Multi-stage filtration device for recirculating aquaculture

Abstract

This invention relates to the field of filtration technology and discloses a multi-layered filtration device for recirculating aquaculture, comprising: a first filter box for removing large particulate impurities from the water; a second filter box for adsorbing dissolved organic matter in the water; a third filter box for deep filtration of the water; and a fourth filter box for further removing suspended particles and fine impurities. Each filter box is equipped with a collection component, and the first, third, and fourth filter boxes each contain filter components of different precision. Preferably, the filter components include filter tubes. This invention, through multi-layered filtration, intelligent monitoring, self-cleaning function, and modular design, achieves efficient water purification, intelligent system control, convenient maintenance, and stable operation. Compared to existing technologies with low filtration efficiency, delayed control, cumbersome maintenance, and structural instability, it significantly improves applicability and reliability.

Description

Technical Field

[0001] This invention relates to the field of filtration technology, specifically to a multi-layer grading filtration device for recirculating aquaculture. Background Technology

[0002] With the rapid development of the aquaculture industry, recirculating aquaculture systems have gradually become an efficient and environmentally friendly aquaculture method. Recirculating aquaculture treats and recycles aquaculture wastewater through filtration and purification systems, which not only significantly reduces water consumption but also reduces the pollution of the environment caused by water discharge.

[0003] The filtration system lacks tiered filtration and intelligent adjustment functions, making it difficult to handle complex water qualities; cleaning methods mainly rely on manual disassembly, which is cumbersome and affects continuous operation; the system has poor operational stability, uneven water flow distribution, and insufficient modular design, making it difficult to adapt to different scale requirements; sterilization technology relies heavily on chemical agents, which can easily cause secondary pollution. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a multi-layer graded filtration device for recirculating aquaculture, which solves the problems of filtration systems lacking graded filtration and intelligent adjustment, requiring manual disassembly for cleaning and being cumbersome to maintain; poor operational stability, uneven water flow distribution, insufficient modular design; and reliance on chemical agents for sterilization, which can easily lead to secondary pollution.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a multi-layer graded filtration device for recirculating aquaculture, comprising:

[0006] Filter box one is used to remove large particulate impurities from water.

[0007] Filter box two is used to adsorb dissolved organic matter in the water;

[0008] Filter box three is used for deep filtration of water.

[0009] Filter box four is used to further remove suspended particles and fine impurities;

[0010] Each of the filter boxes is equipped with a data collection component, and filter boxes one, three, and four are each equipped with filter components of different precision.

[0011] Preferably, the filter assembly includes filter tubes, which are equidistantly arranged inside filter box one, filter box three, and filter box four. Each filter tube is equipped with a filter screen, which is a coarse filter screen, a medium filter screen, and a fine filter screen. The coarse filter screen, the medium filter screen, and the fine filter screen are respectively arranged inside filter box one, filter box three, and filter box four. Each filter tube has a drain hole equidistantly opened on its exterior. Filter box one is equipped with multiple water inlet flanges on its exterior. The inner top wall of filter box one is equipped with a baffle plate.

[0012] Preferably, the interior of the filter box 2 is provided with a biological filtration layer and an activated carbon layer, and multiple outlet flanges 2 are equidistantly arranged on the rear side of the filter box 2.

[0013] Preferably, the data acquisition components include a dissolved oxygen sensor, a pH sensor, an ammonia nitrogen sensor, and a turbidity sensor. The dissolved oxygen sensor, pH sensor, ammonia nitrogen sensor, and turbidity sensor are all installed on the inner walls of filter boxes one, two, three, and four, and are arranged at certain intervals. The dissolved oxygen sensor, pH sensor, ammonia nitrogen sensor, and turbidity sensor transmit the acquired data to the central control system.

[0014] Preferably, each of the filter boxes 1, 3, and 4 is equipped with a baffle 2 inside. A sandwich structure is provided between the baffle 2 and the inner walls of each filter box. Each filter pipe is connected to a water supply pipe via a pipe. The water supply pipes are connected to the output end of a high-pressure pump via pipes, and the high-pressure pump is located on the outside of filter box 2. An electronic valve 1 is installed on the outside of each water supply pipe. The outside of each of the filter boxes 1, 3, and 4 is connected to the inlet of a sedimentation tank via a drain pipe. The sedimentation tank is located on the outside of filter box 2. An outlet flange 1 is installed on the outside of the sedimentation tank. Each connecting pipe of the drain pipe is equipped with an electronic valve 2.

