A device and method for treating mariculture effluent

Abstract

The application relates to the technical field of mariculture tail water treatment equipment, and discloses a mariculture tail water treatment device and method, which comprises a pretreatment tank, a reactor, a medicament feeding unit, a drain pipe, a filtering unit, a light shielding layer and an LED lamp strip. The application integrates pretreatment, water feeding, self-adaptive illumination, stirring, static separation and online monitoring into one, and realizes the collaborative linkage of various modules through a control unit. The operation parameters can be adjusted in real time according to the water quality of the mariculture tail water and the reaction state, the treatment efficiency of the mariculture tail water is improved, the medicament feeding unit is additionally arranged in the tail water treatment, can be efficiently cooperated with the ABGS biological carrier and the microorganisms in the reactor, the deep removal of pollutants is realized, the flocculation, denitrification, phosphorus removal and coagulation are integrated, the flocculation speed is fast, stable flocs can be quickly formed, the mud-water separation time is shortened, and the efficiency of the whole treatment cycle is improved.

Description

Technical Field

[0001] This invention belongs to the field of marine aquaculture wastewater treatment equipment, specifically relating to a marine aquaculture wastewater treatment device and method. Background Technology

[0002] Marine aquaculture wastewater typically contains residual feed and nutrients such as nitrogen and phosphorus produced by the decomposition of biological excrement. Direct discharge of such wastewater can easily cause ecological problems such as nearshore eutrophication and red tides. This type of wastewater is characterized by high salinity, relatively low pollutant concentration, low carbon-to-nitrogen ratio, and high dissolved oxygen content. Traditional biological treatment technologies such as activated sludge process have problems such as high aeration energy consumption, poor sludge settling properties, and low nitrogen and phosphorus removal efficiency. At the same time, the high dissolved oxygen characteristics of seawater will inhibit denitrification and phosphorus release by polyphosphate-accumulating bacteria, further limiting the treatment efficiency. This application proposes a marine aquaculture wastewater treatment device and method to improve upon the aforementioned deficiencies. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a marine aquaculture wastewater treatment device and method with a powerful and rapid treatment function for marine aquaculture wastewater.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A marine aquaculture wastewater treatment device and method are disclosed, comprising a pretreatment tank, a reactor, a chemical dosing unit, a drain pipe, a filtration unit, and a light-shielding layer. One end of the pretreatment tank is connected to the reactor. The chemical dosing unit is installed on the top of the reactor. A drain pipe is installed on the side of the reactor away from the pretreatment tank. A filtration unit is installed on the drain pipe. A light-shielding layer is installed on the outer wall of the reactor.

[0005] In one specific implementation, the light-shielding layer is an opaque fabric that is movably installed between the reactor and the reactor, and can be removed from the reactor when not in use.

[0006] In one specific implementation scheme, the pretreatment tank includes a tailwater inlet pipe, a bar screen, and an inlet pipe. One end of the pretreatment tank is connected to the tailwater inlet pipe, and a bar screen is installed at the port of the tailwater inlet pipe near the pretreatment tank. The other end of the pretreatment tank is connected to the inlet pipe, and the height of the inlet pipe is higher than the height of the sediment inside the pretreatment tank, and it is an inclined structure.

[0007] In one specific implementation scheme, the mesh size of the grid filter is 1-5mm, which can intercept large particulate suspended matter in aquaculture wastewater.

[0008] In one specific implementation, an LED light strip is installed on the outside of the reactor cylinder wall. The LED light strip is a wraparound light strip that is evenly wrapped around the outside of the reactor. It uses red and blue dual-color LEDs with a red light wavelength of 660nm and a blue light wavelength of 450nm. The ratio of red light to blue light is adjustable, with an adjustment range of 3:1 to 5:1. A light sensor is installed on the inner wall of the reactor to monitor the light intensity of the LED light strip in real time.

[0009] In one specific implementation, the reactor further includes a port, a fast stirring assembly, and a slow stirring assembly. The port is provided on the side wall of the reactor body and is connected to the water inlet pipe. The reactor is equipped with a fast stirring assembly and a slow stirring assembly inside. The fast stirring assembly and the slow stirring assembly are both located at the same center as the reactor and are respectively connected to the top and bottom of the reactor for installation.

[0010] In one specific implementation scheme, the agent dispensing unit includes a storage tank, a ring pipe, a metering pump, a discharge pipe, a universal ball, and an atomizing nozzle. The bottom port of the storage tank is connected to the ring pipe. The metering pump is installed on the ring pipe. Several discharge pipes are arrayed on the inner wall of the ring pipe. A universal ball is rotatably fitted on several of the discharge pipes. The end of the universal ball away from the discharge pipe is connected to the atomizing nozzle. A through groove is opened on the inner wall of the universal ball to connect the atomizing nozzle and the discharge pipe.

