Aquaculture effluent purification device

Abstract

The application discloses an aquaculture tail water biological membrane purification device, and belongs to the field of environmental engineering water treatment. The device realizes tail water purification through a multilayer purification zone series connection structure, comprises a main body shell, a top water inlet and a bottom water outlet, at least two purification zones are arranged in the main body shell, the at least two purification zones are separated by a flow interception plate and are connected through a spiral descending water tank; the purification zone is filled with gravel (physical filtration and gradient denitrification), biological suspended filler (aerobic biological membrane oxidation) and coupled autotrophic filler (sulfur-iron synergistic denitrification and phosphorus removal) in layers. The spiral water tank prolongs the water residence time, and an aerator strengthens oxygen transfer; modular drawer plates and rotating plate supports facilitate maintenance, and combined with microbial flora and water quality sensor cloud monitoring, efficient synergistic removal of pollutants and system self-adaptive regulation and control are realized.

Description

Technical Field

[0001] This patent belongs to the field of environmental engineering and water treatment, specifically relating to a device for purifying aquaculture wastewater. Background Technology

[0002] With the large-scale and intensive development of aquaculture, the wastewater from aquaculture is rich in uneaten feed, feces, pathogenic microorganisms, nitrogen and phosphorus nutrients (ammonia nitrogen, nitrate, phosphate), and organic pollutants. Direct discharge of this wastewater can easily lead to eutrophication, algal blooms, decreased dissolved oxygen (DO), and ecosystem imbalance in receiving water bodies. Traditional treatment technologies such as sedimentation and filtration can remove some suspended solids (SS), but their removal rate for dissolved pollutants is low (usually below 30%), making it difficult to meet increasingly stringent discharge standards (such as total nitrogen <15 mg / L and total phosphorus <1 mg / L).

[0003] Existing wastewater purification systems generally suffer from the following bottlenecks: a single treatment unit (such as a biological filter) cannot simultaneously and efficiently remove nitrogen (nitrification-denitrification), remove phosphorus (chemical / biological precipitation), and degrade organic matter; biofilm carriers (such as traditional elastic packing) have limited specific surface area, are prone to clogging, and lack the ability to optimize microenvironment regulation (such as ambiguous aerobic / anoxic zones), resulting in low microbial activity and unstable pollutant removal efficiency; short water retention time and a single water flow path (such as direct-fall type) limit the contact between gas, liquid, and solid phases and complex reaction processes (such as anaerobic ammonia oxidation); the packing layer is difficult to maintain (requiring shutdown for cleaning), has high overall energy consumption (aeration ratio >60%), and lacks real-time monitoring and intelligent control methods.

[0004] To overcome the above-mentioned shortcomings, there is an urgent need to develop a low-energy wastewater treatment device that integrates multi-stage synergistic purification, high-efficiency composite packing, enhanced mass transfer pathways, modular easy maintenance, and intelligent monitoring, so as to achieve efficient and stable removal of suspended solids, organic pollutants, and nitrogen and phosphorus nutrients throughout the entire process. Summary of the Invention

[0005] This invention aims to provide a self-purification device for aquaculture wastewater that can efficiently and cost-effectively remove suspended solids, organic pollutants, and nitrogen and phosphorus nutrients. Through the synergistic effect of multi-layer series biofilm purification zones, spiral water flow extension, and composite packing, it achieves synergistic removal of pollutants and low-energy operation of the system.

[0006] A purification device for aquaculture wastewater includes a main shell with an inlet at the top and an outlet on the bottom side. The main shell has at least two purification zones inside, separated by a baffle plate. A spiral descending water trough is provided between the baffle plate and the inner wall of the main shell to connect the upper and lower purification zones.

[0007] This device employs a multi-layered, series-connected purification structure. Aquaculture wastewater enters through the inlet and exits through the outlet. Gravity allows it to pass through four purification zones, achieving thorough purification. A spiral flow extends the water's residence time between each purification zone, while composite packing materials and microorganisms work together to remove contaminants. The wastewater flows from the uppermost to the lowermost purification zone under gravity, undergoing purification through four layers. The spiral-descending water tank forces the water to rotate slowly, increasing the contact time between water, air, and the biofilm.

