Energy-saving circulating water purification system for industrialized aquaculture

Abstract

The utility model discloses a kind of industrial aquaculture energy-saving circulating water purification systems, including horizontal pipe filter, carousel membrane bioreactor and ozone ultraviolet sterilizer, breeding water is first filtered by horizontal pipe filter and is handled, then it is biologically oxygenated by carousel membrane bioreactor and is purified, and then it is disinfected and sterilized by ozone ultraviolet sterilizer;The filter includes cylinder, overflow pipe is equipped in the upper end side of cylinder, and liquid level sensor is built-in in cylinder, sewage pipe is equipped in the bottom of cylinder, and water outlet pipe A is arranged in cylinder;The carousel membrane bioreactor includes contact reaction tank, the upper surface of contact reaction tank is centrally equipped with shaft, and biological adhesion bin is fixedly sleeved on the shaft, and biological ball is filled in biological adhesion bin;The ozone ultraviolet sterilizer includes outer tube, and outer tube one end is equipped with connecting flange, and aeration disc is arranged in connecting flange, and gas pipe is equipped on aeration disc, and gas pipe passes through connecting flange and is connected with gas supply equipment.

Description

Technical Field

[0001] This utility model relates to the field of aquaculture water purification technology, and in particular to an energy-saving circulating water purification system for factory-scale aquaculture. Background Technology

[0002] Factory-style recirculating aquaculture systems are industrialized aquaculture production models operating within closed or semi-closed water systems under artificial control. Their core feature is the treatment and recycling of aquaculture water. This system is characterized by energy saving, water saving, land saving, safety, high efficiency, and full controllability. It enables artificial control of the aquaculture environment, recycling of aquaculture water, mechanization of the production process, and proceduralization of production management, and is hailed as a new technology in the aquaculture industry. Through efficient water treatment technology, it achieves precise control and recycling of water quality, thereby increasing stocking density and growth rate while reducing environmental pollution, significantly minimizing water consumption and environmental impact. It features stable water quality control, is unaffected by external climate, and can achieve continuous production.

[0003] Factory-style recirculating aquaculture has become an inevitable path for the development of the aquaculture industry and a necessary choice for the future of aquaculture. However, good source water and purified wastewater are the primary keys to realizing factory-style recirculating aquaculture. Proper treatment of both will save on necessary equipment and facilities in the recirculating water treatment system, thereby saving system energy consumption and reducing costs. Because wastewater from aquaculture contains particulate matter, protein foam, microorganisms, and bacteria, its large-scale discharge has exceeded the self-purification capacity of the regional environment, causing pollution and leading to numerous problems, including pollution of the aquaculture water source; increased fish diseases due to the use of polluted water; and food safety issues caused by the misuse of fish drugs. In recent years, with the development of the aquaculture economy, the excessive discharge of aquaculture wastewater has caused environmental pollution, river pollution, and near-shore marine pollution, resulting in periodic turbidity of river water and increased levels of pathogenic microorganisms in seawater, leading to the deterioration of source water quality. Consequently, fish deaths caused by polluted source water are frequent in aquaculture, significantly reducing survival rates, especially in the seedling industry, which has very strict water quality requirements. Therefore, the discharge of untreated aquaculture wastewater leads to water pollution and hinders the healthy development of factory-style aquaculture.

[0004] Currently, most domestic aquaculture systems cannot treat and reuse the wastewater generated in the aquaculture ponds, thus failing to achieve zero discharge of aquaculture wastewater. Moreover, the more effective systems generally require high investment, high costs, and long payback periods, making aquaculture an expensive activity and difficult to promote on a large scale. Utility Model Content

[0005] The purpose of this invention is to provide an energy-saving circulating water purification system for factory-scale aquaculture, enabling the reuse of circulating water in aquaculture. By installing a horizontal pipe filter and using a hydrodynamic component, the filter drum is driven by dual hydrodynamic forces, eliminating the need for a motor and achieving energy savings. Furthermore, by installing straight-line water jet spray pipes inside and outside the filter drum, high-pressure backwashing and low-pressure rinsing are used to achieve dual water washing treatment of the filter drum's adhering substances. This reduces the amount of rinsing water and the pressure of subsequent wastewater treatment, resulting in better cleaning effect and higher cleaning efficiency, while saving water and achieving self-cleaning and energy-saving goals.

[0006] The technical solution adopted in this utility model is as follows: An energy-saving circulating water treatment system for factory-scale aquaculture includes a horizontal pipe filter, a rotating membrane bioreactor, and an ozone ultraviolet sterilizer. The aquaculture water first undergoes primary filtration through the horizontal pipe filter, then undergoes biological aerobic purification through the rotating membrane bioreactor, and finally undergoes disinfection and sterilization purification through the ozone ultraviolet sterilizer; the water is then circulated into the aquaculture pond. The horizontal pipe filter includes a cylindrical body with a discharge pipe on one side of its upper end and a built-in liquid level sensor. A drain pipe is located at the bottom of the cylindrical body, and a water outlet pipe is installed inside the cylindrical body, with one end extending outwards through the body. A filter unit is rotatably connected to the water outlet pipe, and an impeller is mounted on the filter unit. An inlet distribution pipe is installed inside the cylindrical body on one side of the filter unit, with its outer end connected to an inlet pipe. A spray elbow is fitted onto the inner end of the inlet distribution pipe, with the spray elbow facing the filter unit, and the angle between the spray elbow and the side of the filter unit is acute. The outlet end of the inlet distribution pipe is aligned with the impeller. On the same plane, a rinsing unit is also installed on the cylinder, with some rinsing units distributed within the outlet pipe and the filter unit, and the other part of the rinsing unit located outside the cylinder. The rinsing unit located within the filter unit includes a blowpipe. Water jets from the inlet distribution pipe impact the impeller, and the impeller's rotation drives the filter unit to rotate. Water filling the cylinder is purified by the filter unit and discharged through the outlet pipe. When the purified water is discharged, some of the water flow is reinjected into the filter unit through the rinsing unit and rinsed from the inside out through the blowpipe. The outlet pipe is equipped with an outlet valve, which is connected to the inlet pipe of the rotating membrane bioreactor via a connecting pipe. The rotating membrane bioreactor includes a contact reaction tank. A rotating shaft is centrally located on the upper surface of the contact reaction tank, and a bio-attachment chamber is fixedly sleeved on the shaft. The bio-attachment chamber is filled with biospheres. One end of the bio-attachment chamber has an impeller arranged circumferentially around the rotating shaft. An inlet pipe is located diagonally above the impeller, and the inlet pipe is connected to the outlet pipe of a horizontal pipe filter. Water flows through the inlet pipe and impacts the impeller, causing the bio-attachment chamber to rotate uniformly within the contact reaction tank around the rotating shaft. This exposes the decomposing bacteria attached to the biospheres at the upper end of the bio-attachment chamber to the air for respiration. The upper part of the reaction tank is equipped with a discharge pipe, one end of which is inside the contact reaction tank and the other end is outside the contact reaction tank, for connecting to the ozone ultraviolet sterilizer; the upper part of the contact reaction tank is equipped with a drain outlet, which is used to connect to the water inlet pipe of the ozone ultraviolet sterilizer; the bio-attachment chamber includes multiple packing discs, which are equidistantly sleeved on the rotating shaft; the packing discs are hollow inside, and the bio-balls are placed inside the packing discs; the packing discs have an annular dish-shaped structure, and the ends of the packing discs are threadedly connected to a matching sealing cap, and the surfaces of the packing discs and the sealing caps are uniformly provided with permeable holes; The ozone ultraviolet sterilizer includes a cylindrical body with a connecting flange at one end. An aeration disc is installed inside the connecting flange, and an air pipe is mounted on the aeration disc, passing through the connecting flange and connected to an external air supply device. A spiral flow controller is installed inside the cylindrical body, and a germicidal lamp is arranged around the spiral flow controller. One end of the cylindrical body has a water inlet pipe for connecting to the outlet of the contact reaction tank, and the other end of the cylindrical body has a water outlet pipe equipped with a flow controller. Water filling the cylindrical body through the water inlet pipe is blocked by the spiral flow controller to form a slow flow, thereby extending the water's residence time in the cylindrical body and allowing it to fully receive irradiation from the germicidal lamp. The water inlet pipe is located on the upper surface of the cylindrical body, and the water outlet pipe is located on the lower surface, side, or upper surface of the cylindrical body, thus forming an angle of 0°, 90°, or 18° between the water inlet and outlet pipes. The spiral flow controller includes a first shaftless spiral blade, which is installed along the transverse central axis of the cylinder. Water filling the cylinder through the inlet pipe is slowed down by the first shaftless spiral blade and forms a swirling flow. When the spiral flow controller is a first shaftless spiral blade, its germicidal lamp includes a first ozone ultraviolet lamp tube, which passes through the central axis of the first shaftless spiral blade and is placed inside the first shaftless spiral blade. One end of the first ozone ultraviolet lamp tube is provided with a lamp tube support to fix it in the cylinder. The germicidal lamp also includes a second ozone ultraviolet lamp tube. Multiple second ozone ultraviolet lamp tubes are provided, and the multiple second ozone ultraviolet lamp tubes are arranged in a circular and equidistant manner around the first shaftless spiral blade in the cylinder. One end of the second ozone ultraviolet lamp tube is provided with a lamp tube support for fixing.

