A tail water recycling treatment system and method for aquaculture in saline-alkali land

Abstract

The invention discloses a saline-alkali land aquaculture tailwater recycling treatment system and method, belonging to the technical field of aquaculture wastewater treatment; the invention comprises a breeding field, a water flow trough and a tailwater complex supervision center, and an inlet channel and an outlet channel are arranged between the breeding field and the water flow trough for communication; the invention collects tailwater salinity, nitrogen and phosphorus content and ecological indicators in real time through a multi-parameter water quality monitoring buoy and an ecological monitoring benchmark, accurately identifies water quality anomalies based on a conductivity conversion model and over-standard rate analysis, generates control signals to control freshwater dilution pumps, electric valves and other equipment in a linkage manner, and achieves dynamic compliance of salinity and nitrogen and phosphorus concentrations; constructs a closed ecological chain of plant absorption, biological purification and residence time optimization, and automatically adjusts the water flow path, supplements the biological density or prolongs the residence time by quantifying the plant nitrogen and phosphorus absorption and the filter-feeding biological purification capacity, to ensure efficient removal of pollutants, and the tailwater is recycled after purification.

Description

Technical Field

[0001] The present invention relates to the technical field of aquaculture sewage treatment, and specifically provides a system and method for recycling and treating the tail water of aquaculture in saline-alkali land. Background Art

[0002] As an important reserve cultivated land resource, the development and utilization of saline-alkali land is of great significance for alleviating the shortage of land resources. However, its characteristics such as high salinity, high pH value, and ion imbalance significantly restrict aquaculture, especially facing severe challenges in the field of tail water treatment. Traditional aquaculture tail water treatment technologies are mainly designed based on freshwater environments. When applied in saline-alkali areas, the tail water of aquaculture in saline-alkali land has characteristics such as high salinity, high alkalinity, and excessive nitrogen and phosphorus content.

[0003] Traditional tail water treatment systems have problems such as poor adaptability to saline-alkali environments, lagging parameter monitoring, and inaccurate regulation. Existing technologies mostly focus on single physical or chemical treatment, lacking real-time monitoring, adjustment, and treatment of saline-alkali land tail water, and it is difficult to achieve efficient recycling of tail water. Therefore, constructing a soft communication system integrating intelligent parameter analysis and dynamic regulation is crucial for improving the efficiency of recycling and treating the tail water of aquaculture in saline-alkali land.

[0004] It should be noted in combination with the above content that the Chinese patent with the application number CN2023110252968 discloses a farmland drainage purification system, which uses a treatment channel with a primary sedimentation section, an ecological treatment section, and an ecological storage pond to ecologically treat and purify farmland drainage, reduce the pollutants in the farmland drainage, and reduce the pollution of the farmland drainage.

[0005] However, in actual use and when applied to aquaculture areas in saline-alkali land, unidirectional purification of tail water greatly causes waste of tail water and additional chemical treatment costs for substances such as nitrogen and phosphorus rich in the tail water, lacking precise detection, analysis, regulation, and reuse of the tail water.

[0006] In view of the above technical defects, a solution is now proposed. Summary of the Invention

[0007] The purpose of the present invention is to provide a system and method for recycling and treating the tail water of aquaculture in saline-alkali land to solve the problems raised.

[0008] To achieve the above purpose, the present invention provides the following technical solution: A system for recycling and treating the tail water of aquaculture in saline-alkali land includes a breeding field, a flowing water tank, and a tail water complex supervision center. An inlet channel and an outlet channel are provided between the breeding field and the flowing water tank for connection. Inside the flowing water tank, there are a deep water area and a slow water area. A waterwheel type aerator is arranged at the top of the deep water area. A partitioned filter dam is arranged between the slow water area and the deep water area. A number of multi-parameter water quality monitoring buoys and a number of ecological monitoring poles are arranged inside the breeding field and the flowing water tank.

[0009] The communication connection of the tail water complex supervision center includes a comprehensive parameter acquisition module, a water parameter analyzer, an ecological parameter analyzer, and a regulation and decision-making module; the comprehensive parameter acquisition module collects the total water parameters and planting cycle parameters in the aquaculture field and the flow-through tank in real time according to the period, and sends them to the water parameter analyzer and the ecological parameter analyzer respectively;

[0010] The water parameter analyzer is used to calibrate and group the data recorded in real time in the total water parameters according to the acquisition time period, analyze the salinity S, total nitrogen TN, and total phosphorus TP to generate a single-number salt regulation signal and a multi-level signal, and send them to the regulation and decision-making module to adjust the tail number processing process;

[0011] The ecological parameter analyzer is used to analyze the nitrogen and phosphorus absorption amounts of salt-tolerant plants, the tail water residence time, and the absorption amounts of filter-feeding organisms in the planting cycle parameters, and send the generated nitrogen and phosphorus regulation signals, delay signals, and biological regulation signals to the regulation and decision-making module to regulate and process the tail water according to the analysis results.

