In-situ purification system for aquaculture water body

Abstract

The invention relates to the technical field of aquaculture, and particularly discloses an aquaculture water body in-situ purification system which comprises a reaction bin, a water inlet pipe and a water outlet pipe are installed on the two sides of the reaction bin respectively, a liquid pump is fixedly installed at one end of the water inlet pipe of the reaction bin, and a water suction mechanism is fixedly installed at a water inlet of the liquid pump through a pipeline. The arc rod is matched with the arc through groove of the outer arc barrel, in the water suction process, when water enters the outer arc barrel from a gap between the arc rod and the arc through groove, large foreign matter is blocked through the arc rod, and flow impact in the water suction process is matched with arc bending of the arc rod and the arc surface of the outer arc barrel, so that the water suction efficiency is improved. Foreign matters which cannot enter are impacted to two sides and are separated from a water absorption position, so that a self-cleaning effect is realized.

Description

Technical Field

[0001] This application relates to the technical field of aquaculture, and in particular to an in-situ purification system for aquaculture water. Background Technology

[0002] Traditional aquaculture models face bottlenecks such as severe nitrogen pollution in aquaculture wastewater, high dependence on chemical drugs, and large water consumption. Existing purification technologies, such as off-site treatment facilities (e.g., sedimentation tanks, filter dams), have the problems of large land area requirements and high construction and operation costs; while conventional in-situ technologies, such as simple aeration or the addition of microbial agents, often have drawbacks such as low purification efficiency, poor stability, and limited functionality.

[0003] Although some recirculating aquaculture systems (RAS) exist, their core biological filters suffer from slow start-up, limited treatment capacity, high susceptibility to water temperature fluctuations, and complex management, making them difficult to widely adopt in traditional pond aquaculture. Therefore, the industry urgently needs an integrated in-situ purification solution that can be integrated into the aquaculture environment, offering high efficiency, stability, and the ability to achieve "simultaneous aquaculture, purification, and remediation." Summary of the Invention

[0004] To address the problem of low purification efficiency in existing purification equipment, this application provides an in-situ purification system for aquaculture water.

[0005] This application provides an in-situ purification system for aquaculture water, which adopts the following technical solution: An in-situ purification system for aquaculture water includes: The reaction chamber has an inlet pipe and an outlet pipe installed on both sides. Inside the reaction chamber, a fine filtration mechanism, a catalytic mechanism, a nitrification mechanism, and a slow-release mechanism are installed in sequence. The fine filtration mechanism is used to filter large particulate impurities. The catalytic mechanism, nitrification mechanism, and slow-release mechanism are installed in sequence from the inlet pipe to the outlet pipe. One end of the inlet pipe of the reaction chamber is connected to a water suction mechanism. The water suction mechanism includes a water inlet cylinder. The top of the outer side of the water inlet cylinder is uniformly provided with grid grooves, and an outer arc cylinder is fixedly installed at the grid groove on the outer side of the water inlet cylinder. The outer side of the outer arc cylinder is uniformly provided with arc through grooves, and arc rods are fixedly installed at the arc through grooves of the outer arc cylinder. An inner guide cover is fixedly installed on the inner wall of the water inlet cylinder, and an inner cone cylinder is fixedly installed on the top of the inner wall of the water inlet cylinder. The inner cone cylinder is located inside the inner guide cover, and through grooves are uniformly provided on the top of the outer side of the inner cone cylinder.

[0006] By adopting the above technical solution, and by setting an outer arc cylinder in conjunction with an arc rod structure, large particles of foreign matter are physically blocked and automatically discharged during the water flow intake process, preventing foreign matter from accumulating and clogging at the inlet; the conical structure of the inner guide cover and the inner cone cylinder guides the direction of water flow, causing foreign matter to settle in the buffer space, avoiding direct blockage of the channel, and improving water absorption stability and self-cleaning ability.

