A nitrite removal filter device for aquaculture

Abstract

The application discloses a nitrite removal filtering equipment for aquaculture and relates to the technical field of filtering. After the medicament is mixed with water, direct filtering is performed, so that the reaction time of the medicament and the nitrite in the water is short, the nitrite in the water is not fully reacted to form a precipitate during filtering, and the removal effect of the nitrite is affected. Through cooperation of the outer blocking cylinder and the inner blocking cylinder, after the medicament is mixed with water, the medicament is introduced into the gap between the outer blocking cylinder and the inner blocking cylinder through the empty groove at the bottom of the inner blocking cylinder, the medicament and the water are accumulated in the gap, and the reaction time of the medicament and the nitrite in the water is ensured before filtering treatment. Compared with the direct filtering after the medicament is mixed with water, the reaction time of the medicament and the nitrite in the water is short, the nitrite in the water is not fully reacted to form a precipitate during filtering, and part of the nitrite still exists in the water, so that the removal effect of the nitrite is reduced.

Description

Technical Field

[0001] This invention relates to the field of filtration technology, specifically to a nitrite removal filtration device for aquaculture. Background Technology

[0002] In fisheries production, high concentrations of nitrite significantly impact the production of aquatic economic animals, causing a series of negative effects such as decreased appetite, reduced survival rate, poor larval development, and inhibited gonadal development in adults. Therefore, it is essential to develop fisheries production equipment that effectively removes nitrite from water. Nitrite can be removed through various methods, including physical, chemical, and biological methods. The chemical method involves adding chemical agents to the water, causing nitrite to react with the agents to form a precipitate, which is then removed from the water through precipitation separation. The most common agent is calcium hydroxide, which reacts with nitrite to form an insoluble calcium nitrite precipitate, which is then removed by filtration, thus achieving the removal of nitrite from the water.

[0003] When the reagent reacts with nitrite in the water, the reagent is mixed with water and then filtered directly. This results in a short reaction time between the reagent and the nitrite in the water. During filtration, the nitrite in the water does not react fully and precipitate, which affects the removal efficiency of nitrite. Summary of the Invention

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A nitrite removal filtration device for aquaculture, comprising:

[0006] The frame has a medicine tank installed inside and a liquid pump fixedly installed inside the frame.

[0007] A filter tank is installed on top of the frame and is used for preliminary filtration of aquaculture water.

[0008] A filter box is installed inside the frame, and a connecting pipe is installed on the top of the filter box, which is connected to the filter tank through the connecting pipe.

[0009] A spraying mechanism is installed inside the filter box, and a conduit is fixedly installed at the bottom of the spraying mechanism. The end of the conduit away from the spraying mechanism is connected to the outlet of the liquid pump.

[0010] An inner baffle is fixedly installed on the inner wall of the filter box. The inner baffle is located outside the spraying mechanism, and the bottom of the outer side of the inner baffle is evenly provided with slots. An outer baffle is installed inside the filter box. The upper and lower ends of the outer baffle are fixedly connected to the upper and lower sides of the inner wall of the filter box, respectively, and the top of the outer side of the outer baffle is evenly provided with slots. Through the cooperation of the outer baffle and the inner baffle, after the agent and water are mixed, they are introduced into the gap between the outer baffle and the inner baffle through the slot at the bottom of the inner baffle. This allows the agent and water to accumulate in the gap, ensuring sufficient reaction time between the agent and the nitrite in the water before filtration. Compared to directly filtering after mixing the agent and water, which results in a shorter reaction time between the agent and the nitrite in the water, the nitrite in the water will be less concentrated during filtration. Insufficient reaction leads to precipitation, preventing some nitrite from remaining in the water and reducing the nitrite removal effect. The outer baffle is located outside the inner baffle and has a gap between them. Both the inner wall of the outer baffle and the outer side of the inner baffle are fixedly installed with inner ring plates. The inner ring plates are inclined downwards at their closest ends, utilizing the space between the inner and outer baffles to provide time for the reagent to react with the nitrite. At the same time, the staggered arrangement of the inner ring plates makes the water flow path tortuous when the water level rises, so that the precipitate formed by the reaction is blocked by the inclined inner ring plates. The filter bag filters the precipitate. The inner ring plates are staggered and inclined downwards at their closest ends.

