Factory-like circulating water culture system and culture method for aquaculture

Abstract

The invention relates to the technical field of aquaculture, and discloses a factory-like circulating aquaculture system and method for aquaculture, and the system comprises one or more aquaculture units, a biological filtration unit and a water circulation filtration unit. Water in the culture ponds in the culture units flows into the microstrainers through independent water outlet pipes at the bottoms of the culture ponds to be primarily filtered, so that suspended particles such as residual feed and excrement in the water are effectively removed (discharged into the sewage pond); particulate matters such as residual feeds and excrement in water bodies are quickly pressed into the microfilters by the aid of high pressure of the water bodies during drainage at the bottoms of the culture ponds, and accordingly the removal efficiency of suspended particles in the water bodies of the culture ponds can be greatly improved; harmful substances such as ammonia nitrogen and nitrite in the water body are removed, the water quality is further improved, and the problems that an existing system is low in suspended particulate matter treatment efficiency, poor in biochemical treatment effect, high in cost, poor in circulation balance and the like are effectively solved.

Description

Technical Field

[0001] The present invention relates to the technical field of aquaculture, and particularly relates to an industrialized recirculating aquaculture system and an aquaculture method for aquaculture. Background Art

[0002] With the rapid development of the global aquaculture industry, traditional open aquaculture models face many problems such as water resource waste, environmental pollution, and disease transmission. As an efficient and environmentally friendly aquaculture method, recirculating aquaculture systems have become an important direction and future trend for the transformation of aquaculture methods, structural adjustment, and low-carbon green development in China. However, there are still some technical deficiencies in the application of existing recirculating aquaculture systems in freshwater fish farming, which are specifically reflected in the following aspects:

[0003] 1. Low efficiency in removing suspended particulate matter: The removal of suspended particulate matter such as residual bait and feces in the water body is one of the cores for purifying aquaculture water. In the prior art, most recirculating aquaculture systems rely on designing the structure of the inlet pipe to affect the generation of a stable circulation of the water body in the aquaculture pond, so that the suspended particulate matter can be smoothly discharged. However, during high-density aquaculture, when multiple aquaculture ponds share a set of microfiltration machines, excessive suspended particulate matter will cause the working pressure of the microfiltration machine to be too high. To alleviate this problem, it is usually necessary to equip each aquaculture pond with a vertical flow sedimentation tank, but its cost is high and the sedimentation effect is poor, and manual active sewage discharge is required. In addition, the bottom drain of the aquaculture pond (containing a large amount of suspended particulate matter) is connected to the vertical flow sedimentation tank and then enters the microfiltration machine, while the surface drain (containing less suspended particulate matter) is directly connected to the microfiltration machine. This design not only increases the complexity of the system but also makes it difficult to achieve the goal of efficiently removing suspended particulate matter;

[0004] 2. Poor biochemical treatment effect of the water body: Traditional recirculating aquaculture systems improve the biochemical treatment effect by increasing the residence time of the water body in the biological filter, but this method requires making the biochemical pool larger and higher, resulting in increased construction costs and energy consumption. A higher biological filter needs to be strengthened and reinforced, and at the same time, it will affect the aeration effect of the biological filler, and then the power of the aeration fan needs to be increased. In addition, in an aquaculture system equipped with a heating system, a higher and larger biological filter has a higher heat loss rate, which is not conducive to the heat preservation efficiency of the system;

[0005] 3. High system construction and breeding costs: In the existing recirculating aquaculture system, the use of vertical flow sedimentation tanks increases the equipment cost and maintenance difficulty. Each aquaculture pond needs to be equipped with a vertical flow sedimentation tank, and its selling price ranges from 1,000 yuan to 7,000 yuan per unit according to the water body circulation volume. In addition, to design a reasonable inlet pipe structure to form a stable circulation, an inlet water pump needs to be added, resulting in an increase in construction cost and production cost. If the water inlet is completed by using the height difference, the water velocity in the aquaculture pond will change with the water level of the high-level pond, affecting the growth of fish. In addition, in the existing system, the lift pump and blower are fully opened throughout the process, resulting in high power consumption and being unfavorable for the balanced exchange of water bodies. Most systems do not reasonably consider the height difference of each component during construction, resulting in the need for more lift pumps, further increasing the cost and energy consumption.

[0006] 4. Poor water circulation balance: If the height difference relationship of each component is not reasonably considered in the aquaculture system, there is a risk of water overflow in many places. In an aquaculture system with a large water body, an unreasonable water outlet method and pipeline layout scheme are likely to cause the water outlet of the aquaculture pond to be unsmooth, and finally water overflow occurs, affecting the stable operation of the system. Summary of the Invention

[0007] The purpose of the present invention is to provide an industrialized recirculating aquaculture system and aquaculture method for aquaculture, aiming to solve the problems of low treatment efficiency of suspended particles, poor biochemical treatment effect, high cost and poor circulation balance existing in the existing system.

