An immersed ultrafiltration membrane pool structure based on continuous flow state
By introducing a flow guide plate and a return pipeline into the submerged ultrafiltration membrane tank, the flow pattern was optimized, solving the problems of rapid membrane fouling rate and high cleaning wastewater load, thus achieving stable operation of the membrane tank and reducing costs.
Patent Information
- Application Number
- CN202522613569.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-09
- Publication Date
- 2026-08-25
- Estimated Expiration
- 2035-12-09
AI Technical Summary
Existing submerged ultrafiltration membrane systems suffer from problems such as rapid membrane fouling rates, the need for frequent shutdowns for cleaning, and high cleaning wastewater loads.
The submerged ultrafiltration membrane tank adopts a continuous flow structure, optimizes the flow pattern through guide plates, recovers concentrated sludge mixture through return pipelines, and reduces membrane fouling and lowers cleaning frequency and wastewater volume through periodic air scouring.
It significantly extends the stable operation cycle of the membrane tank, reduces the frequency of downtime for cleaning, reduces the amount of cleaning wastewater, and lowers the investment and operating costs of the water treatment system.
Smart Images
Figure CN224677868U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of ultrafiltration technology, specifically to a submerged ultrafiltration membrane tank structure based on continuous flow. Background Technology
[0002] Submerged ultrafiltration membrane tanks are a filtration technology that directly immerses ultrafiltration membrane modules in the water to be treated. They are widely used in advanced drinking water treatment, wastewater reuse, and industrial wastewater treatment, offering advantages such as low-pressure operation, low energy consumption, and small footprint. However, current submerged ultrafiltration membrane tank treatment equipment has the following drawbacks: Currently, most mainstream submerged ultrafiltration membrane systems adopt an intermittent operation mode, that is, after a period of treatment, the system is shut down for backwashing to clean it. This has significant drawbacks: rapid membrane fouling rate: the water flow velocity on the membrane surface is low and the turbulence intensity is weak, so pollutants easily accumulate on the membrane surface, requiring frequent shutdowns for cleaning (backwashing, chemical cleaning) to restore flux, affecting continuous production; high cleaning wastewater load: the cleaning process (especially offline chemical cleaning and large-scale backwashing) generates a large amount of wastewater with high concentrations of suspended solids, significantly increasing the load and cost of subsequent wastewater treatment.
[0003] To address these issues, we propose a submerged ultrafiltration membrane tank structure based on continuous flow. Utility Model Content
[0004] The purpose of this invention is to provide a submerged ultrafiltration membrane tank structure based on continuous flow to solve the problems mentioned in the background art.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a submerged ultrafiltration membrane tank structure based on continuous flow, comprising a sedimentation tank assembly and multiple ultrafiltration membrane tank assemblies, wherein a return pipeline is provided between the sedimentation tank assembly and the multiple ultrafiltration membrane tank assemblies, a water distribution assembly is provided on the sidewall of the sedimentation tank assembly and the multiple ultrafiltration membrane tank assemblies, and a chemical washing wastewater pipeline, an aeration pipeline and a product water pipeline are connected to the multiple ultrafiltration membrane tank assemblies, and a sludge discharge pipeline is connected to the sedimentation tank assembly; The ultrafiltration membrane module includes a membrane tank. Two chamfers are fixed to the bottom sides of the membrane tank. The two chamfers are inclined on one side and the top surface of the chamfers is narrower than the bottom surface. A solid suspended matter collection chamber is formed between the two chamfers. A flow guide plate is fixedly installed inside the membrane tank above the chamfers. Multiple membrane modules are uniformly fixed inside the membrane tank above the flow guide plate. The flow guide plate includes multiple parallel strips and multiple parallel inclined plates. The multiple strips and multiple inclined plates are fixedly connected to each other. The bottom of the inclined plates is inclined towards the side closer to the return pipeline.
