A multi-stage enhanced treatment system and method for organic pollutants in mariculture effluent

Abstract

This invention belongs to the field of water treatment, specifically a multi-stage enhanced treatment system and method for organic pollutants in marine aquaculture tailwater. It includes a pretreatment screening module, an intelligent coarse filter screen and filter mesh, and an ozone micro / nano bubble generating module, comprising an ozone generator, a Venturi jet injector, and a rotary micro / nano bubble generator. A high-efficiency ozone contact reaction module is connected to the pretreatment screening module via a pressure water pump A, and includes an annular microporous nano-aeration array, a variable frequency spiral mixer, and an open-pore sieve plate, forming a three-stage series contact oxidation unit to achieve sufficient ozone contact and enhanced reaction. This invention constructs a four-stage enhanced system through the synergistic construction of the annular microporous aeration array, variable frequency spiral mixer, staggered open-pore sieve plate, and residue purification and disinfection module of the high-efficiency ozone contact reaction module. The first to third stages are series contact oxidation stages, while the lower annular microporous aeration array provides independent aeration in different zones, achieving precise and gradient ozone dosing.

Description

Technical Field

[0001] This invention belongs to the field of water treatment, specifically a multi-stage enhanced treatment system and method for organic pollutants in marine aquaculture tailwater. Background Technology

[0002] As a major global producer of marine aquaculture, my country accounts for over 60% of the world's total marine aquaculture area and output. In 2023, my country's marine aquaculture area reached 2.074 million hectares. 2 With a production of 22.757 million tons, accounting for 65.1% of the total marine fishery output, the rapid growth of the marine aquaculture industry has also brought about serious environmental pollution problems. In particular, the severe accumulation of organic pollutants in marine aquaculture wastewater is a prominent issue. Marine aquaculture wastewater contains a large amount of unused feed residues, excrement, antibiotics, and various chemical agents, forming a complex mixture of high-concentration organic pollutants. If this wastewater is directly discharged or recycled, it can easily lead to eutrophication of surrounding waters, triggering ecological disasters such as red tides. At the same time, it increases the risk of the spread of pathogenic microorganisms and parasites, posing a continuous threat to the ecosystem of aquaculture areas and adjacent sea areas.

[0003] The salinity of marine aquaculture wastewater can reach up to 30‰. Its inherent high salinity, coupled with the large amount of organic matter generated during the aquaculture process, creates a high-salt, high-organic-matter environment that severely inhibits the effectiveness of microbial biochemical treatment technologies. Ozone, with its strong oxidizing properties and rapid reaction speed, can oxidize large organic molecules into smaller molecules or completely mineralize them without producing secondary pollution, making it an ideal means of removing organic pollutants from marine aquaculture wastewater. However, ozone has low solubility in water and is easily decomposed; its maximum solubility at 25℃ is only about 0.38 mg / L, and its half-life in the aqueous phase is only 8-30 minutes. Micro- and nano-bubble diameters are typically less than 50 μm, possessing high specific surface area and long residence time, which can significantly increase the contact area between ozone and water, making it an effective means of improving ozone mass transfer efficiency. Studies have shown that in micro- and nano-bubble systems, the gas-liquid mass transfer coefficient of ozone can reach 0.265-0.536 min- 1 This is 2-3 times higher than traditional aeration systems. However, existing devices are mostly designed for freshwater environments, neglecting the impact of high salinity on bubble generation and mass transfer efficiency. Due to increased ionic strength and decreased gas solubility in seawater, the mass transfer efficiency of ozone in seawater decreases by about 15%. Simultaneously, the calcium content in seawater... 2 At concentrations as high as 400 mg / L, the scale buildup on the microporous aeration head can reach 0.05 g / cm³. 2The ozone dosage and reaction conditions are mostly based on experience and cannot respond to water quality fluctuations in real time. This can lead to uneven aeration and reduced reaction efficiency. Therefore, it is urgent to develop an integrated, intelligent ozone micro-nano bubble enhanced treatment system and method that can be monitored and adjusted online, taking into account the characteristics of high salt content, organic load and easy scaling and corrosion in seawater.

[0004] Therefore, this invention provides a highly efficient ozone micro-nano bubble multi-stage enhanced treatment system and method for organic pollutants in marine aquaculture tailwater. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0006] The technical solution adopted by the present invention to solve its technical problem is: a multi-stage enhanced treatment system and method for organic pollutants in marine aquaculture tailwater, comprising a pretreatment screening module, including an intelligent coarse filter screen and a filter screen;

[0007] The ozone micro-nano bubble generating module includes an ozone generator, a Venturi jet generator, and a rotary shearing micro-nano bubble generator;

[0008] The high-efficiency ozone contact reaction module is connected to the pretreatment filtration module through a pressure water pump A. It includes a ring-shaped microporous nano-aeration array, a variable frequency spiral mixer and an open screen plate, forming a three-stage series contact oxidation unit to achieve full contact and enhanced reaction of ozone.

[0009] The residue purification and disinfection module is connected to the drain outlet A of the high-efficiency ozone contact reaction module. It includes an ultraviolet-ozone synergistic decomposition unit and an activated carbon adsorption protection unit, which are separated by vertically intersecting baffles to form the fourth-stage terminal treatment unit.

[0010] The intelligent control system has a data acquisition unit that collects monitoring data from each module unit in real time and constructs a closed-loop feedback adjustment mechanism.