[0008] The above technical purpose of the present invention is achieved through the following technical solutions:

[0009] An industrialized recirculating aquaculture system for aquaculture includes one or more aquaculture units, a biological filtration unit and a water circulation filtration unit. Each aquaculture unit includes at least one independent aquaculture pond. The biological filtration unit includes a biological filter tank with internal biological fillers. The water circulation filtration unit includes a microfilter, a sewage discharge pond and a water storage pond. The aquaculture ponds in each aquaculture unit are all communicated with the water inlet of the microfilter through independent outlet pipes arranged at the bottom. The drainage outlet of the microfilter is communicated with the water inlet of the biological filter tank through a drainage pipe. The sewage discharge port of the microfilter is communicated with the sewage discharge pond. The biological filter tank is communicated with the water inlet pipe of the water storage pond through a circulation pump. The bottom of the water storage pond is communicated with the aquaculture pond through an aquaculture pond inlet pipe.

[0010] By adopting the above technical solution, the water in the aquaculture ponds in each of the aquaculture units flows into the microfilter through the independent outlet pipes at the bottom for primary filtration, so that suspended particles such as residual baits and feces in the water are effectively removed (discharged into the sewage pond). Each aquaculture pond uses the relatively large pressure of the water body when draining water at the bottom to quickly press the particles such as residual baits and feces in the water body into the microfilter, greatly improving the removal efficiency of suspended particles in the water of the aquaculture pond. Moreover, there is no need to additionally set up high-cost sedimentation devices, greatly reducing the equipment investment and maintenance costs. The clear water after primary filtration by the microfilter then enters the biological filter for biodegradation to remove harmful substances such as ammonia nitrogen and nitrite in the water body, further improving the water quality. The water purified by biodegradation is pumped back to the reservoir through the circulation pump, and then re-injected into the aquaculture pond through the inlet pipe at the bottom of the reservoir, forming an efficient circulating water system to ensure that the water quality in the aquaculture pond always remains stable. In the whole process, each unit operates in coordination to jointly achieve the balance of water body circulation. Not only is the water resource loss small, but also the energy consumption is low and the aquaculture efficiency is high.

[0011] A further setting of the present invention is that: a water level control mechanism is provided between the outlet pipe and the water inlet of the microfilter. The water level control mechanism includes a water level controller and an overflow pipe. The upper end of the overflow pipe is provided with an overflow port, and a water level adjusting pipe is inserted into the overflow port. The lower end of the overflow pipe is communicated with the outlet pipe. The drain port of the water level controller is communicated with the circulation pipeline through a water level control connection pipe, and the circulation pipeline is communicated with the water inlet of the microfilter.

[0012] By adopting the above technical solution, when the water level in the aquaculture pond is higher than the overflow port of the overflow pipe in the water level control mechanism, the excess water automatically enters the overflow pipe through the outlet pipe at its bottom and is discharged into the water level controller from the overflow port of the overflow pipe, and then is discharged from the drain port at the bottom of the water level controller into the circulation pipeline, and finally is discharged into the microfilter through the circulation pipeline. The water outlet height of the overflow port matches the set water level height in the aquaculture pond to ensure the stability of the water level in the aquaculture pond and prevent the water body in the aquaculture pond from overflowing due to being too full. The setting of the extraction pipe is used to adjust the drainage height of the overflow port. By changing the insertion depth of the extraction pipe, the water level of the aquaculture pond can be flexibly controlled. The control process is simple, the operation is convenient, there is no need for additional equipment investment, further optimizing the system operation efficiency, ensuring the water quality stability, improving the aquaculture effect, and realizing the efficient utilization of resources and the environment-friendly aquaculture mode.

[0013] A further setting of the present invention is that: a quick drainage pipe is also provided between the outlet pipe and the water level control connection pipe, and a quick drainage electric valve is provided on the quick drainage pipe.

[0014] By adopting the above technical solution, the quick-drain pipes are used to intermittently achieve rapid water exchange in the aquaculture pond, enabling the rapid discharge of particulate matters such as residual baits and feces in the aquaculture pond, ensuring that particulate matters such as residual baits and feces in the pond do not have time to undergo biochemical reactions on the pond wall. Therefore, the cleanliness of the aquaculture pond wall can be ensured, the water quality in the aquaculture system can be kept stable for a long time, the accumulation of harmful substances can be avoided, the growth of bacteria can be reduced, the disease risk can be lowered, the aquaculture environment can be continuously maintained healthy, the survival rate of aquaculture organisms can be increased, and the efficient and environmentally friendly aquaculture goal can be achieved.

[0015] A further setting of the present invention is: it further includes an original water pond, the original water pond is communicated with the water replenishment port of the biological filter tank through a water replenishment pipe, upper and lower water level sensors are arranged at the water replenishment ports of the reservoir and the biological filter tank, an electric valve is further installed at the water replenishment port, and each upper and lower water level sensor, the circulation pump and the electric valve are electrically connected to the controller.

