A hanging water purification system for adult wuchang fish and a control method thereof

Abstract

The present application provides a kind of Wuchang fish adult fish hanging water clean culture system and control method thereof, belong to the field of adult fish culture, including several culture barrels using double working conditions;Edge control device identifies culture barrel working condition, and stops feeding for hanging water clean culture working condition;Edge control device carries out barrel level control according to the barrel level pollution load of hanging water clean culture working condition, and adjusts the operating parameter of MBBR device according to the total pollution load of system in hanging water clean culture working condition.The present application sets up double working condition control mechanism, so that the system can identify that the culture barrel is currently in growth period culture working condition or adult fish hanging water clean culture working condition, and corresponding control strategy is called respectively.When culture barrel enters hanging water clean culture working condition, edge control device automatically closes feeding function, avoids residual feed accumulation and water pollution caused by traditional culture program continuous feeding, adjusts equipment operation logic according to the demand of hanging water clean culture, so that culture barrel changes from growth promotion mode to clean culture environment mode.

Description

Technical Field

[0001] This invention relates to the field of adult fish farming technology, and in particular to a water purification system for adult Wuchang bream and its control method. Background Technology

[0002] As aquaculture develops towards intensification and large-scale operations, land-based recirculating aquaculture systems (RAS) are gradually becoming an important method for freshwater fish farming due to their advantages such as small footprint, high water resource utilization, and controllable aquaculture environment. These systems typically use circular tanks as the fish culture medium and continuously purify the aquaculture water through a recirculating water treatment system. This includes solid-liquid separation, biofilm treatment, oxygenation regulation, and water quality monitoring to maintain water quality stability.

[0003] Wuchang bream, an important freshwater economic fish in my country, typically requires a suspended water purification treatment before being marketed. This process reduces intestinal contents, diminishes the muddy taste, and improves meat quality. Existing factory-style recirculating aquaculture systems are primarily designed for the continuous feeding and rearing process during fry cultivation and adult fish growth. Their control logic is usually established around factors such as feed input, growth rate, and water quality maintenance. However, the suspended water purification stage for adult fish differs significantly from the normal rearing stage. During suspended water purification, the fish need to stop feeding and rely on a continuous flowing water environment to promote the excretion of metabolic waste. Therefore, it places higher demands on water cleanliness, dissolved oxygen stability, and pollutant removal efficiency.

[0004] In existing technologies, some recirculating aquaculture systems still use a single operating mode to control the rearing tanks, without establishing independent control logic for the growth stage and the adult fish purification stage. When the adult fish enter the purification stage, if the growth stage rearing mode is continued, the feeding program may not be shut off, leading to accidental feeding, causing residual feed to enter the rearing tank and decompose rapidly, resulting in increased concentrations of pollutants such as ammonia nitrogen and nitrite, thus affecting the purification effect. At the same time, because traditional systems usually use uniform water quality thresholds and uniform equipment operating parameters, they cannot adapt to the characteristics of high-density whole-tank stocking, lack of net isolation, and concentrated release of pollutants during the purification stage.

[0005] Therefore, existing land-based recirculating aquaculture systems cannot establish an independent multi-parameter collaborative control mechanism for the water purification process of adult Wuchang bream. This results in the inability to dynamically match changes in the pollution load of the water purification tank with the tank-level regulation and the biochemical treatment capacity of the recirculating water, thereby failing to improve the water quality stability and the consistency of the finished fish quality during the water purification process. Summary of the Invention

[0006] In view of this, the present invention proposes a water purification system for adult Wuchang bream and its control method, which is used to solve the problem that existing land-based factory-style recirculating aquaculture systems cannot establish an independent multi-parameter collaborative control mechanism for the water purification process of adult Wuchang bream, resulting in the inability to dynamically match the changes in pollution load of the water purification tank with the tank-level regulation and the biochemical treatment capacity of the recirculating water.

[0007] The technical solution of this invention is implemented as follows: This invention provides a Wuchang bream adult water-cooled rearing system, including several rearing tanks, respectively used for growth period conditions and water-cooled rearing conditions; an edge control device, used to identify the operating conditions of the rearing tanks and stop feeding the rearing tanks in the water-cooled rearing condition; and an MBBR device; wherein, the edge control device performs tank-level control according to the tank-level sewage discharge load of each rearing tank in the water-cooled rearing condition, and adjusts the operating parameters of the MBBR device according to the total sewage discharge load of the several rearing tanks in the water-cooled rearing condition.

[0008] Based on the above technical solutions, preferably, a data acquisition device is also included to collect water body operation parameters and fish activity status parameters of the aquaculture tank; wherein, the edge control device calculates the tank-level sewage discharge load based on the water body operation parameters and fish activity status parameters.

[0009] More preferably, the fish activity state parameters include at least one of the following: fish swimming speed, degree of aggregation, spatial distribution uniformity, and consistency of swimming direction.

[0010] Based on the above technical solutions, preferably, it also includes an execution device for adjusting the flow intensity, oxygenation intensity, and disinfection operation status of the aquaculture tank; wherein, the edge control device adjusts the flow intensity, oxygenation intensity, and disinfection operation status of each aquaculture tank in the suspended water purification and aquaculture operation state according to the tank-level sewage discharge load.

[0011] Based on the above technical solutions, preferably, the MBBR device includes an aeration regulating unit for regulating the dissolved oxygen in the aquaculture tank; a carbon source addition unit for supplying organic carbon to the denitrifying bacteria in the aquaculture tank; wherein, the edge control device changes the fluidization state of the MBBR packing by adjusting the aeration intensity, and synchronously adjusts the aeration intensity and carbon source addition amount according to the total sewage load of the system.

[0012] In a further preferred embodiment, the edge control device establishes a temperature compensation model, determines the compensation coefficient of the MBBR device based on the circulating water temperature in the aquaculture tank and the total sewage load of the system, and adjusts the operating parameters of the aeration regulating unit and the carbon source addition unit according to the compensation coefficient.

[0013] Based on the above technical solutions, the preferred approach is to establish a risk assessment model for suspended water purification and maintenance using the edge control device. This model determines the risk level of the corresponding suspended water purification and maintenance conditions based on the tank-level sewage discharge load and the activity status of the fish population, and adjusts the operating status of the tank-level actuator according to the risk level.

[0014] In an even more preferred embodiment, when the risk level reaches a preset level, the edge control device increases the circulating water exchange flow rate of the aquaculture tank in the suspended water purification state and outputs alarm information.

