Integrated device for denitrification and dephosphorization of mariculture tail water

Abstract

The application belongs to the technical field of wastewater treatment, and discloses a seawater breeding tail water denitrification and phosphorus removal integrated device. The device aims to solve the technical problems of fixed baffle plate in seawater breeding tail water treatment device and shutdown for packing replacement in the prior art. The device comprises a horizontal box body of a square frame and a top cover. Water distribution inlets and water outlets are arranged on the two side end faces of the horizontal box body. The height of the water outlet is lower than that of the water distribution inlet. A movable baffle plate group is arranged in the horizontal box body. A packing box is detachably connected between the baffle plate group. The baffle plate group is divided into multiple function areas with S-shaped baffling through the baffle plate group with a deflectable angle. The rotation connection of the baffle plate group 20, the deflection pull rod and the limiting bolt can be used to adjust the inclination angle in the range of 0°~30°. Therefore, the inclination angle of the baffle plate group can be adjusted to adapt to the changes of different water quality and hydraulic load, and the denitrification and phosphorus removal treatment effect is stable.

Description

Technical Field

[0001] This invention relates to the technical field of wastewater treatment, and particularly to an integrated device for denitrification and phosphorus removal from marine aquaculture tailwater. Background Technology

[0002] Marine aquaculture is an important aquaculture method that utilizes nutrients in seawater to cultivate seafood such as fish, shellfish, and shrimp. However, marine aquaculture generates a large amount of wastewater, which is rich in pollutants such as organic matter, ammonia nitrogen, nitrates, and phosphates. If discharged directly without effective treatment, it will lead to eutrophication of nearshore waters and damage the marine ecosystem.

[0003] Currently, the main treatment unit for nitrogen and phosphorus removal in marine aquaculture wastewater is the baffled biofilm reactor. This type of device divides the reactor into multiple functional zones (such as aerobic, anoxic, and anaerobic zones) by installing baffles within the tank. The wastewater flows sequentially through these zones along the baffle channels, where nitrogen and phosphorus removal is achieved through the action of biofilms or packing materials.

[0004] Most of the baffles in these systems are fixed structures. When the concentration of pollutants in the influent or the hydraulic load fluctuates, they cannot enhance mass transfer or reduce head loss by changing the flow state, resulting in poor resistance to shock loads and unstable effluent quality. At the same time, the packing material is often directly piled up or fixedly installed in the tank. After long-term operation, it is prone to caking and blockage. Once the consumable packing material is exhausted, the system must be shut down and the tank emptied before it can be replaced. This operation is cumbersome and affects the continuity of aquaculture production. Therefore, there is an urgent need for a mechanical structure that can both adjust hydraulic conditions online and replace packing material online. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide an integrated denitrification and phosphorus removal device for marine aquaculture tailwater. It aims to solve the technical problems of fixed and non-adjustable baffle plates and the need to stop the machine to replace the packing in the prior art marine aquaculture tailwater treatment device.

[0006] To achieve the above objectives, the present invention proposes an integrated nitrogen and phosphorus removal device for marine aquaculture tailwater, comprising a horizontal box body with a square frame and a top cover. The horizontal box body has a water distribution port and a water outlet on both sides. The height of the water outlet is lower than that of the water distribution port. At least two movable baffle groups are arranged at intervals inside the horizontal box body. A packing box is detachably snapped between the baffle groups.

[0007] The baffle assembly divides the horizontal box into multiple functional areas. The baffle assembly includes an upper baffle and a lower baffle. Water flows through the top of the upper baffle, and there is a gap between the top of the upper baffle and the top of the box. Water flows through the bottom of the lower baffle, and there is a gap between the bottom of the lower baffle and the bottom of the box.

[0008] The bottom of each baffle assembly is rotatably connected to the inner wall of the horizontal tank via a hinge shaft. The top of the baffle assembly is also hinged with a deflection rod, which extends to the outside of the horizontal tank and is equipped with a locking device to adjust and lock the tilt angle of the baffle assembly relative to the water flow direction to adapt to different water qualities and hydraulic loads.

