Wastewater treatment system

Abstract

The wastewater treatment system comprises a water inlet unit, a reactor, a separation unit and a circulation unit which are sequentially connected to form a closed-loop system, the water inlet unit is further connected with a chemical dosing unit, the water inlet unit is used for conveying wastewater to the reactor, and the chemical dosing unit is used for adding alkali into the wastewater to adjust the pH value and providing required magnesium ions; a fluidization reaction zone and a separation zone are arranged in the reactor, and the fluidization reaction zone promotes generation and growth of struvite particles through particle collision and aggregation; the separation zone enables generated particles to partially fall back to the fluidization reaction zone for continuous reaction through preliminary solid-liquid separation; the separation unit is used for receiving the wastewater in the separation area, further removing residual particles, and enabling the small particles to flow back to the reactor through the circulation unit for recycling. By optimizing the particle generation, separation and backflow processes in wastewater treatment, the formation of target large particles is promoted, the resource recycling is facilitated, meanwhile, the consumption of chemical agents is reduced, and the cost is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of wastewater treatment technology and relates to a wastewater treatment system. Background Technology

[0002] In fermentation wastewater treatment systems primarily producing soybean protein wastewater, the nitrogen and phosphorus content is high. Currently, chemical precipitation methods are commonly used, especially by adding alkalis and magnesium salts to adjust the pH and provide necessary metal ions (such as Mg). 2+ This process promotes the reaction of nitrogen and phosphorus pollutants with other components to form struvite particles, thereby removing pollutants from wastewater through solid-liquid separation.

[0003] However, existing chemical precipitation wastewater treatment technologies have certain limitations in particle generation and size control. Due to limitations in reaction conditions and mixing efficiency, the generated particles are often of uneven size, resulting in low separation efficiency. Furthermore, the small particle size hinders resource recovery and reuse, and there is also a risk of particle loss. In addition, excessive use of chemical reagents increases costs and may impose an environmental burden, while insufficient precision in automated control also affects the overall efficiency of the system.

[0004] To address these issues, a more efficient and precise wastewater treatment system is needed, capable of precise particle control, reduced chemical reagent consumption, and increased automation. The system must optimize particle recirculation and separation processes to minimize particle loss, and employ a more intelligent control system to reduce operational complexity and energy consumption, thereby improving treatment efficiency and economics. Utility Model Content

[0005] To address the problems of low reaction efficiency, severe particle loss, high chemical reagent consumption, and imprecise automated control in existing technologies, this invention provides a wastewater treatment system. By optimizing the particle generation, separation, and reflux processes in wastewater treatment, it promotes the formation of large target particles, facilitating resource recovery and reuse. Simultaneously, it reduces chemical reagent consumption, lowering costs. Furthermore, automated control improves operational precision and stability, ensuring treatment efficiency and continuous stable system operation. It is particularly suitable for treating wastewater with high pollution loads, especially nitrogen and phosphorus-containing wastewater.

[0006] In order to achieve the above purpose, the technical solution adopted by the present utility model is as follows:

[0007] A wastewater treatment system includes an influent unit, a reactor, a separation unit, and a circulation unit connected in sequence. The influent unit is also connected to a dosing unit.

[0008] The water inlet unit is equipped with a water inlet pipe, which is connected to the reactor and used to transport wastewater into the reactor.

[0009] The dosing unit includes a device for adding at least one agent to wastewater to adjust reaction conditions and promote particle formation.

[0010] The reactor is equipped with a fluidized reaction zone and a separation zone. The fluidized reaction zone is used to promote the generation and growth of particles through particle collision and aggregation. The separation zone is used to initially separate the generated particles from the wastewater, and the separated particles fall back to the fluidized reaction zone to continue the reaction.

[0011] The separation unit is connected to the wastewater outlet of the separation zone via a first outlet pipe, which is used to receive the separated wastewater and further purify it; the separation unit is connected to the fluidized reaction zone via a second outlet pipe, which is used to receive the reaction mixture and filter and recover the target particles.

[0012] The circulation unit includes a circulation pipe connected between the separation unit and the reactor, used to return small particles that have not formed target particles in the separation unit to the reactor to continue participating in the particle growth reaction.

