Integrated method and system for breeding tail water circulation treatment

Abstract

The present application relates to wastewater multistage treatment technical field, especially to a kind of integrated method of aquaculture tail water circulation processing, after collecting tail water, using microfilter to carry out initial filtration and obtain initial filtration water;Fine suspended particles, colloidal substance in initial filtration water are separated using air floatation tank;Multiple multi-cell SBR is constructed, and the initial filtration water after air floatation is biologically treated to obtain biochemical treatment water;Biochemical treatment water is obtained at the same time, and sludge in multi-cell SBR is transported to sludge thickening tank, and supernatant after thickening is input into multi-cell SBR for biological treatment again;Biochemical treatment water is disinfected in disinfection tank to obtain recycled water.Water body is treated using multi-cell SBR, which not only can achieve the purpose of efficient denitrification and phosphorus removal, but also can use the cell room in series, so that water body is transferred and reacted between multiple cell rooms, forming multiple treatment stages, effectively buffering the impact of water body, and solving the problems of large occupation, low efficiency and poor fluctuation adaptation of traditional aquaculture tail water treatment.

Description

Technical Field

[0001] This invention relates to the field of multi-stage wastewater treatment technology, and in particular to an integrated method and system for recycling aquaculture wastewater. Background Technology

[0002] Aquaculture ponds are artificially constructed water bodies whose main function is to provide a controllable living and growth environment for aquatic economic plants and animals (such as fish, shrimp, and crabs), facilitating intensive and high-density aquaculture and thus achieving stable and efficient aquatic product production. During the aquaculture process, wastewater (tailwater) mainly consists of nutrient-rich substances such as uneaten feed, fish excrement, plankton metabolites, drug residues, and organic matter decomposition products that accumulate in the pond water, along with discharge from water exchange, pond cleaning, and other management operations. To prevent the direct discharge of eutrophic wastewater from polluting surrounding water bodies, disrupting the ecological balance, and causing environmental disasters such as red tides, it is necessary to treat the tailwater. After treatment, the tailwater meets environmental protection standards and is then recycled to ensure the sustainable development of aquaculture itself.

[0003] The current mainstream technologies are mainly the "three ponds and two dams" and its enhanced version, the "four ponds and three dams" ecological purification process. These technologies rely on physical sedimentation, biodegradation, and ecological purification to reduce pollutants. Their advantages include the use of earthen ponds for renovation, simple structure, and no need for large amounts of reinforced concrete; operation relies on natural ecological processes, and daily maintenance is simple; and virtually no chemical agents are added. However, this technology also has very obvious disadvantages. First, aquaculture wastewater discharge is intermittent, with large instantaneous flow rates and fluctuating pollutant concentrations with the aquaculture cycle. Current technologies cannot simultaneously guarantee stable resistance to shock loads and efficient deep nitrogen and phosphorus removal capabilities. Second, there are technical problems such as increased construction and operation complexity and costs, and higher design and management requirements. Summary of the Invention

[0004] This invention provides an integrated method and system for the recycling and treatment of aquaculture wastewater, in order to address the issues raised in the background art.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solution: an integrated method for the recycling and treatment of aquaculture wastewater, comprising the following steps: After collecting the wastewater, a microfiltration machine is used for primary filtration to obtain pre-filtered water. The air flotation tank is used to separate fine suspended particles and colloidal substances in the primary filtered water; Multiple multi-chamber SBRs were constructed to biologically treat the initial filtrate after air flotation to obtain biochemically treated water. While obtaining biochemically treated water, the sludge in the multi-chamber SBR is transported to the sludge thickening tank, and the concentrated supernatant is reintroduced into the multi-chamber SBR for biological treatment. The biochemically treated water is disinfected in a disinfection tank to obtain recycled water.

[0006] Preferably, when the microfilter performs primary filtration to obtain primary filtered water, the microfilter performs solid-liquid separation on the tailwater and uses a precision stainless steel screen inside the microfilter to mechanically filter the tailwater.

[0007] Preferably, the microfilter is a rotary drum microfilter, and the precision stainless steel screen is a 100-200 mesh screen.

[0008] Preferably, when separating fine suspended particles and colloidal substances in the primary filtered water using the dissolved air flotation tank, the primary filtered water in the dissolved air flotation tank is aerated at a pressure of 0.3-0.6 MPa. After dissolved air flotation, the fine suspended particles and colloidal substances are adhered to the flocs by a large number of microbubbles and float to the water surface, where they are removed by a sludge scraping device.

[0009] Preferably, the initial filtrate after air flotation is evenly delivered to each compartment of each multi-compartment SBR through an inlet water separator, while the inlet water separator can also evenly deliver the concentrated supernatant to each multi-compartment SBR.

[0010] Preferably, during the biological treatment, the initial time is set to 0h. The initial filtrate after air flotation simultaneously enters three compartments (a, b, and c) of the multi-compartment SBR. Compartment a is set to an aerobic state with a hydraulic retention time of 4.5h, compartment b to an anoxic state with a hydraulic retention time of 1.5h, and compartment c to an anaerobic state with a hydraulic retention time of 1.5h. After 1.5h of reaction, the water in compartment c is transferred to compartment d, and the water in compartment b is transferred to compartment c. Compartment c is then switched from an anaerobic to an aerobic state, and compartment d is switched to an anoxic state.

[0011] Preferably, after the reaction has proceeded for 3.0 hours, the water in cell d is transferred to cell e, and cell e is adjusted to an aerobic state.

[0012] Preferably, after the reaction has proceeded for 4.5 hours, the aerobic reaction in compartment a is completed and the water is drained. After the water is drained, a new round of pre-filtered water is introduced into compartment a and compartment b respectively, and compartment a is set to an anaerobic state and compartment b to an anoxic state.

