Water quality purification device of high-density recirculating aquaculture system

Abstract

The invention relates to the technical field of aquaculture, in particular to a water quality purification device of a high-density recirculating aquaculture system.The water quality purification device is characterized in that a particle filtering module firstly filters and purifies aquaculture water, the treated water enters a two-stage nitration module to effectively remove ammonia nitrogen and nitrite, and in the nitration reaction process, the water quality is purified; the dissolved oxygen control module monitors and adjusts the content of dissolved oxygen in the water body in real time, the water body subjected to nitrification treatment is driven by the energy-saving water pump module and circularly flows back to the culture pond, water body cyclic utilization is achieved, meanwhile, energy consumption is reduced, tail water is divided into the tail water treatment module to be subjected to deep purification, and after an adsorbent is saturated, the tail water enters the regeneration service module to be subjected to regeneration treatment. And the whole system is integrated by the integrated connection modules, so that efficient cooperative operation of the modules is ensured, and stable operation of the system is maintained.

Description

Technical Field

[0001] This invention relates to the field of aquaculture technology, and in particular to a water purification device for a high-density recirculating aquaculture system. Background Technology

[0002] High-density recirculating aquaculture systems are widely used in the aquaculture industry due to their efficient use of water resources and aquaculture space. Water purification devices, as the core component of the system, are crucial for maintaining water quality and ensuring the healthy growth of farmed organisms.

[0003] However, existing water purification devices have many shortcomings: on the one hand, their filtration efficiency for small-diameter particulate pollutants is poor, leading to an increase in suspended solids in the water, affecting water transparency and the respiration of aquatic organisms; on the other hand, design flaws in biological filters result in unsatisfactory removal of ammonia nitrogen and nitrite, making it difficult to meet the stringent water quality requirements of aquaculture. Furthermore, the overall energy consumption of the system is high, especially for key components such as water pumps and water lifting equipment, increasing aquaculture costs. The wastewater treatment process is cumbersome and unstable, making it difficult to consistently meet environmental discharge standards and facing environmental regulatory pressure. Simultaneously, the water quality monitoring and control system is incomplete, unable to comprehensively, accurately, and promptly reflect water conditions and make corresponding adjustments, resulting in large fluctuations in water quality, which is detrimental to the stable growth of aquatic organisms. Summary of the Invention

[0004] The purpose of this invention is to provide a water purification device for a high-density recirculating aquaculture system, which aims to solve the problem that existing water purification devices cannot meet the water quality requirements of modern aquaculture.

[0005] To achieve the above objectives, the present invention provides a water purification device for a high-density recirculating aquaculture system, comprising a particle filtration module, a two-stage nitrification module, a dissolved oxygen control module, an energy-saving water pump module, a wastewater treatment module, a regeneration service module, and an integrated connection module; the particle filtration module, the two-stage nitrification module, the dissolved oxygen control module, the energy-saving water pump module, the wastewater treatment module, and the regeneration service module are connected in sequence and respectively connected to the integrated connection module;

[0006] The particle filtration module is used to efficiently remove suspended particulate matter from water and purify the water quality.

[0007] Two-stage nitrification modules are used to effectively remove ammonia nitrogen and nitrite from water, reducing water toxicity;

[0008] The dissolved oxygen control module is used to regulate the dissolved oxygen content in the water.

[0009] The energy-saving water pump module is used to reduce energy consumption in circulating water.

[0010] The wastewater treatment module is used for deep treatment of aquaculture wastewater to remove harmful substances;

[0011] The regeneration service module is used for the regeneration of the adsorbent to restore its adsorption performance.

[0012] The integrated connection module is used to integrate various functional modules to achieve efficient collaborative operation of the system.

[0013] The particle filtration module includes a magnetic filter unit, a water pump power unit, a backwashing unit, and a filtration status monitoring unit.

[0014] The magnetic filter unit is used to remove fine suspended particles from water through magnetic adsorption.