[0012] Further, the process of analyzing the received total water parameters by the water parameter analyzer within the period is as follows:

[0013] The total water parameters consist of the pH value, salinity S, total nitrogen TN, and total phosphorus TP in the tail water. Data is collected every 15 minutes to construct an acquisition period, and the time sequence mark of each acquisition period is used as the group number F1, F2, F3,..., Fn, where n is a natural number greater than zero;

[0014] The salinity within a single group number is processed formulaically according to the linear regression model, which converts the salinity based on the conductivity method. The specific formula is: S = a×EC + b, where EC is the conductivity μS / CM, and a and B are the experimental ratio analysis coefficients. By measuring the conductivity of the water body and substituting it into the formula to calculate the salinity, it is judged whether it exceeds the aquaculture tolerance range, and the pre-stored salt percentage threshold is retrieved from the inside of the tail water complex supervision center. If the salinity > the salt percentage threshold, it is judged that the salinity needs to be regulated within this acquisition period, and a targeted single-number salt regulation signal is generated according to the difference salt difference between the salinity and the salt percentage threshold.

[0015] Further, the process of analyzing the nitrogen and phosphorus over-standard content based on the total water parameters is as follows:

[0016] Retrieve the total nitrogen TN and total phosphorus TP within a single group number, and construct a nitrogen and phosphorus over-standard rate formula according to the ratio calculation of mathematical multiplication and division: , , retrieve the aquaculture tail water discharge standard values, TN exceeding standard rate, and TP exceeding standard rate from the tail water complex supervision center for comparison and analysis. If the TN exceeding standard rate > standard value and the TP exceeding standard rate < standard value, generate a level 1 signal; if the TN exceeding standard rate < standard value and the TP exceeding standard rate > standard value, generate a level 2 signal; if the TN exceeding standard rate > standard value and the TP exceeding standard rate > standard value, generate a level 3 signal. Send the generated signal to the regulation decision-making module.

[0017] Furthermore, the process of the ecological parameter analyzer analyzing the received planting cycle parameters within the cycle is as follows:

[0018] Collect the growth indexes of salt-tolerant plants in the aquaculture field, namely plant height H, coverage rate C, and filter-feeding organism density M, through the ecological monitoring benchmark. Store them in the corresponding groups according to the collection time, and calculate the nitrogen and phosphorus absorption amounts of the salt-tolerant plants: , , where k1 and k2 represent the experimentally determined nitrogen and phosphorus absorption coefficients of the salt-tolerant plants. k1 can take a value of 0.05 mg / cm2·d / TN, and k2 can take a value of 0.01 mg / cm2·d / TP.

[0019] Furthermore, after obtaining the TN absorption amount and TP absorption amount, retrieve the tail water residence time formula from the tail water complex supervision center: , where t represents the optimized ecological purification efficiency. The optimized ecological purification efficiency refers to adjusting the tail water residence time or other water body parameters to make the removal effect of pollutants in the tail water by the ecological system reach the best state. The ecological system includes plants, microorganisms, and filter-feeding organisms. Pollutants in the tail water include nitrogen and phosphorus. V represents the experimentally measured value of the water body volume in the collection area, and Q represents the tail water detection flow value.

[0020] Furthermore, multiply the TN 实测 and TP 实测 collected during this time by Q and t respectively to obtain the nitrogen load value and phosphorus load value. Mark the comprehensive result of the nitrogen load value and phosphorus load value as the tail water nitrogen and phosphorus load. Retrieve the plant absorption amount stored in the conventional test from the tail water complex supervision center and compare it with the tail water nitrogen and phosphorus load. If the plant absorption amount > tail water nitrogen and phosphorus load, the purification ability meets the standard; if the plant absorption amount < tail water nitrogen and phosphorus load, it indicates insufficient plant purification. Generate a nitrogen and phosphorus regulation signal and send it to the regulation decision-making module;

[0021] Retrieve the preset tail water residence time from the tail water complex supervision center and compare it with t. If t ≥ preset tail water residence time, the purification requirement is met; if t ≤ preset tail water residence time, the purification requirement is not met. Generate a delay signal and send the delay signal to the regulation decision-making module.

[0022] Further, the density of filter-feeding organisms M is counted by underwater cameras, combined with the von Bertalanffy growth model of fish to predict the nitrogen and phosphorus absorption capacity, and the pre-stored predicted absorption range is retrieved from the tailwater complex supervision center. According to the product formula: filter-feeding organism absorption = M × single fish daily absorption, the predicted absorption range is compared with the filter-feeding organism absorption. If the filter-feeding organism absorption is within the predicted absorption range, it means that the tailwater biological purification in this area is qualified. If the filter-feeding organism absorption is less than the predicted absorption range, it means that the tailwater biological purification in this area is unqualified. The single fish daily absorption is the nitrogen and phosphorus content absorbed by each fish in the experimental data.