[0007] The filtration unit includes a first filter cartridge, and the water outlet direction of the blow pipe is directly opposite to the inner surface of the first filter cartridge. A bearing support seat is provided at the connection between the first filter cartridge and the water outlet pipe. Support frames are provided at both ends of the first filter cartridge, and a rotating frame is connected between the support frames. The rotating frame is circumferentially distributed in a equidistant manner against the surface of the first filter cartridge.

[0008] The flushing unit includes a backwash water pump, and the input end of the backwash water pump is connected to a backwash water supply pipe. The other end of the backwash water supply pipe is connected to the outlet of the outlet pipe. The output end of the backwash water pump is connected to a backwash water inlet pipe, which is inserted into the outlet pipe and concentric with the outlet pipe. The end of the backwash water inlet pipe passes through the side of the outlet pipe and is connected to the blowpipe.

[0009] The bio-attachment chamber includes multiple packing cylinders arranged in a circular pattern around a rotating shaft, with a first connecting plate symmetrically sleeved on the rotating shaft. The first connecting plate has evenly spaced insertion holes for inserting the packing cylinders, and the bio-balls are placed inside the packing cylinders. The ends of the packing cylinders are threadedly connected to end caps, and the surfaces of the packing cylinders and end caps are evenly spaced with water-permeable holes. A first reinforcing plate is sleeved at the center of the packing cylinder, and the structure of the first reinforcing plate is the same as that of the first connecting plate.

[0010] The bio-attachment chamber also includes a packing cage disposed outside the rotating shaft. The two ends of the packing cage are fixedly connected to a second connecting plate, which is sleeved on the rotating shaft. A second reinforcing plate is fixedly sleeved in the middle of the packing cage, and a screw is provided between the second connecting plate and the second reinforcing plate for reinforcement. One end of the packing cage is provided with a packing inlet and outlet around the rotating shaft. Bio-balls are filled into or discharged from the packing cage through the packing inlet and outlet. A sealing plug is provided on the packing inlet and outlet.

[0011] The spiral flow controller can also employ a first shaftless spiral blade and a second shaftless spiral blade. The first shaftless spiral blade is installed along the transverse central axis of the cylinder, and the second shaftless spiral blade is sleeved outside the first shaftless spiral blade. The first and second shaftless spiral blades are coaxially arranged within the cylinder, with space between them. When the spiral flow controller uses a first shaftless spiral blade and a second shaftless spiral blade, its germicidal lamp includes a first ozone ultraviolet lamp, a second ozone ultraviolet lamp, and a third ozone ultraviolet lamp. The first ozone ultraviolet lamp passes through the central axis of the first shaftless spiral plate and is placed inside the first shaftless spiral plate. The second ozone ultraviolet lamp is located between the first and second shaftless spiral plates, and the second ozone ultraviolet lamp is arranged in a circumferential equidistant pattern around the first shaftless spiral plate inside the cylinder. The third ozone ultraviolet lamp is arranged in a circumferential equidistant pattern around the second shaftless spiral plate inside the cylinder. Each of the first, second, and third ozone ultraviolet lamps has a lamp support fixed inside the cylinder at one end.

[0012] The inner wall of the spiral flow controller is coated with a titanium dioxide coating, and a nano-titanium dioxide catalytic cylinder is inserted inside the cylinder.

[0013] This invention relates to a horizontal pipe filter. By incorporating a hydrodynamic component, it achieves dual hydrodynamic driving of the filter drum, eliminating the need for a motor drive and thus saving energy. Furthermore, by installing straight-line water jet spray pipes inside and outside the filter drum, it achieves dual water washing treatment of high-pressure backwashing and low-pressure rinsing of deposits on the filter drum. This reduces the amount of rinsing water and the pressure of subsequent wastewater treatment, resulting in better cleaning effect and higher cleaning efficiency, while also saving water, achieving the goals of self-cleaning and energy saving.

[0014] For rotating membrane bioreactors: By setting up a rotating membrane bioreactor, the biological rotating disc is driven by a hydrodynamic component, which simultaneously drives a large number of immobilized biological active packing materials to rotate in the contact reaction tank. This not only avoids the need to invest in motors, but also reduces the cost of investment, as there is no additional power consumption.

[0015] 1. Utilizing a hydrodynamic component to drive the rotating biological disc, which simultaneously rotates numerous immobilized biological active packing materials within the contact reaction tank, eliminates the need for a motor and reduces costs, eliminating additional power consumption. Furthermore, the inlet regulating valve on the inlet pipe allows for easy control of the rotating biological disc's speed by adjusting the inlet flow rate. This reactor features a simple structure, low energy consumption, ease of control, and convenient maintenance. 2. Compared to existing technologies, this method optimizes the traditional rotating biological disc process through microbial immobilization technology, avoiding drawbacks such as long start-up cycles, low treatment efficiency, and poor resistance to shock loads. It offers advantages such as high biofilm formation capacity, convenient processing, a rational structure, and easy installation and disassembly.

