Treatment device for breeding tail water containing microplastics and antibiotics

Abstract

The invention relates to the technical field of tail water treatment systems, and discloses a treatment device for breeding tail water containing micro-plastics and antibiotics, the treatment device comprises a bottom plate, a material injection mechanism is arranged on the bottom plate, a preliminary filtering mechanism is connected to the material injection mechanism, a micro-plastic treatment mechanism is connected to the tail end of the material injection mechanism, and the micro-plastic treatment mechanism is connected to the tail end of the preliminary filtering mechanism. When breeding tail water enters a preliminary filtering mechanism through a water injection cylinder, a rotating cylinder is driven to rotate under the impact action of a driving plate and water flow, a hemispherical block continuously knocks a filtering plate, and in combination with the vibration action of a filtering plate spring, suspended particulate matter, residual feed and other impurities are effectively prevented from blocking a filtering net; the filter residues are automatically guided into the collecting box, automatic cleaning and efficient operation in the filtering process are achieved, the device is particularly suitable for aquaculture tail water with the high suspended matter content, the pretreatment efficiency can be remarkably improved, and stable operation of a follow-up treatment unit is guaranteed.

Description

Technical Field

[0001] This invention belongs to the technical field of wastewater treatment systems, specifically a treatment device for aquaculture wastewater containing microplastics and antibiotics. Background Technology

[0002] As the world's largest aquaculture nation, my country's annual aquaculture output has exceeded 60 million tons for over 20 consecutive years, accounting for more than 60% of global production, providing crucial support for ensuring food security and people's livelihoods. However, with the industry's large-scale and intensive development, wastewater pollution has become increasingly prominent, becoming a core bottleneck restricting the sustainable development of aquaculture. According to the latest data from the "China Fisheries Ecological Environment Status Bulletin," in 2024, nearly 30% of the wastewater from key monitored aquaculture areas nationwide failed to meet the "Freshwater Pond Aquaculture Wastewater Discharge Requirements" (GB 3838-2002) standard. Among these, the exceedance rate of wastewater from factory farming and high-density pond farming was as high as 45%, with the problem of compound pollution from four types of characteristic pollutants being particularly prominent. First, there is microplastic pollution. Sources include plastic films used in aquaculture, aging and shedding of feeder parts, and formulated feeds containing microplastic additives. Microplastic particles in the effluent are mostly concentrated between 0.1-5 mm in size, with some nano-sized microplastics (<100 nm) capable of penetrating the cell membranes of farmed organisms. The enrichment rate in fish livers and muscles exceeds 85%, and these microplastics are passed down through the food chain to humans, potentially causing organ damage and metabolic disorders with long-term ingestion. Second, there are antibiotic residues. To control bacterial diseases, antibiotics such as florfenicol, enrofloxacin, and oxytetracycline are commonly used in aquaculture. Some farms use these antibiotics in excessive amounts or beyond permitted limits, resulting in antibiotic concentrations in the effluent generally exceeding 100 ng / L, with some reaching as high as 500 ng / L, far exceeding the safe water threshold. Third, there is the spread of resistance genes. The long-term overuse of antibiotics induces bacteria in water bodies to produce resistance genes. Related surveys show that the detection rate of resistance genes in aquaculture wastewater exceeds 60%, with tetracycline and fluoroquinolone resistance genes having the highest abundance. These genes can spread to natural water bodies through water flow and biological migration, posing a potential threat to public health and safety. Fourth, there is the problem of eutrophication. The accumulation of uneaten feed and aquaculture excrement in water bodies leads to total nitrogen concentrations in wastewater often reaching 10-20 mg / L and total phosphorus concentrations reaching 1-3 mg / L, which are 5-10 times and 10-30 times the Class III surface water standard, respectively. After large amounts of nitrogen and phosphorus are discharged into natural water bodies, they can easily cause algal blooms, a sharp drop in dissolved oxygen, and even induce red tides and algal blooms, disrupting the aquatic ecological balance.

[0003] Currently, most aquaculture wastewater treatment technologies have significant limitations: traditional physical filtration equipment can only remove large particulate impurities and is insufficient for removing small molecule pollutants such as microplastics and antibiotics; while single biological treatment technologies can alleviate eutrophication, their ability to remove resistant genes and microplastics is limited; and although chemical oxidation methods can degrade antibiotics, they are prone to secondary pollution and cannot simultaneously address multiple types of pollution. Therefore, developing an integrated device capable of simultaneously treating these multiple pollutants is both an urgent practical need and of significant environmental value. Summary of the Invention

[0004] In view of the above situation and to overcome the defects of the prior art, the present invention provides a treatment device for aquaculture wastewater containing microplastics and antibiotics, which effectively solves the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a treatment device for aquaculture wastewater containing microplastics and antibiotics, comprising a base plate, a feeding mechanism on the base plate, a preliminary filtration mechanism connected to the feeding mechanism, a microplastic treatment mechanism connected to the end of the feeding mechanism, an eutrophic wastewater treatment mechanism connected below the microplastic treatment mechanism to treat traditional inorganic phosphorus and inorganic nitrogen pollution, a deep purification mechanism connected below the eutrophic wastewater treatment mechanism, a disinfection mechanism connected below the deep purification mechanism, and a discharge mechanism connected below the disinfection mechanism; The feeding mechanism is used to inject aquaculture wastewater; the preliminary filtration mechanism is used to filter and intercept suspended particles, uneaten feed, plant debris, etc. in the wastewater to prevent clogging of the subsequent purification zone; the microplastic treatment mechanism is used to remove microplastics from the wastewater; the eutrophic wastewater treatment mechanism is used to remove nutrients from the wastewater; the deep purification mechanism is used to perform deep purification and filtration of the wastewater; the disinfection mechanism is used to perform final disinfection of the wastewater; and the discharge mechanism is used to discharge the wastewater.

[0006] Preferably, the test injection mechanism includes a water injection cylinder frame mounted on the base plate, a water injection cylinder mounted on the water injection cylinder frame, a water injection pipe connected to one end of the lower part of the water injection cylinder, an injection pump connected to the other end of the water injection pipe, the injection pump mounted on the top of the treatment tank, a plurality of support legs mounted on the lower part of the treatment tank, the support legs welded to the base plate, and the water injection pipe mounted on the base plate by a locking assembly; The locking assembly includes a third partition channel for the support platform, a third partition channel for the locking clamp, and a third partition channel for the bolt. The third partition channel for the support platform is mounted on the base plate. The water injection pipe is locked onto the third partition channel for the support platform through the third partition channel for the locking clamp and the third partition channel for the bolt.

