130 that is accommodated in cassette 121a and physically filters water sucked from the aquaculture container 200, a bacteria-carrying filter 140 that is accommodated in cassette 121b and filters water but carries bacteria included in the water filtered by the physical filtration filter 130, a bacteria control device 150 that is provided outside the water passage vessel 120, sprays millimeter or micrometer ozone bubbles into the water that has passed through the bacteria-carrying filter 140 to reduce and thereby control bacteria, and returns the water to the aquaculture container 200, and a control unit 180 that controls the drive of the bacteria control device 150.

Description

Fish tank water purification system

[0001] The present invention relates to a fish cage water purification system.

[0002] For example, Patent Document 1 discloses a configuration in which water from a fish pond is pumped out and passed through a filtration device, ozone is mixed in a water storage tank, and then the water is converted into water containing nanobubbles using an ozone nano-nozzle device and returned to the fish pond.

[0003] Japanese Patent Application Laid-Open No. 2018-93852

[0004] However, the technology of Patent Document 1 does not disclose the specific configuration of the filtration device. It is conceivable to use coral or the like as a filter material for the filtration device, but such filter material is not easy to maintain. Furthermore, no matter how much maintenance is done on the filter material, there is a limit to how much the filtration function can be maintained. Ultimately, it is difficult to keep the fish tank clean unless the water in the fish tank is changed regularly.

[0005] In view of these problems, the present invention aims to provide a fish cage water purification system that can maintain high filtration function with simple maintenance and therefore can continue to purify water without changing the water in the fish cage.

[0006] In order to solve the above problems, a representative configuration of the present invention is a fish cage water purification system that purifies water absorbed from a fish cage outside the fish cage and returns it to the fish cage, and is characterized by comprising: a water passing container through which the water absorbed from the fish cage can pass; first and second cassettes that are detachably attached to the water passing container and through which the water can pass; a physical filtration filter that is housed in the first cassette and physically filters the water absorbed from the fish cage; a bacteria-carrying filter that is housed in the second cassette and filters the water while carrying the bacteria contained in the water filtered by the physical filtration filter; a bacteriostatic device that injects millimeter or micron ozone bubbles into the water that has passed through the water passing container to inhibit bacteria so as to reduce the number of bacteria and return the water to the fish cage; and a control unit that controls the operation of the bacteriostatic device.

[0007] According to the present invention, it is possible to provide a fish cage water purification system that can maintain high filtration function with simple maintenance and therefore can continue to purify water without changing the water in the fish cage.

[0008] Fig. 1 is a perspective view of a live fish cage water purification system according to an embodiment of the present invention. Fig. 2 is a photograph of a physical filtration filter used in the live fish cage water purification system of Fig. 1. Fig. 3 is a photograph of a bacteria-carrying filter and bacteria-carrying filter pieces used in the live fish cage water purification system of Fig. 1. Fig. 4 is a conceptual diagram of the live fish cage water purification system of Fig. 1.

[0009] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Dimensions, materials, and other specific values ​​shown in these embodiments are merely examples for facilitating understanding of the invention and, unless otherwise specified, do not limit the present invention. In this specification and drawings, elements having substantially the same functions and configurations are designated by the same reference numerals to avoid redundant explanation, and elements not directly related to the present invention are not shown.

[0010] FIG. 1 is a perspective view of a fish cage water purification system 100 according to an embodiment of the present invention. The fish cage water purification system 100 is a system that absorbs water from a fish cage 200 (which in this embodiment refers to a fish cage used on land), purifies the water outside the fish cage 200, and returns the water to the fish cage 200. The fish cage water purification system 100 is attached to the fish cage 200. Note that the fish cage 200 referred to here may be one for temporarily raising fish or one for long-term raising fish for aquaculture. The fish cage 200 may also be an aquaculture tank or a pond. In this embodiment, polystyrene foam or the like is used as the material for the fish cage 200.

[0011] As shown in FIG. 1 , the fish cage water purification system 100 includes a water passing container 120, an extrusion pump 126 and a suction pump 127 that move water in the water passing container 120, a physical filtration filter 130 that is detachably mounted in the water passing container 120, and a bacteria-carrying filter 140 that is detachably mounted in the water passing container 120.