[0009] Preferably, the multiple functional areas of the baffle plate group are arranged sequentially from the water distribution port to the water outlet as a primary area, a secondary area and a tertiary area, and each area is provided with at least two layers of packing boxes;

[0010] The water inlet pattern of the first-level zone is bottom inlet and top outlet, the second-level zone is top inlet and bottom outlet, and the third-level zone is bottom inlet and top outlet, forming an S-shaped flow channel.

[0011] Preferably, the bottom of the upper baffle of the baffle assembly is sealed to the bottom of the horizontal box, and the baffle assembly is uniformly deflected in the direction of water flow, with a rotation angle of 0-30°.

[0012] Preferably, the baffle assembly has rotating cavities for locking rods on both sides, and a main locking rod is provided between the rotating cavities of the locking rods of two adjacent baffle assemblies for installing the stuffing box.

[0013] Preferably, the two sides of the main clamping rod are rotatably connected to the inner wall of the clamping rod rotating cavity via a rotating shaft through a semi-circular arc surface, and the arc radius of the clamping rod rotating cavity is larger than the semi-circular arc radius of the main clamping rod.

[0014] Preferably, the inner end face of the main clamping rod is provided with a clamping groove, and a buckle structure is formed at both ends of the main clamping rod. The bottom of the buckle structure extends inward and the top extends obliquely upward inward, which is used to clamp the packing box.

[0015] Preferably, the locking component includes a limiting bolt, the deflection rod is installed on the top of the baffle assembly, and the connection between the two is provided with a rotational margin for the deflection of the baffle assembly. The deflection rod extends to the outside on one side of the outlet, and the limiting bolt is provided at the outer end of the deflection rod.

[0016] Preferably, the horizontal box body has at least two limiting screw holes on one end face of the outlet, and the limiting bolts cooperate with the limiting screw holes to lock the tilt angle of the baffle assembly.

[0017] Preferably, the interior of the stuffing box is hollow, and through holes are provided at the top and bottom. The hollow interior of the stuffing box is filled with denitrification and phosphorus removal packing.

[0018] The stuffing box is fixed with auxiliary snap-fit ​​rods on both sides for snap-fit ​​connection between the baffle assembly.

[0019] Preferably, each main functional area of ​​the horizontal box is provided with a sludge collection trough at the bottom, and the side of the horizontal box is also provided with a drain valve corresponding to and connected to the sludge collection trough for draining sewage.

[0020] Preferably, each main functional area of ​​the horizontal box is provided with a sludge collection trough at the bottom, and the side of the horizontal box is also provided with a drain valve corresponding to and connected to the sludge collection trough for draining sewage.

[0021] Compared with existing technologies, the beneficial effects of the integrated nitrogen and phosphorus removal device for marine aquaculture tailwater provided by this invention are as follows:

[0022] 1. A multi-stage functional zone with S-shaped baffles is created by a baffle assembly with adjustable angles. The rotating connection of the baffle assembly 20, along with the deflection rod and limit bolts, allows for arbitrary adjustment of the tilt angle within the range of 0° to 30°. When the influent pollutant concentration is high, increasing the tilt angle can increase local turbulence and eddies, enhancing mass transfer efficiency. When the influent flow rate is large or the packing resistance increases, decreasing the tilt angle can reduce head loss and ensure smooth gravity flow. Therefore, by adjusting the tilt angle of the baffle assembly, it can flexibly adapt to changes in influent water quality and hydraulic load, ensuring stable nitrogen and phosphorus removal treatment effects.

[0023] 2. The quick-release stuffing box allows for rapid installation, disassembly, and replacement of the stuffing. This process does not require stopping the equipment for drainage, reducing the maintenance difficulty and operating costs of the device. At the same time, the entire process relies on gravity flow, eliminating the need for additional power propulsion equipment and resulting in lower energy consumption.

[0024] 3. The S-shaped baffle channel formed by the alternating arrangement of the upper and lower flow plates effectively extends the water flow path and hydraulic residence time without increasing the footprint of the device, thereby improving the treatment efficiency of each functional area.

[0025] The features and advantages of the present invention will be described in detail through embodiments and in conjunction with the accompanying drawings. Attached Figure Description

[0026] Figure 1 This is a perspective view of an embodiment of the present invention.

[0027] Figure 2 This is a half-sectional view of an embodiment of the present invention.

[0028] Figure 3 This is an internal structural view of an embodiment of the present invention.