[0011] In one specific implementation scheme, the metering pump is a high-precision variable frequency metering pump with an accuracy of ±0.1 mg / L, which can achieve continuous adjustment of the dosage within the range of 1-100 mg / L, and is electrically connected to an external control unit.

[0012] In one specific implementation, the omnidirectional ball can rotate inside the discharge pipe, thereby adjusting the spray angle and spray range of the atomizing nozzle.

[0013] In one specific implementation scheme, the pharmaceutical formula in the storage tank, by weight, is 15-25 parts modified zeolite powder, 10-18 parts polyaluminum chloride, 8-12 parts polyaspartic acid, 5-9 parts gallic acid, 3-7 parts sodium carboxymethyl cellulose, 2-4 parts compound probiotic agent, and 30-40 parts deionized water.

[0014] In one specific implementation, the rapid stirring assembly includes a motor, gears, driven gears, a main shaft, and stirring components. The motor is mounted on the top of the reactor, and its output end is connected to the gears. Driven gears mesh on both sides of the gears, and the central ends of the two driven gears are connected to the main shafts. The two main shafts rotate with the reactor and extend into the reactor's interior. Stirring components capable of stirring the tailwater are mounted on both main shafts. The two stirring components are arranged crosswise on the main shafts, and the distance between them is greater than half the width of a single stirring component.

[0015] In one specific implementation scheme, the stirring component includes a stirring frame, shear blades, curved blade assembly, hollow grooves, and a retaining ring. The stirring frame is connected to the main shaft. Several shear blades are arranged at equal intervals on both sides of the stirring frame. A curved blade assembly connected to the main shaft is provided at the center of the stirring frame. Hollow grooves are provided on each blade of the curved blade assembly. A retaining ring is connected to the outside of the curved blade assembly.

[0016] In one specific implementation, the curved blades on the curved blade assembly simultaneously generate axial and radial flow, and hollow grooves are provided on the blades. When the tailwater fluid passes through the hollow grooves, it forms a secondary jet and a local vortex, eliminating the dead zone of the tailflow.

[0017] In one specific implementation, the slow stirring assembly includes a motor, a column, and anchor blades. The motor is fixed to the bottom of the reactor, and the output end of the motor is connected to the column. Several anchor blades are arranged in a ring on the column.

[0018] In one specific implementation, the fast stirring component and the slow stirring component can be controlled independently, and the stirring speed can be automatically adjusted according to different stages of the light-dark reaction.

[0019] In one specific implementation, a monitoring module is installed on the inner wall of the reactor, the monitoring module having a built-in DO sensor, pH sensor, COD sensor, TIN sensor, and... The sensors are all electrically connected to the control unit and can monitor the concentrations of DO, pH, COD, total inorganic nitrogen, and phosphate in the reactor in real time, and transmit the monitoring data to the control unit.

[0020] In one specific implementation, the filtration unit includes a quartz sand filter layer, an activated carbon filter layer, and an ultrafiltration membrane assembly, wherein the quartz sand filter layer, the activated carbon filter layer, and the ultrafiltration membrane assembly are an integrated composite structure.