[0012] The water passing container 120 is a container through which water absorbed from the fish pen 200 can pass. The water passing container 120 has a container body 120a with a U-shaped cross section that is open at the top. The container body 120a has a water inlet (not shown) on the upstream side and a water outlet (not shown) on the downstream side. The water passing container 120 is configured to accommodate six cassettes lined up horizontally from upstream to downstream. These six cassettes include two types of cassettes, three of each. One cassette of each type is represented by the reference numerals 121a and 121b. The water passing container 120 is made of a material such as transparent polyvinyl chloride.

[0013] Three cassettes 121a (first cassettes) containing physical filters 130 are arranged horizontally side by side on the upstream side. Furthermore, three cassettes 121b (second cassettes) containing bacteria-carrying filters 140 are arranged horizontally side by side downstream of the cassettes 121a (first cassettes). The water passing container 120 has six frames 120b. A cassette 121a or 121b is positioned in each frame 120b. The water passing container 120 also has six lids 120c. The interior is closed by placing each lid 120c over the frame 120b.

[0014] The cassettes 121a and 121b are U-shaped containers with an open top and a mesh-like bottom and sides. Each of the meshes is formed to allow water to pass through and is smaller than the physical filter 130 and the bacteria-carrying filter 140. The physical filter 130 and the bacteria-carrying filter 140 are housed in the cassettes 121a and 121b, respectively. Maintenance can be easily performed by replacing the physical filter 130 and the bacteria-carrying filter 140 together with the cassette 121a or 121b.

[0015] Furthermore, for example, when replacing three cassettes 121a containing physical filters 130, one can be left in the water passing container 120 while the other two can be removed and replaced from the water passing container 120, allowing the physical filtration process to be maintained by the physical filter 130 in the remaining cassette 121a. Similarly, when replacing three cassettes 121b containing bacteria-carrying filters 140, one can be left in the water passing container 120 while the other two can be removed and replaced from the water passing container 120, allowing the bacteria-carrying and biological filtration processes to be maintained by the bacteria-carrying filter 140 in the remaining cassette 121b.

[0016] The push pump 126 is a pump located on the inlet side of the water passing container 120 that pushes water from the upstream side to the downstream side. The draw pump 127 is a pump located on the outlet side of the water passing container 120 that draws water from the downstream side to the upstream side. The push pump 126 and the draw pump 127 adjust the pressure difference between the inlet and outlet sides of the water passing container 120 to be equal, allowing water to flow smoothly. If the pressures on the inlet and outlet sides of the water passing container 120 were different, water would not flow smoothly.

[0017] The physical filter 130 is a filter that is detachably attached (housed) in the water passing container 120. The physical filter 130 traps fish food and excrement from the water absorbed from the fish cage 200 and physically filters it.

[0018] Figure 2 is a photograph of the physical filter 130 used in the fish tank water purification system 100 of Figure 1. As shown in Figure 2, the physical filter 130 is formed by integrating a large number of curved or bent bristles made of a material such as plastic. The physical filter 130 is formed in a mat shape. Use of such a physical filter 130 allows for easier maintenance than conventional physical filtration configurations that use coral or other filtering materials.

[0019] In this embodiment, as shown in FIG. 1 , the physical filter 130 is formed independently of one another and is composed of multiple physical filters 130a-130f housed in a single cassette 121a. Each of the physical filters 130a-130f is arranged with one wide surface facing upstream and the other wide surface facing downstream. In this embodiment, six physical filters 130 are housed, but other numbers may be used. In this embodiment, coarse-mesh physical filters are used as the physical filters 130a-130e, and fine-mesh physical filter 130f is used. The arrangement of the coarse-mesh and fine-mesh physical filters may be changed as appropriate by the user.

[0020] In addition, since the upstream physical filter traps (removes) fish food and droppings more quickly, and the downstream physical filter traps (removes) fish food and droppings more slowly, when washing the physical filter 130, it may be necessary to wash only the upstream physical filter.