[0011] Preferably, a grid cylinder is fixedly installed inside the filter box, the grid cylinder is located outside the outer baffle cylinder, the outer side of the grid cylinder is evenly provided with grid grooves, and a filter bag is fixedly installed on the inner wall of the grid cylinder, and a drain pipe is fixedly installed on the outer side of the filter box.

[0012] Preferably, the spraying mechanism includes a conical column with an outer diameter that gradually increases from top to bottom. Spraying grooves are evenly distributed on the outer side of the conical column, and these grooves slope downwards from the outside in. A column groove is located at the center of the top of the conical column. Utilizing the inclination of the spraying grooves, the pesticide is sprayed obliquely upwards during the spraying process, interacting with the downward-flowing water to create a counter-current effect. This allows the pesticide to fully diffuse in the water, increasing the mixing and contact between the pesticide and water, and enabling the pesticide to quickly react with nitrite to form a precipitate. Simultaneously, the hydraulic pressure of the pesticide in the column grooves pushes a sliding plate upwards under the constraint of a sliding column and a compression spring, opening more spraying grooves. A connecting pipe is fixedly installed at the bottom of the conical column, communicating with the column grooves of the conical column. The bottom end of the connecting pipe is fixedly connected to one end of a conduit. A top plate is fixedly installed at the top of the conical column.

[0013] Preferably, a sliding column is slidably installed on the inner wall of the top plate, and a sliding plate is fixedly installed at the bottom end of the sliding column. The bottom of the sliding plate is an arc surface that is concave inward at the center position, and the outer side of the sliding plate is slidably adapted to the groove of the conical column. A spring is fixedly installed between the sliding plate and the top plate. A partition plate is fixedly installed on the outer side of the conical column, and the partition plate is evenly installed along the center position of the conical column. The partition plate is located between the spraying tanks. The side of the partition plate away from the conical column is fixedly connected to the inner wall of the inner baffle. Guide plates are fixedly installed on both sides of the partition plate. Through the cooperation of the guide plates and the partition plates, when the agent and water are flushed, the partition plates separate the liquid to avoid mutual interference between the spraying tanks. At the same time, the guide plates guide the water to the outlet position of the spraying tank, assisting the spraying tank to spray the agent obliquely upward, improving the flushing effect of water and agent. The side of the guide plate away from the partition plate is obliquely downward.

[0014] Preferably, the filter tank includes a tank body, with support rings fixedly installed at both ends of the outer side of the tank body. The tank body is fixedly connected to the frame through the support rings, and a water inlet pipe is fixedly installed at one end of the tank body. An inner guide tube is fixedly installed at the center of the inner wall of the tank body. Circular grooves are evenly opened at the top of the outer side of the inner guide tube, and end caps are fixedly installed at both ends of the outer side of the inner guide tube. A grid frame and a top arc cover are fixedly installed between the end caps. The grid frame is located on both sides of the top arc cover, and frame grooves are opened on both sides of the top arc cover. The inside of the grid frame has space for filling activated carbon.

[0015] This invention provides a nitrite removal and filtration device for aquaculture. It has the following beneficial effects:

[0016] I. The nitrite removal filtration equipment for this aquaculture system uses an outer baffle and an inner baffle. After the agent and water are mixed, the mixture is introduced into the gap between the outer and inner baffles through an empty groove at the bottom of the inner baffle. This allows the agent and water to accumulate in the gap, ensuring sufficient reaction time between the agent and the nitrite in the water before filtration. Compared to directly filtering after mixing the agent and water, this method results in a shorter reaction time between the agent and the nitrite in the water. During filtration, the nitrite in the water does not fully react and precipitate, leaving some nitrite still in the water and reducing the nitrite removal efficiency.

[0017] II. The nitrite removal filtration equipment for this aquaculture uses an inner ring plate that is inclined downwards at one end. This utilizes the space between the inner and outer baffles to provide time for the reaction between the reagent and the nitrite. At the same time, the staggered inner ring plates make the water flow path tortuous when the water level rises. This causes the precipitate formed by the reaction to be blocked by the inclined inner ring plates, and the filter bag is used to filter the precipitate.

