Device and method for purifying content of nitrite nitrogen in penaeus vannamei aquaculture water
By designing a device including a purification box and a nitrite degrader in the water body of the white shrimp farm in South America, the problem of long and low purification in the prior art is solved, and efficient nitrogen purification and tail water recycling are achieved, reducing the efficiency of nitrogen purification and sluggish water. Environmental pollution pressure.
Patent Information
- Application Number
- CN202411229030.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-03
- Publication Date
- 2024-12-10
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
The purification of nitroso nitrogen in the waters of white shrimps in the Central and South America is long and has low purification efficiency, resulting in high pressure on the discharge of aquaculture tail water and environmental pollution.
A device including a purification box, mud guide plate, gas separation plate, stirring strip, oxygen generator and nitrite degrader storage box was designed. The dissolved oxygen was increased through stirring and oxygen injection, combined with the use of nitrite degrader , rapidly purify nitroso nitrogen in water.
It significantly improves the purification efficiency of nitroso nitrogen, realizes the recycling of aquaculture tail water, and reduces water resource consumption and environmental pollution.
Smart Images
Figure CN119096935A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of Penaeus vannamei culture, and in particular to a device and method for purifying the nitrite nitrogen content in Penaeus vannamei culture water. Background Art
[0002] The white shrimp is mainly distributed along the Pacific coast of America. It is the main aquaculture species in Ecuador and other American countries. It is also cultivated in the Yellow Sea and Bohai Sea of China. The white shrimp is a tropical shrimp with wide temperature and salt content, and often lives on the muddy seabed. During the day, it crawls or lurks on the surface of the seabed, and is active at night. Adult shrimps mostly live in coastal waters close to the shore, while young shrimps like to forage and grow in estuaries rich in bait organisms. After a period of cultivation of white shrimp, nitrite nitrogen will be produced in the water. In order not to affect the cultivation, it is often necessary to use purification equipment to purify the nitrite nitrogen in the water.
[0003] In the prior art, Chinese patent publication number CN115571983A discloses a simultaneous nitrification and denitrification denitrification device and treatment method, the device includes a bioreactor, a plurality of circular brackets are concentrically arranged in the bioreactor, a plurality of microporous aeration membrane filaments and an anaerobic biological fixed bed are arranged on the circular brackets at intervals, a plurality of ammonia nitrogen adsorption biological carriers are evenly distributed on the microporous aeration membrane filaments, and a plurality of filamentous biological carriers are arranged on the anaerobic biological fixed bed.
[0004] The existing technology is similar to the above-mentioned denitrification device, which only purifies ammonia nitrogen and nitric nitrogen in water by introducing oxygen to form a micro-aerobic environment. The purification reaction process takes a lot of time and has low purification efficiency, so there is room for improvement. Summary of the invention
[0005] The purpose of the present invention is to solve the shortcomings of the prior art that the purification process takes a long time and has low purification efficiency, and to propose a device and method for purifying the nitrite nitrogen content in the water body of Penaeus vannamei culture. The advantages of the present invention are that the purification efficiency of nitrite nitrogen in the water body of Penaeus vannamei culture is improved, and the tail water of culture can be recycled to reduce the discharge of tail water of culture. The present invention can not only save water resources, but also reduce the pressure of environmental pollution caused by the discharge of tail water.
