Prefabricated sewage treatment device
By using prefabricated assembled wastewater treatment devices and employing pressurized dissolved air flotation and reflux pressurized dissolved air processes, the problems of solid-liquid separation and pollutant removal in the treatment of high-concentration organic wastewater have been solved, achieving efficient and low-energy wastewater treatment results.
Patent Information
- Application Number
- CN202422214236.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-10
- Publication Date
- 2025-10-31
- Estimated Expiration
- 2034-09-10
AI Technical Summary
Existing technologies are insufficient for efficiently treating high-concentration organic wastewater, especially livestock and poultry breeding wastewater and petrochemical discharge wastewater. Conventional wastewater treatment processes have long operating cycles and cannot effectively remove nitrogen and phosphorus, and also generate greenhouse gases.
The prefabricated wastewater treatment device uses a pressurized dissolved air flotation process and a reflux pressurized dissolved air process to decompose pollutants by microbubble flocculation and hydroxyl radical oxidation. Combined with the prefabricated steel structure design, it achieves solid-liquid separation and pollutant removal.
It achieves efficient solid-liquid separation, reduces energy consumption, is suitable for the pretreatment and advanced treatment of high-concentration organic wastewater, and improves the biodegradability of wastewater.
Smart Images
Figure CN223496319U_ABST
Abstract
Description
Technical Field
[0001] This utility model pertains to wastewater treatment equipment, specifically a prefabricated assembled wastewater treatment device. Background Technology
[0002] High-concentration organic wastewater, such as livestock and poultry breeding wastewater and petrochemical discharge wastewater, contains high levels of pollutants, with BOD, COD, and suspended solids reaching thousands or even tens of thousands. Conventional wastewater treatment processes are insufficient, requiring pretreatment to reduce pollutant levels before the water can be discharged into a wastewater treatment plant. Commonly used anaerobic wastewater treatment processes, such as the UASB process, have long start-up cycles. It typically takes 8-12 weeks for anaerobic microorganisms to reach the designed sludge concentration after inoculation, cultivation, and acclimatization. Furthermore, the UASB process cannot remove nitrogen and phosphorus, and the wastewater treatment reaction produces large amounts of greenhouse gases such as methane.
[0003] This design utilizes a prefabricated, assembled wastewater treatment device. Pollutant flocs and microbubbles generated after depressurization and release of recirculated pressurized dissolved air flotation water come into full contact and adhere, forming air-flocculated flocs with a density less than water. Under buoyancy, these flocs float to the surface, forming scum, which is then discharged into a scum discharge tank for solid-liquid separation. The generated bubbles have a particle size of approximately 20-100 μm. When these bubbles burst, they produce a large number of hydroxyl radicals, which can oxidize and decompose pollutants in the wastewater, improving the biodegradability of recalcitrant pollutants. The device employs a pressurized dissolved air flotation process with a recirculation pressurized dissolved air flow, resulting in energy savings during operation. It is particularly suitable for the pretreatment and advanced treatment of high-concentration organic wastewater from industries such as papermaking and dyeing, petrochemicals, and livestock farming. This device features a prefabricated, assembled steel structure design, a high degree of automation, and is easy to install and use. Utility Model Content
[0004] The purpose of this utility model is to solve the above problems and provide a prefabricated assembled sewage treatment device.
[0005] To achieve the above objectives, this utility model provides a prefabricated assembled sewage treatment device, including a prefabricated solid-liquid separation tank, a dosing device, a pressurized dissolved air reflux device, and a sludge storage device.
[0006] The prefabricated solid-liquid separation tank is equipped with a first partition baffle and a second partition baffle, which divide the prefabricated solid-liquid separation tank into a stirring flocculation tank, an air flotation separation tank and a water collection and drainage tank from left to right.
[0007] The stirred flocculation tank is connected to an inlet pipe and a PAC dosing pipe and a PAM dosing pipe.
[0008] Furthermore, the mixing and flocculation tank is divided into a first mixing and flocculation tank and a second mixing and flocculation tank by a middle partition baffle, and a mixer is installed in both the first mixing and flocculation tank and the second mixing and flocculation tank.
