A device and method for combined removal of heavy metals and antibiotics from wastewater

Abstract

This invention relates to the field of wastewater treatment and discloses a device and method for the combined removal of heavy metals and antibiotics from wastewater. The device includes: a coagulation reaction zone, a pre-sedimentation tank, a high-efficiency sedimentation tank, an ozone distribution zone, an ozone oxidation tank, a primary anoxic tank, a primary aerobic tank, a secondary anoxic tank, a secondary aerobic tank, and a disinfection tank. The coagulation reaction zone is symmetrically and fixedly connected to one side of the pre-sedimentation tank, and the high-efficiency sedimentation tank is fixedly connected to the other side of the pre-sedimentation tank. This invention achieves rapid and efficient sedimentation of coagulated flocs through the combination of vertical and horizontal flow high-efficiency sedimentation tanks, removing heavy metals from wastewater in the form of precipitates. Furthermore, the advanced ozone oxidation process removes antibiotics, improves the biodegradability of the wastewater, and simultaneously disinfects the effluent, saving investment. In addition, the efficient solid-liquid separation of flat sheet membrane modules replaces the secondary sedimentation tank, effectively ensuring that the effluent is clear and meets standards.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment, specifically to a device and method for the combined removal of heavy metals and antibiotics from wastewater. Background Technology

[0002] Agricultural non-point source pollution is a significant cause of eutrophication in water bodies, and livestock and poultry breeding wastewater is one of the most important sources of agricultural non-point source pollution. The conflict between the development of livestock and poultry farming and environmental protection is becoming increasingly prominent. With population growth and improved living standards, the demand for livestock and poultry products is increasing; moreover, livestock and poultry breeding wastewater is a typical example of high-concentration agricultural wastewater, characterized by high levels of organic matter, nitrogen and phosphorus, heavy metals, and antibiotics.

[0003] Therefore, before discharging livestock and poultry breeding wastewater, it is necessary to use wastewater treatment equipment to treat the wastewater before discharge. However, the existing livestock and poultry breeding wastewater treatment equipment has a complicated treatment process and complex structure. At the same time, when removing heavy metals from the wastewater, it is not possible to improve the sedimentation efficiency by simply transporting the wastewater to the sedimentation tank for natural settling. In addition, when treating antibiotic organic matter, chlorine and chlorine dioxide are usually used for reaction and removal, resulting in high treatment costs and low efficiency. Furthermore, it is not possible to discharge the sediment inside the sedimentation tank at the same time. Summary of the Invention

[0004] The purpose of this invention is to provide a device and method for the combined removal of heavy metals and antibiotics from wastewater, and to solve the following technical problems: how to improve the efficiency of livestock and poultry breeding wastewater treatment devices in removing heavy metals and antibiotic organic matter, and reduce the cost of wastewater treatment.

[0005] The objective of this invention can be achieved through the following technical solution: a wastewater heavy metal and antibiotic combined removal device, comprising: a coagulation reaction zone, a pre-sedimentation tank, a high-efficiency sedimentation tank, an ozone distribution zone, an ozone oxidation tank, a primary anoxic tank, a primary aerobic tank, a secondary anoxic tank, a secondary aerobic tank, and a disinfection tank, wherein the coagulation reaction zone is symmetrically and fixedly connected to one side of the pre-sedimentation tank, and the high-efficiency sedimentation tank is fixedly connected to the other side of the pre-sedimentation tank;

[0006] The ozone distribution zone is fixedly connected to one side of the high-efficiency sedimentation tank, the ozone oxidation tank is fixedly connected to one side of the ozone distribution zone, the primary anoxic tank is fixedly connected to one end of the ozone oxidation tank, the primary aerobic tank is fixedly connected to one side of the primary anoxic tank, the secondary anoxic tank is fixedly connected to one side of the primary aerobic tank, the secondary aerobic tank is fixedly connected to one side of the secondary anoxic tank, and the disinfection tank is fixedly connected to one side of the secondary aerobic tank.

[0007] A dosing tank is uniformly and fixedly connected to the outer surface of the coagulation reaction zone. A mixer is fixedly installed inside both the coagulation reaction zone and the dosing tank. A dosing pump is fixedly installed inside the dosing tank.

[0008] The ozone oxidation tank is uniformly equipped with ozone baffles. An aeration system is fixedly installed at the bottom of the ozone distribution zone and the primary aerobic tank. Flat sheet membrane modules are symmetrically fixedly installed at the bottom of the secondary aerobic tank. An inlet is provided at one end of the coagulation reaction zone. An outlet is provided at the center of the side of the disinfection tank. An ozone pipe connects the ozone distribution zone and the disinfection tank. An ozone generator is provided in the middle of the ozone pipe between the ozone distribution zone and the disinfection tank. A cleaning component is provided inside the pre-sedimentation tank and the high-efficiency sedimentation tank.