[0015] Preferably, the tops of filter boxes two, three, and four are provided with multiple mounting holes at equal intervals. The inner side of each mounting hole is provided with an annular groove, and a rubber ring is provided on the inner side of the annular groove. The lower end of each filter tube is engaged with the mounting hole, and the outer diameter of the filter tube is in contact with the rubber ring. The outer diameter of the rubber ring is larger than the inner diameter of the annular groove.

[0016] Preferably, multiple water pumps are equidistantly arranged on the top of the filter box one, and each water pump is equipped with an electronic valve one at its output end. Multiple ultraviolet sterilizers are equidistantly arranged on the rear side of the filter box three. The inlet of the ultraviolet sterilizer is connected to the outlet flange two, and the outlet of the ultraviolet sterilizer is connected to the input end of the water pump through a pipe.

[0017] Preferably, L-shaped fixing plates are provided at the four outer corners of filter box one, and L-shaped fixing plates one and two are provided at equal intervals at the four outer corners of filter box three and filter box four. L-shaped fixing plates one is provided at the four outer corners of filter box two, and L-shaped fixing plates one and two are connected by bolts.

[0018] Preferably, the bottom four corners of the filter box and the sedimentation box are provided with support legs, and the support legs are evenly distributed.

[0019] Preferably, the central control system includes:

[0020] Monitoring module: It is used to transmit the data collected by the dissolved oxygen sensor, pH sensor, ammonia nitrogen sensor and turbidity sensor to the central control system;

[0021] Analysis module: This module analyzes the data collected from the central control system through a data processing unit. This invention provides a multi-layer, graded filtration device for recirculating aquaculture. It has the following beneficial effects:

[0022] 1. This invention employs a four-stage filtration system consisting of filter box one, filter box two, filter box three, and filter box four. Through multi-layered treatment including coarse filtration, medium filtration, biological and chemical adsorption, and fine filtration, it achieves the gradual removal of large particles and even tiny particles from water, resulting in highly efficient water purification. Compared to the low efficiency of single filtration methods in existing technologies, this invention overcomes the shortcomings of insufficient capacity for treating complex water pollution.

[0023] 2. This invention, by incorporating dissolved oxygen, pH, ammonia nitrogen, and turbidity sensors, along with monitoring and analysis modules in a central control system, achieves real-time acquisition and analysis of water quality parameters and automatically adjusts the operating status of the filtration system, thus realizing intelligent water quality monitoring and efficient system operation. Compared to the lag in response of manual monitoring and adjustment in existing technologies, this invention solves the defects of low efficiency and insufficient accuracy in water quality control.

[0024] 3. This invention achieves efficient backwashing of the filter pipes and screens through a reverse water flow provided by a high-pressure pump, and centrally treats the cleaning wastewater through a drain pipe and sedimentation tank, achieving a highly efficient self-cleaning effect. Compared to the problem of frequent disassembly and cleaning of filter devices in existing technologies, this invention solves the defects of complex maintenance and low operating efficiency.

[0025] 4. This invention isolates the water supply pipeline from interference by setting up a baffle, disinfects and sterilizes the water with an ultraviolet sterilizer, and ensures the structural stability of the equipment by using an L-shaped fixing plate and support legs. At the same time, the modular design makes the installation, disassembly and maintenance of the filter box more convenient, improving the system's flexibility and adaptability. It achieves the technical effect of stable, safe and reliable system operation and easy maintenance. Compared with the problems of unstable equipment structure, low functional integration and complex maintenance in the prior art, it solves the defects of unreliable operation, limited scope of application and low maintenance efficiency. Attached Figure Description

[0026] Figure 1 This is an overall perspective view of the present invention;

[0027] Figure 2 This is a rear view diagram of the present invention;

[0028] Figure 3 This is a front view diagram of the unfolded state of the present invention;

[0029] Figure 4 This is a schematic diagram of the invention from the right side when unfolded;

[0030] Figure 5 This is a partial cross-sectional view of the present invention;

[0031] Figure 6 For the present invention Figure 5 Enlarged view of point A in the middle;

[0032] Figure 7 For the present invention Figure 1 Cross-sectional schematic diagram of the middle filter box;

[0033] Figure 8 For the present invention Figure 1 Cross-sectional view of the second filter box;

[0034] Figure 9 This is a flowchart of the central control system of the present invention.

