Integrated device for wastewater treatment

Abstract

The utility model discloses an integrated device for wastewater treatment in the technical field of sewage treatment. The integrated device comprises a sedimentation tank, a backwashing assembly, a microfiltration membrane assembly, a pipeline assembly, an inclined partition plate, a self-priming pump and a water outlet pump, according to the utility model, the problems of low operation efficiency and high cost caused by difficult disposal of chemical sludge generated during aquaculture wastewater treatment and frequent shutdown and cleaning of the microfiltration membrane assembly are solved; an inclined pipe is arranged in the sedimentation tank, so that most suspended matters are removed, the subsequent decontamination pressure is reduced, and continuous high-flux operation of the microfiltration membrane assembly is ensured; meanwhile, on-line backwashing of the micro-filtration membrane assembly is realized by adopting the micro-filtration membrane assembly made of the glass fiber tube and utilizing valve conversion, so that the initial flux of the micro-filtration membrane assembly is increased, and high-flux operation of the micro-filtration membrane assembly is ensured; besides, a process of combining an A / O process and a biofilm process is adopted, and an anoxic biological fluidized bed and an aerobic biological fluidized bed are arranged, so that the device is suitable for treating low-concentration wastewater and is matched with the characteristic of light pollution of the filtered aquaculture wastewater.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, specifically to an integrated wastewater treatment device. Background Technology

[0002] my country's aquaculture industry has developed rapidly, but while increasing economic benefits, it has also brought environmental pollution problems. Compared with domestic sewage, aquaculture wastewater is characterized by large discharge volume, fewer types of pollutants, lower concentrations, and higher suspended solids. Aquaculture wastewater pollutants can be broadly classified into two categories: organic pollutants and inorganic pollutants. Currently, aquaculture wastewater is mainly treated using three-stage sedimentation tanks, but sedimentation alone is insufficient to meet discharge standards, necessitating the addition of flocculants. Due to the large discharge volume, this significantly increases treatment costs and generates substantial amounts of chemical sludge pollution, hindering its widespread adoption.

[0003] For example, the patent CN112777728A discloses a "membrane biological aerated filter," which includes a biological aerated filter. The biological aerated filter comprises a tank body, a water distribution plate, an air distribution pipe, and packing material. The top of the tank body is open, and the water distribution plate is installed in the middle of the tank body, enclosing the bottom of the tank body to form an anaerobic zone. The anaerobic zone is connected to the outside through an inlet pipe and an outlet pipe. Packing material is filled above the water distribution plate, and the air distribution pipe is installed on the water distribution plate. The filter also includes a support frame, a membrane module, a self-priming pump, and a product water tank. The support frame is installed above the water distribution plate, the packing material is located below the support frame, and the membrane module is fixedly installed on the support frame. The effluent outlet of the membrane module is connected to the product water tank through the self-priming pump. By combining the membrane module with the biological aerated filter, the concentration and sludge-water separation efficiency of the biological aerated filter are improved, thereby improving the overall efficiency of wastewater treatment and showing good application prospects.

[0004] However, during use, membrane modules are prone to reduced flux due to sludge accumulation, and chemical sludge pollution is difficult to treat, requiring frequent shutdowns for cleaning, which increases maintenance costs. Utility Model Content

[0005] The purpose of this invention is to provide an integrated wastewater treatment device to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an integrated wastewater treatment device, comprising a sedimentation tank, a backwashing assembly, a microfiltration membrane assembly, a pipeline assembly, an inclined baffle, a baffle plate, a self-priming pump, and an effluent pump;

[0007] The sedimentation tank includes a primary sedimentation tank, a primary filter tank, an anoxic tank, an aerobic tank, a filter tank, and a clear water tank connected in sequence.

[0008] The primary sedimentation tank and the primary filter tank are separated by an inclined baffle. The upper part of the primary sedimentation tank is equipped with an inclined tube, which is arranged at an inclination to the horizontal direction, and the side wall of the inclined tube is in contact with the inclined baffle.