[0011] Preferably, the pretreatment filtration module is used to remove particulate matter and suspended solids to protect subsequent microporous elements. The ozone generator is connected to the Venturi jet injector through a gas supply pipeline. The Venturi jet injector is connected to the pretreatment filtration module through a pressure water pump B to output a supersaturated ozone aqueous solution.

[0012] The rotary shearing micro-nano bubble generator is connected to a Venturi jet generator to further break up ozone bubbles and generate high-concentration ozone micro-nano bubble water.

[0013] The water intake ratio of the Venturi jet is dynamically calculated and optimized in real time by the intelligent control system based on the concentration and salinity of pollutants in the water.

[0014] Preferably, the annular microporous nano-aeration array is located at the bottom of the high-efficiency ozone contact reaction module. The annular microporous nano-aeration array is connected to the rotary-cutting micro-nano bubble generator. Above the multiple independent air supply areas are intelligent ORP monitors A, B, and C, respectively, all located on the inner wall of the high-efficiency ozone contact reaction module.

[0015] Preferably, the variable frequency spiral mixer is located in the middle of the high-efficiency ozone contact reaction module, passing through the middle of the annular microporous nano-aeration array, to generate high-intensity turbulence, extend the rising path of ozone micro-nano bubbles, and promote the collision between ozone micro-nano bubbles and pollutants. The variable frequency spiral mixer is connected to the bottom of the high-efficiency ozone contact reaction module, and the variable frequency spiral mixer has a variable frequency motor to dynamically adjust the speed according to the real-time influent flow rate, pollutant load, and dissolved ozone concentration.

[0016] Preferably, the high-efficiency ozone contact reaction module has multiple perforated screen plates to slow down the water flow and create a pressure difference between the two units, causing ozone bubbles to burst. The perforated screen plates are located above the variable frequency spiral mixer. Below the perforated screen plates are an intelligent ORP monitor B and an intelligent water quality detector B, both located on the side wall of the high-efficiency ozone contact reaction module. The high-efficiency ozone contact reaction module has an inlet A, an outlet A, and an exhaust port A. The exhaust port A is connected to the ozone generator through a gas drying compressor for ozone circulation. The ultraviolet-ozone synergistic decomposition unit is a UV-LED lamp group, and the activated carbon adsorption guarantee unit is an activated carbon packing bed. The intelligent control system has a built-in optimization algorithm model and execution drive unit to dynamically control key operating parameters. The system has a human-machine interface that can provide operating status monitoring, parameter setting, fault alarm, and historical data analysis.

[0017] Preferably, the pretreatment filtration module further includes a cleaning control component for cleaning the intelligent coarse filter screen and filter mesh, and controlling the discharge of filtered water. The cleaning control component includes a water inlet hole on one side of the inner wall of the pretreatment filtration module, a servo motor fixed to one side of the outer wall of the pretreatment filtration module, a threaded rod rotatably connected to the top of the intelligent coarse filter screen and filter mesh on the inner wall of the pretreatment filtration module, a threaded seat threaded to the outer circumference of the threaded rod, a scraper fixed to the bottom of the threaded seat, a support shaft inserted through the surface of one of the threaded seats, two inclined abutment blocks set on the top of one of the threaded rods, and an abutment block fixed to the top of one of the threaded rods. One side of one of the threaded rods passes through the inner wall of the pretreatment filtration module and is fixed to the output end of the servo motor. Both sides of the support shaft are fixed to the inner wall of the pretreatment filtration module. The abutment block is in contact with the surface of the diverter plate on the side closest to each other.

[0018] Preferably, the cleaning control component includes a movable shaft that is rotatably connected to one side of the intelligent coarse filter screen and the filter mesh, a sleeve fixed to the inner wall of the pretreatment screening module near the threaded rod, a movable shaft rotatably connected to the upper and lower ends of the sleeve, and a bevel gear fixedly sleeved on the outer circumferential surface of the threaded rod, the outer circumferential surface of the movable shaft, and the output end of the servo motor located inside the sleeve, with two adjacent bevel gears being meshed together.

[0019] Preferably, the cleaning control assembly further includes a rotating rod rotatably connected to the bottom of the inner wall of the pretreatment screening module, a pulley fixedly sleeved on the bottom of the outer circumference of one of the movable shafts and the outer circumference of the rotating rod, a connecting belt sleeved between the two pulleys, a rotating disk fixed to the top of the rotating rod, a movable frame disposed on the top of the rotating disk, a movable column inserted through the movable frame, a positioning rod inserted through and sliding at both ends of the movable frame, and a connecting strip fixed to one side of the movable frame. The bottom of the movable column is fixed to the surface of the rotating disk, and one side of the positioning rod is fixed to the inner wall of the pretreatment screening module.

[0020] A method for multi-stage enhanced treatment of organic pollutants in marine aquaculture effluent, comprising the following steps, using the aforementioned multi-stage enhanced treatment system for organic pollutants in marine aquaculture effluent:

[0021] S1: Pretreatment step: The pretreatment screening module pretreats the effluent from seawater aquaculture to remove particulate matter and suspended solids;

[0022] S2: Ozone micro-nano bubble generation steps: The ozone micro-nano bubble generation module mixes ozone with some seawater aquaculture tail water to generate high-concentration ozone micro-nano bubble water;

[0023] S3: High-efficiency ozone contact reaction step: The high-efficiency ozone contact reaction module releases ozone micro-nano bubbles and mixes with the seawater aquaculture tailwater, generating enhanced turbulent tailwater rising, and deeply removing organic pollutants from the seawater aquaculture tailwater through a multi-stage system;

[0024] S4: Residual Purification and Disinfection Steps: Use ultraviolet catalysis and activated carbon adsorption to eliminate residual organic matter and ozone in the effluent from seawater aquaculture, and perform deep sterilization.