[0006] In order to achieve the above object, the present invention adopts the following technical solutions:
[0007] A device for purifying the nitrite nitrogen content in the water body for breeding whiteleg shrimp, comprising a purification box, a water inlet pipe is arranged on one side of the purification box, a water pump is arranged on the outer wall of the other side of the purification box, a water pump is arranged on the input end of the water pump, the water pump extends into the purification box at one end away from the water pump, a mud guide plate is arranged on the inner wall of the purification box, a rotating hole is opened at the middle position of the top of the mud guide plate, a rotating tube is rotatably connected to the inner wall of the rotating hole, a gas distribution plate is arranged on the top of the rotating tube, the gas distribution plate is connected to the rotating tube, a plurality of equidistant annularly distributed gas distribution pipes are arranged on the outer walls around the gas distribution plate, a plurality of equidistantly distributed oxygen supply heads are arranged on the top of the gas distribution pipes, and the gas distribution pipes are close to the supply A plurality of stirring bars distributed at equal distances are arranged on the top of one side of the oxygen head, a motor and an oxygen generator are arranged on the inner wall at the bottom of the purification box, the output shaft of the motor is transmission-connected to the rotating tube through a pulley, an inflation tube is connected to the output end of the oxygen generator, and the inflation tube is rotationally connected to the inside of the rotating tube through a bearing, a guide block is arranged on the top of the gas distribution plate, a stirring ring is arranged on the top of the guide block, a plurality of mounting rods distributed at equal distances are arranged on the top of the stirring ring, a stirring blade is arranged on the outer wall of the mounting rod, a nitrite degradation agent storage box is arranged on the top of the purification box, a discharge barrel is arranged at the bottom of the nitrite degradation agent storage box, and a feeding door is arranged on the top of the nitrite degradation agent storage box.
[0008] The present invention is further configured such that the stirring bar is in an S-shaped structure. The S-shaped structure can increase the contact area between the stirring bar and the water body, thereby improving the stirring effect on the water body.
[0009] The present invention is further configured such that the outer wall of the stirring bar is provided with a plurality of equally spaced anti-blocking wires, the anti-blocking wires being made of plastic. The anti-blocking wires can block some floating impurities such as shrimp whiskers in the water body, thereby preventing the impurities from blocking the oxygen supply head.
[0010] The present invention is further configured such that a sedimentation collection box is provided on both sides of the purification box, and the sedimentation collection box is connected to the purification box through a mud leakage port. When the tail water enters the purification box, the sludge in the tail water can be precipitated, and the sludge flows along the mud guide plate and the mud leakage port into the sedimentation collection box, thereby removing the sludge in the water body, thereby improving the purification effect of the water body.
[0011] The present invention is further configured such that a limit frame is provided on the inner wall of the sediment collection box near the purification box, and a mud guard is slidably connected to the inner wall of the limit frame, and the mud guard blocks the mud leakage port. When collecting sediment, the mud guard is pulled upward by hand, and the mud guard is moved away from the mud leakage port, and the sediment in the water body can enter the sediment collection box along the mud leakage port, thereby improving the convenience of use.
[0012] The present invention is further configured such that a plurality of stirring rods are arranged at equal distances at the bottom of the gas distribution pipe, and the length of the stirring rods gradually shortens from the periphery to the middle. The arrangement of the stirring rods can stir the sediment at the bottom of the water body, facilitate the removal of nitrite nitrogen in the sediment, and improve the purification quality of the water body.
[0013] The present invention is further configured such that the two ends of the mud guide plate are inclined, and the lowest end of the mud guide plate faces the mud leakage port. The mud guide plate with inclined ends facilitates the sediment to fall along the mud guide plate, thereby improving the efficiency of sediment collection.
[0014] The present invention is further configured such that the inner wall of the discharge barrel is slidably connected with a blocking block, the blocking block is connected to the inner wall of the bottom of the discharge barrel by a return spring, a push rod is provided on the top of the blocking block, a button is provided on the top of the push rod, both sides of the discharge barrel are provided with discharge holes, and a discharge shell is provided at the bottom of the discharge barrel. When it is necessary to add nitrite degrading agent, the button is pressed downward by hand, and the button drives the blocking block to move downward through the push rod. When the blocking block is removed from the discharge hole, the nitrite degrading agent in the discharge barrel can enter the purification box along the discharge hole and the discharge shell, thereby improving the convenience of adding the nitrite degrading agent. The discharge shell can concentrate the nitrite degrading agent in the middle, making it convenient for the nitrite degrading agent to be crushed and dissolved in the water by the stirring blade.
