Land-based canvas pool litopenaeus vannamei recirculating aquaculture system

Abstract

The technical scheme of the utility model discloses a land-based canvas pool litopenaeus vannamei recirculating aquaculture system which comprises an aquaculture pool, and the edge of the bottom of the aquaculture pool inclines towards the center so as to enable aquaculture water and impurities to converge towards the center to a fish closestool. The settling pond is connected with an outlet of the fish closestool through a drainage pipe, and the fluidized bed is connected with the settling pond through a water guide pipe arranged at the water outlet channel; and the microfiltration part is connected with the fluidized bed and the culture pond through a water conduit and a water return pipe respectively. The bottom of the culture pond is inclined, water is drained from the center of the culture pond and enters the culture pond tangentially, so that vortexes are formed in the culture pond, and residual feed, excrement and the like are quickly concentrated towards the water outlet in the center of the bottom of the culture pond under the action of tangential force of water flow. Through a plurality of water inlet pipes and water outlet pipes, the effect of water quality circulation of the culture pond, the sedimentation pond, the fluidized bed biological filter and the rotary drum type micro-filter is achieved, and the problems that suspended solids and ammonia nitrogen are prone to being generated in a traditional prawn culture technology and the nitrite concentration is continuously increased are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of aquaculture systems, in particular to a land-based canvas pond Litopenaeus vannamei recirculating aquaculture system. Background Art

[0002] The recirculating aquaculture mode is an advanced representative of industrialized aquaculture technology. It refers to a series of water treatment technologies such as physical treatment and biological filtration of aquaculture water to remove suspended particles, ammonia nitrogen, nitrite and other organic and inorganic substances harmful to aquaculture organisms in the aquaculture water, so as to achieve the purpose of purifying the water body and recycling it. The recirculating aquaculture technology mode realizes the recycling of aquaculture water, greatly reduces the discharge of aquaculture tail water, and solves the resource problems and environmental protection problems that restrict the development of the aquaculture industry nowadays.

[0003] However, the traditional recirculating aquaculture system has a high cost. Recirculating aquaculture involves land hardening. Due to the demand for food in China, it is determined that the protection of cultivated land is extremely important. China is still in the period of rapid industrialization and urbanization, the pressure to protect cultivated land is increasing, and the task of ensuring national food security is becoming more and more arduous. Content of the Utility Model

[0004] The technical problem solved by the utility model is that the traditional recirculating aquaculture system has a high cost and cannot protect cultivated land.

[0005] To solve the above technical problems, the technical solution of the utility model provides a land-based canvas pond Litopenaeus vannamei recirculating aquaculture system, which includes:

[0006] A culture pond, at the central position of the bottom of which there is a fish toilet, and the edge of the bottom inclines towards the center so that the aquaculture water and impurities converge towards the center and flow into the fish toilet;

[0007] A sedimentation pond, which is connected to the outlet of the fish toilet through a drain pipe for discharging aquaculture water. The drain pipe is inserted into a diverter arranged at the central position of the bottom of the sedimentation pond so that the aquaculture water flows to the bottom of the sedimentation pond through the diverter. An overflow weir is arranged at the top edge of the sedimentation pond, and a top ring is connected to the outside of the top to form a water outlet channel;

[0008] A fluidized bed, which is connected to the sedimentation pond through a water guide pipe arranged at the water outlet channel;

[0009] A microfiltration part, which is respectively connected to the fluidized bed and the culture pond through a water inlet pipe and a return pipe to filter the aquaculture water from the water inlet pipe and return it to the culture pond through the return pipe; and

[0010] An air supply part, which is respectively connected to the culture pond and the fluidized bed through an air supply pipe to supply oxygen.

[0011] Optionally, the gas delivery section includes:

[0012] A gas source;

[0013] A main gas pipe connected to the gas source;

[0014] Bronchial tubes arranged around the culture pond and connected to the main gas pipe;

[0015] An intake manifold arranged beside the fluidized bed and connected to the main gas pipe;

[0016] A nano-aeration pipe provided at the bottom of the culture pond;

[0017] A nano-aeration disk provided at the bottoms of the culture pond and the fluidized bed;

[0018] An intake hose with both ends respectively connected to the bronchial tubes, the intake manifold, the nano-aeration pipe and / or the nano-aeration disk.