[0009] The piping assembly includes an inclined pipe, a suction pipe, a main pipe, a self-priming pump outlet pipe, and a clear water tank inlet pipe;

[0010] The microfiltration membrane module includes a first microfiltration membrane module and a second microfiltration membrane module. The first microfiltration membrane module is located above the primary filter tank and to the right of the baffle, and is connected to a self-priming pump via a suction pipe. The second microfiltration membrane module is located above the filter tank and is connected to an effluent pump via a pipe.

[0011] The self-priming pump is connected to the lower part of the anoxic pool through the self-priming pump outlet pipe, and the outlet pump is connected to the clear water pool through the clear water pool inlet pipe.

[0012] The suction pipe and the pipeline are connected in parallel. After being connected in parallel, they are connected to the clear water tank through the clear water tank inlet pipe. The parallel pipeline is equipped with a backwashing component.

[0013] Preferably, the backwashing assembly includes a water pump, a first valve, a second valve, a third valve, and an on / off valve. The first valve is installed on a branch pipe that branches off from the water pump inlet and connects to the clear water tank inlet pipe. The second valve is installed on a branch pipe that connects the pipe and the suction pipe in parallel and connects to the clear water tank inlet pipe. A branch pipe branches off from the pipe and connects to the suction pipe in parallel. The third valve is installed on the same branch pipe. The on / off valve is installed on the pipe that connects to the water pump inlet and on the pipe where the first valve is not located.

[0014] Preferably, the bottom of the primary sedimentation tank is provided with a first inclined plate with an inclination angle greater than 55° around the perimeter, and the first inclined plate around the perimeter forms a sludge discharge port.

[0015] Preferably, a second inclined plate with an inclination angle greater than 55° is provided around the bottom of the primary filter tank, and the second inclined plate around the bottom forms a sludge discharge port.

[0016] Preferably, suspended packing material is provided between the aerobic tank and the anoxic tank. The suspended packing material is lightweight ceramsite or PE multifaceted hollow spheres.

[0017] Preferably, filter screens with mesh openings smaller than the suspended packing are provided above and below the suspended packing, and the filter screens of the aerobic tank and the anoxic tank are fixed to the tank walls of the aerobic tank and the anoxic tank, respectively.

[0018] Preferably, an aeration disc is installed at the bottom of the aerobic tank, and the aeration disc is connected to a blower through an aeration pipe.

[0019] Preferably, an aeration disc is provided below the second microfiltration membrane assembly of the filtration tank, and the aeration disc is connected to the blower through an aeration pipe.

[0020] Preferably, the microfiltration membrane module is made of glass fiber tube.

[0021] Compared with existing technologies, the beneficial effects of this utility model are as follows: Utilizing the high inorganic content and good settling properties of aquaculture wastewater, most suspended solids are removed by installing inclined tubes in the sedimentation tank, reducing the pressure on subsequent influent pollutant treatment. Simultaneously, taking advantage of the low microbial count and difficulty in secreting extracellular polymers (the main cause of membrane fouling) in the water before biochemical treatment, a microfiltration membrane module is used for continuous high-flux filtration of the raw water. Furthermore, the microfiltration membrane module, made of fiberglass tubing, has a high initial flux and is inexpensive. Based on this, online backwashing of the microfiltration membrane module is achieved through valve switching, alleviating fouling and maintaining high-flux operation. In addition, the biochemical treatment section employs a combination of A / O process and biofilm method, setting up anoxic and aerobic biological fluidized beds, suitable for treating low-concentration wastewater, which aligns with the low-pollution characteristics of the filtered aquaculture wastewater. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of 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.

[0023] Figure 1 This is a schematic diagram of the structure of this utility model;

[0024] Figure 2 This is a top view of the present invention.