[0007] In some embodiments, the outer diameter of the outer arc cylinder gradually decreases from the center to both ends; the outer diameter of the inner guide cover gradually decreases from top to bottom; and the outer diameter of the inner cone cylinder gradually decreases from top to bottom. In some embodiments, the fine filtration mechanism includes a fine filter frame, with an outlet groove on the side of the fine filter frame away from the water inlet pipe of the reaction chamber, and a tortuous plate fixedly installed on the inner wall of the fine filter frame. The bottom end of the tortuous plate is inclined toward the outlet groove side of the fine filter frame, and the tortuous position of the bottom end of the tortuous plate corresponds to the position of the water inlet pipe of the reaction chamber. A frame groove is opened on the top of the outer side of the tortuous plate, and a fixed frame is slidably installed at the frame groove of the tortuous plate. A filter plate is fixedly installed on the inner wall of the fixed frame, and the filter plate corresponds to the frame groove of the tortuous plate. In some embodiments, the catalytic mechanism includes a catalytic frame, with an inlet groove at the bottom of the catalytic frame near the fine filter frame, and the inlet groove of the catalytic frame corresponding to the outlet groove of the fine filter frame. An outlet groove is provided at the top of the catalytic frame away from the fine filter frame. Multiple inner baffles are fixedly installed on the inner wall of the catalytic frame, with the inner baffles spaced apart and located between the inlet groove and the outlet groove of the catalytic frame. In some embodiments, the inner baffles are installed at an angle inside the catalytic frame, and the top of the upper inner baffle has a through groove on the side near the water inlet tank, and the bottom of the lower inner baffle has a through groove on the side near the water outlet tank. The inner wall of the catalytic frame is provided with bed plates, which are adjacent to the inner baffles and are equidistantly arranged inside the catalytic frame. In some embodiments, the bed plate is provided with multiple fixing grooves, with adjacent fixing grooves spaced apart. The bottom of the fixing grooves is a water-permeable structure. The bed plate is installed at an angle inside the catalyst frame, and a denitrification catalyst is provided in the fixing grooves. In some embodiments, the nitrification mechanism is constructed as a simultaneous nitrification and denitrification biochemical culture chamber, which includes a nitrification frame with inlet and outlet channels on both sides. Multiple internal partitions are installed within the nitrification frame, forming a treatment chamber between them. Grooves are formed on the internal partitions, penetrating through them. A nitrification chamber is located within the treatment chamber, and a partition plate is installed within the nitrification chamber, dividing it into an aerobic zone and an anoxic zone. Guide holes are provided on the partition plate to allow water treated in the aerobic zone to flow to the anoxic zone. An aeration regulating pipe is installed in the aerobic zone, connected to an external air source to provide controllable airflow. An aerobic biofilm carrier is filled in the aerobic zone, and a slow-release carbon source dosing component is installed in the anoxic zone. In some embodiments, the nitrification chamber includes symmetrically arranged grating plates and guide plates. The grating plates are fixedly connected to the inner wall of the nitrification frame. The grating plates are disposed between the inlet tank and the outlet tank. The guide plates are fixedly connected to the inner wall of the nitrification frame and are also fixedly connected to the grating plates. In some embodiments, the slow-release carbon source dosing assembly includes multiple adsorption spheres with a porous structure. The inner layer of the adsorption sphere is a biodegradable slow-release carbon source core material, and the outer layer is an anaerobic biofilm carrier for enriching denitrifying bacteria. In some embodiments, the slow-release mechanism includes a slow-release frame, with an inlet groove on the side of the slow-release frame near the nitrification frame, and the inlet groove of the slow-release frame corresponding to the outlet groove of the nitrification frame. A perforated plate is fixedly installed on the inner wall of the slow-release frame, and multiple perforated plates are provided. Compared with the prior art, this application includes at least one of the following beneficial technical effects: 1. The catalytic and nitrification mechanisms work synergistically to form a dual-pathway total nitrogen removal mechanism that combines chemical catalytic denitrification with simultaneous biological nitrification and denitrification. This mechanism can achieve a total nitrogen removal rate of over 85% in aquaculture water, with nitrite nitrogen and nitrate nitrogen removal rates of over 90% and 80%, respectively. 2. Under low temperature (≤15℃) conditions, the denitrification catalyst can still maintain more than 70% of the denitrification activity, which is significantly better than a single biological treatment system; 3. The slow-release carbon source in the inner layer of the adsorption ball can maintain the activity of denitrifying bacteria for more than 6 months, eliminating the need for artificial carbon source replenishment and reducing operating costs by more than 30%. The inner baffle and the guide plate work together, utilizing the relative positions of the inner baffle grooves and the flow guidance of the guide plate to make the water flow in a tortuous manner between the inner baffles and through the gaps between the grid plates, contacting the adsorption ball, increasing the contact time with the denitrifying bacteria, and improving the water treatment effect. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the overall structure of this application.

