Factory circulating water intelligent culture system and method for sturgeon fries

Abstract

The invention discloses a factory circulating water intelligent culture system and method for sturgeon fries. The factory circulating water intelligent culture system is characterized in that a culture tank is used for high-density culture of the sturgeon fries; the water treatment system is connected with the breeding tank through a pipeline to form a circulating water path; the automatic feeding system is arranged beside the breeding tank; the constant temperature and fresh air system is used for keeping the air temperature in the breeding workshop stable and conducting active ventilation; and an intelligent water quality monitoring and equipment control system. Wherein the water treatment system sequentially comprises a solid-liquid separation device, a reservoir, a carbon dioxide degassing device, an organic matter separation device, a biological filtration device, an oxygenation and decolorization device and a disinfection and sterilization device along the water flow direction. The system has the effects of high integration, efficient water treatment, all-around intelligent control, precise feeding management, energy conservation, system optimization design, high reliability, maintainability and the like.

Description

Technical Field

[0001] This invention relates to the field of aquaculture engineering and technology, and in particular to a factory-scale recirculating aquaculture system and method for sturgeon fry. Background Technology

[0002] Sturgeon fry rearing is a crucial link in the sturgeon farming industry, and its survival rate and growth quality directly affect the economic benefits of the entire farming process. Traditional farming methods are mostly flow-through or still-water farming, which have problems such as high water consumption, unstable water quality, significant impact from the external environment, high labor intensity, and large fluctuations in fry survival rates.

[0003] Recirculating aquaculture systems (RAS) are an effective way to solve the above problems. However, existing sturgeon fry farming systems often have the following shortcomings, such as: Inadequate water treatment processes: The system integration is low, and the matching of various water treatment units (such as solid-liquid separation, degassing, organic matter removal, biological filtration, oxygenation, and disinfection) is poor, making it difficult to form a stable and efficient water purification capacity, especially for the treatment of feces, ammonia nitrogen, carbon dioxide, etc. generated by high-density aquaculture.

[0004] Low level of intelligence: Most systems only have basic water quality monitoring functions and lack the ability to link and automatically adjust equipment based on real-time data (such as closed-loop control of pH and dissolved oxygen, automatic equipment rotation, intelligent alarm, etc.). They still require a lot of manual intervention and cannot achieve accurate and stable environmental control.

[0005] System design deficiencies: Inadequate design of aquaculture pond structure, water flow patterns, and energy utilization may lead to problems such as incomplete sewage discharge, water stratification, excessive energy consumption, and high equipment failure rates.

[0006] Environmental control is limited: it focuses on water temperature control and neglects the impact of air quality (such as fresh air exchange) in the workshop on the healthy growth of sturgeon fry.

[0007] Therefore, there is an urgent need for a sturgeon fry factory farming system that can achieve high-density aquaculture, intelligent water quality monitoring, efficient circulating water treatment, and comprehensive environmental control. Summary of the Invention

[0008] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a factory-scale recirculating aquaculture system and method for sturgeon fry farming. This system achieves high-density sturgeon fry farming while simultaneously enabling intelligent water quality monitoring, intelligent feeding, and efficient recirculating water treatment, thus achieving the goal of high-quality and high-efficiency sturgeon fry cultivation.

[0009] The above-mentioned technical problems of the present invention are mainly solved by the following technical solution: a sturgeon fry factory-scale recirculating aquaculture intelligent aquaculture system, characterized in that it includes: The breeding tank is used for high-density breeding of sturgeon fry; the water treatment system is connected to the breeding tank through pipes to form a circulating water circuit; the automatic feeding system is arranged next to the breeding tank; the constant temperature and fresh air system is used to maintain a stable air temperature in the breeding workshop and to actively exchange air.

[0010] In addition, an intelligent water quality monitoring and equipment control system; wherein, the water treatment system includes, in sequence along the water flow direction: a solid-liquid separation device, a water storage tank, a carbon dioxide degassing device, an organic matter separation device, a biological filtration device, an oxygenation and decolorization device, and a disinfection and sterilization device.