[0025] S5: Intelligent control steps: The intelligent control system integrates the online water quality information of marine aquaculture tailwater from each module and uses optimization algorithms to dynamically adjust key operating parameters in real time.

[0026] The beneficial effects of this invention are as follows:

[0027] 1. This invention constructs a four-stage enhanced system through the synergistic construction of a high-efficiency ozone contact reaction module, a ring-shaped microporous aeration array, a variable frequency spiral mixer, staggered perforated sieve plates, and a residual purification and disinfection module. The first to third stages are series contact oxidation stages. The lower ring-shaped microporous aeration array provides independent aeration in different zones, achieving precise and gradient ozone dosing and avoiding local over- or under-aeration. The middle variable frequency spiral mixer runs through the aeration area, generating a high-intensity controllable turbulent field, promoting the collision, mixing, and reaction of ozone micro- and nano-bubbles with pollutants, and forcibly extending the upward path of ozone micro- and nano-bubbles. The top multi-layered staggered perforated sieve plates slow down the upward flow of water, increasing the effective contact time. The pressure difference between the sieve layers causes ozone bubbles to burst and release hydroxyl radicals, deeply removing recalcitrant organic matter. The fourth stage is the final deep purification and disinfection stage, which uses ultraviolet light to excite residual ozone to generate strong oxidizing free radicals, achieving deep oxidation and efficient disinfection of pollutants. The activated carbon adsorption unit thoroughly removes residual ozone and trace pollutants, ensuring the safety of the effluent.

[0028] 2. This invention utilizes a Venturi jet injector to efficiently dissolve ozone using the principle of negative pressure, generating an initial supersaturated ozone aqueous solution, significantly improving gas-liquid mixing efficiency. Combined with a rotary shearing micro / nano bubble generator, the gas-liquid mixture output from the Venturi jet injector is deeply broken down through high-speed shearing and rotary shearing actions, generating highly stable ozone micro / nano bubbles at the submicron to micron scale, greatly increasing the gas-liquid contact surface area and mass transfer driving force.

[0029] 3. This invention adds an ultrasonic anti-scaling array and a micro-pulse electrolysis anti-scaling electrode to the microporous nano-aeration head array. Through an intelligent control system, it dynamically switches between ultrasonic oscillation and pulse electrolysis modes. The shock waves and micro-jets generated by the ultrasonic waves directly impact, crush, and peel off the hard scale that has formed. At the same time, the active substances generated during the pulse electrolysis process change the local water quality conditions, inhibit the crystallization of soft scale, destroy the microbial cell structure, and kill the microorganisms that form biofilms. This achieves full coverage protection against all types of scale, including hard scale, soft scale, and biofilms, effectively alleviating the problem of aeration element clogging caused by high salinity and extending the maintenance cycle.

[0030] 4. This invention introduces an intelligent control system, which integrates real-time data such as influent salinity, hardness, pollutant load, dissolved ozone concentration, and gas phase emission, and uses an optimized algorithm model to dynamically control core parameters such as ozone dosage, aeration zone flow rate, and spiral mixer speed, to ensure that the treatment process operates under optimal conditions and achieves maximum treatment efficiency and minimum energy consumption.

[0031] 5. This invention is equipped with an ultraviolet-ozone synergistic decomposition unit, which uses ultraviolet light to activate residual dissolved ozone to generate strong oxidizing hydroxyl radicals, thereby eliminating residual organic pollutants in the system and killing pathogenic microorganisms in the effluent. This achieves deep oxidation and efficient sterilization of the effluent, thus realizing the dual purpose of residue purification and disinfection. Attached Figure Description

[0032] The invention will now be further described with reference to the accompanying drawings.

[0033] Figure 1 This is a schematic diagram of the ozone micro-nano bubble multi-stage enhancement treatment system in this invention;

[0034] Figure 2 This is a schematic diagram of the structure of the high-efficiency ozone contact reaction module in this invention;

[0035] Figure 3 This is a schematic diagram of the annular microporous aeration array in this invention;

[0036] Figure 4 This is a schematic diagram of the perforated sieve plate in this invention;

[0037] Figure 5 This is a schematic diagram of the residual purification and disinfection module in this invention;

[0038] Figure 6 This is a schematic diagram of the internal structure of the pretreatment screening module in this invention;

[0039] Figure 7 In this invention Figure 6 Enlarged schematic diagram of the structure at point A in the middle;

[0040] Figure 8 In this invention Figure 6 Enlarged schematic diagram of the structure at point B;

[0041] Figure 9 In this invention Figure 6 Enlarged schematic diagram of the structure at point C;

[0042] Figure 10 This is a flowchart of the multi-stage enhanced ozone micro-nano bubble treatment method for organic pollutants in marine aquaculture tailwater in this invention.

[0043] Figure 11 These are the COD and TOC results of the treated mariculture wastewater in Example 1 and Comparative Example 1.