[0013] Preferably, after 6.0 hours of reaction, the aerobic reaction in cell C is completed and the water is drained. At the same time, the water in cell A is transferred to cell B, and the water in cell B is transferred to cell C, maintaining cell B in an anoxic state and cell C in an aerobic state. After 7.5 hours of reaction, the aerobic reaction in cell E is completed and the water is drained, completing the treatment of the first-stage pre-filtered water. At this point, cell B is switched from an anoxic state to an aerobic state. After cell B and cell C have each completed 4.5 hours of aerobic reaction, the water is drained. The multi-compartment SBR preferably consists of eight compartments a, b, c, d, e, f, g, and h connected in series. Its operation employs a periodic, phased control strategy. Specifically, within a complete initial treatment cycle, for example, from 0h to 7.5h, not all eight compartments participate in treatment simultaneously. In the first round of operation, the system sequentially activates five compartments (a, b, c, d, and e) to complete the entire process of influent, reaction, sedimentation, and effluent discharge, while compartments f, g, and h serve as buffer or standby compartments during this phase. After the first round of treatment (7.5 hours), the system directly starts the second round of operation from cells b and c: cell b is switched from anoxic to aerobic state, and continues the remaining 4.5 hours of aerobic reaction with cell c, followed by drainage; simultaneously, the three idle cells f, g, and h are reused as influent cells for the second round, completing influent, water transfer, state switching, and batch drainage according to the exact same timing and operating conditions (aerobic / anoxic / anaerobic) as cells a, b, and c in the first round; the original cells a, d, and e are converted into buffer cells for this round. Through the rotation of 8 cells, complete synchronization of the two rounds, and immediate reuse of cells after they become vacant, the system achieves seamless connection between the first and second rounds. Treated water is sequentially discharged into the disinfection unit, and new effluent continuously enters the vacated cells, thus achieving continuous and efficient treatment of aquaculture effluent.

[0014] Preferably, a system for recycling aquaculture wastewater, applicable to the integrated method for recycling aquaculture wastewater as described in any of the above claims, includes: a microfilter, a flotation tank, a sludge thickening tank, a multi-chamber SBR, an influent separator, and a disinfection tank. The microfilter, flotation tank, influent separator, multi-chamber SBR, and disinfection tank are sequentially connected via conveying pipes. One side of the sludge thickening tank is connected to the multi-chamber SBR via a second conveying pipe, and the other side of the sludge thickening tank is connected to the influent separator via a drain pipe. Each of the microfilter and the sludge thickening tank is connected to the end of a sludge discharge pipe, the other end of which is connected to a sludge discharge pipe. Valves are connected inside the conveying pipe, the second conveying pipe, the drain pipe, and the sludge discharge pipe.

[0015] The beneficial effects of this invention are as follows: In the solution of this invention: 1. By using a multi-compartment SBR to treat water, not only can the purpose of efficient nitrogen and phosphorus removal be achieved, but the effect of nitrogen and phosphorus removal can also be enhanced. Furthermore, by utilizing the series of compartments, water can be transferred and reacted between multiple compartments, forming a multi-stage treatment process. This effectively buffers the impact on water quality and solves the problems of large footprint, low efficiency, and poor adaptability to fluctuations in traditional aquaculture wastewater treatment. 2. The method uses a microfiltration unit, an air flotation tank, and multiple multi-chamber SBRs to treat effluent, fundamentally changing the form of traditional processes. It replaces decentralized civil engineering with complete sets of equipment and replaces manual experience with program control, thereby effectively solving the non-technical pain point of "increased complexity and cost of construction and operation and higher requirements for design and management" at the system level. This aligns with the industry trend of "infrastructure-based, precise, and resource-based" development mentioned in the background of the document. 3. The method follows the effluent treatment logic of physical interception, chemical separation, biodegradation, solid-liquid separation and disinfection to ensure water quality safety, which reduces the difficulty of wastewater treatment and improves the efficiency of wastewater treatment. 4. The effluent discharge is characterized by intermittent discharge, large instantaneous flow, and fluctuating pollutant concentration with the aquaculture cycle. The method uses a multi-chamber SBR treatment process to treat the wastewater, which has the characteristics of flexible wastewater treatment cycle and resistance to shock loads. The design of multiple multi-chamber SBRs further enhances the system's buffering and regulation capabilities. Attached Figure Description

[0016] Figure 1 This is a process flow diagram of the present invention; Figure 2 This is a flowchart of the processing system of the present invention; Figure 3 This is a schematic diagram showing the connection relationship between the multi-compartment SBR and the inlet water separator of the present invention; Figure 4 This is a cross-sectional view of the outer casing of the present invention; Figure 5 This is a schematic diagram of the connection relationship between the pipes and the second pipe in this invention; Figure 6 This is a cross-sectional view of the rotating tube of the present invention; Figure 7 This is a schematic diagram of the torsion spring mounting position according to the present invention; Figure 8 This is a schematic diagram illustrating the interlacing and conductive relationship between the water spray pipe and the waist-shaped hole of the present invention; Figure 9 This is a schematic diagram of the spring mounting position according to the present invention; Figure 10 This is a schematic diagram showing the connection relationship between the rotating shaft and the motor of the present invention; Figure 11 This is a schematic diagram of the cleaning mechanism structure of the present invention; Figure 12 This is a schematic diagram of the filter installation position according to the present invention; Figure 13 This is a schematic diagram showing the connection relationship between the guide post, connecting rod, and longitudinal rod of the present invention; Figure 14 This is a cross-sectional view of the drive tube of the present invention.