[0018] Third, the nitrite removal and filtration equipment for this aquaculture uses the tilt of the spray tank to spray the agent upwards during the spraying process. This interacts with the downward-flowing water to create a counter-current, allowing the agent to fully diffuse in the water and increasing the mixing and contact between the agent and the water. This enables the agent to quickly react with the nitrite to form a precipitate. At the same time, the hydraulic pressure of the agent in the column tank pushes the sliding plate upwards under the restriction of the sliding column and the compression spring, opening more spray tanks.

[0019] IV. The nitrite removal filtration equipment for this aquaculture uses a guide plate and a partition plate in combination. When the agent and water are flushed, the partition plate separates the liquid to avoid mutual interference between the spray tanks. At the same time, the guide plate guides the water to the outlet of the spray tank, assisting the spray tank to spray the agent at an angle upward, thereby improving the flushing effect between the water and the agent. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a nitrite removal filtration device for aquaculture according to the present invention;

[0021] Figure 2 This is a partial structural schematic diagram of a nitrite removal and filtration device for aquaculture according to the present invention.

[0022] Figure 3 This is a partial structural cross-sectional view of a nitrite removal filtration device for aquaculture according to the present invention;

[0023] Figure 4 This is a partial sectional side view of a nitrite removal filtration device for aquaculture according to the present invention;

[0024] Figure 5 This is a schematic diagram of the spraying mechanism of the present invention;

[0025] Figure 6 This is a sectional view of the spraying mechanism of the present invention;

[0026] Figure 7 This is a schematic diagram of the structure of the filter tank of the present invention;

[0027] Figure 8 This is a cross-sectional view of the filter tank of the present invention;

[0028] Figure 9 This is a partial structural diagram of the filter tank of the present invention.

[0029] In the diagram: 1. Frame; 2. Filter tank; 3. Filter box; 4. Liquid pump; 5. Chemical tank; 6. Connecting pipe; 7. Drain pipe; 8. Spraying mechanism; 9. Grille cylinder; 10. Outer baffle; 11. Guide tube; 12. Filter bag; 13. Inner ring plate; 14. Inner baffle; 21. Water inlet pipe; 22. Tank body; 23. Support ring; 24. Inner guide tube; 25. End cover plate; 26. Grille frame; 27. Top arc cover; 81. Connecting pipe; 82. Conical column; 83. Guide plate; 84. Top plate; 85. Divider plate; 86. Sliding column; 87. Spring; 88. Sliding disc. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] First embodiment, such as Figures 1 to 4 As shown, the present invention provides a technical solution:

[0032] A nitrite removal filtration device for aquaculture, comprising:

[0033] The frame 1 has a medicine tank 5 installed inside it, and a liquid pump 4 is fixedly installed inside the frame 1.

[0034] Filter tank 2 is installed on top of frame 1 and is used for preliminary filtration of aquaculture water.

[0035] Filter box 3 is installed inside the frame 1, and a connecting pipe 6 is installed on the top of the filter box 3. The filter box 3 is connected to the filter tank 2 through the connecting pipe 6.

[0036] The spraying mechanism 8 is installed inside the filter box 3, and a conduit 11 is fixedly installed at the bottom of the spraying mechanism 8. The end of the conduit 11 away from the spraying mechanism 8 is connected to the liquid outlet of the liquid pump 4.