[0015] The water pump power unit is used to provide the power for water flow and drive water through the filter screen;

[0016] The backwashing unit is used to clean the filter screen regularly to prevent clogging;

[0017] The filter status monitoring unit is used to monitor the filter's clogging status in real time and prompt the user to take maintenance measures.

[0018] The two-stage nitrification module includes an aerobic reaction tank unit, an anoxic reaction tank unit, a carbon source addition unit, and a dissolved oxygen adjustment unit.

[0019] The aerobic reaction tank unit is used to promote the growth of nitrifying bacteria and remove ammonia nitrogen;

[0020] The anoxic reaction tank unit is used to promote the growth of denitrifying bacteria and remove nitrite;

[0021] The carbon source addition unit is used to supplement the denitrification reaction with organic carbon source to improve the denitrification efficiency;

[0022] The dissolved oxygen regulation unit is used to precisely control the dissolved oxygen levels in the aerobic and hypoxic zones.

[0023] The dissolved oxygen control module includes a dissolved oxygen sensor unit, an oxygenation and aeration unit, and a control algorithm unit.

[0024] The dissolved oxygen sensor unit is used to monitor the dissolved oxygen concentration in the water in real time;

[0025] The oxygenation and aeration unit is used to regulate the dissolved oxygen content in the water.

[0026] The control algorithm unit is used to intelligently control the operation of the oxygenation and aeration unit based on feedback from the dissolved oxygen sensor.

[0027] The energy-saving water pump module includes a high-efficiency water pump unit, a fluid dynamics optimization unit, and an energy consumption monitoring unit.

[0028] The high-efficiency water pump unit is used to efficiently drive water circulation;

[0029] The fluid dynamics optimization unit is used to reduce energy loss of water in the pipeline;

[0030] The energy consumption monitoring unit is used to monitor the energy consumption of the water pump in real time.

[0031] The wastewater treatment module includes a three-phase separation unit, an adsorption filtration unit, a wastewater discharge unit, and an adsorbent saturation monitoring unit.

[0032] The three-phase separation unit is used to separate solids, liquids and gases in the effluent;

[0033] The adsorption filtration unit is used for deep purification of effluent, removing organic matter and harmful substances;

[0034] The tailwater discharge unit is used to discharge the treated tailwater in compliance with standards.

[0035] The adsorbent saturation monitoring unit is used to monitor the adsorption state of the adsorbent material.

[0036] The regeneration service module includes an adsorbent regeneration unit, a carbon source recovery unit, and a regeneration status monitoring unit.

[0037] The adsorbent regeneration unit is used to restore the adsorption capacity of the adsorbent material;

[0038] The carbon source recovery unit is used to recover and recycle the carbon source in the wastewater treatment system.

[0039] The regeneration status monitoring unit is used to monitor the regeneration status of the adsorbent and carbon source in real time.

[0040] This invention discloses a water purification device for a high-density recirculating aquaculture system. During operation, the particle filtration module first filters the aquaculture water, removing suspended particulate matter and purifying the water. The treated water then enters the two-stage nitrification module, undergoing aerobic and anoxic reactions sequentially to effectively remove ammonia nitrogen and nitrite, reducing water toxicity. During nitrification, the dissolved oxygen control module monitors and adjusts the dissolved oxygen content in real time to ensure reaction efficiency. The nitrified water is then circulated back to the aquaculture pond by an energy-saving water pump module, achieving water recycling and reducing energy consumption. The effluent is diverted to the effluent treatment module for deep purification, removing harmful substances and ensuring compliance with discharge standards. After the adsorbent becomes saturated, it enters the regeneration service module for regeneration, restoring adsorption performance and achieving resource recycling. The entire system is integrated by the integrated connection module, ensuring efficient and coordinated operation of each module and maintaining stable system operation. This solves the problem that existing water purification devices cannot meet the water quality requirements of modern aquaculture. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of the present invention or 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 only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 This is a schematic diagram of a water purification device for a high-density recirculating aquaculture system provided by the present invention.