[0017] The components include: microfilter 1, flotation tank 2, sludge thickening tank 3, outer shell 31, sludge conveying hole 32, drain pipe 33, sludge discharge pipe 34, sludge discharge pump 35, motor 36, cleaning mechanism 37, rotating pipe 371, water supply assembly 372, sleeve 3721, annular trough 3722, jacket 2 3723, opening 3724, water inlet pipe 3725, sludge discharge hole 373, jacket 374, pipe 375, torsion spring 3751, spray pipe 3752, oblong hole 3753, guide. 3754, shell 3755, spring 3756, pipe 2 376, scraper 377, multi-compartment SBR 4, inlet separator 5, rotating shaft 6, motor 2 61, cleaning mechanism 7, rotating shaft 2 71, steering wheel 72, drive rod 73, ball valve 74, through hole 75, filter screen 76, torsion spring 2 77, guide column 78, connecting rod 79, longitudinal rod 80, drive pipe 81, piston 82, baffle pipe 83, through hole 2 84, backwash pipe 85, discharge pipe 86, disinfection tank 9, sludge discharge pipe 10. Detailed Implementation

[0018] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0019] Example 1: Reference Figures 1-14 An integrated method for the recycling and treatment of aquaculture wastewater includes the following steps: After collecting the effluent, microfiltration machine 1 is used for primary filtration to obtain pre-filtered water; The air flotation tank 2 is used to separate fine suspended particles and colloidal substances in the primary filtered water; Multiple multi-chamber SBR4 structures were constructed to biologically treat the initial filtrate after air flotation to obtain biochemically treated water. While obtaining biochemically treated water, the sludge in the multi-chamber SBR4 is transported to the sludge thickening tank 3, and the concentrated supernatant is reintroduced into the multi-chamber SBR4 for biological treatment. The biochemically treated water is disinfected in disinfection tank 9 to obtain recycled water.

[0020] The principles and beneficial effects of the above scheme are as follows: After the effluent is collected, the microfilter 1 performs efficient solid-liquid separation, removing large particles of suspended solids such as uneaten feed, feces, and biological remains. This primarily reduces the suspended load on subsequent biological treatment units, preventing equipment blockage and providing lower load and more stable water quality for subsequent biological treatment units. After this initial filtration, the effluent is pre-filtered. Then, the dissolved air flotation tank 2 separates the remaining fine suspended particles and colloidal substances. The dissolved air flotation tank 2 is equipped with a scraper, specifically a chain-type sludge and oil scraper (model NK-LGN) manufactured by Shandong Nuokun Environmental Protection Technology Co., Ltd., which scrapes and cleans impurities that have adhered to flocs and floated to the surface after aeration by a large number of microbubbles. This process removes organic pollutants such as proteins and oils from the pre-filtered effluent. The process of cleaning effectively reduces the organic load in the water. Subsequently, multiple multi-chamber SBR4s are constructed to biologically treat the initial filtrate after air flotation, resulting in biochemically treated water. Simultaneously, the sludge from the multi-chamber SBR4s is transported to a sludge thickening tank 3. In the sludge thickening tank 3, the concentrated supernatant is reintroduced into the multi-chamber SBR4s for secondary biological treatment, thereby effectively removing organic pollutants from the water. The dissolved organic matter (COD and BOD) produced by the decomposition of residual feed and feces is decomposed into harmless substances such as carbon dioxide and water. During the biochemical treatment, nitrification and denitrification can be used to deeply denitrify the water and simultaneously remove phosphorus. Finally, the biochemically treated water is disinfected in a disinfection tank 9 to obtain recycled water, which is then circulated back to the aquaculture ponds for reuse. By using a multi-compartment SBR4 to treat water, not only can efficient nitrogen and phosphorus removal be achieved, but the effect of nitrogen and phosphorus removal can also be enhanced. Furthermore, by utilizing the series of compartments, water can be transferred and reacted between multiple compartments, forming a multi-stage treatment process. This effectively buffers the impact on water quality and solves the problems of large footprint, low efficiency, and poor adaptability to fluctuations in traditional aquaculture wastewater treatment.

[0021] The method treats effluent by using a microfilter 1, an air flotation tank 2, and multiple multi-chamber SBR4s, fundamentally changing the form of traditional processes. It replaces decentralized civil engineering with complete sets of equipment and replaces manual experience with program control, thereby effectively solving the non-technical pain point of "increased complexity and cost of construction and operation and higher requirements for design and management" at the system level. This aligns with the industry trend of "infrastructure-based, precise, and resource-based" development mentioned in the background of the document.

[0022] The method follows the tailwater treatment logic of physical interception, chemical separation, biodegradation, solid-liquid separation and disinfection to ensure water quality safety, which reduces the difficulty of wastewater treatment and improves the efficiency of wastewater treatment. The wastewater discharge is characterized by intermittent discharge, large instantaneous flow, and fluctuating pollutant concentration with the aquaculture cycle. The method uses a multi-chamber SBR4 treatment process to treat the wastewater, which has the characteristics of flexible wastewater treatment cycle and resistance to shock loads. The design of multiple multi-chamber SBR4 further enhances the system's buffering and regulation capabilities.

[0023] Example 2: Reference Figures 1-14 When the microfilter 1 performs initial filtration to obtain pre-filtered water, the microfilter 1 performs solid-liquid separation on the tailwater and uses a precision stainless steel screen inside the microfilter 1 to perform mechanical filtration on the tailwater.

[0024] The microfilter 1 is specifically a rotary drum microfilter, and the precision stainless steel screen is specifically a 100-200 mesh screen.

[0025] The principles and beneficial effects of the above scheme are as follows: Microfilter 1 is specifically a rotary drum microfilter. When mechanically filtering the effluent, the stainless steel screen used has a mesh size of 100-200 mesh, which effectively intercepts most of the solid suspended matter such as uneaten food, feces, and molted shells in the water, achieving preliminary solid-liquid separation. The concentration of suspended matter in the effluent after filtration by the microfilter has been greatly reduced.