[0013] In some technical solutions, the dosing unit is equipped with an alkali dosing device connected to the water inlet pipe;

[0014] The circulation unit is equipped with a pH measuring device, which includes:

[0015] The pH measuring tube is connected to the circulation tube and is used to guide part of the circulating liquid.

[0016] A pH measurement probe, installed inside a pH measurement tube, is used to detect the pH value of circulating liquids.

[0017] The alkali dosing device automatically adjusts the alkali addition rate and amount based on the pH value detected by the pH measuring probe to maintain the pH value in the reactor within the target range.

[0018] In some technical solutions, the reactor is also equipped with a gas distribution device, which includes a blower and a gas distribution pipeline connected to the blower. The gas distribution pipeline is located below the fluidized reaction zone and includes a main gas distribution pipe and several branch gas distribution pipes. The branch gas distribution pipes are evenly distributed on the cross-section of the reactor.

[0019] In some technical solutions, the water inlet unit also includes a water inlet pump and a water inlet flow meter, both of which are installed on the water inlet pipe. The flow rate setpoint of the water inlet flow meter is linked with the PID control of the water inlet pump to adjust the water inlet flow rate and ensure flow stability.

[0020] The circulation unit also includes a circulation pump and a circulation flow meter, both of which are installed on the circulation pipe. The flow rate setpoint of the circulation flow meter is linked to the PID control of the circulation pump to adjust the circulation flow rate and provide a stable upward flow velocity for the reactor.

[0021] In some technical solutions, the water inlet unit is also equipped with a water distribution pipeline, which includes a main water distribution pipe and several branch water distribution pipes. The main water distribution pipe is connected to the outlet end of the inlet pipe, and the branch water distribution pipes are evenly distributed across the cross-section of the reactor to uniformly supply wastewater into the reactor; and / or,

[0022] A liquid mixer is provided at the connection between the circulation pipe and the inlet pipe, or the outlet end of the circulation pipe is inserted obliquely into the center of the inlet pipe.

[0023] In some technical solutions, the separation unit includes an inclined screen separation device and a collection tank. The inclined screen separation device is used to separate target particles from wastewater, and the separated target particles enter the collection tank through a collection pipe.

[0024] The collection tank is connected to an external system via a discharge pipe. The discharge pipe is equipped with a discharge valve, and the opening of the discharge valve is automatically controlled by a level gauge. The level gauge automatically adjusts the opening of the discharge valve based on the change in the level of the collection tank.

[0025] In some technical solutions, the circulation unit further includes a circulation tank, which receives wastewater separated by the inclined screen separation device through a clean water pipe;

[0026] The collection tank is equipped with a drain pipe, which is a small-diameter pipe that can automatically drain water.

[0027] An overflow pipe is provided between the collection tank and the circulation tank. When the water volume is too large, sewage flows into the circulation tank through the overflow pipe.

[0028] The clean water outlet of the circulating tank is connected to the main water outlet pipe, and the wastewater outlet is connected to the circulating pipe for return to the reactor.

[0029] In some technical solutions, the reactor is also equipped with a sampling device for collecting mixed liquid at different heights in the reactor for particle morphology observation and analysis. When the particles are observed to meet the emission standards, the sampling device controls the second outlet pipe through a switch valve to discharge the mixed liquid rich in target particles.

[0030] In some technical solutions, the separation zone is equipped with a separation module, which includes multiple components that work together to perform solid-liquid separation:

[0031] The inlet channel and inlet hole are used to introduce the wastewater mixture into the separation module;

[0032] Inclined plates are used for solid-liquid separation, and the separated particles enter the collection tank through the mud plate and collection holes;

[0033] The collection tank is equipped with a ramp, which guides the particles back to the fluidized reaction zone to continue participating in the reaction.

[0034] The effluent branch channel and the effluent main channel are used to receive the purified wastewater, which then flows into the effluent main channel via a drop-down mechanism and is finally discharged from the reactor through the first effluent pipe.