[0035] The components are as follows: 1. Filter box one; 2. Filter box two; 3. Filter box three; 4. Filter box four; 5. L-fixed plate one; 6. L-fixed plate two; 7. Outlet flange one; 8. Sedimentation tank; 9. High-pressure pump; 10. Ultraviolet sterilizer; 11. Support leg; 12. Inlet flange; 13. Suction pump; 14. Electronic valve one; 15. Electronic valve two; 16. Outlet flange two; 17. Filter pipe; 18. Annular groove; 19. Mounting hole; 20. Rubber ring; 21. Filter screen; 22. Drain hole; 23. Dissolved oxygen sensor; 24. pH sensor; 25. Ammonia nitrogen sensor; 26. Turbidity sensor; 27. Baffle one; 28. Biological filter layer; 29. ​​Activated carbon layer; 30. Water supply pipe; 31. Baffle two; 32. Drain pipe. Detailed Implementation

[0036] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0037] Please see the appendix Figure 1 -Appendix Figure 6 This invention provides a multi-layer tiered filtration device for recirculating aquaculture, comprising:

[0038] Filter box 1 is used to remove large particulate impurities from the water; filter box 4 is used to further remove suspended particles and fine impurities; filter box 3 is used for deep filtration of the water.

[0039] Filter box 1 is used for coarse filtration of the water, reducing the initial pollution load by removing large particulate impurities, thus providing a good foundation for subsequent filtration. Filter box 4 is used to further remove suspended particles and fine impurities, using a fine filter screen 21 to finely filter residual pollutants in the water, ensuring high water transparency. Filter box 3 is used for deep filtration of the water, using a medium filter screen 21 to further remove suspended particles, while also balancing the water quality to ensure the stability of the overall filtration efficiency. Filter box 2 is used to adsorb dissolved organic matter in the water. Through the combined action of an internal biological filter layer 28 and an activated carbon layer 29, it adsorbs dissolved harmful chemicals in the water and decomposes harmful substances such as ammonia nitrogen through nitrifying bacteria, further improving the safety of the water quality. The purified water is discharged through outlet flange 216.

[0040] Each of the filter boxes 1, 3, and 4 is equipped with a baffle 31. A sandwich is provided between the baffle 31 and the inner wall of each of the filter boxes 1, 2, 3, and 4. The filter pipes 17 are connected to the water supply pipes 30 through pipes. The water supply pipes 30 are connected to the output end of the high-pressure pump 9 through pipes. The high-pressure pump 9 is located on the outside of the filter box 2. An electronic valve 14 is provided on the outside of each water supply pipe 30. The outside of each of the filter boxes 1, 3, and 4 is connected to the inlet of the sedimentation tank 8 through a drain pipe 32. The sedimentation tank 8 is located on the outside of the filter box 2. An outlet flange 7 is provided on the outside of the sedimentation tank 8. An electronic valve 15 is provided on each connecting pipe of the drain pipe 32.

[0041] Each of the filter boxes 1, 3, and 4 is equipped with a baffle 31. The baffle 31 isolates the pipe section connected to the water supply pipe 30, preventing water flow from interfering with the normal operation of the filtration area, thereby optimizing water flow distribution and improving filtration efficiency. A sandwich layer is provided between the baffle 31 and the inner walls of each of the filter boxes. This sandwich layer helps stabilize the installation environment of the filter pipe 17 and reduces the impact of water flow vibration on equipment operation during filtration. The filter pipe 17 is connected to the water supply pipe 30 via a pipe. The water supply pipe 30 provides a stable path for water flow between different filter boxes, thus ensuring the water circulation efficiency of the entire system. The filter boxes are connected to the output of the high-pressure pump 9 via pipes. The high-pressure pump 9 provides stable and sufficient water pressure to support the smooth operation of the filtration and backwashing process. It is located on the outside of the filter box 2 for easy maintenance and operation. The outside of the filter boxes 1, 3, and 4 are all connected to the inlet of the sedimentation tank 8 via drain pipes 32. The drain pipes 32 are responsible for transporting the backwash wastewater and impurities accumulated during the filtration process to the sedimentation tank 8 to prevent secondary pollution to the main circulating water. The sedimentation tank 8 is located on the outside of the filter box 2. Solid impurities are removed inside the tank through physical sedimentation. The settled water is discharged through the outlet flange 7, thereby ensuring the centralized treatment and reuse of the backwash water.