[0019] Optionally, the nano-aeration disk includes:

[0020] A first nano-aeration disk, with four in number, provided at the bottom of the culture pond and evenly surrounding the outside of the fish toilet;

[0021] A second nano-aeration disk provided at the bottom of the fluidized bed.

[0022] Optionally, the intake hose includes:

[0023] A first intake hose, with one end connected to the bronchial tube and the other end connected to the nano-aeration pipe and the first nano-aeration disk, and the first nano-aeration disk, the nano-aeration pipe and the first intake hose are in communication;

[0024] A second intake hose with both ends respectively connected to the intake manifold and the second nano-aeration disk.

[0025] Optionally, the culture pond is circular, the bronchial tubes are arranged around the culture pond and are circular, the number of the first intake hoses is multiple and they are evenly distributed in the circumferential direction of the bronchial tubes, and four of the first intake hoses are connected to the nano-aeration pipe and the first nano-aeration disk.

[0026] Optionally, the microfiltration section includes:

[0027] A drum microfilter, whose water inlet is connected to the fluidized bed through the water diversion pipe;

[0028] A water storage bucket connected to the water outlet of the drum microfilter and connected to the culture pond through the water return pipe.

[0029] Optionally, an ultrasonic flowmeter is provided in the return water pipe.

[0030] Optionally, a sewage pump equipped with a liquid level float controller is integrated in the water storage bucket.

[0031] Optionally, flower drains are provided at the center of the fish toilet and at one end of the water inlet pipe located in the fluidized bed.

[0032] Optionally, the air supply source includes a Roots blower.

[0033] The beneficial effects of the technical solution of the present utility model are as follows:

[0034] The bottom of the culture pond of the present utility model is inclined, with central drainage and tangential water inlet in the pond, so as to form a vortex in the pond. Residual baits, feces, etc. are quickly concentrated towards the central water outlet at the bottom of the pond under the action of the tangential force of the water flow. Through multiple water inlet pipes and outlet pipes, the water quality circulation of the culture pond, sedimentation pond, fluidized bed biological filter and drum microfilter is realized, solving the problems of easy generation of suspended substances and ammonia nitrogen in the traditional shrimp culture technology, as well as the problem of continuous increase in nitrite concentration. The culture pond is constructed by galvanized sheets and canvas ponds, and the materials of the sedimentation pond and the fluidized bed are PE, which is convenient for later disassembly, realizing the protection of cultivated land and the efficient utilization of land resources. Description of the Drawings

[0035] Figure 1 It is a schematic structural diagram of the circulating water culture system in the embodiment of the present utility model;

[0036] Figure 2 It is a schematic structural diagram of the culture pond in the embodiment of the present utility model;

[0037] Figure 3 It is a schematic structural diagram of the sedimentation pond in the embodiment of the present utility model;

[0038] Figure 4 It is a schematic structural diagram of the fluidized bed in the embodiment of the present utility model;

[0039] Figure 5 It is a schematic structural diagram of the microfiltration part in the embodiment of the present utility model.

[0040] In the drawings: 1. Culture pond, 2. Sedimentation pond, 3. Fluidized bed, 4. Microfiltration part, 5. Air supply part, 6. Drain pipe, 7. Guide pipe, 8. Second water inlet hose, 9. Water inlet pipe, 11. Bronchus, 12. First water inlet hose, 13. Nano aeration pipe, 14. First nano aeration disk, 15. Fish toilet, 16. Flower drain, 21. Flow deflector, 22. Water outlet channel, 23. Overflow weir, 24. Top ring, 31. Second nano aeration disk, 41. Drum microfilter, 42. Water storage bucket, 43. Return water pipe, 44. Ultrasonic flowmeter, 51. Air supply source, 52. Main air pipe, 53. Intake manifold. Detailed implementation mode

[0041] The following further describes the present utility model in conjunction with the accompanying drawings and specific embodiments, but it is not a limitation of the present utility model.

[0042] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation of the present utility model.

[0043] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality" means two or more unless otherwise specifically defined.