[0043] Figure 2 This is a schematic diagram of a particle filtration module.

[0044] Figure 3 This is a schematic diagram of a two-stage nitration module.

[0045] Figure 4 This is a schematic diagram of the dissolved oxygen control module.

[0046] Figure 5 This is a schematic diagram of an energy-saving water pump module.

[0047] Figure 6 This is a schematic diagram of the wastewater treatment module.

[0048] Figure 7 This is a schematic diagram of the regeneration service module.

[0049] Figure 8 This is a schematic diagram of an integrated connection module.

[0050] In the diagram: 1-Particle filtration module, 2-Two-stage nitrification module, 3-Dissolved oxygen control module, 4-Energy-saving water pump module, 5-Trench water treatment module, 6-Regeneration service module, 7-Integrated connection module, 11-Magnetic filter unit, 12-Water pump power unit, 13-Backwashing unit, 14-Filtration status monitoring unit, 21-Aerobic reaction tank unit, 22-Anoxic reaction tank unit, 23-Carbon source addition unit, 24-Dissolved oxygen adjustment unit, 31-Dissolved oxygen sensor unit, 32-Aeration unit, 33-Control algorithm unit, 41-High-efficiency water pump unit, 42-Fluorescence optimization unit, 43-Energy consumption monitoring unit, 51-Three-phase separation unit, 52-Adsorption filtration unit, 53-Trench water discharge unit, 54-Adsorbent saturation monitoring unit, 61-Adsorbent regeneration unit, 62-Carbon source recovery unit, 63-Regeneration status monitoring unit, 71-Pipeline connection unit, 72-Intelligent control unit, 73-Module disassembly unit. Detailed Implementation

[0051] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0052] Please see Figures 1 to 8 This invention provides a water purification device for a high-density recirculating aquaculture system, comprising a particle filtration module 1, a two-stage nitrification module 2, a dissolved oxygen control module 3, an energy-saving water pump module 4, a wastewater treatment module 5, a regeneration service module 6, and an integrated connection module 7; the particle filtration module 1, the two-stage nitrification module 2, the dissolved oxygen control module 3, the energy-saving water pump module 4, the wastewater treatment module 5, and the regeneration service module 6 are connected in sequence and are respectively connected to the integrated connection module 7;

[0053] The particle filtration module 1 is used to efficiently remove suspended particulate matter from water and purify the water quality.

[0054] Two-stage nitrification module 2 is used to effectively remove ammonia nitrogen and nitrite from water and reduce water toxicity;

[0055] The dissolved oxygen control module 3 is used to regulate the dissolved oxygen content in the water.

[0056] The energy-saving water pump module 4 is used to reduce energy consumption in circulating water.

[0057] The wastewater treatment module 5 is used for deep treatment of aquaculture wastewater to remove harmful substances;

[0058] The regeneration service module 6 is used for the regeneration of the adsorbent to restore its adsorption performance.

[0059] The integrated connection module 7 is used to integrate various functional modules to achieve efficient collaborative operation of the system.

[0060] In this embodiment, during operation, the particle filtration module 1 first filters the aquaculture water to remove suspended particulate matter and purify the water. The treated water then enters the two-stage nitrification module 2, where aerobic and anoxic reactions occur sequentially, effectively removing ammonia nitrogen and nitrite and reducing water toxicity. During the nitrification process, the dissolved oxygen control module 3 monitors and adjusts the dissolved oxygen content in the water in real time to ensure reaction efficiency. The nitrified water is then driven by the energy-saving water pump module 4 and circulated back to the aquaculture pond, achieving water recycling and reducing energy consumption. The effluent is diverted to the effluent treatment module 5 for deep purification to remove harmful substances and ensure that discharge meets standards. After the adsorbent becomes saturated, it enters the regeneration service module 6 for regeneration to restore adsorption performance and achieve resource recycling. The entire system is integrated by the integrated connection module 7 to ensure efficient and coordinated operation of each module and maintain stable system operation, thereby solving the problem that existing water purification devices cannot meet the water quality requirements of modern aquaculture.