[0021] Three cassettes 121a containing multiple physical filtration filters 130 are arranged horizontally side by side on the upstream side of the water passage container 120. The spacing between the bristles of the physical filtration filters 130 may be changed depending on the size of the fish. For example, a physical filtration filter with wide bristles and a coarse mesh may be used for larger fish, while a physical filtration filter with narrow bristles and a fine mesh may be used for smaller fish. Alternatively, a coarse mesh may be used as the upstream physical filtration filter, and a fine mesh may be used as the downstream physical filtration filter.

[0022] The bacteria-holding filter 140 is detachably mounted (housed) in the water passage container 120 as shown in FIG. 1, and filters the water while holding the bacteria contained in the water filtered by the physical filter 130.

[0023] Figure 3(a) is a photograph of the bacteria-carrying filter 140 used in the fish tank water purification system 100 of Figure 1. As shown in Figure 3(a), the bacteria-carrying filter 140 has bacteria-carrying filter pieces 141 and a net 142. The net 142 is a bag-shaped net and stores a plurality of bacteria-carrying filter pieces 141.

[0024] Fig. 3(b) is a photograph of a bacteria-holding filter piece 141 included in the bacteria-holding filter 140 of Fig. 3(a). Fig. 3(c) is a photograph of a state in which a plurality of bacteria-holding filter pieces 141 of Fig. 3(b) are assembled together. As shown in Fig. 3(b), the bacteria-holding filter piece 141 is formed from continuous foam. The bacteria-holding filter piece 141 has a plurality of holes that allow water to pass through and is made of an expandable material. In this embodiment, the bacteria-holding filter piece 141 is made in the form of a cube (regular hexahedron), but may be made in the form of another polyhedron.

[0025] The bacteria-carrying filter pieces 141 of the bacteria-carrying filter 140 contain neither aerobic nor anaerobic bacteria before the water from the fish preserve 200 passes through. However, because the bacteria-carrying filter pieces 141 are made of continuous foam, they have a filtering function when the water from the fish preserve 200 passes through. Therefore, the bacteria-carrying filter pieces 141 can trap and filter out substances that the physical filter 130 was unable to remove.

[0026] A plurality of bacteria-carrying filter pieces 141 as shown in Fig. 3(c) are packed into a net 142 (such as a laundry net) as shown in Fig. 3(a). This net 142 has a plurality of holes, each of which is smaller than the size of a bacteria-carrying filter piece 141.

[0027] Such a bacteria-holding filter 140 is housed in one cassette 121b shown in Figure 1. Three cassettes 121b containing such bacteria-holding filters 140 are arranged horizontally side by side on the downstream side of the water passing container 120. Note that in this embodiment, one bacteria-holding filter 140 is housed in one cassette 121b, but a configuration in which multiple bacteria-holding filters 140 are housed in one cassette 121b may also be used.

[0028] Here, we will explain why the bacteria-carrying filter 140 retains bacteria as the water from the fish preserve 200 passes through it. Bacteria that normally reside on fish are attached to the gills of the fish, for example. As the water from the fish preserve 200 passes through the bacteria-carrying filter 140, the bacteria that normally reside on the fish are absorbed into the bacteria-carrying filter 140 over time, and aerobic or anaerobic bacteria grow. In areas of the fish preserve 200 where the water flow is good, oxygen can be easily absorbed, so aerobic bacteria form. In areas of the fish preserve 200 where the water flow is poor, oxygen cannot be easily absorbed, so anaerobic bacteria form.

[0029] Aerobic bacteria are bacteria that cannot exist without oxygen, and include nitrite and nitrate bacteria such as Nitrosomonas, Nitrosococcus, and Nitrosospira. These aerobic bacteria produce ammonia (NH ３ Nitrite NO ２ Nitrite NO ２ acts on hemoglobin in the blood, preventing it from carrying oxygen, causing oxygen deficiency. ２ Nitrate NO ３ Change to nitrate NO ３ This limits aerobic bacterial decomposition, and there are concerns about overgrowth and its impact on living organisms.