[0025] 1. Primary sedimentation tank; 2. Primary filter tank; 3. Anoxic tank; 4. Aerobic tank; 5. Filtration tank; 6. Clear water tank; 7. Inlet pipe; 8. First inclined plate; 9. Inclined tube; 10. Inclined baffle; 11. Second inclined plate; 12. First microfiltration membrane module; 13. Baffle; 14. Suction pipe; 15. Self-priming pump; 16. Inlet valve; 17. Self-priming pump outlet pipe; 18. Suspended packing; 19. Filter screen; 20. Baffle; 21. Flow promoter; 22. 23. Outlet; 24. Aeration disc; 25. Aeration pipe; 26. Blower; 27. Aeration pipe valve; 28. Second microfiltration membrane module; 29. ​​Pipeline; 20. Water pump; 31. Clear water tank inlet pipe; 32. Water outlet valve; 33. First valve; 34. Second valve; 35. Third valve; 36. Sludge discharge valve; 37. First sludge discharge valve; 38. Second sludge discharge valve; 39. On / off valve; 40. Water outlet pipe. Detailed Implementation

[0026] 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 skilled in the art without creative effort are within the protection scope of the present utility model.

[0027] One embodiment of this utility model:

[0028] like Figures 1-2 As shown, the system includes a sedimentation tank, valve assembly, microfiltration membrane assembly, piping assembly, self-priming pump 15, effluent pump 29, inclined plate, inclined baffle 10, aeration disc 23, aeration pipe 24, blower 25, aeration pipe valve 26, baffle 13, suspended packing 18, filter screen 19, baffle 20, and flow promoter 21. Both the self-priming pump 15 and the effluent pump 29 are unidirectional pumps.

[0029] The sedimentation tank includes a primary sedimentation tank 1, a primary filter tank 2, an anoxic tank 3, an aerobic tank 4, a filter tank 5, and a clear water tank 6 arranged from left to right. The primary sedimentation tank 1 and the primary filter tank 2 are separated by an inclined partition 10, and adjacent tanks of the primary filter tank 2, anoxic tank 3, aerobic tank 4, filter tank 5, and clear water tank 6 are separated by partitions 20.

[0030] The piping assembly includes an inlet pipe 7, an inclined pipe 9, a suction pipe 14, a self-priming pump outlet pipe 17, an aeration pipe 24, a pipe 28, a clear water tank inlet pipe 30, and an outlet pipe 40. The inlet pipe 7 is connected at one end to the middle of the primary sedimentation tank 1 and at the other end to the wastewater, introducing the water requiring decontamination into the primary sedimentation tank 1 through the inlet pipe 7. The outlet pipe 40 is connected at one end to the clear water tank 6 and at the other end to the outside of the device, allowing the filtered water to be discharged through the outlet pipe 40.

[0031] The valve assembly includes inlet and outlet valves, backwash valves, and sludge discharge valves. The inlet and outlet valves include an inlet valve 16, an outlet valve 31, an aeration pipe valve 26, and an on / off valve 39. The backwash valves include a first valve 32, a second valve 33, and a third valve 34. The sludge discharge valves include a sludge discharge valve 35, a first sludge discharge valve 36, a second sludge discharge valve 37, and a third sludge discharge valve 38.

[0032] An inclined tube 9 is installed at the upper part of the primary sedimentation tank 1. The inclined tube 9 contains multiple water pipes, and each water pipe is closely attached to each other and arranged at a 60-degree angle to the horizontal. In addition, the side wall of the inclined tube 9 is attached to the inclined baffle 10. As the water level rises, the water flows into the bottom of the inclined tube 9 and flows out from the top of the inclined tube 9. Finally, it overflows from the primary sedimentation tank 1 through the inclined baffle 10 to the primary filter tank 2. When the water flows upward through the inclined tube 9, most of the uneaten feed, feces and other suspended matter in the wastewater settles to the surface of the inclined tube 9 or directly to the bottom of the tank under the action of gravity. Then, due to gravity, it slides down the surface of the inclined tube 9 to the bottom of the primary sedimentation tank 1, and some small suspended matter enters the primary filter tank 2 with the water flow.

[0033] The microfiltration membrane module includes a first microfiltration membrane module 12 and a second microfiltration membrane module 27. The microfiltration membrane module is made of glass fiber tube, which can increase the initial flux of the microfiltration membrane module.