[0021] In a specific feasible implementation, a marine aquaculture wastewater treatment device is used as follows: S1, Select mixed sludge of bacteria and algae from coastal waters as inoculation sludge, and introduce it into the main body of the reactor. Then, discharge the pre-treated and filtered aquaculture wastewater into the reactor through the inlet pipe in the pretreatment tank. Debug each module to ensure that the control unit can control the operation of each module normally and that the data acquisition of the online monitoring module is accurate. S2. After the water intake is completed, a composite treatment agent adapted to the high-salt environment of seawater is added into the reactor through the agent dosing unit. The agent can synergistically enhance the treatment effect with the microorganisms on ABGS. Its formula by weight is: 15-25 parts modified zeolite powder, 10-18 parts polyaluminum chloride, 8-12 parts polyaspartic acid, 5-9 parts gallic acid, 3-7 parts sodium carboxymethyl cellulose, 2-4 parts compound probiotic agent, and 30-40 parts deionized water. S3. After the reagent is added, the control unit presets the treatment cycle and the duration of each sub-cycle. One treatment cycle is divided into n consecutive sub-cycles, with the number of sub-cycles n=3-5. The control unit turns off the LED light strip and installs the light-shielding layer on the outer wall of the reactor. The fast and slow stirring components are started to stir the effluent and reagent inside the reactor, maintaining the dark reaction stage for 30 minutes. During this process, the DO sensor monitors the DO concentration in real time to ensure it is maintained below 0.5 mg / L. The denitrifying bacteria in ABGS utilize the carbon source for denitrification, and the polyphosphate-accumulating bacteria release phosphorus. At the end of the dark reaction... The concentration increased to 1.8-2.0 mg / L; S4. After the dark reaction stage ends, the control unit turns on the LED light strip, adjusts the ratio of red light to blue light to 4:1, and monitors the light intensity in real time by the light sensor to maintain the light reaction stage for 60-80 minutes. In S5, microalgae in ABGS photosynthesize to produce oxygen, creating an aerobic environment within the reactor. Nitrifying bacteria oxidize ammonia nitrogen to nitrite, which then directly undergoes denitrification, shortening the nitrogen removal path and conserving carbon sources. Simultaneously, polyphosphate-accumulating bacteria utilize previously stored carbon sources and photosynthetic oxygen production to absorb excess phosphorus, achieving highly efficient phosphorus removal. Meanwhile, the monitoring module monitors DO concentration in real time, and by adjusting the light intensity, the DO concentration during the photocatalytic reaction stage is controlled at 1.0-2.0 mg / L, promoting efficient short-cut nitrification and denitrification. S6. Repeat steps 3-5 a total of n times to complete n sub-cycles of cyclic reaction. After the photo-reaction stage of the last sub-cycle ends, the control unit stops the stirring and allows the tailwater to settle in the reactor for 5-10 minutes. After settling, the treated tailwater supernatant is discharged through the drain pipe on one side of the reactor, completing a complete treatment cycle.

[0022] According to the above-mentioned technical solution, the present invention provides a marine aquaculture wastewater treatment device and method, which has the following beneficial effects: (1) This invention integrates pretreatment, water intake, adaptive lighting, stirring, static separation and online monitoring into one unit. The control unit enables the coordinated linkage of each module and can adjust the operating parameters in real time according to the water quality and reaction status of the aquaculture wastewater, thereby improving the treatment efficiency of aquaculture wastewater.

[0023] (2) By adding a reagent dosing unit in the tailwater treatment, the present invention can work in synergy with the ABGS biological carrier and the microorganisms in the reactor to achieve deep removal of pollutants. It integrates flocculation, denitrification, phosphorus removal and coagulation aid. The flocculation speed is fast and stable flocs can be formed quickly, shortening the mud-water separation time and improving the efficiency of the entire treatment cycle.

[0024] (3) By adding a fast stirring component and a slow stirring component in the reactor, the present invention can be controlled separately and automatically adjust the stirring speed according to the different stages of light and dark reaction in the tailwater treatment to ensure the uniformity of mud and water and reagent mixing.

[0025] (4) This invention uses LED light strips on the outside of the reactor, with red and blue mixed light as the light source, and utilizes the photosynthetic oxygen production of microalgae to completely replace traditional mechanical aeration, thereby achieving the cultivation of bacterial and algal granular sludge and the efficient purification of seawater aquaculture tailwater, greatly reducing energy consumption. At the same time, the bacterial and algal granular sludge has good settling performance, stable operation and strong resistance to load shock.

[0026] (5) The present invention provides a filter unit at the reactor drain pipe, which uses a quartz sand filter layer to trap larger flocs, an activated carbon filter layer to adsorb residual odors and trace organic matter in the tailwater, and finally an ultrafiltration membrane module to trap tiny algal cells, colloids and complexed algal toxins, ensuring clear effluent. Attached Figure Description

[0027] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the structure of a marine aquaculture wastewater treatment device and method according to an embodiment of this application; Figure 2 This is a schematic diagram of the pretreatment pool structure in an embodiment of this application; Figure 3 This is a schematic diagram of the LED light strip structure in the embodiments of this application; Figure 4 This is a schematic diagram of the reactor structure in an embodiment of this application; Figure 5 This is a schematic diagram of the drug delivery unit in an embodiment of this application; Figure 6 This is a schematic diagram of the structure of the rapid stirring component in the embodiments of this application; Figure 7This is a schematic diagram of the structure of the stirring component in the embodiments of this application; Figure 8 This is a schematic diagram of the installation of the monitoring module in an embodiment of this application; Figure 9 This is a schematic diagram of the slow stirring component in an embodiment of this application; Figure 10 This is a graph showing the changes in DO and pH values ​​during the sub-cycle in the embodiments of this application; Figure 11 This is a comparison diagram of phosphorus removal activity of the bacterial system during the sub-cycle in the embodiments of this application; Figure 12 This is a schematic diagram of the structure of the filtering unit in the embodiments of this application.