[0044] In the diagram: 1. Pretreatment screening module; 102. Intelligent coarse filter screen; 103. Filter screen; 104. Water inlet; 105. Servo motor; 106. Threaded rod; 107. Threaded seat; 108. Support shaft; 109. Scraper; 110. Diverter plate; 111. Abutment block; 112. Water channel; 113. Movable shaft; 114. Sleeve frame; 115. Bevel gear; 116. Rotating rod; 117. Pulley; 118. Connecting belt 119. Rotating disc; 120. Movable frame; 121. Movable column; 122. Positioning rod; 123. Connecting strip; 124. Valve plate; 125. Connecting groove; 126. Spring telescopic rod; 127. Sealing plate; 128. Slot; 2. Pressure water pump A; 3. High-efficiency ozone contact reaction module; 31. Intelligent water quality detector A; 32. Inlet A; 33. Annular microporous nano-aeration array; 34. Variable frequency spiral mixer; 35. Ultra 36. Sonic anti-scaling array; 37. Micro pulse electrolysis anti-scaling electrode; 38. Intelligent ORP monitor A; 39. Variable frequency motor; 30. Intelligent water quality detector B; 310. Intelligent ORP monitor B; 311. Perforated sieve plate; 312. Intelligent ozone gas concentration detector; 313. Exhaust port A; 314. Drain port A; 315. Intelligent water quality detector C; 316. Intelligent ORP monitor C; 4. Residue purification and disinfection module; 41. Inlet B; 42. UV-LED lamp assembly; 43. Quartz sleeve; 44. Exhaust port B; 45. Intelligent ORP monitor D; 46. Activated carbon packing bed; 47. Drain port B; 48. Intelligent water quality detector D; 49. Intelligent ORP monitor E; 5. Pressure water pump B; 6. Ozone generator; 7. Venturi jet injector; 8. Rotary shearing micro-nano bubble generator; 9. Gas drying compressor; 10. Intelligent control system. Detailed Implementation

[0045] 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.

[0046] Example 1:

[0047] Figure 1 A structural diagram of a multi-stage ozone micro / nano bubble enhancement system provided in an embodiment of the present invention is shown below. Figure 1 As shown, the ozone micro / nano bubble multi-stage enhancement treatment system includes:

[0048] The pretreatment screening module 1 includes an intelligent coarse filter grid 101 and a filter screen 102;

[0049] The ozone micro-nano bubble generating module includes an ozone generator 6, a Venturi jet generator 7, and a rotary shearing micro-nano bubble generator 8;

[0050] The high-efficiency ozone contact reaction module 3 is connected to the pretreatment filtration module 1 via a pressure water pump A2. It includes an annular microporous nano aeration array 33, a variable frequency spiral mixer 34, and an open sieve plate 311, forming a three-stage series contact oxidation unit to achieve full contact and enhanced reaction of ozone.

[0051] The residue purification and disinfection module 4 is connected to the drain outlet A314 of the high-efficiency ozone contact reaction module 3. It includes an ultraviolet-ozone synergistic decomposition unit and an activated carbon adsorption protection unit, which are separated by vertically intersecting baffles to form the fourth-stage terminal treatment unit.

[0052] The intelligent control system 10 has a data acquisition unit that collects monitoring data from each module unit in real time and constructs a closed-loop feedback adjustment mechanism.

[0053] To facilitate further understanding, the following will be combined with... Figures 1 to 5 The above modules will be explained in detail;

[0054] The pretreatment sieve module 1 is used to remove particulate matter and suspended solids to protect subsequent microporous elements.

[0055] Ozone generator 6 is connected to Venturi jet 7 via a gas supply pipeline. Venturi jet 7 is connected to pretreatment filtration module 1 via pressure water pump B7, and outputs supersaturated ozone aqueous solution.

[0056] The rotary micro-nano bubble generator 8 is connected to the Venturi jet generator 7 to further break up ozone bubbles and generate high-concentration ozone micro-nano bubble water.

[0057] The water intake ratio of the Venturi jet 7 is dynamically calculated and optimized in real time by the intelligent control system based on the concentration and salinity of pollutants in the water.

[0058] like Figure 2 As shown, the annular microporous nano-aeration array 33 is located at the bottom of the high-efficiency ozone contact reaction module, and the annular microporous nano-aeration array 33 is connected to the rotary-cut micro-nano bubble generator.

[0059] like Figure 3 As shown, the annular microporous nano-aeration array 33 is 55% to 90% of the reactor's inner diameter. The annular microporous nano-aeration array 33 is divided into multiple independent air supply zones. Based on the feedback data from the intelligent ORP monitor A37, the flow rate of ozone micro-nano bubbles in the multiple independent air supply zones is intelligently adjusted.

[0060] Furthermore, the number of multiple independent air supply zones is 2 to 8. Each of the multiple independent air supply zones has an ultrasonic anti-scaling array 35 and a micro pulse electrolysis anti-scaling electrode 36 at its bottom. The ultrasonic anti-scaling array 35 and the micro pulse electrolysis anti-scaling electrode 36 are connected to an intelligent control system. Based on the online monitoring data of influent salinity and hardness, the system can intelligently switch or combine the use of ultrasonic oscillation and pulse electrolysis to achieve full coverage protection against all types of scale.

[0061] Furthermore, the ultrasonic anti-scaling array 35 has an ultrasonic frequency of 15 to 55 kHz, and the micro-pulse electrolytic anti-scaling electrode 36 has a voltage range of 5 to 30 V.

[0062] Furthermore, each of the multiple independent gas supply areas is equipped with a smart ORP monitor A37, a smart ORP monitor B310, and a smart ORP monitor C316, all located on the inner wall of the high-efficiency ozone contact reaction module.