[0061] Furthermore, the particle filtration module 1 includes a magnetic filter unit 11, a water pump power unit 12, a backwashing unit 13, and a filtration status monitoring unit 14.

[0062] The magnetic filter unit 11 is used to remove fine suspended particles in water by magnetic adsorption.

[0063] The water pump power unit 12 is used to provide the power for water flow and drive water through the filter screen;

[0064] The backwashing unit 13 is used to clean the filter screen regularly to prevent clogging;

[0065] The filter status monitoring unit 14 is used to monitor the clogging status of the filter in real time and prompt the user to take maintenance measures.

[0066] In this embodiment, the magnetic filter unit 11 uses a filter screen made of magnetic material. When water containing suspended particles flows through it, the magnetic particles are adsorbed onto the filter screen, achieving preliminary filtration. Regularly replacing or cleaning the filter screen can restore the filtration effect. The water pump power unit 12 provides power to transport the water to be filtered to the magnetic filter unit 11, ensuring that the water passes through the filter screen at an appropriate flow rate, thereby improving filtration efficiency. When the filter screen is clogged, the backwashing unit 13 activates the backwashing system, using high-pressure water or compressed air to backwash the filter screen, flushing off the adsorbed impurities, which are then discharged from the system, restoring the filter screen's filtration performance. The filtration status monitoring unit 14 uses pressure sensors installed at the inlet and outlet of the filter screen to monitor the pressure difference. When the pressure difference exceeds a set threshold, it indicates that the filter screen is clogged, and the system automatically triggers an alarm, prompting the user to perform backwashing or replace the filter screen.

[0067] Furthermore, the two-stage nitrification module 2 includes an aerobic reaction tank unit 21, an anoxic reaction tank unit 22, a carbon source addition unit 23, and a dissolved oxygen adjustment unit 24;

[0068] The aerobic reaction tank unit 21 is used to promote the growth of nitrifying bacteria and remove ammonia nitrogen;

[0069] The anoxic reaction tank unit 22 is used to promote the growth of denitrifying bacteria and remove nitrite;

[0070] The carbon source addition unit 23 is used to supplement the denitrification reaction with organic carbon source to improve nitrogen removal efficiency.

[0071] The dissolved oxygen regulation unit 24 is used to precisely control the dissolved oxygen levels in the aerobic zone and the hypoxic zone.

[0072] In this embodiment, the aerobic reaction tank unit 21 is equipped with an aeration device to provide sufficient oxygen for nitrifying bacteria, promoting their growth and reproduction, and oxidizing ammonia nitrogen into nitrite and nitrate, thereby achieving ammonia nitrogen removal. In the anoxic reaction tank unit 22, under anoxic conditions, denitrifying bacteria utilize organic carbon sources to reduce nitrite and nitrate into nitrogen gas, thus removing nitrogen from the water and reducing toxicity and eutrophication risks. The carbon source addition unit 23, based on the carbon-to-nitrogen ratio in the water, adds an appropriate amount of organic carbon source (such as methanol, sodium acetate, etc.) to the anoxic reaction tank via a metering pump, providing the necessary electron donor for the denitrification reaction and improving nitrogen removal efficiency. The dissolved oxygen regulation unit 24 uses a dissolved oxygen sensor to monitor the dissolved oxygen levels in the aerobic and anoxic zones in real time, and precisely controls the dissolved oxygen concentration in each zone by adjusting the aeration rate or water flow rate of the aeration device, ensuring the smooth progress of nitrification and denitrification reactions.

[0073] Furthermore, the dissolved oxygen control module 3 includes a dissolved oxygen sensor unit 31, an oxygenation aeration unit 32, and a control algorithm unit 33;

[0074] The dissolved oxygen sensor unit 31 is used to monitor the dissolved oxygen concentration in the water in real time;

[0075] The oxygenation aeration unit 32 is used to adjust the dissolved oxygen content in the water.