[0011] The intelligent water quality monitoring and equipment control system is implemented through a PLC cabinet, which monitors and automatically adjusts the water quality parameters and equipment operating status within the system.

[0012] In the aforementioned intelligent recirculating aquaculture system for sturgeon fry, the culture tank is further equipped with: a bottom drain outlet with perforated pipes; a side drain outlet with replaceable inserts to control the water level between 80% and 95% of the tank depth; and a water inlet that extends to the bottom of the tank with perforated pipes to ensure uniform flow velocity in the upper, middle, and lower layers of the water and avoid stagnant water zones.

[0013] In the aforementioned intelligent recirculating aquaculture system for sturgeon fry, the solid-liquid separation device is a rotary drum microfilter, which includes a stainless steel rotary drum, a rotary drum drive motor, a high-pressure backwash water pump, and a liquid level probe. When the liquid level reaches a certain height and triggers the liquid level probe, the rotary drum drive motor drives the stainless steel rotary drum to rotate, while the high-pressure backwash water pump washes the rotary drum.

[0014] In the aforementioned intelligent recirculating aquaculture system for sturgeon fry, the organic matter separation device is a freshwater-specific protein separator; and the biological filtration device is a barrel-type airlift biological filter filled with membrane-type MBBR packing material.

[0015] In the aforementioned intelligent recirculating aquaculture system for sturgeon fry, the oxygenation and decolorization device is further described as a low-head water-oxygen mixer with several air inlets for introducing pure oxygen and ozone, respectively, to achieve integrated oxygenation and decolorization. The water after oxygenation and decolorization basically meets the requirements for aquaculture water.

[0016] In the aforementioned intelligent recirculating aquaculture system for sturgeon fry, the automatic feeding system further includes an intelligent automatic feeder, a local control box, and a remote control platform; each of the breeding tanks is equipped with one intelligent automatic feeder, with its discharge port located at the edge of the breeding tank; the intelligent automatic feeder can independently set the feed feeding speed, feeding time, and feeding amount for each device through the local control box or the remote control platform.

[0017] In the aforementioned intelligent recirculating aquaculture system for sturgeon fry, the temperature control and fresh air system further includes: The fresh air system consists of several unidirectional flow fresh air units, with half responsible for air intake and the other half responsible for air exhaust. The air exchange rate has multiple adjustable levels.

[0018] The constant temperature system includes an air source heat pump, a constant temperature water tank, a circulating pump, heat exchange tubes arranged in a water storage tank, a temperature probe, and a control cabinet. The temperature probe monitors the system water temperature in real time. When the water temperature deviates from the set value by more than 0.5℃, it controls the circulating pump to start, pumping the water in the constant temperature water tank into the heat exchange tubes for heat exchange.

[0019] In the aforementioned intelligent recirculating aquaculture system for sturgeon fry, the intelligent water quality monitoring and equipment control system is further configured to perform the following functions.

[0020] Equipment timed switching: Record the operating time of the maintenance equipment with one active and one standby, and automatically switch to the standby equipment after the set time is reached.

[0021] Automatic water level control and daily automatic water change: The water level sensor located at the lowest point of the system automatically controls the opening and closing of the water supply valve to maintain the water level. Based on the set water change time and water change volume, the water supply valve and the drainage valve are controlled simultaneously to complete the automatic water change.

[0022] pH adjustment: The pH value is monitored by a pH probe, and the system pH is maintained near the set value by gradually adjusting the speed of the peristaltic pump that adds alkali solution to the water storage tank.

[0023] Dissolved oxygen regulation: The dissolved oxygen content is monitored by a dissolved oxygen probe placed after the oxygenation and decolorization device, and the dissolved oxygen content is maintained within a set range by adjusting the opening of the proportional valve of the pure oxygen pipeline.

[0024] In the aforementioned intelligent recirculating aquaculture system for sturgeon fry, the intelligent water quality monitoring and equipment control system is further configured to execute intelligent alarms. The logic is as follows: when the parameters are abnormal, an alarm preparation phase is initiated. During a freely settable time T (0 < T ≤ 600 seconds), the system continuously samples the data at a frequency of once per second. If the data remains abnormal during this time, a final alarm is triggered. The alarms include local audible and visual alarms and remote telephone alarms.