[0028] In the diagram: Pretreatment tank-1, Reactor-2, Chemical dosing unit-3, Drainage pipe-4, Filtration unit-5, Light shielding layer-6, Tailwater inlet pipe-11, Grille filter-12, Inlet pipe-13, LED light strip-7, Port-21, Rapid stirring assembly-22, Slow stirring assembly-23, Storage tank-31, Circular pipe-32, Metering pump-33, Discharge pipe-34, Universal ball-shaped nozzle-35, Atomizing nozzle-36, Motor-221, Gear-222, Driven gear-223, Main shaft-224, Stirring component-225, Stirring frame-41, Shear blade-42, Curved blade assembly-43, Hollowed-out groove-44, Protective ring-45, Motor-231, Column-232, Anchor blade-233, Monitoring module-8, Quartz sand filter layer-51, Activated carbon filter layer-52, Ultrafiltration membrane assembly-53. Detailed Implementation

[0029] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0030] Example 1: Please refer to Figures 1-11 The specific embodiments of the present invention are as follows: A marine aquaculture wastewater treatment device and method are disclosed, comprising a pretreatment tank 1, a reactor 2, a chemical dosing unit 3, a drain pipe 4, a filter unit 5, and a light-shielding layer 6. One end of the pretreatment tank 1 is connected to the reactor 2. The chemical dosing unit 3 is installed on the top of the reactor 2. The drain pipe 4 is installed on the side of the reactor 2 away from the pretreatment tank 1. The filter unit 5 is installed on the drain pipe 4. The light-shielding layer 6 is installed on the outer wall of the reactor 2.

[0031] Please see Figure 1 The light-shielding layer 6 is an opaque fabric that is movably installed between the reactor 2 and the reactor 2. When it is not in use, it can be removed from the reactor 2. The light-shielding layer 6 isolates the interference of external natural light and avoids affecting the effect of the alternating light and dark reaction inside the reactor 2.

[0032] Please see Figure 2 The pretreatment tank 1 includes a tailwater inlet pipe 11, a bar screen 12, and an inlet pipe 13. One end of the pretreatment tank 1 is connected to the tailwater inlet pipe 11, through which the aquaculture tailwater that needs to be treated is discharged into the pretreatment tank 1. A bar screen 12 is installed at the port of the tailwater inlet pipe 11 near the pretreatment tank 1. The other end of the pretreatment tank 1 is connected to the inlet pipe 13. The height of the inlet pipe 13 is higher than the height of the sediment inside the pretreatment tank 1, and it is inclined to facilitate the discharge of the pretreated aquaculture tailwater into the reactor 2. A solenoid valve is installed on the inlet pipe 13 and is electrically connected to the control unit, which can accurately control the discharge flow rate of the aquaculture tailwater.

[0033] Please see Figure 2 The mesh size of the grid filter 12 is 1-5mm, which can intercept large suspended particles in the aquaculture effluent, such as uneaten feed, feces, and aquaculture waste, reducing the load on subsequent treatment.

[0034] Please see Figure 3 An LED light strip 7 is installed on the outside of the reactor 2 cylinder wall. The LED light strip 7 is a wraparound light strip that is evenly wrapped around the outside of the reactor 2. It uses red and blue dual-color LEDs with a red wavelength of 660nm and a blue wavelength of 450nm. The ratio of red light to blue light is adjustable, with an adjustment range of 3:1-5:1. A light sensor is installed on the inner wall of the reactor 2 to monitor the light intensity of the LED light strip 7 in real time. Through an external control unit electrically connected to the LED light strip 7, the light intensity can be automatically adjusted according to the DO concentration and the growth status of bacteria and algae in the photoreaction stage. The adjustment range is 1000-2000 lux, thereby enhancing the photosynthetic oxygen production efficiency of microalgae.

[0035] Please see Figure 4 The reactor 2 also includes a port 21, a fast stirring component 22, and a slow stirring component 23. The port 21 is provided on the side wall of the reactor 2 cylinder and is connected to the water inlet pipe 13. The reactor 2 is equipped with a fast stirring component 22 and a slow stirring component 23 inside. The fast stirring component 22 and the slow stirring component 23 are both located at the same center as the reactor 2 and are connected to the top and bottom of the reactor 2 respectively, which can fully stir and mix the mud and water and the reagents inside.

[0036] Please see Figure 5The agent dispensing unit 3 includes a storage tank 31, an annular pipe 32, a metering pump 33, a discharge pipe 34, a universal ball 35, and an atomizing nozzle 36. The storage tank 31 can store the dispensed treatment agent. The bottom port of the storage tank 31 is connected to the annular pipe 32. The metering pump 33 is installed on the annular pipe 32. Several discharge pipes 34 are arrayed on the inner wall of the annular pipe 32. A universal ball 35 is rotatably fitted on the discharge pipes 34. The end of the universal ball 35 away from the discharge pipe 34 is connected to the atomizing nozzle 36. A through groove is opened on the inner wall of the universal ball 35, which connects the atomizing nozzle 36 to the discharge pipe 34. Thus, when the universal ball 35 rotates, the discharge pipe 34 can always be connected to the atomizing nozzle 36 to spray the treatment agent.