[0016] For ozone-UV sterilizers: By utilizing microbial immobilization technology, the traditional biological rotating disc process is optimized, avoiding drawbacks such as long start-up cycles, low treatment efficiency, and poor resistance to shock loads. This results in advantages such as large biofilm formation, convenient processing, reasonable structure, and easy installation and disassembly. By incorporating an ozone-UV sterilizer, UV sterilization and ozone sterilization are combined, simultaneously leveraging the advantages of both for dual sterilization, leading to better and more thorough disinfection. Furthermore, the addition of a shaftless spiral creates a swirling water flow, generating agitation. The impact of the water flow automatically cleans the quartz sleeve, reducing manual cleaning and saving production costs and installation space. Simultaneously, by disrupting the original water flow path and increasing the water's travel within the cylinder, the UV lamps' disinfection time is extended, improving disinfection effectiveness and sterilization efficiency, significantly enhancing usability and practicality.

[0017] 1. Combining ultraviolet (UV) and ozone (Ozone) sterilization allows for the simultaneous application of the advantages of both, achieving dual disinfection for better and more thorough results. 2. The addition of a shaftless spiral creates a swirling flow of water, generating agitation. The impact of the water flow automatically cleans the quartz sleeve, reducing manual cleaning and saving production costs and installation space. Simultaneously, by disrupting the original water flow path and increasing the water's travel within the cylinder, the UV lamps' disinfection time is extended, improving disinfection effectiveness and sterilization efficiency, significantly enhancing usability and practicality. 3. Its simple structure, reasonable design, dual disinfection effect, cost-effectiveness, and long service life meet the needs of recirculating aquaculture systems and have significant potential for widespread adoption. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a plan view of the internal structure of the horizontal tube filter of this utility model; Figure 3 This is a structural diagram of the filtration and backwashing unit in the horizontal pipe filter of this utility model; Figure 4 This is a front view of the horizontal pipe filter of this utility model; Figure 5 This is a front view of the rotating membrane bioreactor packing material of this utility model. Figure 6 This is a side view of the rotating membrane bioreactor packing material of this utility model. Figure 7 This is a front view of the rotating membrane bioreactor packing cylinder type membrane bioreactor of this utility model; Figure 8 This is a side view of the rotating membrane bioreactor packing cylinder type membrane bioreactor of this utility model; Figure 9 This is a side view of the cage-type membrane bioreactor packing material of the present invention. Figure 10 This is a front view of the cage-type membrane bioreactor packing material of the rotating membrane bioreactor of this utility model. Figure 11 This is a side sectional view of the single-tube ozone ultraviolet sterilizer of this utility model. Figure 12 This is a side cross-sectional view of the ozone ultraviolet sterilizer multi-tube sterilizer of this utility model. Figure 13 This is a second side cross-sectional view of the ozone ultraviolet sterilizer multi-tube sterilizer of this utility model. Figure 14This diagram illustrates the installation positions of the inlet and outlet water pipes of the ozone ultraviolet sterilizer of this utility model. Figure 1 ; Figure 15 This diagram illustrates the installation positions of the inlet and outlet water pipes of the ozone ultraviolet sterilizer of this utility model. Figure 2 ; Figure 16 This diagram illustrates the installation positions of the inlet and outlet water pipes of the ozone ultraviolet sterilizer of this utility model. Figure 3 . Detailed Implementation

[0019] like Figure 1 As shown, this utility model includes a horizontal pipe filter, a rotating membrane bioreactor, and an ozone ultraviolet sterilizer. The aquaculture water first undergoes primary filtration through the horizontal pipe filter, then undergoes biological aerobic purification through the rotating membrane bioreactor, and finally undergoes disinfection and sterilization purification through the ozone ultraviolet sterilizer; the water is then circulated into the aquaculture pond.

[0020] like Figure 2-4 The horizontal pipe filter includes a cylindrical body 100. An overflow pipe 105 is provided on one side of the upper end of the cylindrical body 100. A liquid level sensor 106 is built into the cylindrical body 100. A drain pipe 102 is provided at the bottom of the cylindrical body 100. A water outlet pipe A109 is installed inside the cylindrical body 100, with one end extending outward through the cylindrical body 100. A filter unit is rotatably connected to the outside of the water outlet pipe A109. A first impeller 107d is provided on the filter unit. An inlet distribution pipe 103 is installed inside the cylindrical body 100 on one side of the filter unit. An inlet pipe A101 is provided at the end of the inlet distribution pipe 103. The outlet end of the inlet distribution pipe 103 is on the same plane as the first impeller 107d. A flushing device is also installed on the cylindrical body 100. The rinsing unit is partially distributed within the outlet pipe 109 and the filter unit, while another part of the rinsing unit is located outside the cylinder 100. The rinsing unit located within the filter unit includes a blow pipe 113. The water flow sprayed through the inlet distribution pipe 103 impacts the first impeller 107d. When the first impeller 107d rotates, it drives the filter unit to rotate. The water filling the cylinder 100 is purified by the filter unit and discharged through the outlet pipe A109. When the purified water is discharged, part of the water flow is reinjected into the filter unit through the rinsing unit and rinsed from the inside out through the blow pipe 113. The outlet pipe 109 is equipped with an outlet valve 110, which is connected to the inlet pipe B of the rotating membrane bioreactor through a connecting pipe.

[0021] The filter unit includes a first filter cartridge 107, and the water outlet direction of the blow pipe 113 is directly opposite to the inner surface of the first filter cartridge 107. A bearing support seat is provided at the connection between the first filter cartridge 107 and the water outlet pipe 109. Support frames 107b are provided at both ends of the first filter cartridge 107, and a rotating frame 107a is connected between the support frames 107b. The rotating frames 107a are circumferentially distributed in a equidistant manner against the surface of the first filter cartridge 107.

[0022] The flushing unit includes a backwash water pump 111, and the input end of the backwash water pump 111 is connected to a backwash water supply pipe 114. The other end of the backwash water supply pipe 114 is connected to the outlet of the outlet pipe 109. The output end of the backwash water pump 111 is connected to a backwash water inlet pipe 112, and the backwash water inlet pipe 112 is inserted into the outlet pipe and concentric with the outlet pipe 109. The end of the backwash water inlet pipe 112 passes through the side of the outlet pipe 109 and is connected to the blow pipe 113.