[0044] In the present utility model, unless otherwise clearly defined and limited, the terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0045] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "above" and "on the top" of the second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below" and "under the bottom" of the second feature includes that the first feature is directly below and obliquely below the second feature, or simply means that the horizontal height of the first feature is lower than that of the second feature.

[0046] Please refer to Figure 1 , Figure 2 , Figure 3 andFigure 4 As shown in the figure, a land-based canvas pond Litopenaeus vannamei recirculating aquaculture system of an embodiment is shown. Among them, it includes a culture pond 1, at the center of the bottom of which there is a fish toilet 15, and the edge of the bottom inclines towards the center so that the culture water and impurities converge towards the center and flow into the fish toilet 15; a sedimentation pond 2, which is connected to the outlet of the fish toilet 15 through a drain pipe 6 for discharging the culture water. The drain pipe 6 is inserted into a diverter 21 arranged at the center of the bottom of the sedimentation pond 2 so that the culture water flows through the diverter 21 to the bottom of the sedimentation pond 2. An overflow weir 23 is provided at the top edge of the sedimentation pond 2, and a top ring 24 is connected to the outside of the top to form a water outlet channel 22. The sedimentation pond 2 and the top ring 24 are connected by a connecting rod (not shown) or other means (which belongs to the prior art and will not be elaborated here); a fluidized bed 3, which is connected to the sedimentation pond 2 through a water guide pipe 7 arranged at the water outlet channel 22; a microfiltration part 4, which is respectively connected to the fluidized bed 3 and the culture pond 1 through a water inlet pipe 9 and a return pipe 43 to filter the culture water from the water inlet pipe 9 and return it to the culture pond 1 through the return pipe 43; and an air supply part 5, which is respectively connected to the culture pond 1 and the fluidized bed 3 through an air supply pipe to supply oxygen.

[0047] In this embodiment, as Figure 1 and Figure 2 shown, the air supply part 5 includes an air supply source 51; a main air pipe 52, which is connected to the air supply source 51; a branch air pipe 11, which is arranged around the culture pond 1 and is connected to the main air pipe 52; an intake manifold 53, which is arranged beside the fluidized bed 3 and is connected to the main air pipe 52; a nano aeration pipe 13, which is arranged at the bottom of the culture pond 1; a nano aeration disk, which is arranged at the bottoms of the culture pond 1 and the fluidized bed 3; an intake hose, with both ends respectively connected to the branch air pipe 11, the intake manifold 53 and the nano aeration pipe 13 and / or the nano aeration disk.

[0048] In this embodiment, as Figure 2 and Figure 4 shown, the nano aeration disk includes a first nano aeration disk 14, the number of which is four and is arranged at the bottom of the culture pond 1 and evenly surrounds the outside of the fish toilet 15; a second nano aeration disk 31, which is arranged at the bottom of the fluidized bed 3.

[0049] In this embodiment, as Figure 1 and Figure 2 shown, the intake hose includes a first intake hose 12, one end of which is connected to the branch air pipe 11, and the other end is connected to the nano aeration pipe 13 and the first nano aeration disk 14. The first nano aeration disk 14, the nano aeration pipe 13 and the first intake hose 12 are communicated with each other; a second intake hose 8, with both ends respectively connected to the intake manifold 53 and the second nano aeration disk 31.

[0050] In this embodiment, as Figure 2As shown, the aquaculture pond 1 is circular, the bronchus 11 is arranged around the aquaculture pond 1 and is circular, the number of the first intake hoses 12 is multiple and they are evenly distributed in the circumferential direction of the bronchus 11, and four first intake hoses 12 are connected to the nano aeration pipe 13 and the first nano aeration disk 14.

[0051] In this embodiment, as Figure 1 and Figure 5 shown, the microfiltration part 4 includes a drum microfilter 41, whose water inlet is connected to the fluidized bed 3 through a water diversion pipe 9; a water storage bucket 42, which is connected to the water outlet of the drum microfilter 41 and is connected to the aquaculture pond 1 through a return pipe 43, and an ultrasonic flowmeter 44 is arranged in the return pipe 43, and a sewage pump equipped with a liquid level float controller is integrated in the water storage bucket 42.

[0052] In this embodiment, as Figure 2 and Figure 4 shown, flower drains 16 are arranged at the center of the fish toilet 15 and at one end of the fluidized bed where the water diversion pipe 9 is located.