[0007] Preferably, the preliminary filtration mechanism includes a collection box mounted on the water injection cylinder, a filter plate slidably connected to the inner end wall of the water injection cylinder, a plurality of filter plate spring seats mounted on the inner end wall of the water injection cylinder, a filter plate spring connected to the upper part of the filter plate spring seat, the filter plate spring connected to the filter plate, a drive shaft rotatably connected through the water injection cylinder below the filter plate, a rotating cylinder fixedly mounted on the outer surface of the drive shaft, a plurality of drive plates uniformly fixedly connected to the outer surface of the rotating cylinder, a plurality of fixed cylinders uniformly fixedly mounted on the outer surface of the rotating cylinder between adjacent drive plates, a sliding rod slidably connected inside the fixed cylinder, a hemispherical block fixedly connected to the outer end of the sliding rod, a striking spring connected between the sliding rod and the inner bottom wall of the fixed cylinder, the hemispherical block striking the bottom of the filter plate, one end of the drive shaft extending into a transmission box, the transmission box being fixedly mounted on the water injection cylinder and connected to the collection box. The transmission box is connected in the following ways: a drive pulley is fixedly connected to the end of the drive shaft; the drive pulley and the driven pulley are connected by a belt for transmission; the driven pulley is fixedly installed at the end of the pulley shaft; the pulley shaft is rotatably installed in the transmission box; a drive incomplete gear is fixedly connected to the outer surface of the pulley shaft; the drive incomplete gear meshes with a transmission gear; the transmission gear is fixedly installed at the end of the incomplete gear shaft; the incomplete gear shaft is rotatably installed in the transmission box; a release gear is fixedly installed on the outer surface of the incomplete gear shaft; the release gear is rotatably installed through the transmission box and extends into the collection box; a filter collection channel is provided on the water injection cylinder; the filter collection channel connects the water injection cylinder and the collection box; the release gear extends into the filter collection channel; a baffle is fixedly installed on the outer surface of the release gear in the filter collection channel; and a torsion spring connects the release gear and the collection box. The filter collection channel is located on the upper side of the filter plate and close to the filter plate. The baffle is slidably connected to the end wall of the filter collection channel and is sealed. The bottom wall of the filter collection channel is inclined at a certain angle and tilted towards the collection box. The filter plate is tilted at a certain angle, with the center line of the filter plate recessed downwards and the sides protruding, so that the center line forms a V-shaped groove, which facilitates the smooth entry of the filtered residue into the filter collection channel. The incomplete gear shaft is rotatably mounted on the collection box and has a certain amount of friction to prevent free rotation.

[0008] Preferably, the microplastic treatment mechanism includes a filter frame uniformly fixedly installed inside the treatment tank. From top to bottom, the filter frame is filled with a composite adsorbent material consisting of a plastic wood-based filter material, modified volcanic rock, modified activated carbon, and diatomaceous earth. A stirring shaft is rotatably connected through the middle of the filter frame. The top of the stirring shaft is rotatably connected to a crossbeam. The crossbeam is fixedly installed on the treatment tank. A driven stirring pulley shaft is rotatably connected inside the crossbeam. The driven stirring pulley shaft is fixedly connected to the stirring shaft. A driven stirring pulley is fixedly installed on the outer surface of the driven stirring pulley shaft. The driven stirring pulley and the driving stirring pulley are connected and driven by a stirring belt. The driving stirring pulley is fixedly installed on the outer surface of the driving stirring pulley shaft, and the driving stirring pulley shaft is rotatably installed on the crossbeam. The stirring drive pulley shaft is poweredly connected to the stirring motor fixedly installed on the cross frame outside the processing tank. An extraction frame is fixedly connected to the stirring shaft. The extraction frame has an extraction chamber inside, which communicates with the hollow section inside the stirring shaft. The extraction frame contacts the upper surface of the filter screen frame. Several extraction channels are provided through the bottom wall of the extraction chamber. Pressure valves are installed between the end walls of the extraction channels. A cylinder is rotatably connected to the outer surface of the stirring shaft. The cylinder is connected to the hollow section through several connecting holes provided through the end wall of the hollow section. One end of the extraction tube is connected to the cylinder. The other end of the extraction tube communicates with the inside of the collection tank. The collection tank is installed outside the processing tank by a mounting bracket. A vacuum pump is installed on the collection tank. A discharge valve is provided at the bottom of the collection tank.

[0009] Preferably, the treatment tank is equipped with an antibiotic treatment mechanism located below the microplastic treatment mechanism. The antibiotic treatment mechanism includes a protective shell uniformly and fixedly installed on the inner surface of the treatment tank. A cleaning nozzle is installed inside the protective shell. A plurality of stirring rods are uniformly and rotatably connected to the outer surface of the stirring shaft below the filter frame. Stirring plates are uniformly and fixedly installed on the outer surface of the stirring rods. An oxidizer supply tank is fixedly installed on the outer surface of the treatment tank. An oxidizer supply nozzle is fixedly connected to the inner end wall of the treatment tank. An oxidizer supply valve is connected between the oxidizer supply nozzle and the oxidizer supply tank. Several antibiotic treatment ultraviolet emitters are fixedly installed on the end wall of the treatment tank. Each antibiotic treatment ultraviolet emitter is arranged in a corresponding manner to the protective shell. A water tank is fixedly installed on the treatment tank. A cleaning water pump is installed on the water tank. The cleaning water pump is connected to the inside of the water tank. A cleaning water pipe is connected to the cleaning water pump and is connected to the antibiotic treatment ultraviolet emitter.

[0010] Preferably, the treatment tank end wall is provided with a resistance gene treatment mechanism, the resistance gene treatment mechanism includes a first partition plate fixedly installed inside the treatment tank, a plurality of first partition channels are provided through the first partition plate, a first partition valve is fixedly installed between the end walls of the first partition channels, a pH value detector and an ozone concentration sensor are fixedly installed on the first partition plate, an ozone tank is fixedly installed on the outside of the treatment tank, the ozone tank is connected to the inside of the treatment tank through an ozone injection valve, and a control box is fixedly installed on the outside of the treatment tank.