[0037] Please see Figure 5 The metering pump 33 is a high-precision variable frequency metering pump with an accuracy of ±0.1 mg / L. It can achieve continuous adjustment of the dosage within the range of 1-100 mg / L. It is electrically connected to an external control unit and can automatically adjust the dosage according to the tailwater data transmitted by the control unit to ensure the accuracy of the dosage.

[0038] Please see Figure 5 The omnidirectional ball 35 can rotate inside the discharge pipe 34, thereby adjusting the spray angle and spray range of the atomizing nozzle 36. The treatment agent is quantitatively discharged into the annular pipe 32 by the metering pump 33 and uniformly sprayed into the interior of the reactor 2 through the atomizing nozzle 36, which can accelerate the mixing reaction of the agent and the tailwater and improve the treatment efficiency of the tailwater.

[0039] Please see Figure 5 The agent in storage tank 31 targets the pollutant characteristics of marine aquaculture tailwater, achieving synergistic effects of flocculation, denitrification, phosphorus removal, and coagulation aid, without secondary pollution. It works synergistically with the microorganisms on ABGS to enhance the treatment effect on tailwater. Its formula, by weight, is 15-25 parts modified zeolite powder, 10-18 parts polyaluminum chloride, 8-12 parts polyaspartic acid, 5-9 parts gallic acid, 3-7 parts sodium carboxymethyl cellulose, 2-4 parts compound probiotic agent, and 30-40 parts deionized water. Among them, the modified zeolite powder is modified with hydrochloric acid at a concentration of 5-8%, a temperature of 60-80℃, and a time of 2-3 hours. The modified zeolite powder has an increased specific surface area and improved adsorption performance, which can efficiently adsorb ammonia nitrogen and heavy metal ions in the effluent. The compound probiotic agent is made by mixing nitrifying bacteria, denitrifying bacteria, and Bacillus in a weight ratio of 2:2:1, which can enhance the denitrification and phosphorus removal effect of the biochemical treatment unit and degrade small molecule organic matter in the effluent. At the same time, the agent can work synergistically with the ABGS biological carrier and the microorganisms in reactor 2 to enhance the physicochemical purification effect, achieve deep removal of pollutants, and integrate flocculation, denitrification, phosphorus removal and coagulation aid. It has a fast flocculation speed, can quickly form stable flocs, shorten the mud-water separation time, and improve the efficiency of the entire treatment cycle.

[0040] Please see Figure 6 The rapid stirring assembly 22 includes a motor 221, a gear 222, a driven gear 223, a main shaft 224, and a stirring element 225. The motor 221 is installed on the top of the reactor 2. The output end of the motor 221 is connected to the gear 222, which can drive the gear 222 to rotate. Driven gears 223 are meshed on both sides of the gear 222. The center ends of the two driven gears 223 are connected to the main shaft 224. The two main shafts 224 rotate with the reactor 2 and extend into the interior of the reactor 2. A stirring element 225 capable of stirring the tailwater is installed on both main shafts 224. The two stirring elements 225 are arranged crosswise on the main shafts 224, and the distance between them is greater than half the width of a single stirring element 225. When the two stirring elements 225 start to rotate crosswise, they do not interfere with each other. The directional flow fields of the two units are in a cross state, and the flow field action areas complement each other, eliminating the stirring dead angle from the root.

[0041] Please see Figures 6-7 The stirring component 225 includes a stirring frame 41, shear blades 42, curved blade assembly 43, hollow grooves 44, and a retaining ring 45. The stirring frame 41 is connected to the main shaft 224. Several shear blades 42 are arranged at equal intervals on both sides of the stirring frame 41. The center of the stirring frame 41 is provided with a curved blade assembly 43 connected to the main shaft 224. Hollow grooves 44 are opened on each blade of the curved blade assembly 43. A retaining ring 45 is connected to the outside of the curved blade assembly 43.

[0042] Please see Figures 6-7 Several shear blades 42 can work together with the stirring frame 41 during stirring to generate stronger turbulent shear force, roll up the sediment such as mud and sand inside the reactor 2 to prevent accumulation, and improve the reaction effect of the reagent.