[0015] The present invention is further configured such that both inner walls of the discharge barrel below the blocking block are provided with limit blocks. When the blocking block moves downward, the limit blocks can block the blocking block, thereby preventing the blocking block from moving too much and causing the nitrite degradation agent to be unable to smoothly enter the discharge hole, thereby improving the convenience of discharge.
[0016] A method for using a device for purifying nitrite nitrogen content in water for breeding white shrimp comprises the following steps:
[0017] Step 1: When in use, add the tail water of Penaeus vannamei culture that needs to be purified into the purification box through the water inlet pipe;
[0018] Step 2: Control the oxygen generator and the motor to work. The motor drives the rotating tube to rotate, and the rotating tube drives the gas distribution plate to rotate. The stirring bar, stirring ring and stirring blade stir the tail water. The oxygen generator works to generate oxygen. The oxygen enters the water body from the oxygen supply head through the gas distribution plate and the gas distribution pipe, increasing the dissolved oxygen content in the water and promoting the respiratory metabolic activities of aquatic organisms.
[0019] Step 3: At the same time, the discharge barrel is opened, and the nitrite degrading agent in the nitrite degrading agent storage box enters the purification box along the discharge barrel. After the nitrite degrading agent falls, the rapidly rotating stirring blade breaks up the nitrite degrading agent, so that the nitrite degrading agent can be quickly dissolved in the water body to react, reduce nitrite nitrogen into nitrogen gas, and then purify the nitrite nitrogen in the water body;
[0020] Step 4: After purification, the water pump works to pump out the purified seawater again for whiteleg shrimp farming.
[0021] The beneficial effects of the present invention are:
[0022] 1. The device for purifying the nitrite nitrogen content in the water body of Penaeus vannamei culture is used to add the tail water of Penaeus vannamei culture to be purified into the purification box through the water inlet pipe, control the oxygen generator and the motor to work, the motor drives the rotating tube to rotate, the rotating tube drives the gas distribution plate to rotate, the stirring bar, the stirring ring and the stirring blade stir the tail water, the oxygen generator works to generate oxygen, the oxygen passes through the gas distribution plate and the gas distribution pipe from the oxygen supply head into the water body, increases the dissolved oxygen content in the water, promotes the respiratory metabolic activities of aquatic organisms, and enhances the self-purification ability of the water body. At the same time, open the feeding The nitrite degradation agent in the nitrite degradation agent storage box enters the purification box along the discharge barrel. After the nitrite degradation agent falls, the rapidly rotating stirring blade breaks the nitrite degradation agent, so that the nitrite degradation agent can be quickly dissolved in the water body to react, and the nitrite nitrogen is reduced to nitrogen gas, and then the nitrite nitrogen in the water body is purified. After purification, the water pump works to re-extract the purified tail water for white shrimp farming, thereby improving the purification efficiency of nitrite nitrogen in the white shrimp farming water body, and the farming tail water can be recycled to reduce the discharge of farming tail water. The present invention can not only save water resources, but also reduce the pressure of environmental pollution caused by the discharge of tail water.
[0023] 2. The device for purifying the nitrite nitrogen content in the water body for breeding white shrimp can block some floating impurities such as shrimp whiskers in the water body with anti-blocking wires to prevent the impurities from blocking the oxygen supply head; when the tail water enters the purification box, the sludge in the tail water can be precipitated, and the sludge flows along the mud guide plate and the mud leakage port into the sedimentation collection box, thereby removing the sludge in the water body and improving the purification effect of the water body; when collecting the sediment, the mud guard is pulled upward by hand, and the mud guard is moved away from the mud leakage port, and the sediment in the water body can flow along the mud leakage port into the sedimentation collection box, thereby improving the convenience of use.