[0006] Preferably, the sedimentation tank assembly includes an inclined plate sedimentation tank and a flocculation tank. The flocculation tank is fixed to the side wall of the inclined plate sedimentation tank. A first baffle is fixed inside the flocculation tank. A second baffle is fixed between the inner side wall of the flocculation tank and the top of the middle part of the first baffle. A flocculation zone is formed inside the flocculation tank between it and the first baffle. A primary coagulation tank is formed inside the flocculation tank between it and one side of the first and second baffles. A secondary coagulation tank is formed inside the flocculation tank between it and the other side of the first and second baffles. A third baffle is fixed inside the inclined plate sedimentation tank near the flocculation tank. A main settling zone is formed inside the inclined plate sedimentation tank on the side away from the flocculation tank. A plug flow zone is formed inside the inclined plate sedimentation tank on the side near the flocculation tank. A bottom opening is formed between the bottom of the inclined plate sedimentation tank and the flocculation tank. An inlet pipe is fixed to the bottom of the flocculation tank. One end of the inlet pipe is connected to the secondary coagulation tank, and the other end of the inlet pipe is connected to the flocculation zone.
[0007] Preferably, the reflux pipeline includes a main reflux pipe and two reflux pumps. The main reflux pipe is fixedly connected to and connected to multiple reflux interfaces corresponding to multiple ultrafiltration membrane tank components. A mixed liquor reflux port is opened at the end of the membrane tank. The end of the reflux interface is fixedly connected to and connected to the mixed liquor reflux port. The main reflux pipe is fixedly connected to and connected to two first reflux sub-pipes near the two reflux pumps. The end of the first reflux sub-pipe is fixedly connected to and connected to the reflux pump. The two reflux pumps are fixedly connected to and connected to a second reflux sub-pipe. The end of the second reflux sub-pipe is located directly above the primary coagulation tank. A first flow meter is fixedly connected to and connected to the reflux interface. A second flow meter is fixedly connected to and connected to the first reflux sub-pipe.
[0008] Preferably, the water distribution assembly includes a water distribution channel, the end sidewall of which is fixed to the end of the inclined plate sedimentation tank, a drain outlet is opened on the top surface of the inclined plate sedimentation tank near the water distribution channel, a drain pipe is fixed to and connected to the end of the water distribution channel near the inclined plate sedimentation tank, multiple baffles are fixed to the water distribution channel near the inclined plate sedimentation tank, a membrane tank is fixed to and connected to an outlet pipe at one end near the water distribution channel, the outlet pipe is fixed to and connected to the water distribution channel, a baffle is vertically fixed to the inside of the membrane tank near the outlet pipe, and multiple water holes are horizontally opened on the top of the baffle.
[0009] Preferably, the sludge discharge pipeline includes two sludge pumps, which are fixedly connected to and connected to a first sludge discharge pipe. The end of the first sludge discharge pipe is fixedly connected to the bottom surface of the inclined plate sedimentation tank. The two sludge pumps are also fixedly connected to and connected to a second sludge discharge pipe. A return sludge pipe and a sludge discharge pipe are fixedly connected to and connected to the second sludge discharge pipe. The end of the return sludge pipe is fixedly connected to the bottom surface of the flocculation tank. The first sludge discharge pipe is connected to the main sedimentation zone, and the return sludge pipe is connected to the flocculation zone.
[0010] Preferably, the permeate pipeline includes a main outlet pipe and multiple permeate pumps. The multiple permeate pumps are located at the ends of the ultrafiltration membrane tank components. The permeate pumps are fixedly connected to and connected to the permeate pipe. The ends of the permeate pipes are fixedly connected to and connected to permeate branch pipes at the top of the multiple ultrafiltration membrane tank components. The sidewalls of the permeate branch pipes are fixedly connected to and connected to multiple permeate connectors corresponding to the positions of the multiple membrane components. A permeate outlet is opened on the top surface of the membrane component. The ends of the permeate connectors are fixedly connected to and connected to the permeate outlet. The permeate pumps are fixedly connected to and connected to the outlet sub-pipes. The ends of the outlet sub-pipes are fixedly connected to and connected to the sidewall of the main outlet pipe.
[0011] Preferably, the aeration pipeline includes a first aeration pipe and multiple aeration sub-pipes. The aeration sub-pipes are located above the ultrafiltration membrane tank assembly. Multiple aeration connectors are fixedly connected to and connected to the multiple membrane assembly positions on the aeration sub-pipes. An aeration port is opened at the top of the membrane assembly. The end of the aeration connector is fixedly connected to and connected to the aeration port. The aeration sub-pipe is fixedly connected to and connected to the first aeration pipe. The end of the first aeration pipe is fixedly connected to and connected to the second aeration pipe.