[0037] An inner baffle 14 is fixedly installed on the inner wall of the filter box 3. The inner baffle 14 is located outside the spraying mechanism 8, and the bottom of the outer side of the inner baffle 14 is evenly provided with slots. During the process of introducing water into the filter box 3, the water is first restricted by the inner baffle 14, causing the water to move downward along the inner baffle 14. During the movement, it cooperates with the spraying mechanism 8 to mix the pesticide with the water, causing the nitrite in the water to react with the pesticide and form a precipitate. After the pesticide and water are mixed, they are discharged from the inner baffle 14 through the slots at the bottom of the outer side of the inner baffle 14 and enter the space between the inner baffle 14 and the outer baffle 10, causing the pesticide and water to accumulate between the outer baffle 10 and the inner baffle 14. An outer baffle 10 is installed inside the filter box 3, and the upper and lower ends of the outer baffle 10 are respectively connected to the inner baffle 14. The upper and lower sides of the inner wall of the filter box 3 are fixedly connected, and the top of the outer side of the outer baffle 10 is evenly provided with notches. The outer baffle 10 is located outside the inner baffle 14 and there is a gap between the outer baffle 10 and the inner baffle 14. Before filtration, the water and the agent have sufficient reaction time. At the same time, during the accumulation process, the liquid level gradually rises and the liquid passes through the inner ring plates 13. Finally, it is discharged through the notch at the top of the outer side of the outer baffle 10 and enters the gap between the grid cylinder 9 and the outer baffle 10. During the process of water and sediment passing through the grid cylinder 9, the sediment in the water is filtered by the filter bag 12 inside the grid cylinder 9. The inner wall of the outer baffle 10 and the outer side of the inner baffle 14 are both fixedly installed with inner ring plates 13. The inner ring plates 13 are staggered and the side that is close to each other is inclined downward.

[0038] A grid cylinder 9 is fixedly installed inside the filter box 3. The grid cylinder 9 is located outside the outer baffle cylinder 10. The outer side of the grid cylinder 9 is evenly provided with grid grooves, and the inner wall of the grid cylinder 9 is fixedly installed with filter bags 12. A drain pipe 7 is fixedly installed on the outer side of the filter box 3.

[0039] The second embodiment is based on the first embodiment; please refer to [link / reference]. Figures 5 to 6 As shown, the spraying mechanism 8 includes a conical column 82, the outer diameter of which gradually increases from top to bottom, and spraying grooves are evenly distributed on the outer side of the conical column 82, with the spraying grooves sloping downwards from the outside to the inside. A column groove is formed at the center of the top of the conical column 82, and a connecting pipe 81 is fixedly installed at the bottom of the conical column 82. The liquid pump 4 drives the agent inside the agent tank 5, so that the agent is pressurized by the liquid pump 4 and introduced into the connecting pipe 81 through the conduit 11. The agent is then introduced into the column groove of the conical column 82 through the connecting pipe 81. Through the connection between the column groove and the spraying groove, the agent is sprayed out through the spraying groove and mixed with water. The connecting pipe 81 is connected to the column groove of the conical column 82, and the bottom end of the connecting pipe 81 is fixedly connected to one end of the conduit 11. A top plate 84 is fixedly installed on the top of the conical column 82.

[0040] A sliding column 86 is slidably installed on the inner wall of the top plate 84. A sliding plate 88 is fixedly installed at the bottom end of the sliding column 86. The bottom of the sliding plate 88 is an arc surface that is concave inward at the center position, and the outer side of the sliding plate 88 is slidably adapted to the groove of the conical column 82. A spring 87 is fixedly installed between the sliding plate 88 and the top plate 84. A partition plate 85 is fixedly installed on the outer side of the conical column 82. During the spraying process, the spraying groove is inclined upward from the inside to the outside, so that the agent is sprayed upward when it is sprayed. Combined with the downward flow of water, it forms a counter-current with the water. The water is flushed down, and in conjunction with the partition plate 85 and the guide plate 83, the downward-flowing water is separated. At the same time, the water is guided to the spray tank position by the inclination of the guide plate 83, which improves the mixing effect. The partition plate 85 is evenly installed along the center position of the conical column 82 and is located between the spray tanks. The side of the partition plate 85 away from the conical column 82 is fixedly connected to the inner wall of the inner baffle 14. Guide plates 83 are fixedly installed on both sides of the partition plate 85, and the side of the guide plate 83 away from the partition plate 85 is inclined downward.