[0024] 3. The device for purifying the nitrite nitrogen content in the water body for breeding white shrimps, when it is necessary to add nitrite degrading agent, the button is pressed downward by hand, and the button drives the blocking block to move downward through the pressing rod, and when the blocking block is removed from the feeding hole, the nitrite degrading agent in the feeding barrel can enter the purification box along the feeding hole and the feeding shell, thereby improving the convenience of adding the nitrite degrading agent, and the feeding shell can concentrate the nitrite degrading agent to the middle, so that the nitrite degrading agent is conveniently crushed and dissolved in the water body by the stirring blade; when the blocking block moves downward, the limiting block can block the blocking block, so as to avoid the situation that the nitrite degrading agent cannot smoothly enter the feeding hole due to excessive movement of the blocking block, thereby improving the convenience of feeding. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Figure 1 This is a schematic diagram of the three-dimensional structure of a device for purifying the nitrite nitrogen content in the water body for breeding Penaeus vannamei proposed by the present invention;
[0026] Figure 2 This is a schematic cross-sectional view of a device for purifying nitrite nitrogen content in water for breeding Penaeus vannamei proposed by the present invention;
[0027] Figure 3 This is a schematic diagram of the main structure of an aeration mechanism of a device for purifying the nitrite nitrogen content in the water body for breeding Penaeus vannamei proposed by the present invention;
[0028] Figure 4 This is a schematic diagram of the three-dimensional structure of an aeration mechanism of a device for purifying the nitrite nitrogen content in the water body for breeding Penaeus vannamei proposed by the present invention;
[0029] Figure 5 for Figure 2 A schematic diagram of the enlarged structure at A in the middle;
[0030] Figure 6 for Figure 3 Schematic diagram of the enlarged structure at point B in the middle.
[0031] In the figure: 1. water pump; 2. nitrite degradation agent storage box; 3. button; 4. feeding door; 5. purification box; 6. water inlet pipe; 7. sediment collection box; 8. mud guard; 9. push rod; 10. limit frame; 11. gas distributor; 12. mud guide plate; 13. mud leakage port; 14. motor; 15. inflation pipe; 16. oxygen generator; 17. rotating pipe; 18. guide block; 19. installation rod; 20. stirring blade; 21. stirring ring; 22. gas distributor; 23. mud stirring rod; 24. discharge shell; 25. limit block; 26. blocking block; 27. discharge hole; 28. discharge barrel; 29. reset spring; 30. oxygen supply head; 31. stirring bar; 32. anti-blocking wire. DETAILED DESCRIPTION
[0032] The technical solution of this patent is further described in detail below in conjunction with specific implementation methods.
[0033] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.
[0034] In the description of this patent, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing this patent and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this patent.
[0035] In the description of this patent, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, it can be fixedly connected or set, or it can be detachably connected or set, or connected or set in one piece. For ordinary technicians in this field, the specific meanings of the above terms in this patent can be understood according to specific circumstances.
[0036] Reference Figure 1-6A device for purifying the nitrite nitrogen content in the water body for breeding whiteleg shrimp comprises a purification box 5, a water inlet pipe 6 is arranged on one side of the purification box 5, a water pump 1 is arranged on the outer wall of the other side of the purification box 5, a water pump 1 is arranged on the input end of the water pump 1, and the end of the water pump 1 away from the water pump 1 extends into the purification box 5, a mud guide plate 12 is arranged on the inner wall of the purification box 5, a rotating hole is opened at the middle position of the top of the mud guide plate 12, a rotating tube 17 is rotatably connected to the inner wall of the rotating hole, a gas distribution plate 11 is arranged on the top of the rotating tube 17, the gas distribution plate 11 is connected to the rotating tube 17, a plurality of equidistantly distributed gas distribution pipes 22 are arranged on the outer wall around the gas distribution plate 11, a plurality of equidistantly distributed oxygen supply heads 30 are arranged on the top of the gas distribution pipe 22, and a side of the gas distribution pipe 22 close to the oxygen supply head 30 is provided. A plurality of stirring bars 31 distributed at equal distances are arranged on the top of the purification box 5, a motor 14 and an oxygen generator 16 are arranged on the inner wall of the bottom, the output shaft of the motor 14 is transmission-connected to the rotating tube 17 through a pulley, the output end of the oxygen generator 16 is connected to the inflation tube 15, and the inflation tube 15 is rotationally connected to the inside of the rotating tube 17 through a bearing, a guide block 18 is arranged on the top of the gas distribution plate 11, a stirring ring 21 is arranged on the top of the guide block 18, a plurality of mounting rods 19 distributed at equal distances are arranged on the top of the stirring ring 21, and a stirring blade 20 is arranged on the outer wall of the mounting rod 19, a nitrite degradation agent storage box 2 is arranged on the top of the purification box 5, a discharge barrel 28 is arranged at the bottom of the nitrite degradation agent storage box 2, and a feeding door 4 is arranged on the top of the nitrite degradation agent storage box 2.