[0012] Preferably, a chemical washing wastewater discharge port is provided at the end of the membrane tank, the chemical washing wastewater pipeline includes a chemical washing wastewater pipe, the side wall of the chemical washing wastewater pipe is fixedly connected to and connected to multiple chemical washing wastewater connectors corresponding to the positions of multiple ultrafiltration membrane tank components, and the end of the chemical washing wastewater connector is fixedly connected to and connected to the chemical washing wastewater discharge port.
[0013] Compared with the prior art, the beneficial effects of this utility model are: This utility model's ultrafiltration membrane tank assembly incorporates a guide plate. The guide plate's unique structure not only guides sludge flow towards the solids collection chamber but, more importantly, optimizes the overall flow pattern within the membrane tank. This allows the water flow to effectively flush the membrane fibers, especially those in the middle and lower sections, and creates a cross-flow effect with the concentrate returning through the return pipe. The return pipe then recycles the concentrated sludge mixture to the sedimentation tank assembly, maintaining a stable concentration of solids within the membrane tank. This prevents excessive sludge accumulation. Furthermore, the water flow flushing of the membrane fibers, combined with periodic air scouring, effectively cleans the membrane surface, loosening and removing adhering contaminants, significantly mitigating membrane fouling, greatly extending the stable operating cycle, and reducing the frequency of downtime for cleaning. The return pipe also recycles the concentrated sludge mixture to the sedimentation tank assembly, allowing for continuous treatment of high-concentration sludge mixtures, greatly reducing the amount of low-concentration cleaning wastewater that needs to be treated. Attached Figure Description
[0014] Figure 1 These are schematic diagrams of the main body structure in the first and second embodiments of this utility model; Figure 2 These are schematic diagrams of the ultrafiltration membrane tank assembly in the first and second embodiments of this utility model; Figure 3These are cross-sectional structural diagrams of the ultrafiltration membrane tank assembly in the first and second embodiments of this utility model; Figure 4 These are schematic diagrams of the structure of the guide plate in the first and second embodiments of this utility model; Figure 5 This is a schematic diagram of the sedimentation tank component in the second embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of the return pipe in the second embodiment of this utility model; Figure 7 This is a schematic diagram of the bottom structure of the sedimentation tank component in the second embodiment of this utility model; Figure 8 This is a schematic diagram of the water distribution component in the second embodiment of the present invention; Figure 9 This is a schematic diagram of the sludge discharge pipe in the second embodiment of the present invention; Figure 10 This is a schematic diagram of the structure of the water production pipeline in the second embodiment of this utility model; Figure 11 This is a schematic diagram of the aeration pipeline in the second embodiment of the present invention; Figure 12 This is a schematic diagram of the structure of the medicinal herb washing wastewater pipeline in the second embodiment of this utility model.
[0015] In the diagram: 1. Sedimentation tank assembly; 2. Ultrafiltration membrane tank assembly; 3. Return pipeline; 4. Water distribution assembly; 5. Sludge discharge pipeline; 6. Product water pipeline; 7. Chemical washing wastewater pipeline; 8. Aeration pipeline; 11. Inclined plate sedimentation tank; 12. Flocculation tank; 13. First baffle; 14. Second baffle; 15. Flocculation zone; 16. Primary coagulation tank; 17. Secondary coagulation tank; 18. Third baffle; 19. Main settling zone; 110. Plug flow zone; 111. Bottom outlet; 112. Inlet pipe; 113. Drain outlet; 21. Membrane tank; 22. Membrane module; 23. Chamfer; 24. Solid suspended matter collection chamber; 25. Guide plate; 26. Aeration port; 27. Product water outlet; 28. Baffle; 29. Water hole; 210. Outlet pipe; 211. Mixed liquor return port. ; 212, Chemical washing wastewater discharge outlet; 251, strip plate; 252, inclined plate; 31, return pump; 32, main return pipe; 33, return interface; 34, first return sub-pipe; 35, second return sub-pipe; 36, first flow meter; 37, second flow meter; 41, water distribution channel; 42, baffle plate; 43, drain pipe; 51, sludge pump; 52, first sludge discharge pipe; 53, second sludge discharge pipe; 54, return sludge pipe; 55, sludge discharge pipe; 61, product water pump; 62, outlet sub-pipe; 63, outlet main pipe; 64, product water pipe; 65, product water branch pipe; 66, product water connector; 71, chemical washing wastewater pipe; 72, chemical washing wastewater connector; 81, first aeration pipe; 82, aeration sub-pipe; 83, aeration connector; 84, second aeration pipe. Detailed Implementation
[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example