[0008] A wastewater purification device for aquaculture includes a spiral descending trough with a spiral-shaped downward slope. It is equipped with at least two sets of aerators, arranged sequentially at equal or unequal intervals of 1.5 m to 2 m along the descending direction of the aerator slope. The spiral descending trough is primarily designed to extend the water's residence time and enhance contact efficiency. The water flows in a rotating motion along the spiral slope from top to bottom, significantly extending the path compared to a straight-falling trough.

[0009] A wastewater purification device for aquaculture includes a set of aerators located at the bottom or side wall of a ramp, with the aeration surface parallel to the ramp surface, ensuring full contact between the water flow and air bubbles during the spiral descent. The spiral descent trough, through its unique spiral ramp design, significantly extends the water residence time and utilizes the centrifugal force generated by the rotating water flow to enhance the retention of suspended solids. Simultaneously, the directional aerators on the ramp cause the air bubbles to move in the same direction as the water flow, greatly improving oxygen mass transfer efficiency (dissolved oxygen utilization rate up to 85%) and creating an environmental transformation of dissolved oxygen concentration in adjacent upper and lower purification zones. This simultaneously drives physical sedimentation, oxidation of organic pollutants, and controls the degree of nitrification-denitrification and anaerobic ammonia oxidation reactions in each purification zone. The spiral descent trough also provides pretreated homogeneous water flow for the biofilm system in the purification zone and reduces the overall system energy consumption by more than 30%.

[0010] A wastewater purification device for aquaculture includes a purification zone consisting of a drawer plate, a rotating plate, and a frame plate, which forms a closed space. The drawer plate is slidably connected to a flow interceptor plate and can move horizontally along the short side centerline a of the flow interceptor plate. A handrail is provided on the side of the drawer plate.

[0011] A wastewater purification device for aquaculture includes a rotating plate mainly composed of an isolation plate and a limiting plate. The top side of the isolation plate is connected to the frame plate via a rotating shaft. Water enters from the inlet, exerting a certain impact on the rotating plate. However, the limiting plate effectively restricts the rotating plate from rotating towards the limiting block, preventing excessive water impact from causing the rotating plate to rotate and overflow. In the working state, the isolation plate, together with the frame plate, drawer plate, and intercepting plate, forms a sealed purification zone.

[0012] A wastewater purification device for aquaculture includes a limiting block on the side of the intercepting plate to fix the relative position of the drawer panel and the intercepting plate. The entire purification area is modularly designed. When cleaning the device, the limiting block is released, the drawer panel can be pulled out directly, and the rotating plate rotates inward towards the purification area, allowing workers to clean the inner walls of the drawer panel and frame panel with tools. When the drawer panel is in operation, its bottom surface is completely in contact with the intercepting plate, and the limiting block restricts the drawer panel to prevent it from sliding due to water flow impact and causing internal water to overflow.

[0013] A wastewater purification device for aquaculture includes a purification zone filled with gravel, biologically suspended packing material, coupled autotrophic packing material, and microorganisms forming a biofilm. The microorganisms include nitrifying bacteria, anaerobic ammonia-oxidizing bacteria, and denitrifying bacteria. The nitrifying bacteria (AOB) purify ammonia nitrogen (NH4+). + ) is oxidized to nitrite nitrogen (NO2) - Anaerobic ammonia-oxidizing bacteria convert NO2 under anaerobic conditions. - With NH4 + The nitrogen is directly converted into nitrogen (N2). Denitrifying bacteria utilize the sulfur source (pyrrhotite + sulfur) in the coupled autotrophic packing material for autotrophic denitrification, without the need for an external carbon source. Gravel serves as the most basic packing layer. The gaps between the gravel effectively trap and filter larger suspended solids, uneaten feed, and fecal debris in the water, preventing subsequent packing material blockage and ensuring unobstructed water flow. The gravel surface (especially rough pebbles) provides a large specific surface area for numerous bacteria, protozoa, and metazoans (such as rotifers and oligochaetes), serving as the "foundation" for biofilm formation and growth. Microorganisms attached to the gravel can degrade and transform organic matter. Inside the gravel layer, due to the limited oxygen penetration depth, a gradient microenvironment is formed, from aerobic (surface), facultative anaerobic (middle layer), to anaerobic (deep / core). This allows the gravel layer to perform both aerobic degradation and, in specific areas, denitrification (nitrate removal) and even limited anaerobic ammonia oxidation, resulting in a strong denitrification capacity for aquaculture wastewater.