[0023] The plant absorption amount is obtained and the absorption amount of the filter-feeding organisms that fail the purification is summed to obtain the total absorption amount. If the total absorption amount is ≥ the tail water nitrogen and phosphorus load, it means that the overall tail water purification meets the standard. If the total absorption amount is ≤ the tail water nitrogen and phosphorus load, it means that the overall tail water purification is abnormal, and a biological control signal is generated and sent to the control decision module.

[0024] A working method of a saline-alkali land aquaculture tail water circulation treatment system comprises the following steps:

[0025] Water quality testing: Real-time data monitoring and collection of tailwater from aquaculture fields and water troughs through multi-parameter water quality monitoring buoys and ecological monitoring poles;

[0026] Data processing: By analyzing the total water parameters and plant cycle parameters of the collected data, the salinity, nitrogen and phosphorus exceeding standard rate, plant purification efficiency and filter feeding biological absorption efficiency are calculated through formulas;

[0027] Control and relief: According to the analysis results, the electric valve, fresh water dilution pump and waterwheel aerator are controlled in a linked manner to achieve dynamic control of tailwater salinity and nitrogen and phosphorus concentrations;

[0028] Data display: The tailwater complex supervision center displays abnormal data areas through a graphical interface to assist manual intervention.

[0029] The beneficial effects of the present invention are:

[0030] 1. The present invention realizes real-time dynamic monitoring of aquaculture tail water in saline-alkali land through multi-parameter water quality monitoring buoys and ecological monitoring benchmarks. Based on the conductivity method and nitrogen and phosphorus exceedance rate model, it can accurately identify salinity anomalies and nitrogen and phosphorus pollution levels. By grouping the collected data by time period, combining linear regression analysis and threshold comparison, targeted control signals are generated to realize intelligent linkage control of freshwater dilution pumps, electric valves and other equipment, ensuring that the tail water salinity and nitrogen and phosphorus concentrations quickly meet the standards, solving the problems of lagging parameter monitoring and inaccurate control in traditional systems.

[0031] 2. The present invention constructs a closed ecological cycle by integrating plant absorption, purification by filter-feeding organisms, and optimization of the tail water residence time. The formula for the nitrogen and phosphorus absorption of salt-tolerant plants and the prediction model for the absorption of filter-feeding organisms act synergistically to quantitatively evaluate the purification ability of the ecosystem. When the plant absorption is insufficient or the tail water residence time is too short, the system automatically adjusts the water flow path, extends the residence time, or supplements the biological density to achieve efficient removal of pollutants. In addition, the purified tail water is recycled, reducing water resource waste and chemical agent use, which conforms to the concept of green aquaculture.

[0032] 3. The present invention realizes the full-process control of the aquaculture field and the flow-through tank, constructs a display reminder by combining the generated signals to assist manual intervention, supports multi-dimensional data overlay analysis, improves the reliability of data verification. Through the dynamic regulation strategy, the system can adapt to seasonal changes and fluctuations in aquaculture load, ensuring long-term stable operation, and providing an economical and efficient tail water treatment solution for saline-alkali land aquaculture. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0034] Figure 1 It is a schematic flow chart of the method of the present invention;

[0035] Figure 2 It is a schematic structural diagram of the system flow of the present invention;

[0036] Figure 3 It is a schematic structural diagram of the aquaculture field and the flow-through tank of the present invention.

[0037] Reference numerals: 1, aquaculture field; 2, flow-through tank; 3, slow water area; 4, filter dam; 5, deep water area; 6, waterwheel aerator. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0039] Example 1: Please refer to Figure 1 - Figure 3As shown in the figure, this embodiment is a saline-alkali land aquaculture tail water circulation treatment system and method, including an aquaculture field 1, a flowing water tank 2 and a tail water complex supervision center. An intake channel and an outlet channel are provided between the aquaculture field 1 and the flowing water tank 2 for connection. Inside the flowing water tank 2, there are a deep water area 5 and a slow water area 3. A waterwheel aerator 6 is arranged at the top of the deep water area 5. A partitioned filter dam 4 is arranged between the slow water area 3 and the deep water area 5. A slag discharge port is arranged on the side of the filter dam 4 away from the aquaculture field 1.