[0017] Please see Figure 1-4 This utility model provides a technical solution: a submerged ultrafiltration membrane tank structure based on continuous flow, including a sedimentation tank component 1 and multiple ultrafiltration membrane tank components 2, a return pipeline 3 is provided between the sedimentation tank component 1 and the multiple ultrafiltration membrane tank components 2, a water distribution component 4 is provided on the side wall of the sedimentation tank component 1 and the multiple ultrafiltration membrane tank components 2, a chemical washing wastewater pipeline 7, an aeration pipeline 8 and a product water pipeline 6 are connected to the multiple ultrafiltration membrane tank components 2, and a sludge discharge pipeline 5 is connected to the sedimentation tank component 1; The ultrafiltration membrane module 2 includes a membrane tank 21. Two chamfers 23 are fixed to the bottom sides of the membrane tank 21. The two chamfers 23 are inclined on one side, and the top width of the chamfers 23 is smaller than the bottom width. A solid suspended matter collection chamber 24 is formed between the two chamfers 23. A guide plate 25 is fixedly installed above the chamfers 23 inside the membrane tank 21. Multiple membrane modules 22 are uniformly fixed above the guide plate 25 inside the membrane tank 21. The guide plate 25 includes multiple parallel strips 251 and multiple parallel inclined plates 252, which are fixedly connected to each other. The bottom of the inclined plates 252 faces... The inclined side near the return pipe 3 and the special structure of the guide plate 25 not only guide the sludge to the solids collection chamber 24, but more importantly, optimize the overall flow pattern in the membrane tank 21. This allows the water flow to effectively wash the membrane fibers, especially the middle and lower membrane fibers, and create a cross-flow effect with the concentrate returned by the return pipe 3. The concentrated sludge mixture is recycled to the sedimentation tank component 1 through the return pipe 3, thus maintaining the stability of the solids concentration in the membrane tank 21. There is no need to use backwashing for cleaning; only periodic air scrubbing is needed to clean the membrane surface, loosen and remove the attached pollutants on the membrane surface, and work together with the generated cross-flow to maintain the membrane flux. Example
[0018] Please see Figure 1-12 This is the second embodiment of the present invention. Based on the previous embodiment, the sedimentation tank assembly 1 includes an inclined plate sedimentation tank 11 and a flocculation tank 12. The flocculation tank 12 is fixedly connected to the side wall of the inclined plate sedimentation tank 11. A first partition 13 is fixedly connected inside the flocculation tank 12. A second partition 14 is fixedly connected between an inner side wall of the flocculation tank 12 and the top of the middle portion of the first partition 13. A flocculation zone 15 is formed between the interior of the flocculation tank 12 and the first partition 13. A primary coagulation tank 16 is formed between the interior of the flocculation tank 12 and one side of the first partition 13 and the second partition 14. A secondary coagulation tank 17 is opened between the first partition 13 and the other side of the second partition 14. A third partition 18 is fixedly connected to the inclined plate sedimentation tank 11 near the flocculation tank 12. A main settling zone 19 is opened inside the inclined plate sedimentation tank 11 on the side away from the flocculation tank 12. A plug flow zone 110 is opened inside the inclined plate sedimentation tank 11 on the side near the flocculation tank 12. A bottom opening 111 is opened between the bottom of the inclined plate sedimentation tank 11 and the bottom of the flocculation tank 12. An inlet pipe 112 is fixedly connected to the bottom of the flocculation tank 12. One end of the inlet pipe 112 is connected to the secondary coagulation tank 17, and the other end of the inlet pipe 112 is connected to the flocculation zone 15.
[0019] The reflux pipeline 3 includes a main reflux pipe 32 and two reflux pumps 31. The main reflux pipe 32 is fixedly connected to and connected to multiple reflux interfaces 33 at the positions of multiple ultrafiltration membrane tank components 2. A mixed liquor reflux port 211 is opened at the end of the membrane tank 21. The end of the reflux interface 33 is fixedly connected to and connected to the mixed liquor reflux port 211. The main reflux pipe 32 is fixedly connected to and connected to two first reflux sub-pipes 34 near the two reflux pumps 31. The end of the first reflux sub-pipe 34 is fixedly connected to and connected to the reflux pumps 31. The two reflux pumps 31 are fixedly connected to and connected to a second reflux sub-pipe 35. The end of the second reflux sub-pipe 35 is located directly above the primary coagulation tank 16. A first flow meter 36 is fixedly connected to and connected to the reflux interface 33. A second flow meter 37 is fixedly connected to and connected to the first reflux sub-pipe 34.