[0035] The present invention, by adopting the above technical solution, has at least the following beneficial effects:

[0036] 1. This invention achieves highly efficient removal of nitrogen and phosphorus pollutants from wastewater through the synergistic effect of an optimized influent unit, reactor, separation unit, and circulation unit. The fluidized reaction zone promotes the generation and growth of target particles (struvite) through particle collision and aggregation. The separation unit fully recovers the target particles, while the circulation unit ensures the reuse of unreacted particles. The overall system significantly improves reaction efficiency, reduces particle loss, and minimizes the use of chemical reagents, providing an economical and efficient solution for treating high-pollution-load wastewater.

[0037] 2. This invention ensures the optimal alkaline environment (pH≥9) for the struvite formation reaction in wastewater through real-time linkage control of the alkali dosing device and the pH measuring device. This automated control method reduces unnecessary chemical reagent consumption, lowers operating costs, and improves reaction stability and the quality of generated particles, thus facilitating resource recycling.

[0038] 3. The uniformly distributed gas in this gas distribution device not only improves the exchange efficiency of dissolved gas in the reactor, but also reduces the amount of alkali to be added by removing dissolved CO2. The synergistic effect of gas and water distribution further enhances the suspension state and fluidization effect of the particles, avoids particle deposition, and significantly improves the efficiency and uniformity of particle growth.

[0039] 4. The PID linkage control of the inlet pump and circulation pump in this invention significantly improves the automation level of the system. Precise adjustment of the inlet and circulation flow rates ensures stable reaction conditions within the fluidized bed, providing a stable power foundation for the formation of large-particle struvite, while reducing operational complexity and the impact of human error.

[0040] 5. This sampling device can monitor the particle state inside the reactor in real time. By observing and analyzing the size and morphology of the particles, the reaction conditions can be adjusted in a timely manner. When the particle size reaches the discharge requirements, the mixture is accurately discharged through automatic control, improving the system's operational flexibility and processing efficiency.

[0041] 6. The multi-component collaborative design of the separation module in this utility model optimizes the efficiency of solid-liquid separation. Through the rational division of labor among the inlet channel, inclined plate, and mud slide, not only is efficient separation and reflux of particles achieved, but also resource waste is avoided, providing a stable guarantee for the resource recycling and further growth of particles. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings and their markings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0043] Figure 1 This is a schematic diagram of the overall structure of the wastewater treatment system in one embodiment of the present invention;

[0044] Figure 2 This is a top view of the air and water distribution device in one embodiment of the present invention;

[0045] Figure 3 This is a side view of the air and water distribution device in one embodiment of the present invention.

[0046] Figure 4 This is a schematic diagram of the connection between the circulation pipe and the inlet pipe in one embodiment of the present invention;

[0047] Figure 5 This is a top view of the separation module in one embodiment of the present invention;

[0048] Figure 6 for Figure 5 Schematic diagram of the cross-sectional structure in section 1-1;

[0049] Figure 7 for Figure 5 Schematic diagram of the cross-sectional structure in section 2-2.

[0050] The meanings of the symbols marked in the figure are as follows:

[0051] 1. Inlet pump; 2. Inlet flow meter; 3. Inlet pipe; 4. Alkali dosing device; 5. Magnesium salt dosing device; 6. Water distribution pipeline; 7. Sampling device; 8. Reactor; 9. Fluidized bed; 10. Separation module; 12. First outlet pipe; 13. Second outlet pipe; 14. Switch valve; 15. Inclined screen separation device; 16. Collection pipe; 17. Clean water pipe; 18. Main outlet pipe; 19. Collection tank; 20. Circulation tank; 21. pH measuring probe; 22. pH measuring tube; 23. Circulation pump; 24. Circulation pipe; 25. Circulation flow meter; 26. Discharge pipe; 27. Overflow pipe; 28. Discharge valve; 29. ​​Fan; 30. Gas distribution device; 31. Level gauge; 32. Spray pipe; 33. Drain pipe;

[0052] 301. Main gas distribution pipe; 302. Branch gas distribution pipe; 601. Main water distribution pipe; 602. Branch water distribution pipe;

[0053] 101. Inlet channel; 102. Inlet hole; 103. Outlet branch channel; 104. Outlet main channel; 105. Outlet main channel; 106. Sliding plate; 107. Collection channel; 108. Collection hole; 109. Inclined plate. Detailed Implementation

[0054] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without inventive work.

[0055] To keep the drawings concise, each figure only schematically shows the parts relevant to the utility model, and these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some figures, only one of the components with the same structure or function is schematically depicted, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one."