[0063] Furthermore, the variable frequency spiral mixer 34 is located in the middle of the high-efficiency ozone contact reaction module, passing through the middle of the annular microporous nano-aeration array 33, and is used to generate high-intensity turbulence, extend the rising path of ozone micro-nano bubbles, and promote the collision between ozone micro-nano bubbles and pollutants. The variable frequency spiral mixer 34 is connected to the bottom of the high-efficiency ozone contact reaction module 3. The variable frequency spiral mixer 34 has a variable frequency motor 38, which is used to dynamically adjust the speed according to the real-time influent flow rate, pollutant load, and dissolved ozone concentration.

[0064] Furthermore, the blade diameter of the variable frequency screw mixer 34 is 20% to 70% of the reactor diameter; the speed adjustment range of the variable frequency screw mixer 34 is 50 to 1500 rpm;

[0065] Furthermore, the high-efficiency ozone contact reaction module 3 has multiple perforated screen plates 311, which are used to slow down the water flow rate and create a pressure difference between the two units, causing the ozone bubbles to burst. The perforated screen plates 311 are located above the variable frequency spiral mixer 34. Below the perforated screen plates 311 are an intelligent ORP monitor B310 and an intelligent water quality detector B39, both located on the side wall of the high-efficiency ozone contact reaction module.

[0066] like Figure 4 As shown, the material of the perforated sieve plate 311 includes stainless steel or polytetrafluoroethylene, the perforation rate of the perforated sieve plate 311 is 25% to 50%, the number of perforated sieve plates 311 is 2 to 5, and the perforated sieve plates 311 are arranged in an alternating pattern.

[0067] Furthermore, the high-efficiency ozone contact reaction module 3 has an inlet A32, an outlet A314, and an exhaust outlet A313;

[0068] Furthermore, the inlet A32 is located on the lower side wall of the high-efficiency ozone contact reaction module 3 and below the annular microporous nano aeration array 33. The inlet A32 is externally connected to the intelligent water quality detector A31, and the inlet A33 is connected to the rotary shearing micro-nano bubble generator 8.

[0069] Furthermore, the drain outlet A314 is located on the upper side wall of the high-efficiency ozone contact reaction module and above the perforated sieve plate 311. The drain outlet A314 is externally connected to the intelligent ORP monitor C316 and the intelligent water quality detector C315.

[0070] Furthermore, the exhaust port A313 is located on the top of the high-efficiency ozone contact reaction module 3. Next to the exhaust port A313 is an intelligent ozone gas concentration detector 312. The exhaust port A313 is connected to the ozone generator 6 through the gas drying compressor 9 for ozone circulation.

[0071] like Figure 5 As shown, the UV-ozone synergistic decomposition unit is a UV-LED lamp group 42, which is used to activate residual dissolved ozone with ultraviolet light to generate strong oxidizing free radicals, and simultaneously carry out deep oxidation of residual pollutants, efficient sterilization and disinfection and consumption of residual ozone, so as to ensure the safety of the effluent water quality. The top of the UV-ozone synergistic decomposition unit has an exhaust port B44.

[0072] Furthermore, the wavelength of the UV-LED lamp assembly 42 is 200~300 nm, the number of UV-LED lamp assemblies 42 is 2 to 10, the UV-LED lamp assembly 42 is placed in a detachable quartz sleeve 43 to protect the UV-LED lamp assembly 42 and facilitate lamp assembly replacement. When scale is detected on the surface of the sleeve, the internal cleaning program can be started. The cleaning process includes mechanical scraping and hydraulic backwashing.

[0073] Furthermore, the activated carbon adsorption protection unit is an activated carbon packing bed 46, which is used to adsorb residual ozone and incompletely removed pollutants in the effluent. The activated carbon adsorption protection unit is connected to the intelligent ORP monitor E49 and the intelligent water quality detector D48.

[0074] Furthermore, the activated carbon adsorption protection unit has an activated carbon packing bed 46, which facilitates the replacement of activated carbon packing in layers. The number of activated carbon packing beds 46 is 1 to 6.

[0075] The intelligent control system 10 has a built-in optimization algorithm model and execution drive unit to dynamically adjust key operating parameters. The system has a human-machine interface and can provide operation status monitoring, parameter setting, fault alarm and historical data analysis.

[0076] Example 2:

[0077] like Figures 6 to 9As shown in Example 1, another embodiment of the present invention is as follows:

[0078] The pretreatment screening module 1 also includes a cleaning control component for cleaning the intelligent coarse filter screen 101 and the filter screen 102, and controlling the discharge of filtered water;

[0079] The cleaning control component includes an inlet hole 104 on one side of the inner wall of the pretreatment filter module 1, a servo motor 105 fixed on one side of the outer wall of the pretreatment filter module 1, a threaded rod 106 rotatably connected to the inner wall of the pretreatment filter module 1 at the top of the intelligent coarse filter grid 101 and the filter screen 102, a threaded seat 107 threaded to the outer circumferential surface of the threaded rod 106, a scraper 109 fixed to the bottom of the threaded seat 107, a support shaft 108 inserted through the surface of one of the threaded seats 107, two inclined 102s set on the top of one of the threaded rods 106, and an abutment block 111 fixed on the top of one of the threaded rods 106. One side of one of the threaded rods 106 passes through the inner wall of the pretreatment filter module 1 and is fixed to the output end of the servo motor 105. Both sides of the support shaft 108 are fixed to the inner wall of the pretreatment filter module 1. The abutment block 111 is in contact with the surface of the diverter plate 110 on the side closest to each other.