[0026] Example 3: Reference Figures 1-14 When the air flotation tank 2 is used to separate fine suspended particles and colloidal substances in the primary filtered water, air is introduced into the primary filtered water in the air flotation tank 2. The gas introduced is air or ozone, and the gas pressure during aeration is 0.3-0.6 MPa. After dissolved air flotation, the fine suspended particles and colloidal substances are adhered to the flocs by a large number of microbubbles and float to the water surface, where they are removed by the sludge scraping equipment.

[0027] The principles and beneficial effects of the above scheme are as follows: When air is used for aeration, a large number of microbubbles are generated, which physically adsorb colloids, tiny suspended particles, oils, and some hydrophobic soluble substances, such as certain proteins, in the wastewater, forming "bubble-particle" flocs that float to the water surface and are removed by a sludge scraper. The oxygen in the air can also be used to have a slight oxidizing effect, but the direct decomposition effect on organic matter is very limited. The reason for choosing air for aeration is that it is implemented when the organic matter content in the water is low, and it has the characteristics of low cost, mature technology, and wide application. When ozone is used for aeration, because ozone is a strong oxidant, it generates microbubbles to achieve physical separation. At the same time, the ozone dissolved in the water can directly oxidize and decompose the recalcitrant organic matter, chromophores, and odor-causing substances in the water, and effectively kill bacteria and viruses. It can also change the surface properties of some pollutants, making them more hydrophobic, thereby improving the adsorption efficiency with bubbles and increasing the removal rate of flotation. At the same time, the huge gas-liquid contact interface generated by flotation also promotes the reaction of ozone. The reason for using ozone for aeration in this case is that it is implemented when the organic matter content in the water body is relatively high. Its treatment effect is more thorough, especially suitable for wastewater containing recalcitrant organic matter, high color, or requiring pre-disinfection.

[0028] Example 4: Reference Figures 1-14 The initial filtered water after air flotation is evenly transported to each compartment of each multi-compartment SBR4 through the inlet water separator 5. At the same time, the inlet water separator 5 can evenly transport the concentrated supernatant to each multi-compartment SBR4.

[0029] The principles and beneficial effects of the above scheme are as follows: Before the water enters the multi-compartment SBR reactor, the wastewater is distributed and initially mixed uniformly to ensure that each subsequent treatment compartment receives a relatively stable and balanced influent load, thereby ensuring the stability and efficiency of the entire biological treatment system.

[0030] Example 5: Reference Figures 1-14 During the biological treatment, the initial time is set to 0h. The initial filtrate after air flotation simultaneously enters three compartments (a, b, and c) of the multi-compartment SBR4. Compartment a is set to an aerobic state with a hydraulic retention time of 4.5h, compartment b to an anoxic state with a hydraulic retention time of 1.5h, and compartment c to an anaerobic state with a hydraulic retention time of 1.5h. After 1.5h of reaction, the water in compartment c is transferred to compartment d, and the water in compartment b is transferred to compartment c. The state of compartment c is then switched from anaerobic to aerobic, and the state of compartment d is switched to anoxic.

[0031] After 3.0 hours of reaction, the water in cell d was transferred to cell e, and cell e was adjusted to an aerobic state.

[0032] After 4.5 hours of reaction, the aerobic reaction in compartment a was completed and the water was drained. After the water was drained, a new round of primary filtered water was introduced into compartment a and compartment b respectively, and compartment a was set to an anaerobic state and compartment b to an anoxic state.

[0033] After 6.0 hours of reaction, the aerobic reaction in cell C is completed and the water is drained. At the same time, the water in cell A is transferred to cell B, and the water in cell B is transferred to cell C. Cell B is kept in an anoxic state, while cell C is kept in an aerobic state. After 7.5 hours of reaction, the aerobic reaction in cell E is completed and the water is drained, thus completing the treatment of the first stage of primary filtrate. At this point, cell B is switched from an anoxic state to an aerobic state. After cell B and cell C have each completed 4.5 hours of aerobic reaction, the water is drained. The liquid flow between the compartments is driven by gravity difference or by power provided by a pump. The multi-compartment SBR4 preferably consists of eight compartments (a, b, c, d, e, f, g, and h) connected in series. Its operation employs a periodic, phased control strategy. Specifically, in a complete initial treatment cycle, for example, from 0h to 7.5h, not all eight compartments participate in treatment simultaneously. In the first round of operation, the system sequentially activates five compartments (a, b, c, d, and e) to complete the entire process of water intake, reaction, sedimentation, and drainage, while compartment f... During this stage, compartments b, g, and h serve as buffer or standby compartments. After the first round of treatment (7.5 hours), the system directly starts the second round of operation from compartments b and c: compartment b is switched from anoxic to aerobic state, and continues the remaining 4.5 hours of aerobic reaction with compartment c, followed by drainage. Simultaneously, the three idle compartments f, g, and h are reused as influent compartments for the second round, completing influent, water transfer, state switching, and batch drainage according to the exact same timing and operating conditions (aerobic / anoxic / anaerobic) as compartments a, b, and c in the first round. The original compartments a, d, and e become buffer and standby compartments for this round. By grouping and rotating the eight compartments, synchronizing the timing of the two rounds, and immediately reusing the compartments after they become vacant, the system achieves seamless connection between the first and second rounds. The treated water is sequentially discharged into the disinfection unit, and new effluent continuously enters the vacated compartments, thus achieving continuous and efficient treatment of aquaculture effluent.

[0034] The principles and beneficial effects of the above scheme are as follows: The above process consists of two reaction flows, using a total of five compartments. Five compartments are left empty at 0h and 7.5h, designated as d, e, f, g, and h. After 7.5h, compartments d, e, f, g, and h can repeat the above process, running according to a, b, c, d, and e respectively to complete the treatment again. After another 7.5h of treatment, the effluent treatment process is consistent with that from 0-7.5h. After f and g complete 4.5h of aerobic reaction, effluent is discharged.

