Aquaponics system

Abstract

To provide an aquaponics system that enables appropriate management of rearing water components while reducing costs.SOLUTION: A filtration tank 30 is disposed at a position lower than a rearing tank 10 and a cultivation tank 20, and includes a first chamber R1 that allows rearing water discharged from the rearing tank 10 to pass through a filtration medium 32 to filter the rearing water, and also nitrifies ammonia contained in the rearing water, and a third chamber R3 that allows adjustment of the components of the rearing water having passed through the filtration medium 32. A circulation path 70 includes: a first path 71 that causes the rearing water discharged from the rearing tank 10 to flow into the first chamber R1 by means of the height difference between the rearing tank 10 and the filtration tank 30; and a second path 72 that causes the rearing water in the third chamber R3 to flow into the cultivation tank 20 and the rearing tank 10 by means of the power of a pump 40.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an aquaponics system technology that combines fish farming and plant cultivation. [Background technology]

[0002] Conventionally, aquaponics system technology that combines fish farming and plant cultivation has been publicly known, as described in Patent Document 1, for example.

[0003] The aquaponics system described in Patent Document 1 includes a breeding tank for raising fish, a plant container for cultivating plants, and a pump for sending raw water from the breeding tank to the plant container. The raw water sent from the breeding tank to the plant container by the pump is purified by a filter bed installed in the plant container. This breaks down fish waste and the like, and treated water containing plant nutrients is generated in the plant container. In the aquaponics system, the nutrients are absorbed by the plants, and the treated water is returned to the breeding tank, allowing fish to be cultivated and plants to be grown simultaneously.

[0004] However, in the aquaponics system, a filter bed for purifying the raw water (breeding water) must be provided in each of the multiple breeding tanks, which may lead to increased costs. In addition, if the breeding water is continuously circulated, it becomes necessary to adjust the composition of the breeding water. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 6548220 Summary of the Invention [Problem to be solved by the invention]

[0006] The present invention has been made in consideration of the above-mentioned circumstances, and the problem it aims to solve is to provide an aquaponics system that can appropriately manage the components of the breeding water while reducing costs. [Means for solving the problem]

[0007] The problem to be solved by the present invention has been described above, and the means for solving this problem will now be described.

[0008] That is, in claim 1, the invention comprises an aquaculture tank for storing breeding water in which fish are raised, a filtration tank for filtering the breeding water discharged from the aquaculture tank, a cultivation tank for cultivating plants using the breeding water filtered by the filtration tank, and a circulation path for circulating the breeding water between the aquaculture tank, the filtration tank, and the cultivation tank, the filtration tank being positioned lower than the aquaculture tank and the cultivation tank, and comprising a filtration chamber for passing the breeding water discharged from the aquaculture tank through a first filter material, and an adjustment chamber capable of adjusting the components of the breeding water that has passed through the first filter material, and the circulation path includes a first path for circulating the breeding water discharged from the aquaculture tank to the filtration chamber due to the height difference between the aquaculture tank and the filtration tank, and a second path for circulating the breeding water in the adjustment chamber to the cultivation tank and the aquaculture tank by the power of a pump.

[0009] In claim 2, the filtration tank includes a backflow prevention chamber that prevents the breeding water in the adjustment chamber from flowing back into the filtration chamber.

[0010] In claim 3, the filtration tank comprises a first partition separating the filtration chamber and the backflow prevention chamber, and a second partition separating the backflow prevention chamber and the adjustment chamber, the first partition having a first opening formed at the bottom connecting the filtration chamber and the backflow prevention chamber, the filtration chamber is supplied with the rearing water discharged from the aquaculture tank from above, and the first filter material is arranged to block the first opening, and the second partition has a second opening formed at the top connecting the backflow prevention chamber and the adjustment chamber.

[0011] In claim 4, the system includes a component sensor capable of detecting the amount of a target component among the components of the breeding water in the adjustment chamber, a component adding device capable of adding the target component to the breeding water in the adjustment chamber, and a control unit capable of controlling the component adding device, and the control unit controls the operation of the component adding device to add the target component to the breeding water in the adjustment chamber when the amount of the target component in the breeding water in the adjustment chamber falls below a predetermined threshold based on the detection result of the component sensor.

[0012] In claim 5, the second path branches off so as to be able to supply the rearing water in the adjustment chamber to each of the aquaculture tank and the cultivation tank, and the circulation path includes a third path which circulates the rearing water discharged from the cultivation tank to the adjustment chamber due to the difference in elevation between the cultivation tank and the filtration tank.

[0013] In claim 6, the cultivation tank is positioned at a higher position than the aquaculture tank, and the second path includes a fourth path that circulates the breeding water in the adjustment chamber to the cultivation tank by the power of the pump, and a fifth path that circulates the breeding water discharged from the cultivation tank to the aquaculture tank by the elevation difference between the cultivation tank and the aquaculture tank.

[0014] In claim 7, a third partition is provided that divides the adjustment chamber into a first adjustment chamber to which the rearing water is supplied from the backflow prevention chamber, and a second adjustment chamber to which the rearing water is circulated to the second path, and the third partition has a third opening formed in the lower part that connects the first adjustment chamber with the second adjustment chamber, and the first adjustment chamber is supplied with the rearing water discharged from the backflow prevention chamber from above, and a second filter material is arranged to block the third opening.

[0015] In claim 8, the first filter medium converts ammonia nitrogen contained in the breeding water into nitrite nitrogen, and the second filter medium converts nitrite nitrogen contained in the breeding water into nitric acid. Effect of the Invention

[0016] The present invention has the following advantages.

[0017] In the present invention, the components of the rearing water can be appropriately managed while reducing costs. [Brief description of the drawings]

[0018] [Figure 1] FIG. 1 is a schematic diagram showing an aquaponics system according to a first embodiment of the present invention. [Diagram 2] Schematic diagram showing the configuration of the aquaculture tank. [Diagram 3] FIG. 2 is a schematic diagram showing a cultivation tank and a pump. [Figure 4] FIG. 3 is a schematic diagram showing a filtration tank, a water supply section, and an ingredient adding device. [Diagram 5] FIG. 4 is a schematic diagram showing a filtration tank, a water supply unit, and an ingredient adding device according to another embodiment. [Figure 6] FIG. 1 is a schematic diagram showing an aquaponics system (filtration tank) according to a second embodiment of the present invention. [Figure 7] FIG. 1 is a schematic diagram showing an aquaponics system according to a third embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] Hereinafter, an aquaponics system (hereinafter simply referred to as "system") 1 according to a first embodiment of the present invention will be described.