[0040] Multiple groups of fresh water suction pumps are arranged on the same side of the waterwheel aerator 6 near the slag discharge port. The waterwheel aerator 6 is linked with salinity monitoring. When S > 5%, the aeration volume is increased to promote the photosynthesis of salt-tolerant plants and improve the nitrogen and phosphorus absorption efficiency. Inside the aquaculture field 1 and the flowing water tank 2, there are several multi-parameter water quality monitoring buoys and several ecological monitoring poles that are communicatively connected to the tail water complex supervision center. Electric valves, such as DN200 electric regulating valves, are installed inside the intake channel and the outlet channel, but are not limited to this. Inside the multi-parameter water quality monitoring buoy, there are various sensors such as a pH sensor, a salinity sensor, an online ammonia nitrogen sensor, and a total nitrogen and total phosphorus sensor, which are specifically selected according to actual needs and are not limited to this. Inside the ecological monitoring pole, there are a water temperature sensor, a water depth float, and an underwater camera, etc., which are specifically selected according to actual needs and are not limited to this;

[0041] The tail water complex supervision center is communicatively connected with a comprehensive parameter acquisition module, a water parameter analyzer, an ecological parameter analyzer, and a regulation decision module; the tail water complex supervision center generates a supervision instruction according to the operation of the tail water circulation treatment system, and the supervision instruction is sent to the comprehensive parameter acquisition module. The comprehensive parameter acquisition module operates in coordination with several types of sensors and collects the total water parameters and planting cycle parameters in the aquaculture field 1 and the flowing water tank 2 in real time according to the period, and sends them to the water parameter analyzer and the ecological parameter analyzer respectively.

[0042] The water parameter analyzer is used to calibrate and group the data recorded in real time in the total water parameters according to the acquisition time period, and analyze the salinity S, total nitrogen TN, and total phosphorus TP to generate a single-number salt adjustment signal and a multi-level signal. The process of analyzing the received total water parameters by the water parameter analyzer within the period is as follows:

[0043] The total water parameters are composed of the pH value, salinity S, total nitrogen TN, and total phosphorus TP in the tail water based on the multi-parameter water quality monitoring buoy. Data is collected every 15 minutes to construct an acquisition period, and the time sequence mark of each acquisition period is used as the group number F1, F2, F3,..., Fn, where n is a natural number greater than zero;

[0044] The salinity within a single group number is processed formulaically according to the linear regression model, and its salinity is converted based on the conductivity. The specific formula is: S = a × EC + b;

[0045] Among them, EC is the conductivity in μS / CM, a and B are experimental ratio analysis coefficients. By preparing water samples with different salinities in the laboratory, such as 3‰, 5‰, and 7‰, and measuring the conductivity EC, the coefficients are obtained through linear regression analysis. a = 0.00147 and b = -0.133, but not limited to this;

[0046] By measuring the conductivity of the water body, substituting it into the formula to calculate the salinity, and determining whether it exceeds the aquaculture tolerance range, retrieve the pre-stored salinity percentage threshold from the internal of the tail water complex supervision center:

[0047] If the salinity < the salinity percentage threshold, no salinity adjustment is required;

[0048] If the salinity > the salinity percentage threshold, it is determined that the salinity needs to be regulated during the collection cycle. A targeted single-number salinity adjustment signal is generated based on the difference in salinity (salt difference) between the salinity and the salinity percentage threshold. The single-number salinity adjustment signal includes the salt difference, and it is sent to the regulation decision-making module. After receiving the single-number salinity adjustment signal, the regulation decision-making module immediately generates text in the format of "Number ** / Salinity anomaly / Alarm reminder" and displays it on the display screen of the tail water complex supervision center, along with an alarm prompt sound of "Drip, drip, drip" at intervals of 2 seconds to remind the supervision personnel, and at the same time activates the salinity anomaly plan stored in the internal of the tail water complex supervision center, opens the electric valves of the inlet channel and the outlet channel to keep the tail water flowing, and at the same time starts the fresh water dilution pump to reduce the salinity.

[0049] The analysis process of the nitrogen and phosphorus over-standard content based on the total water parameters is as follows:

[0050] Retrieve the total nitrogen TN and total phosphorus TP within the single group number, and construct the nitrogen and phosphorus over-standard rate formula according to the mathematical multiplication and division ratio calculation: , ;

[0051] Retrieve the aquaculture tail water discharge standard values from the internal of the tail water complex supervision center and compare and analyze them with the TN over-standard rate and the TP over-standard rate:

[0052] If the TN over-standard rate > the standard value and the TP over-standard rate < the standard value, a first-level signal is generated;

[0053] If the TN over-standard rate < the standard value and the TP over-standard rate > the standard value, a second-level signal is generated;

[0054] If the TN over-standard rate > the standard value and the TP over-standard rate > the standard value, a third-level signal is generated;

[0055] Send the generated signal to the regulation decision-making module;