[0029] Figure 4 This is the present invention. Figure 3 A magnified view of point A in the middle.

[0030] Figure 5 This is a view of the baffle assembly according to an embodiment of the present invention.

[0031] Figure 6 This is a view of the baffle plate according to an embodiment of the present invention.

[0032] Figure 7 This is a view of the stuffing box according to an embodiment of the present invention.

[0033] Figure 8 This is a view of the main / sub connector rods according to an embodiment of the present invention.

[0034] Figure 9 This is a view of the main connecting rod in an embodiment of the present invention.

[0035] In the diagram: 10. Horizontal box; 101. Sludge collection trough; 102. Limiting screw hole; 11. Top cover; 12. Water distribution port; 13. Water outlet; 14. Sewage valve; 15. Aeration pipe; 20. Baffle plate assembly; 201. Snap-fit ​​rod rotating cavity; 21. Deflection tie rod; 22. Limiting bolt; 23. Main snap-fit ​​rod; 231. Snap-fit ​​groove; 30. Packing box; 31. Secondary snap-fit ​​rod. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0037] In the description of this invention, it should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to or indirectly connected to the other element.

[0038] In the description of this invention, it should be noted that the terms "center," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying opposing importance. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. "Several" means one or more, unless otherwise explicitly specified.

[0039] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0040] See Figure 1-9 This invention provides an integrated denitrification and phosphorus removal device for seawater aquaculture tailwater, comprising a horizontal box 10 with a square frame and a top cover 11. The horizontal box 10 has water distribution ports 12 and water outlets 13 on both sides, with the outlets 13 being lower than the water distribution ports 12. The horizontal box 10 contains movable baffle groups 20, and multiple packing boxes 30 are arranged between the baffle groups 20. The packing boxes 30 are hollow inside, preferably two in each area, and have through holes at the top and bottom. The hollow interior of the packing boxes 30 is filled with denitrification and phosphorus removal packing. In the primary zone, the upper packing is suspended biological packing (loaded with nitrifying bacteria), and the lower layer can be porous ceramic rings. In the secondary zone, the upper packing can be sulfur / pyrite composite particles (sulfur autotrophic denitrification), and the lower layer can be slow-release carbon source packing (plant straw / PLA). In the tertiary zone, the upper packing can be iron-based phosphorus removal packing (zero-valent iron / siderite), and the lower layer can be zeolite / oyster shell composite packing. Sub-clamping rods 31 are fixed on both sides of the stuffing box 30 for snap-fit ​​connection between the baffle assembly 20.

[0041] The baffle assembly 20 divides the interior of the horizontal tank 10 into three main functional areas. The baffle assembly 20 includes an upper baffle and a lower baffle. Water flows through the top of the upper baffle, leaving a gap between the top and the top of the tank. Water flows through the bottom of the lower baffle, leaving a gap between the bottom and the bottom of the tank. The bottom of each baffle assembly 20 is rotatably connected to the inner wall of the horizontal tank 10 via a hinge shaft. The top of the baffle assembly 20 is also hinged with a deflection rod 21. The deflection rod 21 extends to the outside of the horizontal tank 10 and is equipped with a locking component. This locking component is used to adjust and lock the tilt angle of the baffle assembly 20 to adapt to different water qualities and hydraulic loads. The locking component is used to lock the baffle assembly at the target tilt angle to resist water flow impact and maintain stable hydraulic conditions. The locking component includes, but is not limited to, the matching structure of the limit bolt and the limit screw hole. When the tilt angle of the baffle assembly 20 is adjusted, the cross-sectional area of ​​the three main functional areas changes accordingly, and the hydraulic residence time can also be adjusted accordingly, thus flexibly matching changes in the concentration of pollutants in the influent and ensuring that the denitrification and phosphorus removal effects remain stable. After the baffle assembly 20 is rotated and adjusted, it is fixed by engaging with the pre-set slot on the inner wall of the horizontal tank 10 through the deflection rod 21, thereby locking the current tilt angle. The operation is simple and convenient, and the adjustment can be completed without the need for additional tools.