[0015] On the other hand, the present invention also provides a control method for a suspended water purification system for adult Wuchang bream. Using the aforementioned suspended water purification system for adult Wuchang bream, the method includes the following steps: S1, identifying the current operating condition of the rearing tanks; S2, loading corresponding control parameters according to the operating condition of the rearing tanks, and disabling the feeding function when the rearing tanks are identified as being in suspended water purification mode; S3, collecting the operating parameters of each rearing tank in suspended water purification mode and calculating the tank-level sewage load; S4, adjusting the operating state of the corresponding rearing tanks according to the tank-level sewage load; S5, summarizing the tank-level sewage loads of several rearing tanks in suspended water purification mode to form the total system sewage load, and adjusting the circulating water biological treatment capacity according to the total system sewage load; S6, determining the risk level based on the tank-level sewage load and the fish activity status, and performing corresponding controls according to the risk level.

[0016] Based on the above technical solutions, preferably, the edge control device determines the control priority of the corresponding aquaculture tank according to the proportion of the tank-level sewage discharge load of each aquaculture tank in the water purification and aquaculture operation to the total sewage discharge load of the system, and dynamically allocates the circulating water biochemical treatment capacity and the adjustment resources of the tank-level actuators according to the control priority.

[0017] The water purification and rearing system for adult Wuchang bream and its control method of the present invention have the following advantages over the prior art: (1) This invention sets up a dual-condition control mechanism, enabling the system to identify whether the culture tank is currently in the growth stage or the adult fish suspending water purification stage, and to call the corresponding control strategies accordingly. When the culture tank enters the suspending water purification stage, the edge control device automatically shuts off the feeding function, avoiding the accumulation of uneaten feed and water pollution caused by continuous feeding in traditional culture programs. At the same time, the device operation logic is readjusted according to the suspending water purification needs, so that the culture tank changes from the growth promotion mode to the purification environment mode, solving the problem that the existing circulating water system cannot adapt to the adult fish suspending water purification stage, and improving the stability of the suspending water purification process.

[0018] (2) This invention establishes a tank-level sewage load evaluation model by collecting water body operation parameters and fish activity status parameters, without relying on a single water quality index for control. This model comprehensively considers the changing trends of water pollutants, the swimming status of fish, the degree of fish aggregation, and spatial distribution changes, enabling the system to identify the stress state of fish and the changing trend of pollution load in advance. When the pollution load of a certain suspended water purification tank increases, the edge control device only adjusts the flow intensity, oxygenation intensity, and circulation treatment status for that tank, without changing the operating parameters of all aquaculture tanks, reducing the impact of local water quality abnormalities on the entire batch of adult fish, and improving the consistency of suspended water purification quality.

[0019] (3) This invention calculates the sewage discharge load of each water purification tank and summarizes it to form the total sewage discharge load of the system, enabling the MBBR device to dynamically adjust its operating status according to the actual pollution treatment needs. When the total sewage discharge load of the system increases, the edge control device simultaneously increases the aeration intensity and carbon source dosage of the MBBR device to improve the nitrification and denitrification treatment capacity; when the total sewage discharge load of the system decreases, the corresponding operating parameters are reduced, so as to realize the circulating water treatment system operating on demand, which can avoid the problems of insufficient biological treatment capacity or excessive energy consumption and improve the operating efficiency of the circulating water system.

[0020] (4) This invention establishes a temperature compensation model, using the changes in circulating water temperature and the total system wastewater load as the basis for adjusting MBBR operating parameters. Under low-temperature conditions, the system can automatically increase aeration intensity, improve oxygen transfer efficiency by enhancing the fluidization state of the packing material, and simultaneously adjust the carbon source dosage to improve the microbial denitrification capacity under low-temperature conditions. Therefore, even under low-temperature conditions in winter and spring, it can reduce the risk of ammonia nitrogen accumulation caused by decreased nitrification efficiency and improve the continuous operation capability of the suspended water purification process.

[0021] (5) This invention establishes a risk assessment model for suspended water purification and breeding, which integrates the sewage discharge load at the tank level, the activity status of the fish school, and the water body operation status for analysis. When the system detects abnormal fish behavior or a continuous upward trend in pollution load, it can increase the circulating water treatment flow rate in advance, adjust the operating parameters of the actuator, and output alarm information to achieve early risk identification and proactive control, thereby reducing the loss of adult fish caused by sudden water quality deterioration.

[0022] (6) The present invention uses an edge control device for local real-time calculation and implements differentiated control according to the actual status of each aquaculture tank to avoid all equipment from maintaining high load operation for a long time. For aquaculture tanks with low pollution load, the system maintains basic operation status; for aquaculture tanks with high pollution load, priority is given to allocating circulation processing capacity and equipment adjustment resources. While ensuring the water purification effect, unnecessary equipment operation time can be reduced and the overall energy utilization efficiency of the recirculating aquaculture system can be improved. Attached Figure Description

[0023] 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.

[0024] Figure 1 This is a flowchart illustrating the control method of the present invention. Detailed Implementation

[0025] To enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification 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.

[0026] In the description of the embodiments of the present invention, words such as "for example" or "for instance" are used to indicate examples, illustrations, or explanations. Any embodiment or design described as "for example" or "for instance" in the embodiments of the present invention should not be construed as being more preferred or advantageous than other embodiments or designs. Rather, the use of words such as "for example" or "for instance" is intended to present the relevant concepts in a specific manner.

[0027] In the description of the embodiments of the present invention, the term "multiple" means two or more. For example, multiple systems means two or more systems, and multiple screen terminals means two or more screen terminals. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. The terms "comprising," "including," "having," and variations thereof all mean "including but not limited to," unless otherwise specifically emphasized.

[0028] This invention discloses a Wuchang bream adult rearing system, primarily applied in land-based recirculating aquaculture (RAS) workshops. It is suitable for production scenarios involving the rearing of Wuchang bream during their growth period and the suspending of adult fish for rearing in circular rearing tanks. The system includes rearing tanks, an edge control device, and an MBBR (Medium-Medium-Rich Blender) device.

[0029] Several culture tanks are used for both the growth period and the suspended water rearing period. Each culture tank forms a closed-loop circulating water treatment system with the MBBR unit through a circulating water pipeline. In practice, each culture tank adopts a circular tank structure and is divided into two periods according to different production stages: during the growth period, the culture tanks are used for the normal culture of Wuchang bream fry and medium-sized adult fish; during the suspended water rearing period, the culture tanks are used for the cessation of feeding and purging of adult Wuchang bream. No isolation structures such as hanging nets or cages are set up inside the tank, and the Wuchang bream are directly cultured at high density within the entire tank space.

[0030] MBBR refers to the MBBR (Moving Bed Biofilm Reactor) biochemical treatment system. It has been widely used in adult fish farming technology.