[0056] After receiving the single-number salt regulation signal and the primary signal, the regulation decision-making module opens the electric valves of the water inlet channel and the water outlet channel according to the differential salt difference in the single-number salt regulation signal, increases the contact time between the flowing water and the plants inside the aquaculture field 1, starts the fresh water dilution pump, supplements a certain amount of phosphorus during the fresh water dilution period, and maintains the nitrogen-phosphorus balance;

[0057] After receiving the single-number salt regulation signal and the secondary signal, the regulation decision-making module opens the electric valves of the water inlet channel and the water outlet channel according to the differential salt difference in the single-number salt regulation signal, increases the contact time between the flowing water and the plants inside the aquaculture field 1, starts the fresh water dilution pump, supplements a certain amount of nitrogen during the fresh water dilution period, and maintains the nitrogen-phosphorus balance;

[0058] After receiving the single-number salt regulation signal and the tertiary signal, the regulation decision-making module starts the fresh water dilution pump according to the differential salt difference in the single-number salt regulation signal. The regulation decision-making module opens the electric valves of the water inlet channel and the water outlet channel according to the tertiary signal, increases the contact time between the flowing water and the plants inside the aquaculture field 1, promotes the uniform mixing of nitrogen and phosphorus in the tail water, and neutralizes the total nitrogen and phosphorus ratio in the tail water; It should be noted that: the exceedance rate > 1 indicates that the pollutant exceeds the standard, and the larger the value, the more serious the pollution, which is used to guide the regulation intensity. The standard value is based on the aquaculture tail water standard. For example: TN ≤ 1.5 mg / L, TP ≤ 0.3 mg / L. If the salinity S > 5% or the nitrogen and phosphorus exceedance rate > 1, then start the fresh water dilution pump or increase the water flow rate in the ecological purification area.

[0059] Example 2: This example is a saline-alkali land aquaculture tail water circulation treatment system, including an ecological parameter analyzer for analyzing the nitrogen and phosphorus absorption amounts of salt-tolerant plants, the tail water residence time, and the absorption amount of filter-feeding organisms in the data of the planting cycle parameters. The process of the ecological parameter analyzer analyzing the received planting cycle parameters within the cycle is as follows:

[0060] Collect the growth indexes of the salt-tolerant plants in the aquaculture field 1, namely the plant height H, the coverage rate C, and the density M of the filter-feeding organisms, through the ecological monitoring benchmark, store them in the corresponding groups according to the collection time, and calculate the nitrogen and phosphorus absorption amounts of the salt-tolerant plants: , ;

[0061] Among them, k1 and k2 represent the experimentally determined nitrogen and phosphorus absorption coefficients of salt-tolerant plants. k1 can take the value of 0.05 mg / cm2·d / TN, and k2 can take the value of 0.01 mg / cm2·d / TP, which is not limited to this.

[0062] After obtaining the TN absorption amount and the TP absorption amount, retrieve the tail water residence time formula from the tail water complex supervision center: ;

[0063] Among them, t represents optimizing the ecological purification efficiency, which refers to adjusting the tail water residence time or other water body parameters to make the removal effect of pollutants in the tail water by the ecosystem reach the best state. The ecosystem includes plants, microorganisms, and filter-feeding organisms, and the pollutants in the tail water include nitrogen and phosphorus. V represents the measured value of the water volume of the water body in the collection area during the experiment, and Q represents the detected flow value of the tail water.

[0064] Multiply the TN 实测 and TP 实测 collected during this period by Q and t respectively to obtain the nitrogen load value and the phosphorus load value. Specifically, the nitrogen load value = TN 实测 ×Q×t, and the phosphorus load value = TP 实测 ×Q×t;

[0065] Mark the comprehensive result of the nitrogen load value and the phosphorus load value as the nitrogen and phosphorus load of the tail water, and retrieve the plant absorption amount stored in the conventional test from the tail water complex supervision center for comparison and analysis with the nitrogen and phosphorus load of the tail water:

[0066] If the plant absorption amount > the nitrogen and phosphorus load of the tail water, the purification ability meets the standard;

[0067] If the plant absorption amount < the nitrogen and phosphorus load of the tail water, it means that the plant purification is insufficient, generate a nitrogen and phosphorus regulation signal and send it to the regulation decision-making module;

[0068] Example:

[0069] 1. Conditions:

[0070] Suppose the tail water TN load in a certain period is 100 mg / h;

[0071] The plant coverage rate C = 50%;

[0072] The plant height H = 20 cm;

[0073] k1 = 0.05 mg / cm2·d.

[0074] 2. Calculate the absorption amount: The TN absorption amount = 0.5×20×0.05 = 0.5 mg / cm2·d.

[0075] 3. Assign the result:

[0076] If the area of the ecological purification area is 1000 m², the total absorption amount is 0.5×1000×10000×10 6 = 5000 mg / d;

[0077] If the daily TN load of the tail water is 6000 mg / d, the absorption amount is insufficient, and it is necessary to increase the plant coverage rate or optimize the growth conditions.