[0009] As a preferred embodiment of the present invention: the pre-sedimentation tank is provided with a sedimentation tank inside, a stress-relief square tube is provided on one side of the sedimentation tank, a partition plate is provided in the center of the stress-relief square tube, an overflow port is provided on the outer surface of the middle part of the stress-relief square tube, an overflow baffle is provided on the outer surface of the stress-relief square tube and at the outer edge of the overflow port, and a water injection head is fixedly installed on the top edge of the stress-relief square tube.

[0010] As a preferred embodiment of the present invention: the high-efficiency sedimentation tank includes a limiting cylinder, a sludge discharge pipe, and a sludge sedimentation zone. The limiting cylinder is fixedly installed at the bottom center of the sludge sedimentation zone. The sludge discharge pipe is welded to the bottom center of the limiting cylinder. A limiting sleeve is symmetrically welded to the outer surface of one end of the limiting cylinder. A central guide cylinder is fixedly installed at the inner center of the sludge sedimentation zone. An inlet pipe is fixedly connected to the upper outer surface of the central guide cylinder. A triangular overflow weir is symmetrically fixedly installed at the top of the sludge sedimentation zone.

[0011] As a preferred embodiment of the present invention: the cleaning component includes a sludge discharge shaft, a second chain and a drive shaft, the two ends of the second chain are respectively meshed and connected to the outer surfaces of one end of the sludge discharge shaft and the drive shaft, a drive water wheel is fixedly installed on the middle outer surface of the drive shaft, and a sludge discharge roller is fixedly installed on the middle outer surface of the sludge discharge shaft, and a sludge scraping groove is formed on the outer surface of the sludge discharge roller.

[0012] A second sprocket is fixedly installed on the outer surfaces of both ends of the sludge discharge shaft and the drive shaft. A first sprocket is fixedly installed on the outer surface of one end of the sludge discharge shaft. A first chain is meshed with the outer surface of the first sprocket. A drive shaft is rotatably connected to the inner surfaces of both ends of the first chain. A cleaning shaft is meshed with one end of the drive shaft. A cleaning wire is fixedly installed on the outer surface of the middle part of the cleaning shaft.

[0013] As a preferred embodiment of the present invention: one end of the inlet pipe is inserted into the upper end of the pre-sedimentation tank, a reflector plate is provided at the bottom end of the central guide tube, an inclined tube is laid inside the sludge sedimentation zone, first limiting holes are opened on both sides of the upper part of the stilling square tube, and the drive water wheel is rotated and locked inside the stilling square tube through the first limiting holes in the middle of the drive shaft.

[0014] As a preferred embodiment of the present invention: the mud discharge roller is rotatably engaged with the inner center of the limiting cylinder via the mud discharge shaft, the transmission shaft is rotatably engaged with the outer surface of the limiting cylinder via the limiting sleeve, a second limiting hole is provided on the middle outer surface of the mud discharge pipe, and the cleaning shaft is rotatably engaged with the inside of the mud discharge pipe via the second limiting hole.

[0015] As a preferred embodiment of the present invention: the cleaning filament is in movable contact with the outer surface of the sludge discharge roller inside the sludge discharge pipe, the driving water wheel is aligned with the bottom of the water injection head at the top of the energy dissipation square tube, and the outer surfaces of both ends of the cleaning shaft are arranged in the same direction.

[0016] A method for combined removal of heavy metals and antibiotics from wastewater includes:

[0017] Step 1: Collect livestock and poultry breeding wastewater into the coagulation reaction zone for coagulation. The mixture after coagulation reaction is then transported into the pre-sedimentation tank for pre-sedimentation and to reduce hydraulic kinetic energy.

[0018] Step 2: The supernatant is then transported into the interior of the high-efficiency sedimentation tank to remove heavy metals through sedimentation. The supernatant filtered through the inclined tubes inside the high-efficiency sedimentation tank flows into the collection tank through the triangular overflow weir and then flows to the next process.

[0019] Step 3: The water flows sequentially into the ozone distribution area, ozone oxidation tank, primary anoxic tank, primary aerobic tank and secondary anoxic tank through the collection tank to carry out oxidation and nitrification reactions, degrading antibiotics and recalcitrant organic matter.