[0009] Figure 2 This is a cross-sectional view of the water absorption mechanism of this application.

[0010] Figure 3 This is a schematic diagram of the fine filtration mechanism of this application.

[0011] Figure 4 This is a cross-sectional view of the fine filtration mechanism of this application.

[0012] Figure 5 This is a cross-sectional view of the catalytic mechanism of this application.

[0013] Figure 6 This is a cross-sectional view of the nitration mechanism in this application.

[0014] Figure 7 This is a cross-sectional view of the nitration mechanism in this application.

[0015] Figure 8 This is a cross-sectional view of the extended-release mechanism in this application.

[0016] In the picture: 1. Reaction chamber; 2. Fine filtration mechanism; 3. Catalytic mechanism; 4. Nitrification mechanism; 5. Slow-release mechanism; 6. Liquid pump; 7. Water suction mechanism; 21. Fine filter frame; 22. Bending plate; 23. Fixing frame; 24. Filter plate; 31. Catalytic frame; 32. Inner baffle; 33. Bed plate; 34. Denitrification catalyst; 41. Nitrification frame; 42. Inner partition; 421. Groove; 43. Guide plate; 44. Grating plate; 45. Adsorption ball; 46. Nitrification chamber; 47. Nitrification cavity; 48. Separator; 49. Aerobic zone; 50. Anoxic zone; 51. Slow-release frame; 52. Orifice plate; 71. Water inlet cylinder; 72. Outer arc cylinder; 73. Arc rod; 74. Inner guide cover; 75. Inner cone cylinder. Detailed Implementation

[0017] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0018] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the term "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Furthermore, the character " / " in this document, unless otherwise specified, generally indicates that the preceding and following related objects have an "or" relationship.

[0019] See Figure 1 and Figure 2This application provides an in-situ purification system for aquaculture water, comprising a reaction chamber 1. An inlet pipe and an outlet pipe are installed on both sides of the reaction chamber 1. Inside the reaction chamber 1 are installed a fine filtration mechanism 2, a catalytic mechanism 3, a nitrification mechanism 4, and a slow-release mechanism 5, installed sequentially from the inlet pipe to the outlet pipe. A liquid pump 6 is fixedly installed at one end of the inlet pipe of the reaction chamber 1, and a suction mechanism 7 is fixedly installed at the inlet of the liquid pump 6 via a pipe. The suction mechanism 7 includes an inlet cylinder 71, with uniformly spaced grid grooves on the top of the outer side of the inlet cylinder 71. An outer arc cylinder 72 is fixedly installed at the grid groove on the outside of the water inlet cylinder 71. The outer diameter of the outer arc cylinder 72 gradually decreases from the center to both ends. Arc grooves are evenly opened on the outer side of the outer arc cylinder 72. Arc rods 73 are fixedly installed at the arc grooves of the outer arc cylinder 72. An inner guide cover 74 is fixedly installed on the inner wall of the water inlet cylinder 71. The outer diameter of the inner guide cover 74 gradually decreases from top to bottom. An inner cone cylinder 75 is fixedly installed on the top of the inner wall of the water inlet cylinder 71. The inner cone cylinder 75 is located inside the inner guide cover 74. The outer diameter of the inner cone cylinder 75 gradually decreases from top to bottom. Through grooves are evenly opened on the top of the outer side of the inner cone cylinder 75.

[0020] In use, the water suction mechanism 7 is placed inside the water body to be purified. The liquid pump 6 is activated, drawing water through the suction mechanism 7 into the reaction chamber 1 for purification. Inside the reaction chamber 1, the water sequentially passes through the fine filtration mechanism 2, the catalytic mechanism 3, the nitrification mechanism 4, and the slow-release mechanism 5, undergoing sequential treatment. After purification, the water is guided to the aeration equipment for oxygenation and then returned to the water body. By utilizing the arc-shaped bar 73 and the arc-shaped groove of the outer arc cylinder 72, during the water suction process, as water enters the outer arc cylinder 72 through the gap between the arc-shaped bar 73 and the arc-shaped groove, the arc-shaped bar 73 blocks large foreign objects. The flow impact during water suction, combined with the arc-shaped bend of the arc-shaped bar 73 and the arc surface of the outer arc cylinder 72, forces foreign objects that cannot enter to the sides, removing them from the suction position, thus improving water suction stability and self-cleaning ability.