[0076] The control algorithm unit 33 is used to intelligently control the operation of the oxygenation and aeration unit 32 based on the feedback from the dissolved oxygen sensor.

[0077] In this embodiment, the dissolved oxygen sensor unit 31 monitors the dissolved oxygen concentration in the water in real time and transmits the data to the control system, providing a basis for dissolved oxygen regulation. When the dissolved oxygen concentration is lower than the set value, the oxygenation aeration unit 32 activates the oxygenation aeration equipment (such as microporous aeration discs, jet aerators, etc.) to introduce air or pure oxygen into the water, increasing the dissolved oxygen level and meeting the respiration and metabolic needs of aquatic organisms and microorganisms. Based on the data fed back by the dissolved oxygen sensor, the control algorithm unit 33 uses PID control algorithms to intelligently adjust the operating parameters of the oxygenation aeration equipment (such as aeration volume, aeration time, etc.) to achieve precise control and avoid excessively high or low dissolved oxygen levels.

[0078] Furthermore, the energy-saving water pump module 4 includes a high-efficiency water pump unit 41, a fluid dynamics optimization unit 42, and an energy consumption monitoring unit 43;

[0079] The high-efficiency water pump unit 41 is used to efficiently drive water circulation;

[0080] The fluid dynamics optimization unit 42 is used to reduce energy loss of water in the pipeline;

[0081] The energy consumption monitoring unit 43 is used to monitor the energy consumption of the water pump in real time.

[0082] In this embodiment, the high-efficiency water pump unit 41 uses a high-efficiency and energy-saving water pump, which features high head, large flow rate, and low energy consumption. It can drive water circulation within the system with low energy consumption, improving water flowability and promoting water exchange and oxygen dissolution. The fluid dynamics optimization unit 42 performs fluid dynamics optimization design on the internal structure and flow channel of the water pump, reducing energy loss during water transport, improving pump efficiency, and lowering operating costs. The energy consumption monitoring unit 43 is equipped with power sensors and other monitoring equipment to monitor the pump's energy consumption data in real time. When energy consumption abnormally increases, it promptly issues an alarm to remind the user to check the pump's operating status, ensuring the pump always operates within its high-efficiency range.

[0083] Furthermore, the wastewater treatment module 5 includes a three-phase separation unit 51, an adsorption filtration unit 52, a wastewater discharge unit 53, and an adsorbent saturation monitoring unit 54.

[0084] The three-phase separation unit 51 is used to separate solids, liquids and gases in the effluent;

[0085] The adsorption filtration unit 52 is used for deep purification of effluent, removing organic matter and harmful substances.

[0086] The tailwater discharge unit 53 is used to discharge the treated tailwater in compliance with standards.

[0087] The adsorbent saturation monitoring unit 54 is used to monitor the adsorption state of the adsorbent material.

[0088] In this embodiment, the three-phase separation unit 51 utilizes principles such as gravity sedimentation and flotation to separate suspended solids, grease, and gas in the effluent, initially removing impurities and reducing the load on subsequent treatment. The adsorption filtration unit 52 employs a filter media layer made of activated carbon, zeolite, and other adsorption materials to deeply adsorb and filter the effluent, removing organic matter, heavy metal ions, odors, and other harmful substances, further improving water quality. The effluent discharged by the effluent discharge unit 53 discharges the treated effluent to a designated location through a discharge pipeline, complying with environmental standards and relevant regulations, thus reducing environmental pollution. The adsorbent saturation monitoring unit 54 periodically monitors the adsorption performance and saturation level of the adsorbent. When the adsorbent approaches saturation, it promptly reminds the user to replace the adsorbent or perform regeneration to ensure the stability of the effluent treatment effect.