[0020] Step 4: Then, the sludge and water are separated by the efficient solid-liquid separation of the flat sheet membrane module. Finally, the clean water enters the disinfection tank, and the activated sludge is periodically discharged into the sludge tank. The disinfection tank uses ozone generated by an ozone generator to disinfect the sludge before it meets the discharge standards.

[0021] The beneficial effects of this invention are:

[0022] (1) This invention combines high-efficiency coagulation with high-efficiency sedimentation tank, and sets up a pre-sedimentation zone before high-efficiency sedimentation to avoid the impact of water flow on sedimentation effect. It optimizes the combination of vertical flow sedimentation tank and inclined tube, and fully combines the advantages of vertical flow and horizontal flow sedimentation tank to achieve rapid and efficient sedimentation of coagulated flocs and remove heavy metals in wastewater in the form of precipitates.

[0023] (2) This invention uses ozone generators to oxidize recalcitrant organic matter and antibiotics in wastewater into easily degradable small-molecule organic matter through ozone oxidation technology in ozone oxidation tanks and disinfection tanks. This achieves efficient removal of antibiotics and greatly improves the biodegradability of wastewater. The chemical oxygen demand (COD) can generally be reduced by 50-70%. Ozone is also a broad-spectrum and fast-acting bactericide, which has a better killing effect than chlorine on various pathogens and resistant spores and viruses. After ozone disinfection, the physical and chemical properties of water, such as turbidity and color, are significantly improved. Ozone oxidation treatment can also remove carcinogens such as benzo(a)pyrene. Ozone is used in advanced oxidation processes to remove antibiotics and improve the biodegradability of wastewater, and is also used for effluent disinfection, saving investment.

[0024] (3) This invention overcomes the limitation of denitrification efficiency by using a dual-stage A / O coupled MBR combined biological denitrification process inside the secondary aerobic tank, thereby increasing the degradation ratio of organic matter with nitrate as an electron acceptor, optimizing carbon source distribution, and reducing the competition for dissolved oxygen between heterotrophic bacteria and nitrifying bacteria. At the same time, by strengthening the gradient change of organic matter concentration and aeration intensity between the two stages of A / O, a reaction environment conducive to efficient denitrification processes such as anaerobic ammonia oxidation, short-cut nitrification and denitrification is created, improving the denitrification efficiency under low C / N ratio and effectively reducing the energy consumption of process operation. The efficient solid-liquid separation of the MBR membrane is used to achieve mud-water separation, replacing the secondary sedimentation tank, and effectively ensuring that the effluent is clear and meets the standards. Attached Figure Description

[0025] The invention will now be further described with reference to the accompanying drawings.

[0026] Figure 1 This is a cross-sectional view of the removal device;

[0027] Figure 2 This is a plan view of the removal device;

[0028] Figure 3 This is a schematic diagram of the connection structure between the pre-sedimentation tank and the high-efficiency sedimentation tank;

[0029] Figure 4 This is a schematic diagram of the cross-sectional structure of the pre-sedimentation tank;

[0030] Figure 5 This is a schematic diagram of a high-efficiency sedimentation tank.

[0031] Figure 6 This is a schematic diagram of the cleaning component structure.

[0032] Attached diagram descriptions: 1. Inlet; 2. Mixer; 3. Pre-sedimentation tank; 4. High-efficiency sedimentation tank; 5. Ozone distribution zone; 6. Ozone baffle; 7. Ozone oxidation tank; 8. Primary anoxic tank; 9. Primary aerobic tank; 10. Aeration system; 11. Secondary anoxic tank; 12. Flat sheet membrane module; 13. Secondary aerobic tank; 14. Disinfection tank; 15. Outlet; 16. Ozone generator; 17. Coagulation reaction zone; 19. Dosing pump; 20. Dosing tank; 21. Ozone pipeline; 23. Cleaning components; 31. Overflow outlet; 32. Overflow baffle; 3 3. Sedimentation tank; 34. Energy dissipation square tube; 35. Divider plate; 36. Water injection head; 41. Limiting cylinder; 42. Limiting sleeve; 43. Sludge discharge pipe; 44. Sludge sedimentation zone; 45. Central guide cylinder; 46. Triangular overflow weir; 47. Water inlet pipe; 231. Cleaning shaft; 232. First chain; 233. First sprocket; 234. Drive shaft; 235. Sludge scraper trough; 236. Cleaning filament; 237. Sludge discharge roller; 238. Sludge discharge shaft; 239. Second chain; 240. Second sprocket; 241. Drive shaft; 242. Drive impeller. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Please see Figures 1-6 As shown, the present invention is a wastewater heavy metal and antibiotic combined removal device, comprising: a coagulation reaction zone 17, a pre-sedimentation tank 3, a high-efficiency sedimentation tank 4, an ozone distribution zone 5, an ozone oxidation tank 7, a primary anoxic tank 8, a primary aerobic tank 9, a secondary anoxic tank 11, a secondary aerobic tank 13, and a disinfection tank 14. The coagulation reaction zone 17 is symmetrically and fixedly connected to one side of the pre-sedimentation tank 3, and the high-efficiency sedimentation tank 4 is fixedly connected to the other side of the pre-sedimentation tank 3.