[0042] The three main functional areas of the baffle plate group 20, from the water distribution port 12 to the water outlet 13, are the primary zone, the secondary zone, and the tertiary zone, respectively. Each zone is equipped with at least two layers of packing boxes 30. The water inlet of the primary zone is bottom inlet and top outlet, the secondary zone is top inlet and bottom outlet, and the tertiary zone is bottom inlet and top outlet, forming an S-shaped baffle channel. The bottom of the primary zone is also equipped with an aeration pipe 15, and the bottom of the secondary zone is equipped with a stirring structure (not shown in the figure).

[0043] The primary zone is an aerobic nitrification zone, where oxygen is supplied through a microbubble aeration system, maintaining dissolved oxygen (DO) at 2-4 mg / L. Nitrifying bacteria on the suspended biological packing will reduce ammonia nitrogen (…). ) is oxidized to nitrate ( Furthermore, some organic matter is aerobically degraded during this stage.

[0044] The secondary zone is an anoxic denitrification zone. Water flows into the secondary zone through the top of the upflow plate, where dissolved oxygen is consumed to <0.5 mg / L. Sulfur-oxidizing bacteria on the sulfur / pyrite composite particles utilize elemental sulfur as an electron donor to... Restore to The slow-release carbon source packing (plant straw / PLA) slowly releases organic carbon, which is then utilized by heterotrophic denitrifying bacteria. At this time, sulfur and iron synergistically produce... / It begins to precipitate with phosphate.

[0045] The third-level zone is a deep processing zone where zero-valent iron / siderite slowly releases iron ions, which react with residual phosphate to form... Precipitation, natural zeolite adsorbs residual substances. Oyster shell powder slowly releases alkalinity, neutralizing the sulfur produced by autotrophic oxidation. Then it can be discharged through the outlet.

[0046] The bottom of the upper baffle plate of the baffle assembly 20 is sealed to the bottom of the horizontal box 10. The baffle assembly 20 is uniformly deflected in the direction of water flow, with a rotation angle of 0-30°. When the concentration of pollutants in the influent is high (such as during peak feeding periods in aquaculture), the operator can adjust the baffle assembly 20 to a larger inclination angle (such as 20°~30°). At this time, the effective cross-sectional area of ​​the bottom (for the lower baffle plate) or top (for the upper baffle plate) of the baffle assembly 20 is reduced, and the flow velocity increases sharply when the water flows through the narrow gap, forming strong local turbulence and eddies in the packing area. This enhances the mass transfer contact between the sewage and the biofilm on the packing surface, and improves the biological denitrification reaction rate. At the same time, the scouring effect of the water flow on the packing surface is enhanced at a large inclination angle, which is conducive to the shedding of aging biofilm and preventing packing caking.

[0047] When the influent flow rate is large or the resistance of the packing layer increases, causing the liquid level at the front end of the device to rise, the operator can adjust the baffle assembly 20 to a smaller tilt angle (such as 0°~10°). At this time, the effective water flow cross-sectional area increases, the water flow resistance decreases, and the head loss decreases, ensuring the smooth operation of gravity flow and preventing the overflow accident at the front end of the device.

[0048] The baffle assembly 20 also has locking rod rotating cavities 201 on both side walls. A main locking rod 23 is positioned between the locking rod rotating cavities 201 of two adjacent baffle assemblies 20 for installing the stuffing box 30. The two sides of the main locking rod 23 are rotatably connected to the inner wall of the locking rod rotating cavity 201 via a rotating shaft through a semi-circular arc surface. The radius of the arc surface of the locking rod rotating cavity 201 is larger than the radius of the arc surface on both sides of the main locking rod 23. A locking groove 231 is formed on the inner end face of the main locking rod 23, forming a snap-fit ​​structure at both ends. The bottom of the snap-fit ​​structure extends inward, and the top extends obliquely upward inward for snapping the stuffing box 30. This allows the stuffing box 30 to be quickly snapped in and fixed without the need for other connecting parts, making installation, disassembly, and replacement very convenient. When the stuffing box 30 becomes clogged or ages and needs replacement, it can simply be pulled out of the snap-fit ​​structure. The replacement process will not damage the overall structure of the baffle assembly 20, effectively reducing maintenance costs and operation time. Meanwhile, the main snap-fit ​​rod is rotatably connected to the inner wall of the rotating cavity via semi-circular arc surfaces on both sides, and the radius of the rotating cavity arc surface is larger than the radius of the main snap-fit ​​rod arc surface. This provides rotational margin for the deflection of the baffle assembly, preventing the stuffing box from jamming during angle adjustment and ensuring smooth angle adjustment.