[0056] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0057] It should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0058] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0059] like Figure 1According to one embodiment of the wastewater treatment system of this utility model, it includes an inlet unit, a reactor 8, a separation unit, and a circulation unit. These modules are connected sequentially according to the process flow to form a closed-loop system. The inlet unit is also connected to a dosing unit. The inlet unit is used to transport wastewater to the reactor 8, and the dosing unit is used to add alkali to the wastewater to adjust the pH value and provide the required magnesium ions. The reactor 8 is provided with a fluidized reaction zone and a separation zone. The fluidized reaction zone promotes the generation and growth of struvite particles through particle collision and aggregation. The separation zone returns some of the generated particles to the fluidized reaction zone for further reaction through preliminary solid-liquid separation. The separation unit is used to receive the wastewater from the separation zone, further remove residual particles, and return the small particles to the reactor 8 for reuse through the circulation unit.

[0060] This embodiment achieves efficient removal and resource utilization of nitrogen and phosphorus pollutants by optimizing the wastewater treatment process. The system utilizes the fluidization reaction of particles to promote the formation and growth of struvite, and reduces particle loss through a circulation mechanism, thereby improving resource utilization. This design significantly improves wastewater treatment efficiency and reduces operating costs, making it particularly suitable for the efficient treatment of wastewater with high pollution loads.

[0061] In a preferred embodiment, the dosing unit includes an alkali dosing device 4 and a magnesium salt dosing device 5, both located on the inlet pipe 3 of the water inlet unit. The circulation unit includes a circulation pipe 24, on which a pH measuring device is installed. Specifically, the pH measuring device includes a pH measuring tube 22, connected to the circulation pipe 24, for guiding part of the circulating liquid; a pH measuring probe 21, installed inside the pH measuring tube 22, for detecting the pH value of the circulating liquid; a signal processing module, connected to the pH measuring probe 21, for receiving and processing the pH detection signal; and a control module, connected to the alkali dosing device 4, for adjusting the alkali dosage according to the processed signal. The alkali dosing device 4 automatically adjusts the alkali addition rate and dosage according to the control signal from the pH measuring device, so that the pH value in the reactor 8 is always maintained within the optimal range (≥9) for struvite formation, thereby optimizing the particle formation conditions.

[0062] This embodiment significantly improves the accuracy and efficiency of wastewater treatment by combining a dosing unit with a pH measuring device. Real-time monitoring of the circulating water's pH value and dynamic adjustment of the alkali and magnesium salt dosages ensure that reaction conditions are always within the optimal range for struvite formation (pH ≥ 9). This optimized design reduces excessive reagent use, lowers operating costs, and improves the efficiency and quality of struvite particle formation. Furthermore, the automated dosing control system greatly reduces the impact of human intervention on reaction stability, making the entire wastewater treatment process more efficient and controllable, and further enhancing the system's economic and environmental benefits.

[0063] More preferably, the circulation pipe 24 is equipped with a circulation pump 23 and a circulation flow meter 25. The flow rate setpoint of the circulation flow meter 25 is linked with the PID control of the circulation pump 23 to adjust the circulation flow rate and provide a stable upward flow rate for the reactor 8. The inlet pipe 3 is equipped with an inlet pump 1 and an inlet flow meter 2. The flow rate setpoint of the inlet flow meter 2 is linked with the PID control of the inlet pump 1 to adjust the inlet flow rate and ensure a stable flow rate.

[0064] In this embodiment, by introducing a flow control scheme, the precise adjustment of the flow rates of the circulation pipe 24 and the inlet pipe 3 is incorporated into the automated control system, achieving efficient operation and resource optimization in wastewater treatment. The inlet pipe 3 and the circulation pipe 24 are respectively equipped with a flow meter and a variable frequency pump. The flow meter monitors flow changes in real time, and the pump's operating frequency is dynamically adjusted through a PID linkage control system to ensure optimal matching between the inlet flow rate and the circulation flow rate. The optimization of the circulation flow rate not only maintains stable fluidization conditions within the reactor 8 but also effectively reduces the dosage of alkaline reagents by utilizing the high-pH circulating liquid reflux, while the stable inlet flow rate ensures the balance of the reactor 8's treatment capacity. This scheme has significant effects in reducing reagent consumption, improving particle generation efficiency, and enhancing system stability, further reducing the operating costs and complexity of the wastewater treatment process.