[0035] Ozone distribution zone 5 is fixedly connected to one side of high-efficiency sedimentation tank 4, ozone oxidation tank 7 is fixedly connected to one side of ozone distribution zone 5, primary anoxic tank 8 is fixedly connected to one end of ozone oxidation tank 7, primary aerobic tank 9 is fixedly connected to one side of primary anoxic tank 8, secondary anoxic tank 11 is fixedly connected to one side of primary aerobic tank 9, secondary aerobic tank 13 is fixedly connected to one side of secondary anoxic tank 11, and disinfection tank 14 is fixedly connected to one side of secondary aerobic tank 13.

[0036] A dosing tank 20 is uniformly and fixedly connected to the outer surface of the coagulation reaction zone 17. A mixer 2 is fixedly installed inside both the coagulation reaction zone 17 and the dosing tank 20. A dosing pump 19 is fixedly installed inside the dosing tank 20.

[0037] Ozone partitions 6 are evenly arranged inside the ozone oxidation tank 7. Aeration systems 10 are fixedly installed at the bottom of the ozone distribution zone 5 and the primary aerobic tank 9. Flat sheet membrane modules 12 are symmetrically fixedly installed at the bottom of the secondary aerobic tank 13. An inlet 1 is provided at one end of the coagulation reaction zone 17. An outlet 15 is provided at the center of the side of the disinfection tank 14. An ozone pipe 21 is connected between the ozone distribution zone 5 and the disinfection tank 14. An ozone generator 16 is provided in the middle of the ozone pipe 21 between the ozone distribution zone 5 and the disinfection tank 14. A cleaning component 23 is provided inside the pre-sedimentation tank 3 and the high-efficiency sedimentation tank 4.

[0038] The pre-sedimentation tank 3 has a sedimentation tank 33 inside. A stress-relief square tube 34 is provided on one side of the sedimentation tank 33. A partition plate 35 is provided in the center of the stress-relief square tube 34. An overflow port 31 is provided on the outer surface of the middle part of the stress-relief square tube 34. An overflow baffle 32 is provided on the outer surface of the stress-relief square tube 34 and at the outer edge of the overflow port 31. A water injection head 36 is fixedly installed on the top edge of the stress-relief square tube 34.

[0039] The high-efficiency sedimentation tank 4 includes a limiting cylinder 41, a sludge discharge pipe 43, and a sludge sedimentation zone 44. The limiting cylinder 41 is fixedly installed at the bottom center of the sludge sedimentation zone 44. The sludge discharge pipe 43 is welded to the bottom center of the limiting cylinder 41. A limiting sleeve 42 is symmetrically welded to the outer surface of one end of the limiting cylinder 41. A central guide cylinder 45 is fixedly installed in the center of the sludge sedimentation zone 44. An inlet pipe 47 is fixedly connected to the upper outer surface of the central guide cylinder 45. A triangular overflow weir 46 is symmetrically fixedly installed at the top of the sludge sedimentation zone 44.

[0040] The cleaning component 23 includes a sludge discharge shaft 238, a second chain 239, and a drive shaft 241. The two ends of the second chain 239 are respectively meshed and connected to the outer surfaces of one end of the sludge discharge shaft 238 and the drive shaft 241. A drive water wheel 242 is fixedly installed on the outer surface of the middle part of the drive shaft 241. A sludge discharge roller 237 is fixedly installed on the outer surface of the middle part of the sludge discharge shaft 238. Sludge scraping grooves 235 are opened on the outer surface of the sludge discharge roller 237.

[0041] A second sprocket 240 is fixedly installed on the outer surfaces of both ends of the mud discharge shaft 238 and the drive shaft 241. A first sprocket 233 is fixedly installed on the outer surface of one end of the mud discharge shaft 238. A first chain 232 is meshed with the outer surface of the first sprocket 233. A drive shaft 234 is rotatably connected to the inner surfaces of both ends of the first chain 232. A cleaning shaft 231 is meshed with one end of the drive shaft 234. A 243 is fixedly installed on the ends of both the drive shaft 234 and the cleaning shaft 231. A cleaning wire 236 is fixedly installed on the outer surface of the middle part of the cleaning shaft 231.