[0011] Preferably, the eutrophic wastewater treatment mechanism includes polyurethane sponges symmetrically fixedly installed inside the treatment tank on the lower side of the first partition plate, a second partition plate fixedly installed inside the treatment tank, a plurality of second partition channels penetrating the second partition plate, and a second partition valve fixedly installed in the second partition channels. Nitrifying bacteria and polyphosphate bacteria are attached to one side of the polyurethane sponge, while denitrifying bacteria are attached to the other side of the polyurethane sponge.

[0012] Preferably, the deep purification mechanism includes several purification mesh frames evenly installed inside the treatment tank. The purification mesh frames are filled with activated carbon, oyster shells, and zeolite from top to bottom. A third partition plate is installed inside the treatment tank. A third partition channel is machined through the third partition plate. A third partition valve is fixedly installed between the end walls of the third partition channel.

[0013] Preferably, the disinfection mechanism includes a plurality of ultraviolet disinfection devices uniformly and fixedly installed inside the treatment tank.

[0014] Preferably, the discharge mechanism includes a sealing block installed at the bottom of the treatment tank, a water quality analyzer installed on the sealing block, a discharge pipe connected to the sealing block, the discharge pipe connected to a drainage pump fixedly installed on the sealing block, and extraction pumps symmetrically installed on the sealing block. The extraction pumps are connected to a return water pipe, which has several branches. Each different branch is connected to a different position on the treatment tank, and each branch is equipped with a control valve.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention provides a treatment device for aquaculture wastewater containing microplastics and antibiotics. When the wastewater enters the preliminary filtration mechanism through the water injection cylinder, the rotating cylinder is driven by the impact of the drive plate and water flow, causing the hemispherical block to continuously strike the filter plate. Combined with the vibration of the filter plate spring, this effectively prevents suspended particles, uneaten feed and other impurities from clogging the filter screen. At the same time, the filter residue is automatically guided into the collection box by the intermittent opening and closing of the release gear and baffle. This achieves automatic cleaning and efficient operation of the filtration process. It is especially suitable for aquaculture wastewater with high suspended solids content, which can significantly improve pretreatment efficiency and ensure the stable operation of subsequent treatment units. 2. A treatment device for aquaculture wastewater containing microplastics and antibiotics is provided. When the wastewater enters the microplastic treatment mechanism, the microplastics are extracted in real time to the collection tank under the negative pressure of a vacuum pump by a combination of a multi-layer filter frame filled with plastic wood-based filter material and modified volcanic rock as adsorption media, and a stirring shaft driving the extraction frame to rotate. This achieves efficient interception and centralized recovery of microplastics, especially for microplastics with a wide particle size range (0.1-5mm) and nano-sized microplastics. The combined filtration and dynamic extraction mechanism can significantly improve the microplastic removal rate and avoid secondary pollution. 3. A treatment device for aquaculture wastewater containing microplastics and antibiotics is provided. It can achieve simultaneous and deep removal of microplastics, antibiotics, resistance genes and eutrophication pollutants by integrating antibiotic treatment, resistance gene treatment and eutrophication treatment mechanisms in a multi-stage treatment unit. It utilizes ultraviolet-ozone synergistic oxidation to degrade antibiotics and resistance genes, and combines polyurethane sponge to fix functional bacteria for nitrification, denitrification and phosphorus removal. It is especially suitable for aquaculture wastewater with compound pollution, and can effectively improve the comprehensive purification effect of wastewater and meet strict discharge standards. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0017] In the attached diagram: Figure 1 This is a schematic diagram of the first orientation of a treatment device for aquaculture wastewater containing microplastics and antibiotics according to the present invention. Figure 2 This is a schematic diagram of the second orientation of a treatment device for aquaculture wastewater containing microplastics and antibiotics according to the present invention. Figure 3 This is a third-angle structural diagram of a treatment device for aquaculture wastewater containing microplastics and antibiotics according to the present invention. Figure 4 This is a schematic diagram of the fourth direction structure of a treatment device for aquaculture wastewater containing microplastics and antibiotics according to the present invention. Figure 5 This is a schematic diagram of the first disassembled structure of a treatment device for aquaculture wastewater containing microplastics and antibiotics according to the present invention. Figure 6 This is a schematic diagram of the second disassembled structure of a treatment device for aquaculture wastewater containing microplastics and antibiotics according to the present invention. Figure 7 This is a schematic diagram of the third disassembled structure of a treatment device for aquaculture wastewater containing microplastics and antibiotics according to the present invention. Figure 8 This is a schematic diagram of the third disassembled structure of a treatment device for aquaculture wastewater containing microplastics and antibiotics according to the present invention. Figure 9 This is a first partial cross-sectional view of a treatment device for aquaculture wastewater containing microplastics and antibiotics according to the present invention. Figure 10 This is a second partial cross-sectional view of a treatment device for aquaculture wastewater containing microplastics and antibiotics according to the present invention. Figure 11 This is a third partial cross-sectional view of a treatment device for aquaculture wastewater containing microplastics and antibiotics according to the present invention. Figure 12 This is a second partial cross-sectional view of a treatment device for aquaculture wastewater containing microplastics and antibiotics according to the present invention. Figure 13 for Figure 5 Enlarged structural diagram at point A; Figure 14 for Figure 9 Enlarged structural diagram at point B; Figure 15 for Figure 9 A magnified structural diagram at point C.