[0041] The third embodiment is based on embodiments one and two; please refer to [link / reference]. Figures 7 to 9 As shown, the filter tank 2 includes a tank body 22. Support rings 23 are fixedly installed at both ends of the outer side of the tank body 22. The tank body 22 is fixedly connected to the frame 1 via the support rings 23. An inlet pipe 21 is fixedly installed at one end of the tank body 22. An inner conduit 24 is fixedly installed at the center of the inner wall of the tank body 22. The inner conduit 24 is connected to a pipeline via the inlet pipe 21, allowing aquaculture water to be introduced into the tank body 22 through the inlet pipe 21. During this process, the water first enters the inner conduit 24, and through the evenly spaced circular grooves at the top of the inner conduit 24, the water enters the interior of the top arc cover 27. The water then passes through the frame grooves on both sides of the top arc cover 27, allowing the water to circulate within its own... Under the influence of gravity, the water passes through the frame groove and enters the grid frame 26. The top of the outer side of the inner guide tube 24 is evenly provided with circular grooves, and both ends of the outer side of the inner guide tube 24 are fixedly installed with end cover plates 25. The grid frame 26 and the top arc cover 27 are fixedly installed between the end cover plates 25. The grid frame 26 is located on both sides of the top arc cover 27. The activated carbon adsorption material filled inside the grid frame 26 adsorbs impurities in the water, so that the water flows downward according to its own gravity during the adsorption process and is introduced into the filter box 3 through the connecting pipe 6. The top arc cover 27 is provided with frame grooves on both sides, and the grid frame 26 has space for filling activated carbon.

[0042] In use, the aquaculture water pipe is connected to the filter tank 2 and the drain pipe 7. The water first enters the filter tank 2, where solid impurities are filtered out. After filtration, the water is introduced into the filter box through the connecting pipe 6. The liquid pump 4 drives the medicine in the medicine tank 5, which enters the spraying mechanism 8 through the conduit 11. The spraying mechanism 8 sprays the medicine into the water, causing the nitrite in the water to react with the medicine to form a precipitate. Then, the water is filtered to remove the nitrite in the discharged water.

[0043] In the filter tank 2, the water is connected to the pipeline through the water inlet pipe 21, so that the aquaculture water is introduced into the tank body 22 through the water inlet pipe 21. During the introduction process, the water first enters the inner guide tube 24, and through the evenly opened circular grooves at the top of the inner guide tube 24, the water enters the interior of the top arc cover 27 through the frame grooves on both sides of the top arc cover 27, so that the water passes through the frame grooves under its own gravity and enters the grid frame 26. The activated carbon adsorption material filled inside the grid frame 26 adsorbs the impurities in the water, so that the water flows downward according to its own gravity during the adsorption process, and is introduced into the filter box 3 through the connecting pipe 6.

[0044] During the process of introducing the filter into the filter box 3, the water is first restricted by the inner baffle 14, causing the water to move downwards along the inner baffle 14. During this movement, the water is mixed with the spraying mechanism 8, which in turn mixes the agent with the water. This causes the nitrite in the water to react with the agent, forming a precipitate. After the agent and water are mixed, the mixture is discharged from the inner baffle 14 through the empty groove at the bottom of the outer side of the inner baffle 14 and enters the space between the inner baffle 14 and the outer baffle 10. This allows the agent and water to accumulate between the outer baffle 10 and the inner baffle 14, providing sufficient reaction time for the water and agent before filtration. During the accumulation process, the liquid level gradually rises, and the liquid passes between the inner ring plates 13. Finally, it is discharged from the empty groove at the top of the outer side of the outer baffle 10 and enters the gap between the grid cylinder 9 and the outer baffle 10. As the water and precipitate pass through the grid cylinder 9, the precipitate in the water is filtered by the filter bag 12 inside the grid cylinder 9.

[0045] In the spraying mechanism 8, the liquid pump 4 drives the agent inside the agent tank 5. After the agent is pressurized by the liquid pump 4, it is introduced into the connecting pipe 81 through the conduit 11. The agent is then introduced into the groove of the conical column 82 through the connecting pipe 81. Through the connection between the groove and the spraying tank, the agent is sprayed out through the spraying tank and mixed with water. At the same time, during the spraying process, the spraying tank is inclined upward from the inside to the outside, so that the agent is sprayed upward. This, combined with the downward flow of water, creates a counter-current. In addition, the partition plate 85 and the guide plate 83 separate the downward flowing water. The inclination of the guide plate 83 guides the water to the position of the spraying tank, improving the mixing effect.