[0049] A deflection rod 21 is installed on the top of the baffle assembly 20. The connection between the two is provided with a rotational allowance for the deflection of the baffle assembly 20. The deflection rod 21 extends to the outside on one side of the outlet 13, and a limit bolt 22 is movably installed on its external part. The horizontal housing 10 has at least two limit screw holes 102 on one end face of the outlet 13. The limit screw holes 102 match the limit bolts 22, and the two are threadedly connected to fix the tilt angle of the baffle assembly 20 after deflection. When it is necessary to adjust the orientation of the baffle assembly 20, simply loosen the limit bolts 22, rotate the baffle assembly 20 to the target angle, and then tighten the limit bolts 22 to complete the fixation. The adjustment operation is simple and flexible.

[0050] Because the bottom hinge of the baffle assembly is fixed, when the deflection rod drives the top of the baffle assembly to move, the main clamping rod and the baffle assembly form a parallelogram mechanism, ensuring that the stuffing box remains parallel to the bottom of the horizontal box during deflection, thus preventing the stuffing box from tilting and causing packing overflow or water flow short circuit.

[0051] Each main functional area of ​​the horizontal box 10 is provided with a sludge collection trough 101 at the bottom. The side of the horizontal box 10 is also provided with a drain valve 14 corresponding to and connected to the sludge collection trough 101 for draining sewage. Impurities and sewage accumulated during daily use can fall directly into the drain valve 14 through the sludge collection trough 101 and be discharged from the drain valve 14 in a unified manner, so as to avoid the accumulation and residue of impurities in the functional area.

[0052] Working Principle: During operation, the effluent from seawater aquaculture enters the primary zone (aerobic nitrification zone) of the horizontal tank 10 through the water inlet 12. An aeration pipe 15 is installed at the bottom of the primary zone, supplying air or pure oxygen via an external air source to maintain the dissolved oxygen level at 2-4 mg / L. The primary zone employs a downflow plate structure, with water flowing upwards from the bottom, passing through the primary zone packing box 30 filled with nitrifying bacteria packing. Under aerobic conditions, the nitrifying bacteria reduce the ammonia nitrogen (…) in the effluent… ) is oxidized to nitrate ( Meanwhile, some organic matter is aerobically degraded during this stage.

[0053] Water flows from the top of the primary zone, over the upflow plate, and enters the secondary zone (anoxic denitrification zone). The secondary zone uses an upflow plate structure; water enters from the top and flows downwards, passing through the secondary zone packing box 30, which is filled with sulfur autotrophic denitrification packing or slow-release carbon source packing. A stirring structure (not shown in the diagram) is installed at the bottom of the secondary zone to maintain the uniformity of the packing layer and prevent sedimentation. Under anoxic conditions (dissolved oxygen <0.5 mg / L), sulfur autotrophic denitrifying bacteria use elemental sulfur as an electron donor to reduce nitrate to nitrogen gas. This process achieves denitrification; simultaneously, the H⁺ produced during sulfur oxidation can neutralize with the alkaline packing material in the subsequent tertiary zone.

[0054] Water flows from the bottom of the secondary zone through the downflow plate into the tertiary zone (deep treatment zone). After entering from the bottom, the water flows upward, passing through the tertiary zone packing box 30, which is filled with iron-based phosphorus removal packing or zeolite / oyster shell composite packing. The iron-based packing slowly releases iron ions (…). / ), reacting with residual phosphates in the effluent to form ferric phosphate ( ). Precipitation achieves chemical phosphorus removal; zeolite adsorbs residual ammonia nitrogen; oyster shell powder slowly releases alkalinity to neutralize the sulfur produced during the preceding autotrophic denitrification process. Adjust the pH of the effluent.

[0055] The treated effluent is discharged from the device through outlet 13. Since the height of outlet 13 is lower than that of distribution port 12, the entire flow process is driven by the potential energy generated by the elevation difference between the inlet and outlet, and no additional propulsion pump is required inside the device.