[0020] When cultivating fish, ammonia nitrogen derived from fish waste and residual feed is harmful to fish, so the ammonia nitrogen contained in the breeding water must be nitrified into nitric acid, for example, by the action of microorganisms. Nitrate can also be used as a nutrient for plants. System 1 focuses on this point and circulates breeding water between aquaculture (fish farming) and hydroponic cultivation (plant cultivation), performing both simultaneously.

[0021] As shown in FIG. 1, the system 1 includes an aquaculture tank 10, a cultivation tank 20, a filtration tank 30, a pump 40, a water supply device 50, an ingredient adding device 60, and a circulation path 70.

[0022] The aquaculture tank 10 shown in Fig. 1 and Fig. 2 is for cultivating fish. In this embodiment, the fish are assumed to be saltwater fish. The aquaculture tank 10 receives fish breeding water from a filtration tank 30 (described later) and returns the breeding water to the filtration tank 30. The aquaculture tank 10 includes a culture tub section 11, a culture leg section 12, and an aquaculture drainage section 13.

[0023] The culture tub section 11 is a container in which breeding water is stored and fish are raised (cultured). In this embodiment, since saltwater fish are raised, the breeding water has a predetermined salinity. The breeding water also contains various mineral components such as sodium, calcium, and potassium. The culture tub section 11 is formed in the shape of a tub that is open upward, with a bottom 11a that is roughly rectangular in plan view (not shown) and sidewalls 11b that stand upright from the outer edge of the bottom 11a.

[0024] The culture legs 12 form the legs of the culture tank 10. The culture legs 12 are formed in a roughly rod-like shape and extend downward from the four corners of the bottom 11a. The culture legs 12 are installed in a state in which the culture tank 11 is spaced upward from the floor surface FL (with a space provided between the bottom 11a and the floor surface FL).

[0025] The aquaculture drainage section 13 discharges the culture water stored in the culture barrel section 11 to the outside. The aquaculture drainage section 13 is provided in two places in the culture barrel section 11. Specifically, the aquaculture drainage section 13 is provided in each of the side wall section 11b and the bottom section 11a of the culture barrel section 11. Hereinafter, the aquaculture drainage section 13 provided in the side wall section 11b is referred to as the "first aquaculture drainage section 13a," and the aquaculture drainage section 13 provided in the bottom section 11a is referred to as the "second aquaculture drainage section 13b."

[0026] The first aquaculture drainage section 13a is provided on the upper part of the side wall section 11b. When the water level of the culture water stored in the culture tub section 11 reaches the position of the first aquaculture drainage section 13a, the first aquaculture drainage section 13a causes the culture water to overflow and be discharged to the outside of the culture tub section 11.

[0027] The second aquaculture drainage section 13b is provided at approximately the center of the bottom section 11a in a plan view. The second aquaculture drainage section 13b utilizes the principle of an inverted siphon as described below to discharge the culture water stored in the aquaculture tub section 11 to the outside.

[0028] The cultivation tank 20 shown in Figures 1 and 3 is for hydroponically cultivating plants. As the plants, various plants suitable for hydroponics, such as leafy vegetables, herbs, tomatoes, etc., can be adopted. The cultivation tank 20 receives culture water from a filtration tank 30 (described later) and returns the culture water to the filtration tank 30. The cultivation tank 20 includes a cultivation tub section 21, a cultivation leg section 22, a planting panel 23, and a cultivation drainage section 24.

[0029] The cultivation tub portion 21 is a container for storing culture water. The cultivation tub portion 21 is formed in a tub shape that is open upward, by a bottom portion 21a having a generally rectangular shape (not shown) in a plan view and a side wall portion 21b that stands upright from the outer edge of the bottom portion 21a.

[0030] The cultivation legs 22 constitute the legs of the cultivation tank 20. The cultivation legs 22 are formed in a roughly rod-like shape and extend downward from the four corners of the bottom 21a. The cultivation legs 22 are installed in a state in which the cultivation tub portion 21 is spaced upward from the floor surface FL (a state in which a space is provided between the bottom 21a and the floor surface FL).

[0031] The planting panel 23 is a member in which plants are planted. The planting panel 23 is formed in a substantially plate shape and is made of, for example, polystyrene foam. The planting panel 23 is installed on the upper part of the cultivation tub part 21 so as to cover the cultivation tub part 21 from above.

[0032] The cultivation drainage section 24 discharges the culture water stored in the cultivation tub section 21 to the outside. The cultivation drainage section 24 is provided on the side wall section 21b generally below the planting panel 23. When the water level of the culture water stored in the cultivation tub section 21 reaches the position of the cultivation drainage section 24 (more specifically, the upper part of the cultivation drainage section 24), the cultivation drainage section 24 causes the culture water to overflow and be discharged to the outside of the cultivation tub section 21. In this embodiment, the height position of the cultivation drainage section 24 is configured to be the same as the height position of the first culture drainage section 13a of the aquaculture tank 10.

[0033] The filtration tank 30 shown in Figures 1 and 4 is for filtering the rearing water and adjusting the composition of the rearing water. In this embodiment, the filtration includes both physical filtration and biological filtration. As described above, the filtration tank 30 transfers rearing water between the aquaculture tank 10 and the cultivation tank 20. The filtration tank 30 includes a filtration tub section 31, a filter medium 32, a float switch 33, and a water receiving section 34.

[0034] The filtration tub 31 is a container for storing rearing water. The filtration tub 31 is formed in a tub shape that is open upward, with a bottom 31a that is generally rectangular in plan view (not shown) and a side wall 31b that stands upright from the outer edge of the bottom 31a. The cultivation tub 21 is provided with a partition plate 35.

[0035] The partition plate 35 divides (divides) the inside of the filtration tub section 31. The partition plate 35 is formed, for example, in a plate shape, and is provided inside the filtration tub section 31 so as to span from one side wall section 31b to the other side wall section 31b in a plan view. A plurality of partition plates 35 (two in this embodiment) are provided. The two partition plates 35 are provided at positions spaced apart from each other, and divide the inside of the filtration tub section 31 into three chambers.

[0036] In the following, the three chambers are respectively referred to as the "first chamber R1," the "second chamber R2," and the "third chamber R3." In the following, of the two partition plates 35, one partition plate 35 separating the first chamber R1 and the second chamber R2 is referred to as the "first partition plate 36," and the other partition plate 35 separating the second chamber R2 and the third chamber R3 is referred to as the "second partition plate 37."

[0037] Thus, the first chamber R1 and the second chamber R2 are adjacent to each other via the first partition plate 36. Furthermore, the second chamber R2 and the third chamber R3 are adjacent to each other via the second partition plate 37. As a result, the second chamber R2 is disposed between the first chamber R1 and the third chamber R3, and the first chamber R1 and the third chamber R3 are not adjacent to each other via the partition plate 35. In this way, the second chamber R2 prevents rearing water stored in the third chamber R3 from flowing back into the first chamber R1, as described below.