[0080] Since the intelligent coarse filter grille 101 and filter screen 102 are prone to clogging during long-term use, the cleaning control component can scrape and clean the surfaces of the intelligent coarse filter grille 101 and filter screen 102 to prevent clogging.

[0081] By rotating the two threaded rods 106, one threaded seat 107 is supported and limited by the support shaft 108, and the other threaded seat 107 is limited by the contact block 111 and the two diverter plates 110. This allows the two threaded seats 107 to slide only in the horizontal direction. Under the meshing action between the threaded seat 107 and the threaded rod 106, the scraper 109 can be driven to move in the horizontal direction. This causes friction cleaning between the scraper 108 and the intelligent coarse filter screen 101 and the filter screen 102, pushing the impurities accumulated on the top of the intelligent coarse filter screen 101 and the filter screen 102 to one side, thereby ensuring the filtration effect of the intelligent coarse filter screen 101 and the filter screen 102.

[0082] The cleaning control component includes a movable shaft 113 that is rotatably connected to one side of the intelligent coarse filter screen 101 and the filter screen 102, a sleeve frame 114 fixed to the inner wall of the pretreatment screening module 1 near the threaded rod 106, a movable shaft 113 rotatably connected to the upper and lower ends of the sleeve frame 114, and a bevel gear 115 fixedly sleeved on the outer circumferential surface of the threaded rod 106, the outer circumferential surface of the movable shaft 113, and the output end of the servo motor 105 located inside the sleeve frame 114. Two adjacent bevel gears 115 are meshed together.

[0083] When the servo motor 105 is started, the meshing action between adjacent bevel gears 115 causes one threaded rod 106 and one movable shaft 113 to rotate, thereby driving the bevel gear 115 on the surface of the movable shaft 113 to rotate. Under the meshing action of the remaining bevel gears 115, the other threaded rod 106 and the movable shaft 113 can rotate accordingly. When the servo motor 105 drives the two scrapers 109 to rotate, the output end of the servo motor 105 needs to rotate alternately in clockwise and counterclockwise directions so that the scrapers 109 can reciprocate in the horizontal direction, thereby further improving the cleaning effect of the scrapers 109 and preventing the scrapers 109 from always contacting the inner wall of the pretreatment screening module 1.

[0084] The cleaning control assembly also includes a rotating rod 116 rotatably connected to the bottom of the inner wall of the pretreatment screening module 1, a pulley 117 fixedly sleeved on the bottom of the outer peripheral surface of one of the movable shafts 113 and the outer peripheral surface of the rotating rod 116, a connecting belt 118 sleeved between the two pulleys 117, a rotating disk 119 fixed to the top of the rotating rod 116, a movable frame 120 set on the top of the rotating disk 119, a movable column 121 inserted through the movable frame 120, a positioning rod 122 inserted through and sliding at both ends of the movable frame 120, and a connecting strip 123 fixed to one side of the movable frame 120. The bottom of the movable column 121 is fixed to the surface of the rotating disk 119, and one side of the positioning rod 122 is fixed to the inner wall of the pretreatment screening module 1.

[0085] When the movable shaft 113 rotates, the rotating rod 116 rotates due to the connection between the pulley 117 and the connecting belt 118, which in turn causes the rotating disk 119 to rotate and drive the movable column 121 to make circular motion. As a result, the movable column 121 abuts against the movable frame 120 and the positioning rod 122 limits the movable frame 120, allowing the movable frame 120 and the connecting bar 123 to reciprocate in the horizontal direction.

[0086] The cleaning control assembly also includes a water trough 112 at the bottom of the pretreatment filtration module 1, slots 128 connecting both sides of the water trough 112, a valve plate 124 slidably inserted between the water trough 112 and the slots 128, a connecting groove 125 connecting the top of the slots 128, a plurality of spring telescopic rods 126 fixed inside the connecting grooves 125, and a sealing plate 127 fixed to the bottom of the spring telescopic rods 126. The bottom of the connecting bar 123 is fixed to the middle position of the valve plate 124.

[0087] When the connecting bar 123 drives the valve plate 124 to reciprocate in the horizontal direction, it can alternately extend into the depth of the inner cavity of the two slots 128. When the connecting bar 123 abuts against one side of the inner wall of one of the water channels 112, it can open the water channel 112, allowing water to drain out of the water channel 112. When the connecting bar 123 is in the middle position of the water channel 112, it can close the water channel 112, preventing water from draining out of the water channel 112. When the connecting bar 123 abuts against the inner wall of the water channel 112, the sealing plate 127 away from the abutting side can close the slot 128 away from the abutting side under the action of the spring telescopic rod 126. The sealing plate 127 close to the abutting side can be embedded into the interior of the adjacent connecting groove 125 by the abutting action of the valve plate 124, thereby preventing water from flowing downward from the gap between the slot 128 and the valve plate 124.

[0088] Figure 10 This invention provides a multi-stage enhanced ozone micro-nano bubble treatment method for organic pollutants in marine aquaculture wastewater. The method can employ the aforementioned multi-stage enhanced ozone micro-nano bubble treatment system and includes:

[0089] S1: Pretreatment steps: Pretreatment screening module 1 pretreatments the effluent from marine aquaculture to remove particulate matter and suspended solids;

[0090] S2: Ozone micro-nano bubble generation step: The ozone micro-nano bubble generation module mixes ozone with some seawater aquaculture tailwater to generate high-concentration ozone micro-nano bubble water.