[0016] By adopting the above technical solution, the original water pond is used to inject water into the biological filter tank through the water replenishment pipe after the water level in the biological filter tank drops, ensuring timely water replenishment for the biological filter tank, maintaining the normal operation of the biological filter tank, guaranteeing the water quality purification effect, avoiding the reduction of filtration efficiency caused by the water level drop, ensuring the stability of the aquaculture water quality, further enhancing the reliability and environmental friendliness of the overall aquaculture system. The upper and lower sensors are used to monitor the water levels of the reservoir and the biological filter tank in real time. The controller automatically adjusts the opening and closing of the circulation pump and the electric valve according to the real-time data of the upper and lower sensors, realizing precise water replenishment and drainage, ensuring the efficient operation of the system, and effectively improving the intelligent level of the system's water quality management.

[0017] A further setting of the present invention is: the reservoir, the aquaculture pond, the original water pond and the sewage pond all include a pond body composed of galvanized plates, the biological filter tank is a pond body formed by an earth pit, and a waterproof layer composed of canvas is laid in each pond body.

[0018] By adopting the above technical solution, the reservoir, the aquaculture pond, the original water pond and the sewage pond adopt pond bodies composed of galvanized plates. Galvanized plates have good corrosion resistance and strength, ensuring the firm and durable structure of each pond body, extending the service life, reducing the maintenance cost, and being convenient for installation and disassembly, further enhancing the overall stability and economy of the system. The biological filter tank adopts an earth pit pond body, which can be flexibly designed according to the terrain, adapting to different aquaculture scales and requirements. Moreover, the earth pit structure has good heat preservation performance, which helps to maintain an appropriate water temperature, promote the activity of microorganisms, and improve the water quality purification efficiency. The waterproof layer composed of canvas laid inside each pond body has a soft texture and excellent waterproof performance, effectively preventing the pond body from leaking, keeping the water quality pure. At the same time, the canvas has a low cost, is easy to obtain, and is also convenient for cleaning and replacement, further enhancing the convenience and economy of pond body maintenance, and ensuring the long-term stability and efficient operation of the aquaculture environment.

[0019] A further setting of the present invention is that the biological filter is in an inverted frustum structure, the biological filter is arranged below the ground level, multiple sets of biological filler compartments with a horizontal and vertical structure are arranged in the biological filter, the biological filler is evenly placed into each biological filler compartment, and multiple aeration pipes are evenly laid below the biological filler compartments, and each of the aeration pipes is communicated with an aeration blower.

[0020] By adopting the above technical solution, the inverted frustum structure of the biological filter can make full use of the underground space, reduce the ground occupation, be suitable for areas with limited land resources, and at the same time can effectively utilize the heat preservation performance of the underground environment, reduce the water temperature fluctuation, evenly distribute the biological filler into each compartment, and the design of the horizontal and vertical compartments can effectively prevent the filler from being washed to the pool edge and causing accumulation or uneven distribution due to aeration and other reasons, resulting in uneven distribution of the microbial population in the water body and affecting biochemical treatment and other problems, effectively improving the biological degradation efficiency, ensuring the maximization of the microbial contact area in each compartment, and enhancing the degradation effect of organic matter and pollutants.

[0021] A further setting of the present invention is that the side walls and the bottom of the biological filler compartment are both mesh-like partitions, and the diameter of the mesh holes on the partitions is smaller than the diameter of the biological filler.

[0022] By adopting the above technical solution, the mesh-like partition can not only effectively isolate the filler, make it evenly distributed, and prevent the overflow of the biological filler, but also does not affect its tumbling process under the action of aeration, ensure uniform aeration, promote the microbial activity, improve the water quality purification efficiency, reduce the energy consumption at the same time, optimize the operation cost of the system, and further enhance the stability and sustainability of the overall aquaculture environment.

[0023] A further setting of the present invention is that the positions and heights of the reservoir, the aquaculture pond, the water level controller, the microfilter and the biological filter are arranged in a stepped manner from high to low. An overflow pipe is also arranged in the biological filter, the overflow pipe is connected with the reservoir, the position of the microfilter is higher than that of the sewage pond, and the position of the raw water pond is higher than that of the biological filter.

[0024] By adopting the above technical solution, using the stepped arrangement design, the water flow flows step by step from high to low during the circulation process, which not only reduces the water flow resistance, improves the circulation efficiency, ensures the water quality balance of each pond, avoids local pollution, but also is beneficial to reducing the number of circulation pumps used in the system and the overflow risk of each component, and ensures the safe operation of the system.

[0025] A further setting of the present invention is that the bottom surface of the aquaculture pond is a conical surface, the water outlet of the aquaculture pond is arranged at the center of the bottom of its conical surface, and an annular aeration nanotube connected to an aeration blower is arranged at the bottom of the aquaculture pond, and the annular aeration nanotube is fixed at the connection of the side wall and the bottom wall of the aquaculture pond.