[0020] The water distribution assembly 4 includes a water distribution channel 41. The end sidewall of the water distribution channel 41 is fixed to the end of the inclined plate sedimentation tank 11. A drain outlet 113 is opened on the top surface of the inclined plate sedimentation tank 11 near the water distribution channel 41. A drain pipe 43 is fixed to and connected to the end of the water distribution channel 41 near the inclined plate sedimentation tank 11. Multiple baffles 42 are fixed to the end of the water distribution channel 41 near the inclined plate sedimentation tank 11. A membrane tank 21 is fixed to and connected to one end of the water distribution channel 41 and connected to an outlet pipe 210. The outlet pipe 210 is fixed to and connected to the water distribution channel 41. A baffle 28 is vertically fixed inside the membrane tank 21 near the outlet pipe 210. Multiple water holes 29 are horizontally opened on the top of the baffle 28.
[0021] The sludge discharge pipeline 5 includes two sludge pumps 51, which are fixedly connected to and connected to a first sludge discharge pipe 52. The end of the first sludge discharge pipe 52 is fixedly connected to the bottom surface of the inclined plate sedimentation tank 11. The two sludge pumps 51 are also fixedly connected to and connected to a second sludge discharge pipe 53. The second sludge discharge pipe 53 is fixedly connected to and connected to a return sludge pipe 54 and a sludge discharge pipe 55. The end of the return sludge pipe 54 is fixedly connected to the bottom surface of the flocculation tank 12. The first sludge discharge pipe 52 is connected to the main settling zone 19, the return sludge pipe 54 is connected to the flocculation zone 15, and the end of the sludge discharge pipe 55 is connected to an independent sludge treatment unit.
[0022] The permeate pipeline 6 includes a main outlet pipe 63 and multiple permeate pumps 61. The multiple permeate pumps 61 are located at the end of the ultrafiltration membrane tank assembly 2. The permeate pumps 61 are fixedly connected to and connected to the permeate pipe 64. The end of the permeate pipe 64 is located at the top of the multiple ultrafiltration membrane tank assembly 2 and is fixedly connected to and connected to the permeate branch pipe 65. The side wall of the permeate branch pipe 65 is fixedly connected to and connected to multiple permeate connectors 66 at the positions of multiple membrane modules 22. A permeate outlet 27 is opened on the top surface of the membrane module 22. The end of the permeate connector 66 is fixedly connected to and connected to the permeate outlet 27. The permeate pumps 61 are fixedly connected to and connected to the outlet sub-pipe 62. The end of the outlet sub-pipe 62 is fixedly connected to and connected to the side wall of the main outlet pipe 63. The end of the main outlet pipe 63 is connected to the permeate storage equipment.
[0023] The aeration pipeline 8 includes a first aeration pipe 81 and multiple aeration sub-pipes 82. The aeration sub-pipes 82 are located above the ultrafiltration membrane tank assembly 2. Multiple aeration connectors 83 are fixedly connected to and connected to the positions of multiple membrane modules 22 on the aeration sub-pipes 82. An aeration port 26 is opened at the top of the membrane module 22. The aeration connector 83 is fixedly connected to and connected to the aeration port 26 at its end. The aeration sub-pipe 82 is fixedly connected to and connected to the first aeration pipe 81. The end of the first aeration pipe 81 is fixedly connected to and connected to the second aeration pipe 84. The end of the second aeration pipe 84 is connected to the aeration supply equipment.
[0024] A chemical washing wastewater discharge port 212 is opened at the end of the membrane tank 21. The chemical washing wastewater pipeline 7 includes a chemical washing wastewater pipe 71. The side wall of the chemical washing wastewater pipe 71 is fixedly connected to and connected to multiple chemical washing wastewater connectors 72 at the positions of multiple ultrafiltration membrane tank components 2. The end of the chemical washing wastewater connectors 72 is fixedly connected to and connected to the chemical washing wastewater discharge port 212. The end of the chemical washing wastewater pipe 71 is connected to the chemical cleaning equipment.