[0018] In the diagram: 1-Base plate, 2-Water injection cylinder frame, 3-Water injection cylinder, 4-Collection tank, 5-Water injection pipe, 6-Locking assembly, 601-Support platform, 602-Locking clamp, 603-Bolt, 7-Injection pump, 8-Treatment tank, 9-Outrigger, 10-Return water pipe, 11-Control box, 12-Cleaning water pipe, 13-Mounting bracket, 14-Vacuum pump, 15-Collection tank, 16-Water tank, 17-Oxidizer supply tank, 18-Agitator motor, 20-Ozone tank, 21-Sealing block, 22-Discharge pipe, 23-Transmission box, 24-Cleaning water pump 25-Horizontal frame, 26-Discharge valve, 27-Filter plate, 28-Filter plate spring, 29-Filter plate spring seat, 30-Drive plate, 31-Drive shaft, 32-Slide rod, 33-Hemispherical block, 34-Extraction pipe, 35-Agitator shaft, 36-Oxidizer supply nozzle, 37-Extraction rack, 38-Filter screen frame, 39-Protective shell, 40-Agitator rod, 41-Agitator plate, 42-First partition plate, 43-Second partition plate, 44-Third partition plate, 45-Ultraviolet disinfection device, 46-Water quality analyzer, 47-Polyurethane sponge 48-Purification mesh frame, 50-Baffle, 51-Ozone concentration sensor, 52-pH meter, 53-Cleaning nozzle, 54-Antibiotic treatment UV emitter, 55-First partition channel, 56-First partition valve, 57-Second partition valve, 58-Second partition channel, 59-Third partition valve, 60-Third partition channel, 61-Ozone injection valve, 62-Filter collection channel, 63-Oxidizer supply valve, 65-Extraction pump, 66-Control valve, 67-Torsion spring, 68-Release gear, 69-Release gear shaft 70-Incomplete gear shaft, 71-Release incomplete gear, 72-Transmission gear, 73-Drive incomplete gear, 74-Pulley shaft, 75-Driven pulley, 76-Belt, 77-Driven pulley, 78-Agitator drive pulley shaft, 79-Agitator drive pulley, 80-Agitator belt, 81-Agitator driven pulley, 82-Agitator driven pulley shaft, 83-Hollow section, 84-Cylinder, 85-Connecting hole, 86-Extraction channel, 87-Pressure valve, 88-Extraction chamber, 89-Fixed cylinder, 90-Striking spring, 91-Rotating drum. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0020] like Figure 1-15As shown, the present invention provides a treatment device for aquaculture wastewater containing microplastics and antibiotics, including a base plate 1, a feeding mechanism on the base plate 1, a preliminary filtration mechanism connected to the feeding mechanism, a microplastic treatment mechanism connected to the end of the feeding mechanism, an eutrophic wastewater treatment mechanism connected to the lower side of the microplastic treatment mechanism, a deep purification mechanism connected to the lower side of the eutrophic wastewater treatment mechanism, a disinfection mechanism connected to the lower side of the deep purification mechanism, and a discharge mechanism connected to the lower side of the disinfection mechanism. The feeding mechanism is used to inject aquaculture wastewater; the preliminary filtration mechanism is used to filter and intercept suspended particles, uneaten feed, plant debris, etc. in the wastewater to prevent clogging of the subsequent purification zone; the microplastic treatment mechanism is used to remove microplastics from the wastewater; the eutrophic wastewater treatment mechanism is used to remove nutrients from the wastewater; the deep purification mechanism is used to perform deep purification and filtration of the wastewater; the disinfection mechanism is used to perform final disinfection of the wastewater; and the discharge mechanism is used to discharge the wastewater.

[0021] Advantageously, the test injection mechanism includes a water injection cylinder frame 2 installed on the base plate 1, a water injection cylinder 3 installed on the water injection cylinder frame 2, a water injection pipe 5 connected to one end of the lower part of the water injection cylinder 3, an injection pump 7 connected to the other end of the water injection pipe 5, the injection pump 7 installed on the top of the treatment tank 8, a plurality of support legs 9 installed on the lower part of the treatment tank 8, the support legs 9 welded to the base plate 1, and the water injection pipe 5 installed on the base plate 1 by a locking assembly 6; The locking assembly 6 includes a support platform third partition channel 601, a locking clamp third partition channel 602, and a bolt third partition channel 603. The support platform third partition channel 601 is installed on the base plate 1. The water injection pipe 5 is locked to the support platform third partition channel 601 through the locking clamp third partition channel 602 and the bolt third partition channel 603. During operation, aquaculture wastewater is injected into the injection cylinder 3, and the injection pump 7 is started to extract the wastewater, so that the wastewater in the injection cylinder 3 enters the treatment tank 8 through the injection pipe 5 and the injection pump 7.