[0035] Example 6: Reference Figures 1-14A system for recycling aquaculture wastewater, applicable to the integrated method for recycling aquaculture wastewater as described above, includes: a microfilter 1, a flotation tank 2, a sludge thickening tank 3, a multi-chamber SBR 4, an influent separator 5, and a disinfection tank 9. The microfilter 1, flotation tank 2, influent separator 5, multi-chamber SBR 4, and disinfection tank 9 are sequentially connected via conveying pipes. One side of the sludge thickening tank 3 is connected to the multi-chamber SBR 4 via a second conveying pipe, and the other side of the sludge thickening tank 3 is connected to the influent separator 5 via a drain pipe 33. Each of the microfilter 1 and the sludge thickening tank 3 is connected to the end of a sludge discharge pipe 34, the other end of which is connected to a sludge discharge pipe 10. Valves are connected to the conveying pipes, the second conveying pipe, the drain pipe 33, and the sludge discharge pipe 34. The pipeline structure connects different units to achieve the transfer of water and sludge. The system's response speed during wastewater treatment is improved by using a PLC to control the valves, and the management difficulty of the system is reduced. The effluent first enters the microfilter 1 for preliminary mechanical filtration, then enters the dissolved air flotation tank 2 for aeration, and is then mixed by the influent separator 5 before being distributed to the multi-chamber SBR4 for biological treatment. The chambers within the multi-chamber SBR4 are connected in series using a closed-loop system. Specifically, adjacent chambers, such as a and b, b and c, are directly connected by connecting pipes to achieve short-distance water flow transfer. To form a complete treatment loop, chambers d and e, and h and a, are connected by long pipes. This design ensures that the water... The flow can start from cell a, pass through cells b, c, and d in sequence, then enter cell e through a long pipe, then pass through cells f and g, and finally return from cell h to cell a through another long pipe, forming a continuous and controllable closed loop channel. After being distributed by the inlet separator 5, the water is transported to specific positions in this loop channel, such as the initial cells a, b, and c, according to a preset time control program. In subsequent steps, the water is sequentially advanced, processed, and transferred. The biochemically treated water obtained after treatment is discharged through cell a, cell c, or cell e for disinfection. The remaining sludge is recycled and treated by the sludge thickening tank 3. The system physically realizes the series connection of multiple independent reaction zones within a compact reactor, providing a basis for creating different environments such as anaerobic, anoxic, and aerobic and arranging them in sequence in space, thereby efficiently completing multi-stage biological reactions such as nitrification and denitrification, and significantly improving nitrogen and phosphorus removal efficiency; This series-closed pipe connection, combined with precise timing control, enables the system to operate in a combination of "push flow" and "sequential batch" mode. This gives the system strong resistance to shock loads and operational flexibility, effectively buffering water quality and quantity fluctuations caused by intermittent discharge of aquaculture wastewater, and ensuring stable effluent. This connection method supports the complete automation of the entire processing flow. Water flow transfer and operating condition switching are all controlled by the program, which greatly reduces the complexity of operation and maintenance of traditional processes and the dependence on manpower, and realizes the leap from extensive management to precise and intelligent operation. In summary, while reducing the heavy burden of construction and operation and maintenance costs on small-scale farmers, the system ensures technical adaptability, stable effluent treatment efficiency, strong resistance to shock loads, and small footprint, thereby reducing the difficulty of design and management as well as unified supervision.

[0036] Example 7: Reference Figures 1-14 The sludge thickening tank 3 includes: an outer shell 31, a sludge conveying hole 32, a drain pipe 33, a sludge discharge pipe 34, a sludge discharge pump 35, a motor 36, and a cleaning mechanism 37. The bottom conical wall of the outer shell 31 has a sludge conveying hole 32, which is connected to multiple multi-compartment SBR4s through a conveying pipe to recover sludge from the multi-compartment SBR4s. A solenoid valve is installed on the pipe. The inner wall of the outer shell 31 is connected to the drain pipe 33 for discharging the supernatant. The bottom wall of the outer shell 31 is connected to the sludge discharge pipe 34, and the sludge discharge pump 35 is connected in the sludge discharge pipe 34. The sludge discharge pump 35 is connected to the output end of the motor 36. The cleaning mechanism 37 is connected inside the outer shell 31 and is in frictional engagement with the conical bottom wall of the outer shell 31.

[0037] The principles and beneficial effects of the above scheme are as follows: The sludge thickening tank 3 is used to receive sludge from the multi-chamber SBR4 to reduce the water content of the sludge. When the device is working, the multi-chamber SBR4 discharges the biochemically treated water while the sludge is transported to the sludge conveying hole 32 through the second conveying pipe. Then the sludge enters the interior of the shell 31, and the solenoid valve is closed. During the process of transporting sludge in the second conveying pipe, a screw pump or other existing pump structure can be used to provide power for the transport of sludge. The sludge in the shell 31 uses the principle of gravity settling. By reducing the sludge flow rate, the sludge particles settle naturally, and the supernatant is separated from the upper layer. When the supernatant is recovered, part of the supernatant is transported back to the inlet separator 5 through the drain pipe 33. The settled sludge is further squeezed and concentrated at the bottom of the shell 31, thereby increasing the sludge solids content and reducing the volume of subsequent treatment. After the sludge settling is completed, the second solenoid valve in the sludge discharge pipe 34 is opened, and the motor 36 is started to drive the sludge discharge pump 35 to work, and the concentrated sludge is discharged into the sludge discharge pipe 10. As can be seen from the above embodiments, the sludge thickening tank 3 in the system will work intermittently when treating the effluent. After all the thickened sludge is discharged, there will still be residual sludge. If the residual sludge is not treated in time, the solid content of the sludge will decrease when the device thickens sludge in the next time. Therefore, after the device finishes conveying sludge, the cleaning mechanism 37 in the device is activated to scrape and clean the conical bottom wall of the outer shell 31 to prevent sludge residue, thereby avoiding residual sludge from occupying the internal space of the outer shell 31, avoiding insufficient settling of particles in the sludge, ensuring stable solid content of the sludge, and avoiding the increase of suspended solids in the supernatant. In addition, cleaning up the sludge can prevent the anaerobic fermentation of sludge inside the outer shell 31, thereby preventing the generation of gases such as hydrogen sulfide and methane, which could lead to equipment corrosion and operator poisoning. Furthermore, it can also prevent sludge from hardening inside the device or forming more viscous residual sludge, and prevent the above substances from clogging the sludge discharge pipe 34 and the sludge discharge pump 35.