[0021] See Figure 3 and Figure 4The fine filtration mechanism 2 includes a fine filter frame 21. A water outlet groove is opened on the side of the fine filter frame 21 away from the water inlet pipe of the reaction chamber 1. A tortuous plate 22 is fixedly installed on the inner wall of the fine filter frame 21. The bottom end of the tortuous plate 22 is inclined towards the water outlet groove side of the fine filter frame 21, and the tortuous position of the bottom end of the tortuous plate 22 corresponds to the position of the water inlet pipe of the reaction chamber 1. A frame groove is opened on the top of the outer side of the tortuous plate 22. A fixed frame 23 is slidably installed at the frame groove of the tortuous plate 22. A filter plate 24 is fixedly installed on the inner wall of the fixed frame 23. The filter plate 24 corresponds to the frame groove of the tortuous plate 22. In the fine filtration mechanism 2, the inclined position of the bottom of the zigzag plate 22 corresponds to the position of the water inlet pipe of the reaction chamber 1. This allows the introduced water to first impact the inclined position, using the inclination for guidance. Subsequently, the liquid level rises inside the fine filter frame 21. When it reaches the frame groove of the zigzag plate 22, it is filtered by the filter plate 24. The filtered water reaches the other side of the zigzag plate 22 and is introduced into the catalytic mechanism 3 through the water outlet groove of the fine filter frame 21. The bottom end of the zigzag plate 22 is inclined towards the water outlet groove and corresponds to the position of the water inlet pipe. This guides the water flow to impact the zigzag part first before rising, avoiding direct impact of the water flow on the filter plate 24 and extending the life of the filter material. At the same time, the zigzag structure forms a sedimentation zone for impurities, reducing the risk of filter plate clogging.

[0022] Reference Figure 5 The catalytic mechanism 3 includes a catalytic frame 31. A water inlet groove is formed at the bottom of the catalytic frame 31 near the fine filter frame 21, and the water inlet groove of the catalytic frame 31 corresponds to the water outlet groove of the fine filter frame 21. A water outlet groove is formed at the top of the catalytic frame 31 away from the fine filter frame 21. Two inner baffles 32 are fixedly installed on the inner wall of the catalytic frame 31, and the inner baffles 32 are located between the water inlet groove and the water outlet groove of the catalytic frame 31. The inner baffles 32 are installed at an angle inside the catalytic frame 31. The upper inner baffle 32 has a through groove on the top side near the water inlet tank, and the lower inner baffle 32 has a through groove on the bottom side near the water outlet tank. A bed plate 33 is fixedly installed on the inner wall of the catalyst frame 31. The bed plate 33 is located between the inner baffles 32 and is equidistantly installed on the inner wall of the catalyst frame 31. The bed plate 33 is inclined inside the catalyst frame 31. Multiple fixing grooves are opened on the bed plate 33, and adjacent fixing grooves are spaced apart. A denitrification catalyst 34 is installed in the fixing groove of the catalyst frame 31. The bottom of the fixing groove is a water-permeable structure, which can be a filter screen that allows liquid to pass through but intercepts the denitrification catalyst 34. The water that has completed fine filtration is introduced into the interior of the catalytic frame 31 through the inlet tank of the catalytic frame 31. Then, the water level inside the catalytic frame 31 gradually rises, passes through the groove of the lower inner baffle 32, and enters the space between the inner baffles 32. As the water level gradually rises, it passes through the denitrification catalyst 34 between the bed plates 33. The denitrification catalyst 34 is used to treat the water. Then, it passes through the groove of the upper inner baffle 32 and is finally discharged from the outlet tank of the catalytic frame 31 and enters the nitrification mechanism 4.

[0023] Specifically, in this embodiment, the denitrification catalyst 34 comprises a modified functional support and a supported active component, wherein the active component is Pd and Cu, and the preparation method of the denitrification catalyst 34 includes the following steps: S1: Mix 50g styrene, 10g 1,2-divinylbenzene, 6g 4-vinylpyridine, 1g benzoyl peroxide and 82.5g liquid paraffin to obtain the first mixture; S2: Mix gelatin with three times its volume of water, heat to 54°C and stir until the mixture is homogeneous to obtain the second mixture; S3: Mix all of the first mixture from step S1 with the second mixture from step S2 containing 125g of gelatin, heat to 72°C with stirring, react for 5 hours, continue heating to 88°C, react for 6.5 hours with stirring, filter, wash alternately with deionized water and ethanol, reflux extract with ethanol in a Soxhlet extractor for 36 hours, and then dry to obtain the modified functional carrier. S4: The modified functional carrier from step S3 is immersed in the active solution at a ratio of 1g:1mL, the pH is adjusted to 5.5, and the mixture is shaken at 28℃ for 20h. After filtration and washing with deionized water, the catalyst precursor is obtained. The active solution is prepared by adding 2.5wt% PdCl2 and 4wt% Cu(NO3)2 to a 25wt% ethanol aqueous solution. S5: The catalyst precursor from step S4 is freeze-dried, treated at 250°C for 3 hours at 4°C / min under a nitrogen atmosphere, and then cooled to 25°C to obtain the denitrification catalyst.