[0037] In this embodiment, the stirring bar 31 has an S-shaped structure; the S-shaped structure can increase the contact area between the stirring bar 31 and the water body, thereby improving the stirring effect on the water body; the outer wall of the stirring bar 31 is provided with a plurality of equally distributed anti-blocking wires 32, and the anti-blocking wires 32 are made of plastic. The anti-blocking wires 32 can block some floating impurities such as shrimp whiskers in the water body, thereby preventing the impurities from blocking the oxygen supply head 30.
[0038] Furthermore, sedimentation collection boxes 7 are provided on both sides of the purification box 5, and the sedimentation collection boxes 7 are connected with the purification box 5 through the mud leakage port 13. When the tail water enters the purification box 5, the sludge in the tail water can be precipitated, and the sludge enters the sedimentation collection box 7 along the mud leakage port 13 along the mud guide plate 12, and then the sludge in the water body can be removed, thereby improving the purification effect of the water body; a limit frame 10 is provided on the inner wall of the sedimentation collection box 7 close to the purification box 5, and a mud guard 8 is slidably connected to the inner wall of the limit frame 10, and the mud guard 8 blocks the mud leakage port 13. When collecting sediment, the mud guard 8 is pulled upward by hand, and the mud guard 8 is removed from the mud leakage port 13, and the sediment in the water body can enter the sedimentation collection box 7 along the mud leakage port 13, thereby improving the convenience of use.
[0039] A plurality of equidistantly distributed mud stirring rods 23 are provided at the bottom of the gas distribution pipe 22. The length of the mud stirring rods 23 gradually shortens from the periphery to the middle. The mud stirring rods 23 can stir the sediment at the bottom of the water body, so that the nitrite nitrogen in the sediment can be removed conveniently, thereby improving the purification quality of the water body. The two ends of the mud guide plate 12 are inclined, and the lowest end of the mud guide plate 12 faces the mud leakage port 13. The mud guide plates 12 with inclined ends are convenient for the sediment to fall along the mud guide plates 12, thereby improving the efficiency of sediment collection.
[0040] It is worth mentioning that the inner wall of the discharge barrel 28 is slidably connected with a blocking block 26, and the blocking block 26 is connected to the inner wall of the bottom of the discharge barrel 28 by a return spring 29. A pressing rod 9 is arranged on the top of the blocking block 26, and a button 3 is arranged on the top of the pressing rod 9. Discharge holes 27 are provided on both sides of the discharge barrel 28, and a discharge shell 24 is arranged at the bottom of the discharge barrel 28. When it is necessary to add nitrite degradation agent, the button 3 is pressed downward by hand, and the button 3 drives the blocking block 26 to move downward through the pressing rod 9. When the blocking block 26 is removed from the discharge hole 27, the nitrite in the discharge barrel 28 is degraded. The agent can enter the purification box 5 along the discharge hole 27 and the discharge shell 24, which improves the convenience of adding nitrite degradation agent. The discharge shell 24 can concentrate the nitrite degradation agent to the middle, which is convenient for the nitrite degradation agent to be crushed and dissolved in the water by the stirring blade 20; the inner walls of the discharge barrel 28 on both sides below the blocking block 26 are provided with limit blocks 25; when the blocking block 26 moves downward, the limit block 25 can block the blocking block 26 to avoid the situation where the blocking block 26 moves too much and the nitrite degradation agent cannot smoothly enter the discharge hole 27, thereby improving the convenience of discharge.