[0038] Example 8: Reference Figures 1-14 The cleaning mechanism 37 includes: a rotating pipe 371, a water supply component 372, a sleeve 3721, an annular groove 3722, a second jacket 3723, an opening 3724, a water inlet pipe 3725, a mud discharge hole 373, a jacket 374, a pipe 375, a second pipe 376, and a scraper 377. The rotating pipe 371 is rotatably and sealingly connected to the bottom wall of the outer casing 31. The bottom of the rotating pipe 371 is connected to the water supply component 372. The sleeve 3721 of the water supply component 372 is connected to the bottom of the outer casing 31. An annular groove 3722 is opened on the bottom side wall of the rotating pipe 371 outside the outer casing 31. The annular groove 3722 slides tightly with the inner wall of the sleeve 3721. The casing 3721 is fitted with a second jacket 3723, which is connected to an opening 3724 on the inner wall of the casing 3721. A water inlet pipe 3725 is connected to the side wall of the casing 3721. A mud discharge hole 373 is opened through the side wall of the rotating pipe 371, which is connected to the inside of the outer shell 31 and the mud discharge pipe 34. A jacket 374 is fitted inside the rotating pipe 371, which is connected to the opening 3724. The inner wall of the jacket 374 is connected to the end of the pipe 375. A second pipe 376 is rotatably connected to the outside of the pipe 375. A scraper 377 is connected to the second pipe 376, and the scraper 377 is in friction fit with the conical bottom wall of the outer shell 31.

[0039] The other end of the pipe 375 is connected to the end of the torsion spring 3751. The pipe 375 and the second pipe 376 are rotatably sealed together. The other end of the torsion spring 3751 is connected to the inner wall of the second pipe 376. The inner wall of the second pipe 376 is connected to the ends of multiple water spray pipes 3752. A one-way valve is connected inside the water spray pipe 3752. The other end of the water spray pipe 3752 is set towards the conical bottom wall of the outer casing 31. Multiple waist-shaped holes 3753 are longitudinally opened through the inner wall of the pipe 375. The waist-shaped holes 3753 are arranged one-to-one with the water spray pipes 3752. The top of 753 is staggered with the end of the water spray pipe 3752. The top of the guide shell 3754 is connected to the side wall of the pipe 376 away from the water spray pipe 3752. The top of the scraper 377 is slidably and sealed inside the guide shell 3754. The top surface of the scraper 377 is connected to the top wall of the guide shell 3754 through the spring 3755. The rotating pipe 371 is connected to the rotating shaft 6. The rotating shaft 6 is rotatably and sealed to the top of the outer shell 31. The end of the rotating shaft 6 located above the top surface of the outer shell 31 is connected to the output end of the motor 61. The motor 61 is connected to the outer shell 31.

[0040] The principles and beneficial effects of the above scheme are as follows: When cleaning residual sludge, motor 2 61 starts, and the output end of motor 2 61 drives the rotating shaft 6 to rotate, and the rotating pipe 371 rotates synchronously. The rotating pipe 371 rotates and seals with the bottom of the outer casing 31. When the rotating pipe 371 is stationary and the concentrated sludge is being discharged, the concentrated sludge is discharged through the sludge discharge hole 373. While the rotating pipe 371 is rotating, pipe 375 and pipe 2 376 rotate synchronously, and the scraper 377 is subjected to the residual sludge. The obstruction causes the torsion spring 3751 to twist. To ensure that the bottom of the scraper 377 can always contact the conical bottom wall of the outer casing 31, the spring 3755 in the guide shell 3754 connected to the side wall of the second pipe 376 provides elastic force. When the viscosity of the sludge is low, the rotation angle of the second pipe 376 relative to the pipe 375 is small, and the torsion degree of the torsion spring 3751 is low; when the viscosity of the sludge is high, the rotation angle of the second pipe 376 relative to the pipe 375 is large, and the torsion degree of the torsion spring 3751 is high. While the scraper 377 cleans the conical bottom wall of the outer casing 31, the water inlet pipe 3725 supplies water to the jacket 3723 of the sleeve 3721. The water then enters the interior of the jacket 374 through the opening 3724 facing the jacket 374. The water flows through the pipe 375 into the oblong hole 3753, and after passing through the oblong hole 3753 into the one-way valve in the spray pipe 3752, it is sprayed onto the conical bottom wall of the outer casing 31. Since the scraper 377 and the spray pipe 3752 are respectively located on both sides of the second pipe 376, before the scraper 377 scrapes the residual sludge, the water flows through the second pipe 376... The water jet 76 cleans the conical bottom wall of the outer casing 31. While cleaning, it can increase the fluidity of residual sludge and reduce the resistance and cleaning difficulty of the scraper 377 when scraping the residual sludge. Since the internal structure of the outer casing 31 is that the top of the conical bottom wall is connected to the vertical tubular inner wall, after the concentrated sludge is discharged, the sludge on the vertical tubular inner wall can flow to the conical bottom wall under the action of gravity for uniform cleaning. The device can also be equipped with an auxiliary water spray pipe connected to the inner wall of the jacket 374, and a one-way valve two connected in the auxiliary water spray pipe to rinse the vertical tubular inner wall of the outer casing 31. A one-way valve is installed in the water spray pipe 3752 to prevent sludge from entering the water spray pipe 3752 when the device is thickening sludge. Synchronously based on the instruction manual Figure 8 As shown in the figure, “a” indicates the rotation direction of pipe 2 376 during operation. It can be seen that because the top of the waist-shaped hole 3753 and the end of the spray pipe 3752 are alternately connected, when the viscosity of the sludge is low, the rotation angle of pipe 2 376 is small. Since pipe 375 is fixed in the circumferential direction, when the waist-shaped hole 3753 is used as a reference, the area of ​​the alternate connection between the end of the spray pipe 3752 and the top of the waist-shaped hole 3753 is small, and the volume of water output by the spray pipe 3752 is small. When the sludge viscosity is high, the rotation angle of pipe 376 is large. With the waist-shaped hole 3753 as a reference, the area of ​​the intersection between the end of the water spray pipe 3752 and the top of the waist-shaped hole 3753 increases, and the volume of water output by the water spray pipe 3752 increases. By controlling the water discharge of the cleaning device through the connection area between the waist-shaped hole 3753 and the water spray pipe 3752, water waste can be reduced. It can also prevent the discharged clean water from directly impacting the conical bottom wall when the content of residual sludge in the mechanism is low.