[0031] The edge control device is implemented using an industrial control computer, edge server, or PLC combined with an industrial computing platform. Internally, it has two independent operating logics: aquaculture mode control strategy and suspended water purification mode control strategy. The edge control device identifies the operating condition of the aquaculture tanks and stops feeding those tanks in suspended water purification mode. It performs tank-level control based on the tank-level wastewater load of each tank in suspended water purification mode and adjusts the operating parameters of the MBBR device based on the total system wastewater load of several tanks in suspended water purification mode.

[0032] In actual operation, when an operator switches a breeding tank from the growth stage to the suspended water purification stage, they can send a mode switching command via a touch screen, host computer, or mobile terminal. After receiving the mode switching command, the edge control device first confirms whether the current state of the corresponding breeding tank meets the suspended water purification conditions, such as confirming that the fish size has reached the set weight range, stopping the fish separation operation, and that the circulating water system is operating normally. After confirmation, the device automatically switches the breeding tank from the breeding mode to the suspended water purification mode.

[0033] After completing the switching of operating conditions, the edge control device immediately closes the control authority of the feeding equipment in the corresponding aquaculture tank, locking the feeding equipment. During the water purification period, even if the feeding time set in the original aquaculture program is reached, the system will not send a feeding control command to the corresponding aquaculture tank. From the control logic, this avoids continued feeding due to program erroneous triggering, thereby preventing uneaten feed from entering the aquaculture tank, causing rapid accumulation of ammonia nitrogen and water deterioration.

[0034] At the same time, the edge control device automatically calls the control strategy corresponding to the suspended water purification mode and stops executing the feeding control logic in the breeding mode, retaining only the control functions such as circulating water treatment, flow propulsion, oxygenation, water quality regulation and risk monitoring, so that the suspended water purification process always maintains a state of no feeding and flowing water purification.

[0035] During the water purification process, each breeding tank operates independently, but the edge control device adopts a dual-layer control method of "tank-level control + system-level linkage".

[0036] The tank-level control allows for independent adjustment of individual water-cooled and cleaned tanks. The edge control device acquires the current operating status of each water-cooled and cleaned tank in real time and calculates the corresponding tank-level sewage load. When the sewage load of a certain tank increases, only that tank is adjusted accordingly, without simultaneously changing the operating parameters of other water-cooled and cleaned tanks, thus avoiding unnecessary fluctuations in the operating parameters of the entire workshop due to local anomalies.

[0037] On the other hand, the edge control device simultaneously performs statistical analysis on all aquaculture tanks in the suspended water purification and maintenance mode, summarizing the tank-level sewage discharge load corresponding to each suspended water purification and maintenance tank to form the total system sewage discharge load. The total system sewage discharge load is used to reflect the current pollutant treatment pressure on the entire circulating water system, rather than the local pollution situation of a certain aquaculture tank.

[0038] The edge control device dynamically adjusts the operating parameters of the MBBR unit based on the total system wastewater load, ensuring that the actual processing capacity of the MBBR unit always matches the pollutant generation capacity during the current water purification phase. For example, when a large number of water tanks simultaneously enter the water purification phase, causing a rapid increase in the total system wastewater load, the edge control device automatically increases the operating capacity of the MBBR unit; conversely, when some water tanks finish water purification and exit operation, causing a decrease in the total system wastewater load, the device automatically reduces the operating capacity of the MBBR unit. This allows the circulating water system to operate on demand, reducing unnecessary energy consumption.

[0039] In one embodiment, a data acquisition device is also included.

[0040] The data acquisition device is used to collect water operation parameters and fish activity status parameters in the aquaculture tank. Specifically, the data acquisition device includes a water operation parameter acquisition unit and a fish activity status acquisition unit. Both types of acquisition units are communicatively connected to the edge control device and continuously upload data according to a preset sampling period. Water operation parameters may include dissolved oxygen, ammonia nitrogen, nitrite concentration, pH value, water temperature, and circulation flow rate, which reflect the current changes in the aquatic environment of the aquaculture tank. The fish activity status acquisition unit can use a wide-angle camera installed on the top or side wall of the aquaculture tank to continuously collect data on the activity of the fish inside the entire circular aquaculture tank. After receiving the image data, the edge control device can extract the fish movement contours using image recognition algorithms and further calculate the fish activity status parameters.

[0041] Since Wuchang bream stop feeding during the water purification stage, nitrogen pollutants in the tank mainly originate from fish excretion and metabolism. When the fish are stressed, their swimming behavior usually changes before water quality indicators. Therefore, in this embodiment, the tank-level sewage discharge load is calculated by an edge control device based on both water body operating parameters and fish activity status parameters, rather than relying solely on a single water quality indicator.

[0042] In practical operation, the edge control device first normalizes the operating parameters of each water body to eliminate dimensional differences between different physical quantities. Then, it standardizes the fish activity parameters to obtain behavioral characteristic values ​​that reflect the metabolic state of the fish. Next, a tank-level wastewater load model is established, using the water body operating parameters and fish activity parameters as common inputs, and calculating the tank-level wastewater load for the corresponding aquaculture tank through a weighted fusion method. The tank-level wastewater load can be represented using a weighted evaluation model as follows:

[0043] L i =α×W i +β×B i , Among them, L i W represents the tank-level sewage discharge load of the i-th suspended water purification tank; i B is the feature vector of water body operation parameters corresponding to the aquaculture tank; i The feature vector represents the activity state of the fish in the corresponding aquaculture tank; α is the weighting coefficient of the water body operation parameter, β is the weighting coefficient of the fish activity state parameter, and α+β=1. After training the model based on historical water purification data, α can be set to 0.55~0.75 and β can be set to 0.25~0.45 to ensure that the water quality change trend and the fish behavior change trend can both participate in the tank-level sewage load calculation.

[0044] Subsequently, the edge control module calculates the total sewage load of the system as follows: , Among them, L sum denoted as the total sewage discharge load of the system; n represents the number of aquaculture tanks currently in the water-cooling and clean-breeding state.

[0045] The edge control device updates the wastewater discharge load of each tank and the total system wastewater discharge load in real time, which serves as the basis for tank-level control and MBBR unit linkage control, respectively. Since the total system wastewater discharge load can comprehensively reflect the pollutant generation capacity of the entire workshop during the water purification and maintenance phase, it can more accurately coordinate the matching relationship between tank-level regulation and circulating water biochemical treatment capacity compared to the traditional method of control based solely on single tank water quality indicators, thus reducing the impact of local anomalies on the overall system control effect.

[0046] In one embodiment, the fish school activity state parameters include at least one of the following: swimming speed, aggregation degree, spatial distribution uniformity, and swimming direction consistency. Each parameter is acquired by the fish school activity state acquisition unit and calculated by the edge control device to form a fish school behavior feature vector.