[0025] In the aforementioned intelligent recirculating aquaculture system for sturgeon fry, the key parameters in the system water are further stabilized within the following ranges: dissolved oxygen 8-10 mg / L, pH 7.0-7.2, temperature 16-20℃, and daily water exchange rate of 5%.

[0026] Compared with the prior art, the present invention has the following significant advantages: 1. Highly integrated and efficient water treatment: By optimizing the configuration of water treatment units such as solid-liquid separation, degassing, protein separation, biological filtration, oxygenation and decolorization, and sterilization, a highly efficient and stable circulating water treatment chain is formed. It is specifically designed for the physiological needs and water quality characteristics of sturgeon fry farming, laying a solid foundation for achieving high-density farming.

[0027] 2. Comprehensive intelligent control: Through the PLC-based intelligent control system, closed-loop automatic adjustment of key water quality parameters (pH, dissolved oxygen, water level, temperature), timed switching and start-up / shutdown of equipment, and intelligent alarm with multiple confirmation mechanisms are realized, which greatly reduces manual intervention and ensures the stability and reliability of system operation.

[0028] 3. Precision feeding management: Each breeding tank is equipped with an independent automatic feeder, which can be controlled locally and remotely. It can accurately and quantitatively feed according to different growth stages and specific conditions of different breeding tanks, thereby improving feed utilization and promoting uniform growth of seedlings.

[0029] 4. Energy Saving and System Optimization Design: The water system adopts a "single-stage water lifting and gravity flow" design, which significantly reduces system energy consumption and equipment failure points. The coordinated operation of the constant temperature system and the fresh air system not only controls the water temperature but also ensures fresh and stable air quality in the workshop, creating a comprehensive and excellent growth environment for sturgeon fry.

[0030] 5. High reliability and maintainability: Key equipment is configured with one active and one standby and has an automatic switching function. The intelligent alarm system can promptly notify personnel at different levels, ensuring a rapid response in the event of an anomaly. The overall reliability and maintainability of the system are extremely high. Attached Figure Description

[0031] Figure 1This is a process flow diagram of the present invention.

[0032] Figure 2 This is a flow chart of a constant temperature process according to the present invention. Detailed Implementation

[0033] The technical solution of the present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0034] See Figure 1 The process flow diagram illustrates a sturgeon fry factory-scale recirculating aquaculture intelligent system, comprising: a rearing tank for high-density rearing of sturgeon fry; a water treatment system connected to the rearing tank via pipes to form a recirculating water path; an automatic feeding system located beside the rearing tank; a constant temperature and fresh air system for maintaining stable air temperature and active ventilation within the rearing workshop; and an intelligent water quality monitoring and equipment control system. The water treatment system, along the water flow direction, includes, in sequence: a solid-liquid separation device, a water storage tank, a carbon dioxide degassing device, an organic matter separation device, a biological filtration device, an oxygenation and decolorization device, and a disinfection and sterilization device. The intelligent water quality monitoring and equipment control system is implemented via a PLC cabinet, monitoring and automatically adjusting water quality parameters and equipment operating status within the system.

[0035] Specifically, the aquarium is made of fiberglass, with a diameter of 2m and a height of 1m. It is equipped with two drain outlets: a bottom drain outlet and a side drain outlet. The bottom drain outlet has a perforated pipe to prevent fish fry from escaping and to allow for the discharge of feces and waste. The side drain outlet has a replaceable pipe for controlling the water level, allowing it to fluctuate between 80% and 95% of the aquarium's depth, i.e., between 0.8 and 0.95m. A single water inlet is provided, with a perforated pipe extending to the bottom of the aquarium to ensure uniform water flow across the upper, middle, and lower layers.

[0036] After being discharged from the aquaculture tank, the wastewater passes through a solid-liquid separation system to remove solid particles larger than or equal to 0.075 mm before flowing into a storage tank. The solid-liquid separation device is a rotary drum microfilter with a processing capacity of 150 m³ / h. It includes a stainless steel drum, a drum drive motor, a high-pressure backwash pump, and a level probe. When the liquid level reaches a certain height and triggers the level probe, the drum drive motor drives the stainless steel drum to rotate, while the high-pressure backwash pump flushes the drum with a backwash pressure ≥0.65 MPa.