[0026] By adopting the above technical solution, the bottom of the aquaculture pond is conical and the water outlet is arranged at the center of the bottom of the conical surface, so that dirt and residual bait can naturally gather at the central water outlet at the bottom, which is convenient for centralized discharge, reduces bottom sedimentation, ensures thorough sewage discharge, avoids dead corner residues. After the annular aeration nanotube is fixed at the connection of the side wall and the bottom wall, the airflow formed by the release of oxygen in the annular aeration nanotube near the vertical wall can further clean the pool wall, prevent algae attachment, keep the pool wall smooth, reduce bacteria breeding, and at the same time, the formed airflow can effectively promote water circulation, enhance oxygen dissolution, improve water quality, ensure uniform oxygen distribution, and avoid local hypoxia phenomenon.

[0027] A cultivation method for an industrialized recirculating aquaculture system, comprising the following steps:

[0028] S1: Culturing the biological filter bacteria group: First, inject the water body for bacteria cultivation into the biological filter, and then, according to the cultured fish and density of each aquaculture unit, add microorganisms (nitrifying bacteria) to the biological filter in proportion or directly add biological fillers attached with microorganisms, nutrient substrates of microorganisms or new biological fillers, and start the aeration blower to aerate the water body in the biological filter, and culture at a temperature suitable for the growth of the bacteria group until the bacteria cultivation is completed. During this period, reasonably add microorganisms, nutrient substrates of microorganisms to the pool, and observe the bacteria group growing on the biological filler;

[0029] S2: Injecting the aquaculture water body into the aquaculture pond and replenishing water to the biological filter at the same time: After the bacteria group on the biological filler in the biological filter is cultured, start the circulation pump, microfilter and aeration blower. After the circulation pump pumps the water body from the biological filter into the reservoir, the water level in the biological filter will drop. At this time, the original water tank automatically replenishes water to the biological filter through the electric valve to ensure the stable water level in the biological filter. At the same time, open the water inlet pipe of the aquaculture pond for the fry to be cultured and inject the aquaculture water body into the aquaculture pond;

[0030] S3: Releasing fry into the aquaculture pond: The release quantity of the fry depends on the maximum aquaculture density of each aquaculture unit when the fry grows to adult fish;

[0031] S4: Automatic purification and circulation of the water body: The water body in the biological filter is intermittently pumped into the reservoir by the circulation pump. Under the action of gravity, the water body in the reservoir will automatically enter the aquaculture pond through the aquaculture pond water inlet. When the water surface in the aquaculture pond is higher than the overflow port or the quick-discharge electric valve is opened, it will flow into the microfilter through the water level controller for purification and then flow into the biological filter;

[0032] S5: During the aquaculture process, the water volume lost due to the removal of suspended particles by the microfilter is automatically supplemented from the water body in the original water tank to the biological filter through the water replenishing valve;

[0033] S6: During the breeding process, water quality parameters such as water temperature, pH, dissolved oxygen, ammonia nitrogen, nitrite, nitrate, etc. in the breeding water body are monitored daily.

[0034] The beneficial effects of the present invention are as follows:

[0035] 1. In the present invention, the water body in the breeding ponds of each breeding unit flows into the microfilter through the independent outlet pipes at the bottom for primary filtration, so that suspended particles such as residual baits and feces in the water body are effectively removed (discharged into the sewage pond). Each breeding pond uses the relatively large pressure of the water body when draining at the bottom to quickly press the particles such as residual baits and feces in the water body into the microfilter, greatly improving the removal efficiency of suspended particles in the breeding pond water body. Moreover, there is no need to additionally set up high-cost precipitation devices, greatly reducing the equipment investment and maintenance costs. The clear water after primary filtration by the microfilter then enters the biological filter for biodegradation to remove harmful substances such as ammonia nitrogen and nitrite in the water body, further improving the water quality. The water purified by biodegradation is pumped back to the reservoir through the circulation pump, and then re-injected into the breeding pond through the inlet pipe at the bottom of the reservoir, forming an efficient circulating water system to ensure that the water quality in the breeding pond always remains stable. In the whole process, each unit operates in coordination to jointly achieve the balance of water body circulation, not only with small water resource loss, low energy consumption, but also high breeding efficiency.

[0036] 2. The present invention uses the water level and control mechanism to real-time control the water level in the breeding pond. When the water level in the breeding pond is higher than the overflow outlet of the overflow pipe in the water level control mechanism, the excess water body automatically enters the overflow pipe through the outlet pipe at its bottom and is discharged from the overflow outlet of the overflow pipe into the water level controller, and then is discharged from the drain outlet at the bottom of the water level controller into the circulation pipeline, and finally is discharged into the microfilter through the circulation pipeline. The water outlet height of the overflow outlet matches the set water level height in the breeding pond to ensure the stability of the breeding pond water level and prevent the water body in the breeding pond from overflowing due to being too full. The setting of the unplugging pipe at the overflow outlet is used to adjust the drainage height of the overflow outlet. By changing the insertion depth of the unplugging pipe, the water level of the breeding pond can be flexibly controlled. The control process is simple, the operation is convenient, and there is no need for additional equipment investment, further optimizing the system operation efficiency, ensuring the water quality stability, improving the breeding effect, and realizing the efficient utilization of resources and the environment-friendly breeding mode.