[0043] Please see Figures 6-7 The curved blades on the curved blade assembly 43 generate axial and radial flow simultaneously, and hollow grooves 44 are provided on the blades. When the tailwater fluid passes through the hollow grooves 44, it forms a secondary jet and a local vortex, eliminating the dead zone of the tailflow.

[0044] Please see Figures 6-8The motor 221 drives the gear 222 connected to it to rotate. Through the meshing of the gear 222 with the driven gears 223 on both sides, the main shaft 224 connected to the two sets of driven gears 223 and the stirring component 225 located on the main shaft 224 can be driven to rotate, thereby mixing and stirring the tailwater and reagents inside the reactor 2.

[0045] Please see Figure 9 The slow stirring component 23 includes a motor 231, a column 232 and an anchor blade 233. The motor 231 is fixed to the bottom of the reactor 2. The output end of the motor 231 is connected to the column 232. Several anchor blades 233 are arranged in a ring on the column 232. The anchor blades 233 can fully stir the water at the bottom of the reactor 2.

[0046] Please see Figures 6-11 The fast stirring component 22 and the slow stirring component 23 can be controlled independently. They can automatically adjust the stirring speed according to different stages of the light and dark reaction to ensure that the mud, water and reagents are mixed evenly.

[0047] Please see Figure 8 The inner wall of reactor 2 is equipped with a monitoring module 8, which contains a DO sensor, a pH sensor, a COD sensor, a TIN sensor, and a [missing information - likely a specific sensor name]. The sensors are all electrically connected to the control unit and can monitor the concentrations of DO, pH, COD, total inorganic nitrogen, and phosphate in reactor 2 in real time. The monitoring data is transmitted to the control unit, which is a PLC controller that receives the real-time data from the monitoring module 8. Through data feedback adjustment, it realizes the automated and coordinated control of operations such as water intake, lighting, and stirring, ensuring a stable and efficient reaction process.

[0048] Based on the above embodiments, a marine aquaculture wastewater treatment device is used in the following manner: S1, Select mixed sludge of bacteria and algae from coastal waters as inoculation sludge, and introduce it into the main body of reactor 2. Then, discharge the pre-treated and filtered aquaculture wastewater into reactor 2 through the inlet pipe 13 in the pretreatment tank 1. Debug each module to ensure that the control unit can control the operation of each module normally and that the data acquisition of the online monitoring module is accurate. S2. After the water intake is completed, a composite treatment agent suitable for the high-salt environment of seawater is added into the reactor 2 through the agent dosing unit 3. The agent can synergistically enhance the treatment effect with the microorganisms on ABGS. Its formula by weight is: 15-25 parts modified zeolite powder, 10-18 parts polyaluminum chloride, 8-12 parts polyaspartic acid, 5-9 parts gallic acid, 3-7 parts sodium carboxymethyl cellulose, 2-4 parts compound probiotic agent, and 30-40 parts deionized water. S3, after the reagent is added, the control unit presets the treatment cycle and the duration of each sub-cycle. One treatment cycle is divided into n consecutive sub-cycles, with the number of sub-cycles n=3-5. The control unit turns off the LED light strip 7 and installs the light-shielding layer 6 on the outer wall of reactor 2. The fast stirring component 22 and the slow stirring component 23 are started to stir the tailwater and reagent inside reactor 2, maintaining the dark reaction stage for 30 minutes. During this process, the DO sensor monitors the DO concentration in real time to ensure it is maintained below 0.5 mg / L. The denitrifying bacteria in ABGS use the carbon source to carry out the denitrification reaction, and the polyphosphate-accumulating bacteria release phosphorus. When the dark reaction ends... The concentration increased to 1.8-2.0 mg / L; S4. After the dark reaction stage ends, the control unit controls the LED light strip 7 to turn on, adjusts the ratio of red light to blue light to 4:1, and monitors the light intensity in real time by the light sensor to maintain the light reaction stage for 60-80 minutes. In S5, microalgae in ABGS photosynthesize to produce oxygen, creating an aerobic environment in reactor 2. Nitrifying bacteria oxidize ammonia nitrogen to nitrite, which then directly undergoes denitrification, shortening the nitrogen removal path and conserving carbon sources. Simultaneously, polyphosphate-accumulating bacteria utilize previously stored carbon sources and photosynthetic oxygen production to absorb excess phosphorus, achieving efficient phosphorus removal. Meanwhile, monitoring module 8 monitors DO concentration in real time and controls the DO concentration during the photocatalytic reaction stage at 1.0-2.0 mg / L by adjusting the light intensity, promoting efficient short-cut nitrification and denitrification. S6. Repeat steps 3-5 a total of n times to complete n sub-cycles of cyclic reaction. After the photo-reaction stage of the last sub-cycle ends, the control unit stops the stirring and allows the tailwater to settle in reactor 2 for 5-10 minutes. After settling, the treated tailwater supernatant is discharged through the drain pipe 4 on one side of reactor 2, completing a complete treatment cycle.