[0047] In practice, the fish activity monitoring unit uses a wide-angle industrial camera positioned directly above the rearing tank. Alternatively, a combination of an underwater camera and a top-mounted camera can be used to ensure the entire interior of the circular rearing tank is within the camera's field of view, preventing incomplete fish behavior recognition due to obstruction from the tank's edges. The camera continuously captures video images at preset time intervals and transmits them to the edge control device for real-time analysis.

[0048] The edge control device first preprocesses the acquired images, including image distortion correction, brightness equalization, noise filtering, and tank region segmentation, retaining only the water images inside the tanks for subsequent analysis. Then, a target detection algorithm is used to identify the fish outlines, and a target tracking algorithm is combined to obtain the motion trajectories of each fish in the continuous images.

[0049] For example, the swimming speed of a school of fish can be calculated based on the positional changes of the same fish in two consecutive frames of images, and its average value can be expressed as: , Where V is the average swimming speed of the fish school; m is the number of fish detected; Δs j Δt represents the displacement of the j-th fish body between two consecutive frames; Δt is the sampling time interval.

[0050] Generally, under normal conditions of water purification and rearing, fish usually maintain a uniform and slow swimming motion. When the water quality deteriorates or dissolved oxygen decreases, the average swimming speed of the fish will decrease significantly, or some fish may escape rapidly. Therefore, swimming speed can reflect the stress level of the fish.

[0051] For example, the degree of fish aggregation is used to represent the aggregation state among fish. In this embodiment, the aggregation density can be obtained by calculating the number of fish per unit area, or it can be evaluated using the average distance between the center of gravity of the fish school and the position of each fish. When a large number of fish gather in a local area, it indicates that the fish school has begun to actively seek a suitable local aquatic environment, and at this time the degree of aggregation increases.

[0052] For example, spatial distribution uniformity is used to reflect the distribution of fish in the entire circular rearing tank. Edge control devices can divide the tank plane into several statistical zones, count the number of fish in each zone, and calculate the dispersion of fish distribution in each zone. When the fish are evenly distributed, the number of fish in each zone is similar; if a large number of fish are concentrated near the tank wall, in the aeration zone, or in the water intake zone, it indicates that a local anomaly has occurred in the aquatic environment.

[0053] For example, swimming direction consistency is used to describe the degree of uniformity in the movement direction of a school of fish. The edge control device counts the current movement direction of all fish and calculates a direction consistency coefficient. When the school of fish swims normally in a circular pattern, the movement direction of each fish is basically consistent; if a large number of fish exhibit disordered movement directions, it usually indicates that the school is under stress.

[0054] To comprehensively evaluate fish behavior, this embodiment further establishes a fish behavior index model. The edge control device first normalizes the above-mentioned behavioral parameters, then performs fusion calculations according to different weights, finally obtaining the fish behavior index B, which is as follows:

[0055] B=λ1×V+λ2×C+λ3×U+λ4×D, Where V is the normalized swimming speed of the fish school; C is the normalized aggregation degree; U is the spatial distribution uniformity; D is the consistency of swimming direction; λ1~λ4 are the corresponding weight coefficients, and satisfy λ1+λ2+λ3+λ4=1. The typical calculation formula uses λ1 values ​​of 0.35~0.45, λ2 values ​​of 0.25~0.35, λ3 values ​​of 0.15~0.25, and λ4 values ​​of 0.10~0.20.

[0056] The edge control device sends the calculated fish behavior index to the barrel-level sewage load model in real time. The index, together with the water body operation parameters, participates in the barrel-level sewage load calculation, enabling the fish behavior to reflect the changes in fish metabolism during the suspended water purification process in advance, and improving the system's ability to predict the trend of water quality deterioration.

[0057] In one embodiment, the system further includes an actuator that is communicatively connected to the edge control device and installed in each aquaculture tank.

[0058] The actuator is used to adjust the flow intensity, oxygenation intensity, and disinfection status of the aquaculture tank; in specific implementation, the actuator includes a flow propulsion device, an oxygenation device, and a water disinfection device.

[0059] The propulsion device uses a circumferential propulsion pump installed on the inner wall of the breeding tank. Its water outlet direction is arranged tangentially along the breeding tank, creating a continuous circumferential water flow inside the tank. The fish can maintain stable swimming under the action of the circulation, while fish excrement can gradually collect along the water flow to the bottom of the tank for waste disposal, reducing local sedimentation.

[0060] The oxygenation device uses micro-nano oxygenation equipment, which is set at the bottom of the breeding tank. By continuously releasing micro-nano bubbles, it increases the dissolved oxygen level of the circulating water and enhances the mixing of the upper and lower layers of water in the tank, reducing the risk of local hypoxia.

[0061] The water disinfection device uses ultraviolet disinfection equipment, or ozone-assisted disinfection, to continuously sterilize the water that flows back into the aquaculture tank, thereby reducing the number of microorganisms in the circulating water and improving the cleanliness of the water during the suspended water purification stage.

[0062] The edge control device adjusts the flow intensity, oxygenation intensity, and disinfection status of each aquaculture tank in the suspended water purification and aquaculture mode according to the tank-level sewage discharge load. Specifically, the edge control device first reads the current tank-level sewage discharge load of the corresponding aquaculture tank and compares it with the preset target load to calculate the current load deviation.

[0063] ΔL=L i -L0, Among them, L i L0 represents the current barrel-level sewage discharge load, while L0 represents the target sewage discharge load under the corresponding water purification and maintenance conditions.

[0064] When ΔL is within the normal range, the current flow intensity, oxygenation intensity, and disinfection operation status remain unchanged; when ΔL continues to increase, the edge control device gradually increases the operating power of the flow device according to the preset adjustment strategy, increases the circumferential flow velocity inside the tank, and allows pollutants to enter the circulating water treatment system more quickly.

[0065] Simultaneously, increasing the output power of the micro-nano oxygenation equipment maintains dissolved oxygen within a suitable range in the aquaculture tank, reducing stress responses in the fish caused by decreased dissolved oxygen. When the tank-level sewage discharge load continues to increase and the fish behavior index decreases simultaneously, the edge control device further extends the operating time of the water disinfection device or increases the operating frequency of the disinfection equipment to reduce the content of bacteria and organic pollutants in the circulating water and improve the stability of the aquatic environment during the suspended water purification stage.

[0066] To avoid frequent start-stop cycles of the actuators, this embodiment further sets a control hysteresis range. When the barrel-level sewage load fluctuates near the target range, the edge control device maintains the current operating state of the actuators, and only initiates the corresponding adjustment action after the barrel-level sewage load exceeds the preset adjustment threshold for multiple consecutive sampling cycles; when the barrel-level sewage load returns to normal, the recovery conditions must be met continuously for a certain period of time before the flow intensity, oxygenation intensity, and disinfection operation intensity can be reduced.