[0037] 3. In the present invention, the quick-drain pipe is used to intermittently realize the rapid exchange of the water body in the breeding pond, so that the particles such as residual baits and feces in the breeding pond are quickly discharged, ensuring that the particles such as residual baits and feces in the pond do not have time to undergo biochemical reactions on the pond wall. Therefore, the cleanliness of the breeding pond wall can be ensured to ensure the long-term stability of the water quality in the breeding system, avoid the accumulation of harmful substances, reduce the growth of bacteria at the same time, reduce the disease risk, ensure the continuous health of the breeding environment, improve the survival rate of breeding organisms, and achieve the breeding goals of high efficiency and environmental protection.

[0038] 4. In the present invention, the original water tank is used to inject water into the biological filter tank through the water supply pipe after the water level in the biological filter tank drops, ensuring timely water replenishment for the biological filter tank, maintaining the normal operation of the biological filter tank, guaranteeing the water purification effect, avoiding the reduction of filtration efficiency caused by the water level drop, ensuring the stability of the aquaculture water quality, and further enhancing the reliability and environmental friendliness of the overall aquaculture system. The upper and lower sensors are used to monitor the water levels of the reservoir and the biological filter tank in real time. The controller automatically adjusts the opening and closing of the circulation pump and the electric valve according to the real-time data of the upper and lower sensors, realizing precise water replenishment and drainage, ensuring the efficient operation of the system, and effectively improving the intelligent level of the system's water quality management.

[0039] 5. In the present invention, the reservoir, the aquaculture pond, the original water tank and the sewage tank are composed of galvanized sheets to form the tank body. The galvanized sheet has good corrosion resistance and strength, ensuring the structural stability and durability of each tank body, extending the service life, reducing the maintenance cost, and being convenient for installation and disassembly, further enhancing the overall stability and economy of the system. The biological filter tank adopts an earthen pit tank body, which can be flexibly designed according to the terrain, adapting to different aquaculture scales and requirements. Moreover, the earthen pit structure has good heat preservation performance, which helps to maintain an appropriate water temperature, promote the activity of microorganisms, and improve the water purification efficiency. The waterproof layer composed of canvas is laid inside each tank body. The canvas material is soft and has excellent waterproof performance, effectively preventing the leakage of the tank body, keeping the water quality pure. At the same time, the canvas has a low cost, is easy to obtain, and is also convenient for cleaning and replacement, further enhancing the convenience and economy of the tank body maintenance, and ensuring the long-term stability and efficient operation of the aquaculture environment.

[0040] 6. In the present invention, the biological filter tank adopts an inverted convex platform structure, which can make full use of the underground space, reduce the ground occupation, be suitable for areas with limited land resources. At the same time, it can also effectively utilize the heat preservation performance of the underground environment, reduce the water temperature fluctuation, evenly distribute the biological fillers to each compartment. The design of the horizontal and vertical partitions can effectively prevent the fillers from being washed to the pool edge and causing accumulation or uneven distribution due to reasons such as aeration, resulting in uneven distribution of the microbial population in the water body and affecting biochemical treatment and other problems, effectively improving the biological degradation efficiency, ensuring the maximization of the microbial contact area in each compartment, and enhancing the degradation effect of organic matter and pollutants.

[0041] 7. In the present invention, the side walls and the bottom of the biological filler compartment adopt mesh-like partitions, which can not only effectively isolate the fillers, make them evenly distributed, and prevent the overflow of biological fillers, but also, without affecting their tumbling process under the action of aeration, ensure uniform aeration, promote the activity of microorganisms, improve the water purification efficiency, reduce the energy consumption at the same time, optimize the operation cost of the system, and further enhance the stability and sustainability of the overall aquaculture environment.

[0042] 8. In the present invention, the reservoir, the aquaculture pond, the water level controller, the microfilter, and the biological filter are arranged in a stepped manner according to the height from high to low, so that the water flow flows step by step from high to low during the circulation process. This not only reduces the water flow resistance, improves the circulation efficiency, ensures the water quality balance of each pond, and avoids local pollution, but also helps to reduce the number of circulation pumps used in the system and the overflow risk of each component, ensuring the safe operation of the system.