[0078] After receiving the nitrogen and phosphorus regulation signal, the regulation decision-making module, based on the measured tail water data for generating tail water nitrogen and phosphorus load data, according to the difference between the nitrogen and phosphorus contents and the plant absorption amount in the tail water data, combined with the actual tail water ratio experience, opens the electric valves of the water inlet channel and the water outlet channel between the aquaculture field 1 and the flow-through tank 2, promotes the flow of tail water inside the aquaculture field 1 and the flow-through tank 2, and additionally starts the fresh water dilution pump to dilute the tail water.

[0079] Retrieve the preset tail water residence time from the tail water complex supervision center and compare it with t:

[0080] If t ≥ the preset tail water residence time, the purification requirement is met;

[0081] If t ≤ the preset tail water residence time, the purification requirement is not met, a delay signal is generated, and the delay signal is sent to the regulation decision-making module;

[0082] Example:

[0083] 1. Conditions:

[0084] The water volume V of the ecological purification area is 1000 m³;

[0085] The tail water flow rate Q = 100 m³ / h.

[0086] 2. Discrimination criteria:

[0087] Qualified standard: If t ≥ 12 hours, the purification requirement is met;

[0088] Abnormal situation: If t < 12 hours, the residence time needs to be extended.

[0089] 3. Calculate the residence time: = 10 hours.

[0090] 4. Result comparison: If it is required that t ≥ 12 hours, the flow rate needs to be reduced to Q ≤ 83.3 m³ / h.

[0091] After receiving the delay signal, the regulation decision-making module immediately generates text in the style of "regional order number ** / delay processing / warning reminder" and displays it on the display screen of the tail water complex supervision center to remind the supervisors, and starts the corresponding plan for the delay signal, controls the opening and closing of the electric valves of the water inlet channel and the water outlet channel between the aquaculture field 1 and the flow-through tank 2, delays the tail water flow rate, replants plants, increases the aeration volume, improves the dissolved oxygen, promotes the microbial activity, and releases filter-feeding organisms. The specific delay time is set according to the difference between t and the preset tail water residence time, and is not limited to this.

[0092] The density of filter-feeding organisms M is counted by underwater cameras, combined with the von Bertalanffy growth model of fish to predict the nitrogen and phosphorus absorption capacity, and the pre-stored predicted absorption range is retrieved from the tailwater complex supervision center, according to the product formula: filter-feeding organism absorption = M × daily absorption of a single fish;

[0093] The predicted uptake range was compared with that of filter-feeding organisms:

[0094] If the absorption of filter-feeding organisms is within the predicted absorption range, it means that the biological purification of tailwater in this area is qualified;

[0095] If the absorption of filter-feeding organisms is less than the predicted absorption range, it means that the biological purification of the tailwater in this area fails. The daily absorption of a single fish is the nitrogen and phosphorus content absorbed by each fish in the experimental data;

[0096] The total absorption is obtained by summing the plant absorption and the absorption of filter-feeding organisms that fail purification:

[0097] If the total absorption amount ≥ tailwater nitrogen and phosphorus load, it means that the overall tailwater purification meets the standard;

[0098] If the total absorption amount is ≤ the tailwater nitrogen and phosphorus load, it means that the overall tailwater purification is abnormal, and a biological control signal is generated and sent to the control decision module;

[0099] After receiving the biological control signal, the control decision module immediately generates text in the format of "area order number ** / filtration suction unqualified / total suction abnormal / alarm reminder" and sends it to the display screen of the tailwater complex supervision center to remind the supervisor to handle it. At the same time, it starts the plan corresponding to the biological control signal, operates the electric valves of the inlet and outlet channels connected between the breeding field 1 and the water flow channel 2, and the fresh water dilution pump, adjusts the tailwater treatment according to the data, accelerates the tailwater flow rate, increases the stocking density, and optimizes the bait.

[0100] In combination with Example 1 and Example 2, the tailwater salinity, nitrogen and phosphorus content and ecological indicators are collected in real time through multi-parameter water quality monitoring buoys and ecological monitoring benchmarks, and water quality anomalies are accurately identified based on the conductivity conversion model and exceedance rate analysis, and control signals are generated to control freshwater dilution pumps, electric valves and other equipment in a linked manner to achieve dynamic compliance with salinity and nitrogen and phosphorus concentrations.