[0065] According to this embodiment, a liquid mixer is provided at the connection between the circulation pipe 24 and the water inlet pipe 3, or as follows: Figure 4 The outlet end of the circulation pipe 24 is inserted obliquely into the center of the inlet pipe 3. This allows the circulating water and the inlet water to mix thoroughly, avoiding the phenomenon that the inlet water only goes to some branch pipes, which would lead to uneven nutrition and uneven reaction in the fluidized bed 9.

[0066] In another preferred embodiment, in conjunction with reference to Figure 2 and Figure 3 The reactor 8 is equipped with an air distribution device 30 at the bottom. The air distribution device 30 includes a main air distribution pipe 301 and several branch air distribution pipes 302, which are evenly distributed at the bottom of the reactor 8. Airflow is provided by a blower 29 to remove dissolved CO2 from the wastewater and enhance hybrid power. In this scheme, the air distribution device 30 provides airflow through the evenly distributed branch air distribution pipes 302, which not only removes dissolved CO2 from the wastewater and increases the pH value, reducing the use of alkaline reagents, but also enhances the hybrid power within the reactor and prevents particulate sedimentation.

[0067] According to this embodiment, in conjunction with reference to Figure 2 and Figure 3The inlet unit is also equipped with a water distribution pipeline 6, which includes a main water distribution pipe 601 and several branch water distribution pipes 602. The main water distribution pipe 601 is connected to the outlet end of the inlet pipe 3. The branch water distribution pipes 602 are evenly distributed across the cross-section of the reactor 8 to uniformly supply wastewater into the reactor 8. In this design, the water flow from the branch water distribution pipes 602 impacts the bottom of the reactor 8 downwards, preventing particle deposition and enhancing the fluidization effect. The uniform water supply to the reactor 8 through the evenly distributed branch water distribution pipes 602 ensures sufficient contact and reaction between the wastewater and the particles. At the same time, the gas-liquid synergy further optimizes the fluidization conditions, promotes the growth and suspension of struvite particles, improves the particle generation efficiency and quality, and effectively reduces resource waste, significantly improving the overall efficiency and economy of wastewater treatment.

[0068] In one specific embodiment, such as Figure 5-7 The separation zone is equipped with a separation module 10, which includes multiple components that work together to perform solid-liquid separation: the inlet channel 101 and the inlet hole 102 are used to introduce the wastewater mixture into the separation module 10; the inclined plate 109 is used for solid-liquid separation, and the separated particles enter the collection tank 107 through the mud plate 106 and the collection hole 108; the collection tank 107 is equipped with a slope, and with the help of the slope, the particles are guided back to the fluidization reaction zone to continue to participate in the reaction; the outlet branch tank 103 and the outlet main tank 104 are used to receive the purified wastewater, which enters the outlet main tank 105 through a drop method, and is finally discharged from the reactor 8 through the first outlet pipe 12.

[0069] In this embodiment, the separation module 10 achieves efficient solid-liquid separation of particles in wastewater. The inclined plate structure increases the particle settling area, and the sliding plate 106 guides the deposited particles into the collection tank 107, enabling rapid recovery and recycling. At the same time, the purified wastewater is discharged through the effluent tank 105, with a significantly reduced particle content, meeting discharge requirements.

[0070] In another specific embodiment, the outlet of the separation module 10 is connected to the separation unit via a first outlet pipe 12, and the fluidized reaction zone is connected to the separation unit via a second outlet pipe 13. The separation unit includes an inclined screen separation device 15 and a collection tank 19. The inclined screen separation device 15 is connected to the first outlet pipe 12 and is used to receive the wastewater after preliminary separation for further purification. The inclined screen separation device 15 is connected to the second outlet pipe 13 and is used to receive the reaction mixture, filter and recover the target particles. The target particles separated by the inclined screen separation device 15 are sprayed into the collection pipe 16 by the spray pipe 32 and finally enter the collection tank 19. The collection tank 19 is connected to an external system via a discharge pipe 26. A discharge valve 28 is provided on the discharge pipe 26. The opening degree of the discharge valve 28 is automatically controlled by a level gauge 31. The level gauge 31 automatically adjusts the opening degree of the discharge valve 28 based on the level change in the collection tank 19, thereby realizing the resource recycling of the struvite particles.