[0023] The rotating membrane bioreactor includes a contact reaction tank 201. A rotating shaft 202 is centrally located on the upper surface of the contact reaction tank 201, and a bio-attachment chamber 203 is fixedly sleeved on the rotating shaft 202. The bio-attachment chamber 203 is filled with biospheres 204. A second impeller 215 is circumferentially positioned around one end of the bio-attachment chamber 203 around the rotating shaft 202. An inlet pipe B is located diagonally above the second impeller 215, and the inlet pipe B is connected to the outlet pipe A of a horizontal pipe filter. Water flows through the inlet pipe B and impacts the second impeller 215, thereby causing the bio-attachment chamber 203 to rotate uniformly within the contact reaction tank 201 with the rotating shaft 202 as the fulcrum. This exposes the decomposing bacteria attached to the biospheres 204 at the upper end of the bio-attachment chamber 203 to the air for respiration. The bottom of the contact reaction tank 201 is... The system includes a drain outlet 216 for discharging waste materials. A discharge pipe 206 is located at the top of the contact reaction tank 201, with one end inside the tank and the other outside, for connecting to an ozone ultraviolet sterilizer. A drain outlet 217 is located at the top of the contact reaction tank for connecting to the inlet pipe of the ozone ultraviolet sterilizer. The bio-attachment chamber 203 includes multiple packing discs 207, which are equidistantly mounted on a rotating shaft 202. Each disc is hollow, and bio-balls 204 are placed inside it. Each packing disc 207 has an annular, dish-shaped structure, and its end is threaded with a matching sealing cap. Water-permeable holes are evenly distributed on the surfaces of both the packing disc 207 and the sealing cap.

[0024] The bio-attachment chamber 203 includes multiple packing cylinders 208 arranged circumferentially around a rotating shaft 202, and a first connecting plate 209 is symmetrically sleeved on the rotating shaft 202. The first connecting plate 209 has uniformly opened insertion holes for inserting the packing cylinders 208. Bio-balls 204 are placed inside the packing cylinders 208. The ends of the packing cylinders 208 are threadedly connected to end caps, and the surfaces of the packing cylinders 208 and the end caps are uniformly opened with water-permeable holes. A first reinforcing plate 210 is sleeved at the center of the packing cylinders 208, and the structure of the first reinforcing plate 210 is the same as that of the first connecting plate 209.

[0025] The bio-attachment chamber 203 also includes a packing cage 211 disposed outside the rotating shaft 202. The two ends of the packing cage 211 are fixedly connected to a second connecting plate 212, and the second connecting plate 212 is sleeved on the rotating shaft 202. The middle part of the packing cage 211 is fixedly sleeved with a second reinforcing plate 213, and a screw is provided between the second connecting plate 212 and the second reinforcing plate 213 for tension. One end of the packing cage 211 is provided with a packing inlet and outlet 214 around the rotating shaft 202. Bio-balls 204 are filled or discharged from the packing cage 211 through the packing inlet and outlet 214. A sealing plug is provided on the packing inlet and outlet 214.

[0026] The ozone ultraviolet sterilizer includes an outer cylinder 301, with a connecting flange 302 at one end. An aeration disc 303 is installed inside the connecting flange 302, and an air pipe 304 is mounted on the aeration disc 303. The air pipe 304 passes through the connecting flange 302 and connects to an external air supply device. A spiral flow controller 305 is installed inside the outer cylinder 301, and a germicidal lamp 306 is arranged around the spiral flow controller 305. A water inlet pipe C is provided at one end of the outer cylinder 301 for connecting to the drain outlet 2016 of the contact reaction tank 201. Furthermore, an outlet pipe C is installed at the other end of the outer cylinder 301, and a flow sensor 309 is mounted on the inlet pipe C. Water filling the outer cylinder 301 through the inlet pipe C is blocked by the spiral flow controller 305 to form a slow flow, thereby extending the residence time of the water in the outer cylinder 301 and allowing it to be fully irradiated by the germicidal lamp 306. The inlet pipe is located on the upper surface of the outer cylinder 301, and the outlet pipe C is located on the lower surface, side, or upper surface of the outer cylinder 301, thereby forming a 0°, 90°, or 180° clamp between the inlet pipe C and the outlet pipe C. The spiral flow controller 305 includes a first shaftless spiral blade 3051, which is installed along the transverse central axis of the outer cylinder 301. Water filling the outer cylinder 301 through the water inlet pipe C is slowed down by the first shaftless spiral blade 3051 and forms a swirling flow. When the spiral flow controller 305 is the first shaftless spiral blade 3051, its germicidal lamp 306 includes a first ozone ultraviolet lamp tube 3061, which passes through the central axis of the first shaftless spiral blade 3051. The wire is placed inside the first shaftless spiral plate 3051, and one end of the first ozone ultraviolet lamp tube 3061 is provided with a lamp tube support 307 to fix it inside the outer cylinder 301; the germicidal lamp 306 also includes a second ozone ultraviolet lamp tube 3062, and multiple second ozone ultraviolet lamp tubes 3062 are provided, and the multiple second ozone ultraviolet lamp tubes 3062 are arranged in a circular and equidistant manner around the first shaftless spiral plate 3051 inside the outer cylinder 301, and one end of the second ozone ultraviolet lamp tube 3062 is provided with a lamp tube support 307 for fixing.

[0027] The spiral flow controller 305 can also employ a first shaftless spiral blade 3051 and a second shaftless spiral blade 3052. The first shaftless spiral blade 3051 is installed along the transverse central axis of the outer cylinder 301, and the second shaftless spiral blade 3052 is sleeved outside the first shaftless spiral blade 3051. The first shaftless spiral blade 3051 and the second shaftless spiral blade 3052 are coaxially arranged inside the outer cylinder 301, and space is left between the first shaftless spiral blade 3051 and the second shaftless spiral blade 3052. When the spiral flow controller 305 is composed of a first shaftless spiral blade 3051 and a second shaftless spiral blade 3052, its germicidal lamp 306 includes a first ozone ultraviolet lamp tube 3061, a second ozone ultraviolet lamp tube 3062, and a third ozone ultraviolet lamp tube 3063. The first ozone ultraviolet lamp 3061 passes through the central axis of the first shaftless spiral plate 3051 and is placed inside the first shaftless spiral plate 3051. The second ozone ultraviolet lamp 3062 is located between the first shaftless spiral plate 3051 and the second shaftless spiral plate 3052, and the second ozone ultraviolet lamp 3062 is arranged in a circumferential equidistant pattern around the first shaftless spiral plate 3051 inside the outer cylinder 301. The third ozone ultraviolet lamp 3063 is arranged in a circumferential equidistant pattern around the second shaftless spiral plate 3052 inside the outer cylinder 301. Each of the first ozone ultraviolet lamp 3061, the second ozone ultraviolet lamp 3062, and the third ozone ultraviolet lamp 3063 is provided with a lamp support 307 and fixed inside the outer cylinder 301.

[0028] The inner wall of the spiral flow controller 305 is coated with a titanium dioxide coating, and a nano-titanium dioxide catalytic cylinder 308 is sleeved inside the outer cylinder 301.