[0042] One end of the inlet pipe 47 is inserted into the upper end of the pre-sedimentation tank 3. A reflector plate is installed at the bottom of the central guide tube 45. An inclined tube is laid inside the sludge sedimentation zone 44. The upper two sides of the stilling square tube 34 are provided with first limiting holes. The drive water wheel 242 is rotated and locked inside the stilling square tube 34 through the first limiting holes in the middle of the drive shaft 241.

[0043] Through the above technical solution, one end of the inlet pipe 47 can be inserted into the upper end of the pre-sedimentation tank 3, which facilitates the transport of the supernatant inside the pre-sedimentation tank 3 to the sludge sedimentation zone 44. A reflector plate is set at the bottom of the central guide tube 45, which can block the water flowing down the central guide tube 45, so that the sewage splashes on both sides. Inclined pipes are laid inside the sludge sedimentation zone 44, which can accelerate the sedimentation of the sediment. The upper two sides of the stilling square tube 34 are opened with first limiting holes, so that the drive water wheel 242 is rotated and locked inside the stilling square tube 34 through the first limiting holes in the middle of the drive shaft 241, which can limit the rotation of the drive shaft 241.

[0044] The mud discharge roller 237 is rotatably engaged with the center of the limiting cylinder 41 via the mud discharge shaft 238, and the drive shaft 234 is rotatably engaged with the outer surface of the limiting cylinder 41 via the limiting sleeve 42. A second limiting hole is provided on the outer surface of the middle part of the mud discharge pipe 43, and the cleaning shaft 231 is rotatably engaged with the inside of the mud discharge pipe 43 via the second limiting hole.

[0045] Through the above technical solution, the mud discharge roller 237 can be rotatably engaged with the inner center of the limiting cylinder 41 through the mud discharge shaft 238, which can limit the rotation of the mud discharge roller 237. The drive shaft 234 is rotatably engaged with the outer surface of the limiting cylinder 41 through the limiting sleeve 42, which can limit the rotation of the drive shaft 234. A second limiting hole is opened on the outer surface of the middle part of the mud discharge pipe 43, which allows the cleaning shaft 231 to be rotatably engaged with the inside of the mud discharge pipe 43 through the second limiting hole, thereby ensuring that the cleaning wire 236 rotates stably inside the mud discharge pipe 43.

[0046] The cleaning filament 236 is connected to the outer surface of the sludge discharge roller 237 inside the sludge discharge pipe 43. The drive water wheel 242 is aligned with the bottom of the water injection head 36 at the top of the energy dissipation square tube 34. The outer surfaces 243 of both ends of the cleaning shaft 231 are set in the same direction.

[0047] Through the above technical solution, the cleaning wire 236 is connected to the outer surface of the sludge discharge roller 237 inside the sludge discharge pipe 43. When the cleaning wire 236 rotates, it can clean the sediment inside the sludge scraping trough 235, ensuring that the sludge discharge roller 237 circulates and discharges the sediment inside the sludge sedimentation zone 44. The drive water wheel 242 is aligned with the bottom of the water injection head 36 at the top of the pressure-reducing square tube 34, ensuring that the water sprayed from the water injection head 36 impacts the upper side of the drive water wheel 242, ensuring that the drive water wheel 242 receives the impact and rotates. The outer surfaces 243 of both ends of the cleaning shaft 231 are set in the same direction, which facilitates the two sets of drive shafts 234 to drive the cleaning shaft 231 to rotate synchronously.

[0048] A method for combined removal of heavy metals and antibiotics from wastewater includes:

[0049] Step 1: Collect livestock and poultry breeding wastewater into coagulation reaction zone 17 for coagulation. The mixture after coagulation reaction is transported into pre-sedimentation tank 3 for pre-sedimentation and to reduce hydraulic kinetic energy.

[0050] Step 2: The supernatant is then transported into the interior of the high-efficiency sedimentation tank 4 to remove heavy metals through sedimentation. The supernatant filtered by the inclined tube inside the high-efficiency sedimentation tank 4 flows into the water collection tank through the triangular overflow weir 46 and flows to the next process.