[0041] A method for using a device for purifying nitrite nitrogen content in water for breeding white shrimp comprises the following steps:
[0042] Step 1: When in use, add the tail water of Penaeus vannamei culture that needs to be purified into the purification box 5 through the water inlet pipe 6;
[0043] Step 2: Control the oxygen generator 16 and the motor 14 to work. The motor 14 drives the rotating tube 17 to rotate. The rotating tube 17 drives the gas distribution plate 11 to rotate. The stirring bar 31, the stirring ring 21 and the stirring blade 20 stir the tail water. The oxygen generator 16 works to generate oxygen. The oxygen enters the water body from the oxygen supply head 30 through the gas distribution plate 11 and the gas distribution pipe 22, thereby increasing the dissolved oxygen content in the water and promoting the respiratory metabolic activities of aquatic organisms.
[0044] Step 3: At the same time, the discharge barrel 28 is opened, and the nitrite degradation agent in the nitrite degradation agent storage box 2 enters the purification box 5 along the discharge barrel 28. After the nitrite degradation agent falls, the rapidly rotating stirring blade 20 breaks up the nitrite degradation agent, so that the nitrite degradation agent can be quickly dissolved in the water body to react, reduce nitrite nitrogen into nitrogen gas, and then purify the nitrite nitrogen in the water body;
[0045] Step 4: After purification, the pump 1 works to pump out the purified tail water again for Penaeus vannamei farming.
[0046] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.
Claims
1. A device for purifying the nitrite nitrogen content in water for breeding white shrimp, comprising a purification box (5), a water inlet pipe (6) is arranged on one side of the purification box (5), a water pump (1) is arranged on the outer wall of the other side of the purification box (5), a water pump (1) is arranged at the input end of the water pump (1), and the end of the water pump (1) away from the water pump (1) extends into the purification box (5), characterized in that: The inner wall of the purification box (5) is provided with a mud guide plate (12), a rotating hole is provided at the middle position of the top of the mud guide plate (12), the inner wall of the rotating hole is rotatably connected with a rotating tube (17), a gas distribution plate (11) is provided on the top of the rotating tube (17), the gas distribution plate (11) is connected with the rotating tube (17), a plurality of gas distribution pipes (22) distributed in an annular manner with equal distances are provided on the outer wall around the gas distribution plate (11), a plurality of oxygen supply heads (30) distributed in an equal distances are provided on the top of the gas distribution pipe (22), a plurality of stirring bars (31) distributed in an equal distances are provided on the top of the gas distribution pipe (22) close to the oxygen supply head (30), a motor (14) and an oxygen generator (16) are provided on the inner wall of the bottom of the purification box (5), the output of the motor (14) The output shaft is connected to the rotating tube (17) through a pulley, the output end of the oxygen generator (16) is connected to the inflation tube (15), and the inflation tube (15) is rotatably connected to the inside of the rotating tube (17) through a bearing. The top of the gas distribution plate (11) is provided with a guide block (18), the top of the guide block (18) is provided with a stirring ring (21), the top of the stirring ring (21) is provided with a plurality of mounting rods (19) distributed at equal distances, and the outer wall of the mounting rod (19) is provided with a stirring blade (20), the top of the purification box (5) is provided with a nitrite degradation agent storage box (2), the bottom of the nitrite degradation agent storage box (2) is provided with a discharge barrel (28), and the top of the nitrite degradation agent storage box (2) is provided with a feeding door (4).