[0091] S3: High-efficiency ozone contact reaction step: The high-efficiency ozone contact reaction module 3 releases ozone micro-nano bubbles, which mix with the seawater aquaculture tailwater to generate enhanced turbulent tailwater rising. Through a multi-stage system, organic pollutants in the seawater aquaculture tailwater are deeply removed.

[0092] S4: Residual Purification and Disinfection Steps: Use ultraviolet catalysis and activated carbon adsorption to eliminate residual organic matter and ozone in the effluent from seawater aquaculture, and perform deep sterilization.

[0093] S5: Intelligent control steps: The intelligent control system 10 integrates the online water quality information of the effluent from various modules of seawater aquaculture and uses optimization algorithms to dynamically adjust key operating parameters in real time.

[0094] To facilitate further understanding, the above steps will be explained in detail below with an example:

[0095] S1: Preprocessing steps:

[0096] The wastewater from marine aquaculture enters the pretreatment screening module 1, where particulate matter and suspended solids are removed by the intelligent coarse filter screen 102 and filter screen 103.

[0097] S2: Steps for generating ozone micro / nano bubbles:

[0098] A portion of the pretreated marine aquaculture wastewater is pumped into the Venturi jet 7 via the pressure pump B5, where it is efficiently mixed with ozone generated by the ozone generator 6 to form a supersaturated ozone solution.

[0099] It then enters the rotary shearing micro-nano bubble generator 8, where it is broken down by high-speed shearing to generate ozone micro-nano bubble water with high concentration, small particle size, and high stability.

[0100] S3: High-efficiency ozone contact reaction steps

[0101] The remaining seawater aquaculture tailwater after pretreatment enters the high-efficiency ozone contact reaction module 3 from the bottom inlet of the module, and is fully mixed with ozone micro-nano bubbles released from the annular microporous nano aeration array 33.

[0102] The mixture rises under the enhanced turbulence generated by the variable frequency spiral mixer 34, and organic pollutants are gradually degraded.

[0103] As the wastewater from marine aquaculture continues to rise, its flow rate slows down after passing through multiple perforated 311 sieves. Some ozone bubbles burst and release free radicals, achieving deep removal of recalcitrant organic matter.

[0104] S4: Residue purification and disinfection steps

[0105] After the high-efficiency ozone contact reaction step, the effluent from seawater aquaculture enters the residue purification and disinfection module 4, where it undergoes catalytic decomposition of residual ozone and organic matter and deep sterilization by the ultraviolet-ozone synergistic decomposition unit.

[0106] After treatment, the effluent from marine aquaculture continues to be adsorbed by activated carbon adsorption units to remove trace amounts of ozone and residual organic matter, ultimately meeting the discharge or reuse standards.

[0107] S5: Intelligent Control Steps

[0108] The intelligent control system 10 integrates online monitoring data such as salinity, pollutant load, ozone concentration, and effluent quality of the marine aquaculture tailwater from various modules. It uses optimization algorithms to dynamically adjust key operating parameters in real time, enabling the system to operate efficiently, stably, and with low energy consumption under different loads and water quality conditions.

[0109] The ozone micro-nano bubble multi-stage enhanced treatment system in this embodiment is used to treat marine aquaculture wastewater. The ozone generator in this system provides an ozone concentration of 15 mg / L and an aeration rate of 100 mL / min. The residence time of the marine aquaculture wastewater in the high-efficiency ozone contact reaction module is 12 min. The annular microporous nano-aeration array preferably has 4 independent aeration zones. The number of perforated sieve plates is preferably 3, and the material is preferably stainless steel. The wavelength of the UV-LED lamp group is preferably 254 nm.

[0110] Comparative Example 1:

[0111] The difference between this comparative example and the embodiment is that the ozone micro-nano bubble generating module does not include a Venturi jet and a rotary shearing micro-nano bubble generator, and the high-efficiency ozone contact reaction module does not include a ring-shaped microporous nano-aeration array. The ozone generated by the ozone generator is directly introduced into the high-efficiency ozone contact reaction module, and aeration is performed using a common aeration head available on the market.

[0112] The treatment effects of the systems in Example 1 and Comparative Example 1 on COD and TOC in marine aquaculture wastewater were compared, and the results are as follows: Figure 11 As shown;

[0113] from Figure 11 It can be seen that after treatment using the ozone micro-nano bubble multi-stage enhanced treatment system of this embodiment, the COD and TOC concentrations of the marine aquaculture effluent decreased by 43.2% and 44.5%, respectively. The treatment effect is better than that of the conventional aeration system in the comparison. This indicates that the micro-nano bubbles generated by the combination of the Venturi jet, the rotary shearing micro-nano bubble generator and the annular microporous nano aeration array in this system fully improve the solubility and mass transfer efficiency of ozone, and promote the improvement of the treatment effect of organic pollutants in marine aquaculture effluent by this system.

[0114] The terms "front," "back," "left," "right," "top," and "bottom" all refer to the figures in the accompanying drawings. Figure 1 Based on the perspective of the observer, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0115] In the description of this invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this invention.