[0053] In this embodiment, the air supply source 51 includes a Roots blower.

[0054] The characteristics and functions of the present utility model are further understood through the following description.

[0055] A land-based canvas pond Litopenaeus vannamei recirculating aquaculture system provided by the present utility model includes an aquaculture pond 1, a water treatment system and an aeration system: among them, the water treatment system includes a sedimentation pond 2, a fluidized bed 3 biological filter, a drum microfilter 41 and an ultrasonic flowmeter 44 connected in sequence. Through the water treatment system, the treated purified water is then circulated back to the aquaculture pond 1 to achieve the purpose of circular aquaculture.

[0056] The aquaculture pond 1 is constructed and surrounded by galvanized plates and a canvas pond to form a circle, and the bottom of the pond has a sloping surface with a slope that facilitates the concentration of pollution at the water outlet at the bottom center where the fish toilet 15 is located. By constructing the circular aquaculture pond 1 with galvanized plates and a canvas pond, the construction is simple and it is convenient for later disassembly.

[0057] The water outlet is an opening in the middle of the bottom of the aquaculture pond 1 where the fish toilet 15 is provided, forming a water outlet. The fish toilet 15 and the middle opening at the bottom of the aquaculture pond 1 form a water outlet, and through the fish toilet 15, it is convenient to introduce the aquaculture water body into the water treatment system and discharge it to ensure the discharge and circulation of aquaculture.

[0058] The water inlet of the fish toilet 15 is inserted into the flower drain 16, the water outlet is connected to the main water pipe, and a ball valve switch is arranged on the branch water pipe. By arranging the flower drain 16 at the water inlet of the fish toilet 15, it can prevent the shrimp from being discharged out of the pond and entering the water treatment system.

[0059] The oxygen-increasing system includes a Roots blower 51, a gas transmission pipe, a gas transmission hose, a ball valve, a gas valve, a nano-aeration pipe 13 and a nano-aeration disc. The air outlet of the Roots blower 51 is connected to the gas transmission pipe. The gas transmission pipe includes a main gas pipe 52 and a branch gas pipe 11. The branch gas pipe 11 is provided with a ball valve. The gas transmission pipe (i.e., the first air inlet hose 12) is connected through to the nano-aeration pipe 13 and the nano-aeration disc 14. The air inlet end of the first air inlet hose 12 is provided with a gas valve, and the gas valve is arranged on the branch gas pipe 11 around the aquaculture pond. Nano-aeration pipes 13 and nano-aeration discs 14 are arranged on the inner side of the bottom of the aquaculture pond 1. The nano-aeration pipes 13 are arranged around the inner bottom of the aquaculture pond 1, and the nano-aeration discs 14 are arranged near the water outlet. Through the Roots blower 51, air is inhaled; through the gas transmission pipe, it is convenient to transport the air to the gas transmission pipe; through the gas transmission hose, the air is transported to the nano-aeration pipe 13 and the nano-aeration disc 14; through the nano-aeration pipe 13, nano-aeration strips and a number of holes, it is convenient to discharge oxygen into the aquaculture pond 1 to ensure sufficient oxygen in the aquaculture pond 1; through the ball valve arranged at the connection of the gas transmission pipe and the gas valve arranged at the air inlet end of the gas transmission hose, it is convenient to control the overall and individual air delivery volumes. Among them, the Roots blower injects air into the nano-aeration pipe and the nano-aeration disc. The pipe and the disc have many small holes, which can make the air form tiny bubbles, increasing the contact area between the air and the water body, thereby increasing the dissolved oxygen in the water body.