[0038] The filtration tank 30 is disposed at a lower position than the aquaculture tank 10 and the cultivation tank 20. Specifically, the water level of the breeding water stored in the first chamber R1 (height from the floor surface FL) is configured to be lower than the water level of the breeding water stored in the aquaculture tank 10. The water level of the breeding water stored in the third chamber R3 is configured to be lower than the water level of the breeding water stored in the cultivation tank 20. That is, the water level of the breeding water stored in the filtration tank 30 is configured to be the lowest compared to the other two tanks (the aquaculture tank 10 and the cultivation tank 20). In the filtration tank 30, the water level of the third chamber R3 is configured to be lower than the water levels of the first chamber R1 and the second chamber R2. That is, the water level of the third chamber R3 is configured to be the lowest compared to the other two chambers.

[0039] The first partition plate 36 has an opening (first opening 36a) at the bottom. The first opening 36a connects the first chamber R1 and the second chamber R2 to each other. In this embodiment, the first chamber R1 and the second chamber R2 are not connected to each other at any point other than the first opening 36a.

[0040] The second partition plate 37 has an opening (second opening 37a) at the top. The second opening 37a connects the second chamber R2 and the third chamber R3 to each other. In this embodiment, the second chamber R2 and the third chamber R3 are not connected to each other at any point other than the second opening 37a.

[0041] The filter medium 32 filters the breeding water (biological filtration). The filter medium 32 is configured to allow the breeding water to pass through, for example, by a porous member. The filter medium 32 supports a high concentration of predetermined microorganisms. In this way, the filter medium 32 can oxidize ammonia nitrogen in the breeding water passing through the filter medium 32 and change it to nitrite nitrogen, and further oxidize the nitrite nitrogen and change it to nitrate (nitrification).

[0042] The filter medium 32 is formed in a block shape having a predetermined size. The filter medium 32 has a size and shape that is approximately the same as the inside of the first chamber R1 in a plan view. The vertical width (height) of the filter medium 32 is formed to be larger than the vertical width of the first opening 36a. The filter medium 32 is placed on the bottom surface of the first chamber R1. In this way, the filter medium 32 is provided so as to cover the first opening 36a of the first partition plate 36 from the first chamber R1 side.

[0043] The float switch 33 detects the water level in the third chamber R3 of the filtration tub 31. The float switch 33 can detect whether the water level in the third chamber R3 is within a predetermined appropriate water level range. In this embodiment, the appropriate water level range refers to a range of water levels in the third chamber R3 (between the upper limit and lower limit of the appropriate water level) that does not cause water supply trouble, which will be described later. The upper limit of the appropriate water level range is set to be lower than the lower end of the second opening 37a (the upper end of the second partition plate 37 excluding the second opening 37a) indicated by the symbol P in FIG. 4. The detection result of the float switch 33 is transmitted to the water supply device 50, which will be described later.

[0044] The water receiving section 34 is a section that receives the rearing water supplied to the filtration tank 30. The rearing water from the other two tanks (the aquaculture tank 10 and the cultivation tank 20) ​​is supplied (returned) to the water receiving section 34. The water receiving section 34 has a filter 38 for physical filtration. The filter 38 can filter out impurities (e.g. fish waste, food residue, plant roots, etc.) in the rearing water supplied from the other two tanks. The water receiving section 34 is provided at the upper end of the filtration tub section 31. Multiple water receiving sections 34 (two in this embodiment) are provided.

[0045] One of the two water receiving sections 34 (hereinafter referred to as the "first water receiving section 34a") is provided at the upper end of the first chamber R1 of the filtration tub section 31, and receives the culture water from the aquaculture tank 10. In this way, the first water receiving section 34a can supply the culture water from the aquaculture tank 10 to the first chamber R1 after physical filtration by the filter 38. The other of the two water receiving sections 34 (hereinafter referred to as the "second water receiving section 34b") is provided at the upper end of the third chamber R3 of the filtration tub section 31, and receives the culture water from the cultivation tank 20. In this way, the second water receiving section 34b can supply the culture water from the cultivation tank 20 to the third chamber R3 after physical filtration by the filter 38.

[0046] In this manner, in the filtration tank 30, the culture water containing ammonia nitrogen is returned to the first chamber R1 from the aquaculture tank 10. Also, from the cultivation tank 20, the culture water in which the nitrate has been absorbed by the plants and the nitrate concentration has been reduced is returned to the second chamber R2.

[0047] Here, as described above, the first chamber R1 and the second chamber R2 are communicated through the first opening 36a. Therefore, the breeding water stored in the first chamber R1 is supplied from the first chamber R1 to the second chamber R2 through the first opening 36a. At this time, the breeding water supplied from the first chamber R1 to the second chamber R2 is filtered by the filter material 32. As a result, ammonia nitrogen is nitrified in the second chamber R2, and breeding water containing a high concentration of nitric acid is stored. In this embodiment, the first chamber R1 and the second chamber R2 are communicated only through the first opening 36a covered with the filter material 32, so that the breeding water before filtration by the filter material 32 is prevented from being supplied to the second chamber R2, and thus nitrification can be performed efficiently.

[0048] As described above, the second chamber R2 and the third chamber R3 are connected to each other via the second opening 37a. Therefore, when the water level of the culture water stored in the second chamber R2 rises and reaches the lower end of the second opening 37a (see symbol P in FIG. 4), the overflowing culture water passes over the lower end of the second opening 37a and is supplied from the second chamber R2 to the third chamber R3. That is, the culture water containing a high concentration of nitric acid is supplied from the second chamber R2 to the third chamber R3. In this way, in the filtration tank 30, the culture water received by the first water receiving portion 34a from the cultivation tank 20 flows in order from the first chamber R1 to the second chamber R2 and the third chamber R3.

[0049] As described above, the culture water with a reduced nitrate concentration is returned from the cultivation tank 20 to the third chamber R3. Therefore, the culture water from the second chamber R2 and the culture water from the cultivation tank 20 are mixed (i.e., two types of culture water with different nitrate concentrations) are stored in the third chamber R3. In this way, the high concentration of nitrate contained in the culture water from the second chamber R2 is gradually diluted by the low concentration of nitrate contained in the culture water from the cultivation tank 20. That is, the culture water stored in the third chamber R3 has a lower nitrate concentration than the culture water stored in the second chamber R2 and a higher nitrate concentration than the culture water returned from the cultivation tank 20.