[0029] The treatment method of the energy-saving circulating water treatment system for factory-scale aquaculture is as follows: S1: The aquaculture water first enters the water distribution pipe through the water inlet pipe, and is sprayed by the water spray elbow at the end of the water distribution pipe to the first impeller, which drives the first impeller to rotate. The first impeller drives the first filter cartridge to rotate. At the same time, the aquaculture water sprayed from the water spray elbow directly enters the cylinder 100. S2: The aquaculture water inside the cylinder 100 undergoes primary filtration through the first filter cartridge. The primary filtered water entering the first filter cartridge flows into the next process through the outlet pipe. Meanwhile, large particles of fish food and feces in the aquaculture water are separated from the outer periphery of the first filter cartridge and eventually fall below the cartridge 100 and are discharged outside the cartridge 100 through the sewage pipe. After step S2, after the first filter cartridge has been filtered for a period of time, a layer of impurities will be attached to the outer surface of the first filter cartridge, causing the first filter cartridge to be blocked. Therefore, the backwash water pump is turned on, and the water after primary purification is introduced through the backwash water pump and delivered to the backwash water inlet pipe. The flushing water enters the blow pipe through the backwash water inlet pipe, thereby flushing the first filter cartridge from the inside out. This backflush action is activated intermittently, depending on the actual filtration situation.

[0030] S3: The primary filtered water flowing out of the outlet pipe in step S2 enters the inlet pipe B of the rotating membrane bioreactor through a pipeline. The inlet pipe B impacts the second impeller 215 of the rotating membrane bioreactor. The second impeller 215 rotates under the action of hydrodynamic force, which drives the rotating shaft 202 to rotate. The rotating shaft 202 further drives the multiple bio-attachment chambers 203 on the rotating shaft 202 to rotate. The bio-attachment chambers 203 rotate at a constant speed in the contact reaction tank 201 with the rotating shaft 202 as the fulcrum. This allows the decomposing bacteria attached to the biospheres 204 at the upper end of the bio-attachment chambers 203 to be exposed to the air for respiration. Furthermore, the biospheres 204 at the lower end of the bio-attachment chambers 203, which are submerged in the water, purify the ammonia nitrogen in the water. S4: The aquaculture water after secondary purification enters the ozone ultraviolet sterilizer through the discharge pipe B206 at the top of the contact reaction tank 201 for disinfection, while impurities and sediments are discharged from the drain outlet at the bottom of the contact reaction tank 201. S5: The secondary purified water entering the ozone ultraviolet sterilizer fills the outer cylinder 301 of the ozone ultraviolet sterilizer. After being blocked and slowed down by the first shaftless spiral blade 3051, it forms a swirling flow and generates agitation. The impact of the water flow cleans the quartz sleeve. At the same time, it disrupts the original water flow path and increases the water flow's journey in the outer cylinder 301. Under the ultraviolet light irradiation of the first ozone ultraviolet lamp tube 3061, it undergoes sterilization and disinfection treatment. S6: Furthermore, the inner wall of the spiral flow controller 305 is coated with a titanium dioxide coating, and the titanium dioxide catalytic cylinder and the titanium dioxide react synergistically with ozone under ultraviolet photocatalysis to generate active oxygen species through multiple mechanisms to oxidize and degrade organic pollutants. S7: After three-stage purification, the aquaculture water is controlled by the flow sensor 309 on the outlet pipe C to control the flow rate and purification time. Then it is circulated back into the aquaculture pond to achieve three-stage purification.

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] The aquaculture water in the ponds first undergoes primary filtration treatment through a horizontal pipe filter, such as... Figure 2-4As shown, an overflow pipe 105 is provided on one side of the upper end of the outer cylinder 301, and a liquid level sensor 106 is built into the outer cylinder 301. A drain pipe 102 is provided at the bottom of the outer cylinder 301, and a water outlet pipe 109 is provided inside the outer cylinder 301. One end of the water outlet pipe 109 extends outward through the outer cylinder 301, and a filter unit is rotatably connected to the outside of the water outlet pipe 109. A first impeller 107d is provided on the filter unit, and a water inlet distribution pipe 103 is installed inside the outer cylinder 301 on one side of the filter unit. A water inlet pipe 101 is provided at the end of the water inlet distribution pipe 103, and the water outlet end of the water inlet distribution pipe 103 is on the same plane as the first impeller 107d. The outer cylinder 301 is also equipped with a rinsing unit, which is partially distributed in the outlet pipe 109 and the filter unit. Another part of the rinsing unit is located outside the outer cylinder 301. The rinsing unit located in the filter unit includes a blow pipe 113. The water flow sprayed through the inlet distribution pipe 103 impacts the first impeller 107d. When the first impeller 107d rotates, it drives the filter unit to rotate. The water filling the outer cylinder 301 is purified by the filter unit and discharged through the outlet pipe 109. When the purified water is discharged, part of the water flow is reinjected into the filter unit through the rinsing unit and rinsed from the inside out through the blow pipe 113.

[0033] In order to ensure that the water flow sprayed through the water inlet distribution pipe 103 can better impact the first impeller 107d, the direction of the water flow must be at a certain angle to the first impeller 107d. Therefore, in this embodiment, a water inlet pipe 101 is connected to the outer end of the water inlet distribution pipe 103, and a water spray elbow 108 is sleeved on the inner end of the water inlet distribution pipe 103. The port of the water spray elbow 108 faces the filter unit, and the angle between the water spray elbow 108 and the side of the filter unit is an acute angle. The angle of the water flow sprayed from the water inlet distribution pipe 103 can be adjusted by using the water spray elbow 108, so that the water flow can better impact the first impeller 107d, thereby driving the first impeller 107d to rotate.

[0034] By designing a flushing unit and a blowpipe, the filter achieves internal to external flushing, reducing the frequency and difficulty of manual cleaning and extending the filter's service life. The water flow from the inlet distribution pipe impacts the impeller, generating power to automatically rotate the filter unit without requiring an additional power source, thus saving energy. The rotation of the filter unit prevents impurities from accumulating on the filter screen surface, maintaining filtration efficiency. At the same time, the rotational motion helps to evenly distribute the filtration pressure. It can be configured with single-cylinder or double-cylinder filter units to adapt to different water qualities and filtration needs, increasing the equipment's versatility. Some of the purified water is reused to flush the filter unit, improving water resource utilization efficiency.

[0035] (2) High-pressure backwashing treatment of the filter screen rollers is achieved by the blow pipe, which reduces the amount of flushing water and the pressure of subsequent tailwater treatment, resulting in better cleaning effect and higher cleaning efficiency. Furthermore, the effective filtration area is large and the filtration volume is large, thereby improving the filtration efficiency, greatly reducing the discharge of aquaculture tailwater, realizing the reuse of aquaculture tailwater, fundamentally solving the problem of aquaculture tailwater recycling, facilitating operation and maintenance, ensuring treatment effect while greatly reducing equipment usage costs, occupying less space, consuming less energy, having low electricity costs, and being easy to install without professional personnel, making it easy to widely promote and effectively meet usage needs.