[0024] This catalyst is used to catalytically decompose nitrite nitrogen and nitrate nitrogen in water. It maintains high activity even at low temperatures, thereby improving the system's stable operation throughout the year. This application innovatively integrates a high-efficiency denitrification catalyst 34 into the catalytic mechanism 3. The application of this catalyst overcomes the bottlenecks of traditional biological treatment, which is greatly affected by water temperature and has a slow start-up speed. It can quickly convert dissolved nitrogen pollutants after fine filtration into harmless nitrogen gas, significantly improving the system's denitrification efficiency and volumetric load. This allows the reaction chamber 1 to treat a larger volume of aquaculture water within the same volume, achieving equipment integration and high efficiency.

[0025] See Figure 6 to Figure 8The nitration mechanism 4 includes a nitration frame 41. Both sides of the nitration frame 41 are provided with an inlet tank and an outlet tank, and the inlet tank of the nitration frame 41 corresponds to the outlet tank of the catalytic frame 31. An inner partition 42 is fixedly installed on the inner wall of the nitration frame 41. In this embodiment, there are two inner partitions 42, and the inner partitions 42 are located between the inlet tank and the outlet tank of the nitration frame 41, forming a processing chamber between the inner partitions 42. A groove 421 is provided on both inner partitions 42, and the groove 421 penetrates the inner partition 42. The treatment chamber is equipped with a nitrification chamber 46, which in turn is equipped with a nitrification cavity 47. The nitrification cavity 47 is equipped with a partition plate 48, which divides the nitrification cavity 47 into an aerobic zone 49 and an anoxic zone 50. The partition plate 48 has flow guide holes to allow the water treated in the aerobic zone 49 to flow into the anoxic zone 50. The aerobic zone 49 is equipped with an aeration regulating pipe, which is connected to an external air source to provide a controllable airflow to the aerobic zone 49 (dissolved oxygen is maintained at 2-3 mg / L). The aerobic zone 49 is filled with an aerobic biofilm carrier (such as hydrophilic porous ceramic particles). The anoxic zone 50 is equipped with a slow-release carbon source dosing component.

[0026] The nitrification chamber 46 includes symmetrically arranged grid plates 44 and guide plates 43. The grid plates 44 are fixedly connected to the inner wall of the nitrification frame 41 and are located between the inlet tank and the outlet tank. The guide plates 43 are fixedly connected to the inner wall of the nitrification frame 41 and also to the grid plates 44. Liquid flows from the inlet tank through the inner baffle 42 into the treatment chamber, accumulates there, and then flows through the grid plates into the aerobic zone 49. The aerobic zone 49 is enriched with ammonia-oxidizing bacteria and nitrite-oxidizing bacteria, which convert ammonia nitrogen into nitrate. The liquid then enters the anoxic zone 50 through the guide holes, where denitrifying bacteria use a carbon source to reduce nitrate to nitrogen gas, thus achieving total nitrogen removal. By setting double inner baffles 42 inside the nitrification frame 41, a tortuous flow channel is formed, extending the residence time of the water in the nitrification zone and enhancing the reaction effect. By incorporating internal baffles 42, guide plates 43, and grid plates, the water is guided to flow through the grid plates 44 multiple times, increasing the number of contacts between the water and the adsorption balls 45 and improving denitrification efficiency. Physical isolation is achieved through partition plates 48. The upper part of the aerobic zone 49 is aerated to meet the nitrification reaction requirements, while the lower part of the anoxic zone 50 is not aerated, providing a dedicated environment for denitrifying bacteria and completely avoiding the inhibition of denitrification by aeration. Slow-release carbon sources are released only in the anoxic zone 50, directly supplying denitrifying bacteria and avoiding consumption by aerobic bacteria. This helps improve carbon source utilization and prolongs the duration of denitrification activity.