2. The device for purifying nitrite nitrogen content in water for breeding Penaeus vannamei according to claim 1, characterized in that: The stirring bar (31) has an S-shaped structure.
3. A device for purifying nitrite nitrogen content in water for breeding Penaeus vannamei according to claim 2, characterized in that: The outer wall of the stirring bar (31) is provided with a plurality of anti-blocking wires (32) distributed at equal distances, and the anti-blocking wires (32) are made of plastic material.
4. The device for purifying nitrite nitrogen content in water for breeding Penaeus vannamei according to claim 1, characterized in that: Sediment collection boxes (7) are provided on both sides of the purification box (5), and the sediment collection boxes (7) are connected to the purification box (5) through a mud leakage port (13).
5. The device for purifying nitrite nitrogen content in water for breeding Penaeus vannamei according to claim 4, characterized in that: A limit frame (10) is provided on the inner wall of the sedimentation collection box (7) on the side close to the purification box (5), and a mud guard (8) is slidably connected to the inner wall of the limit frame (10), and the mud guard (8) blocks the mud leakage port (13).
6. The device for purifying nitrite nitrogen content in water for breeding Penaeus vannamei according to claim 1, characterized in that: A plurality of stirring rods (23) are arranged at equal distances at the bottom of the gas distribution pipe (22), and the length of the stirring rods (23) gradually shortens from the periphery to the middle.
7. The device for purifying nitrite nitrogen content in water for breeding Penaeus vannamei according to claim 6, characterized in that: The two ends of the mud guide plate (12) are arranged obliquely, and the lowest end of the mud guide plate (12) faces the mud leakage port (13).
8. The device for purifying nitrite nitrogen content in water for breeding Penaeus vannamei according to claim 1, characterized in that: The inner wall of the discharge barrel (28) is slidably connected with a blocking block (26), and the blocking block (26) is connected to the inner wall of the bottom of the discharge barrel (28) via a return spring (29). A push rod (9) is arranged on the top of the blocking block (26), and a button (3) is arranged on the top of the push rod (9). Discharge holes (27) are provided on both sides of the discharge barrel (28), and a discharge shell (24) is arranged at the bottom of the discharge barrel (28).
9. The device for purifying nitrite nitrogen content in water for breeding Penaeus vannamei according to claim 8, characterized in that: Limit blocks (25) are provided on both inner walls of the lower barrel (28) below the blocking block (26).
10. A method for using the device for purifying nitrite nitrogen content in water for breeding Penaeus vannamei as claimed in claim 1, characterized in that: The following steps are involved: Step 1: When in use, the tail water of Penaeus vannamei culture that needs to be purified is added into the purification box (5) through the water inlet pipe (6); Step 2: Control the oxygen generator (16) and the motor (14) to work, the motor (14) drives the rotating tube (17) to rotate, the rotating tube (17) drives the gas distribution plate (11) to rotate, the stirring bar (31), the stirring ring (21) and the stirring blade (20) stir the tail water, the oxygen generator (16) works to generate oxygen, the oxygen passes through the gas distribution plate (11) and the gas distribution pipe (22) and enters the water body from the oxygen supply head (30), thereby increasing the dissolved oxygen content in the water and promoting the respiratory metabolic activities of aquatic organisms; Step 3: At the same time, the discharge barrel (28) is opened, and the nitrite degrading agent in the nitrite degrading agent storage box (2) enters the purification box (5) along the discharge barrel (28). After the nitrite degrading agent falls, the rapidly rotating stirring blade (20) breaks up the nitrite degrading agent, so that the nitrite degrading agent can be quickly dissolved in the water body to react, reduce nitrite nitrogen into nitrogen gas, and then purify the nitrite nitrogen in the water body; Step 4: After purification, the water pump (1) works to pump out the purified tail water again for Penaeus vannamei farming.