[0014] The K3 type biological suspension packing material, commercially available from a certain factory, uses gravel to support the lighter biological suspension packing material and coupled autotrophic packing material above, stabilizing the overall packing structure and preventing packing material from accumulating or shifting. Biological suspension packing materials are typically made of porous polymers (such as polyethylene and polypropylene) with a complex internal mesh or honeycomb structure. This provides a huge specific surface area, tens or even hundreds of times larger than ordinary gravel, greatly increasing the amount of microorganisms that can attach per unit volume. The K3 type biological suspension packing material has a density close to or slightly less than water, and is in a suspended fluidized state under the action of water flow (especially combined with aeration). This state allows the packing material to move continuously, rubbing against each other, making it less prone to clogging. All surfaces (including the interior) have the opportunity to contact water flow, nutrients, and dissolved oxygen (DO), resulting in more uniform biofilm growth. The fluidized state greatly improves the contact and mass exchange efficiency between water, air (oxygen), pollutants, and the biofilm surface.

[0015] K3 type biological suspension packing is particularly suitable as the main carrier of aerobic biofilms. The large number of aerobic microorganisms (such as nitrifying bacteria) attached to the biological suspension packing can oxidize and decompose soluble organic pollutants in aquaculture effluent with extremely high efficiency and reduce ammonia nitrogen (NH3-N / NH4). + ) nitrates into nitrite (NO2) - ) and nitrates (NO3) - The coupled autotrophic packing material can be composed of pyrrhotite, sulfur, and limestone (volume ratio 2:1:1). Microorganisms catalyze the release of electrons from pyrrhotite, reducing nitrates to nitrogen gas: 5FeS + 2NO3 - + 6H + → 5Fe 2+ + N2↑ + 5S 0 + 3H2O, the dissolved Fe 2+ Oxidized to Fe 3+ Subsequently, it combines with phosphate to precipitate: Fe 3+ + PO4 3- → FePO4↓ (blue iron ore), sulfur (S) 0 As a denitrification supplement and electronic storage device, it can replenish the elemental sulfur (S) produced in the pyrrhotite reaction. 0 ), further supporting sulfur autotrophic denitrification: 5S 0 + 6NO3 - + 2H₂O → 3N₂↑ +5SO₄ 2- + 4H + S produced by the reaction of pyrrhotite 0 It is reused, reducing sulfur waste and maintaining continuous denitrification capacity (especially under high nitrate loads). Both sulfur / iron reactions produce acid (H₂O). + Limestone (CaCO3) dissolves and buffers pH: CaCO3 + 2H+ +→ Ca 2+ + CO2↑ + H2O, limestone stabilizes the pH at 6.8-7.5 (avoiding pH < 5 which inhibits denitrifying bacteria), and the dissolved HCO3... - The carbon source is supplemented for autotrophic bacteria (such as nitrifying bacteria), and the overall purification zone purifies the aquaculture wastewater.

[0016] A wastewater purification device for aquaculture includes a drain valve in each purification zone for discharging water from that zone for cleaning. The drain valves can independently empty the wastewater from each purification zone, supporting zoned cleaning and restart. Single-zone drainage does not affect overall operation, and regular emptying prevents sediment accumulation.

[0017] A device for purifying aquaculture wastewater, wherein each purification zone is equipped with a water quality sensor.

[0018] A wastewater purification device for aquaculture includes a multi-parameter integrated probe for real-time monitoring of pH, DO, and NH4. + NO3 - The system monitors turbidity and connects to a cloud platform via a wireless transmission module to generate a purification efficiency assessment report. Multi-parameter integrated probes cover core pollution indicators in each purification zone, capturing real-time dynamic changes in water quality across different areas. By comparing data differences between different levels (e.g., high DO at the top and low DO at the bottom), it can accurately pinpoint fault points such as blockage, packing failure, or abnormal microbial activity, achieving refined diagnosis from "overall purification effect" to "layered module efficiency." Based on real-time DO and nitrogen speciation data, it intelligently adjusts the aerator's start and stop to avoid over-aeration (e.g., low DO is required in the bottom denitrification zone); simultaneously, it considers NH4... + / NO3 - By dynamically adjusting water retention time or microbial dosage based on concentration changes, the system ensures efficient pollutant removal while reducing energy consumption by over 25%. The cloud platform uses machine learning to analyze historical data streams and establishes a purification efficiency prediction model. A sudden drop in pH indicates excessive acid production from the sulfur / iron reaction (requiring limestone buffering intervention), and NO3... - The system cumulatively indicates insufficient denitrification (coupled with the need for filler replenishment) and tracks the biofilm activity decay cycle of the filler (e.g., changes in the specific surface area utilization rate of K3 type biological suspension filler), guiding predictive maintenance and avoiding sudden failures. Wireless transmission replaces manual sampling and testing, significantly improving operation and maintenance efficiency. The automatically generated purification efficiency assessment report (including pollutant removal rate, unit energy consumption ratio, and filler life assessment) meets environmental compliance audit requirements and provides data support for carbon footprint accounting, promoting the standardization and green certification of aquaculture wastewater treatment. The cloud platform can access data pools from multiple devices, and by comparing the operating parameters of each purification zone under different aquaculture species and climatic conditions, it can extract the optimal control logic (e.g., temperature-microbial activity correction coefficient), providing an adaptive algorithm basis for the large-scale promotion of the system.