[0027] Furthermore, the slow-release carbon source addition component includes multiple adsorption balls 45, which have a porous structure. The inner layer of the adsorption ball 45 is a biodegradable slow-release carbon source core material (such as polyhydroxyalkanoate), and the outer layer is an anaerobic biofilm carrier for enriching denitrifying bacteria.

[0028] The slow-release mechanism 5 includes a slow-release frame 51. An inlet channel is provided on the side of the slow-release frame 51 near the nitrification frame 41, and the inlet channel of the slow-release frame 51 corresponds to the outlet channel of the nitrification frame 41. An orifice plate 52 is fixedly installed on the inner wall of the slow-release frame 51. In this embodiment, two orifice plates 52 are used. By filling the spaces between the orifice plates 52 with a slow-release material rich in calcium, magnesium, and trace elements, water comes into contact with the slow-release material as it passes through the holes of the two orifice plates 52 from bottom to top. This stabilizes and increases the total alkalinity and total hardness of the water, and continuously replenishes limiting trace elements. The water is then discharged from the outlet pipe of the reaction chamber 1, oxygenated by an aeration device, and returned to the aquaculture water.

[0029] The implementation principle of this embodiment is as follows: in-situ purification of the aquaculture water is achieved through the water suction mechanism 7 and the multi-stage purification unit in the reaction chamber 1. In use, the water suction mechanism 7 is immersed in the water and the liquid pump 6 is started. Water flows through the outer arc cylinder 72 into the inlet cylinder 71. The outer diameter of the outer arc cylinder 72 gradually decreases from the center to both ends. Combined with the blocking effect of the arc rod 73, large particles of foreign matter slide off to both sides under the impact of the water flow, preventing blockage of the inlet. After being guided by the inner guide cover 74, the water entering the inlet cylinder 71 is sucked in through the through-slot at the top of the inner cone cylinder 75. The conical structure of the inner cone cylinder 75 causes any small foreign matter that may enter to settle in the buffer space, ensuring smooth water intake. The water then enters the reaction chamber 1, flowing sequentially through the fine filtration mechanism 2, the catalytic mechanism 3, the nitrification mechanism 4, and the slow-release mechanism 5, completing multiple purification processes including physical filtration, catalytic reaction, biological nitrification, and mineral slow release. Finally, the purified water is returned to the aquaculture water, achieving in-situ purification circulation.

[0030] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An in-situ purification system for aquaculture water, characterized in that, include: The reaction chamber (1) is equipped with an inlet pipe and an outlet pipe on its two sides respectively. The interior of the reaction chamber (1) is equipped with a fine filtration mechanism (2), a catalytic mechanism (3), a nitrification mechanism (4) and a slow release mechanism (5) in sequence. The fine filtration mechanism (2) is used to filter large particulate impurities. The catalytic mechanism (3), the nitrification mechanism (4) and the slow release mechanism (5) are installed in sequence from the inlet pipe to the outlet pipe. One end of the inlet pipe of the reaction chamber (1) is connected to a water suction mechanism (7). The water suction mechanism (7) includes a water inlet cylinder (71), a grid groove is uniformly provided on the top of the outer side of the water inlet cylinder (71), and an outer arc cylinder (72) is fixedly installed at the grid groove on the outer side of the water inlet cylinder (71). An arc through groove is uniformly provided on the outer side of the outer arc cylinder (72), and an arc rod (73) is fixedly installed at the arc through groove of the outer arc cylinder (72). An inner guide cover (74) is fixedly installed on the inner wall of the water inlet cylinder (71), and an inner cone cylinder (75) is fixedly installed on the top of the inner wall of the water inlet cylinder (71). The inner cone cylinder (75) is located inside the inner guide cover (74), and a through groove is uniformly provided on the top of the outer side of the inner cone cylinder (75).

2. The in-situ purification system for aquaculture water according to claim 1, characterized in that: The outer diameter of the outer arc cylinder (72) gradually decreases from the center to both ends; the outer diameter of the inner guide cover (74) gradually decreases from top to bottom; and the outer diameter of the inner cone cylinder (75) gradually decreases from top to bottom.