[0036] After primary filtration by a horizontal tube filter, the material undergoes biological aerobic purification in a rotating membrane bioreactor. Figure 4-12 As shown, the rotating membrane bioreactor employs two embodiments: Example 1: like Figure 5-6 As shown, the bio-attachment chamber 203 of this embodiment includes multiple packing discs 207. The packing discs 207 are equidistantly sleeved on the rotating shaft 202, thereby stimulating the second impeller 215 through water flow. The second impeller 215 further drives the rotating shaft 202 to rotate, achieving uniform rotation of the packing discs 207. The packing discs 207 have an annular, dish-like structure and are hollow inside, facilitating the placement of bio-balls 204 within them. The bio-balls 204 are porous or perforated spheres, thus increasing their surface area. This facilitates the attachment of nitrifying bacteria and increases the biofilm formation rate. Furthermore, to ensure that the bio-balls 204 do not fall off when the packing disc 207 rotates, this embodiment has a matching sealing cap threadedly connected to the end of the packing disc 207. The sealing cap seals the opening of the packing disc 207. Moreover, in order to ensure that the bio-balls 204 inside the packing disc 207 can fully contact the water in the contact reaction tank 201 to purify the ammonia nitrogen in the water, this embodiment has water-permeable holes evenly opened on the surface of the packing disc 207 and the sealing cap.

[0037] Example 2: like Figure 7 , Figure 8As shown, the bio-attachment chamber 203 of this embodiment includes multiple packing cylinders 208 arranged circumferentially around a rotating shaft 202. A first connecting plate 209 is symmetrically sleeved on the rotating shaft 202. The first connecting plate 209 has uniformly distributed insertion holes for inserting the packing cylinders 208. End caps are threaded to the ends of the packing cylinders 208, and water-permeable holes are uniformly distributed on the surfaces of the packing cylinders 208 and the end caps. A first reinforcing plate 210 is sleeved at the center of the packing cylinder 208, and the structure of the first reinforcing plate 210 is the same as that of the first connecting plate 209. In this embodiment, bio-balls 204 are placed inside the packing cylinders 208, and the end caps are used to support the packing cylinders 208. The openings are sealed, and each packing cylinder 208 is an independent unit, which facilitates the treatment or replacement of the bio-balls 204 in a specific packing cylinder 208 as needed. Alternatively, when the nitrifying bacteria on the bio-balls 204 in one packing cylinder 208 change, it will not affect the nitrifying bacteria in other packing cylinders 208. Furthermore, using multiple packing cylinders 208 to load bio-balls 204 can, to some extent, avoid the situation where the nitrifying bacteria on the central bio-balls 204 cannot fully contact oxygen and ammonia nitrogen in the water due to the stacking of bio-balls 204. The packing disc 207 mentioned above also has this function.

[0038] exist Figure 9-10 In this embodiment, the bio-attachment chamber 203 also includes a packing cage 211 disposed outside the rotating shaft 202. The two ends of the packing cage 211 are fixedly connected to a second connecting plate 212, and the second connecting plate 212 is sleeved on the rotating shaft 202. The middle part of the packing cage 211 is fixedly sleeved with a second reinforcing plate 213, and a screw is provided between the second connecting plate 212 and the second reinforcing plate 213 for reinforcement. One end of the packing cage 211 is provided with a packing inlet and outlet 214 around the rotating shaft 202. Bio-balls 204 are filled or discharged from the packing cage 211 through the packing inlet and outlet 214. A sealing plug is provided on the packing inlet and outlet 214. In this embodiment, the bio-balls 204 are filled in the packing cage 211. The packing cage 211 rotates in the contact reaction tank 201 as the second impeller 215 rotates, so that the bio-balls 204 in the packing cage 211 intermittently contact water and air, thereby purifying ammonia nitrogen in the aquaculture wastewater under the premise of reducing operating costs.

[0039] In the rotating membrane bioreactor, a hydrodynamic component drives the rotating biological disc to rotate, thereby simultaneously rotating numerous immobilized biological active packing materials in the contact reaction tank 201. This not only avoids the need for a motor but also reduces costs, as there is no additional power consumption. Furthermore, since an inlet regulating valve is installed on the inlet pipe, the rotation speed of the biological disc can be easily controlled by adjusting the inlet flow rate. The reactor has a simple structure, low energy consumption, is easy to control, and is convenient to maintain.

[0040] Compared with existing technologies, rotating disc membrane bioreactors optimize the traditional rotating biological process through microbial immobilization technology, avoiding the disadvantages of long start-up cycles, low treatment efficiency, and poor resistance to shock loads. This gives them the advantages of large biofilm formation, convenient processing, reasonable structure, and easy installation and disassembly.

[0041] Rotating membrane bioreactors have a large effective filtration area and large filtration capacity, thereby improving filtration efficiency, greatly reducing the discharge of aquaculture wastewater, and realizing the reuse of aquaculture wastewater. This fundamentally solves the problem of recycling aquaculture wastewater, is easy to operate and maintain, and greatly reduces equipment operating costs while ensuring treatment effects. It also has a smaller footprint, low energy consumption, low electricity costs, and is easy to install without the need for professional personnel. It is easy to promote widely and effectively meet the needs of users.

[0042] Afterwards, it undergoes disinfection, sterilization, and purification using an ozone ultraviolet sterilizer; such as Figure 11-16 As shown, the spiral flow controller 305 in this embodiment includes a first shaftless spiral blade 3051, which is installed along the transverse central axis of the outer cylinder 301. Water filling the outer cylinder 301 through the water inlet pipe 101 is slowed down by the first shaftless spiral blade 3051 and forms a swirling flow. Furthermore, when the spiral flow controller 305 is the first shaftless spiral blade 3051, its germicidal lamp 306 includes a first ozone ultraviolet lamp tube 3061. In this embodiment, the first ozone ultraviolet lamp tube 3061 passes through the central axis of the first shaftless spiral blade 3051 and is placed inside the first shaftless spiral blade 3051, so that the ultraviolet light of the first ozone ultraviolet lamp tube 3061 can be evenly scattered to the surroundings, so that the water in the outer cylinder 301 is evenly irradiated with ultraviolet light. One end of the first ozone ultraviolet lamp tube 3061 is provided with a lamp tube support 307 to fix it inside the outer cylinder 301.

[0043] exist Figure 12 In this embodiment, the germicidal lamp 306 also includes a second ozone ultraviolet lamp tube 3062. Multiple second ozone ultraviolet lamp tubes 3062 are provided, and the multiple second ozone ultraviolet lamp tubes 3062 are arranged in a circumferential and equidistant manner around the first shaftless spiral plate 3051 inside the outer cylinder 301. One end of the second ozone ultraviolet lamp tube 3062 is provided with a lamp tube support 307 for fixing. In this embodiment, the first ozone ultraviolet lamp tube 3061 and the second ozone ultraviolet lamp tube 3062 form a multi-layer lamp tube, ensuring that the water flow is irradiated from multiple angles, eliminating dead corners, and achieving a more thorough disinfection and sterilization effect.