[0037] This embodiment includes a pH adjustment device: located beside the water storage tank, comprising an alkali tank, a stirrer, and a peristaltic pump. The stirrer is located inside the alkali tank, which contains a high-concentration alkaline liquid. The peristaltic pump draws the alkali liquid into the water storage tank to prevent the pH in the system from becoming too low.

[0038] The tailwater in the reservoir is drawn by the main circulation pump and divided into three water paths, which enter the carbon dioxide degassing device, the organic matter separation device, and the biological filtration device respectively.

[0039] The carbon dioxide degassing device includes a water distribution tank and degassing packing. After the tailwater is pumped into the carbon dioxide degassing device, it is dispersed into small streams through the perforated water distribution tank, and then dispersed by the degassing packing to remove carbon dioxide. After degassing, the water flows back to the storage tank.

[0040] The organic matter separation device is a freshwater-specific protein separator. After the effluent is fed into the protein separator to remove small and soluble organic matter, it is returned to the water storage tank.

[0041] The biological filtration unit is a barrel-type air-lift biological filter filled with membrane-type MBBR packing material, with a specific surface area of ​​5500 m² / m³, a filling rate of 50%, and an ammonia nitrogen removal capacity of 1.1 kg / m³·day. After the effluent passes through the biological filtration unit to remove dissolved ammonia nitrogen and nitrite and other harmful substances, it flows into the oxygenation and decolorization unit.

[0042] The oxygenation and decolorization device uses a low-head oxygen-water mixer (LHO), with an oxygen and ozone utilization rate of over 85%. Since it eliminates the need for water or air pumps for pressurization, it consumes no energy. It has two air inlets, one for pure oxygen and one for ozone, integrating oxygenation and decolorization. Pure oxygen is used to oxygenate the water, while ozone is used for decolorization. After oxygenation and decolorization, the water basically meets the requirements for aquaculture water and then flows into the ultraviolet sterilization device.

[0043] Ultraviolet sterilization device: A pipeline ultraviolet sterilization lamp with a power of 1.5 kW is selected. The water flows through the ultraviolet sterilization lamp for sterilization and then flows back into the aquaculture tank.

[0044] Furthermore, the automatic feeding system includes an intelligent automatic feeder, a local control box, and a remote control platform. The intelligent automatic feeder includes a feed hopper, a drive motor, and a feeding auger conveyor. Each aquaculture tank is equipped with one intelligent automatic feeder, with its discharge port positioned at the edge of the tank to prevent feed from being quickly carried away by the water flow. The feeding speed, feeding time, and feeding amount of each intelligent automatic feeder can be independently set via the local control box or the remote control platform to meet the needs of different aquaculture tanks and different growth stages of fish fry.

[0045] Furthermore, the constant temperature and fresh air system in this embodiment includes: The fresh air system consists of four unidirectional flow fresh air units: two for air intake and two for air exhaust. The ductwork is strategically arranged to ensure a stable airflow throughout the workshop. The maximum air volume is 3000 m³ / hour, guaranteeing one air exchange per hour. The air exchange rate is adjustable in five levels: 0%, 25%, 50%, 75%, and 100%. The air exchange rate can be adjusted according to different needs; for example, it can be reduced in winter and summer to minimize heat exchange between the workshop and the outside environment, while increased in spring and autumn to ensure fresh air.

[0046] The constant temperature system includes an air source heat pump, a constant temperature water tank, a circulating pump, heat exchange tubes arranged in the water storage tank, temperature probes, and a control cabinet. For example... Figure 2 As shown, the heat exchange unit is placed outside the workshop. A circulating pump heats or cools the water in the constant-temperature water tank to maintain a constant water temperature. Temperature probes are installed in the water treatment system to monitor the system water temperature in real time. When the water temperature deviates from the set value by more than 0.5℃, the circulating pump is activated to pump water from the constant-temperature water tank into the heat exchange tubes for heat exchange. The heat exchange tubes are located in the water storage tank, achieving constant water temperature through heat exchange.