[0071] According to this embodiment, the circulation unit also includes a circulation tank 20, which receives wastewater separated by the inclined screen separation device 15 through a clean water pipe 17; a collection tank 19 is provided with a drain pipe 33, which is a small-diameter pipe that can automatically drain water; an overflow pipe 27 is provided between the collection tank 19 and the circulation tank 20, so that when the water volume is too large, the sewage flows into the circulation tank 20 through the overflow pipe 27, preventing the sewage from overflowing to the ground and polluting the environment; the clean water outlet of the circulation tank 20 is connected to the main water outlet pipe 18, and the sewage outlet is connected to the circulation pipe 24 for return to the reactor 8.

[0072] In another preferred embodiment, the reactor 8 is also equipped with a sampling device 7, which is used to collect the mixed liquid at different heights in the reactor 8 for particle morphology observation and analysis. When it is observed that the particles meet the emission standards, the sampling device 7 controls the second outlet pipe 13 through the switch valve 14 to discharge the mixed liquid rich in target particles.

[0073] According to another embodiment of the present invention, the operating principle of the aforementioned wastewater treatment system is provided, including the following steps:

[0074] The nitrogen and phosphorus-rich wastewater is pumped to reactor 8 through inlet pump 1 and evenly distributed in reactor 8 through water distribution pipeline 6. The inlet flow rate is monitored and adjusted in real time by inlet flow meter 2.

[0075] The pH value in reactor 8 is controlled above 9 by using alkali dosing device 4, and magnesium salt dosing device 5 provides the required magnesium ions for the reaction to promote the formation of struvite particles.

[0076] Within reactor 8, particles are mixed and collided in fluidized bed 9 to form target particles. Simultaneously, solid-liquid separation is performed in separation module 10. The separated struvite particles are returned to fluidized bed 9. The purified wastewater enters inclined screen separation device 15 through first outlet pipe 12. Small particles that do not form target particles enter circulation tank 20 through clean water pipe 17 and are sent back to reactor 8 through circulation pump 23 and circulation pipe 24. Circulation flow meter 25 is used to monitor circulation flow in real time.

[0077] The sampling device 7 is used to observe the struvite mixture at different heights in the reactor 8 to observe the size and shape of the struvite particles. When the particles meet the discharge requirements, the switch valve 14 on the second outlet pipe 13 is opened to discharge the mixture rich in struvite particles. Under the action of the inclined screen separation device 15, large struvite particles enter the collection tank 19 through the collection pipe 16 and are discharged through the discharge pipe 26 for recycling.

[0078] Excess water in the collection tank 19 is discharged through the overflow pipe 27 into the circulation tank 20 and then pumped back to the reactor 8, thus preventing sewage from overflowing onto the ground and polluting the environment. It should be noted that the drain pipe 33 of the collection tank 19 is a small-diameter pipe that can automatically discharge the water in the tank. Only when the water volume is too large will it overflow into the circulation tank 20 through the overflow pipe 27.

[0079] The above-described embodiments are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the appended claims.

Claims

1. A wastewater treatment system, characterized in that, It includes an inlet unit, a reactor, a separation unit, and a circulation unit connected in sequence. The inlet unit is also connected to a dosing unit. The water inlet unit is equipped with a water inlet pipe, which is connected to the reactor and used to transport wastewater into the reactor. The dosing unit includes a device for adding at least one agent to wastewater to adjust reaction conditions and promote particle formation. The reactor is equipped with a fluidized reaction zone and a separation zone. The fluidized reaction zone is used to promote the generation and growth of particles through particle collision and aggregation. The separation zone is used to initially separate the generated particles from the wastewater, and the separated particles fall back to the fluidized reaction zone to continue the reaction. The separation unit is connected to the wastewater outlet of the separation zone via a first outlet pipe, which is used to receive the separated wastewater and further purify it; the separation unit is connected to the fluidized reaction zone via a second outlet pipe, which is used to receive the reaction mixture and filter and recover the target particles. The circulation unit includes a circulation pipe connected between the separation unit and the reactor, used to return small particles that have not formed target particles in the separation unit to the reactor to continue participating in the particle growth reaction.