[0019] The advantages of this invention are as follows: This invention significantly improves the synergistic removal efficiency of suspended solids, organic matter, and nitrogen and phosphorus pollutants without the need for an external carbon source, through multi-layer composite packing synergistic purification (gravel-based filtration and gradient denitrification, efficient aerobic oxidation with biological suspension packing, and simultaneous denitrification and phosphorus removal with coupled autotrophic packing), enhanced air-water contact with a spiral downcomer, convenient maintenance through a modular drawer structure, and intelligent monitoring and dynamic optimization of operation through a cloud platform. At the same time, it reduces system energy consumption and enhances the convenience of operation and maintenance. Attached Figure Description

[0020] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the overall device of the present invention;

[0022] Figure 2 This is a cross-sectional view of the overall device of the present invention;

[0023] Figure 3 This is a schematic diagram of the spiral descending water tank of the present invention;

[0024] Figure 4 This is a schematic diagram of the inner structure of the frame plate, the flow-blocking plate, the drawer plate, and the rotating plate of the present invention;

[0025] Figure 5 This is a schematic diagram of the outer structure of the frame plate, the flow-blocking plate, the drawer plate, and the rotating plate of the present invention;

[0026] Figure 6 This is a schematic diagram of the drawer panel of the present invention.

[0027] Figure 7 This is a schematic diagram of the purification zone structure after the drawer panel of the present invention is pulled out;

[0028] Figure 8 This is a schematic diagram of the rotating plate structure of the present invention.

[0029] Attached diagram descriptions: 1a-Water inlet, 1b-Water outlet, 1-Main body shell, 11-Purification zone, 12-Break plate, 2-Spiral descending water tank, 13-Rotating plate, 13a-Isolation plate, 13b-Limiting plate, 14-Drawer plate, 14a-Handrail, 15-Frame plate, 16-Limiting block, 3-Drain valve. 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] The concepts involved in this application will first be described with reference to the accompanying drawings. It should be noted that the following descriptions of various concepts are only for the purpose of making the content of this application easier to understand and do not constitute a limitation on the scope of protection of this application; furthermore, the embodiments and features in the embodiments of this application can be combined with each other unless otherwise specified. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0032] Example 1:

[0033] See attached document Figure 1-3 As shown, the wastewater purification device adopts a rectangular main shell 1, with four interconnected purification zones 11 inside, separated by a baffle plate 12. Aquaculture wastewater enters from the top inlet 1a and flows through a spiral descending water tank 2 layer by layer. The spiral descending water tank 2 contains three sets of aerators, which achieve co-current air-water movement through microporous aeration, significantly extending the water residence time to 25 minutes and forming a dissolved oxygen gradient. This simultaneously drives physical sedimentation and biological oxidation-reduction reactions. The aeration rate of the aerators can be adjusted according to water quality monitoring data from a water quality sensor. The purification zone 11 is filled with a gradient combination of packing materials: the bottom layer of gravel (15-30 mm diameter) traps large suspended particles and creates a facultative anaerobic microenvironment; the middle layer of K3 biological suspension packing material supports efficient nitrification by aerobic microorganisms with its ultra-high specific surface area; and the bottom layer of coupled packing material (pyrrhotite: sulfur: limestone = 2:1:1) achieves nitrogen and phosphorus removal through a sulfur / iron autotrophic reaction, while limestone neutralizes acidity and maintains pH stability.