[0044] exist Figure 13In this embodiment, the spiral flow controller 305 includes a first shaftless spiral blade 3051 and a second shaftless spiral blade 3052. The first shaftless spiral blade 3051 is installed along the transverse central axis of the outer cylinder 301, and the second shaftless spiral blade 3052 is sleeved outside the first shaftless spiral blade 3051. The first shaftless spiral blade 3051 and the second shaftless spiral blade 3052 are coaxially arranged inside the outer cylinder 301, and there is space between the first shaftless spiral blade 3051 and the second shaftless spiral blade 3052. In this embodiment, the added second shaftless spiral blade 3052 causes the water flow to form a swirling flow, generating a stirring force. Utilizing the impact of the water flow, the flow is effectively... The current cleaning of the quartz sleeve reduces the number of manual cleaning operations, saving production costs and installation space. Simultaneously, by disrupting the original water flow path and increasing the water's travel distance within the outer cylinder 301, the disinfection time of the germicidal lamp 306 is extended, improving the disinfection effect and sterilization efficiency, significantly enhancing its effectiveness and practicality. Furthermore, when the spiral flow controller 305 consists of a first shaftless spiral blade 3051 and a second shaftless spiral blade 3052, its germicidal lamp 306 includes a first ozone ultraviolet lamp 3061, a second ozone ultraviolet lamp 3062, and a third ozone ultraviolet lamp 3063, wherein the first ozone ultraviolet lamp... An outer lamp 3061 passes through the central axis of the first shaftless spiral plate 3051 and is positioned inside the first shaftless spiral plate 3051. A second ozone ultraviolet lamp 3062 is located between the first shaftless spiral plate 3051 and the second shaftless spiral plate 3052, and the second ozone ultraviolet lamp 3062 is arranged in a circumferentially equidistant manner around the first shaftless spiral plate 3051 within the outer cylinder 301. A third ozone ultraviolet lamp 3063 is arranged in a circumferentially equidistant manner around the second shaftless spiral plate 3052 within the outer cylinder 301. The first ozone ultraviolet lamp 3061, the second ozone ultraviolet lamp 3062, and the third ozone ultraviolet lamp 3063 are arranged in a circumferentially equidistant manner within the outer cylinder 301. Each of the three lamps is fixed inside the outer cylinder 301 with a lamp support 307 at one end. In this embodiment, the first ozone ultraviolet lamp 3061, the second ozone ultraviolet lamp 3062, and the third ozone ultraviolet lamp 3063 form a multi-layer lamp to ensure that the water flow is irradiated from multiple angles, eliminating dead corners and achieving a more thorough disinfection and sterilization effect. Secondly, the first ozone ultraviolet lamp 3061, the second ozone ultraviolet lamp 3062, and the third ozone ultraviolet lamp 3063 slow down the water flow to a certain extent, thereby further extending the residence time of the water flow in the outer cylinder 301, optimizing the sterilization efficiency, and making the disinfection of the germicidal lamp 306 more thorough.

[0045] In this embodiment, the lamp support 307 is fixed to one end of the outer cylinder 301. The lamp support 307 not only ensures that the germicidal lamp 306 can be fixedly installed inside and outside the outer cylinder 30110, but also serves to connect the wires.

[0046] exist Figure 14-16In this design, the inlet pipe C is located on the upper surface of the outer cylinder 301, while the outlet pipe C is located on the lower, side, or upper surface of the outer cylinder 301. This allows the inlet pipe C and outlet pipe C to form angles of 0°, 90°, or 180°, enabling the outlet pipe C to be positioned at different angles to adapt to various installation environments and pipe connection requirements. Furthermore, the installation position of the outlet pipe C varies. When a 0° angle is formed, the outer cylinder 301 is completely filled with water, eliminating air bubbles and making it suitable for situations requiring complete immersion disinfection. When a 90° angle is formed, a certain gas phase space is created in the upper part of the outer cylinder 301, ensuring sufficient liquid contact area and enhancing the treatment capacity for volatile organic compounds, particularly effective when ozone is present. When a 180° angle is formed, gravity enhances the rotational motion of the water flow through the spiral flow controller 305, and the water flows from top to bottom along the longest path, extending the ultraviolet irradiation time and improving disinfection efficiency.

[0047] By combining ultraviolet (UV) sterilization with ozone sterilization, the ozone UV sterilizer can simultaneously leverage the advantages of both UV and ozone sterilization, achieving dual disinfection for better and more thorough results. This meets the needs of recirculating aquaculture systems. Furthermore, the integration of the lamp tube and the spiral flow controller 305 saves space and makes the overall design more compact, achieving a balance between disinfection effectiveness and energy utilization. It also solves the cleaning and maintenance difficulties associated with traditional disinfection equipment.

[0048] The ozone ultraviolet sterilizer incorporates a shaftless spiral, creating a swirling water flow that generates agitation. This water flow's impact automatically cleans the quartz sleeve, reducing manual cleaning and saving production costs and installation space. Simultaneously, by disrupting the original water flow path and increasing the water's travel within the outer cylinder 301, the ultraviolet lamps' disinfection time is extended, improving disinfection effectiveness and sterilization efficiency, significantly enhancing its usability and practicality.

[0049] The ozone ultraviolet sterilizer features a multi-layered ozone ultraviolet lamp tube with equidistant circumferential arrangement, ensuring that the water flow receives irradiation from multiple angles, eliminating dead corners and achieving a more thorough disinfection and sterilization effect. Furthermore, the titanium dioxide coating generates a photocatalytic effect under ultraviolet irradiation, enhancing the disinfection effect and decomposing organic pollutants. Moreover, the inlet and outlet water pipes can be formed at different angles to adapt to various installation environments and pipe connection requirements.