[0089] Furthermore, the regeneration service module 6 includes an adsorbent regeneration unit 61, a carbon source recovery unit 62, and a regeneration status monitoring unit 63;

[0090] The adsorbent regeneration unit 61 is used to restore the adsorption capacity of the adsorbent material;

[0091] The carbon source recovery unit 62 is used to recover and recycle the carbon source in the wastewater treatment system;

[0092] The regeneration status monitoring unit 63 is used to monitor the regeneration status of the adsorbent and carbon source in real time.

[0093] In this embodiment, the adsorbent regeneration unit 61 uses methods such as thermal regeneration and chemical regeneration to restore the adsorption performance of the saturated adsorbent, achieving adsorbent recycling and reducing operating costs. The carbon source recovery unit 62 recovers unreacted organic carbon sources from the wastewater treatment system using physical or chemical methods. After treatment, these carbon sources can be added back to the anoxic reaction tank, improving carbon source utilization and reducing carbon source waste and operating costs. The regeneration status monitoring unit 63 monitors the regeneration status of the adsorbent and carbon source in real time, including parameters such as regeneration temperature, time, and recovery rate, ensuring the smooth progress of the regeneration process and the reliability of the regeneration effect, thus providing a guarantee for the stable operation of the system.

[0094] Furthermore, the integrated connection module 7 includes a pipe connection unit 71, an intelligent control unit 72, and a module disassembly unit 73;

[0095] The pipe connection unit 71 is used to connect the various functional modules;

[0096] The intelligent control unit 72 is used to optimize pipeline flow distribution;

[0097] The module disassembly unit 73 is used to facilitate the disassembly and replacement of functional modules.

[0098] In this embodiment, the pipe connection unit 71 uses corrosion-resistant, high-strength pipe materials to connect the inlet and outlet of each functional module, forming a complete water circulation system. This ensures smooth water flow between modules and reduces the risk of pipe leakage and blockage. The intelligent control unit 72, based on system operating status and water quality requirements, intelligently controls the water flow velocity and flow rate in the pipes by adjusting valve openings, pump speeds, and other means, optimizing hydraulic distribution and improving system operating efficiency and stability. The module disassembly unit 73 features a convenient module disassembly interface and fixing device, facilitating quick removal of modules from the system when maintenance, replacement, or upgrades are needed, reducing downtime and improving system maintainability and flexibility.

[0099] Beneficial effects:

[0100] I. Improve water purification effect: Through the synergistic effect of modules such as particle filtration and two-stage nitrification, various pollutants in the water are effectively removed, water quality is improved, and a healthy growth environment is provided for aquaculture organisms.

[0101] II. Reduced Energy Consumption: The energy-saving water pump module optimizes water circulation, reduces energy consumption, and lowers operating costs.

[0102] Third, achieve environmentally friendly discharge: The wastewater treatment module deeply purifies aquaculture wastewater, ensuring that discharge meets environmental standards and reducing environmental pollution.

[0103] IV. Resource Recycling: The regeneration service module regenerates the adsorbent, reducing operating costs and achieving sustainable resource utilization.

[0104] V. Stable and efficient system: The integrated connection module integrates various functional modules to ensure efficient and coordinated operation of the system and improve overall operational stability.

[0105] The above-disclosed embodiments are merely preferred embodiments of the water purification device for a high-density recirculating aquaculture system of the present invention. Of course, they should not be construed as limiting the scope of the present invention. Those skilled in the art can understand that all or part of the processes of the above embodiments can be implemented, and equivalent changes made in accordance with the claims of the present invention are still within the scope of the invention.