[0034] See attached document Figure 1 Appendix Figure 5 Appendix Figure 6 As shown, the device is equipped with an intelligent monitoring system, and each purification zone 11 is equipped with multi-parameter sensors (real-time collection of pH, DO concentration, NH4). + Concentration, NO3 - (Concentration and turbidity), the data is transmitted wirelessly to the cloud platform. The system automatically adjusts its operation based on dynamic water quality: for example, reducing aeration to save energy when the DO in the bottom layer exceeds 0.5 mg / L, and increasing aeration in the fourth layer (NO3). -When the cumulative concentration exceeds 5 mg / L, a packing replenishment warning is triggered, and an assessment report is automatically generated, including indicators such as ammonia nitrogen removal rate (95%) and energy consumption per ton of water (0.8 kWh). The modular structure design supports zoned maintenance—after the limit block 16 is unlocked, the drawer plate 14 can be pulled out horizontally for high-pressure flushing. Combined with the single-zone drain valve 3, cleaning can be completed within 20 minutes without stopping the machine, significantly reducing annual operation and maintenance costs.

[0035] The system achieves deep removal of pollutants through a multi-level synergistic mechanism: the centrifugal force of the spiral descending tank 2 initially intercepts suspended solids; the K3 type biological suspension packing material, in a laminar state, enhances the biofilm contact efficiency, enabling aerobic microorganisms to efficiently degrade organic matter and convert ammonia nitrogen into nitrate; the coupled packing layer drives pyrrhotite-catalyzed denitrification (NO3) under anaerobic conditions. - →N2↑) and sulfur autotrophically remove nitrogen, and soluble ferrous iron is oxidized and then combined with phosphate precipitation to remove phosphorus.

[0036] Example 2:

[0037] See attached document Figure 4-8 As shown, regarding the disassembly and cleaning method of purification zone 11, the gravel, K3 type biological suspended packing, and coupled self-trophic packing in purification zone 11 are prone to shifting to one side under the long-term scouring of water flow. Therefore, after a period of effluent treatment, the staff needs to clean and rearrange the gravel, K3 type biological suspended packing, and coupled self-trophic packing in purification zone 11.

[0038] Preferably, the operator first loosens the limiting block 16, then uses the drive device to lock the handle 14a and pulls the drawer panel 14 out of the main body shell 11, allowing for independent cleaning of the extracted drawer panel 14. The rotating plate 13 is connected to the frame plate 15 via a pivot. During cleaning, the rotating plate 13 is rotated inwards towards the main body shell 1 to facilitate internal cleaning. After cleaning, the filler is rearranged and placed on the drawer panel 14, and the drawer panel 14 is reinserted into the main body frame. The rotating plate 13 returns to its original position, and the limiting block 16 rotates to lock the drawer panel 14 in place.

[0039] Example 3:

[0040] This embodiment details how the spiral descending water tank 2 dynamically determines the aeration rate based on real-time data from water quality sensors to optimize pollutant removal efficiency, reduce energy consumption, and enhance system adaptability. The spiral descending water tank 2 descends in a spiral shape along a ramp (slope designed at 15°), connecting each purification zone 11. Three sets of aerators are evenly spaced at 1.8m intervals along the ramp. Each set of aerators is located at the bottom of the ramp, with the aeration surface parallel to the ramp surface, ensuring that the bubbles move in the same direction as the water flow to enhance oxygen mass transfer efficiency.

[0041] Each layer of water quality sensors generates a dynamic dataset, including DO gradient and NH4 gradient. + / NO3 - Ratios, pH fluctuations, and turbidity changes. The cloud platform calculates the oxidation-reduction potential (ORP) at each monitoring point. For example, when DO > 5 mg / L and pH > 7.5, it is considered a risk of over-aeration; when NO3... - When the cumulative rate is >0.5 mg / L / min, denitrification is considered insufficient. A predictive model (such as a random forest algorithm) is trained based on historical data. Input parameters include water temperature, influent load, and sensor readings. The output is a recommendation for the optimal aeration rate. For example, the model correlates with high NH4 levels. + The prediction error for concentration (>15mg / L) and increased aeration volume is <5%. If the turbidity of a certain section of the tank suddenly increases, the platform will locate the blockage point and adjust the aerator accordingly to avoid local hypoxia.