[0030] Anaerobic bacteria are bacteria that do not require oxygen, such as denitrifying bacteria such as Chaudomonas, Denitrifincus, and Paracoccus. These anaerobic bacteria produce nitrates (NO). ３ Nitrogen N ２ Change it to.

[0031] The fish cage water purification system 100 also includes a bacteriostatic device 150. The bacteriostatic device 150 is a device that is installed outside the water passing vessel 120 and sprays millimeter or micron ozone bubbles into the water that has passed through the water passing vessel 120 to inhibit the bacteria and reduce the number of bacteria, and then returns the water to the fish cage 200. The term "bacteriostatic" here means to control the bacteria to reduce the number of bacteria. By inhibiting the bacteria, ammonia NH ３ Nitrite NO ２ and nitrate NO ３ without changing to nitrogen N ２ That is, ammonia reacts with ozone gas to form 2NH ３ +30 ３ = N ２ +30 ２ +3H ２ Nitrogen is generated, such that the amount of nitrogen becomes 0. Furthermore, the bacteria-controlling effect reduces aerobic bacteria, anaerobic bacteria, and other bacteria that have passed through the bacteria-carrying filter 140.

[0032] It should be noted that viruses can also be suppressed by this bacteriostatic device 150. Furthermore, carbon contained in proteins (organic substances) reacts with ozone gas to form the following: 3C + 2O ３ = 3CO ２ +O ２ ...(2) Carbon monoxide and oxygen are generated in this way.

[0033] The bacteriostatic device 150 includes a first ozone generator 151 that generates ozone gas and a first bubble discharger 152 (aeration pump) that converts the ozone gas generated by the first ozone generator 151 into millimeter- or micron-sized bubbles in water. The first ozone generator 151 is a special ozone generator that is turned on and off to adjust the amount of ozone introduced into the fish pen 200. This is because the amount varies depending on the species and size of the fish present therein. The first ozone generator 151 creates a bacteria-suppressing environment in the fish pen with an ozone water concentration of 0.01 mg / L to 0.02 mg / L. The first bubble discharger 152 mixes the ozone gas generated by the first ozone generator 151 with water (filtered water) that has passed through the bacteria-carrying filter 140 and discharges the resulting mixture in a bubbled state into the fish pen 200. These ozone bubbles decompose organic matter and ammonia, significantly reducing suspended solids and dissolved organic matter in the fertilizer water (including pigments). In addition, direct decomposition reduces nitrification and the load of bacterial nitrification and denitrification.

[0034] The fish cage water purification system 100 also includes a reset device 160. The reset device 160 is connected to a path separate from the bacteriostatic device 150, and sterilizes the water that has passed through the water passage container 120, resetting it to a bacteria-free state before returning it to the fish cage 200. The reset device 160 can also suppress viruses. Water contamination cannot be eliminated by bacterial decomposition alone, and the water will become cloudy, so the reset device 160 technology exists as a countermeasure to this, and keeps polluted or colored water clear.

[0035] The reset device 160 includes a second ozone generator 161 that generates ozone gas, a second bubble discharge device 162 (aeration pump) that converts the ozone gas generated by the second ozone generator 161 into millimeter- or micron-sized bubbles in water, and a water storage tank 163 that stores a predetermined amount of nurturing water in the fish pen 200, receives the bubbles generated by the second bubble discharge device 162, and self-circulates them with the water storage tank 163, thereby resetting the contaminated nurturing water and returning it to the fish pen 200.

[0036] The second ozone generator 161 is configured to generate ozone gas with a concentration of, for example, 300 mg / m ３ ]. Unlike the first ozone generator 151, the second ozone generator 161 does not coexist with living organisms, so pure oxygen may be supplied. However, this is merely a guideline, and the reset conditions vary depending on factors such as the level of contamination in the culture water. The second bubble discharger 162 dissolves and mixes the ozone gas generated by the second ozone generator 161 with water (filtered water) that has passed through the bacteria-carrying filter 140, and discharges the resulting mixture into the water storage tank 163. The second bubble discharger 162 discharges ozone water with an ozone water concentration of, for example, 0.1 mg / L or higher. Preferably, the second bubble discharger 162 discharges ozone water with an ozone water concentration of, for example, 0.1 mg / L to 0.5 mg / L. These ozone bubbles decompose organic matter and ammonia, decomposing dissolved organic matter and killing bacteria (bacteria groups) that are harmful to living organisms. This reclaimed water can be reused for aquaculture without being discarded.