[0050] The pump 40 shown in FIG. 1 and FIG. 3 is capable of pumping the rearing water. The pump 40 is provided in the circulation path 70 described later. Specifically, the pump 40 is provided in the second path 72 of the circulation path 70 described later so as to correspond to the third chamber R3 of the filtration tank 30. In this way, the pump 40 can pump the rearing water stored in the third chamber R3 toward a predetermined supply destination. The output of the pump 40 is adjusted so that the water level in the third chamber R3 in the filtration tank 30 is as constant as possible. The output of the pump 40 is adjusted so that the water level in the third chamber R3 in the filtration tank 30 is lower than the water level in the second chamber R2 (i.e., the position of the lower end of the second opening 37a indicated by the symbol P in FIG. 4). This makes it possible to prevent the rearing water stored in the third chamber R3 from excessively increasing in volume due to rearing water from, for example, the cultivation tank 20, and flowing back into the second chamber R2 through the second opening 37a.

[0051] The water supply device 50 shown in Figs. 1 and 4 automatically supplies water. The amount of rearing water circulating in the system 1 gradually decreases due to evaporation and absorption by the plants. If the amount of rearing water decreases excessively, the pump 40 may run idle, causing water supply problems such as breakdowns. In this embodiment, the water supply device 50 automatically supplies water at a predetermined timing, thereby preventing water supply problems. The water supply device 50 includes a water supply path 51 and a water supply tap 52.

[0052] The water supply path 51 is configured with piping or the like, and connects a predetermined water supply source (for example, a water pipe) and the third chamber R3 of the filtration tank 30. The water supply path 51 is configured to be able to circulate water from the water supply source. Furthermore, the water supply valve 52 is provided in the middle of the water supply path 51. The water supply valve 52 is equipped with an on-off valve or the like that can be opened and closed by a predetermined driving force, and is configured to be able to automatically open and close the water supply path 51 in response to the received detection result of the float switch 33 of the filtration tank 30.

[0053] Specifically, the water supply tap 52 is changed from a closed state to an open state when the water level in the third chamber R3 falls below the appropriate water level range. As a result, when the water level in the third chamber R3 falls below the appropriate water level range, water supply to the third chamber R3 is automatically started. Also, the water supply tap 52 is changed from an open state to a closed state when the water level in the third chamber R3 exceeds the appropriate water level range. As a result, for example, when the water level in the third chamber R3 exceeds the appropriate water level range due to water supply from the water supply device 50, water supply to the third chamber R3 is automatically stopped. In this way, for example, it is possible to prevent the water level in the third chamber R3 from excessively rising and rearing water stored in the third chamber R3 from flowing back into the second chamber R2 through the second opening 37a.

[0054] In this way, according to the configuration of the water supply device 50 as described above, the water level of the rearing water stored in the third chamber R3 can be always kept at an appropriate water level, and the occurrence of water supply problems can be suppressed. In addition, since a water level adjustment mechanism is provided for the chamber (third chamber R3) with the lowest water level among the three chambers of the filtration tank 30, the water level in the filtration tank 30 can be efficiently managed.

[0055] 1 and 4, the component adding device 60 adjusts the components in the rearing water. The component adding device 60 is connected to the third chamber R3 of the filtration tank 30 via a predetermined path. In the system 1, water is automatically supplied from the water supply device 50 as described above, and the mineral components in the rearing water are absorbed by the plants as nutrients, so that the abundance ratio of the mineral components contained in the rearing water may change.

[0056] Therefore, the component adding device 60 supplies an arbitrary amount (addition amount) of a target component among various mineral components to the third chamber R3. The component adding device 60 has an input mechanism that allows the target component and the amount to be added to be arbitrarily set, for example, in response to an operation by an administrator. In this way, the abundance ratio of mineral components contained in the breeding water can be changed to an appropriate one by supplying the target component according to the administrator's setting.

[0057] 1 to 3 is for circulating the rearing water between the aquaculture tank 10, the cultivation tank 20, and the filtration tank 30. The circulation path 70 is formed by appropriately combining pipes, joints, etc., and is configured to be able to circulate the rearing water from a predetermined distribution source to a distribution destination. The circulation path 70 includes a first path 71, a second path 72, and a third path 73.

[0058] The first path 71 is provided between the aquaculture tank 10 and the filtration tank 30, and circulates the rearing water stored in the aquaculture tank 10 to the filtration tank 30. The first path 71 includes two types of paths (hereinafter referred to as a "first main path 71a" and a "first sub-path 71b").

[0059] One side (upstream side) end of the first main passage 71a is connected to the first aquaculture discharge section 13a of the aquaculture tank 10. The other side (downstream side) end of the first main passage 71a is connected to the first water receiving section 34a of the filtration tank 30. The first main passage 71a is configured so that its height position generally decreases from the upstream side to the downstream side. As a result, the first main passage 71a can circulate the rearing water that overflows from the first aquaculture discharge section 13a and is discharged outside the aquaculture tub section 11 to the filtration tank 30 by utilizing the height difference between the aquaculture tank 10 and the filtration tank 30.

[0060] One side (upstream side) end of the first sub-path 71b is connected to the second aquaculture drainage section 13b of the aquaculture tank 10. The other side (downstream side) end of the first sub-path 71b is connected to a longitudinal midpoint (between the upstream end and the downstream end) of the first main path 71a. In this way, the first sub-path 71b can use the principle of an inverted siphon to drain the culture water from the bottom of the aquaculture tank 10 and circulate it upward. At this time, dirt accumulated on the bottom of the aquaculture tank 10 can be drained together with the culture water and circulated to the filtration tank 30. The dirt drained from the aquaculture tank 10 is removed from the culture water by the filter 38 of the first water receiving section 34a of the filtration tank 30.

[0061] The second path 72 is provided between the filtration tank 30 and the cultivation tank 20 and the aquaculture tank 10. The second path 72 circulates the rearing water stored in the filtration tank 30 to the cultivation tank 20 or the aquaculture tank 10. One side (upstream side) end of the second path 72 is connected to a drain outlet (not shown) provided at the bottom of the third chamber R3 of the filtration tank 30. The other side (downstream side) end of the second path 72 branches into two, one end of which is connected to the cultivation tank 20 from above, and the other end of which is connected to the aquaculture tank 10 from above.

[0062] In addition, an on-off valve 75 is provided in the second path 72 between the branching portion D and the two downstream end portions. In the following, of the two on-off valves 75, the on-off valve 75 provided between the branching portion D and the cultivation tank 20 may be referred to as the "cultivation-side on-off valve 75a," and the on-off valve 75 provided between the branching portion D and the aquaculture tank 10 may be referred to as the "cultivation-side on-off valve 75b." In addition, a pump 40 is provided in the second path 72 between the branching portion D and the upstream end portion.