[0067] Through the above control method, each suspended water purification tank can be independently adjusted according to its own operating status without uniformly increasing the operating parameters of all breeding tanks in the entire workshop. This achieves precise tank-level control, ensuring the stability of the water environment during suspended water purification, reducing the overall energy consumption of the system, and improving the efficiency of circulating water treatment.

[0068] In one embodiment, the MBBR device includes an aeration regulating unit and a carbon source dosing unit, both of which are connected to an edge control device and are coordinated and regulated according to the total sewage load of the system.

[0069] The MBBR (Medium-Liquid Bioreactor) unit is located within the circulating water treatment system. Its front end is connected to a solid-liquid separator, and its rear end is connected to a return water pipeline. The circulating water discharged from each aquaculture tank first enters the solid-liquid separator to remove suspended particles and large solid particles from fish excrement. Then, it enters the MBBR unit for biological treatment. The purified circulating water is then returned to each aquaculture tank. The MBBR unit contains suspended biological packing material with a large number of nitrifying and denitrifying bacteria attached to its surface. As the circulating water flows through the MBBR unit, ammonia nitrogen, nitrite, and nitrate in the water are gradually converted through nitrification and denitrification reactions, thereby reducing the concentration of nitrogenous pollutants in the circulating water.

[0070] The aeration regulating unit is used to adjust the dissolved oxygen levels in the aquaculture tank. Specifically, the aeration regulating unit includes a blower, a main aeration pipe, branch aeration pipes, aerators, and a frequency converter. The edge control device adjusts the aeration volume by controlling the output frequency of the blower, thereby changing the dissolved oxygen level in the MBBR reactor. Under normal water purification conditions, the aeration regulating unit maintains the basic aeration intensity, ensuring a stable aerobic environment for the MBBR device. When the total system wastewater load increases, the edge control device gradually increases the blower output frequency, increasing the aeration volume, allowing more oxygen to enter the reactor, increasing the metabolic rate of nitrifying bacteria, and enhancing ammonia nitrogen oxidation capacity. On the other hand, with enhanced aeration, a large number of air bubbles continuously pass through the biological packing layer, causing the suspended packing to continuously tumble within the reactor. As the packing continuously collides and tumbles, the biofilm on the packing surface continuously receives fresh oxygen and nutrients, while aging biofilm continuously sheds and renews itself, thereby improving oxygen transfer efficiency and increasing biofilm activity. Therefore, this embodiment utilizes changes in aeration volume to alter the fluidization state of the packing, enabling the aeration regulating unit to simultaneously perform both oxygen supply and packing fluidization functions.

[0071] The carbon source dosing unit is used to supply organic carbon to the denitrifying bacteria in the aquaculture tank. Specifically, the carbon source dosing unit includes a carbon source storage tank, a metering pump, a flow regulating valve, and dosing pipelines. The edge control device calculates the current carbon source demand for denitrification based on the total system wastewater load and controls the metering pump to continuously add organic carbon source to the MBBR unit. In this embodiment, the organic carbon source can be any organic matter that can be utilized by denitrifying bacteria, such as sodium acetate, glucose, methanol, ethanol, or molasses. When the total system wastewater load increases, the concentration of nitrogenous pollutants entering the MBBR unit increases simultaneously. At this time, the edge control device increases the carbon source dosing rate to provide sufficient electron donors for the denitrifying bacteria and improve the efficiency of nitrate to nitrogen conversion. To avoid excessive carbon source dosing causing an increase in circulating water COD, the edge control device further establishes a dynamic carbon source matching strategy. The edge control device changes the fluidization state of the MBBR packing by adjusting the aeration intensity and synchronously adjusts the aeration intensity and carbon source dosing amount according to the total system wastewater load.

[0072] First, the initial amount of carbon source added is determined according to the following formula: Q c =k1×L sum , Among them, Q c L is the initial amount of carbon source added. sum denoted as the total system discharge load; k1 is the carbon source demand coefficient. If sodium acetate is used as the carbon source, the value is generally 0.8 to 1.5. If glucose is used as the carbon source, the value is generally 1.1 to 1.8.

[0073] Further adjustments were then made based on the real-time reflux water quality. Q=Q c ×K c , Where Q is the actual carbon source addition, and K c This is the carbon source correction factor, with a value ranging from 0.90 to 1.10.

[0074] The edge control device continuously monitors the system's operating status and performs closed-loop correction of the carbon source dosage, ensuring that the MBBR unit always maintains high denitrification efficiency while avoiding carbon source waste.

[0075] In one embodiment, since the purging of Wuchang bream is typically carried out in Hubei Province during autumn and winter, and winter and spring, the metabolic rate of nitrifying bacteria in the MBBR device decreases significantly when the circulating water temperature is low, resulting in a reduction in ammonia nitrogen removal capacity per unit time. Therefore, this embodiment further establishes a temperature compensation model to dynamically correct the operating parameters of the MBBR device. The compensation coefficient of the MBBR device is determined based on the circulating water temperature in the breeding tank and the total system wastewater load, and the operating parameters of the aeration regulating unit and the carbon source addition unit are adjusted according to the compensation coefficient.

[0076] Specifically, the edge control device collects the circulating water temperature in real time and calculates the current biochemical treatment capacity requirement in conjunction with the total system wastewater load. In this embodiment, the edge control device first establishes a temperature influence factor based on the circulating water temperature:

[0077] , Among them, F T T represents the temperature influence factor; T is the current circulating water temperature; T r The reference temperature is set; k is the temperature decay coefficient, which is generally taken as 0.05~0.08 based on experience.

[0078] When the circulating water temperature decreases, the temperature influence factor decreases, indicating a reduction in the unit treatment capacity of the MBBR unit. Subsequently, a compensation model is established for the total wastewater load and temperature influence factor of the integrated system of the edge control device:

[0079] K=F T / L sum , Where K is the comprehensive compensation coefficient of the MBBR device.

[0080] When the total system wastewater load is low and the water temperature is normal, the compensation coefficient remains small, and the system operates according to the basic operating parameters. As the circulating water temperature decreases or the total system wastewater load increases, the comprehensive compensation coefficient gradually increases. The edge control device adjusts the aeration intensity and carbon source dosage according to the compensation coefficient.

[0081] A = A0 × K, Q = Q0 × K, Where A is the corrected aeration intensity; A0 is the basic aeration intensity; Q is the corrected carbon source dosage; and Q0 is the basic carbon source dosage.

[0082] To avoid frequent adjustments to the MBBR device due to short-term temperature fluctuations, this embodiment incorporates a temperature compensation buffer mechanism. The edge control device continuously acquires the circulating water temperature over multiple sampling periods and calculates the moving average temperature as follows:

[0083]

[0084] in, The average circulating water temperature is T; n is the statistical period. i Let be the circulating water temperature of the i-th aquaculture tank.