[0022] Advantageously, the preliminary filtration mechanism includes a collection box 4 installed on the water injection cylinder 3, a filter plate 27 slidably connected to the inner end wall of the water injection cylinder 3, a plurality of filter plate spring seats 29 installed on the inner end wall of the water injection cylinder 3, a filter plate spring 28 connected to the upper part of the filter plate spring seat 29, the filter plate spring 28 connected to the filter plate 27, a drive shaft 31 rotatably connected through the water injection cylinder 3 below the filter plate 27, a rotating cylinder 91 fixedly installed on the outer surface of the drive shaft 31, and a plurality of uniformly fixedly connected elements on the outer surface of the rotating cylinder 91. A drive plate 30 is installed, and several fixed cylinders 89 are evenly fixed on the outer surface of the rotating cylinder 91 between adjacent drive plates 30. A slide rod 32 is slidably connected inside the fixed cylinder 89, and a hemispherical block 33 is fixedly connected to the outer end of the slide rod 32. A striking spring 90 is connected between the slide rod 32 and the inner bottom wall of the fixed cylinder 89. The hemispherical block 33 strikes the bottom of the filter plate 27. One end of the drive shaft 31 extends into the transmission box 23, which is fixedly installed on the water injection cylinder 3 and connected to the collection box 4. Next, a drive pulley 77 is fixedly connected to the end of the drive shaft 31. The drive pulley 77 and the driven pulley 75 are connected and driven by a belt 76. The driven pulley 75 is fixedly installed at the end of the pulley shaft 74. The pulley shaft 74 is rotatably installed in the transmission box 23. A drive incomplete gear 73 is fixedly connected to the outer surface of the pulley shaft 74. The drive incomplete gear 73 meshes with a transmission gear 72. The transmission gear 72 is fixedly installed at the end of the incomplete gear shaft 70. The incomplete gear shaft 70 is rotatably installed in the transmission box 23. A release gear 68 is fixedly installed on the outer surface of the incomplete gear shaft 70. The release gear 68 is rotatably installed inside the transmission box 23 and extends into the collection box 4. The water injection cylinder 3 is provided with a filter collection channel 62, which connects the water injection cylinder 3 and the collection box 4. The release gear 68 extends into the filter collection channel 62. A baffle 50 is fixedly installed on the outer surface of the release gear 68 inside the filter collection channel 62. A torsion spring 67 connects the release gear 68 and the collection box 4. The filter collection channel 62 is located on the upper side of the filter plate 27 and close to the filter plate 27. The baffle 50 is slidably connected to the end wall of the filter collection channel 62 and is sealed. The bottom wall of the filter collection channel 62 is inclined at a certain angle and tilted towards the collection box 4. The filter plate 27 is set at a certain angle, and the center line of the filter plate 27 is concave downward and the two sides are convex, so that the center line position forms a V-shaped groove, which facilitates the filtered residue to enter the filter collection channel 62 smoothly. The incomplete gear shaft 70 is rotatably mounted on the collection box 4 and has a certain friction to prevent free rotation; During operation, wastewater is filtered by the filter plate 27 and falls onto the drive plate 30, thus pressing the drive plate 30 to move. The drive plate 30 is arc-shaped for easier rotation. When the drive plate 30 moves, it drives the rotating drum 91 to rotate, which in turn drives the drive shaft 31 to rotate. The rotating drum 91 drives the fixed cylinder 89 to rotate, which in turn drives the slide rod 32 to rotate, which in turn drives the hemispherical block 33 to rotate. The rotation of the hemispherical block 33 strikes the filter plate 27. The interaction between the hemispherical block 33 and the filter plate spring 28 keeps the filter plate 27 in a vibrating state, increasing filtration efficiency and preventing clogging. The suspended particles, residual bait, plant debris, etc., filtered by the filter plate 27 enter the filter collection channel 62 along the V-shaped groove. When the drive shaft 31 rotates, it drives the driving pulley 77 to rotate, which in turn drives the belt 76 to move, which in turn drives the driven pulley 75 to move, which in turn drives the pulley shaft 76 to move. 4. Rotation causes the incomplete drive gear 73 to rotate. The incomplete drive gear 73 meshes with the transmission gear 72, thereby causing the incomplete gear shaft 70 to rotate, which in turn causes the incomplete release gear 71 to rotate. The incomplete release gear 71 then meshes with the release gear 68, causing the release gear shaft 69 to rotate. This causes the baffle 50 to move and open the filter collection channel 62, allowing filtered suspended particles, uneaten bait, plant debris, etc., to enter the collection box 4. There is friction between the incomplete gear shaft 70 and the collection box 4, preventing free rotation. After the pulley shaft 74 rotates a few times, it causes the incomplete gear shaft 70 to rotate one revolution, thereby causing the release gear 68 to rotate once, tightening the torsion spring 67. After the incomplete release gear 71 disengages from the release gear 68, the torsion spring 67 causes the release gear shaft 69 to return to its original position, causing the baffle 50 to close the filter collection channel 62.

[0023] Advantageously, the microplastic treatment mechanism includes a filter frame 38 uniformly fixedly installed inside the treatment tank 8. From top to bottom, the filter frame 38 is filled with a composite adsorbent material consisting of a plastic wood-based filter material, modified volcanic rock, modified activated carbon, and diatomaceous earth. A stirring shaft 35 is rotatably connected through the middle of the filter frame 38. The top of the stirring shaft 35 is rotatably connected to a crossbeam 25. The crossbeam 25 is fixedly installed through the treatment tank 8. A driven stirring pulley shaft 82 is rotatably connected inside the crossbeam 25. The driven stirring pulley shaft 82 is fixedly connected to the stirring shaft 35. A driven stirring pulley 81 is fixedly installed on the outer surface of the driven stirring pulley shaft 82. The driven stirring pulley 81 and the driven stirring pulley 79 are connected and driven by a stirring belt 80. The driven stirring pulley 79 is fixedly installed on the outer surface of the driven stirring pulley shaft 78. The driven stirring pulley shaft 78 is rotatably installed on the crossbeam 25. A stirring motor 18 is powered and mounted on the crossbeam 25 outside the processing tank 8. An extraction frame 37 is fixedly connected to the stirring shaft 35. The extraction frame 37 has an extraction chamber 88, which communicates with a hollow section 83 located within the stirring shaft 35. The extraction frame 37 contacts the upper surface of the filter screen frame 38. Several extraction channels 86 are provided through the bottom wall of the extraction chamber 88, and pressure valves 87 are installed between the end walls of the extraction channels 86. A cylinder 84 is rotatably connected to the outer surface of the stirring shaft 35. The cylinder 84 is connected to the hollow section 83 through a plurality of connecting holes 85 provided through the end wall of the hollow section 83. One end of the extraction tube 34 is connected to the cylinder 84, and the other end of the extraction tube 34 is connected to the inside of the collection tank 15. The collection tank 15 is installed on the outside of the processing tank 8 through the mounting bracket 13. A vacuum pump 14 is installed on the collection tank 15, and a discharge valve 26 is provided at the bottom of the collection tank 15. During operation, the wastewater enters the treatment tank 8 and passes sequentially through the filter frames 38. Different composite adsorbent materials within the filter frames 38—plastic wood-based filter materials, modified volcanic rock, modified activated carbon, and diatomaceous earth—filter the wastewater, removing microplastics. The filtered microplastics are located on the filter frames 38. The stirring motor 18 is then activated, driving the stirring drive pulley shaft 78 to rotate, which in turn drives the stirring drive pulley 79. The stirring drive pulley 79 and the stirring driven pulley 81 are connected by the stirring belt 80, which in turn drives the stirring driven pulley shaft 82 to rotate. This causes the stirring shaft 35 to rotate, which in turn causes the extraction frame 37 to rotate. Simultaneously, the vacuum pump 14 is activated to extract air, creating a negative pressure inside the collection tank 15, which in turn creates a negative pressure inside the extraction chamber 88. This causes the pressure valve 87 to open, allowing the microplastics on the filter screen 38 to pass through the pressure valve 87 into the extraction channel 86, and then into the extraction chamber 88. From there, they pass through the hollow section 83 into the cylinder 84, and through the extraction tube 34 into the collection tank 15 for collection. Finally, the collected microplastics are discharged from the collection tank 15 by opening the discharge valve 26.