[0063] As a result, the second path 72 can allow the rearing water stored in the third chamber R3 of the filtration tank 30 to flow to any of the cultivation tanks 20 and the aquaculture tanks 10 by, for example, an administrator opening any one of the two on-off valves 75 (the cultivation-side on-off valve 75a and the aquaculture-side on-off valve 75b) and closing the other. The two on-off valves 75 may be configured to automatically switch at a predetermined timing (for example, timing based on the detection result of the amount of rearing water in each tank).

[0064] In this way, the culture water stored in the third chamber R3 is supplied to the aquaculture tank 10 and the cultivation tank 20. Here, the culture water stored in the third chamber R3 contains a high concentration of nitric acid due to filtration by the filter medium 32 in the first chamber R1. In other words, the culture water stored in the third chamber R3 is the culture water returned from the cultivation tank 20 to the third chamber R3 (i.e., the culture water in which the nitric acid has been reduced due to absorption by the plants) to which new nitric acid has been added. In this way, in this embodiment, nitric acid, which is a nutrient for plants, can be suitably supplied to the cultivation tank 20, and the growth of the plants can be effectively promoted.

[0065] As described above, the culture water stored in the third chamber R3 has a lower nitrate concentration than the culture water stored in the second chamber R2, and a higher nitrate concentration than the culture water returned from the cultivation tank 20. That is, the culture water stored in the third chamber R3 does not have an excessively high nitrate concentration (it is moderate). Generally speaking, culture water with an excessively high nitrate concentration is not suitable for cultivating fish. In contrast, in this embodiment, the culture water with a moderate nitrate concentration stored in the third chamber R3 can be supplied to the culture tank 10, so that adverse effects on the growth of fish in the culture tank 10 can be effectively suppressed.

[0066] The third path 73 is provided between the cultivation tank 20 and the filtration tank 30, and circulates (returns) the rearing water stored in the cultivation tank 20 to the filtration tank 30. One side (upstream side) end of the third path 73 is connected to the cultivation drainage section 24 of the cultivation tank 20. The other side (downstream side) end of the third path 73 is connected to the second water receiving section 34b of the filtration tank 30. The third path 73 is configured so that the height position generally becomes lower from the upstream side to the downstream side. As a result, the third path 73 can circulate the rearing water that overflows from the cultivation drainage section 24 and is discharged to the outside of the cultivation tub section 21 to the filtration tank 30 by using the height difference between the cultivation tank 20 and the filtration tank 30.

[0067] In this way, in system 1, each component (aquaculture tank 10, cultivation tank 20, filtration tank 30, pump 40, water supply device 50, component addition device 60 and circulation path 70) allows the rearing water to be circulated appropriately between fish farming and plant cultivation, thereby enabling these to be carried out efficiently simultaneously.

[0068] A system 1a according to the second embodiment of the present invention will be described below with reference to FIG.

[0069] In the system 1a according to the second embodiment, the configuration of the filtration tank is significantly different from that of the system 1 according to the first embodiment. In the following, the description will be given focusing on the filtration tank 30a of the system 1a according to the second embodiment, and the same configuration as that of the system 1 according to the first embodiment will be omitted by assigning the same reference numerals. Also in FIG. 6, the illustration of the water supply device 50, the ingredient adding device 60, etc. will be omitted as appropriate.

[0070] As shown in Fig. 6, the filtration tank 30a differs from the filtration tank 30 according to the first embodiment in that the third chamber R3 is partitioned by a third partition plate 238 and divided into two chambers. The third partition plate 238 is included in the partition plate 35. The third partition plate 238 has an opening (third opening 238a) at its lower part. The third opening 238a connects one chamber and the other chamber divided in the third chamber R3 to each other.

[0071] In the following description, one of the two chambers (the chamber adjacent to the second chamber R2 via the second partition plate 37) is referred to as the "upstream third chamber R3a," and the other chamber (the chamber adjacent to the upstream third chamber R3a via the third partition plate 238) is referred to as the "downstream third chamber R3b." In other words, the upstream third chamber R3a is a chamber to which rearing water is supplied from the second chamber R2. The downstream third chamber R3b is a chamber through which rearing water is circulated to the second path 72.

[0072] The upstream third chamber R3a and the downstream third chamber R3b are disposed on the upstream side and the downstream side, respectively, in the direction in which the rearing water flows. The combined size (volume) of the upstream third chamber R3a and the downstream third chamber R3b is configured to be larger than the combined size of the first chamber R1 and the second chamber R2. That is, the amount of rearing water stored in the upstream third chamber R3a and the downstream third chamber R3b is configured to be larger than the amount of rearing water stored in the first chamber R1 and the second chamber R2.

[0073] The filtration tank 30a includes a heater 210. Moreover, the filtration tank 30a includes a first filter medium 232a and a second filter medium 232b instead of the filter medium 32 according to the first embodiment.

[0074] The heater 210 heats the breeding water. The heater 210 is provided in the second chamber R2. The heater 210 is configured to be operable by power supplied from a predetermined power source. The heater 210 adjusts the temperature of the breeding water to an appropriate temperature.

[0075] The first filter medium 232a filters the breeding water (biological filtration). Specifically, the first filter medium 232a supports microorganisms that mainly convert ammonia nitrogen into nitrite nitrogen. That is, the first filter medium 232a oxidizes the ammonia nitrogen in the breeding water flowing from the first chamber R1 to the second chamber R2 (the breeding water passing through the first filter medium 232a) and converts it into nitrite nitrogen. The first filter medium 232a is lighter than the second filter medium 232b and is configured to be removable (replaceable).

[0076] The second filter medium 232b filters the breeding water (biological filtration). Specifically, the second filter medium 232b supports microorganisms that mainly convert nitrite nitrogen to nitrate. That is, the second filter medium 232b oxidizes the nitrite nitrogen in the breeding water flowing from the upstream third chamber R3a to the downstream third chamber R3b (the breeding water passing through the second filter medium 232b) to nitrate.

[0077] With this configuration, in the filtration tank 30a according to the second embodiment, the temperature of the breeding water is adjusted by the heater 210, allowing efficient nitrification.

[0078] Also, unlike the filter medium 32 according to the first embodiment, by dividing the filter medium into two (first filter medium 232a and second filter medium 232b), microorganisms with different properties can be supported in different chambers, allowing efficient nitrification. In addition, the first chamber R1 is supplied with breeding water that is relatively dirtier than that supplied to the third chamber R3, but the first filter medium 232a is lighter than the second filter medium 232b and is removable (replaceable), making maintenance easier.

[0079] In addition, since the heater 210 is provided in a chamber where the water level does not drop (a chamber where the rearing water is supplied to the downstream upstream third chamber R3a by the rearing water overflowing the first partition plate 36), it is possible to prevent the heater 210 from operating when the amount of rearing water is insufficient. In addition, the combined size of the upstream third chamber R3a and the downstream third chamber R3b is configured to be larger than the combined size of the first chamber R1 and the second chamber R2. This makes it possible to prevent water supply problems such as breakdowns caused by, for example, the water level in the downstream third chamber R3b dropping excessively, causing the pump 40 to run idly, etc.