[0034] The first microfiltration membrane module 12 is located at the top of the primary filter tank 2. A baffle 13 is provided on the left side of the first microfiltration membrane module 12. The top of the first microfiltration membrane module 12 is connected to the inlet of the self-priming pump 15 through a suction pipe 14, and an inlet valve 16 is provided on the suction pipe 14 to control its opening and closing. At the same time, the self-priming pump 15 is connected to the bottom of the anoxic tank 3 through a self-priming pump outlet pipe 17. The baffle 13 causes the water overflowing from the primary sedimentation tank 1 to undergo secondary sedimentation after flowing into the middle of the primary filter tank 2. When the supernatant after sedimentation passes through the first microfiltration membrane module 12, suspended solids are blocked outside the first microfiltration membrane module 12, thereby removing a large amount of TP from the wastewater. The filtered wastewater then enters the bottom of the anoxic tank 3 under the suction of the self-priming pump 15.

[0035] Meanwhile, a flow promoter 21 is installed at the bottom of the partition 20 between the anoxic tank 3 and the aerobic tank 4. The flow promoter 21 faces the partition 20 directly, and an outlet 22 is provided on the partition 20 directly opposite the flow promoter 21. Furthermore, suspended packing material 18 is installed between the aerobic tank 4 and the anoxic tank 3. The suspended packing material 18 is made of lightweight ceramsite or PE multifaceted hollow spheres. Filter screens 19 with a smaller mesh size than the suspended packing material 18 are installed on the upper and lower sides of the suspended packing material 18 in both tanks, and the filter screens 19 in both tanks are fixed around the perimeter of the tanks. After the wastewater enters the bottom of the anoxic tank 3, it immediately mixes with the wastewater pushed back from the aerobic tank 4 by the flow promoter 21. Since the wastewater entering from the primary filter 2 contains organic matter, which can serve as a carbon source, while the wastewater returning from the aerobic tank 4 is rich in nitrate nitrogen and nitrite nitrogen, and since the surface of the suspended packing 18 has microorganisms, the two types of wastewater undergo denitrification in the anoxic tank 3 under the action of microorganisms to generate nitrogen gas and discharge it, thus effectively removing TN from the wastewater. After the reaction, the wastewater overflows into the aerobic tank 4 through the baffle 20. At the same time, the wastewater overflowing from the anoxic tank 3 and the original wastewater in the aerobic tank 4 undergo carbonization and nitrification reactions in the aerobic tank 4 due to the action of microorganisms on the surface of the suspended packing 18. The organic matter in them is consumed, and the ammonia nitrogen in the wastewater reacts to generate nitrate nitrogen and nitrite nitrogen. The wastewater after the reaction flows back to the anoxic tank 3 through the action of the propeller 21 at the bottom of the aerobic tank 4. Meanwhile, the water in the aerobic tank 4 overflows into the filter tank 5 through the baffle 20 between the aerobic tank 4 and the filter tank 5.

[0036] Furthermore, the second microfiltration membrane module 27 is located at the top of the filter tank 5. An aeration disc 23 is located below the second microfiltration membrane module 27, and the aeration disc 23 is connected to the blower 25 via an aeration pipe 24. An aeration pipe valve 26 is located at the connection point between the aeration pipe 24 and the blower 25. Simultaneously, the upper part of the second microfiltration membrane module 27 is connected to the inlet of the effluent pump 29 via a pipe 28. The outlet of the effluent pump 29 is connected to the clear water tank 6 via a clear water tank inlet pipe 30. An on / off valve 39 is located on the pipe 28 between the second microfiltration membrane module 27 and the effluent pump 29 to control its start and stop. An effluent valve 31 is located between the effluent pump 29 and the clear water tank inlet pipe 30 to control its start and stop. Additionally, a branch pipe branches off from the pipe 28 between the on / off valve 39 and the effluent pump 29 and connects to the clear water tank inlet pipe 30, and a first valve 32 is located on this branch pipe. The second microfiltration membrane module 27 performs secondary filtration on the water from the aerobic tank 4 to achieve the effect of separating mud and water. Then, the effluent pump 29 pumps the filtered sewage to the clear water tank 6, while the blower 25 sends air through the aeration disc 23 to the filter tank 5 to aerate the bottom of the second microfiltration membrane module 27 in the filter tank 5. The generated microbubbles can wash the surface of the membrane module and alleviate membrane fouling.