[0037] The reset device 160 may be configured to have two water storage tanks 163. For example, the reset device 160 has a first water storage tank (reset water) and a second water storage tank (water before reset => wastewater from the fish pen 200). With this configuration, the reset water in the first water storage tank is poured into the fish pen 200, while the nurturing water (contaminated water) from the fish pen 200 is stored in the second water storage tank. Then, once the contaminated water has accumulated in the second water storage tank, the reset operation is started. Next, the process is reversed, where the reset water in the second water storage tank is poured into the fish pen 200, while the nurturing water (contaminated water) before reset from the fish pen 200 is stored in the first water storage tank.

[0038] The reset device 160 is set to reset a portion of the fish pen 200 (for example, about one-third of the water in the fish pen 200) each time it is reset. If the percentage reset in one reset is too high, the fish will be suddenly forced to change their familiar water, which may cause stress and have a negative impact on the fish. The reset device 160 is also set to have a shorter operating time than the bacteriostatic device 150. For example, the bacteriostatic device 150 may be operated constantly, and the reset device 160 may be operated for a specific period of time at predetermined intervals. This operation can be adjusted depending on the capacity of the fish pen 200, the species and size of the fish, and the number of living organisms.

[0039] The system includes a first pipe 171 that allows water to flow from the water storage tank 163 to the second bubble discharge device 162, and a second pipe 172 that allows water to flow from the second bubble discharge device 162 to the water storage tank 163. By moving water through the first pipe 171 and the second pipe 172, the water is circulated between the water storage tank 163 and the second bubble discharge device 162.

[0040] The fish tank water purification system 100 includes a control unit 180. The control unit 180 controls the operation of the bacteriostatic device 150. The control unit 180 also controls the operation of the reset device 160 so as to generate ozone water with a higher concentration than the concentration of ozone water generated by the bacteriostatic device 150. However, automatic control may not be necessary depending on the situation, and this function can also be operated manually.

[0041] Figure 4 is a conceptual diagram of the fish pen water purification system 100 of Figure 1. The fish pen water purification system 100 also includes pipes 201-205, pipes 301 and 302, motor-operated valves 311-319, and a pump 323. Pipe 201 connects the fish pen 200 to the upstream end of the water passage container 120. Pipe 202 extends from the downstream end of the water passage container 120 to branch point S1. Pipe 203 branches off from branch point S1 of pipe 202 and is connected to the fish pen 200. Pipe 204 branches off from branch point S2 of pipe 203 and is connected to the first bubble discharge device 152. Pipe 205 flows from the first bubble discharge device 152 and merges with pipe 203 at merge point S3.

[0042] The pipe 301 extends from the branch point S1 to the water storage tank 163. The pipe 302 connects the fish cage 200 to a branch point S4 where the pipe branches off downstream of the second bubble discharge device 162.

[0043] Electric valves 311 and 312 are provided on pipe 201. Electric valve 313 is provided on pipe 202. Electric valve 314 is provided on pipe 203. Electric valve 315 is provided on pipe 301. Electric valve 316 is provided on first pipe 171. Electric valve 317 is provided on pipe 302. Electric valve 318 is provided on second pipe 172. Electric valve 319 is a valve for releasing air.

[0044] Next, the operation of the fish cage water purification system 100 will be described with reference to Fig. 4. When the user sets the fish cage water purification system 100 for normal operation, the control unit 180 opens the motorized valves 311, 312, 313, and 314, closes the motorized valve 315, and drives the push pump 126 and the draw pump 127.

[0045] Water from the fish pen 200 flows through pipe 201 into the water passing container 120. The water passes through a physical filter 130 in the water passing container 120. Fish food and feces contained in the water are removed by the physical filter 130. After filtering, the water passes through a bacteria-carrying filter 140. Fish bacteria contained in the water are filtered while being carried by the bacteria-carrying filter 140. The water that has passed through the bacteria-carrying filter 140 is returned to the fish pen 200 through pipes 202 and 203.