[0043] 9. The bottom of the aquaculture pond in the present invention is conical and the water outlet is arranged at the center of the bottom of the conical surface, so that dirt and residual bait can naturally gather at the central water outlet at the bottom, facilitating centralized discharge, reducing bottom sedimentation, ensuring thorough sewage discharge, avoiding dead corner residues. After the annular aeration nanotubes are fixed at the connection of the side wall and the bottom wall, the airflow formed by the release of oxygen in the annular aeration nanotubes near the vertical wall can further clean the pool wall, prevent algae attachment, keep the pool wall smooth, reduce bacteria breeding, and at the same time, the formed airflow can effectively promote water circulation, enhance oxygen dissolution, improve water quality, ensure uniform oxygen distribution, and avoid local hypoxia. Brief Description of the Drawings

[0044] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0045] Figure 1 It is a schematic diagram of the overall structure of an industrialized recirculating aquaculture system for aquaculture according to the present invention.

[0046] Figure 2 It is a schematic diagram of the connection structure between the aquaculture pond and the water level control mechanism in a breeding unit of an industrialized recirculating aquaculture system for aquaculture according to the present invention.

[0047] Figure 3 is Figure 2 The partial enlarged schematic diagram of A in

[0048] Figure 4 It is a schematic cross-sectional view of the water body flow direction in the aquaculture pond when the quick-discharge electric valve is opened in an industrialized recirculating aquaculture system for aquaculture according to the present invention

[0049] In the figure, 1 is a breeding pond; 2 is a biological filter; 3 is a microfilter; 4 is a sewage discharge pond; 4 is a water storage pond; 6 is an outlet pipe; 7 is a circulation pump; 8 is a water level controller; 9 is an overflow pipe; 10 is an overflow port; 11 is a water level control connecting pipe; 12 is a circulation pipeline; 13 is a quick discharge pipe; 14 is a quick discharge electric valve; 15 is a biological filler compartment; 16 is an annular aeration nanotube; 17 is a water level regulating pipe; 18 is an original water pond. Detailed implementation mode

[0050] The technical solution of the present invention will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative work belong to the scope of protection of the present invention.

[0051] As Figures 1 to 4 shown, an industrialized circulating water aquaculture system for aquaculture includes one or more aquaculture units, a biological filtration unit and a water circulation filtration unit. Each of the aquaculture units includes at least one independent breeding pond 1. The biological filtration unit includes a biological filter 2 with built-in biological fillers. The water circulation filtration unit includes a microfilter 3, a sewage discharge pond 4 and a water storage pond 5. The breeding pond 1 in each aquaculture unit is communicated with the water inlet of the microfilter 3 through an independent outlet pipe 6 provided at the bottom. The drain outlet of the microfilter 3 is communicated with the water inlet of the biological filter 2 through a drain pipe 6. The sewage discharge port of the microfilter 3 is communicated with the sewage discharge pond 4. The biological filter 2 is communicated with the water inlet pipe of the water storage pond 5 through a circulation pump 7. The bottom of the water storage pond 5 is communicated with the breeding pond 1 through the water inlet pipe of the breeding pond 1.

[0052] Further, a water level control mechanism is provided between the outlet pipe 6 and the water inlet of the microfilter 3. The water level control mechanism includes a water level controller 8 and an overflow pipe 9. The upper end of the overflow pipe 9 is provided with an overflow port 10. A water level regulating pipe 17 is inserted into the overflow port 10. The lower end of the overflow pipe 9 is communicated with the outlet pipe 6. The drain outlet of the water level controller 8 is communicated with the circulation pipeline 12 through a water level control connecting pipe 11. The circulation pipeline 12 is communicated with the water inlet of the microfilter 3.

[0053] Further, a quick discharge pipe 13 is also provided between the outlet pipe 6 and the water level control connecting pipe 11. A quick discharge electric valve 14 is provided on the quick discharge pipe 13.

[0054] Further, it also includes an original water tank 18, and the original water tank 18 is communicated with the water replenishing port of the biological filter tank 2 through a water replenishing pipe 15. Upper and lower water level sensors are arranged at the water replenishing ports of the water storage tank 5 and the biological filter tank 2, and an electric valve is also installed at the water replenishing port. Each upper and lower water level sensor, the circulation pump 7 and the electric valve are electrically connected to the controller.

[0055] Further, the water storage tank 5, the aquaculture pond 1, the original water tank 18 and the sewage tank 4 all include a tank body composed of galvanized sheets, and the biological filter tank 2 is a tank body formed by an earth pit. A waterproof layer composed of canvas is laid in each tank body.

[0056] Further, the biological filter tank 2 is of an inverted convex platform structure. The biological filter tank 2 is arranged below the ground height. Multiple groups of biological filler compartments 15 with horizontal and vertical structures are arranged in the biological filter tank 2. The biological fillers are evenly put into each biological filler compartment 15. Multiple aeration pipes are evenly laid below the biological filler compartments 15, and each aeration pipe is communicated with an aeration blower.

[0057] Further, the side wall and the bottom of the biological filler compartment 15 are both mesh-like partitions, and the diameter of the mesh holes on the partitions is smaller than the diameter of the biological fillers.