[0042] The tops of filter boxes 2, 3 and 4 are all provided with multiple mounting holes 19 at equal intervals. The inner side of each mounting hole 19 is provided with an annular groove 18. A rubber ring 20 is provided on the inner side of the annular groove 18. The lower end of the filter tube 17 is engaged with the mounting hole 19, and the outer diameter of the filter tube 17 is in contact with the rubber ring 20. The outer diameter of the rubber ring 20 is larger than the inner diameter of the annular groove 18.

[0043] Multiple mounting holes 19 are equidistantly provided on the top of filter boxes 2, 3, and 4. The presence of mounting holes 19 facilitates the installation and replacement of filter tubes 17, thereby improving the ease of maintenance of the device. Annular grooves 18 are provided on the inner side of each mounting hole 19. The annular grooves 18 are used to fix rubber rings 20. The outer diameter of the rubber rings 20 is larger than the inner diameter of the annular grooves 18, which provides a sealing effect for the filter tubes 17, preventing water leakage and ensuring the airtightness of the system.

[0044] Multiple water pumps 13 are equidistantly arranged on the top of filter box 1. Each water pump 13 is equipped with an electronic valve 14 at its output end. Multiple ultraviolet sterilizers 10 are equidistantly arranged on the rear side of filter box 3. The inlet of the ultraviolet sterilizer 10 is connected to the outlet flange 2 16, and the outlet of the ultraviolet sterilizer 10 is connected to the input end of the water pump 13 through a pipe.

[0045] Multiple water pumps 13 are equidistantly arranged on the top of filter box 1. The function of the water pumps 13 is to provide power to the filtration system, driving the water flow along a predetermined path and achieving circulation. Each water pump 13 has an electronic valve 14 at its output end. The electronic valve 14 can adjust the water flow according to the instructions of the central control system, further optimizing water flow efficiency and ensuring intelligent system operation. Multiple ultraviolet sterilizers 10 are equidistantly arranged at the rear of filter box 3. The function of the ultraviolet sterilizers 10 is to use ultraviolet light to kill pathogenic microorganisms and algae in the water, thereby ensuring water safety. The inlet of the ultraviolet sterilizer 10 is connected to the outlet flange 16, which is responsible for conveying the water treated by filter box 2 into the ultraviolet sterilizer 10 for sterilization. The outlet of the ultraviolet sterilizer 10 is connected to the input end of the water pump 13 through a pipe, thus completing the return of the sterilized water to the circulation system.

[0046] The four outer corners of filter box 1 are provided with L-fixed plate 2 6. The four outer corners of filter box 3 and filter box 4 are provided with L-fixed plate 1 5 and L-fixed plate 2 6 at equal intervals. The four outer corners of filter box 2 are provided with L-fixed plate 1 5. L-fixed plate 1 5 and L-fixed plate 2 6 are connected by bolts.

[0047] Filter box 1 has L-fixed plates 2 and 6 installed at its four outer corners. Filter boxes 3 and 4 have L-fixed plates 1 and 2 and 6 installed at equal intervals at their four outer corners. Filter box 2 has L-fixed plates 1 and 5 installed at its four outer corners. L-fixed plates 1 and 2 and 6 are connected by bolts. The bolts provide a stable mechanical connection, thereby ensuring the structural stability of the device during operation.

[0048] Both the filter box 2 and the sedimentation box 8 are equipped with support legs 11 at the four corners of their bottoms, and the support legs 11 are evenly distributed.

[0049] Both the filter box 2 and the sedimentation box 8 are equipped with support legs 11 at the four corners of their bottoms. The support legs 11 provide a reliable support structure for the filtration system. Their equidistant distribution can balance the weight of the device, thereby enhancing the overall stability of the system.

[0050] Please see the appendix Figure 1 Appendix Figure 2 Appendix Figure 3 Appendix Figure 7 With appendix Figure 8Filter boxes 1, 3, and 4 are each equipped with filter components of different precision. Each filter component includes a filter tube 17, which is equidistantly arranged inside the filter boxes 1, 3, and 4. Each filter tube 17 is equipped with a filter screen 21, which is a coarse filter screen, a medium filter screen, and a fine filter screen. The coarse filter screen, the medium filter screen, and the fine filter screen are respectively arranged inside the filter boxes 1, 3, and 4. Each filter tube 17 is provided with a drain hole 22 at equal intervals. Filter box 1 is provided with multiple water inlet flanges 12 on its exterior. Filter box 1 is provided with a baffle 27 on its inner top wall.