[0085] The edge control device uses the average circulating water temperature in the compensation coefficient calculation. Only when the average circulating water temperature is continuously lower than the set temperature range will the aeration intensity and carbon source dosage be gradually increased. Once the average circulating water temperature returns to normal, the basic operating parameters are gradually restored according to the preset gradient. Using this temperature compensation model, the MBBR device can automatically adjust its operating capacity based on changes in circulating water temperature, ensuring that the circulating water biochemical treatment capacity remains dynamically matched to the pollutant generation capacity during the purification stage. Especially under low-temperature conditions, increasing aeration intensity enhances the fluidization state of the packing material, promoting oxygen transfer and biofilm renewal. Simultaneously, combined with precise carbon source dosage, it improves nitrification and denitrification reaction efficiency, effectively reducing the risk of ammonia nitrogen accumulation under low-temperature conditions and improving water quality stability during the purification process.

[0086] In one embodiment, to avoid the problem that traditional recirculating aquaculture systems rely solely on water quality indicators for post-event control and cannot identify fish stress and water quality deterioration trends during the suspended water purification process, this embodiment further establishes a suspended water purification risk assessment model. By integrating the tank-level sewage discharge load and fish activity status, the operational risk of each suspended water purification tank is evaluated in real time, and corresponding control measures are implemented according to the risk level.

[0087] Specifically, the edge control device pre-establishes a risk assessment model for suspended water purification, which takes the barrel-level sewage discharge load, fish activity status parameters, and water body operation status parameters as inputs and the suspended water purification risk level as output.

[0088] Among them, the barrel-level sewage discharge load is used to reflect the pollutant generation capacity of the current aquaculture barrel per unit time, which can characterize the potential pressure of pollutants such as ammonia nitrogen and nitrite entering the circulating water system; the fish activity status is used to reflect the real-time response of Wuchang fish to the current water environment changes; and the water body operation status parameters are used to reflect whether the current circulating water environment is in a stable state.

[0089] Specifically, the edge control device first normalizes each input parameter, converting different physical quantities into dimensionless characteristic values: , in, The normalized parameter value; X i X represents the currently collected parameters. max and X min These are the historical maximum and minimum values ​​for the corresponding parameters.

[0090] Then, a risk assessment index R is established based on the weighting ratio of each parameter; each parameter includes the characteristic value of the barrel-level sewage discharge load, the characteristic value of fish activity status, and the characteristic value of water body operation status. The risk assessment index R is expressed as follows:

[0091] R = a × Li +b×B i +c×W i , Wherein, R is the risk assessment index for running water purifying culture; L i is the characteristic value of barrel-level pollution discharge load; B i is the characteristic value of fish school activity status; W i is the characteristic value of water body operation status; a, b and c are corresponding evaluation weights respectively, and satisfy a+b+c=1, a ranges from 0.45 to 0.60, b ranges from 0.25 to 0.35, and c ranges from 0.15 to 0.25.

[0092] The weight of each parameter can be obtained through training based on historical running water purifying culture data. For example, in the initial stage of running water purifying culture, since fish schools have just been transferred to a new environment and their behavioral changes are relatively sensitive, the weight of the fish school activity status parameter can be appropriately increased; in the later stage of running water purifying culture, as metabolites continue to accumulate, the weight of the barrel-level pollution discharge load parameter can be increased.

[0093] Furthermore, in this embodiment, multiple risk levels are divided according to the risk assessment index R. For example, a first-level risk state R1 is set. When R<R1, it indicates that the running water purifying culture barrel is in a normal operation state. At this time, the edge control device maintains the current push flow intensity, aeration intensity and circulating water treatment parameters without additional intervention.

[0094] For another example, a second-level risk state R2 is set. When R1≤R<R2, it indicates that the running water purifying culture barrel has a potential trend of water quality deterioration. At this time, the edge control device increases the push flow intensity and aeration intensity of the corresponding culture barrel, improves the delivery efficiency of pollutants to the circulating water treatment system, and increases the monitoring frequency at the same time.

[0095] For another example, a third-level risk state R3 is set. When R≥R2, it indicates that the running water purifying culture barrel already has obvious water quality risks. At this time, the edge control device starts an enhanced control strategy, including increasing the circulating water exchange flow rate, improving the treatment capacity of the MBBR device and outputting alarm information.

[0096] Of course, in the actual operation process, the risk level is not determined only based on a single detection result, but an evaluation method of multiple consecutive sampling cycles is adopted. For example, when the ammonia nitrogen index of a certain running water purifying culture barrel increases in a short time, but the fish school activity is normal and the pollution discharge load does not increase continuously, the system will not immediately determine it as a high-risk state, but will continue to observe; when the increase of ammonia nitrogen is accompanied by a decrease in the swimming speed of fish schools, an increase in the degree of aggregation and a continuous increase in the barrel-level pollution discharge load, it is determined as a risk trend, and regulation is implemented in advance.

[0097] In this embodiment, fish behavior changes are used as an early warning signal for water quality deterioration. This allows for prediction and control of pollution trends, avoiding the shortcomings of traditional methods that only address pollution after it occurs.

[0098] In one embodiment, when the risk level reaches a preset level, the edge control device increases the circulating water exchange flow rate of the aquaculture tank in the suspended water purification and maintenance state, and outputs an alarm message. The circulating water exchange flow rate refers to the circulation treatment flow rate between the suspended water purification and maintenance tank and the circulating water treatment system, that is, the amount of water in the aquaculture tank that enters the solid-liquid separation device and the MBBR device, is treated, and then returns to the aquaculture tank per unit time.

[0099] When the risk level output by the risk assessment model reaches the preset level, the edge control device first calculates the deviation between the current cyclic processing flow and the target processing flow.

[0100] Subsequently, the edge control device gradually increases the circulating flow rate by adjusting the frequency of the circulating pump, the opening of the flow regulating valve, or the bypass regulating mechanism.

[0101] At the same time, increasing the circulation flow rate can also enhance the water renewal speed in the aquaculture tank, allowing the metabolic products accumulated in local areas to be discharged quickly and improving the activity environment of the fish.

[0102] To avoid the fish being impacted by the water flow due to a sudden increase in the circulation flow rate, this embodiment adopts a graded adjustment method. Specifically: when the risk level first reaches a preset threshold, the edge control device increases the circulation flow rate according to a first adjustment ratio; if the risk index does not decrease after a set time, the circulation flow rate is further increased; if the risk is eliminated, the system gradually returns to normal operation according to a preset decreasing gradient.

[0103] Furthermore, when the risk level reaches the alarm level, the edge control device simultaneously generates alarm information and sends it to the management terminal via on-site alarm equipment and remote communication devices. The alarm information includes at least the risk tank number, current risk level, current tank-level wastewater load, current water quality status, and implemented control measures. Management personnel can then promptly take measures such as manual inspection, fish relocation, or equipment maintenance based on the alarm information.