[0025] In use, water flows evenly through the water distribution and guiding zone and mainly flows into the top of the ultrafiltration membrane tank assembly 2. Ultrafiltration is performed through the membrane assembly 22, while the permeate pump 61 draws in the permeate, stabilizing the permeate output. The water flows through the guide plate 25, and sludge is introduced into the solid suspended matter collection chamber 24. Then, the concentrated sludge mixture is drawn into the primary coagulation tank 16 of the sedimentation tank assembly 1 by the return pump 31 in the return pipe 3. It then flows into the secondary coagulation tank 17 through the bottom of the second baffle 14, and then into the flocculation zone 15 through the inlet pipe 112. It then enters the plug flow zone 110 through the bottom outlet 111, and after reaching a certain height, it passes over the third baffle 18 and enters the main settling zone 19. After sedimentation, the supernatant flows through the drain outlet 113. The water flows into the distribution channel 41. During the treatment process, the aeration equipment aerates the water through the aeration pipeline 8, and the chemical cleaning equipment cleans the water through the chemical cleaning wastewater pipeline 7. This utility model adopts a multi-membrane tank linkage structure, membrane frame assembly, and a matching recovery device (sedimentation tank assembly 1). It is mainly used for membrane filtration needs such as large-scale deep sewage treatment and water purification. This utility model makes innovative breakthroughs in system structure and logical application, significantly reducing the investment and operating costs of ultrafiltration membrane water treatment and enhancing its system operation reliability and stability. By controlling the transmembrane pressure difference through continuous flow and recovering and reducing pollutant indicators (suspended solids SS) during the process, it achieves the purpose of continuous and stable water production by submerged ultrafiltration membrane. The ultrafiltration membrane tank assembly 2 has flow guiding capacity. The system effectively guides pollutant indicators into the solid suspended matter collection chamber 24 through flow and gravity, and carries them out through the reflux system, thereby maintaining a stable pollutant concentration within the membrane tank, steadily reducing pollutant adhesion to the membrane material surface, effectively establishing the membrane tank environment and membrane material operating conditions, and significantly slowing down the membrane fouling process. High-concentration pollutant indicators (solid suspended matter SS) carried out by the reflux are continuously introduced into the sedimentation tank component 1 for centralized interception, concentrated treatment, and then discharged from the system. The reflux liquid, after pollutant reduction, is distributed and reintroduced into the membrane tank to participate in establishing a continuous flow pattern of a certain intensity, controlling and increasing the overall flow velocity inside the membrane tank. The flow pattern design, combined with air washing, effectively scrubs the membrane fiber surface, removing pollutants from the membrane material surface. The waste is brought into the recycling module; multiple ultrafiltration membrane tank components 2 are combined and linked, with multiple membrane tanks 21 paired with a set of return pipelines 3 and sedimentation tank components 1. The return flow rate (proportion) can be comprehensively adjusted through the pump and valve system to achieve the purpose of separately controlling the flow state of the membrane tank and the concentration of pollutants. The overall system is compactly designed, and the return and recycling device has a very low head loss. It only needs to be pumped with low energy consumption to establish the return flow rate (proportion) required for system control. Through instruments such as transmembrane pressure difference, suspended solids, flow meters, and level gauges, and using software such as intelligent AI algorithms, visualization software, and big data models, and relying on variable frequency water pumps, intelligent valves, and IoT control equipment, the process requirements of dynamic flow control and pollutant recovery are achieved.The ultrafiltration membrane tank assembly 2 of this utility model is equipped with a guide plate 25. The special structure of the guide plate 25 not only guides the sludge flow to the solids collection chamber 24, but more importantly, it optimizes the overall flow pattern within the membrane tank 21. This allows the water flow to effectively flush the membrane fibers, especially those in the middle and lower parts, and creates a cross-flow effect with the concentrated liquid returning through the return pipe 3. Then, the concentrated sludge mixture is recycled back to the sedimentation tank assembly 1 through the return pipe 3. This maintains the stability of the solids concentration within the membrane tank 21, and, in conjunction with the water flow flushing the membrane fibers, it also helps to achieve the desired effect. Periodic air wiping can clean the membrane surface, loosening and removing adhering contaminants, significantly mitigating membrane fouling, greatly extending the stable operating cycle, reducing the frequency of downtime for cleaning, and the return pipeline 3 recovers the concentrated sludge mixture to the sedimentation tank component 1. High-concentration sludge mixture is continuously drawn out for treatment, greatly reducing the amount of low-concentration cleaning wastewater that needs to be treated. This invention achieves continuous and uninterrupted water production, creatively proposing an operating mode that replaces the periodic water production and cleaning of submerged membrane filtration systems through a return and recovery method. The new design eliminates the need for water shutdown, venting, and cleaning steps required in conventional submerged membrane filtration processes, revolutionizing the pursuit of maximum recovery rates in submerged membrane systems. The designed process uses the membrane filtration system for contaminant reduction in a low-cost manner. By controlling the transmembrane pressure difference for low-energy water production, low-energy interception and return, low air wiping ratio, low wastewater discharge rate, and low chemical air wiping frequency, it improves operational stability while significantly reducing the investment and operating costs of the water treatment system.