[0046] When the water in the fish cage 200 becomes cloudy, the control unit 180 drives the bacteriostatic device 150 in response to a user operation. A portion of the water that has passed through the bacteria-carrying filter 140 described above is passed through pipe 204, which branches off from branch point S2 midway through pipe 203, and purified by the bacteriostatic device 150 using millimeter- or micron-sized ozone bubbles. The water passes through pipe 205 and joins pipe 203 at junction S3, before being returned to the fish cage 200. The millimeter- or micron-sized ozone bubbles spread far within the fish cage 200 and burst, purifying the water even within the fish cage 200. The millimeter- or micron-sized ozone bubbles tend to spread far without bursting.

[0047] If the water in the fish tank 200 becomes cloudy even after the antibacterial device 150 has been used to inhibit bacteria, the user can set the fish tank water purification system 100 to perform a reset operation, and the control unit 180 will close the electric valve 314, open the electric valves 315, 316, and 318, and control the operation of the reset device 160.

[0048] The water that has passed through the bacteria-carrying filter 140 passes through pipe 301 and reaches the water storage tank 163 where it is stored. The stored water then passes through first pipe 171 and is purified by the second bubble discharge device 162 using millimeter- or micron-sized ozone bubbles, and is returned to the water storage tank 163 through second pipe 172. The water then circulates by passing through the water storage tank 163, first pipe 171, second bubble discharge device 162, and second pipe 172 multiple times.

[0049] Then, after a predetermined time has elapsed, the control unit 180 closes the electric valve 318 and opens the electric valve 317 .

[0050] The purified water stored in the water storage tank 163 has a reduced ozone water concentration and is returned to the fish cage 200 through the second bubble discharge device 162 and the pipe 302.

[0051] Table 1 shows the dissolved oxygen value [mg / L], ammonium ion concentration [mg / L], and ozone water concentration [mg / L] in the water storage tank 163 before the start of resetting, 30 minutes after the end of resetting, and after stirring for 1 hour after the end of resetting when the reset device 160 is used to reset the water in the water storage tank 163.

[0052]

[0053] As shown in Table 1, 30 minutes after the start of the reset, the dissolved oxygen level in the water storage tank 163 increases from 5.52 mg / L to 6.49 mg / L, and the ozone water concentration increases from 0.05 mg / L to 0.21 mg / L. Furthermore, due to the influence of ozone bubbles, ammonium ions decrease from 0.08 mg / L to 0 mg / L. This completes the direct decomposition of ammonia to nitrogen.

[0054] It is safer for the fish when the ozone water concentration in the water storage tank 163 drops below 0.21 mg / L, for example to about 0.1 mg / L, when the ozone water is returned to the fish preserve 200. When live fish are transported, there is a possibility that the organic matter has not yet been converted into ammonia, but the ammonia is neutralized in about 30 minutes.

[0055] For this reason, as shown in Table 1, if the generation of ozone by the second ozone generator 161 is stopped and the water in the water storage tank 163 is stirred for one hour with a pump-discharge fluid (e.g., air) from the second bubble discharge device 162 to remove the ozone gas, the dissolved concentration value drops from 6.49 mg / L to 5.57 mg / L, and the ozone water concentration drops from 0.21 mg / L to 0.10 mg / L. If the ozone water concentration is 0.10 mg / L, the ozone water concentration will be further diluted when returned to the fish preserve 200, making it safe for fish. It is also possible to wait for the ozone to naturally escape without using a discharge fluid, and for the ozone water concentration to drop to 0.10 mg / L.

[0056] During the operation of the above-described fish cage water purification system 100, the bacteria carried on the bacteria-carrying filter 140 become aerobic bacteria and nitrify (produce ammonia NH ３ → nitrite NO ２ → Nitrate NO ３ ), and denitrification occurs as anaerobic bacteria (nitrate NO ３ → Nitrogen N ２ The bacteria-holding filter 140 has a structure that allows both aerobic and anaerobic conditions to coexist.