[0104] Through the aforementioned risk assessment and response mechanism, this embodiment can adjust the circulation treatment capacity in advance before significant water quality deterioration occurs in the suspended water purification tank, avoiding stress reactions in the entire batch of adult fish due to the accumulation of pollution in a single tank, and improving the stability of the suspended water purification process and the consistency of product quality.

[0105] like Figure 1 As shown, the control method of the adult Wuchang bream suspending and purifying water system of the present invention, using any of the above embodiments of the adult Wuchang bream suspending and purifying water system, includes the following steps: S1 identifies the current operating status of the aquaculture tanks. Specifically, during system operation, the edge control device first acquires the current operating status information of each aquaculture tank. This operating status information may include: tank number; current aquaculture stage; fish size information; feeding status; and mode switching commands input by the operator.

[0106] The edge control device determines whether the corresponding breeding tank is in the growth stage or the suspended water purification stage based on the above information. When the breeding tank is used for seedling cultivation, medium and adult fish farming and is kept in a normal feeding state, the system marks it as the breeding mode; when the finished Wuchang fish are transferred to a special suspended water tank and need to be stopped from feeding for purification, the system receives the suspended water purification mode switching command and marks the corresponding breeding tank as the suspended water purification mode.

[0107] Since the fish's metabolic state, water quality control targets, and equipment operation requirements are different under the aquaculture mode and the suspended water purification mode, this embodiment achieves automatic switching of different control logics through operating condition identification.

[0108] S2 loads the corresponding control parameters based on the operating conditions of the aquaculture tank and shuts off the feeding function when the aquaculture tank is identified as being in the water purification and aquaculture mode. Specifically, after the edge control device completes the operating condition identification, it calls the preset control parameters according to the corresponding operating condition. When the aquaculture tank is in the growth stage aquaculture mode, the system calls the aquaculture mode control parameters, including: feeding time; feeding amount; normal aeration parameters; and normal water quality control parameters.

[0109] When the aquaculture tank switches to the suspended water purification mode, the system calls up the suspended water purification control parameters. Since the core purpose of the suspended water purification stage is to reduce intestinal contents and metabolic residues in the fish, thereby improving fish meat quality, it is necessary to maintain a state of no feeding. Therefore, after the mode switch is completed, the edge control device sends a lock command to the feeding equipment control interface, causing the feeding equipment to stop operating.

[0110] The entire process can be summarized as follows: the edge control device generates a feeding prohibition signal; upon receiving this signal, the feeding control device disconnects the feeding execution permission; even if the original feeding program reaches the set time, the feeding action cannot be restarted. This combination of hardware and software control avoids the problem of continued feeding during the water-suspending period due to human error or the original aquaculture program not being modified.

[0111] S3 collects the operating parameters of each aquaculture tank in the suspended water purification mode and calculates the tank-level sewage discharge load. During the operation of the suspended water purification mode, the edge control device acquires the operating data of each suspended water purification tank according to the set sampling period.

[0112] The collected data includes: (1) Water body operating parameters: ammonia nitrogen concentration; nitrite concentration; dissolved oxygen concentration; water temperature; pH value; circulation treatment flow rate.

[0113] (2) Fish activity parameters: swimming speed; degree of aggregation; spatial distribution uniformity; and consistency of swimming direction.

[0114] The edge control device filters and normalizes the collected data to eliminate the impact of instantaneous fluctuations. Subsequently, the processed water body operating parameters and fish activity parameters are input into the tank-level wastewater load model. This model comprehensively considers factors such as pollutant generation capacity, fish metabolic status, and current water environment pressure. The calculated tank-level wastewater load is used to determine the pollution pressure of a single tank and serves as the basis for subsequent tank-level equipment adjustments.

[0115] S4 adjusts the operating status of the corresponding aquaculture tank based on the tank-level sewage discharge load. The edge control device independently controls each suspended water purification tank. When the tank-level sewage discharge load of a certain suspended water purification tank increases, it indicates that the rate of generation of fish metabolic products in that tank increases, and the rate at which pollutants enter the circulating water system increases.

[0116] At this time, the edge control device prioritizes adjusting the actuator corresponding to the bucket. Specifically, this includes:

[0117] (1) Adjust the flow intensity and increase the operating power of the flow equipment to form a more stable circumferential water flow in the tank, promote the migration of pollutants to the sewage discharge area, and improve the efficiency of pollutants entering the circulating water treatment system.

[0118] (2) Adjust the oxygenation intensity, increase the output power of the oxygenation equipment, increase the dissolved oxygen level in the tank, and reduce the stress caused by oxygen deficiency in the fish.

[0119] (3) Adjust the water disinfection operation status. When the pollution load continues to rise, increase the operation time of the disinfection equipment and reduce the number of microorganisms in the circulating water.

[0120] By using the above method, the equipment of a single tank can be adjusted according to the change in the pollution pressure of the single tank, thus avoiding the problem of insufficient processing capacity or energy waste in some tanks caused by the use of uniform parameter control in traditional systems.

[0121] S5 aggregates the wastewater discharge load of several aquaculture tanks under suspended water purification conditions to form the total wastewater discharge load of the system, and adjusts the circulating water biological treatment capacity according to the total wastewater discharge load of the system. After completing the tank-level wastewater discharge load calculation for each suspended water purification tank, the edge control device further aggregates the pollution load of all suspended water purification tanks.

[0122] The total system wastewater load reflects the total amount of pollutants that the entire circulating water system currently needs to treat. The edge control device adjusts the MBBR unit's operating parameters based on the total system wastewater load.

[0123] When the total sewage load of the system increases, increase the aeration intensity, increase the oxygen supply inside the MBBR, enhance the activity of nitrifying bacteria, and increase the carbon source dosage according to the increase in nitrogen load to improve denitrification capacity.

[0124] When the total sewage load of the system decreases, the aeration intensity and the amount of carbon source added are gradually reduced to keep the MBBR unit in an economical operating state.

[0125] S6 determines the risk level based on the tank-level sewage load and fish activity status, and executes corresponding controls according to the risk level. The edge control device establishes a risk assessment based on the tank-level sewage load, fish activity status, and water body operation parameters, and outputs the risk level through the risk assessment model: when the risk level is low, the current operating status is maintained; when the risk level increases, the circulation treatment flow rate of the corresponding aquaculture tank is increased, the flow propulsion and aeration capacity are improved, and the monitoring frequency is increased; when the alarm level is reached, an alarm message is output to remind the management personnel to conduct manual inspection.

[0126] This embodiment achieves automatic control of the entire process of water purification and maintenance through the above steps.