[0024] Advantageously, the treatment tank 8 is equipped with an antibiotic treatment mechanism located below the microplastic treatment mechanism. The antibiotic treatment mechanism includes a protective shell 39 uniformly and fixedly installed on the inner surface of the treatment tank 8. A cleaning nozzle 53 is installed inside the protective shell 39. A plurality of stirring rods 40 are uniformly and rotatably connected to the outer surface of the stirring shaft 35 below the filter frame 38. A stirring plate 41 is uniformly and fixedly installed on the outer surface of the stirring rods 40. An oxidizer supply tank 17 is fixedly installed on the outer surface of the treatment tank 8. An oxidizer supply nozzle 36 is fixedly connected to the inner end wall of the treatment tank 8. An oxidizer supply valve 63 is connected between the oxidizer supply nozzle 36 and the oxidizer supply tank 17. A plurality of antibiotic treatment ultraviolet emitters 54 are fixedly installed on the end wall of the treatment tank 8. Each antibiotic treatment ultraviolet emitter 54 is correspondingly arranged with the protective shell 39. A water tank 16 is fixedly installed on the treatment tank 8. A cleaning water pump 24 is installed on the water tank 16. The cleaning water pump 24 is connected to the inside of the water tank 16. A cleaning water pipe 12 is connected to the cleaning water pump 24. The cleaning water pipe 12 is connected to the antibiotic treatment ultraviolet emitter 54. During operation, the rotation of the stirring shaft 35 drives the stirring rod 40 to rotate, which in turn drives the stirring plate 41 to rotate, thereby agitating the wastewater. The cleaning nozzle 53 is opened to emit ultraviolet light, and the oxidizer supply valve 63 is opened, allowing potassium persulfate from the oxidizer supply tank 17 to enter the treatment tank 8 through the oxidizer supply valve 63 and the oxidizer supply nozzle 36. The amount added is controlled by the duration the oxidizer supply valve 63 is open. The rotation of the stirring plate 41 and the action of the cleaning nozzle 53 result in better agitation of the wastewater. The reaction removes antibiotics from the effluent and further removes microplastics. The pH meter 52 detects the pH value of the effluent. After treatment, the cleaning water pump 24 is started to draw water from the water tank 16 and allow it to enter the cleaning water pipe 12, which in turn enters the antibiotic treatment ultraviolet emitter 54. The water is then sprayed from the antibiotic treatment ultraviolet emitter 54 onto the surface of the protective shell 39, thereby cleaning the surface of the protective shell 39 and preventing it from affecting subsequent treatment and the ultraviolet emission of the cleaning nozzle 53.

[0025] Advantageously, the treatment tank 8 is provided with a resistance gene treatment mechanism on its end wall. The resistance gene treatment mechanism includes a first partition plate 42 fixedly installed inside the treatment tank 8. A plurality of first partition channels 55 are provided through the first partition plate 42. A first partition valve 56 is fixedly installed between the end walls of the first partition channels 55. A pH value detector 52 and an ozone concentration sensor 51 are fixedly installed on the first partition plate 42. An ozone tank 20 is fixedly installed on the outside of the treatment tank 8. The ozone tank 20 is connected to the inside of the treatment tank 8 through an ozone injection valve 61. A control box 11 is fixedly installed on the outside of the treatment tank 8. The control box 11 is connected to the electrical components in the device. The control box 11 is provided with a control processor. The control processor is provided with a corresponding control processing program. During operation, the ozone injection valve 61 is opened to introduce ozone into the treatment tank 8. The ozone concentration sensor 51 detects the ozone concentration in the treatment tank 8. In conjunction with the cleaning nozzle 53, the ultraviolet light generated by the cleaning nozzle 53 can directly destroy the DNA double-stranded structure of the resistance gene, causing it to lose its replication ability. The oxidation reaction of ozone can remove the remaining resistance gene. After the reaction, the first separation valve 56 is opened, so that the treated effluent enters the lower side of the first separation plate 42.

[0026] Advantageously, the eutrophic wastewater treatment mechanism includes polyurethane sponge 47 symmetrically fixedly installed inside the treatment tank 8 on the lower side of the first partition plate 42, a second partition plate 43 fixedly installed inside the treatment tank 8, a plurality of second partition channels 58 penetrating the second partition plate 43, and a second partition valve 57 fixedly installed inside the second partition channels 58. On one side of the polyurethane sponge 47, nitrifying bacteria (nitrosomonas and nitrifying bacteria) and polyphosphate-accumulating bacteria (aeromonas) are attached, forming an aerobic zone that treats inorganic phosphorus and ammonium nitrogen in wastewater; on the other side of the polyurethane sponge 47, denitrifying bacteria (denitrifying vibrio) are attached, treating nitrate nitrogen and nitrite nitrogen in wastewater, forming an anaerobic zone. During operation, nitrifying bacteria, polyphosphate-accumulating bacteria, and denitrifying bacteria are used to remove beneficial and anaerobic organisms from the effluent and to remove eutrophic substances from the effluent. After the removal is completed, the second separation valve 57 is opened, allowing the effluent to enter the lower side of the second separation plate 43 through the second separation channel 58.

[0027] Advantageously, the deep purification mechanism includes a plurality of purification mesh frames 48 evenly installed inside the treatment tank 8. The purification mesh frames 48 are filled with activated carbon, oyster shells and zeolite in sequence from top to bottom. A third partition plate 44 is installed inside the treatment tank 8. A third partition channel 60 is processed through the third partition plate 44. A third partition valve 59 is fixedly installed between the end walls of the third partition channel 60. During operation, the wastewater undergoes further purification and filtration through activated carbon, oyster shells, and zeolite within the purification mesh frame 48. After filtration, the third dividing valve 59 is opened, allowing the wastewater to enter the lower side of the third dividing plate 44 through the third dividing channel 60.

[0028] Advantageously, the disinfection mechanism includes a plurality of ultraviolet disinfection units 45 uniformly and fixedly installed inside the treatment tank 8; During operation, the ultraviolet sterilizer 45 is turned on to generate ultraviolet light, which disinfects the wastewater once again.