[0041] Example 9: Reference Figures 1-14A cleaning mechanism 7 is connected to the drain pipe 33. The cleaning mechanism 7 includes a second rotating shaft 71, a steering wheel 72, and a drive rod 73. The second rotating shaft 71 is rotatably connected to the drain pipe 33. A ball valve 74 is rotatably and sealingly connected inside the drain pipe 33. The through hole 75 of the ball valve 74 is connected to the drain pipe 33. The filter screen 76 connected to the through hole 75 faces the outer casing 31. The ball valve 74 is connected to the end of the second rotating shaft 71. The end of the second rotating shaft 71 outside the drain pipe 33 is connected to the steering wheel 72. The end of the second torsion spring 77 is connected to the side wall of the steering wheel 72. The other end of the second torsion spring 77 is connected to the side wall of the drain pipe 33. The end of the guide post 78 is connected to the steering wheel 72. The ball valve 74 is located between the outer casing 31 and the drive pipe 81. The guide post 78 is hinged to the top of the connecting rod 79. The bottom of the connecting rod 79 away from the outer casing 31 is hinged to the top of the longitudinal rod 80. The longitudinal rod 80 is slidably sealed to the top of the drive pipe 81. The drive pipe 81 is connected to the side wall of the drain pipe 33. The bottom of the drive pipe 81 is connected to the output end of the water pump. A piston 82 is slidably sealed inside the drive pipe 81. The top surface of the piston 82 is connected to the bottom end of the baffle pipe 83. The top end of the baffle pipe 83 is connected to the top of the longitudinal rod 80. The piston 82 and the baffle pipe 83 form a longitudinally sliding buoyancy block. The side wall of the buoyancy block is sealed to the through hole 84 on the inner wall of the drive pipe 81. The through hole 84 is connected to the end of the backwash pipe 85. The top of the backwash pipe 85 is connected to the top wall of the drain pipe 33. The top of the backwash pipe 85 is set towards the ball valve 74. The vertical part of the top of the backwash pipe 85 is set perpendicular to the through hole 75. The bottom wall of the drain pipe 33 is connected to the top of the discharge pipe 86. The discharge pipe 86 is coaxially set with the vertical part of the backwash pipe 85. The bottom of the discharge pipe 86 is set away from the side wall of the drain pipe 33.

[0042] The principles and beneficial effects of the above scheme are as follows: The drain pipe 33 is used to discharge the supernatant. To reduce suspended solids in the discharged supernatant, a ball valve 74 is rotatably and sealingly connected in the drain pipe 33. A through hole 75 is provided through the ball valve 74. A filter screen 76 connected to the inner wall of the outer casing 31 in the through hole 75 intercepts suspended solids. After the filter screen 76 has been working for a period of time, it will become clogged, resulting in a decrease in working efficiency. Therefore, a mechanism is set up to assist in cleaning it. After the cleaning begins, the water flows through the pump and enters the bottom of the drive pipe 81. After water enters the bottom of the piston 82, the buoyancy block formed by the baffle pipe 83 and the piston 82 rises in height within the vertically placed drive pipe 81. The longitudinal rod 80 moves upward synchronously. The bottom of the connecting rod 79, which is hinged at the top of the longitudinal rod 80, rotates, and the connecting rod 79 moves upward synchronously. With the rotational engagement, the top of the connecting rod 79 drives the guide column 78 to rotate counterclockwise, the steering wheel 72 and the second rotating shaft 71 to rotate counterclockwise, the ball valve 74 to rotate counterclockwise, and the second torsion spring 77 to twist. The filter screen 76 rotates downward and is positioned towards the top of the discharge pipe 86. At this time, the discharge pipe 86, the backwash pipe 85 and the through hole 75 are connected. At the same time, as the height of the buoyancy block rises, it ends the seal on the second through hole 84. After some water enters the backwash pipe 85, it enters the vertical through hole 75 from the top of the drain pipe 33. The cleaning water backwashes the filter screen 76 from the opposite direction. The backwash water is discharged through the discharge pipe 86. During the cleaning process, the through hole 75 and the drain pipe 33 are not connected, so the backwash water will not enter the interior of the outer casing 31 to avoid secondary pollution. After the cleaning is completed, the water supply to the bottom of the drive pipe 81 is stopped. As the buoyancy and water pressure decrease, the torsion spring 77 twists in the opposite direction. The side wall of the buoyancy block re-seals the through hole 84. The height of the guide column 78, connecting rod 79 and longitudinal rod 80 decreases. The steering wheel 72 rotates clockwise. The bottom of the connecting rod 79 reverses and its height decreases. After the device is reset, the through hole 75 of the ball valve 74 is reset and reconnected to the drain pipe 33. The filter screen 76 is reset in preparation for the next filtration of the surface clean liquid. When there is residual water in the backwash tube 85 of the mechanism, the operator can directly use a tool to apply an upward thrust to the bottom of the piston 82 from the bottom of the drive tube 81, and drain the water from the inside of the backwash tube 85 after the connection between the buoyancy block and the through hole 84 is terminated, or an electroplating layer can be set on the inner wall of the backwash tube 85 to prevent corrosion from residual cleaning water. During backwashing, the filter screen 76 temporarily closes the drain pipe 33 via the ball valve 74. Alternatively, the drain pipe 33 can be closed or opened by connecting a solenoid valve to the drain pipe 33, thus avoiding affecting the settling effect of the sludge.