[0127] In one embodiment, the edge control device determines the control priority of the corresponding aquaculture tank based on the proportion of the tank-level sewage discharge load of each aquaculture tank in the water purification and maintenance condition to the total sewage discharge load of the system, and dynamically allocates the circulating water biochemical treatment capacity and the adjustment resources of the tank-level actuators according to the control priority.

[0128] During simultaneous water purification in multiple tanks, the pollution load generated by each tank is not entirely the same due to differences in the number and condition of fish, as well as environmental conditions. If an average distribution control method is adopted, some tanks with high pollution loads may have insufficient treatment capacity, while some tanks with low pollution loads may receive excessive treatment resources, leading to a decrease in the overall system efficiency.

[0129] Therefore, this embodiment determines the control priority based on the proportion of the sewage discharge load of each aquaculture tank to the total sewage discharge load of the system. The specific calculation is as follows:

[0130] P i =L sum / L i , Among them, P i L represents the control priority of the i-th water purification tank; sum Indicates the total system sewage load; L i This represents the sewage discharge load of the i-th bucket level.

[0131] When in a certain breeding tank, P i >P j P jThis represents the average control priority of all water-cooled aquaculture tanks, indicating that this particular tank contributes a higher proportion of pollution and therefore has a higher control priority than other tanks. Therefore, the edge control device needs to allocate resources according to control priority. Specific allocation operations include:

[0132] (1) Dynamic allocation of circulating water treatment capacity, prioritizing the increase of circulating treatment flow rate to aquaculture tanks with high pollution load. That is, increasing the frequency of water entering the solid-liquid separation and MBBR device in the tank, and reducing the residence time of pollutants in the tank.

[0133] (2) Implement equipment adjustment and resource allocation. For high-priority aquaculture tanks, prioritize increasing the flow intensity, oxygenation intensity, and disinfection time; for low-priority aquaculture tanks, maintain basic operating parameters.

[0134] (3) Dynamic matching of MBBR treatment capacity. When multiple high-priority water tanks experience an increase in pollution load simultaneously, the total system discharge load increases synchronously. The edge control device improves the MBBR unit's treatment capacity by increasing aeration, increasing carbon source dosage, and improving overall denitrification capacity.

[0135] Furthermore, to avoid frequent changes in control resources, this embodiment can also set a priority change lag mechanism. That is, the control level of a certain breeding tank is only increased when its control priority exceeds a set threshold for several consecutive cycles; when the control priority decreases, the control level is also reduced only after confirmation for several cycles.

[0136] By employing the above methods, differentiated control can be achieved among multiple water-cooled breeding tanks, allowing limited circulating water treatment capacity and equipment adjustment resources to be prioritized for breeding tanks under greater pollution pressure, thereby improving the overall system's breeding efficiency and operational stability.

[0137] 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, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A water purification system for adult Wuchang bream, characterized in that, include: Several breeding tanks are used for both the growth period and the water purification period. An edge control device is used to identify the operating condition of the breeding tank and stop feeding the breeding tank when it is in the water-cleaning and rearing condition; MBBR device; The edge control device performs tank-level control based on the tank-level sewage discharge load of each of the aquaculture tanks in the suspended water purification and maintenance condition, and adjusts the operating parameters of the MBBR device based on the total system sewage discharge load of the aquaculture tanks in the suspended water purification and maintenance condition.

2. The Wuchang bream adult rearing system according to claim 1, characterized in that, Also includes: The data acquisition device is used to collect water body operation parameters and fish activity status parameters of the aquaculture tank; The edge control device calculates the barrel-level sewage discharge load based on water body operating parameters and fish activity status parameters.

3. The Wuchang bream adult fish suspension and purification system according to claim 2, characterized in that: The fish activity parameters include at least one of the following: swimming speed, aggregation degree, spatial distribution uniformity, and swimming direction consistency.

4. The Wuchang bream adult rearing system according to claim 1, characterized in that, Also includes: An actuator is used to adjust the flow intensity, oxygenation intensity, and disinfection operation status of the aquaculture tank; The edge control device adjusts the flow intensity, oxygenation intensity, and disinfection operation status of each aquaculture tank in the water-cooling and purification operation state according to the tank-level sewage discharge load.

5. The Wuchang bream adult fish suspension and purification system according to claim 1, characterized in that: The MBBR device includes, An aeration regulating unit is used to regulate the dissolved oxygen levels in the aquaculture tank. A carbon source addition unit is used to supply organic carbon to the denitrifying bacteria in the breeding tank; The edge control device changes the fluidization state of the MBBR packing by adjusting the aeration intensity, and synchronously adjusts the aeration intensity and carbon source dosage according to the total sewage load of the system.

6. The Wuchang bream adult fish suspension and purification system according to claim 5, characterized in that: The edge control device establishes a temperature compensation model, determines the compensation coefficient of the MBBR device based on the circulating water temperature in the aquaculture tank and the total sewage load of the system, and adjusts the operating parameters of the aeration adjustment unit and the carbon source addition unit according to the compensation coefficient.

7. The Wuchang bream adult rearing system according to claim 1, characterized in that: The edge control device establishes a risk assessment model for suspended water purification, determines the risk level of the corresponding suspended water purification working condition based on the sewage discharge load of the tank and the activity status of the fish, and adjusts the operating status of the tank-level actuator according to the risk level.

8. The Wuchang bream adult water purification system according to claim 7, characterized in that: When the risk level reaches the preset level, the edge control device increases the circulating water exchange flow rate of the breeding tank in the water purification and maintenance state, and outputs alarm information.

9. A control method for a water purification system for adult Wuchang bream, characterized in that: The Wuchang bream adult rearing system according to any one of claims 1 to 8 includes the following steps: S1, Identify the current operating status of the breeding tank; S2, load the corresponding control parameters according to the operating conditions of the breeding tank, and turn off the feeding function when the breeding tank is identified as being in the water-cleaning and breeding condition; S3, collect the operating parameters of each of the breeding tanks under the suspended water purification and breeding condition, and calculate the sewage discharge load of the tank level; S4, adjust the operating status of the corresponding breeding tank according to the tank-level sewage discharge load; S5, summarizing the tank-level sewage discharge loads of several aquaculture tanks under the suspended water purification and aquaculture conditions to form the total sewage discharge load of the system, and adjusting the circulating water biological treatment capacity according to the total sewage discharge load of the system; S6. Determine the risk level based on the barrel-level sewage discharge load and the fish activity status, and implement corresponding control measures according to the risk level.

10. The control method for a water purification system for adult Wuchang bream according to claim 9, characterized in that: The edge control device determines the control priority of each aquaculture tank based on the proportion of the tank-level sewage discharge load to the total sewage discharge load of the system, and dynamically allocates the circulating water biochemical treatment capacity and the adjustment resources of the tank-level actuators according to the control priority.

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