[0060] The water treatment system includes a sedimentation tank 2, two fluidized bed 3 biological filters, a drum microfilter 41 and an ultrasonic flowmeter 44. Three water guide pipes 7 are arranged in the water outlet area of the sedimentation tank 2, and the other ends of the water guide pipes 7 are arranged at the bottom of the fluidized bed 3 biological filter. The fluidized bed 3 biological filters are connected through a water inlet pipe 9. The fluidized bed 3 biological filter is connected to the drum microfilter 41 at the back. The water outlet of the drum microfilter 41 is arranged inside a water storage bucket 42. A sewage pump is arranged in the water storage bucket 42, and a liquid level float controller is arranged on the sewage pump. An ultrasonic flowmeter 44 is arranged on the return water pipe 43 of the sewage pump. The large-diameter organic suspended particulate matter in the aquaculture water is removed by the sedimentation tank 2, the small-diameter organic suspended particulate matter in the aquaculture water is removed by the drum microfilter 41, and the ammonia nitrogen and nitrite in the aquaculture water are removed by the fluidized bed 3 biological filter; the purified water body is pumped into the aquaculture pond by the sewage pump in the water storage bucket 42 to realize the circulation of the aquaculture water body; the operation of the sewage pump is controlled by the liquid level float controller; the flow rate is monitored in real time by the ultrasonic flowmeter 44.

[0061] The sedimentation tank 2 includes a drain pipe 6, a flow guide device 21, the sedimentation tank body, an overflow weir 23 and a water outlet channel 22. One end of the drain pipe 6 passes through the sedimentation tank 2 and the flow guide device 21. The flow guide device 21, the sedimentation tank body, the overflow weir 23 and the water outlet channel 22 are made of PE. Through the drain pipe 6, it is convenient for the aquaculture water to overflow in the middle of the sedimentation tank 2; through the flow guide device 21, it is convenient for the aquaculture water to flow from the aquaculture water to the bottom of the sedimentation tank 2; through the overflow weir 23, it is ensured that the clarified water after sedimentation can uniformly flow into the water outlet channel along the pool width; the flow guide device 21, the sedimentation tank body, the overflow weir 23 and the water outlet channel 22 are made of PE, which is convenient for later disassembly.

[0062] In the fluidized bed 3 biological filter, a second nano aeration disc 31 is provided. The nano aeration disc 31 is connected to the second intake hose 8. A flower drain 16 is provided at the water outlet of the fluidized bed 3 biological filter. Through the second intake hose 8, air is transported to the second nano aeration disc 31 to provide the oxygen required for the nitrification reaction in the fluidized bed 3 biological filter. Through the flower drain 16, it is prevented that the packing is discharged along with the water flow.

[0063] In addition, it is worth noting that in this embodiment, preferably, the sedimentation tank and the fluidized bed are made of PE, the water pipe is made of PVC, and the microfilter is a small integrated movable structure. Of course, in other embodiments, it can be in other structural forms, which will not be elaborated here. At the same time, when in use, there is no need for land hardening, and the soil can be directly compacted for use.

[0064] The working principle of the land-based canvas pond Litopenaeus vannamei recirculating aquaculture system of this embodiment is as follows:

[0065] When it is necessary to treat the aquaculture water in the aquaculture pond 1, first open the ball valve at the sedimentation tank 2 to make the aquaculture water enter the sedimentation tank 2 through the drain pipe 6 at the bottom; then the aquaculture water is preliminarily sedimented in the sedimentation tank 2, and then through the water outlet channel 22 of the sedimentation tank 2, the aquaculture water is guided into the fluidized bed 3 biological filter. Then, the microorganisms attached to the surface of the packing in the fluidized bed 3 biological filter remove ammonia nitrogen and nitrite in the aquaculture water, and then it is guided into the drum microfilter 41 to remove small-diameter suspended matter particles in the aquaculture water, and then it is guided into the water storage bucket 42. When the water level in the water storage bucket 42 reaches a certain level, the internal sewage pump is started to return the aquaculture water to the aquaculture pond 1, so as to achieve the purpose of circulating water treatment of the aquaculture water.

[0066] In summary, the bottom of the aquaculture pond of the present utility model is inclined, with central drainage and tangential water inlet in the pond, so as to form a vortex in the pond, and residual baits, feces, etc. are quickly concentrated towards the central water outlet at the bottom of the pond under the action of the tangential force of the water flow. Through multiple water inlet pipes and outlet pipes, the function of water quality circulation among the aquaculture pond, sedimentation pond, fluidized bed biological filter and drum microfiltration machine is realized, solving the problems of easy generation of suspended substances and ammonia nitrogen, as well as the continuous increase of nitrite concentration in the traditional prawn aquaculture technology. The aquaculture pond is constructed by galvanized sheet and canvas pond, and the materials of the sedimentation pond and fluidized bed are PE, which is convenient for later disassembly, realizing the protection of cultivated land and the efficient utilization of land resources.