[0050] Under the guiding effect of the shaftless spiral, a vortex is formed, which self-cleans the quartz sleeve. At the same time, under the action of dual-band ozone ultraviolet light, the aquaculture tail water is doubly disinfected. The disinfected clean water is discharged from the outlet and flows into the aquaculture pond for recycling.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. An energy-saving circulating water purification system for factory-scale aquaculture, characterized in that: The system includes a horizontal pipe filter, a rotating membrane bioreactor, and an ozone ultraviolet sterilizer. The aquaculture water first undergoes primary filtration through the horizontal pipe filter, then biological aerobic purification through the rotating membrane bioreactor, and finally disinfection and sterilization through the ozone ultraviolet sterilizer; the water is then circulated into the aquaculture pond. The horizontal pipe filter includes a cylindrical body with an overflow pipe on one side of its upper end and a built-in liquid level sensor. A drain pipe is located at the bottom of the cylindrical body. An outlet pipe A is installed inside the cylindrical body, with one end of A extending outwards through the body. A filter unit is rotatably connected to the outlet pipe A, and a first impeller is mounted on the filter unit. An inlet distribution pipe is installed inside the cylindrical body on one side of the filter unit, with its outer end connected to the inlet pipe A. A spray elbow is fitted onto the inner end of the inlet distribution pipe, with the spray elbow facing the filter unit and forming an acute angle between the spray elbow and the side of the filter unit. The outlet end of the inlet distribution pipe is connected to the first impeller. On the same plane, a rinsing unit is also installed on the cylinder, with the rinsing unit partially distributed in the outlet pipe A and the filter unit, and another part of the rinsing unit located outside the cylinder. The rinsing unit located inside the filter unit includes a blow pipe. The water flow sprayed through the inlet distribution pipe impacts the first impeller. When the first impeller rotates, it drives the filter unit to rotate. The water filling the cylinder is purified by the filter unit and discharged through the outlet pipe A. When the purified water is discharged, part of the water flow is reinjected into the filter unit through the rinsing unit and rinsed from the inside out through the blow pipe. The outlet pipe A is equipped with an outlet valve, which is connected to the inlet pipe of the rotating membrane bioreactor through a connecting pipe. The rotating membrane bioreactor includes a contact reaction tank. A rotating shaft is centrally located on the upper surface of the contact reaction tank, and a bio-attachment chamber is fixedly fitted onto the shaft. The bio-attachment chamber is filled with biospheres. A second impeller is arranged circumferentially around one end of the bio-attachment chamber, and an inlet pipe B is located diagonally above the second impeller. Inlet pipe B is connected to the outlet pipe of a horizontal pipe filter. Water flows through inlet pipe B and impacts the second impeller, causing the bio-attachment chamber to rotate uniformly within the contact reaction tank around the rotating shaft. This exposes the decomposing bacteria attached to the biospheres at the upper end of the bio-attachment chamber to the air for respiration. A discharge pipe is located at the top of the contact reaction tank, with one end inside the tank and the other end outside, for connecting to an ozone ultraviolet sterilizer. A drain outlet is also located at the top of the contact reaction tank. The drain outlet is used to connect to the inlet pipe of the ozone ultraviolet sterilizer; the bio-attachment chamber includes multiple packing discs, which are equidistantly sleeved on the rotating shaft. The packing discs are hollow inside, and the bio-balls are placed inside the packing discs; the packing discs have an annular dish-shaped structure, and the ends of the packing discs are threadedly connected to matching sealing caps, and the surfaces of the packing discs and sealing caps are evenly provided with permeable holes; the bio-attachment chamber includes multiple packing cylinders distributed circumferentially around the rotating shaft, and a first connecting plate is symmetrically sleeved on the rotating shaft. The first connecting plate is evenly provided with insertion holes for the packing cylinders to be inserted, and the bio-balls are placed inside the packing cylinders; the ends of the packing cylinders are threadedly connected to end caps, and the surfaces of the packing cylinders and end caps are evenly provided with permeable holes. A first reinforcing plate is sleeved at the center of the packing cylinder, and the structure of the first reinforcing plate is the same as that of the first connecting plate. The ozone ultraviolet sterilizer includes an outer cylinder with a connecting flange at one end. An aeration disc is installed inside the connecting flange, and an air pipe is mounted on the aeration disc, passing through the connecting flange and connected to an external air supply device. A spiral flow controller is installed inside the outer cylinder, and a germicidal lamp is arranged around the spiral flow controller. One end of the outer cylinder has an inlet pipe C for connecting to the outlet pipe of the contact reaction tank, and the other end has an outlet pipe C. A flow controller is mounted on the outlet pipe C. Water filling the outer cylinder through the inlet pipe C is slowed down by the spiral flow controller, thus extending the water's residence time in the outer cylinder and allowing it to fully receive irradiation from the germicidal lamp. The inlet pipe C is located on the upper surface of the outer cylinder, and the outlet pipe C is located on the lower, side, or upper surface of the outer cylinder, thus forming a 0° or 90° angle between the inlet pipe C and the outlet pipe C. Or an included angle of 180°; the spiral flow controller includes a first shaftless spiral blade, which is installed along the transverse central axis of the outer cylinder. Water filling the outer cylinder through the water inlet pipe C is slowed down by the first shaftless spiral blade and forms a swirling flow; when the spiral flow controller is a first shaftless spiral blade, its germicidal lamp includes a first ozone ultraviolet lamp tube, which passes through the central axis of the first shaftless spiral blade and is placed inside the first shaftless spiral blade. One end of the first ozone ultraviolet lamp tube is provided with a lamp tube support to fix it inside the outer cylinder; the germicidal lamp also includes a second ozone ultraviolet lamp tube, and multiple second ozone ultraviolet lamp tubes are provided. The multiple second ozone ultraviolet lamp tubes are arranged in a circular and equidistant manner around the first shaftless spiral blade inside the cylinder. One end of the second ozone ultraviolet lamp tube is provided with a lamp tube support for fixing.

2. The energy-saving circulating water purification system for factory-scale aquaculture according to claim 1, characterized in that: The filtration unit includes a first filter cartridge, and the water outlet direction of the blow pipe is directly opposite to the inner surface of the first filter cartridge. A bearing support seat is provided at the connection between the first filter cartridge and the water outlet pipe. Support frames are provided at both ends of the first filter cartridge, and a rotating frame is connected between the support frames. The rotating frame is circumferentially distributed in a equidistant manner against the surface of the first filter cartridge.

3. The energy-saving circulating water purification system for factory-scale aquaculture according to claim 2, characterized in that: The flushing unit includes a backwash water pump, and the input end of the backwash water pump is connected to a backwash water supply pipe. The other end of the backwash water supply pipe is connected to the outlet of the outlet pipe A. The output end of the backwash water pump is connected to a backwash water inlet pipe, and the backwash water inlet pipe is inserted into the outlet pipe and concentric with the outlet pipe A. The end of the backwash water inlet pipe passes through the side of the outlet pipe A and is connected to the blowpipe.

4. The energy-saving circulating water purification system for factory-scale aquaculture according to claim 1, characterized in that: The bio-attachment chamber also includes a packing cage disposed outside the rotating shaft. The two ends of the packing cage are fixedly connected to a second connecting plate, which is sleeved on the rotating shaft. A second reinforcing plate is fixedly sleeved in the middle of the packing cage, and a screw is provided between the second connecting plate and the second reinforcing plate for reinforcement. One end of the packing cage is provided with a packing inlet and outlet around the rotating shaft. Bio-balls are filled into or discharged from the packing cage through the packing inlet and outlet. A sealing plug is provided on the packing inlet and outlet.

5. The energy-saving circulating water purification system for factory-scale aquaculture according to claim 1, characterized in that: The spiral flow controller can also employ a first shaftless spiral blade and a second shaftless spiral blade. The first shaftless spiral blade is installed along the transverse central axis of the outer cylinder, and the second shaftless spiral blade is sleeved outside the first shaftless spiral blade. The first and second shaftless spiral blades are coaxially arranged inside the outer cylinder, with space between them. When the spiral flow controller uses a first shaftless spiral blade and a second shaftless spiral blade, its germicidal lamp includes a first ozone ultraviolet lamp, a second ozone ultraviolet lamp, and a third ozone ultraviolet lamp. The first ozone ultraviolet lamp tube passes through the central axis of the first shaftless spiral plate and is placed inside the first shaftless spiral plate. The second ozone ultraviolet lamp tube is located between the first and second shaftless spiral plates, and the second ozone ultraviolet lamp tubes are arranged in a circumferential equidistant pattern around the first shaftless spiral plate inside the cylinder. The third ozone ultraviolet lamp tubes are arranged in a circumferential equidistant pattern around the second shaftless spiral plate inside the outer cylinder. Each of the first, second, and third ozone ultraviolet lamp tubes has a lamp tube support fixed inside the outer cylinder at one end.

6. The energy-saving circulating water purification system for factory-scale aquaculture according to claim 1, characterized in that: The inner wall of the spiral flow controller is coated with a titanium dioxide coating, and a nano-titanium dioxide catalytic cylinder is inserted inside the cylinder.

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