[0043] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. Other modifications can be easily made by those skilled in the art. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. An integrated method for the recycling and treatment of aquaculture wastewater, characterized in that, Includes the following steps: After collecting the wastewater, a microfilter (1) is used for primary filtration to obtain the primary filtered water; The fine suspended particles and colloidal substances in the primary filtered water are separated by an air flotation tank (2); Multiple multi-chamber SBRs (4) were constructed, and the primary filtrate after air flotation was biologically treated to obtain biochemically treated water. While obtaining biochemically treated water, the sludge in the multi-chamber SBR (4) is transported to the sludge thickening tank (3), and the concentrated supernatant is reintroduced into the multi-chamber SBR (4) for biological treatment. The biochemically treated water is disinfected in a disinfection tank (9) to obtain recycled water.

2. The integrated method for treating aquaculture wastewater recycling according to claim 1, characterized in that, When the microfilter (1) performs initial filtration to obtain initial filtered water, the microfilter (1) performs solid-liquid separation on the tailwater and uses the precision stainless steel screen inside the microfilter (1) to perform mechanical filtration on the tailwater.

3. The integrated method for treating aquaculture wastewater recycling according to claim 2, characterized in that, The microfilter (1) is specifically a rotary drum microfilter, and the precision stainless steel screen is specifically a 100-200 mesh screen.

4. The integrated method for treating aquaculture wastewater recycling according to claim 1, characterized in that, When using the dissolved air flotation tank (2) to separate fine suspended particles and colloidal substances in the primary filtered water, the primary filtered water in the dissolved air flotation tank (2) is aerated with air at a pressure of 0.3-0.6 MPa. After dissolved air flotation, the fine suspended particles and colloidal substances are attached to the flocs by a large number of microbubbles and float to the water surface, where they are removed by a sludge scraping device.

5. The integrated method for treating aquaculture wastewater recycling according to claim 1, characterized in that, The initial filtered water after air flotation is evenly transported to each compartment of each multi-chamber SBR (4) through the inlet water separator (5), while the inlet water separator (5) can evenly transport the concentrated supernatant to each multi-chamber SBR (4).

6. The integrated method for treating aquaculture wastewater recycling according to claim 1, characterized in that, During the biological treatment, the initial time is set to 0h. The initial filtrate after air flotation enters the three compartments a, b, and c of the multi-compartment SBR (4) simultaneously. The compartment a is set to aerobic state with a hydraulic retention time of 4.5h, the compartment b is set to anoxic state with a hydraulic retention time of 1.5h, and the compartment c is set to anaerobic state with a hydraulic retention time of 1.5h. After 1.5h of reaction, the water in the compartment c is transferred to the compartment d, the water in the compartment b is transferred to the compartment c, and the compartment c is adjusted from anoxic to aerobic state, while the compartment d is adjusted to anoxic state.

7. The integrated method for treating aquaculture wastewater recycling according to claim 6, characterized in that, After 3.0 hours of reaction, the water in cell d was transferred to cell e, and cell e was adjusted to an aerobic state.

8. The integrated method for treating aquaculture wastewater recycling according to claim 7, characterized in that, After 4.5 hours of reaction, the aerobic reaction in compartment a was completed and the water was drained. After the water was drained, a new round of primary filtered water was introduced into compartment a and compartment b respectively, and compartment a was set to an anaerobic state and compartment b to an anoxic state.

9. The integrated method for treating aquaculture wastewater recycling according to claim 8, characterized in that, After 6.0 hours of reaction, the aerobic reaction in cell C is completed and the water is drained. At the same time, the water in cell A is transferred to cell B, and the water in cell B is transferred to cell C. Cell B is kept in an anoxic state, while cell C is kept in an aerobic state. After 7.5 hours of reaction, the aerobic reaction in cell E is completed and the water is drained, thus completing the treatment of the first stage of primary filtrate. At this point, cell B is switched from an anoxic state to an aerobic state. After cell B and cell C have each completed 4.5 hours of aerobic reaction, the water is drained.

10. A system for recycling aquaculture wastewater, applicable to the integrated method for recycling aquaculture wastewater as described in any one of claims 1-6, characterized in that, include: The microfilter (1), flotation tank (2), sludge thickening tank (3), multi-chamber SBR (4), influent separator (5) and disinfection tank (9) are connected in sequence through conveying pipes. One side of the sludge thickening tank (3) is connected to the multi-chamber SBR (4) through conveying pipe two. The other side of the sludge thickening tank (3) is connected to the influent separator (5) through drain pipe (33). The microfilter (1) and the sludge thickening tank (3) are each connected to the end of a sludge discharge pipe (34). The other end of the sludge discharge pipe (34) is connected to the sludge discharge pipe (10). Valves are connected inside the conveying pipe, conveying pipe two, drain pipe (33) and sludge discharge pipe (34).

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