[0009] The bottom of the stirred flocculation tank is equipped with a sludge flow channel and a sludge pump;
[0010] The first partition baffle is uniformly provided with water guiding holes;
[0011] The bottom of the air flotation separator is equipped with a pressure relief release device for dissolved air water, and is connected to a pressurized dissolved air return device fixed outside the prefabricated solid-liquid separation tank via a pipeline. The pressurized dissolved air return device has a built-in pressurized pump and a pressure dissolved air tank, and is connected to the water collection and drainage tank to return filtered and treated clean water.
[0012] The upper part of the air flotation separator is equipped with two rotating shafts fixed to the upper part of the prefabricated solid-liquid separation tank. The two rotating shafts are connected by a conveyor chain, and four scraper plates are fixed on the conveyor chain. The fixed rotating shaft on the right side is connected to the rotating motor through the conveyor chain. A sludge flow channel and a sludge pump are set at the bottom right side of the air flotation separator.
[0013] The second partition baffle is provided with a slag discharge trough and a slag discharge port at the top and a filter grid at the bottom. The slag discharge port is connected to the sludge storage device through a sludge pipe.
[0014] Furthermore, a water collection trough and a drain outlet are provided at the top of the water collection and drainage tank, and a sedimentation trough and a sludge pump are provided at the bottom;
[0015] The sludge pumps at the bottom of the flotation separator and the water collection and drainage tank are connected to the sludge storage device outside the prefabricated solid-liquid separation tank via sludge pipes; the bottom of the mixing flocculation tank, the flotation separator, and the water collection and drainage tank are all equipped with drain pipes.
[0016] The prefabricated solid-liquid separation tank is externally equipped with a pressurized dissolved gas reflux device, a control cabinet, and step treads.
[0017] The beneficial effects of this utility model are as follows:
[0018] This invention relates to a prefabricated, assembled wastewater treatment device. Pollutant flocs and microbubbles generated after depressurization of recirculated pressurized dissolved air water come into full contact and adhere, forming an air flotation mass with a density less than water. Under buoyancy, this mass floats to the water surface, forming scum for solid-liquid separation. The generated bubbles have a particle size of approximately 20-100 μm. When these bubbles burst, they produce a large number of hydroxyl radicals that oxidize and decompose pollutants in the wastewater, improving the biodegradability of recalcitrant pollutants. The device employs a pressurized dissolved air flotation process with a recirculation pressurized dissolved air flow, resulting in energy savings during operation. It is particularly suitable for treating organic wastewater with high suspended solids concentrations. Attached Figure Description
[0019] Figure 1 This diagram schematically illustrates the structure of a prefabricated wastewater treatment device according to one embodiment of the present invention.
[0020] Figure 2 This is a schematic diagram of the interior of a prefabricated wastewater treatment device.
[0021] 1. Prefabricated solid-liquid separation tank body; 2. First partition baffle; 3. Second partition baffle; 4. Stirred flocculation tank; 5. Air flotation separation tank; 6. Water collection and drainage tank; 7. Inlet pipe; 8. PAC dosing pipe; 9. PAM dosing pipe; 10. Intermediate partition baffle; 11. First stirred flocculation tank; 12. Second stirred flocculation tank; 13. Mixer; 14. Dosing device; 15. Dosing tank; 16. Agitator; 17. Metering pump; 18. Guide water flow hole; 19. Pressure reducing release device 20. Pressurized dissolved air reflux device; 21. Pressurized pump; 22. Pressurized dissolved air tank; 23. Wastewater return pipe; 24. Rotating rod and shaft; 25. Conveyor chain; 26. Sludge scraper; 27. Rotary motor; 28. Sludge flow channel; 29. Sludge pump; 30. Sludge discharge channel; 31. Sludge discharge port; 32. Filter grid; 33. Sludge pipeline; 34. Sludge storage device; 35. Water collection tank; 36. Drain outlet; 37. Empty pipe; 38. Control cabinet; 39. Steps; 40. Screw cap. Detailed Implementation
[0022] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the embodiments will be briefly described 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 any creative effort.
[0023] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. The embodiments cannot be described in detail here, but the embodiments of the present invention are not limited to the following embodiments.