[0047] There are a total of 4 circulation pumps: 2 primary circulation pumps and 2 secondary circulation pumps. The primary circulation pumps are used to circulate the constant temperature water in the heat exchange unit and the constant temperature water tank, with one pump in operation and one on standby; the secondary circulation pumps are used to circulate the heat exchange water in the constant temperature water tank and the heat exchange tubes, with one pump in operation and one on standby.

[0048] The control cabinet is used to control the entire constant temperature system. It allows you to select heating / cooling modes, set the water temperature in the constant temperature water tank, and set the constant temperature required by the system.

[0049] Furthermore, in this embodiment, the intelligent water quality monitoring and equipment control system is implemented through a PLC cabinet. The water quality detection device monitors various water environment parameters in the system in real time and feeds them back to the intelligent control cabinet. The equipment control system adjusts relevant equipment in real time based on the feedback parameters and set parameters to maintain system parameter stability. The system is configured to perform the following functions: A. Timed Equipment Switching: The system records the operating time of one active and one standby maintenance device. After the set time is reached, the system automatically switches to the standby device. Important maintenance equipment in this circulating water system, such as microfilters, circulating pumps, and blowers, are all operated with one active and one standby device. The two devices need to be switched on a timed basis. Operators can set the switching time for specific equipment on the intelligent control cabinet. The control cabinet records the operating time of the corresponding equipment in real time. After the set time is reached, it automatically switches to the standby device and restarts recording the operating time, repeating this process.

[0050] B. Automatic Water Level Control and Daily Automatic Water Change: A water level sensor located at the lowest point in the system automatically controls the opening and closing of the water supply valve to maintain the water level. Based on the set water change time and volume, both the water supply and drainage valves are controlled simultaneously to complete the automatic water change. Due to factors such as evaporation in the circulating water system, the total water volume gradually decreases. The system water is recycled through pumping and gravity flow. Therefore, there is a lowest water level point. A water level sensor is placed at this point. As water flows away, the liquid level at the lowest point gradually decreases to the set lower limit. The control cabinet automatically controls the water supply valve to open, replenishing the system with external fresh water. The process automatically stops when the liquid level reaches the set upper limit, and repeats this cycle.

[0051] The system uses automatic water replacement to ensure a certain daily water exchange volume and maintain water quality. The control cabinet automatically executes the water replacement according to the set water replacement time and volume. During water replacement, the control cabinet simultaneously opens the water supply valve and the water drain valve to maintain the system's water balance. Once the required water replacement volume is reached, the water supply valve and the water drain valve automatically close.

[0052] pH Adjustment: The pH value is monitored by a pH probe, and the system pH is maintained near the set value by gradually adjusting the speed of the peristaltic pump that adds alkali solution to the storage tank. Because the biological filtration unit constantly consumes alkalinity in the system, the pH continuously drops. The peristaltic pump operates 24 hours a day, adding alkali solution to the system to raise the pH value. The pH probe is placed in the water treatment area to continuously monitor the system pH value. The desired pH value is set in the intelligent control cabinet. When the system pH value gradually falls below the set value, the control cabinet gradually increases the peristaltic pump speed to maintain the required pH value. When the pH value gradually rises, the control cabinet gradually decreases the peristaltic pump speed to reduce the amount of alkali solution added, ultimately maintaining the pH value within ±0.5 of the set value to ensure the maximum efficiency of the biological filtration unit.

[0053] Dissolved oxygen regulation: The dissolved oxygen content is monitored by a dissolved oxygen probe installed after the oxygenation and decolorization device. The dissolved oxygen content is maintained within a set range by adjusting the opening of the proportional valve in the pure oxygen pipeline. Pure oxygen is introduced into the oxygenation and decolorization device through pipelines to increase the dissolved oxygen level in the water. Sturgeon fry have different oxygen consumption levels at different growth stages. Too low a dissolved oxygen level cannot meet the growth needs of the sturgeon fry, while too high a dissolved oxygen level will result in a waste of pure oxygen. The dissolved oxygen probe, installed after the oxygenation and decolorization device, monitors the dissolved oxygen content in the water in real time after oxygenation. If the dissolved oxygen level is too low, the control cabinet will increase the opening of the proportional valve in the pure oxygen pipeline to increase the pure oxygen supply; if the dissolved oxygen level is too high, the proportional valve opening will decrease to reduce the pure oxygen supply, thus maintaining the dissolved oxygen level within a suitable range.