[0051] Filter boxes 1, 3, and 4 are each equipped with filter components of different precision. Each filter component includes filter tubes 17, which are equidistantly arranged inside the filter box and have filter screens 21 on their exterior. The filter screens 21 are coarse, medium, and fine. The coarse filter is located in filter box 1 and is mainly used to remove large particles. The medium filter is located in filter box 3 and is used to further remove suspended particles. The fine filter is located in filter box 4 and is used to remove fine particles from the water, thereby ensuring the clarity of the water.

[0052] Each filter box is equipped with a data acquisition component, including a dissolved oxygen sensor 23, a pH sensor 24, an ammonia nitrogen sensor 25, and a turbidity sensor 26. The dissolved oxygen sensor 23, pH sensor 24, ammonia nitrogen sensor 25, and turbidity sensor 26 are all installed on the inner walls of filter box 1, filter box 2, filter box 3, and filter box 4, and are arranged at certain intervals. The dissolved oxygen sensor 23, pH sensor 24, ammonia nitrogen sensor 25, and turbidity sensor 26 transmit the acquired data to the central control system.

[0053] Each filter box is equipped with a data acquisition unit, including a dissolved oxygen sensor 23, a pH sensor 24, an ammonia nitrogen sensor 25, and a turbidity sensor 26. The data acquisition unit monitors water parameters in real time and transmits the collected data to the central control system. The central control system includes a monitoring module and an analysis module. The monitoring module is responsible for receiving data collected by the dissolved oxygen sensor 23, pH sensor 24, ammonia nitrogen sensor 25, and turbidity sensor 26. The analysis module analyzes the collected data through a data processing unit, thereby realizing intelligent control and operation optimization of the filtration system.

[0054] Filter box 2 is used to adsorb dissolved organic matter in water. Filter box 2 contains a biological filter layer 28 and an activated carbon layer 29. Multiple outlet flanges 2 16 are equidistantly arranged on the rear side of filter box 2. Filter box 2 adsorbs dissolved organic matter in water through the combined action of the biological filter layer 28 and the activated carbon layer 29. Nitrifying bacteria attached to the biological filter layer 28 decompose harmful substances such as ammonia nitrogen and nitrite in the water, converting them into relatively safe nitrates, thereby effectively reducing the toxicity of the water and improving its safety. The activated carbon layer 29 has a high adsorption capacity, adsorbing dissolved organic matter, odors, and other trace pollutants in the water, further purifying the water and improving its physical and chemical properties. The multiple outlet flanges 2 16 equidistantly arranged on the rear side of filter box 2 are used to evenly transport the treated water to the next filtration unit or other treatment equipment, ensuring uniform water flow distribution and avoiding localized differences in treatment effect caused by uneven water flow.

[0055] Please see the appendix Figure 9 The central control system includes:

[0056] Monitoring module: It is used to transmit the data collected by dissolved oxygen sensor 23, pH sensor 24, ammonia nitrogen sensor 25 and turbidity sensor 26 to the central control system;

[0057] Analysis module: It analyzes the data collected in the central control system through the data processing unit;

[0058] The central control system includes a monitoring module and an analysis module. The monitoring module transmits water quality parameter data collected by dissolved oxygen sensor 23, pH sensor 24, ammonia nitrogen sensor 25, and turbidity sensor 26 to the central control system in real time. Dissolved oxygen sensor 23 detects the dissolved oxygen concentration in the water to determine if the water meets the oxygen requirements of aquatic organisms. pH sensor 24 monitors the acidity / alkalinity of the water, promptly detecting abnormal fluctuations and ensuring the acid-base balance is suitable for aquaculture. Ammonia nitrogen sensor 25 monitors the ammonia nitrogen concentration in the water in real time, detecting whether it exceeds a safe threshold to warn of potential toxic risks. Turbidity sensor 26 assesses the transparency of the water, determining the working status and efficiency of the filtration system. After collecting real-time data from these sensors, the monitoring module transmits it to the analysis module of the central control system. The analysis module analyzes and processes the collected data through a data processing unit, combining it with preset system operating parameters to comprehensively evaluate the water quality. The analysis results can be used to trigger the system's automatic adjustment functions, such as adjusting the on / off state of electronic valve 14 and electronic valve 25, controlling the water flow rate, or starting the high-pressure pump 9 and backwashing function, thereby achieving intelligent management and efficient operation of the entire filtration device.