[0056] Furthermore, the sludge that settles at the bottom of each functional area is collected in the sludge collection tank 101, and the sludge is discharged from the device by periodically opening the drain valve 14.

[0057] When it is necessary to adjust the tilt angle of the baffle assembly 20, the limiting bolt 22 can be rotated and removed, and then the deflection rod 21 can be pulled to make the entire baffle assembly 20 tilt to one side of the outlet 13 at the same time. During the overall tilting process of the baffle assembly 20, since the bottom rotation position of the baffle assembly 20 remains unchanged, due to the special structure of the parallelogram, the stuffing box 30 will always be parallel to the bottom of the horizontal box 10 (i.e., the bottom rotation position of the baffle assembly 20). At the same time, any line parallel to the bottom within the parallelogram will always remain parallel to the bottom and equal to the bottom. Therefore, under the premise that the bottom length and position do not change, during the deflection process of the baffle assembly 20, the stuffing box 30 only changes in position. It always remains parallel to the bottom of the horizontal box 10 and will not be jammed, but the distance between the two stuffing boxes 30 will approach each other. The rotational allowance between the main clamping rod 23 and the clamping rod rotating cavity 201 is used to adapt to the position change. After adjustment, the limiting bolt 22 is inserted into the corresponding limiting screw hole 102 to lock it in place. This changes the cross-sectional area of ​​the S-shaped baffle channel, thus adapting to different inlet hydraulic loads and adjusting the water flow residence time to ensure the denitrification and phosphorus removal treatment effect. When it is necessary to replace the denitrification and phosphorus removal packing, the packing box 30 can be directly pulled out from the snap-fit ​​structure of the two main clamping rods 23. After the packing is replaced, it can be snapped back in. The operation is convenient.

[0058] After adjusting the baffle assembly 20 to the appropriate position, the limiting bolt 22 can be screwed into the corresponding limiting screw hole 102. The limiting bolt 22 restricts the movement of the deflection rod 21, thereby locking the position of the baffle assembly 20. The locking principle is as follows: Since the deflection rod 21 drives the baffle assembly 20 to tilt as a whole, the movement trajectory of the deflection rod 21 is diagonally downward. At this time, the limiting bolt 22 limits the deflection rod 21 on the horizontal plane, preventing it from moving further downward or upward, and thus preventing it from moving diagonally upward or downward, thereby achieving the locking effect.

[0059] In summary, this integrated nitrogen and phosphorus removal device for marine aquaculture tailwater uses a baffle assembly 20 with deflectable angles to divide the water into multi-stage functional zones with S-shaped baffles. The rotating connection of the baffle assembly 20, together with the deflection rod 21 and the limiting bolt 22, allows for arbitrary adjustment of the tilt angle within the range of 0° to 30°. When the concentration of pollutants in the influent is high, increasing the tilt angle can increase local turbulence and eddies, thereby enhancing mass transfer efficiency; when the influent flow rate is large or the resistance of the packing increases, decreasing the tilt angle can reduce head loss and ensure smooth gravity flow. Therefore, by adjusting the tilt angle of the baffle assembly 20, it can flexibly adapt to changes in different influent water quality and hydraulic load, ensuring stable nitrogen and phosphorus removal treatment effects; the quick-release packing box 30 allows for rapid installation, disassembly, and replacement of the packing, reducing the maintenance difficulty and operating cost of the device; at the same time, it operates entirely by gravity, eliminating the need for additional power propulsion equipment, resulting in lower energy consumption; the alternating arrangement of the upper and lower flow plates forms an S-shaped baffle channel, effectively extending the water flow path and hydraulic residence time without increasing the device's footprint, thus improving the treatment efficiency of each functional area.

[0060] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An integrated nitrogen and phosphorus removal device for seawater aquaculture tailwater, comprising a horizontal box body (10) with a square frame and a top cover (11), wherein the horizontal box body (10) has a water distribution port (12) and a water outlet (13) on both end faces, and the height of the water outlet (13) is lower than that of the water distribution port (12), characterized in that: At least two movable baffle assemblies (20) are provided at intervals inside the horizontal box (10), and a stuffing box (30) is detachably snapped between the baffle assemblies (20). The baffle assembly (20) divides the interior of the horizontal box (10) into multiple functional areas. The baffle assembly (20) includes an upper baffle and a lower baffle. Water passes through the top of the upper baffle, and there is a gap between the top and the top of the box. Water passes through the bottom of the lower baffle, and there is a gap between the bottom and the bottom of the box. The bottom of each baffle assembly (20) is rotatably connected to the inner wall of the horizontal box (10) via a hinge shaft. The top of the baffle assembly (20) is also hinged with a deflection rod (21). The deflection rod (21) extends to the outside of the horizontal box (10) and is equipped with a locking element for adjusting and locking the tilt angle of the baffle assembly (20) relative to the water flow direction to adapt to different water qualities and hydraulic loads.