[0054] Equipment timing: Some equipment (such as ozone generators) does not need to be turned on all day. The control cabinet can be set with the corresponding equipment start-up time and duration to achieve the goal of automatic equipment start-up and shutdown.

[0055] The intelligent control cabinet implements intelligent alarms, monitoring all water quality parameters and equipment operation status in real time. When parameters and operating conditions change, they are compared with set alarm values. If the alarm value requirements are not met, the control cabinet enters the alarm preparation phase. This process is repeated multiple times. If the parameters consistently fail to meet the alarm value requirements within a certain timeframe, the intelligent control cabinet triggers an alarm. The logic is as follows: When parameters are abnormal, the alarm preparation phase begins. Within a freely configurable time T (0 < T ≤ 600 seconds), data is continuously sampled at a frequency of once per second. If the data remains abnormal throughout this time, the final alarm is triggered.

[0056] Alarms include local audible and visual alarms, which use a loudspeaker to flash and sound alarms to notify on-duty personnel to handle the situation promptly; and remote telephone alarms, which notify technical personnel and responsible leaders by telephone to ensure that personnel at all levels receive the alarm and provide appropriate support when on-duty personnel are unable to handle the situation.

[0057] Furthermore, this embodiment provides a method for raising sturgeon fry using this system, including stabilizing key parameters in the system water within the following ranges: dissolved oxygen 8-10 mg / L, pH 7.0-7.2, temperature 16-20℃, and a daily water exchange rate of 5%, with the water exchange rate to be manually increased as needed.

[0058] Before applying this system, system debugging and parameter settings should be performed. Using the PLC control cabinet of the intelligent water quality monitoring and equipment control system, the core operating parameters of the system should be set as follows: maintain the water temperature at 16-20℃, the pH value at 7.0-7.2, and the dissolved oxygen at 8-10 mg / L. Set the daily automatic water exchange rate to 5%. Set automatic switching cycles (e.g., 24 hours) for key equipment (such as microfilters and circulating pumps). Configure closed-loop control logic for pH and dissolved oxygen regulation, and set alarm parameters and alarm confirmation time T (e.g., 120 seconds).

[0059] After the system is officially operational, the wastewater from the aquaculture tanks is discharged from the bottom and side channels. After being filtered by a microfiltration machine to remove large solid particles, it enters the storage tank. The main circulation pump draws water from the storage tank and divides it into three separate channels for deaeration, protein separation, and biological filtration units. The treated water is then combined and oxygenated and decolorized by a low-head oxygen-water mixer (LHO), followed by ultraviolet sterilization. Finally, the clean, oxygen-rich water is returned to the aquaculture tanks. Simultaneously, the automatic feeding system provides precise feeding according to a set plan; the constant temperature and fresh air system ensures stable water and air temperatures and fresh air; and the intelligent control system monitors all aspects in real time, automatically adjusting equipment operation and notifying management personnel via audible and visual alarms and multi-level telephone alarms in case of abnormalities. The entire system works collaboratively to achieve efficient, high-quality, and high-density factory farming of sturgeon fry.

[0060] The above embodiments are illustrative of the present invention and not intended to limit the invention. The described embodiments are merely some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art inspired by the present invention without creative effort are within the scope of protection of the present invention.