[0059] Working Principle: This multi-layer graded filtration device for recirculating aquaculture achieves efficient water purification and self-cleaning maintenance through graded filtration and backwashing functions in filter boxes 1 to 4. Filter box 1 performs coarse filtration, removing large particles. Water enters through inlet flange 12, undergoes preliminary filtration through coarse filter screen 21, and is then discharged through filter pipe 17. Baffle 27 is installed on the inner top wall of filter box 1 to prevent direct water flow impact on filter pipe 17, protecting the filtration structure and optimizing water flow distribution. Filter box 2 performs intermediate filtration, further removing suspended particles and finer impurities through medium filter screen 21, ensuring further water purification. Baffle 31 isolates the pipe section connected to the water supply pipe 30, preventing direct water flow interference with the filtration area. Filter box 4 uses fine filter screen 21 to further filtration the water. Fine filtration removes tiny particles completely, ensuring clear water quality. Meanwhile, baffle 2 31 further isolates the water from external interference from the water supply pipe 30, optimizing water flow distribution. Filter box 3 adsorbs dissolved organic matter in the water through a biological filtration layer 28 and an activated carbon layer 29, and further purifies the water by decomposing ammonia nitrogen and other harmful substances through nitrifying bacteria. The purified water is discharged from outlet flange 2 16. The data collection components consist of a dissolved oxygen sensor 23, a pH sensor 24, an ammonia nitrogen sensor 25, and a turbidity sensor 26, evenly distributed within each filter box. These components monitor water parameters in real time and transmit data through a monitoring module in the central control system. The central control system's analysis module processes the data to regulate the operation of the high-pressure pump 9, electronic valve 14, and electronic valve 2 15, achieving intelligent adjustment of water flow and filtration frequency.

[0060] During the filtration process, the central control system switches the state of the electronic valves, closes the normal filtration path, and supplies water to the filter pipe 17 in reverse through the high-pressure pump 9. The backwash water flows from the drain hole 22 of the filter pipe 17 to the surface of the filter screen 21 in reverse, washing away the attached impurities and particles. The impurities and backwash wastewater are introduced into the sedimentation tank 8 through the drain pipe 32. After the solid impurities are deposited in the sedimentation tank 8, they are discharged through the outlet flange 7. After the backwashing is completed, the central control system switches the electronic valve 14 and the electronic valve 25 to restore the normal filtration path, and the device continues to purify the water.

[0061] The ultraviolet sterilizer 10 sterilizes and disinfects the filtered water, and the water pump 13 returns the purified water to the aquaculture system. Each filter box is connected to the top mounting hole 19 for easy installation and removal of the filter pipe 17. The rubber ring 20 provides a sealing effect to ensure stable operation of the device. The support leg 11 provides structural stability to the device. The L-fixing plate 15 and L-fixing plate 26 are connected by bolts to fix each filter box to ensure safe and reliable operation of the device.

[0062] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-layer graded filtration device for recirculating aquaculture, characterized in that, include: Filter box 1 (1) is used to remove large particulate impurities from water; Filter box 2 (2) is used to adsorb dissolved organic matter in water; Filter box three (3) is used for deep filtration of water; Filter box four (4) is used to further remove suspended particles and fine impurities; Each of the filter boxes is equipped with a collection component. The filter boxes one (1), three (3) and four (4) are respectively equipped with filter components of different precision. The filter assembly includes filter tubes (17), which are equidistantly arranged inside filter box 1 (1), filter box 3 (3) and filter box 4 (4). Filter screens (21) are provided on the outside of each filter tube (17), and the filter screens (21) are respectively coarse filter screen, medium filter screen and fine filter screen. The coarse filter screen, medium filter screen and fine filter screen are respectively arranged inside filter box 1 (1), filter box 3 (3) and filter box 4 (4). Drain holes (22) are provided equidistantly on the outside of each filter tube (17). Multiple water inlet flanges (12) are provided on the outside of filter box 1 (1). Baffle 1 (27) is provided on the inner top wall of filter box 1 (1). The filter box 1 (1), filter box 3 (3) and filter box 4 (4) are all equipped with baffle 2 (31). The baffle 2 (31) and the inner wall of filter box 1 (1), filter box 3 (3) and filter box 4 (4) are all sandwiched. The filter pipe (17) is connected to the water supply pipe (30) through the pipe. The water supply pipe (30) is connected to the output end of the high pressure pump (9) through the pipe. The high pressure pump (9) is located on the outside of filter box 2 (2). The outside of the water supply pipe (30) is equipped with electronic valve 1 (14). The outside of filter box 1 (1), filter box 3 (3) and filter box 4 (4) are all connected to the inlet of sedimentation tank (8) through drain pipe (32).