[0037] Meanwhile, an aeration disc 23 is installed at the bottom of the aerobic tank 4. The aeration disc 23 is connected to the blower 25 through an aeration pipe 24. The aeration pipe 24 connected to the aeration disc 23 in the aerobic tank 4 and the aeration pipe 24 connected to the aeration disc 23 in the filtration tank 5 are two branches of the same aeration pipe 24. By sending oxygen to the aerobic tank 4 through the aeration disc 23 by the blower 25, the dissolved oxygen content in the water is ensured, guaranteeing the chemical reactions in the aerobic tank 4.

[0038] The primary sedimentation tank 1 has a first inclined plate 8 with an inclination angle greater than 55° around its bottom perimeter, forming a sludge discharge port. The primary filter tank 2 has a second inclined plate 11 with an inclination angle greater than 55° around its bottom perimeter, also forming a sludge discharge port. Below the two sludge discharge ports, the anoxic tank 3 is connected to a sludge discharge pipe. A first sludge discharge valve 36 is installed on the sludge discharge pipe below the primary sedimentation tank 1's sludge discharge port, a second sludge discharge valve 37 is installed on the sludge discharge pipe below the primary filter tank 2's sludge discharge port, and a third sludge discharge valve 38 is installed on the sludge discharge pipe below the anoxic tank 3. The three sludge discharge pipes eventually converge to a single sludge discharge pipe, and a main control sludge discharge valve 35 is located at the outlet of the sludge discharge pipe. When the sludge in the device reaches a certain amount, the sludge discharge valves are opened to discharge sludge. Regular sludge discharge is also required to ensure smooth operation of the device.

[0039] In addition, a branch pipe is provided on the side of the self-closing valve 39 on the pipeline 28 away from the outlet pump 29. The branch pipe extends to the side of the suction pipe 14 near the first microfiltration membrane assembly 12 and is connected to the first microfiltration membrane assembly 12 through the suction pipe 14. At the same time, a third valve 34 is provided on this branch pipe. A branch pipe is provided on the clear water tank inlet pipe 30 between the outlet pump 29 and the outlet valve 31. The branch pipe extends outward and is connected to the branch pipe of the pipeline 28. At the same time, a second valve 33 is provided near the connection with the branch pipe of the pipeline 28. When the microfiltration membrane module is severely fouled, the first valve 32 and the second valve 33 are opened, and the remaining valves are closed. The clean water in the clear water tank 6 is pumped to the first microfiltration membrane module 12 by the suction of the outlet pump 29 for online backwashing to remove the sludge on the outer surface of the first microfiltration membrane module 12 and restore the membrane flux. Then, the first valve 32, the second valve 33, and the third valve 34 are opened, and the remaining valves are closed. The outlet pump 29 sends clean water to the second microfiltration membrane module 27 for online backwashing until the sludge on the outer surface of the second microfiltration membrane module 27 is removed and the membrane flux is restored.

[0040] Finally, the anoxic tank 3 and the aerobic tank 4 are biological fluidized beds, which are produced by a combination of A / O process and biofilm method in the biochemical treatment section. This process is suitable for the treatment of low-concentration wastewater, which is consistent with the characteristics of the light pollution of filtered aquaculture wastewater.