3. The in-situ purification system for aquaculture water according to claim 2, characterized in that: The fine filtration mechanism (2) includes a fine filter frame (21). A water outlet groove is opened on the side of the fine filter frame (21) away from the water inlet pipe of the reaction chamber (1). A tortuous plate (22) is fixedly installed on the inner wall of the fine filter frame (21). The bottom end of the tortuous plate (22) is inclined towards the water outlet groove of the fine filter frame (21). The tortuous position of the bottom end of the tortuous plate (22) corresponds to the position of the water inlet pipe of the reaction chamber (1). A frame groove is opened on the top of the outer side of the tortuous plate (22). A fixed frame (23) is slidably installed at the frame groove of the tortuous plate (22). A filter plate (24) is fixedly installed on the inner wall of the fixed frame (23). The filter plate (24) corresponds to the frame groove of the tortuous plate (22).

4. The in-situ purification system for aquaculture water according to claim 3, characterized in that: The catalytic mechanism (3) includes a catalytic frame (31). The bottom of the catalytic frame (31) near the fine filter frame (21) has an inlet groove. The inlet groove of the catalytic frame (31) corresponds to the outlet groove of the fine filter frame (21). The top of the catalytic frame (31) away from the fine filter frame (21) has an outlet groove. Multiple inner baffles (32) are fixedly installed on the inner wall of the catalytic frame (31). The inner baffles (32) are spaced apart and located between the inlet groove and the outlet groove of the catalytic frame (31).

5. The in-situ purification system for aquaculture water according to claim 4, characterized in that: The inner baffle (32) is installed at an angle inside the catalyst frame (31). The top of the inner baffle (32) is provided with a through groove near the water inlet tank, and the bottom of the inner baffle (32) is provided with a through groove near the water outlet tank. The inner wall of the catalyst frame (31) is provided with a bed plate (33). The bed plate (33) is located between adjacent inner baffles (32), and the bed plates (33) are equidistantly arranged in the catalyst frame (31).

6. The in-situ purification system for aquaculture water according to claim 5, characterized in that: The bed plate (33) is provided with multiple fixing grooves, and the fixing grooves are spaced apart. The bottom of the fixing groove is a water-permeable structure. The bed plate (33) is installed at an angle inside the catalyst frame (31). The fixing groove is provided with a denitrification catalyst (34).

7. The in-situ purification system for aquaculture water according to claim 6, characterized in that: The nitrification mechanism (4) is constructed as a simultaneous nitrification and denitrification biochemical culture chamber, which includes a nitrification frame (41). Inlet and outlet channels are provided on both sides of the nitrification frame (41). Multiple inner partitions (42) are provided inside the nitrification frame (41), forming a processing chamber between the inner partitions (42). Grooves (421) are provided on the inner partitions (42), penetrating through them. A nitrification chamber (46) is provided inside the processing chamber, and a nitrification cavity (47) is provided inside the nitrification chamber (46). (47) is provided with a partition plate (48), which divides the nitrification chamber (47) into an aerobic zone (49) and an anoxic zone (50). The partition plate (48) is provided with a guide hole so that the water treated in the aerobic zone (49) flows to the anoxic zone (50). The aerobic zone (49) is provided with an aeration regulating pipe, which is connected to an external air source to provide a controllable airflow to the aerobic zone (49). The aerobic zone (49) is filled with an aerobic biofilm carrier. The anoxic zone (50) is provided with a slow-release carbon source dosing component.

8. The in-situ purification system for aquaculture water according to claim 7, characterized in that: The nitrification chamber (46) includes symmetrically arranged grid plates (44) and guide plates (43). The grid plates (44) are fixedly connected to the inner wall of the nitrification frame (41). The grid plates (44) are located between the inlet tank and the outlet tank. The guide plates (43) are fixedly connected to the inner wall of the nitrification frame (41) and to the grid plates (44).

9. The in-situ purification system for aquaculture water according to claim 8, characterized in that: The slow-release carbon source dosing assembly includes multiple adsorption balls (45), which have a porous structure. The inner layer of the adsorption ball (45) is a biodegradable slow-release carbon source core material, and the outer layer is an anaerobic biofilm carrier, used to enrich denitrifying bacteria.

10. The in-situ purification system for aquaculture water according to claim 9, characterized in that: The slow-release mechanism (5) includes a slow-release frame (51), which has an inlet groove on the side near the nitrification frame (41) and the inlet groove of the slow-release frame (51) corresponds to the outlet groove of the nitrification frame (41). A perforated plate (52) is fixedly installed on the inner wall of the slow-release frame (51), and multiple perforated plates (52) are provided.

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