2. The multi-layer graded filtration device for recirculating aquaculture as described in claim 1, characterized in that, The filter box 2 (2) is provided with a biological filter layer (28) and an activated carbon layer (29) respectively. Multiple water outlet flanges 2 (16) are provided at equal intervals on the rear side of the filter box 2 (2).

3. The multi-layer graded filtration device for recirculating aquaculture as described in claim 1, characterized in that, The data acquisition components include a dissolved oxygen sensor (23), a pH sensor (24), an ammonia nitrogen sensor (25), and a turbidity sensor (26). The dissolved oxygen sensor (23), pH sensor (24), ammonia nitrogen sensor (25), and turbidity sensor (26) are all installed on the inner walls of filter box one (1), filter box two (2), filter box three (3), and filter box four (4). The dissolved oxygen sensor (23), pH sensor (24), ammonia nitrogen sensor (25), and turbidity sensor (26) are arranged at certain intervals. The dissolved oxygen sensor (23), pH sensor (24), ammonia nitrogen sensor (25), and turbidity sensor (26) transmit the acquired data to the central control system.

4. The multi-layer graded filtration device for recirculating aquaculture as described in claim 1, characterized in that, The sedimentation tank (8) is located outside the filter box (2), and the sedimentation tank (8) is provided with a water outlet flange (7). Each connecting pipe of the drain pipe (32) is provided with an electronic valve (15).

5. The multi-layer graded filtration device for recirculating aquaculture as described in claim 1, characterized in that, The tops of filter boxes 2, 3 and 4 are provided with multiple mounting holes (19) at equal intervals. The inner side of each mounting hole (19) is provided with an annular groove (18). A rubber ring (20) is provided on the inner side of the annular groove (18). The lower end of each filter tube (17) is engaged with the mounting hole (19), and the outer diameter of the filter tube (17) is in contact with the rubber ring (20). The outer diameter of the rubber ring (20) is larger than the inner diameter of the annular groove (18).

6. The multi-layer graded filtration device for recirculating aquaculture as described in claim 1, characterized in that, Multiple water pumps (13) are equidistantly arranged on the top of the filter box (1). Each water pump (13) is equipped with an electronic valve (14) at its output end. Multiple ultraviolet sterilizers (10) are equidistantly arranged on the rear side of the filter box (3). The inlet of the ultraviolet sterilizer (10) is connected to the outlet flange (16). The outlet of the ultraviolet sterilizer (10) is connected to the input end of the water pump (13) through a pipe.

7. The multi-layer graded filtration device for recirculating aquaculture as described in claim 1, characterized in that, The four outer corners of the filter box 1 (1) are provided with L-fixed plates 2 (6). The four outer corners of the filter box 3 (3) and the filter box 4 (4) are provided with L-fixed plates 1 (5) and L-fixed plates 2 (6) at equal intervals. The four outer corners of the filter box 2 (2) are provided with L-fixed plates 1 (5). The L-fixed plates 1 (5) and L-fixed plates 2 (6) are connected by bolts.

8. The multi-layer graded filtration device for recirculating aquaculture as described in claim 1, characterized in that, The bottom corners of the filter box (2) and the sedimentation box (8) are provided with support legs (11), and the support legs (11) are evenly distributed.

9. The multi-layer graded filtration device for recirculating aquaculture as described in claim 3, characterized in that, The central control system includes: Monitoring module: It is used to transmit the data collected by the dissolved oxygen sensor (23), pH sensor (24), ammonia nitrogen sensor (25) and turbidity sensor (26) to the central control system; Analysis module: It analyzes the data collected in the central control system through the data processing unit.

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