[0058] Further, the positions and heights of the water storage tank 5, the aquaculture pond 1, the water level controller 8, the microfilter 3 and the biological filter tank 2 are arranged in a stepped manner from high to low. An overflow pipe is also arranged in the biological filter tank 2, and the overflow pipe is connected to the water storage tank 5. The position of the microfilter 3 is higher than that of the sewage tank 4, and the position of the original water tank 18 is higher than that of the biological filter tank 2.

[0059] Further, the bottom surface of the aquaculture pond 1 is a conical surface, the water outlet of the aquaculture pond 1 is arranged at the center of the bottom of its conical surface, and an annular aeration nanotube 16 connected to an aeration blower is arranged at the bottom of the aquaculture pond 1. The annular aeration nanotube 16 is fixed at the connection of the side wall and the bottom wall of the aquaculture pond 1.

[0060] A breeding method for an industrialized recirculating aquaculture system includes the following steps:

[0061] S1: Culturing the bacteria group in the biological filter tank 2: First, inject the water body for culturing bacteria into the biological filter tank 2, and then, according to the cultured fish and density of each aquaculture unit, add nitrifying bacteria or directly add biological fillers with attached microorganisms, nutrient substrates of microorganisms or new biological fillers to the biological filter tank 2 in proportion, and start the aeration blower to aerate the water body in the biological filter tank 2, and culture at a temperature suitable for the growth of the bacteria group until the bacteria culturing is completed. During this period, reasonably add microorganisms and nutrient substrates of microorganisms to the tank, and observe the bacteria group growing on the biological fillers.

[0062] S2: Inject the aquaculture water into the aquaculture pond 1 and replenish water to the biological filter tank 2 at the same time: After the bacterial community on the biological packing in the biological filter tank 2 is cultured, start the circulation pump 7, the microfilter 3 and the aeration blower. When the circulation pump 7 pumps the water from the biological filter tank 2 into the reservoir 5, the water level in the biological filter tank 2 will drop. At this time, the water in the original water tank 18 will automatically replenish the biological filter tank 2 through the electric valve to ensure the stable water level in the biological filter tank 2. At the same time, open the water inlet pipe of the aquaculture pond 1 for the fry to be cultured and inject the aquaculture water into the aquaculture pond 1;

[0063] S3: Release fry into the aquaculture pond 1: The number of fry released depends on the maximum aquaculture density of each aquaculture unit when the fry grow into adult fish;

[0064] S4: Automatic water purification and circulation: The water in the biological filter tank 2 is intermittently pumped into the reservoir 5 by the circulation pump 7. Under the action of gravity, the water in the reservoir 5 will automatically enter the aquaculture pond 1 through the water inlet of the aquaculture pond 1. When the water surface in the aquaculture pond 1 is higher than the overflow port or the quick-discharge electric valve is opened, the water will flow into the microfilter 3 through the water level controller 8 for purification and then flow into the biological filter tank 2;

[0065] S5: During the aquaculture process, the water volume lost due to the removal of suspended particles by the microfilter 3 is automatically supplemented from the water in the original water tank 18 to the biological filter tank 2 through the water replenishment valve;

[0066] S6: During the aquaculture process, monitor the water quality parameters such as water temperature, pH, dissolved oxygen, ammonia nitrogen, nitrite, nitrate, etc. in the aquaculture water every day.

Claims

1. A factory-scale circulating water culture system for aquaculture, characterized by: The invention comprises one or more breeding units, biological filtration units and water circulation filtration units, each of the breeding units comprises at least one independent breeding pool (1), the biological filtration unit comprises a biological filter (2) with built-in biological filler, the water circulation filtration unit comprises a microfilter (3), a sewage tank (4) and a water storage tank (5), the breeding pool (1) in each of the breeding units is connected to the water inlet of the microfilter (3) through an independent water outlet pipe (6) arranged at the bottom, the drainage port of the microfilter (3) is connected to the water inlet of the biological filter (2) through the drainage pipe (6), the sewage outlet of the microfilter (3) is connected to the sewage tank (4), the biological filter (2) is connected to the water inlet pipe of the water storage tank (5) through a circulation pump (7), and the bottom of the water storage tank (5) is connected to the breeding pool (1) through the water inlet pipe of the breeding pool (1).

2. The factory-scale circulating water culture system for aquaculture according to claim 1, characterized in that: A water level control mechanism is provided between the water outlet pipe (6) and the water inlet of the microfilter (3), the water level control mechanism comprising a water level controller (8) and an overflow pipe (9), the upper end of the overflow pipe (9) is provided with an overflow port (10), a water level regulating pipe (17) is inserted into the overflow port (10), the lower end of the overflow pipe (9) is connected to the water outlet pipe (6), the drain port of the water level controller (8) is connected to the circulation pipe (12) through a water level control connecting pipe (11), and the circulation pipe (12) is connected to the water inlet of the microfilter (3).