[0080] As described above, the systems 1 and 1a according to the embodiments of the present invention are as follows: An aquaculture tank 10 for storing water in which fish are raised; A filtration tank 30 for filtering the culture water discharged from the culture tank 10; a cultivation tank 20 for cultivating plants using the breeding water filtered by the filtration tank 30; A circulation path 70 that circulates the breeding water between the aquaculture tank 10, the filtration tank 30, and the cultivation tank 20; Equipped with The filtration tank 30 is It is located at a lower position than the aquaculture tank 10 and the cultivation tank 20, A first chamber R1 (filter chamber) for passing the rearing water discharged from the aquaculture tank 10 through a filter medium 32 / a first filter medium 232a (filter medium); A third chamber R3 (adjustment chamber) capable of adjusting the components of the rearing water that has passed through the filter medium 32 and the first filter medium 232a (filter medium); Equipped with The circulation path 70 includes: A first path 71 that circulates the rearing water discharged from the aquaculture tank 10 to the first chamber R1 (filtration chamber) due to a height difference between the aquaculture tank 10 and the filtration tank 30; A second path 72 that circulates the breeding water in the third chamber R3 (adjustment chamber) to the cultivation tank 20 and the aquaculture tank 10 by the power of a pump 40; The following is included:

[0081] With this configuration, it is possible to appropriately manage the components of the rearing water while reducing costs. That is, by separating the filtration tank 30 and the aquaculture tank 10, it is not necessary to provide many filtration tanks 30 for adjusting the composition of the rearing water, and instead the composition of the rearing water can be adjusted using a small number of filtration tanks 30 (for example, one in this embodiment). In addition, by utilizing the height difference between the aquaculture tank 10 and the filtration tank 30 to circulate the rearing water discharged from the aquaculture tank 10 to the first chamber R1 of the filtration tank 30, the number of pumps 40 (the number of devices) for circulating the rearing water can be reduced, and the number of devices that may cause water supply problems can be reduced. Therefore, the composition of the rearing water can be appropriately managed while reducing costs.

[0082] In addition, in the systems 1 and 1a, The filtration tank 30 is The second chamber R2 (backflow prevention chamber) (second chamber) is provided to prevent the breeding water in the third chamber R3 (adjustment chamber) from flowing back into the first chamber R1 (filtration chamber).

[0083] With this configuration, by providing the second chamber R2 (backflow prevention chamber), it is possible to prevent the rearing water in the third chamber R3 (adjustment chamber) from flowing back into the first chamber R1 (filtration chamber), thereby more effectively adjusting the components of the rearing water.

[0084] In addition, in the systems 1 and 1a, The filtration tank 30 is a first partition plate 36 (first partition portion) that separates the first chamber R1 (filtration chamber) and the second chamber R2 (backflow prevention chamber); a second partition plate 37 (second partition portion) that separates the second chamber R2 (backflow prevention chamber) and the third chamber R3 (adjustment chamber); Equipped with The first partition plate 36 is A first opening 36a is formed in the lower portion to connect the first chamber R1 (filter chamber) and the second chamber R2 (backflow prevention chamber), The first chamber R1 (filtration chamber) is The breeding water discharged from the aquaculture tank 10 is supplied from above, and the filter medium 32 / first filter medium 232a (filter medium) is arranged to close the first opening 36a, The second partition plate 37 is A second opening 37a that communicates the second chamber R2 (backflow prevention chamber) and the third chamber R3 (adjustment chamber) is formed in the upper portion.

[0085] With this configuration, the composition of the breeding water can be adjusted more appropriately. That is, by providing the first opening 36a of the first partition plate 36 at the bottom, the rearing water containing a large amount of ammonia nitrogen supplied to the first chamber R1 (filtration chamber) can be prevented from moving directly (without passing through the filter medium 32) to the second chamber R2 (backflow prevention chamber), and the rearing water can be efficiently nitrified. In addition, by configuring the rearing water to move through the second opening 37a at the top of the second partition plate 37 to the third chamber R3 (adjustment chamber) side, the rearing water in the third chamber R3 (adjustment chamber) can be prevented from flowing back into the second chamber R2 (backflow prevention chamber).

[0086] In addition, by dividing the inside of the filtration tank 30 into three sections and appropriately treating and mixing the rearing water from the aquaculture tank 10 and the rearing water from the cultivation tank 20, the balance of nitrate concentration throughout the system 1 can be made uniform, creating an environment that is favorable for both aquaculture and cultivation.

[0087] In addition, in the systems 1 and 1a, The pump 40 is operated so that the water level in the third chamber R3 (adjustment chamber) is lower than the first water level (the position of the lower end of the second opening 37a indicated by symbol P in Figure 4), which is the water level in the second chamber R2 (backflow prevention chamber).

[0088] With this configuration, it is possible to prevent the rearing water in the third chamber R3 (adjustment chamber) from flowing back into the second chamber R2 (backflow prevention chamber).

[0089] In addition, in the systems 1 and 1a, A water supply device 50 capable of supplying water from a water supply source to the third chamber R3 (adjustment chamber) is provided. The water supply device 50 includes: When the water level in the third chamber R3 (adjustment chamber) falls below a second water level (the lower limit of an appropriate water level range) that is lower than the first water level, water is supplied to the third chamber R3 (adjustment chamber).

[0090] This configuration can suppress a decrease in the amount of rearing water circulating through the system 1. This can suppress an excessive decrease in the amount of rearing water due to absorption by the plants in the cultivation tank 20, evaporation, etc., and can further suppress the occurrence of water supply problems.

[0091] In addition, in the systems 1 and 1a, The second path 72 is The third chamber R3 (adjustment chamber) is branched so that the rearing water can be supplied to each of the aquaculture tank 10 and the cultivation tank 20, The circulation path 70 includes: Due to the height difference between the cultivation tank 20 and the filtration tank 30, a third path 73 is included that circulates the rearing water discharged from the cultivation tank 20 to the third chamber R3 (adjustment chamber).

[0092] With this configuration, the nitrate concentration in the breeding water can be appropriately controlled. That is, by returning the rearing water discharged from the cultivation tank 20 (the rearing water in which the nitrate concentration has decreased due to the absorption of nitrate as a nutrient by the plants) to the third chamber R3 (adjustment chamber), the nitrate concentration of the rearing water in the third chamber R3 (adjustment chamber) can be made higher than the nitrate concentration of the rearing water in the cultivation tank 20 and lower than the nitrate concentration of the rearing water in the other chambers of the filtration tank 30. This makes it possible to adjust the nitrate concentration of the rearing water in the third chamber R3 (adjustment chamber) to a level usable for both the cultivation tank 20 and the aquaculture tank 10, and to supply the rearing water to both the cultivation tank 20 and the aquaculture tank 10.