[0024] like Figure 1 and Figure 2As shown, this utility model provides a prefabricated assembled sewage treatment device, including a prefabricated solid-liquid separation tank 1, a dosing device 14, a pressurized dissolved air reflux device 20, and a sludge storage device 34. The prefabricated solid-liquid separation tank 1 is provided with a first partition baffle 2 and a second partition baffle 3, dividing the prefabricated solid-liquid separation tank 1 from left to right into a stirring flocculation tank 4, an air flotation separation tank 5, and a water collection and drainage tank 6. The stirring flocculation tank 4 is connected to an inlet pipe 7 and a PAC dosing pipe 8 and a PAM dosing pipe 9. The stirring flocculation tank 4 is separated by the intermediate partition baffle 10. Flocculation tank 4 is divided into a first stirred flocculation tank 11 and a second stirred flocculation tank 12. A mixer 13 is installed in both the first stirred flocculation tank 11 and the second stirred flocculation tank 12. A sludge flow channel 28 and a sludge pump 29 are installed at the bottom of the stirred flocculation tank 12. Guide water-stepping holes 18 are evenly distributed on the first partition baffle 2. A pressure-reducing release device 19 for dissolved air water is installed at the bottom of the dissolved air flotation separator 5, and is connected to a pressurized dissolved air reflux device 20 fixed to the outside of the prefabricated solid-liquid separation tank body 1 via a pipeline. The pressurized dissolved air reflux device 20 has a built-in pressurization system. Pump 21 and pressure dissolved air tank 22 are connected to the collection and drainage tank 6 via sewage return pipe 23 to return filtered treated water; two rotating rods and shafts 24 are fixed to the upper part of the prefabricated solid-liquid separation tank 1 at the upper part of the air flotation separator 5. The two rotating rods and shafts 24 are connected by a conveyor chain 25, and four scraper plates 26 are fixed on the conveyor chain 25. The fixed rotating rod and shaft 24 on the right side is connected to the rotating motor 27 via the conveyor chain 25. A sludge flow channel 28 and a sludge pump 29 are set at the bottom right side of the air flotation separator 5; the second partition baffle 3 is topped with... The upper part is equipped with a slag discharge trough 30 and a slag discharge port 31, and the lower part is equipped with a filter grid 32. The slag discharge port 31 is connected to the sludge storage device 34 through a sludge pipe 33. The upper part of the water collection and drainage tank 6 is equipped with a water collection trough 35 and a drain outlet 36, and the bottom is equipped with a sludge flow trough 28 and a sludge pump 29. The filter grid 32 filters the wastewater after air flotation separation. Larger flocs sink into the sludge flow troughs 28 on both sides of the bottom of the tank and are discharged into the sludge storage device 34 by the sludge pump 29. The filtered wastewater enters the water collection trough 35 of the water collection and drainage tank 6 and is discharged out of the tank through the drain outlet 36.
[0025] The sludge pump 29 at the bottom of the flotation separator 5 and the water collection and drainage tank 6 is connected to the sludge storage device 34 outside the prefabricated solid-liquid separation tank 1 through the sludge pipe 33; the bottom of the stirring flocculation tank 4, the flotation separator 5 and the water collection and drainage tank 6 are all equipped with drain pipes 37; the prefabricated solid-liquid separation tank 1 is fixed with a pressurized dissolved air reflux device 20, a control cabinet 38 and step 39.
[0026] According to one embodiment of this utility model, the prefabricated solid-liquid separation tank body 1 is a prefabricated steel structure made of carbon steel, with anti-corrosion coating applied to both sides of the tank body. The dosing device 14 and the sludge storage device 34 are both prefabricated assembled structures, offering advantages such as corrosion resistance and convenient installation. The dosing device 14 includes a dosing tank 15, a stirrer 16, and a metering pump 17.
[0027] The pressurized dissolved air reflux device 20 of this utility model is installed outside the prefabricated solid-liquid separation tank 1, and is connected to the bottom reflux pressure relief release device 19 of the air flotation separator 5 and the water collection and drainage tank 6 through a pipeline. The pressurized dissolved air reflux device 20 has a built-in pressurized pump 21 and a pressure dissolved air tank 22. The reflux dissolved air water volume should be adjustable according to the influent volume. The bottom pipeline of the prefabricated solid-liquid separation tank 1 is made of corrosion-resistant seamless steel pipe, and the end is equipped with a pressure relief release device 19 for dissolved air water.