[0042] There are different methods for adjusting the aeration rate, and the logic can be as follows:

[0043] Alternatively, the DO concentration-driven control method can be used. If an aerobic environment is desired, when DO < 2 mg / L (the threshold for aerobic zone requirements), increase the aeration rate by 20%-30%; if an anaerobic environment is desired, when DO > 0.5 mg / L (the upper limit for anaerobic zone requirements), reduce the aeration rate to the lowest level.

[0044] Optionally, a synergistic regulation method for nitrogen speciation, such as NH4 + Concentration >10 mg / L and NO3 - <2mg / L, increase aeration to create an aerobic environment in the lower purification zone to enhance nitrification; if NO3... - >5mg / L, reduce aeration to create an anaerobic environment in the lower purification zone and initiate sulfur autotrophic denitrification (using coupling packing).

[0045] The embodiments and / or implementation methods described above are merely preferred embodiments and / or implementation methods for implementing the technology of the present invention, and are not intended to limit the implementation methods of the technology of the present invention in any way. Any person skilled in the art can make some modifications or alterations to other equivalent embodiments without departing from the scope of the technical means disclosed in the content of the present invention, but they should still be regarded as the technology or embodiments that are substantially the same as the present invention.

[0046] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. The above descriptions are only preferred embodiments of this application. It should be noted that due to the limitations of written expression, while there are objectively infinite specific structures, those skilled in the art can make several improvements, modifications, or changes without departing from the principles of this application, and can also combine the above technical features in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of this application.

Claims

1. A device for purifying aquaculture wastewater, comprising a main body shell (1), wherein the main body shell (1) has an inlet (1a) at the top and an outlet (1b) on the bottom side, characterized in that: The main shell (1) has at least two purification zones (11) inside, one above the other. Each purification zone (11) is separated by a flow interceptor (12). A spiral descending water tank (2) is provided between the flow interceptor (12) and the inner wall of the main shell (1) to connect the upper and lower purification zones (11). The spiral descending water tank (2) has a spiral descending slope and is equipped with at least two sets of aerators. The aerators are arranged sequentially at equal intervals of 1.5-2 m or unequal intervals of 1.5-2 m in the descending direction of the slope. Each set of aerators is located at the bottom or side wall of the ramp, and the aeration surface is parallel to the ramp surface so that the water flow can fully contact the air bubbles during the spiral descent; the purification zone (11) is filled with packing material and microorganisms are added to form a biofilm.

2. The aquaculture wastewater purification device according to claim 1, characterized in that: The purification zone (11) is a closed space composed of a drawer plate (14), a rotating plate (13), and a frame plate (15). The drawer plate (14) is slidably connected to the intercepting plate (12) and can move horizontally along the short side center line a of the intercepting plate (12). The drawer plate (14) is provided with a handrail (14a) on its side.

3. The aquaculture wastewater purification device according to claim 2, characterized in that: The rotating plate (13) is mainly composed of an isolation plate (13a) and a limiting plate (13b). The top side of the isolation plate (13a) is connected to the frame plate (15) via a rotating shaft.

4. The aquaculture wastewater purification device according to claim 2, characterized in that: The side of the cut-off plate (12) is provided with a limiting block (16) for fixing the relative position of the drawer plate (14) and the cut-off plate (12).

5. The aquaculture wastewater purification device according to claim 1, characterized in that: The purification zone (11) is filled with gravel, biological suspension packing, and coupled autotrophic packing and microorganisms are added to form a biofilm. The microorganisms include nitrifying bacteria, anaerobic ammonia oxidizing bacteria, and denitrifying bacteria. The coupled autotrophic packing is composed of pyrrhotite, sulfur, and limestone.

6. The aquaculture wastewater purification device according to claim 1, characterized in that: Each purification zone (11) is equipped with a drain valve (3) for draining water from the purification zone (11) for cleaning.

7. The aquaculture wastewater purification device according to claim 1, characterized in that: Each purification zone (11) is equipped with a water quality sensor.

8. The aquaculture wastewater purification device according to claim 7, characterized in that: The water quality sensor includes a multi-parameter integrated probe that monitors pH, dissolved oxygen concentration, and NH4 in real time. + Concentration, NO3 - The concentration and turbidity are measured, and a purification efficiency assessment report is generated by connecting to a cloud platform via a wireless transmission module.

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