[0029] Advantageously, the discharge mechanism includes a sealing block 21 installed at the lower part of the treatment tank 8, a water quality analyzer 46 installed on the sealing block 21, a discharge pipe 22 connected to the sealing block 21, the discharge pipe 22 being connected to a drainage pump fixedly installed on the sealing block 21, and extraction pumps 65 symmetrically installed on the sealing block 21. The extraction pumps 65 are connected to a return water pipe 10, which has several branches. Each different branch is connected to a different position of the treatment tank 8, and each branch is equipped with a control valve 66. Different branches are connected to different mechanisms. During operation, the water quality analyzer 46 tests the effluent. If the test is qualified, the drain pump is turned on, allowing the effluent to be discharged through the discharge pipe 22. If any part fails the test, the extraction pump 65 is started, and the corresponding control valve 66 is opened. The extraction pump 65 extracts the effluent, which then enters the corresponding branch pipe through the return water pipe 10 and enters the corresponding treatment unit for further processing.

[0030] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0031] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A treatment device for aquaculture wastewater containing microplastics and antibiotics, characterized in that: Includes a base plate (1), on which a material injection mechanism is provided, a preliminary filtration mechanism is connected to the material injection mechanism, a microplastic treatment mechanism is connected to the end of the material injection mechanism, an eutrophic wastewater treatment mechanism is connected to the lower side of the microplastic treatment mechanism, a deep purification mechanism is connected to the lower side of the eutrophic wastewater treatment mechanism, a disinfection mechanism is connected to the lower side of the deep purification mechanism, and a discharge mechanism is connected to the lower side of the disinfection mechanism. The feeding mechanism is used to inject aquaculture wastewater; the preliminary filtration mechanism is used to filter and intercept suspended particles, uneaten feed, plant debris, etc. in the wastewater to prevent clogging of the subsequent purification zone; the microplastic treatment mechanism is used to remove microplastics from the wastewater; the eutrophic wastewater treatment mechanism is used to remove nutrients from the wastewater; the deep purification mechanism is used to perform deep purification filtration on the wastewater; the disinfection mechanism is used to perform final disinfection of the wastewater; and the discharge mechanism is used to discharge the wastewater.

2. The treatment device for aquaculture wastewater containing microplastics and antibiotics according to claim 1, characterized in that: The test injection mechanism includes a water injection cylinder frame (2) installed on the base plate (1), a water injection cylinder (3) installed on the water injection cylinder frame (2), a water injection pipe (5) connected to one end of the lower part of the water injection cylinder (3), an injection pump (7) connected to the other end of the water injection pipe (5), the injection pump (7) installed on the top of the treatment tank (8), a number of support legs (9) installed on the lower part of the treatment tank (8), the support legs (9) welded to the base plate (1), and the water injection pipe (5) installed on the base plate (1) by a locking assembly (6); The locking assembly (6) includes a third partition channel (601) for the support platform, a third partition channel (602) for the locking clamp, and a third partition channel (603) for the bolt. The third partition channel (601) for the support platform is installed on the base plate (1). The water injection pipe (5) is locked to the third partition channel (601) for the support platform through the third partition channel (602) for the locking clamp and the third partition channel (603) for the bolt.

3. The treatment device for aquaculture wastewater containing microplastics and antibiotics according to claim 2, characterized in that: The preliminary filtration mechanism includes a collection box (4) installed on the water injection cylinder (3), a filter plate (27) slidably connected to the inner end wall of the water injection cylinder (3), a plurality of filter plate spring seats (29) installed on the inner end wall of the water injection cylinder (3), a filter plate spring (28) connected to the upper part of the filter plate spring seat (29), the filter plate spring (28) connected to the filter plate (27), a drive shaft (31) rotatably connected through the water injection cylinder (3) on the lower side of the filter plate (27), a rotating cylinder (91) fixedly installed on the outer surface of the drive shaft (31), and a plurality of drive plates (91) uniformly fixedly connected to the outer surface of the rotating cylinder (91). 30), several fixed cylinders (89) are uniformly fixedly installed on the outer surface of the rotating cylinder (91) between adjacent drive plates (30). A sliding rod (32) is slidably connected inside the fixed cylinder (89). A hemispherical block (33) is fixedly connected to the outer end of the sliding rod (32). A striking spring (90) is connected between the sliding rod (32) and the inner bottom wall of the fixed cylinder (89). The hemispherical block (33) strikes the bottom of the filter plate (27). One end of the drive shaft (31) extends into the transmission box (23). The transmission box (23) is fixedly installed on the water injection cylinder (3) and connected to the collection box (4). A drive pulley (77) is fixedly connected to the end of the drive shaft (31). The drive pulley (77) and the driven pulley (75) are connected by a belt (76). The driven pulley (75) is fixedly installed at the end of the pulley shaft (74). The pulley shaft (74) is rotatably installed in the transmission box (23). A drive incomplete gear (73) is fixedly connected to the outer surface of the pulley shaft (74). The drive incomplete gear (73) meshes with a transmission gear (72). The transmission gear (72) is fixedly installed at the end of the incomplete gear shaft (70). The incomplete gear shaft (70) is rotatably installed in the transmission box (23). A release gear (68) is fixedly installed on the outer surface of the incomplete gear shaft (70). The release gear (68) is rotatably installed inside the transmission box (23) and extends into the collection box (4). A filter collection channel (62) is provided on the water injection cylinder (3). The filter collection channel (62) connects the water injection cylinder (3) and the collection box (4). The release gear (68) extends into the filter collection channel (62). A baffle (50) is fixedly installed on the outer surface of the release gear (68) inside the filter collection channel (62). A torsion spring (67) is connected between the release gear (68) and the collection box (4). The filter collection channel (62) is located on the upper side of the filter plate (27) and close to the filter plate (27). The baffle (50) is slidably connected to the end wall of the filter collection channel (62) and is sealed. The bottom wall of the filter collection channel (62) is inclined at a certain angle and tilted towards the collection box (4). The filter plate (27) is set at a certain angle, and the center line of the filter plate (27) is recessed downward and the sides are raised, so that the center line presents a V-shaped groove, which makes it easy for the filtered residue to enter the filter collection channel (62). The incomplete gear shaft (70) is rotatably mounted on the collection box (4) and has a certain frictional force to prevent free rotation.