[0049] When n=4, that is, a complete treatment cycle is divided into 4 sub-cycles, each sub-cycle lasting 1.5 hours, including a 30-minute dark reaction stage and a 60-minute light reaction stage. This can ensure that the functional microorganisms can fully react while achieving high-frequency alternation of anoxic / aerobic environments, thereby enhancing the short-range nitrification and denitrification and the metabolic activity of polyphosphate-accumulating bacteria.

[0050] Example 2: Please refer to Figure 12 The specific embodiments of the present invention are as follows: Please see Figure 12 The filtration unit 5 includes a quartz sand filter layer 51, an activated carbon filter layer 52, and an ultrafiltration membrane module 53, which are an integrated composite structure.

[0051] Please see Figure 12The quartz sand filter layer 51 has a particle size of 0.5-2mm and a thickness of 30-50cm, which can trap larger flocs. The activated carbon filter layer 52 uses granular activated carbon with a particle size of 0.8-1.2mm and a thickness of 20-30cm, which can adsorb residual odors and trace organic matter in the effluent. The ultrafiltration membrane module 53 has a membrane pore size of 0.01-0.1μm and a molecular weight cutoff of 10000-50000Da, which can trap tiny algal cells, colloids and complexed algal toxins, ensuring clear effluent.

[0052] In the description of this invention, it should be understood that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0053] The control method of the present invention is through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art. The power supply is also common knowledge in the art. Therefore, the present invention will not explain the control method and circuit connection in detail.

[0054] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.

Claims

1. A marine aquaculture wastewater treatment device, comprising a pretreatment tank (1), a reactor (2) located at one end of the pretreatment tank (1), a reagent dosing unit (3) installed on the top of the reactor (2), a drain pipe (4) located on the side of the reactor (2) away from the pretreatment tank (1), a filter unit (5) located on the drain pipe (4), and a light-shielding layer (6) located on the outer wall of the reactor (2); characterized in that: The reactor (2) is equipped with an LED light strip (7) on the outside of the cylinder wall. The LED light strip (7) is a wraparound light strip and uses red and blue dual-color LED lights. The red light wavelength is 660nm and the blue light wavelength is 450nm. The inner wall of the reactor (2) is equipped with a light sensor, which is electrically connected to the LED light strip (7) through an external control unit. The reactor (2) also includes a port (21), a fast stirring assembly (22) and a slow stirring assembly (23). The port (21) is provided on the side wall of the reactor (2). The reactor (2) is provided with a fast stirring assembly (22) and a slow stirring assembly (23). The fast stirring assembly (22) and the slow stirring assembly (23) are both located at the same center as the reactor (2). The drug delivery unit (3) includes a storage tank (31), an annular tube (32) located at the bottom port of the storage tank (31), a metering pump (33) installed on the annular tube (32), and a plurality of discharge tubes (34) arrayed on the inner wall of the annular tube (32). A universal ball (35) is rotatably fitted on the plurality of discharge tubes (34), and an atomizing nozzle (36) is connected to one end of the universal ball (35) away from the discharge tube (34). The rapid stirring assembly (22) includes a motor (221), a gear (222) located at the output end of the motor (221), driven gears (223) meshing on the left and right sides of the gear (222), and a main shaft (224) located at the center end of the two driven gears (223). The two main shafts (224) are rotatably engaged with the reactor (2). A stirring element (225) is installed on each of the two main shafts (224). The two stirring elements (225) are arranged crosswise on the main shafts (224), and the distance between them is greater than half the width of a single stirring element (225). The stirring component (225) includes a stirring frame (41), several shear blades (42) disposed on both sides of the stirring frame (41), and a curved blade assembly (43) located at the center of the stirring frame (41) and connected to the main shaft (224). Each blade of the curved blade assembly (43) is provided with a hollow groove (44), and a protective ring (45) is connected to the outside of the curved blade assembly (43). The pharmaceutical formula in the storage tank (31) is as follows by weight: 15-25 parts modified zeolite powder, 10-18 parts polyaluminum chloride, 8-12 parts polyaspartic acid, 5-9 parts gallic acid, 3-7 parts sodium carboxymethyl cellulose, 2-4 parts compound probiotic agent, and 30-40 parts deionized water. The slow stirring assembly (23) includes a motor (231), a column (232) and anchor blades (233). The motor (231) is fixed to the bottom of the reactor (2). The output end of the motor (231) is connected to the column (232). Several anchor blades (233) are arranged in a ring on the column (232).