[0057] Next, a method for a user to perform maintenance on the fish tank water purification system 100 will be described. A user can restore the water purification performance of the physical filter 130 by removing the physical filter 130 from the cassette 121a, washing it, and then returning it to the cassette 121a. A user can also restore the water purification performance of the bacteria-holding filter 140 by removing the bacteria-holding filter 140 from the cassette 121b, washing it, and then returning it to the cassette 121b.

[0058] According to the configuration of the above-described embodiment, the physical filter 130 removes fish food and feces from the fish in the fish tank 200, the bacteria-carrying filter 140 carries bacteria detached from the fish in the fish tank 200 and performs nitrification and denitrification after the water in the fish tank 200 passes through, and the bacteriostatic device 150 reduces bacteria that were not completely removed by the bacteria-carrying filter 140. Since the cassette 121a containing the physical filter 130 and the cassette 121b containing the bacteria-carrying filter 140 are detachably attached to the water passing container 120, a user can replace the cassettes 121a and 121b if the functions of the physical filter 130 and the bacteria-carrying filter 140 deteriorate over time. As a result, the filtering functions of the physical filter 130 and the bacteria-carrying filter 140 can be maintained at a high level with simple maintenance, thereby providing a fish tank water purification system that can continuously purify the water in the fish tank 200 without replacing it.

[0059] Furthermore, the physical filter 130 and the bacteria-carrying filter 140 are arranged side by side horizontally. Therefore, when it is desired to replace the physical filter 130 or the bacteria-carrying filter 140, the physical filter 130 or the bacteria-carrying filter 140 can be easily removed and another physical filter 130 or a bacteria-carrying filter 140 can be easily installed. If a system is constructed with the fish cage 200, the bacteria-carrying filter 140, and the physical filter 130 arranged in that order from the bottom, it is difficult to replace the bacteria-carrying filter 140 with another bacteria-carrying filter 140 because the physical filter 130 is placed on top.

[0060] Furthermore, because the physical filtration filter 130 and the bacteria-carrying filter 140 are arranged side by side horizontally, there is no need to build scaffolding around the fish pen 200 for replacing the bacteria-carrying filter 140 and the physical filtration filter 130. If a system is constructed with the fish pen 200, bacteria-carrying filter 140, and physical filtration filter 130 in that order from the bottom, it will be necessary to build scaffolding around the fish pen 200 for replacing the bacteria-carrying filter 140 and the physical filtration filter 130.

[0061] Furthermore, the bacteria-carrying filter 140 does not contain aerobic or anaerobic bacteria before the water from the fish preserve 200 passes through it. The basic concept is to amplify bacteria generated by the environment in which it is installed and the fish introduced into the filter. This is because the bacteria-carrying filter 140 carries aerobic and anaerobic bacteria after water purification begins, cultivating the aerobic and anaerobic bacteria generated by the water from the fish preserve 200, without the need for external bacteria. Furthermore, commercially available aerobic and anaerobic bacteria are invasive species and do not multiply. Therefore, they must be purchased and continuously added as needed. This reduces running costs compared to configurations that require the addition of aerobic and anaerobic bacteria before water purification.

[0062] Furthermore, the bacteriostatic device 150 includes a first ozone generator 151 and a first bubble discharge device 152 that converts the ozone gas generated by the first ozone generator 151 into millimeter- or micron-sized bubbles in water, so that the ozone gas in the bubble state can easily reach every corner of the fish preserve 200. If the bubbles are too large, the fish in the fish preserve 200 may die, and if the bubbles are too small, the ozone gas cannot travel far within the fish preserve 200.

[0063] The reset device 160 has a second ozone generator 161, a second bubble discharge device 162 that converts the ozone gas generated by the second ozone generator 161 into millimeter- or micron-sized bubbles in water, and a water storage tank 163 that stores a predetermined amount of water that has passed through the bacteria-carrying filter 140, receives the bubbles generated by the second bubble discharge device 162, and returns the water to the fish pen 200. Therefore, by sterilizing the water of the fish pen 200 stored in the water storage tank 163, bacteria can be reduced more reliably than by the bacteriostatic device 150.