[0093] In addition, by utilizing the difference in height between the cultivation tank 20 and the filtration tank 30, the culture water discharged from the cultivation tank 20 can be returned to the third chamber R3 (adjustment chamber) via the filtration tank 30, thereby reducing the number of pumps 40 required to circulate the culture water.

[0094] In addition, in the system 1a, a third partition plate 238 (third partition portion) that partitions the third chamber R3 (adjustment chamber) into an upstream third chamber R3a (first adjustment chamber) to which rearing water is supplied from the second chamber R2 (backflow prevention chamber) and a downstream third chamber R3b (second adjustment chamber) through which rearing water is circulated to the second path 72; The third partition plate 238 (third partition portion) is A third opening 238a is formed in the lower portion, which communicates the upstream third chamber R3a (first adjustment chamber) and the downstream third chamber R3b (second adjustment chamber). The upstream third chamber R3a (first adjustment chamber) is The breeding water discharged from the second chamber R2 (backflow prevention chamber) is supplied from above, and a second filter material 232b (second filter material) is positioned to block the third opening 238a.

[0095] With this configuration, microorganisms with different properties can be supported in different chambers, allowing nitrification to be carried out efficiently.

[0096] In addition, in the system 1a, In the first filter medium 232a (first filter medium), Converting ammonia contained in the breeding water into nitrite, In the second filter medium 232b (second filter medium), It converts the nitrite contained in the breeding water into nitric acid.

[0097] With this configuration, microorganisms with different properties can be supported in different chambers, allowing nitrification to be carried out efficiently.

[0098] In addition, in this embodiment, the rearing water in the third chamber R3 (adjustment chamber) can be directly supplied to each of the aquaculture tank 10 and the cultivation tank 20 by the power of the pump 40 of the second path 72, so there is no need to provide a height difference between the cultivation tank 20 and the aquaculture tank 10 to allow the rearing water to circulate. If a height difference were provided between the cultivation tank 20 and the aquaculture tank 10, the position of the top tank would be higher, which could increase the burden and cost in terms of construction and workability, but this embodiment can reduce this burden and cost.

[0099] Although the embodiment of the present invention has been described above, the present invention is not limited to the above configuration, and various modifications are possible within the scope of the invention described in the claims.

[0100] For example, the fish cultivated in the fish farm 10 may be freshwater fish rather than saltwater fish.

[0101] In this embodiment, each tank (the aquaculture tank 10, the cultivation tank 20, and the filtration tank 30) is disposed above ground, above the floor surface FL, but is not limited to this. For example, the filtration tank 30 may be buried underground, below the floor surface FL, or another tank (the aquaculture tank 10 or the filtration tank 30) may be disposed below another tank (for example, the space formed by the cultivation tub portion 21 and the cultivation legs 22 of the cultivation tank 20), and each layer may be disposed three-dimensionally (stacked vertically).

[0102] Furthermore, the number of each tank is not limited to that of this embodiment (one of each). That is, the number of each tank may be more than one. Furthermore, when there are more than one tank, it is preferable to make the tanks at different heights so that overflowing rearing water can circulate from one tank to the other tanks. This can prevent an increase in the number of pumps, and can reduce costs.

[0103] In this embodiment, one pump 40 is provided, but multiple pumps 40 may be provided. That is, a pump 40 may be provided to pump the rearing water from the third chamber R3 of the filtration tank 30 to the aquaculture tank 10 or the cultivation tank 20 (a total of two pumps 40).

[0104] In addition, various devices can be added, such as a temperature adjustment device for adjusting the temperature of the breeding water, a removal device for removing proteins contained in the breeding water, and a sterilization device for sterilizing each piece of equipment.

[0105] The configuration of the circulation path 70 is not limited to the above-mentioned configuration. For example, the first path 71 of the circulation path 70 may have only the first main path 71a and may not have the first sub-path 71b. The supply of culture water from the aquaculture tank 10 to the filtration tank 30 in the first main path 71a may utilize the siphon principle or the reverse siphon principle, or a combination of these, instead of utilizing overflow.

[0106] In the present embodiment, the administrator sets the target component and the amount to be added to the component adding device 60 in the input mechanism, but this is not limited to the above. For example, the component adding device 60 may be configured to operate automatically. Specifically, the system 1 in another example shown in FIG. 5 includes a component sensor 133 and a control unit 100.

[0107] The component sensor 133 is capable of detecting the amount of a target component among the components in the breeding water. The component sensor 133 is provided, for example, in the breeding water in the third chamber R3. The control unit 100 is capable of controlling the component adding device 60. The control unit 100 acquires the detection result of the component sensor 133 and controls the component adding device 60 according to the calculation result of the calculation mechanism. For example, when the amount of the target component in the breeding water in the third chamber R3 becomes equal to or less than a predetermined threshold, the control unit 100 operates the component adding device 60 to automatically add the target component to the breeding water. This allows the component adjustment to be performed automatically, thereby improving the efficiency of the component adjustment of the breeding water.

[0108] Thus, in the systems 1 and 1a, a component sensor 133 capable of detecting the amount of a target component among the components of the breeding water in the third chamber R3 (adjustment chamber); A component adding device 60 capable of adding the target component to the breeding water in the third chamber R3 (adjustment chamber); A control unit 100 capable of controlling the ingredient adding device 60; Equipped with The control unit 100 Based on the detection result of the component sensor 133, when the amount of the target component in the breeding water in the third chamber R3 (adjustment chamber) falls below a predetermined threshold, the operation of the component adding device 60 is controlled to add the target component to the breeding water in the third chamber R3 (adjustment chamber).

[0109] This configuration efficiently prevents a decrease in the concentration of the target component (mineral component) in the breeding water circulating through the system 1. In addition, by adding the target component to the breeding water in the third chamber R3 (adjustment chamber), the target component can be efficiently supplied to the entire system 1.

[0110] A system 1b according to a third embodiment of the present invention will be described below with reference to FIG.

[0111] In the system 1b according to the third embodiment, the same components as those in the system 1 according to the first embodiment are denoted by the same reference numerals and description thereof will be omitted.

[0112] First, in the system 1b, the aquaculture tank 10 is placed at a lower position than the cultivation tank 20. Specifically, the height of the water surface of the culture water stored in the aquaculture tank 10 is configured to be lower than the height of the water surface of the culture water stored in the cultivation tank 20.