[0041] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0042] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. An integrated wastewater treatment device, characterized in that: It includes a sedimentation tank, backwashing assembly, microfiltration membrane assembly, piping assembly, inclined baffle (10), baffle (13), self-priming pump (15) and effluent pump (29); The sedimentation tank includes a primary sedimentation tank (1), a primary filter tank (2), an anoxic tank (3), an aerobic tank (4), a filter tank (5), and a clear water tank (6) connected in sequence. The primary sedimentation tank (1) and the primary filter tank (2) are separated by an inclined partition (10). An inclined tube (9) is provided at the upper part of the primary sedimentation tank (1). The inclined tube (9) is arranged at an inclination with the horizontal direction, and the side wall of the inclined tube (9) is attached to the inclined partition (10). The piping assembly includes an inclined pipe (9), a suction pipe (14), a pipe (28), a self-priming pump outlet pipe (17), and a clear water tank inlet pipe (30); The microfiltration membrane module includes a first microfiltration membrane module (12) and a second microfiltration membrane module (27). The first microfiltration membrane module (12) is located at the top of the primary filter (2) and on the right side of the baffle (13), and is connected to the self-priming pump (15) through the suction pipe (14). The second microfiltration membrane module (27) is located at the top of the filter (5) and is connected to the effluent pump (29) through the pipe (28). The self-priming pump (15) is connected to the lower part of the anoxic pool (3) through the self-priming pump outlet pipe (17), and the outlet pump (29) is connected to the clear water pool (6) through the clear water pool inlet pipe (30). The suction pipe (14) and the pipe (28) are connected in parallel. After being connected in parallel, they are connected to the clear water tank (6) through the clear water tank inlet pipe (30). A backwashing component is installed on the parallel pipe.

2. The integrated wastewater treatment device according to claim 1, characterized in that: The backwashing assembly includes a water pump (29), a first valve (32), a second valve (33), a third valve (34), and an on / off valve (39). The first valve (32) is installed on a branch pipe of the pipeline (28) that branches off from the water inlet of the water pump (29) and connects to the water inlet pipe (30) of the clear water tank. The second valve (33) is installed on a branch pipe of the pipeline (28) that connects to the water inlet pipe (30) of the clear water tank after the pipeline (28) and the suction pipe (14) are connected in parallel. A branch pipe branches off from the pipeline (28) and connects to the suction pipe (14) in parallel. The third valve (34) is installed on the branch pipe of the pipeline (28). The on / off valve (39) is installed on the pipeline (28) that connects to the water inlet of the water pump (29) and on the pipeline (28) where the branch pipe of the first valve (32) does not branch off.

3. The integrated wastewater treatment device according to claim 1, characterized in that: The bottom of the primary sedimentation tank (1) is provided with a first inclined plate (8) with an inclination angle greater than 55°, and the first inclined plate (8) on all four sides forms a sludge discharge port.

4. The integrated wastewater treatment device according to claim 1, characterized in that: The bottom of the primary filter tank (2) is provided with a second inclined plate (11) with an inclination angle greater than 55°, and the second inclined plate (11) on all four sides forms a sludge discharge port.

5. The integrated wastewater treatment device according to claim 1, characterized in that: Suspended packing material (18) is provided between the aerobic tank (4) and the anoxic tank (3). The suspended packing material (18) is lightweight ceramsite or PE multi-faceted hollow spheres.

6. The integrated wastewater treatment device according to claim 5, characterized in that: The upper and lower parts of the suspended packing material (18) are equipped with filter screens (19) with a mesh size smaller than that of the suspended packing material (18), and the filter screens (19) of the aerobic tank (4) and the anoxic tank (3) are fixed to the tank walls of the aerobic tank (4) and the anoxic tank (3) respectively.

7. The integrated wastewater treatment device according to claim 1, characterized in that: The bottom of the aerobic tank (4) is equipped with an aeration disc (23), which is connected to the blower (25) through an aeration pipe (24).

8. The integrated wastewater treatment device according to claim 7, characterized in that: An aeration disc (23) is provided below the second microfiltration membrane assembly (27) of the filter tank (5), and the aeration disc (23) is connected to the blower (25) through the aeration pipe (24).

9. The integrated wastewater treatment device according to claim 1, characterized in that: The microfiltration membrane module is made of glass fiber tubes.

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