2. The marine aquaculture wastewater treatment device according to claim 1, characterized in that: The pretreatment tank (1) includes a tailwater inlet pipe (11), a bar screen (12), and an inlet pipe (13). One end of the pretreatment tank (1) is connected to the tailwater inlet pipe (11). A bar screen (12) is installed at the port of the tailwater inlet pipe (11) near the pretreatment tank (1). The other end of the pretreatment tank (1) is connected to the inlet pipe (13). The height of the inlet pipe (13) is higher than the height of the sediment inside the pretreatment tank (1) and it is an inclined structure. A solenoid valve is installed on the inlet pipe (13).

3. The marine aquaculture wastewater treatment device according to claim 2, characterized in that: The metering pump (33) has an accuracy of ±0.1 mg / L and can achieve a dosage of 1-100 mg / L. It is electrically connected to an external control unit.

4. The marine aquaculture wastewater treatment device according to claim 3, characterized in that: The inner wall of the reactor (2) is equipped with a monitoring module (8), which contains a DO sensor, a pH sensor, a COD sensor, a TIN sensor and a PO4³⁻-P sensor. Each sensor is electrically connected to the control unit.

5. A marine aquaculture wastewater treatment device according to claim 4, characterized in that: The filtration unit (5) includes a quartz sand filter layer (51), an activated carbon filter layer (52), and an ultrafiltration membrane assembly (53), wherein the quartz sand filter layer (51), the activated carbon filter layer (52), and the ultrafiltration membrane assembly (53) are an integrated composite structure.

6. A method of using a marine aquaculture wastewater treatment device, characterized in that: The method of using the marine aquaculture wastewater treatment device according to claim 5 is as follows: S1, Select marine bacteria and algae mixed sludge as inoculation sludge, put it into the main body of reactor (2), and then discharge the pre-treated and filtered aquaculture tailwater into reactor (2) through the water inlet pipe (13) in the pretreatment tank (1), and debug each module to ensure that the control unit can control the operation of each module normally and the online monitoring module data acquisition is accurate. S2, after the water intake is completed, a composite treatment agent suitable for the high-salt environment of seawater is added into the reactor (2) through the agent delivery unit (3). The agent can work synergistically with the microorganisms on ABGS to enhance the treatment effect. The formula is as follows by weight: 15-25 parts modified zeolite powder, 10-18 parts polyaluminum chloride, 8-12 parts polyaspartic acid, 5-9 parts gallic acid, 3-7 parts sodium carboxymethyl cellulose, 2-4 parts compound probiotic agent, and 30-40 parts deionized water. S3. After the agent is added, the control unit presets the treatment cycle and the duration of each sub-cycle. One treatment cycle is divided into n consecutive sub-cycles, with the number of sub-cycles n=3-5. The control unit controls the LED light strip (7) to turn off and installs the light shield (6) on the outer wall of the reactor (2). The fast stirring component (22) and the slow stirring component (23) are started to stir the tail water and agent inside the reactor (2) and maintain the dark reaction stage for 30 minutes. During this process, the DO sensor monitors the DO concentration in real time to ensure that it is maintained below 0.5mg / L. The denitrifying bacteria in ABGS use carbon sources to carry out denitrification reaction, and the polyphosphate bacteria release phosphorus. When the dark reaction ends, the PO4³⁻-P concentration rises to 1.8-2.0mg / L. S4. After the dark reaction stage ends, the control unit controls the LED light strip (7) to be turned on, and adjusts the ratio of red light to blue light to 4:

1. The light intensity is monitored in real time by the light sensor and the light reaction stage is maintained for 60-80 minutes. S5, the microalgae in ABGS perform photosynthesis to produce oxygen, which turns the reactor (2) into an aerobic environment. Nitrifying bacteria oxidize ammonia nitrogen into nitrite, and then directly carry out denitrification, shortening the denitrification path and saving carbon source. At the same time, polyphosphate bacteria use the previously stored carbon source and photosynthetic oxygen production to perform excessive phosphorus absorption, achieving efficient phosphorus removal. Meanwhile, the monitoring module (8) monitors the DO concentration in real time. By adjusting the light intensity, the DO concentration in the photoreaction stage is controlled at 1.0-2.0 mg / L, promoting efficient short-cut nitrification and denitrification. S6, repeat steps 3-5 a total of n times to complete n sub-cycles of cyclic reaction. After the photo-reaction stage of the last sub-cycle ends, the control unit controls the stirring to stop, so that the tailwater can stand and settle in the reactor (2) for 5-10 minutes. After settling, the treated tailwater supernatant is discharged through the drain pipe (4) on one side of the reactor (2) to complete a complete treatment cycle.

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