Claims

1. A sturgeon fry factory circulating water intelligent breeding system, characterized in that, The application relates to a high-density sturgeon breeding system. The system comprises a breeding tank for high-density breeding of sturgeon fry, a water treatment system connected with the breeding tank through pipelines to form a circulating water path, an automatic feeding system arranged at the side of the breeding tank, a constant-temperature and fresh air system for maintaining the air temperature in the breeding workshop stable and actively ventilating, and an intelligent water quality monitoring and equipment control system. The water treatment system comprises, in sequence along the water flow direction, a solid-liquid separation device, a water storage pool, a carbon dioxide degassing device, an organic matter separation device, a biological filtration device, an oxygenation and decolorization device and a disinfection and sterilization device. The intelligent water quality monitoring and equipment control system is realized through a PLC cabinet and monitors and automatically adjusts the water quality parameters and the equipment operation state in the system. The breeding tank is provided with a bottom water outlet provided with a perforated pipe, a side groove water outlet provided with replaceable insertion pipes for controlling the water level to change between 80% and 95% of the depth of the breeding tank, and a water inlet extended to the bottom of the breeding tank by using a perforated pipe.

2. The intelligent system for the industrial circulation water of the sturgeon fry according to claim 1, characterized in that, The solid-liquid separation device is a drum-type microfilter comprising a stainless steel drum, a drum driving motor, a high-pressure backflushing water pump and a liquid level probe.

3. The intelligent system for factory cycling water of sturgeon fry according to claim 1, characterized in that, The organic matter separation device is a freshwater special protein separator, and the biological filtration device is a bucket-type air-lift biological filter filled with membrane-type MBBR fillers.

4. The sturgeon fry factory circulating water intelligent breeding system according to claim 1, characterized in that, The oxygenation and decolorization device is a low-water-head water-oxygen mixing device provided with a plurality of air inlets for introducing pure oxygen and ozone to realize the integration of oxygenation and decolorization.

5. The intelligent system for factory cycling water of sturgeon fry according to claim 1, characterized in that, The automatic feeding system comprises intelligent automatic feeders, local control boxes and a remote control platform.

6. The intelligent system for factory cycling water of sturgeon fry according to claim 1, characterized in that, The constant-temperature and fresh air system comprises:

7. The intelligent system for factory cycling water of sturgeon fry according to claim 1, characterized in that, a fresh air system composed of a plurality of one-way flow fresh air machines, half of which are responsible for air intake and the other half of which are responsible for air outlet, and the air exchange volume has a multi-grade adjustment function; a constant-temperature system comprising an air source heat pump, a constant-temperature water tank, a circulating pump, heat exchange pipes arranged in the water storage pool, a temperature probe and a control cabinet. The intelligent water quality monitoring and equipment control system is configured to perform the following functions:

8. The intelligent system for factory cycling water of sturgeon fry according to claim 1, characterized in that, equipment timing switching: recording the opening time of a standby maintenance device, and automatically switching the standby device when the set time is reached; automatic water level control and daily automatic water change: automatically controlling the opening and closing of a water supplement valve to maintain the water level through a water level sensor arranged at the lowest point of the system, and simultaneously controlling the water supplement valve and a drainage valve to complete automatic water change according to the set water change time and water change amount; ​ pH adjustment: the pH value is monitored by a pH probe, and the pH of the system is maintained near the set value by adjusting the speed of the peristaltic pump adding alkali to the reservoir step by step; Dissolved oxygen adjustment: the dissolved oxygen content is monitored by a dissolved oxygen probe arranged after the oxygenation and decolorization device, and the dissolved oxygen content is maintained in the set interval by adjusting the opening of the proportional valve of the pure oxygen pipeline.

9. The sturgeon fry factory circulating water intelligent breeding system according to claim 8, characterized in that, The intelligent water quality monitoring and equipment control system is also configured to perform intelligent alarm, the logic of which is: when the parameters are abnormal, enter the alarm preparation stage, continuously sample at a frequency of once per second within the freely set time T (0 < T ≤ 600 seconds), if the data are always abnormal within the time, trigger the final alarm; the alarm includes local audible and light alarms and remote telephone alarms.

10. A method for rearing sturgeon fry using the system according to any one of claims 1 to 9, characterized in that, The system includes stable control of key parameters in the water body to the following ranges: dissolved oxygen 8-10 mg / L, pH value 7.0-7.2, temperature 16-20℃, and daily water exchange rate 5%.

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