[0028] The first partition baffle 2 of this utility model has a guide flow hole 18. The sewage entering the tank, together with the PAC dosing pipe 8 and the PAM dosing pipe 9, enters the reagent and is mixed by the mixer 13 in the stirring flocculation tank 4. Then, it enters the air flotation separation tank 5 evenly through the guide flow hole 18.
[0029] The slag scraping system of this utility model includes a rotating shaft 24, a conveyor chain 25, a slag scraper 26, and a rotating motor 27, which is connected to a control cabinet 38 to control the slag scraping system to scrape off floating foam.
[0030] The control cabinet 38 of this utility model is installed outside the prefabricated solid-liquid separation tank 1 to automatically control the dosing process of the stirring flocculation tank 4, the operation of the stirring and flocculation process of the mixer 13, the operation of the rotating motor 27 of the sludge scraping system, and the sludge discharge process of the sludge pump 29.
[0031] The bottom of the prefabricated solid-liquid separation tank 1 of this utility model is equipped with a drain pipe 37, and a spiral cover 40 is designed on the outside of the drain pipe 37 to facilitate drainage and maintenance during shutdown. The exterior of the prefabricated solid-liquid separation tank 1 is designed with steps 39 to facilitate equipment debugging and operation process control.
[0032] The working process of this utility model is as follows: First, sewage enters the stirred flocculation tank 4 through the inlet pipe on the left side of the prefabricated solid-liquid separation tank 1. The pollutants in the water and the PAC and PAM agents entering the stirred flocculation tank 4 are mixed under the agitation of the mixer 13 to form flocs. Then, the mixture enters the air flotation separation tank 5. The pressurized dissolved air reflux device 20 aerates the mixed sewage entering the air flotation separation tank 5. The generated micro-nano bubbles adhere to the periphery of the flocs. Under the buoyancy of the water, the flocs float to the surface of the water flow in the air flotation separation tank 5. Under the push of the scraper above the air flotation separation tank 5, they are discharged into the sludge discharge trough and finally into the sludge storage device 34, realizing solid-liquid separation. When the micro-nano bubbles generated by the pressurized dissolved air reflux device 20 break in the water, they generate a large number of hydroxyl radicals, which can oxidize and decompose the recalcitrant pollutants in the water and improve the biodegradability of the sewage. After the air flotation separation, the wastewater is screened by the filter screen 32 and enters the water collection and drainage tank 6. It is discharged out of the tank through the water collection trough 35 and the drain outlet 36 and enters the next wastewater treatment process. The sludge settled on both sides of the filter screen 32 is pumped into the sludge storage device 34 by the sludge pump 29.
[0033] The above description is merely one embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A prefabricated assembled sewage treatment device, comprising a prefabricated solid-liquid separation tank (1), characterized in that, The prefabricated solid-liquid separation tank (1) is provided with a first partition baffle (2) and a second partition baffle (3) to divide the prefabricated solid-liquid separation tank (1) into a stirring flocculation tank (4), an air flotation separation tank (5) and a water collection and drainage tank (6). The stirred flocculation tank (4) is connected to two inlet pipes (7) and PAC dosing pipes (8) and PAM dosing pipes (9). The stirred flocculation tank (4) is divided into a first stirred flocculation tank (11) and a second stirred flocculation tank (12) by a middle partition baffle (10). A mixer (13) is installed in both the first stirred flocculation tank (11) and the second stirred flocculation tank (12). The PAC dosing pipe (8) and PAM dosing pipe (9) are respectively connected to the dosing device (14), which includes a dosing tank (15), a stirrer (16) and a metering pump (17). The first partition baffle (2) is uniformly provided with water guiding holes (18); The air flotation separator (5) is equipped with a pressure relief release device (19) for dissolved air water at the bottom, and is connected to a pressurized dissolved air return device (20) fixed outside the prefabricated solid-liquid separation tank (1) via a pipeline. The pressurized dissolved air return device (20) has a built-in pressurized pump (21) and a pressure dissolved air tank (22), and is connected to the water collection and drainage tank (6) via a sewage return pipe (23) to return filtered treated water. The air flotation separator (5) is equipped with two rotating rods (24) fixed to the upper part of the prefabricated solid-liquid separation tank. The two rotating rods (24) are connected by a conveyor chain (25), and four scraper plates (26) are fixed on the conveyor chain (25). The fixed rotating rod (24) on the right side is connected to a rotating motor (27) via the conveyor chain (25). The bottom right side of the air flotation separator (5) is equipped with a sludge flow channel (28) and a sludge pump (29). The second partition baffle (3) is provided with a slag discharge trough (30) and a slag discharge port (31) at the top and a filter grid (32) at the bottom. The slag discharge port (31) is connected to the sludge storage device (34) through a sludge pipe (33). The upper part of the water collection and drainage pool is provided with a water collection trough (35) and a drain outlet (36), and the bottom is provided with a sedimentation trough (28) and a sludge pump (29). The sludge pumps (29) at the bottom of the stirred flocculation tank (4), the air flotation separation tank (5) and the water collection and drainage tank (6) are connected to the sludge storage device (34) outside the prefabricated solid-liquid separation tank through sludge pipes (33); the bottom of the stirred flocculation tank (4), the air flotation separation tank (5) and the water collection and drainage tank (6) are all equipped with drain pipes (37); the prefabricated solid-liquid separation tank body (1) is fixed with a pressurized dissolved air return device (20), a control cabinet (38) and step steps (39).
2. The prefabricated assembled sewage treatment device according to claim 1, characterized in that, The prefabricated solid-liquid separation tank body (1) is a prefabricated steel structure made of carbon steel. The two sides of the tank body are coated with anti-corrosion paint. The dosing device (14) and the sludge storage device (34) are both prefabricated assembled structures.
3. The prefabricated assembled sewage treatment device according to claim 1, characterized in that, The pressurized dissolved air reflux device (20) is installed outside the prefabricated solid-liquid separation tank (1). It is connected to the depressurization release device (19) at the bottom of the air flotation separation tank (5) and the water collection and drainage tank (6) through the sewage return pipe (23). The pressurized dissolved air reflux device (20) has a built-in pressurization pump (21) and a pressure dissolved air tank (22). The amount of refluxed dissolved air water should be adjustable according to the amount of influent. The refluxed filtered water is pressurized. The bottom pipe of the prefabricated solid-liquid separation tank (1) is made of corrosion-resistant seamless steel pipe. The end is equipped with a depressurization release device (19) for dissolved air water. After depressurization and release, the generated bubbles are small bubbles with a particle size of about 20-100μm.
4. The prefabricated assembled sewage treatment device according to claim 1, characterized in that, The first partition baffle (2) has a water distribution hole (18).
5. The prefabricated assembled sewage treatment device according to claim 1, characterized in that, The prefabricated concrete flotation solid-liquid separation device is designed with a slag scraping system including a rotating motor (27), a slag scraper (26), a conveyor chain (25), and a rotating shaft (24). It is connected to the control cabinet (38) for opening, closing, and speed control. The rotating motor (27) drives the slag scraping system to scrape off floating foam.
6. The prefabricated assembled sewage treatment device according to claim 1, characterized in that, The prefabricated assembled coagulation flotation solid-liquid separation device is equipped with a control cabinet (38) installed outside the prefabricated solid-liquid separation tank (1) to automatically control the dosing process of the stirring flocculation tank (4), the flocculation stirring process of the mixer (13), the operation process of the rotating motor (27) of the sludge scraping system, and the sludge discharge process of the sludge pump (29).
7. The prefabricated assembled sewage treatment device according to claim 1, characterized in that, The bottom of the prefabricated solid-liquid separation tank (1) is equipped with a drain pipe (37), and a spiral cover (40) is designed on the outside of the drain pipe (37) to facilitate drainage and maintenance during shutdown. The exterior of the prefabricated solid-liquid separation tank (1) is designed with steps (39) to facilitate equipment debugging and operation process control.