[0113] Furthermore, the system 1b differs from the system 1 in the configuration of the second path 72. Specifically, in the system 1b, the second path 72 includes two paths (a fourth path 174 and a fifth path 175) that are independent of each other.

[0114] The fourth path 174 is provided between the filtration tank 30 and the cultivation tank 20. The fourth path 174 circulates the rearing water stored in the filtration tank 30 to the cultivation tank 20. One side (upstream side) end of the fourth path 174 is connected to a drain outlet (not shown) provided at the bottom of the third chamber R3 of the filtration tank 30. The other side (downstream side) end of the fourth path 174 is connected to the cultivation tank 20 from above. In addition, a pump 40 is provided in the fourth path 174.

[0115] The fifth path 175 is provided between the cultivation tank 20 and the aquaculture tank 10. The fifth path 175 circulates the rearing water stored in the cultivation tank 20 to the aquaculture tank 10. One side (upstream side) end of the fifth path 175 is connected to the cultivation drainage section 24. The other side (downstream side) end of the fifth path 175 is connected to the aquaculture tank 10 from above. In this way, the fifth path 175 can circulate the rearing water that overflows from the cultivation drainage section 24 and is discharged to the outside of the cultivation tub section 21 to the aquaculture tank 10 by using the height difference between the aquaculture tank 10 and the cultivation tank 20.

[0116] Thus, in the system 1b of the third embodiment, the rearing water stored in the filtration tank 30 is supplied to the cultivation tank 20 using the pump 40, and then the rearing water stored in the cultivation tank 20 is supplied to the aquaculture tank 10 using the height difference between the cultivation tank 20 and the aquaculture tank 10, and then the rearing water stored in the aquaculture tank 10 is supplied to the filtration tank 30 using the height difference between the cultivation tank 30 and the aquaculture tank 30.

[0117] Thus, in system 1b, The cultivation tank 20 is disposed at a higher position than the aquaculture tank 10, The second path 72 includes: A fourth path 174 that circulates the breeding water in the third chamber R3 (adjustment chamber) to the culture tank 20 by the power of the pump 40; A fifth path 175 that circulates the rearing water discharged from the cultivation tank 20 to the aquaculture tank 10 due to a height difference between the cultivation tank 20 and the aquaculture tank 10; The following is included:

[0118] With this configuration, it is possible to supply rearing water having suitable components to the cultivation tank 20 and the aquaculture tank 10, respectively. That is, the rearing water in the third chamber R3 (adjustment chamber) containing a large amount of nitric acid, which is a growth factor for plants, is supplied to the cultivation tank 20, and the nitric acid concentration is reduced as the nitric acid is absorbed by the plants in the cultivation tank 20, so that the rearing water with components suitable for growing fish can be supplied to the aquaculture tank 10. In addition, by utilizing the height difference between the cultivation tank 20 and the aquaculture tank 10 to circulate the rearing water discharged from the cultivation tank 20 to the aquaculture tank 10, the number of pumps 40 for circulating the rearing water can be reduced. [Explanation of symbols]

[0119] 1 System (Aquaponics System) 10 Aquaculture tanks 20 cultivation tank 30 Filtration tank 32 Filter media 40 Pump 70 Circulation Route 71 First Route 72 Second Route 73 Third Path

Claims

1. a fish farm tank for storing water in which fish are raised; a filtration tank for filtering the culture water discharged from the culture tank; a cultivation tank for cultivating plants using the breeding water filtered in the filtration tank; A circulation path for circulating the rearing water among the aquaculture tank, the filtration tank, and the cultivation tank; Equipped with The filtration tank comprises: Located at a lower position than the aquaculture tank and the cultivation tank, a filtration chamber for passing the rearing water discharged from the aquaculture tank through a first filter medium; an adjustment chamber capable of adjusting the components of the rearing water that has passed through the first filter; Equipped with The circulation path includes: a first passage for circulating the rearing water discharged from the aquaculture tank to the filtration chamber by a height difference between the aquaculture tank and the filtration tank; A second passage for circulating the rearing water in the adjustment chamber to the cultivation tank and the aquaculture tank by the power of a pump; Contains, Aquaponics system.

2. The filtration tank comprises: A backflow prevention chamber is provided to prevent the rearing water in the adjustment chamber from flowing back into the filtration chamber.

2. The aquaponics system of claim 1.

3. The filtration tank comprises: a first partition portion that separates the filtration chamber and the backflow prevention chamber; A second partition portion that separates the backflow prevention chamber and the adjustment chamber; Equipped with The first partition portion is A first opening that connects the filtration chamber and the backflow prevention chamber is formed in a lower portion, The filtration chamber is The culture water discharged from the culture tank is supplied from above, and the first filter medium is arranged to close the first opening, The second partition portion is A second opening portion is formed in the upper portion to communicate the backflow prevention chamber with the adjustment chamber.

3. The aquaponics system of claim 2.

4. a component sensor capable of detecting an amount of a target component among the components of the breeding water in the adjustment chamber; a component adding device capable of adding the target component to the breeding water in the adjustment chamber; A control unit capable of controlling the ingredient adding device; Equipped with The control unit is When the amount of the target component in the breeding water in the adjustment chamber becomes equal to or less than a predetermined threshold based on the detection result of the component sensor, the operation of the component adding device is controlled so as to add the target component to the breeding water in the adjustment chamber.

2. The aquaponics system of claim 1.

5. The second pathway is The culture water in the adjustment chamber is branched so as to be able to be supplied to each of the aquaculture tank and the cultivation tank, The circulation path includes: A third path is included, which circulates the rearing water discharged from the cultivation tank to the adjustment chamber due to a height difference between the cultivation tank and the filtration tank.

2. The aquaponics system of claim 1.

6. The cultivation tank is disposed at a higher position than the aquaculture tank, The second pathway includes: A fourth passage that circulates the breeding water in the adjustment chamber to the cultivation tank by the power of the pump; A fifth path that circulates the rearing water discharged from the cultivation tank to the aquaculture tank due to a height difference between the cultivation tank and the aquaculture tank; Contains, 2. The aquaponics system of claim 1.

7. a third partition portion that divides the adjustment chamber into a first adjustment chamber to which the rearing water is supplied from the backflow prevention chamber and a second adjustment chamber that allows the rearing water to flow to the second path, The third partition portion is A third opening that communicates the first adjustment chamber with the second adjustment chamber is formed in the lower portion, The first adjustment chamber is The rearing water discharged from the backflow prevention chamber is supplied from above, and a second filter medium is disposed so as to close the third opening.

4. The aquaponics system of claim 3.

8. In the first filter medium, The ammonia nitrogen contained in the breeding water is converted into nitrite nitrogen, In the second filter medium, Converting nitrite nitrogen contained in the breeding water into nitrate; 8. The aquaponics system of claim 7.

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