[0101] The system innovatively constructs a closed ecological chain of "plant absorption + biological purification + residence time optimization". By quantifying the nitrogen and phosphorus absorption of plants and the purification capacity of filter-feeding organisms, it automatically adjusts the water flow path, replenishes the biological density or extends the residence time to ensure the efficient removal of pollutants. The treated water is recycled after purification, reducing water resource consumption and the use of chemical agents. The supervision center realizes the full-process control through modular integration and graphical interface, supports multi-dimensional data overlay analysis, and adapts to seasonal changes and aquaculture load fluctuations, providing an economical, efficient and eco-friendly tail water treatment solution for saline-alkali land aquaculture.

[0102] The above content is only an example and illustration of the structure of the present invention. Those skilled in the art of this technology can make various modifications, supplements or use similar methods to replace the specific embodiments described, as long as they do not deviate from the structure of the invention or exceed the scope defined by this claim book, they shall fall within the protection scope of the present invention.

[0103] In the description of this specification, the descriptions referring to terms such as "one embodiment", "example", "specific example", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. The relevant fittings include commonly used mechanical connection components in this field such as couplings, lead screws, gears, gaskets, etc., and are not limited thereto. The connection method is specifically replaced and adapted according to actual use.

[0104] The above-disclosed preferred embodiments of the present invention are only used to help illustrate the present invention. The preferred embodiments do not elaborate all the details, nor do they limit the present invention to only the specific implementation manners. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments to better explain the principle and practical application of the present invention, so that those skilled in the art of this technology can understand and utilize the present invention well. The present invention is only limited by the claim book and its full scope and equivalents.

Claims

1. A tail water circulation treatment system for aquaculture in saline-alkali land, comprising a breeding field (1), a flowing water tank (2) and a supervision center for the tail water complex, characterized in that, An intake channel and an outlet channel are provided to connect the aquaculture field (1) and the flow-through tank (2). Inside the flow-through tank (2), a deep water area (5) and a slow water area (3) are provided. At the top of the deep water area (5), a waterwheel aerator (6) is provided. A partitioned filter dam (4) is provided between the slow water area (3) and the deep water area (5). Inside the aquaculture field (1) and the flow-through tank (2), a number of multi-parameter water quality monitoring buoys and a number of ecological monitoring poles are provided; The tail water complex supervision center is communicatively connected to a comprehensive parameter acquisition module, a water parameter analyzer, an ecological parameter analyzer, and a regulation decision-making module; the comprehensive parameter acquisition module periodically and real-time collects the total water parameters and planting cycle parameters in the aquaculture field (1) and the flow-through tank (2), and sends them to the water parameter analyzer and the ecological parameter analyzer respectively; The water parameter analyzer is used to calibrate and group the data recorded in real time in the total water parameters according to the acquisition time period, analyze the salinity S, total nitrogen TN, and total phosphorus TP to generate a single-number salt regulation signal and a multi-level signal, and send them to the regulation decision-making module to adjust the tail water treatment process; The ecological parameter analyzer is used to analyze the nitrogen and phosphorus absorption amounts of salt-tolerant plants, the tail water residence time, and the absorption amount of filter-feeding organisms in the planting cycle parameters, and send the generated nitrogen and phosphorus regulation signals, delay signals, and biological regulation signals to the regulation decision-making module to regulate the tail water according to the analysis results; The process of in-cycle analysis and processing of the planting cycle parameters by the ecological parameter analyzer is as follows: The growth indexes of salt-tolerant plants in the aquaculture field (1), namely plant height H, coverage rate C, and density M of filter-feeding organisms, are collected through ecological monitoring benchmarks. They are stored in the corresponding groups according to the collection time, and the nitrogen and phosphorus absorption amounts of the salt-tolerant plants are calculated as follows: , , where k1 and k2 represent the nitrogen and phosphorus absorption coefficients of the salt-tolerant plants determined by experiments. k1 can take a value of 0.05 mg / cm2·d / TN, and k2 can take a value of 0.01 mg / cm2·d / TP.

2. The tail water circulation treatment system for saline-alkali land aquaculture according to claim 1, characterized in that, The process of in-cycle analysis of the total water parameters received by the water parameter analyzer is as follows: The total water parameters consist of the pH value, salinity S, total nitrogen TN, and total phosphorus TP in the tail water. Data is collected every 15 minutes to construct an acquisition cycle. Each acquisition cycle is sequentially marked as a group number F1, F2, F3,..., Fn, where n is a natural number greater than zero; The salinity within a single group number is processed formulaically according to a linear regression model. It converts salinity based on the conductivity method. The specific formula is: S = a×EC + b, where EC is the conductivity μS / CM, and a and B are experimental ratio analysis coefficients. By measuring the conductivity of the water body and substituting it into the formula to calculate the salinity, it is judged whether it exceeds the aquaculture tolerance range. The pre-stored salt percentage threshold is retrieved from inside the tail water complex supervision center. If the salinity > the salt percentage threshold, it is judged that the salinity needs to be regulated within this acquisition cycle, and a targeted single-number salt regulation signal is generated based on the difference salt difference between the salinity and the salt percentage threshold.