2. The integrated nitrogen and phosphorus removal device for marine aquaculture tailwater as described in claim 1, characterized in that: The multiple functional areas of the baffle plate group (20) are arranged sequentially from the water distribution port (12) to the water outlet (13) as a primary area, a secondary area and a tertiary area, and each area is equipped with at least two layers of packing boxes (30). The water inlet pattern of the first-level zone is bottom inlet and top outlet, the second-level zone is top inlet and bottom outlet, and the third-level zone is bottom inlet and top outlet, forming an S-shaped flow channel.

3. The integrated nitrogen and phosphorus removal device for marine aquaculture tailwater as described in claim 1, characterized in that: The bottom of the upper baffle of the baffle assembly (20) is sealed to the bottom of the horizontal box (10), and the baffle assembly (20) is uniformly deflected in the direction of water flow, with a rotation angle of 0-30°.

4. The integrated nitrogen and phosphorus removal device for marine aquaculture tailwater as described in claim 1, characterized in that: The baffle assembly (20) is also provided with a snap-fit ​​rod rotating cavity (201) on both sides. A main snap-fit ​​rod (23) is provided between the snap-fit ​​rod rotating cavities (201) of two adjacent baffle assemblies (20) for installing the packing box (30).

5. The integrated nitrogen and phosphorus removal device for marine aquaculture tailwater as described in claim 4, characterized in that: The two sides of the main clamping rod (23) are respectively connected to the inner wall of the clamping rod rotating cavity (201) through a rotating shaft via a semi-circular arc surface. The arc radius of the clamping rod rotating cavity (201) is greater than the semi-circular arc radius of the main clamping rod (23).

6. The integrated nitrogen and phosphorus removal device for marine aquaculture tailwater as described in claim 4, characterized in that: The inner end face of the main snap-fit ​​rod (23) is provided with a snap-fit ​​groove (231), and a snap-fit ​​structure is formed at both ends of the main snap-fit ​​rod (23). The bottom of the snap-fit ​​structure extends inward and the top extends obliquely upward inward, which is used to snap-fit ​​the filling box (30).

7. The integrated nitrogen and phosphorus removal device for marine aquaculture tailwater as described in claim 1, characterized in that: The locking component includes a limiting bolt (22), and the deflection rod (21) is installed on the top of the baffle assembly (20). The connection between the two is provided with a rotational margin for the deflection of the baffle assembly (20). The deflection rod (21) extends to the outside on one side of the outlet (13), and the outer end of the deflection rod (21) is provided with the limiting bolt (22).

8. The integrated nitrogen and phosphorus removal device for marine aquaculture tailwater as described in claim 7, characterized in that: The horizontal box (10) has at least two limiting screw holes (102) on one side end face of the outlet (13). The limiting bolt (22) cooperates with the limiting screw hole (102) to lock the tilt angle of the baffle assembly (20).

9. The integrated nitrogen and phosphorus removal device for marine aquaculture tailwater as described in claim 1, characterized in that: The interior of the packing box (30) is hollow, and through holes are provided at its top and bottom. The hollow interior of the packing box (30) is filled with denitrification and phosphorus removal packing. The stuffing box (30) is fixed with auxiliary snap-fit ​​rods (31) on both sides for snap-fit ​​connection between the baffle assembly (20).

10. The integrated nitrogen and phosphorus removal device for marine aquaculture tailwater as described in claim 1, characterized in that: Each main functional area of ​​the horizontal box (10) is provided with a mud collection trough (101) at the bottom. The side of the horizontal box (10) is also provided with a drain valve (14) corresponding to and connected to the mud collection trough (101) for draining sewage.

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