[0116] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multi-stage enhanced treatment system for organic pollutants in mariculture effluent, characterized in that: It includes a pretreatment screening module (1), which includes an intelligent coarse filter grid (102) and a filter screen (103). The ozone micro-nano bubble generating module includes an ozone generator (6), a Venturi jet generator (7), and a rotary shearing micro-nano bubble generator (8). The high-efficiency ozone contact reaction module (3) is connected to the pretreatment sieve module (1) through the pressure water pump A (2). It includes a ring microporous nano aeration array (33), a variable frequency spiral mixer (34) and an open sieve plate (311), forming a three-stage series contact oxidation unit to achieve full contact and enhanced reaction of ozone. The residual purification and disinfection module (4) is connected to the drain outlet A (314) of the high-efficiency ozone contact reaction module (3), including an ultraviolet-ozone synergistic decomposition unit and an activated carbon adsorption protection unit, which are separated by vertically intersecting baffles to form the terminal fourth-level treatment unit; The intelligent control system (10) has a data acquisition unit that collects monitoring data from each module unit in real time and constructs a closed-loop feedback regulation mechanism. The annular microporous nano-aeration array (33) is located at the bottom of the high-efficiency ozone contact reaction module and is divided into multiple independent air supply areas. Each of the multiple independent air supply areas has an ultrasonic anti-scaling array (35) and a micro-pulse electrolysis anti-scaling electrode (36) at its bottom. The ultrasonic anti-scaling array (35) and the micro-pulse electrolysis anti-scaling electrode (36) are connected to an intelligent control system. Based on the online monitoring data of influent salinity and hardness, the system can intelligently switch or combine ultrasonic oscillation and pulse electrolysis to achieve full coverage protection against scale types. The annular microporous nano-aeration array (33) is connected to a rotary micro-nano bubble generator. Above the multiple independent air supply areas are intelligent ORP monitors A (37), B (310), and C (316), all located on the inner wall of the high-efficiency ozone contact reaction module. The variable frequency spiral mixer (34) is located in the middle of the high-efficiency ozone contact reaction module and passes through the middle of the annular microporous nano-aeration array (33). It is used to generate high-intensity turbulence, extend the rising path of ozone micro-nano bubbles, and promote the collision between ozone micro-nano bubbles and pollutants. The variable frequency spiral mixer (34) is connected to the bottom of the high-efficiency ozone contact reaction module (3). The variable frequency spiral mixer (34) has a variable frequency motor (38) for dynamically adjusting the speed according to the real-time influent flow rate, pollutant load, and dissolved ozone concentration. The high-efficiency ozone contact reaction module (3) has multiple perforated screen plates (311) to slow down the water flow and create a pressure difference between the two units, causing the ozone bubbles to burst. The perforated screen plates (311) are located above the variable frequency spiral mixer (34). The pretreatment filtration module (1) is used to remove particulate matter and suspended matter to protect subsequent microporous elements. The ozone generator (6) is connected to the Venturi jet (7) through a gas supply pipeline. The Venturi jet (7) is connected to the pretreatment filtration module (1) through a pressure water pump B (5) to output a supersaturated ozone aqueous solution. The rotary shearing micro-nano bubble generator (8) is connected to the Venturi jet generator (7) for further breaking up ozone bubbles to generate high-concentration ozone micro-nano bubble water; The water intake ratio of the Venturi jet (7) is dynamically calculated and optimized in real time by the intelligent control system based on the concentration and salinity of pollutants in the water.

2. The multi-stage enhanced treatment system for organic pollutants in the tail water of a marine culture according to claim 1, characterized in that: Below the perforated sieve plate (311) are a smart ORP monitor B (310) and a smart water quality detector B (39), both located on the side wall of the high-efficiency ozone contact reaction module. The high-efficiency ozone contact reaction module (3) has an inlet A (32), an outlet A (314) and an exhaust outlet A (313). The exhaust outlet A (313) is connected to the ozone generator (6) through a gas drying compressor (9) for ozone circulation. The UV-ozone synergistic decomposition unit is a UV-LED lamp group (42), the activated carbon adsorption guarantee unit is an activated carbon packing bed (46), the intelligent control system (10) has a built-in optimization algorithm model and execution drive unit to dynamically control key operating parameters, the system has a human-machine interface, and can provide operating status monitoring, parameter setting, fault alarm and historical data analysis.

3. A multi-stage enhanced treatment method of organic pollutants in mariculture effluent, the method using a multi-stage enhanced treatment system of organic pollutants in mariculture effluent according to claim 2, characterized in that, Includes the following steps: S1: Pretreatment steps: Pretreatment screening module (1) pretreatments the effluent from marine aquaculture to remove particulate matter and suspended solids; S2: Ozone micro-nano bubble generation steps: The ozone micro-nano bubble generation module mixes ozone with some seawater aquaculture tail water to generate high-concentration ozone micro-nano bubble water; S3: High-efficiency ozone contact reaction step: The high-efficiency ozone contact reaction module (3) releases ozone micro-nano bubbles and mixes them with the seawater aquaculture tailwater to generate enhanced turbulent tailwater rising, and deep removal of organic pollutants in the seawater aquaculture tailwater through a multi-stage system. S4: Residual Purification and Disinfection Steps: Use ultraviolet catalysis and activated carbon adsorption to eliminate residual organic matter and ozone in the effluent from seawater aquaculture, and perform deep sterilization. S5: Intelligent control steps: The intelligent control system (10) integrates the online water quality of the marine aquaculture tailwater of each module and uses optimization algorithms to dynamically adjust key operating parameters in real time.

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