2. The wastewater treatment system according to claim 1, characterized in that, The dosing unit is equipped with an alkali dosing device, which is connected to the water inlet pipe; The circulation unit is equipped with a pH measuring device, which includes: The pH measuring tube is connected to the circulation tube and is used to guide part of the circulating liquid. A pH measurement probe, installed inside a pH measurement tube, is used to detect the pH value of circulating liquids. The alkali dosing device automatically adjusts the alkali addition rate and amount based on the pH value detected by the pH measuring probe to maintain the pH value in the reactor within the target range.

3. The wastewater treatment system according to claim 1, characterized in that, The reactor is also equipped with a gas distribution device, which includes a blower and a gas distribution pipeline connected to the blower. The gas distribution pipeline is located below the fluidized reaction zone and includes a main gas distribution pipe and several branch gas distribution pipes. The branch gas distribution pipes are evenly distributed on the cross-section of the reactor.

4. The wastewater treatment system according to claim 1, characterized in that, The water inlet unit also includes a water inlet pump and a water inlet flow meter, both of which are installed on the water inlet pipe. The flow rate setpoint of the water inlet flow meter is linked with the PID control of the water inlet pump to adjust the water inlet flow rate and ensure flow stability. The circulation unit also includes a circulation pump and a circulation flow meter, both of which are installed on the circulation pipe. The flow rate setpoint of the circulation flow meter is linked to the PID control of the circulation pump to adjust the circulation flow rate and provide a stable upward flow velocity for the reactor.

5. The wastewater treatment system according to claim 1, characterized in that, The water inlet unit is also equipped with a water distribution pipeline, which includes a main water distribution pipe and several branch water distribution pipes. The main water distribution pipe is connected to the outlet end of the inlet pipe, and the branch water distribution pipes are evenly distributed across the cross-section of the reactor to uniformly supply wastewater into the reactor; and / or, A liquid mixer is provided at the connection between the circulation pipe and the inlet pipe, or the outlet end of the circulation pipe is inserted obliquely into the center of the inlet pipe.

6. The wastewater treatment system according to claim 1, characterized in that, The separation unit includes an inclined screen separation device and a collection tank. The inclined screen separation device is used to separate target particles from wastewater, and the separated target particles enter the collection tank through a collection pipe. The collection tank is connected to an external system via a discharge pipe. The discharge pipe is equipped with a discharge valve, and the opening of the discharge valve is automatically controlled by a level gauge. The level gauge automatically adjusts the opening of the discharge valve based on the change in the level of the collection tank.

7. The wastewater treatment system according to claim 6, characterized in that, The circulation unit also includes a circulation tank, which receives wastewater separated by the inclined screen separation device through a clean water pipe; The collection tank is equipped with a drain pipe, which is a small-diameter pipe that can automatically drain water. An overflow pipe is provided between the collection tank and the circulation tank. When the water volume is too large, sewage flows into the circulation tank through the overflow pipe. The clean water outlet of the circulating tank is connected to the main water outlet pipe, and the wastewater outlet is connected to the circulating pipe for return to the reactor.

8. The wastewater treatment system according to claim 1, characterized in that, The reactor is also equipped with a sampling device for collecting mixed liquid at different heights in the reactor to observe and analyze the particle morphology. When the particle size meets the emission standards, the sampling device controls the second outlet pipe through a switch valve to discharge the mixed liquid rich in the target particles.

9. The wastewater treatment system according to claim 1, characterized in that, The separation zone is equipped with a separation module, which includes multiple components that work together to perform solid-liquid separation: The inlet channel and inlet hole are used to introduce the wastewater mixture into the separation module; Inclined plates are used for solid-liquid separation, and the separated particles enter the collection tank through the mud plate and collection holes; The collection tank is equipped with a ramp, which guides the particles back to the fluidized reaction zone to continue participating in the reaction. The effluent branch channel and the effluent main channel are used to receive the purified wastewater, which then flows into the effluent main channel via a drop-down mechanism and is finally discharged from the reactor through the first effluent pipe.

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