Claims

1. A water purification device for a high-density recirculating aquaculture system, characterized in that, It includes a particle filtration module, a two-stage nitrification module, a dissolved oxygen control module, an energy-saving water pump module, a wastewater treatment module, a regeneration service module, and an integrated connection module; the particle filtration module, the two-stage nitrification module, the dissolved oxygen control module, the energy-saving water pump module, the wastewater treatment module, and the regeneration service module are connected in sequence and are respectively connected to the integrated connection module; The particle filtration module is used to efficiently remove suspended particulate matter from water and purify the water quality. Two-stage nitrification modules are used to effectively remove ammonia nitrogen and nitrite from water, reducing water toxicity; The dissolved oxygen control module is used to regulate the dissolved oxygen content in the water. The energy-saving water pump module is used to reduce energy consumption in circulating water. The wastewater treatment module is used for deep treatment of aquaculture wastewater to remove harmful substances; The regeneration service module is used for the regeneration of the adsorbent to restore its adsorption performance. The integrated connection module is used to integrate various functional modules to achieve efficient collaborative operation of the system.

2. The water purification device for the high-density recirculating aquaculture system as described in claim 1, characterized in that, The particle filtration module includes a magnetic filter unit, a water pump power unit, a backwashing unit, and a filtration status monitoring unit. The magnetic filter unit is used to remove fine suspended particles from water through magnetic adsorption. The water pump power unit is used to provide the power for water flow and drive water through the filter screen; The backwashing unit is used to clean the filter screen regularly to prevent clogging; The filter status monitoring unit is used to monitor the filter's clogging status in real time and prompt the user to take maintenance measures.

3. The water purification device for the high-density recirculating aquaculture system as described in claim 1, characterized in that, The two-stage nitrification module includes an aerobic reaction tank unit, an anoxic reaction tank unit, a carbon source addition unit, and a dissolved oxygen adjustment unit; The aerobic reaction tank unit is used to promote the growth of nitrifying bacteria and remove ammonia nitrogen; The anoxic reaction tank unit is used to promote the growth of denitrifying bacteria and remove nitrite; The carbon source addition unit is used to supplement the denitrification reaction with organic carbon source to improve the denitrification efficiency; The dissolved oxygen regulation unit is used to precisely control the dissolved oxygen levels in the aerobic and hypoxic zones.

4. The water purification device for the high-density recirculating aquaculture system as described in claim 1, characterized in that, The dissolved oxygen control module includes a dissolved oxygen sensor unit, an oxygenation and aeration unit, and a control algorithm unit. The dissolved oxygen sensor unit is used to monitor the dissolved oxygen concentration in the water in real time; The oxygenation and aeration unit is used to regulate the dissolved oxygen content in the water. The control algorithm unit is used to intelligently control the operation of the oxygenation and aeration unit based on feedback from the dissolved oxygen sensor.

5. The water purification device for a high-density recirculating aquaculture system as described in claim 1, characterized in that, The energy-saving water pump module includes a high-efficiency water pump unit, a fluid dynamics optimization unit, and an energy consumption monitoring unit; The high-efficiency water pump unit is used to efficiently drive water circulation; The fluid dynamics optimization unit is used to reduce energy loss of water in the pipeline; The energy consumption monitoring unit is used to monitor the energy consumption of the water pump in real time.

6. The water purification device for a high-density recirculating aquaculture system as described in claim 1, characterized in that, The wastewater treatment module includes a three-phase separation unit, an adsorption filtration unit, a wastewater discharge unit, and an adsorbent saturation monitoring unit. The three-phase separation unit is used to separate solids, liquids and gases in the effluent; The adsorption filtration unit is used for deep purification of effluent, removing organic matter and harmful substances; The tailwater discharge unit is used to discharge the treated tailwater in compliance with standards. The adsorbent saturation monitoring unit is used to monitor the adsorption state of the adsorbent material.

7. The water purification device for a high-density recirculating aquaculture system as described in claim 1, characterized in that, The regeneration service module includes an adsorbent regeneration unit, a carbon source recovery unit, and a regeneration status monitoring unit. The adsorbent regeneration unit is used to restore the adsorption capacity of the adsorbent material; The carbon source recovery unit is used to recover and recycle the carbon source in the wastewater treatment system. The regeneration status monitoring unit is used to monitor the regeneration status of the adsorbent and carbon source in real time.

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