[0051] Step 3: The water flows sequentially into the ozone distribution area 5, ozone oxidation tank 7, primary anoxic tank 8, primary aerobic tank 9 and secondary anoxic tank 11 through the collection tank to carry out oxidation and nitrification reactions, degrading antibiotics and recalcitrant organic matter.

[0052] Step 4: Then, the mud and water are separated by the efficient solid-liquid separation of the flat sheet membrane module 12. Finally, the clean water enters the disinfection tank 14, and the activated sludge is periodically discharged to the sludge tank. The disinfection tank 14 uses ozone generated by the ozone generator 16 to disinfect the sludge and then discharge it after it meets the standards.

[0053] The working principle of this invention is as follows: When livestock and poultry breeding wastewater needs to be treated, the wastewater is first collected and transported to three sets of dosing tanks 20. Then, PAC agent, NaOH solution to adjust the pH to 9, and PAM agent are added to the dosing tanks 20 respectively. The mixer 2 is then controlled to stir the wastewater to carry out a full coagulation reaction. The mixture after coagulation reaction is transported into the pre-sedimentation tank 3 through the water injection head 36 for pre-sedimentation. The wastewater will be blocked when entering the stilling pipe 34, and the liquid level will rise inside the stilling pipe 34 and overflow outward through the overflow port 31. When the wastewater flows over the upper surface of the overflow baffle 32, the overflow baffle 32 can impede the wastewater layer by layer, blocking the kinetic energy of the water flow and thus reducing the hydraulic kinetic energy. Then the wastewater will pre-sediment inside the sedimentation tank 33, while preventing newly injected wastewater from disturbing the sedimentation state inside the sedimentation tank 33. Therefore, after the initial sedimentation and reduction of hydraulic kinetic energy, the wastewater will descend into the sludge sedimentation zone 44 through the inlet pipe 47 and the central guide cylinder 45, entering the bottom of the high-efficiency sedimentation tank 4. The wastewater will impact the reflector plate at the bottom of the central guide cylinder 45, causing the wastewater to backflow. At the same time, the wastewater will flow along the sludge sedimentation zone 44. During the upward flow of the inclined tube, the wastewater encounters the packing material of the upper inclined tube, causing impurities and sludge particles to slide down the inclined tube under gravity to the bottom center of the sludge sedimentation zone 44, resulting in the precipitation of heavy metals and thus removing heavy metals from the wastewater. When the supernatant level in the high-efficiency sedimentation tank 4 rises, it enters the triangular overflow weir 46 and is transported to the ozone distribution zone 5 through the collection trough. At the same time, the ozone generator 16 supplies ozone into the ozone distribution zone 5, ensuring sufficient contact between the wastewater and ozone. Subsequently, under the upper and lower partitions of the ozone baffle 6, the wastewater and ozone are further separated. Further oxidation reactions are carried out to degrade antibiotics and recalcitrant organic matter. After oxidation in ozone oxidation tank 7, the wastewater is transported to the first-stage anoxic tank 8, where dissolved oxygen (DO) is controlled within the range of 0.2-0.5 mg / L for denitrification to remove organic matter. The nitrified wastewater is then transported to the first-stage aerobic tank 9, where the aeration system 10 controls dissolved oxygen (DO) above 2 mg / L for another nitrification reaction to remove ammonia nitrogen. The ammonia nitrogen-removed wastewater is then transported to the second-stage anoxic tank 11, where dissolved oxygen (DO) is controlled within the range of 0.2-0.5 mg / L.Within a concentration range of 5 mg / L, further denitrification is carried out to remove organic matter. The treated wastewater is then transported to the secondary aerobic tank 13, where dissolved oxygen (DO) is controlled above 2 mg / L for further nitrification to remove ammonia nitrogen. Simultaneously, the flat-sheet membrane module 12 inside the secondary aerobic tank 13 efficiently separates the solid and liquid components of the treated wastewater. The separated clean water is then transported to the disinfection tank 14, while the activated sludge inside the secondary aerobic tank 13 is periodically discharged to the sludge tank. Finally, the ozone generator 16 is controlled to supply ozone into the disinfection tank 14 to disinfect the incoming clean water. After disinfection, the water can be discharged once it meets the standards. When the wastewater is sprayed into the stilling pipe 34 through the water injection head 36, it impacts the drive water wheel 242 at the top of the stilling pipe 34, causing the drive water wheel 242 to rotate continuously. When the drive water wheel 242 rotates, it drives the sludge discharge shaft 238 to rotate synchronously through the second chains 239 at both ends. At the same time, the sludge discharge shaft 238 rotates, which in turn drives the sludge discharge roller 237 in the middle to rotate at the bottom center of the sludge settling zone 44. When the sludge discharge roller 237 rotates, it scrapes away the sludge in the sludge settling zone 44 through the sludge scraping groove 235 on its outer surface. The sediment settles and, following the rotation of the sludge discharge roller 237, enters the interior of the sludge discharge pipe 43. Under the influence of gravity, the sediment detaches from the interior of the scraper trough 235. Simultaneously, the sludge discharge shaft 238 drives two sets of transmission shafts 234 to rotate synchronously and in the same direction via the first sprocket 233 on one end of its outer surface. This causes one end of the transmission shaft 234 to drive the cleaning shaft 231 to rotate synchronously. Therefore, when the cleaning shaft 231 rotates, it cleans the inner surface of the scraper trough 235 through the cleaning filaments 236 in the middle, thereby accelerating the detachment of sediment from the interior of the scraper trough 235. Therefore, the sludge discharge roller 237... Under uniform rotation, the sediment in the sludge settling zone 44 is continuously discharged, preventing excessive sedimentation that could affect the normal operation of the high-efficiency sedimentation tank 4. Therefore, the combination of vertical and horizontal flow in the high-efficiency sedimentation tank 4 achieves rapid and efficient sedimentation of coagulated flocs, removing heavy metals from the wastewater as sediment. Furthermore, the ozone advanced oxidation process removes antibiotics, improves the biodegradability of the wastewater, and disinfects the effluent, saving investment. In addition, the high-efficiency solid-liquid separation of the flat sheet membrane module 12 replaces the secondary sedimentation tank, effectively ensuring clear and compliant effluent.