3. The tail water recycling treatment system for saline-alkali land aquaculture according to claim 2, characterized in that, The analysis process for the excessive nitrogen and phosphorus content based on the total water parameters is as follows: Retrieve the total nitrogen (TN) and total phosphorus (TP) within a single group number, and construct a nitrogen and phosphorus over-standard rate formula based on mathematical multiplication and division ratios: , , retrieve the aquaculture tail water discharge standard values, TN over-standard rate, and TP over-standard rate from the tail water complex supervision center for comparison and analysis. If the TN over-standard rate > standard value and the TP over-standard rate < standard value, generate a first-level signal; if the TN over-standard rate < standard value and the TP over-standard rate > standard value, generate a second-level signal; if the TN over-standard rate > standard value and the TP over-standard rate > standard value, generate a third-level signal, and send the generated signal to the regulation decision-making module.

4. A saline-alkali land aquaculture tail water recycling treatment system according to claim 1, characterized in that, After obtaining the TN absorption amount and TP absorption amount, retrieve the tail water residence time formula from the tail water complex supervision center: , where t represents optimizing the ecological purification efficiency, which refers to adjusting the tail water residence time or other water body parameters to achieve the best state of pollutant removal from the tail water by the ecological system. The ecological system includes plants, microorganisms, and filter-feeding organisms, and the pollutants in the tail water include nitrogen and phosphorus. V represents the experimentally measured value of the water body volume in the collection area, and Q represents the tail water detection flow value.

5. The tail water circulation treatment system for saline-alkali land aquaculture according to claim 4, characterized in that, The TN collected during this period 实测 , TP 实测 are respectively multiplied by Q and t to obtain the nitrogen load value and the phosphorus load value. The comprehensive result of the nitrogen load value and the phosphorus load value is marked as the nitrogen and phosphorus load of the tail water. The plant absorption amount stored in the conventional test is retrieved from the tail water complex supervision center and compared with the nitrogen and phosphorus load of the tail water for analysis. If the plant absorption amount > the nitrogen and phosphorus load of the tail water, the purification capacity meets the standard; if the plant absorption amount < the nitrogen and phosphorus load of the tail water, it means that the plant purification is insufficient, and a nitrogen and phosphorus regulation signal is generated and sent to the regulation decision-making module; Retrieve the preset tail water residence time from the tail water complex supervision center and compare it with t. If t ≥ the preset tail water residence time, the purification requirement is met; if t ≤ the preset tail water residence time, the purification requirement is not met, a delay signal is generated, and the delay signal is sent to the regulation decision-making module.

6. The tail water circulation treatment system for saline-alkali land aquaculture according to claim 5, characterized in that, The density of filter-feeding organisms M is counted by underwater cameras, combined with the von Bertalanffy growth model of fish to predict the nitrogen and phosphorus absorption capacity, and the pre-stored predicted absorption range is retrieved from the tailwater complex supervision center. According to the product formula: filter-feeding organism absorption = M × single fish daily absorption, the predicted absorption range is compared with the filter-feeding organism absorption. If the filter-feeding organism absorption is within the predicted absorption range, it means that the tailwater biological purification in this area is qualified. If the filter-feeding organism absorption is less than the predicted absorption range, it means that the tailwater biological purification in this area is unqualified. The single fish daily absorption is the nitrogen and phosphorus content absorbed by each fish in the experimental data; The plant absorption amount is obtained and the absorption amount of the filter-feeding organisms that fail the purification is summed to obtain the total absorption amount. If the total absorption amount is ≥ the tail water nitrogen and phosphorus load, it means that the overall tail water purification meets the standard. If the total absorption amount is ≤ the tail water nitrogen and phosphorus load, it means that the overall tail water purification is abnormal, and a biological control signal is generated and sent to the control decision module.

7. A working method of a tail water recycling treatment system for saline-alkali land aquaculture, which is used for the saline-alkali land aquaculture tail water recycling treatment system according to any one of claims 1-6, characterized in that, The following steps are involved: Water quality testing: Real-time data monitoring and collection of tailwater from aquaculture fields (1) and water troughs (2) is performed using multi-parameter water quality monitoring buoys and ecological monitoring poles; Data processing: By analyzing the total water parameters and plant cycle parameters of the collected data, the salinity, nitrogen and phosphorus exceeding standard rate, plant purification efficiency and filter feeding biological absorption efficiency are calculated through formulas; Control and relief: According to the analysis results, the electric valve, fresh water dilution pump and waterwheel aerator are controlled in a linked manner to achieve dynamic control of tailwater salinity and nitrogen and phosphorus concentrations; Data display: The tailwater complex supervision center displays abnormal data areas through a graphical interface to assist manual intervention.

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