[0064] The fish cage water purification system 100 is configured so that water moves through the first pipe 171 and the second pipe 172, circulating water between the water storage tank 163 and the second bubble discharge device 162. With this configuration, bacteria can be reduced more evenly than with the bacteriostatic device 150.

[0065] While the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to these examples. It is clear that those skilled in the art can conceive of various modifications and alterations within the scope of the claims, and it is understood that these modifications and alterations also fall within the technical scope of the present invention.

[0066] Furthermore, the present invention can be practiced by freely combining inventions described in claims and examples, regardless of the dependent relationships of the claims.

[0067] The present invention can be used in a fish cage water purification system.

[0068] 100... fish tank water purification system, 120... water passage container, 120a... container body, 120b... frame, 120c... lid, 121a, 121b... cassette, 126... extrusion pump, 127... drawing pump, 130... physical filtration filter, 130a to 130f... physical filtration filter, 140... bacteria-carrying filter, 141... bacteria-carrying filter piece, 142... net, 150... Bacteriostatic device, 151...first ozone generator, 152...first bubble discharge device, 160...reset device, 161...second ozone generator, 162...second bubble discharge device, 163...water storage tank, 171...first pipe, 172...second pipe, 180...control unit, 200...fish cage, 201-205...pipes, 301-302...pipes, 311-318...electric valves, 323...pump, S1-S4...branch points

Claims

1. A bamboo mat water purification system that purifies water absorbed from a bamboo mat outside the bamboo mat and returns it to the bamboo mat. The bamboo mat water purification system includes: A water passage container through which water absorbed from the bamboo mat can pass; First and second cassettes detachably mounted in the water passage container and through which water can pass; A physical filtration filter housed in the first cassette for physically filtering the water absorbed from the bamboo mat; A bacteria-carrying filter housed in the second cassette for filtering water while carrying bacteria contained in the water filtered by the physical filtration filter; A bactericidal device for spraying ozone bubbles of millimeters or microns into the water passing through the water passage container to reduce bacteria and returning the water to the bamboo mat; A control unit for controlling the drive of the bactericidal device. A bamboo mat water purification system characterized by comprising the above.

2. The physical filtration filter and the bacteria-carrying filter are arranged side by side in the horizontal direction. The bamboo mat water purification system further includes: An extrusion pump arranged on the inlet side of the water passage container for extruding water from the upstream side to the downstream side; A suction pump arranged on the outlet side of the water passage container for sucking water from the downstream side to the upstream side. The bamboo mat water purification system according to claim 1, characterized by comprising the above.

3. The bacteria-carrying filter does not contain aerobic bacteria and anaerobic bacteria in the state before the water of the bamboo mat passes through. The bamboo mat water purification system according to claim 1 or 2, characterized by the above.

4. The bactericidal device includes: A first ozone generator for generating ozone gas; A first bubble discharge device for discharging the ozone gas generated by the first ozone generator as bubbles of millimeters or microns in size in water to decompose ammonia in the water into nitrogen. The bamboo mat water purification system according to claim 1 or 2, characterized by comprising the above.

5. The raw sewage purification system further includes a reset device that returns the water passing through the water passage container to a bacteria-free reset state and returns it to the raw sewage. The reset device is controlled by the control unit and includes a second ozone generator that generates ozone gas, a second bubble discharge device that discharges the ozone gas generated by the second ozone generator as bubbles having a size of millimeters or microns in water to decompose ammonia in the water into nitrogen, and a water storage tank that stores a predetermined amount of water passing through the water passage container, receives the bubbles discharged by the second bubble discharge device, and returns it to the raw sewage. The control unit controls the driving of the reset device so as to generate an ozone water concentration higher than the ozone water concentration generated by the bactericidal device. The raw sewage purification system according to claim 4, characterized in that.

6. The raw sewage purification system further includes a first pipe that flows water from the water storage tank to the second bubble discharge device, and a second pipe that flows water from the second bubble discharge device to the water storage tank. The raw sewage purification system according to claim 5, characterized in that water is circulated between the water storage tank and the second bubble discharge device by moving water in the first pipe and the second pipe.

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