[0054] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A combined wastewater heavy metal and antibiotic removal device, comprising: The coagulation reaction zone (17), pre-sedimentation tank (3), high-efficiency sedimentation tank (4), ozone distribution zone (5), ozone oxidation tank (7), primary anoxic tank (8), primary aerobic tank (9), secondary anoxic tank (11), secondary aerobic tank (13) and disinfection tank (14) are symmetrically and fixedly connected to one side of the pre-sedimentation tank (3), and the high-efficiency sedimentation tank (4) is fixedly connected to the other side of the pre-sedimentation tank (3). The ozone distribution zone (5) is fixedly connected to one side of the high-efficiency sedimentation tank (4), the ozone oxidation tank (7) is fixedly connected to one side of the ozone distribution zone (5), the primary anoxic tank (8) is fixedly connected to one end of the ozone oxidation tank (7), the primary aerobic tank (9) is fixedly connected to one side of the primary anoxic tank (8), the secondary anoxic tank (11) is fixedly connected to one side of the primary aerobic tank (9), the secondary aerobic tank (13) is fixedly connected to one side of the secondary anoxic tank (11), and the disinfection tank (14) is fixedly connected to one side of the secondary aerobic tank (13). The feature is that a dosing tank (20) is uniformly and fixedly connected to the outer surface of the coagulation reaction zone (17), a mixer (2) is fixedly installed inside both the coagulation reaction zone (17) and the dosing tank (20), and a dosing pump (19) is fixedly installed inside the dosing tank (20). The ozone oxidation tank (7) is uniformly equipped with ozone baffles (6). The ozone distribution zone (5) and the first-stage aerobic tank (9) are both fixedly installed with aeration systems (10). The second-stage aerobic tank (13) is symmetrically fixedly installed with flat membrane modules (12). The coagulation reaction zone (17) is provided with an inlet (1) at one end. The disinfection tank (14) is provided with an outlet (15) at the center of its side. The ozone distribution zone (5) and the disinfection tank (14) are connected by an ozone pipe (21). An ozone generator (16) is provided in the middle of the ozone pipe (21) between the ozone distribution zone (5) and the disinfection tank (14). A cleaning component (23) is provided inside the pre-sedimentation tank (3) and the high-efficiency sedimentation tank (4). The cleaning component (23) includes a sludge discharge shaft (238), a second chain (239), and a drive shaft (241). The two ends of the second chain (239) are respectively meshed and connected to the outer surfaces of one end of the sludge discharge shaft (238) and the drive shaft (241). A drive water wheel (242) is fixedly installed on the middle outer surface of the drive shaft (241). A sludge discharge roller (237) is fixedly installed on the middle outer surface of the sludge discharge shaft (238). Sludge scraping grooves (235) are opened on the outer surface of the sludge discharge roller (237). The outer surfaces of both ends of the mud discharge shaft (238) and the drive shaft (241) are fixedly equipped with second sprockets (240). The outer surface of one end of the mud discharge shaft (238) is fixedly equipped with a first sprocket (233). The outer surface of the first sprocket (233) is meshed with a first chain (232). The inner surfaces of both ends of the first chain (232) are rotatably connected with a drive shaft (234). One end of the drive shaft (234) is meshed with a cleaning shaft (231). The outer surface of the middle part of the cleaning shaft (231) is fixedly equipped with a cleaning wire (236).