3. The factory-scale circulating water culture system for aquaculture according to claim 2, characterized in that: A quick-discharge pipe (13) is also provided between the water outlet pipe (6) and the water level control connecting pipe (11), and a quick-discharge electric valve (14) is provided on the quick-discharge pipe (13).

4. The factory-scale circulating water culture system for aquaculture according to claim 1, characterized in that: The invention also comprises a raw water pool (18), wherein the raw water pool (18) is connected to the water supply port of the biological filter (2) through a water supply pipe (15), and upper and lower water level sensors are arranged at the water supply ports of the water storage pool (5) and the biological filter (2), and an electric valve is also installed at the water supply port, and each upper and lower water level sensor is electrically connected to the circulation pump (7) and the electric valve and the controller.

5. The factory-scale circulating water culture system for aquaculture according to claim 4, characterized in that: The water storage tank (5), the breeding tank (1), the raw water tank (18) and the sewage tank (4) all include a tank body composed of galvanized sheets, and the biofilter (2) has a tank body formed by an earth pit. A waterproof layer composed of canvas is laid inside each of the tank bodies.

6. The factory-scale circulating water culture system for aquaculture according to claim 5, characterized in that: The biofilter (2) is an inverted convex platform structure. The biofilter (2) is arranged below the ground level. A plurality of groups of biofiller compartments (15) with horizontal and vertical structures are arranged in the biofilter (2). The biofiller is evenly placed in each biofiller compartment (15). A plurality of aeration pipes are evenly laid below the biofiller compartment (15), and each of the aeration pipes is connected to an aeration fan.

7. The factory-scale circulating water culture system for aquaculture according to claim 6, characterized in that: The side wall and the bottom of the biological filler compartment (15) are both mesh partitions, and the diameter of the mesh on the partition is smaller than the diameter of the biological filler.

8. The factory-scale circulating water culture system for aquaculture according to claim 7, characterized in that: The water storage tank (5), the culture tank (1), the water level controller (8), the microfilter (3) and the biological filter (2) are arranged in a stepped manner from high to low. The biological filter (2) is also provided with an overflow pipe, which is connected to the water storage tank (5). The microfilter (3) is located higher than the sewage tank (4), and the raw water tank (18) is located higher than the biological filter (2).

9. The factory-scale circulating water culture system for aquaculture according to claim 1, characterized in that: The bottom surface of the culture pond (1) is a conical surface, the water outlet of the culture pond (1) is arranged at the center of the bottom of the conical surface, and the bottom of the culture pond (1) is provided with an annular oxygen-increasing nanotube (16) connected to an oxygen-increasing fan, and the annular oxygen-increasing nanotube (16) is fixed at the connection between the side wall and the bottom wall of the culture pond (1).

10. A method for aquaculture in a factory-scale circulating aquaculture system according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1: Cultivation of bacterial flora in biological filter (2): first, water for bacterial cultivation is injected into the biological filter (2), then, according to the cultured fish and density of each culture unit, microorganisms (nitrifying bacteria) are added to the biological filter (2) in proportion, or biological fillers with microorganisms attached, nutrient substrates for microorganisms, or new biological fillers are directly added, and an aeration fan is started to aerate the water in the biological filter (2), and the water is cultivated at a temperature suitable for bacterial flora growth until the bacterial cultivation is completed. During this period, microorganisms and nutrient substrates for microorganisms are reasonably added to the pool, and the bacterial flora growing on the biological fillers is observed; S2: injecting aquaculture water into the aquaculture pond (1) and replenishing water into the biofilter (2): after the bacterial flora on the biological filler in the biofilter (2) is cultivated, the circulation pump (7), the microfilter (3) and the oxygenating fan are started. After the circulation pump (7) draws water from the biofilter (2) to the reservoir (5), the water level in the biofilter (2) will drop. At this time, water is automatically replenished into the biofilter (2) from the raw water tank (18) through the electric valve to ensure that the water level in the biofilter (2) is stable. At the same time, the water inlet pipe of the aquaculture pond (1) for fry to be cultured is opened to inject aquaculture water into the aquaculture pond (1); S3: releasing fry into the culture pond (1): the number of fry released depends on the maximum culture density of each culture unit when the fry are grown into adult fish; S4: Automatic water purification cycle: The water in the biological filter (2) is intermittently pumped into the water storage tank (5) by the circulation pump (7). Under the action of gravity, the water in the water storage tank (5) automatically enters the breeding pool (1) through the water inlet of the breeding pool (1). When the water surface in the breeding pool (1) is higher than the overflow port or the quick discharge electric valve is opened, the water will flow into the microfilter (3) through the water level controller (8) for purification and then flow into the biological filter (2); S5: During the breeding process, the water lost due to the removal of suspended particles by the microfilter (3) is automatically replenished from the water in the original water tank (18) to the biofilter (2) through the water replenishment valve; S6: During the breeding process, water quality parameters such as water temperature, pH, dissolved oxygen, ammonia nitrogen, nitrite, and nitrate in the breeding water are monitored daily.

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