[0046] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0047] 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 nitrite removal and filtration device for aquaculture, characterized in that, include: The frame (1) has a medicine tank (5) installed inside, and a liquid pump (4) is fixedly installed inside the frame (1). A filter tank (2) is installed on top of the frame (1) and is used for preliminary filtration of aquaculture water. The filter box (3) is installed inside the frame (1), and a connecting pipe (6) is installed on the top of the filter box (3). The filter box (3) is connected to the filter tank (2) through the connecting pipe (6). The spraying mechanism (8) is installed inside the filter box (3), and a conduit (11) is fixedly installed at the bottom of the spraying mechanism (8). The end of the conduit (11) away from the spraying mechanism (8) is connected to the liquid outlet of the liquid pump (4). The inner wall of the filter box (3) is fixedly installed with an inner baffle (14). The inner baffle (14) is located outside the spraying mechanism (8). The bottom of the outer side of the inner baffle (14) is evenly provided with slots. The filter box (3) is installed with an outer baffle (10). The upper and lower ends of the outer baffle (10) are fixedly connected to the upper and lower sides of the inner wall of the filter box (3) respectively. The top of the outer side of the outer baffle (10) is evenly provided with slots. The outer baffle (10) is located outside the inner baffle (14) and there is a gap between them. The inner wall of the outer baffle (10) and the outer side of the inner baffle (14) are both fixedly installed with inner ring plates (13). The inner ring plates (13) are staggered and the side that is close to each other is inclined downward. The spraying mechanism (8) includes a conical column (82), the outer diameter of which gradually increases from top to bottom, and a spraying groove is evenly provided on the outer side of the conical column (82), and the spraying groove is inclined downward from the outside to the inside. A column groove is provided at the center of the top of the conical column (82). A connecting pipe (81) is fixedly installed at the bottom of the conical column (82). The connecting pipe (81) communicates with the column groove of the conical column (82), and the bottom end of the connecting pipe (81) is fixedly connected to one end of the guide tube (11). A top plate (84) is fixedly installed at the top of the conical column (82). A sliding column (86) is slidably installed on the inner wall of the top plate (84), and a sliding plate (88) is fixedly installed at the bottom end of the sliding column (86). The bottom of the sliding plate (88) is an arc surface that is concave inward at the center position, and the outer side of the sliding plate (88) is slidably adapted to the groove of the conical column (82). A spring (87) is fixedly installed between the sliding plate (88) and the top plate (84). A partition plate (85) is fixedly installed on the outside of the conical column (82), and the partition plate (85) is evenly installed along the center position of the conical column (82). The partition plate (85) is located between the spraying grooves, and the side of the partition plate (85) away from the conical column (82) is fixedly connected to the inner wall of the inner baffle (14). Guide plates (83) are fixedly installed on both sides of the partition plate (85), and the side of the guide plate (83) away from the partition plate (85) is inclined downward.

2. The nitrite removal and filtration device for aquaculture according to claim 1, characterized in that: The filter box (3) is fixedly installed with a grid cylinder (9) inside. The grid cylinder (9) is located outside the outer baffle cylinder (10). The grid grooves are evenly opened on the outer side of the grid cylinder (9). The filter bag (12) is fixedly installed on the inner wall of the grid cylinder (9). The drain pipe (7) is fixedly installed on the outer side of the filter box (3).

3. The nitrite removal and filtration device for aquaculture according to claim 2, characterized in that: The filter tank (2) includes a tank body (22), and support rings (23) are fixedly installed at both ends of the outer side of the tank body (22). The tank body (22) is fixedly connected to the frame (1) through the support rings (23), and a water inlet pipe (21) is fixedly installed at one end of the tank body (22).

4. The nitrite removal and filtration device for aquaculture according to claim 3, characterized in that: An inner guide tube (24) is fixedly installed at the center of the inner wall of the tank (22). The top of the outer side of the inner guide tube (24) is evenly provided with a circular groove, and both ends of the outer side of the inner guide tube (24) are fixedly installed with end cover plates (25). A grid frame (26) and a top arc cover (27) are fixedly installed between the end cover plates (25).

5. The nitrite removal and filtration device for aquaculture according to claim 4, characterized in that: The grid frame (26) is located on both sides of the top arc cover (27), and the top arc cover (27) has a frame groove on both sides, and the grid frame (26) has a space for filling activated carbon inside.

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