2. The wastewater heavy metal and antibiotic combined removal device according to claim 1, characterized in that, The pre-sedimentation tank (3) has a sedimentation tank (33) inside. A stress-relief square tube (34) is provided on one side of the sedimentation tank (33). A partition plate (35) is provided in the center of the stress-relief square tube (34). An overflow port (31) is provided on the outer surface of the middle part of the stress-relief square tube (34). An overflow baffle (32) is provided on the outer surface of the stress-relief square tube (34) and at the outer edge of the overflow port (31). A water injection head (36) is fixedly installed on the top edge of the stress-relief square tube (34).

3. The wastewater heavy metal and antibiotic combined removal device according to claim 2, characterized in that, The high-efficiency sedimentation tank (4) includes a limiting cylinder (41), a sludge discharge pipe (43), and a sludge sedimentation zone (44). The limiting cylinder (41) is fixedly installed at the bottom center of the sludge sedimentation zone (44). The sludge discharge pipe (43) is welded to the bottom center of the limiting cylinder (41). A limiting sleeve (42) is symmetrically welded to the outer surface of one end of the limiting cylinder (41). A central guide cylinder (45) is fixedly installed in the center of the sludge sedimentation zone (44). An inlet pipe (47) is fixedly connected to the upper outer surface of the central guide cylinder (45). A triangular overflow weir (46) is symmetrically fixedly installed at the top of the sludge sedimentation zone (44).

4. The wastewater heavy metal and antibiotic combined removal device according to claim 3, characterized in that, One end of the inlet pipe (47) is inserted into the upper end of the pre-sedimentation tank (3). A reflector plate is provided at the bottom of the central guide tube (45). An inclined tube is laid inside the sludge sedimentation zone (44). First limiting holes are opened on both sides of the upper part of the energy dissipation square tube (34). The drive water wheel (242) is rotated and locked inside the energy dissipation square tube (34) through the first limiting hole in the middle of the drive shaft (241).

5. The wastewater heavy metal and antibiotic combined removal device according to claim 4, characterized in that, The mud discharge roller (237) is rotatably engaged with the inner center of the limiting cylinder (41) via the mud discharge shaft (238). The drive shaft (234) is rotatably engaged with the outer surface of the limiting cylinder (41) via the limiting sleeve (42). A second limiting hole is provided on the outer surface of the middle part of the mud discharge pipe (43). The cleaning shaft (231) is rotatably engaged with the inside of the mud discharge pipe (43) via the second limiting hole.

6. The wastewater heavy metal and antibiotic combined removal device according to claim 5, characterized in that, The cleaning filament (236) is in contact with the outer surface of the mud discharge roller (237) inside the mud discharge pipe (43), and the drive water wheel (242) is aligned with the bottom of the water injection head (36) at the top of the energy dissipation square tube (34).

7. A method of using a wastewater heavy metal and antibiotic combined removal device, comprising the wastewater heavy metal and antibiotic combined removal device according to any one of claims 1-6, characterized in that, include: Step 1: Collect livestock and poultry breeding wastewater into the coagulation reaction zone (17) for coagulation. The mixture after coagulation reaction is transported into the pre-sedimentation tank (3) for pre-sedimentation and to reduce hydraulic kinetic energy. Step 2: Then the supernatant is transported into the interior of the high-efficiency sedimentation tank (4) to remove heavy metals by sedimentation; and the supernatant filtered by the inclined tube inside the high-efficiency sedimentation tank (4) flows into the water collection tank through the triangular overflow weir (46) and flows to the next process. Step 3: The water flows into the ozone distribution area (5), ozone oxidation tank (7), primary anoxic tank (8), primary aerobic tank (9) and secondary anoxic tank (11) in sequence through the collection tank to carry out oxidation and nitrification reactions, degrading antibiotics and recalcitrant organic matter. Step 4: Then, the mud and water are separated by the efficient solid-liquid separation of the flat sheet membrane module (12), and finally the clean water enters the disinfection tank (14). Then the activated sludge is periodically discharged to the sludge tank. The disinfection tank (14) is disinfected by ozone generated by the ozone generator (16) and discharged in compliance with standards.

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