[0067] The above are only the preferred embodiments of the present utility model, and do not limit the implementation manners and protection scope of the present utility model. For those skilled in the art, it should be realized that all the equivalent replacements and obvious changes made by using the description and illustrations of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A land-based canvas pond Litopenaeus vannamei circulating water culture system, characterized in that: include: A breeding pond, wherein a fish toilet is provided at the center of the bottom, and the edge of the bottom is inclined toward the center so that the breeding water and impurities flow toward the center to the fish toilet; A sedimentation tank, which is connected to the outlet of the fish toilet through a drainage pipe for discharging aquaculture water, the drainage pipe is inserted into a flow guide arranged at the center of the bottom of the sedimentation tank so that the aquaculture water flows to the bottom of the sedimentation tank through the flow guide, an overflow weir is arranged at the top edge of the sedimentation tank, and a top ring is connected to the outer side of the top to form a water outlet channel; A fluidized bed connected to the sedimentation tank via a water conduit disposed at the outlet channel; A microfiltration unit, which is connected to the fluidized bed and the culture pond through a water inlet pipe and a water return pipe, respectively, so as to filter the culture water from the water inlet pipe and return the culture water from the water return pipe to the culture pond; as well as The gas delivery part is connected to the culture pond and the fluidized bed through gas delivery pipes to deliver oxygen.

2. The land-based canvas pond Penaeus vannamei circulating water culture system according to claim 1, characterized in that: The gas delivery unit comprises: Gas source; A main gas pipe connected to the gas supply source; A bronchial tube, arranged around the culture pond and connected to the main trachea; an air intake manifold, arranged beside the fluidized bed and connected to the main air pipe; A nano aeration tube is arranged at the bottom of the culture pond; A nano aeration plate is arranged at the bottom of the culture pond and the fluidized bed; The two ends of the air intake hose are respectively connected to the bronchial pipe, the air intake manifold and the nano aeration tube and / or the nano aeration plate.

3. The land-based canvas pond Penaeus vannamei circulating water culture system according to claim 2, characterized in that: The nano aeration plate comprises: Four first nano-aeration plates are disposed at the bottom of the culture pond and evenly surround the outside of the fish toilet; The second nanometer aeration plate is arranged at the bottom of the fluidized bed.

4. The land-based canvas pond Penaeus vannamei circulating water culture system according to claim 3, characterized in that: The air intake hose comprises: a first air inlet hose, one end of which is connected to the bronchial tube, and the other end of which is connected to the nano aeration tube and the first nano aeration plate, wherein the first nano aeration plate, the nano aeration tube and the first air inlet hose are in communication; The second air intake hose has two ends respectively connected to the air intake manifold and the second nano aeration plate.

5. The land-based canvas pond Penaeus vannamei circulating water culture system according to claim 4, characterized in that: The breeding pond is circular, the bronchus is arranged around the breeding pond and is circular, there are multiple first air intake hoses which are evenly distributed in the circumferential direction of the bronchus, and four first air intake hoses connect the nano aeration tube and the first nano aeration plate.

6. The land-based canvas pond Penaeus vannamei circulating water culture system according to claim 5, characterized in that: The microfiltration unit comprises: A rotary drum microfilter, whose water inlet is connected to the fluidized bed through the water diversion pipe; The water storage bucket is connected to the water outlet of the rotary drum microfilter and is connected to the breeding pond through the return pipe.

7. The land-based canvas pond Penaeus vannamei circulating water culture system according to claim 6, characterized in that: An ultrasonic flow meter is arranged in the water return pipe.

8. The land-based canvas pond Penaeus vannamei circulating water culture system according to claim 7, characterized in that: A sewage pump equipped with a liquid level float controller is integrated in the water storage barrel.

9. The land-based canvas pond Penaeus vannamei circulating water culture system according to claim 8, characterized in that: The center of the fish toilet and one end of the water diversion pipe located at the fluidized bed are both provided with flower drains.

10. The land-based canvas pond Penaeus vannamei circulating water culture system according to claim 9, characterized in that: The gas supply source includes a Roots blower.

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