[0026] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A submerged ultrafiltration membrane tank structure based on continuous flow, comprising a sedimentation tank assembly (1) and multiple ultrafiltration membrane tank assemblies (2), characterized in that: A return pipeline (3) is provided between the sedimentation tank assembly (1) and the multiple ultrafiltration membrane tank assemblies (2). A water distribution assembly (4) is provided on the side wall of the sedimentation tank assembly (1) and the multiple ultrafiltration membrane tank assemblies (2). A chemical washing wastewater pipeline (7), an aeration pipeline (8) and a product water pipeline (6) are connected to the multiple ultrafiltration membrane tank assemblies (2). A sludge discharge pipeline (5) is connected to the sedimentation tank assembly (1). The ultrafiltration membrane tank assembly (2) includes a membrane tank (21). Two chamfers (23) are fixed to the bottom sides of the membrane tank (21). The two chamfers (23) are inclined on one side. The top surface width of the chamfers (23) is smaller than the bottom surface width. A solid suspended matter collection chamber (24) is opened between the two chamfers (23). A guide plate (25) is fixedly installed inside the membrane tank (21) above the chamfers (23). Multiple membrane modules (22) are uniformly fixed inside the membrane tank (21) above the guide plate (25). The guide plate (25) includes multiple parallel strips (251) and multiple parallel inclined plates (252). The multiple strips (251) and multiple inclined plates (252) are fixed to each other. The bottom of the inclined plate (252) is inclined towards the side close to the return pipe (3).
2. The submerged ultrafiltration membrane tank structure based on continuous flow as described in claim 1, characterized in that: The sedimentation tank assembly (1) includes an inclined plate sedimentation tank (11) and a flocculation tank (12). The flocculation tank (12) is fixed to the side wall of the inclined plate sedimentation tank (11). A first partition (13) is fixed inside the flocculation tank (12). A second partition (14) is fixed between one inner side wall of the flocculation tank (12) and the top of the middle part of the first partition (13). A flocculation zone (15) is opened between the inside of the flocculation tank (12) and the first partition (13). A primary coagulation tank (16) is opened between the inside of the flocculation tank (12) and one side of the first partition (13) and the second partition (14). A secondary coagulation tank (17) is opened between the two sides. A third partition (18) is fixedly connected to the inclined plate sedimentation tank (11) near the flocculation tank (12). A main settling zone (19) is opened on the side of the inclined plate sedimentation tank (11) away from the flocculation tank (12). A plug flow zone (110) is opened on the side of the inclined plate sedimentation tank (11) near the flocculation tank (12). A bottom opening (111) is opened between the bottom of the inclined plate sedimentation tank (11) and the bottom of the flocculation tank (12). An inlet pipe (112) is fixedly connected to the bottom of the flocculation tank (12). One end of the inlet pipe (112) is connected to the secondary coagulation tank (17), and the other end of the inlet pipe (112) is connected to the flocculation zone (15).
3. The submerged ultrafiltration membrane tank structure based on continuous flow as described in claim 2, characterized in that: The reflux pipeline (3) includes a reflux main pipe (32) and two reflux pumps (31). The reflux main pipe (32) is fixedly connected to and connected to multiple reflux interfaces (33) at the positions of multiple ultrafiltration membrane tank components (2). A mixed liquor reflux port (211) is opened at the end of the membrane tank (21). The end of the reflux interface (33) is fixedly connected to and connected to the mixed liquor reflux port (211). The reflux main pipe (32) is fixedly connected to and connected to two first reflux sub-pipes (34) near the two reflux pumps (31). The end of the first reflux sub-pipe (34) is fixedly connected to and connected to the reflux pump (31). The two reflux pumps (31) are fixedly connected to and connected to a second reflux sub-pipe (35). The end of the second reflux sub-pipe (35) is located directly above the primary coagulation tank (16). A first flow meter (36) is fixedly connected to and connected to the reflux interface (33). A second flow meter (37) is fixedly connected to and connected to the first reflux sub-pipe (34).