4. The treatment device for aquaculture wastewater containing microplastics and antibiotics according to claim 3, characterized in that: The microplastic treatment mechanism includes a filter frame (38) uniformly fixedly installed inside the treatment tank (8). From top to bottom, the filter frame (38) is filled with plastic wood-based filter material, modified volcanic rock, modified activated carbon, and diatomaceous earth composite adsorbent material, respectively. A stirring shaft (35) is rotatably connected through the middle of the filter frame (38). The top of the stirring shaft (35) is rotatably connected to a crossbar (25). The crossbar (25) is fixedly installed through the treatment tank (8). A driven pulley shaft (8) is rotatably connected inside the crossbar (25). 2) The driven pulley shaft (82) is fixedly connected to the stirring shaft (35). A driven pulley (81) is fixedly installed on the outer surface of the driven pulley shaft (82). The driven pulley (81) and the driving pulley (79) are connected and driven by a stirring belt (80). The driving pulley (79) is fixedly installed on the outer surface of the driving pulley shaft (78). The driving pulley shaft (78) is rotatably installed on the crossbeam (25). The driving pulley shaft (78) is fixedly installed in the processing tank (8). The stirring motor (18) on the outer crossbeam (25) is powered. An extraction frame (37) is fixedly connected to the stirring shaft (35). An extraction chamber (88) is provided inside the extraction frame (37), and the extraction chamber (88) communicates with the hollow section (83) located within the stirring shaft (35). The extraction frame (37) contacts the upper surface of the filter screen frame (38). Several extraction channels (86) are provided through the bottom wall of the extraction chamber (88). Pressure valves (87) are installed between the end walls of the extraction channels (86). The stirring shaft (35) A cylinder (84) is rotatably connected to the outer surface. The cylinder (84) is connected to the hollow section (83) through a plurality of connecting holes (85) through the end wall of the hollow section (83). One end of an extraction tube (34) is connected to the cylinder (84). The other end of the extraction tube (34) is connected to the inside of the collection tank (15). The collection tank (15) is installed on the outside of the processing tank (8) by a mounting bracket (13). A vacuum pump (14) is installed on the collection tank (15). A discharge valve (26) is provided at the bottom of the collection tank (15).

5. The treatment device for aquaculture wastewater containing microplastics and antibiotics according to claim 4, characterized in that: The processing tank (8) is equipped with an antibiotic processing mechanism located below the microplastic processing mechanism. The antibiotic processing mechanism includes a protective shell (39) uniformly fixedly installed on the inner surface of the processing tank (8). A cleaning nozzle (53) is installed inside the protective shell (39). Several stirring rods (40) are uniformly rotatably connected to the outer surface of the stirring shaft (35) below the filter frame (38). A stirring plate (41) is uniformly fixedly installed on the outer surface of the stirring rods (40). An oxidizer supply tank (17) is fixedly installed on the outer surface of the processing tank (8). An oxidizer supply nozzle (36) is fixedly connected to the inner end wall of the processing tank (8). An oxidizer supply valve (63) is connected between the oxidizer supply nozzle (36) and the oxidizer supply tank (17). A plurality of antibiotic treatment ultraviolet emitters (54) are fixedly installed on the end wall of the treatment tank (8). The antibiotic treatment ultraviolet emitters (54) are arranged one-to-one with the protective shell (39). A water tank (16) is fixedly installed on the treatment tank (8). A cleaning water pump (24) is installed on the water tank (16). The cleaning water pump (24) is connected to the inside of the water tank (16). A cleaning water pipe (12) is connected to the cleaning water pump (24). The cleaning water pipe (12) is connected to the antibiotic treatment ultraviolet emitter (54).

6. The treatment device for aquaculture wastewater containing microplastics and antibiotics according to claim 5, characterized in that: The treatment tank (8) is provided with a resistance gene treatment mechanism on its end wall. The resistance gene treatment mechanism includes a first partition plate (42) fixedly installed inside the treatment tank (8). A plurality of first partition channels (55) are provided through the first partition plate (42). A first partition valve (56) is fixedly installed between the end walls of the first partition channels (55). A pH value detector (52) and an ozone concentration sensor (51) are fixedly installed on the first partition plate (42). An ozone tank (20) is fixedly installed on the outside of the treatment tank (8). The ozone tank (20) is connected to the inside of the treatment tank (8) through an ozone injection valve (61). A control box (11) is fixedly installed on the outside of the treatment tank (8).

7. The treatment device for aquaculture wastewater containing microplastics and antibiotics according to claim 6, characterized in that: The eutrophic wastewater treatment mechanism includes polyurethane sponge (47) symmetrically fixedly installed inside the treatment tank (8) below the first partition plate (42), a second partition plate (43) fixedly installed inside the treatment tank (8), a plurality of second partition channels (58) are provided through the second partition plate (43), and a second partition valve (57) is fixedly installed inside the second partition channel (58). Nitrifying bacteria and polyphosphate bacteria are attached to one side of the polyurethane sponge (47), while denitrifying bacteria are attached to the other side of the polyurethane sponge (47).

8. The treatment device for aquaculture wastewater containing microplastics and antibiotics according to claim 7, characterized in that: The deep purification mechanism includes several purification mesh frames (48) evenly installed inside the treatment tank (8). The purification mesh frames (48) from top to bottom are filled with activated carbon, oyster shells and zeolite in one go. A third partition plate (44) is installed inside the treatment tank (8). A third partition channel (60) is processed through the third partition plate (44). A third partition valve (59) is fixedly installed between the end walls of the third partition channel (60).

9. The treatment device for aquaculture wastewater containing microplastics and antibiotics according to claim 8, characterized in that: The disinfection mechanism includes several ultraviolet disinfection units (45) that are uniformly and fixedly installed inside the treatment tank (8).

10. The treatment device for aquaculture wastewater containing microplastics and antibiotics according to claim 9, characterized in that: The discharge mechanism includes a sealing block (21) installed at the bottom of the treatment tank (8), a water quality tester (46) installed on the sealing block (21), a discharge pipe (22) connected to the sealing block (21), the discharge pipe (22) being connected to a drainage pump fixedly installed on the sealing block (21), and extraction pumps (65) symmetrically installed on the sealing block (21). The extraction pumps (65) are connected to a return water pipe (10), which has several branches. Each different branch is connected to a different position of the treatment tank (8), and each branch is equipped with a control valve (66).

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