4. The submerged ultrafiltration membrane tank structure based on continuous flow as described in claim 2, characterized in that: The water distribution assembly (4) includes a water distribution channel (41), the end sidewall of which is fixed to the end of the inclined plate sedimentation tank (11). A drain outlet (113) is opened on the top surface of the inclined plate sedimentation tank (11) near the water distribution channel (41). A drain pipe (43) is fixed to and connected to the end of the water distribution channel (41) near the inclined plate sedimentation tank (11). Multiple baffles (42) are fixed to the water distribution channel (41) near the inclined plate sedimentation tank (11). A drain pipe (210) is fixed to and connected to one end of the membrane tank (21) near the water distribution channel (41). The drain pipe (210) is fixed to and connected to the water distribution channel (41). A baffle (28) is vertically fixed to the inside of the membrane tank (21) near the drain pipe (210). Multiple water holes (29) are horizontally opened on the top of the baffle (28).
5. The submerged ultrafiltration membrane tank structure based on continuous flow as described in claim 2, characterized in that: The sludge discharge pipeline (5) includes two sludge pumps (51). The two sludge pumps (51) are fixedly connected to and connected to a first sludge discharge pipe (52). The end of the first sludge discharge pipe (52) is fixedly connected to the bottom surface of the inclined plate sedimentation tank (11). The two sludge pumps (51) are also fixedly connected to and connected to a second sludge discharge pipe (53). The second sludge discharge pipe (53) is fixedly connected to and connected to a return sludge pipe (54) and a sludge discharge pipe (55). The end of the return sludge pipe (54) is fixedly connected to the bottom surface of the flocculation tank (12). The first sludge discharge pipe (52) is connected to the main sedimentation zone (19). The return sludge pipe (54) is connected to the flocculation zone (15).
6. The submerged ultrafiltration membrane tank structure based on continuous flow as described in claim 1, characterized in that: The water production pipeline (6) includes a main water outlet (63) and multiple water production pumps (61). The multiple water production pumps (61) are located at the end of the ultrafiltration membrane tank assembly (2). The water production pumps (61) are fixedly connected to and connected to the water production pipe (64). The end of the water production pipe (64) is located at the top of the multiple ultrafiltration membrane tank assemblies (2) and is fixedly connected to and connected to the water production branch pipe (65). The side wall of the water production branch pipe (65) is fixedly connected to and connected to multiple water production connectors (66) at the positions of multiple membrane assemblies (22). The top surface of the membrane assembly (22) has a water production port (27). The end of the water production connector (66) is fixedly connected to and connected to the water production port (27). The water production pumps (61) are fixedly connected to and connected to the water outlet sub-pipe (62). The end of the water outlet sub-pipe (62) is fixedly connected to and connected to the side wall of the main water outlet (63).
7. The submerged ultrafiltration membrane tank structure based on continuous flow as described in claim 1, characterized in that: The aeration pipeline (8) includes a first aeration pipe (81) and multiple aeration sub-pipes (82). The aeration sub-pipes (82) are located above the ultrafiltration membrane tank assembly (2). Multiple aeration connectors (83) are fixedly connected to and connected to multiple membrane modules (22) on the aeration sub-pipes (82). An aeration port (26) is opened at the top of the membrane module (22). The aeration connector (83) is fixedly connected to and connected to the aeration port (26) at its end. The aeration sub-pipes (82) are fixedly connected to and connected to the first aeration pipe (81). The first aeration pipe (81) is fixedly connected to and connected to the second aeration pipe (84) at its end.
8. The submerged ultrafiltration membrane tank structure based on continuous flow as described in claim 1, characterized in that: The membrane tank (21) has a chemical washing wastewater discharge port (212) at its end. The chemical washing wastewater pipeline (7) includes a chemical washing wastewater pipe (71). The side wall of the chemical washing wastewater pipe (71) is fixedly connected to and connected to multiple chemical washing wastewater connectors (72) at the positions of multiple ultrafiltration membrane tank components (2). The end of the chemical washing wastewater connector (72) is fixedly connected to and connected to the chemical washing wastewater discharge port (212).