An efficient system for treating livestock and poultry breeding wastewater using bacterial and algal symbiosis

Abstract

The present invention relates to the technical field of sewage treatment, and specifically to a system for efficiently treating livestock and poultry breeding sewage by utilizing bacteria and algae symbiosis. The system comprises a solid-liquid separation module arranged on the ground, the solid-liquid separation module comprises a water inlet pipe, a separation box and a filter basket, a nitrification and denitrification tank is arranged on the top of the ground, and a stirring component is arranged inside the nitrification and denitrification tank; a chemical phosphorus removal module comprises a coagulation and flocculation sedimentation tank and a stirring component, the coagulation and flocculation sedimentation tank is arranged on the ground, and the stirring component is arranged in the coagulation and flocculation area inside the coagulation and flocculation sedimentation tank; the system for efficiently treating livestock and poultry breeding sewage by utilizing bacteria and algae symbiosis of the present invention, compared with the existing method of removing the total nitrogen content in sewage by microbial means alone, utilizes the bacteria-algae symbiotic structure, and microalgae and bacteria synergistically remove pollutants in sewage in an oxidation pond, saving energy consumption and carbon source, while improving the sewage treatment effect.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and in particular to a system for efficiently treating livestock and poultry breeding sewage by utilizing bacteria and algae symbiosis. Background Art

[0002] Livestock and poultry wastewater is characterized by high COD and ammonia nitrogen levels, with COD levels exceeding 20,000 mg / L, ammonia nitrogen exceeding 2,000 mg / L, and total phosphorus concentrations around 300 mg / L. Common livestock and poultry wastewater treatment processes include solid-liquid separation, anaerobic evaporation, biological denitrification and phosphorus removal, chemical phosphorus removal, and effluent disinfection. Biological denitrification and phosphorus removal primarily involves a two-stage AO full-process nitrification and denitrification process, as well as newer integrated, short-process nitrification and denitrification processes. These processes utilize bacterial metabolism to remove pollutants, but they suffer from long hydraulic retention times, high energy consumption, and poor phosphorus removal, with biological treatment efficiencies sometimes reaching less than 50%. Recent research has shown that combining microalgae and bacteria to create a "bacteria-algae symbiotic" wastewater treatment system can significantly improve COD, ammonia nitrogen, and total phosphorus removal, with total phosphorus removal reaching over 80%. This offers the advantages of energy savings and reduced use of downstream chemical phosphorus removal agents. However, this technology is rarely used in actual projects. In particular, there are still many questions about how the "bacteria-algae symbiosis" treatment system can be combined with actual projects and how it can better play a role in actual sewage treatment projects.

[0003] The existing livestock and poultry wastewater treatment technology has the following deficiencies:

[0004] 1. The treatment method is relatively simple and wastes resources. The use of microbial means alone to remove the total nitrogen content in sewage converts Kjeldahl nitrogen and oxidized nitrogen into nitrogen gas through biological oxidation and reduction reactions and releases it into the air, resulting in a large waste of nitrogen resources.

[0005] 2. High energy consumption and carbon source consumption. The microbial denitrification process first converts reduced ammonia nitrogen into nitrate nitrogen and nitrite nitrogen under the action of nitrifying bacteria. This part of oxygen is achieved through mechanical supply, which consumes a lot of energy. Nitrate nitrogen and nitrite nitrogen are then reduced to nitrogen gas by denitrifying bacteria using carbon sources and released into the air. To achieve a high total nitrogen removal rate, additional carbon source is often required, which requires a large amount of carbon source.

[0006] 3. The biological phosphorus removal effect is poor. Biological phosphorus removal is mainly achieved by removing excess sludge and controlling a shorter sludge age. However, in order to achieve a better denitrification effect in the biological denitrification and phosphorus removal process, it is necessary to control the appropriate sludge age. The sludge age is generally not less than 20 days. Therefore, the biological phosphorus removal effect is poor, and a large amount of chemical phosphorus removal agents need to be added at the back end for chemical phosphorus removal, which has high operating costs.

[0007] 4. It is impossible to flexibly adjust the proportion of dissolved oxygen in sewage according to the degree of sewage pollution, and it is impossible to change the oxygen-deficient environment of sewage, which is not conducive to the subsequent denitrification treatment of sewage. Summary of the Invention

[0008] The purpose of the present invention is to provide a highly efficient system for treating livestock and poultry breeding wastewater by utilizing the symbiotic growth of bacteria and algae.

[0009] To achieve this object, the present invention adopts the following technical solutions:

[0010] Provided is a highly efficient system for treating livestock and poultry wastewater using bacterial and algal symbiosis, comprising a solid-liquid separation module located on the ground, the solid-liquid separation module comprising a water inlet pipe, a separation box, and a filter basket. The separation box is located on the ground, the water inlet pipe is fixedly mounted at one end of the top of the separation box, and the filter basket is inserted into the interior of the separation box; the system also comprises an anaerobic tank, an oxidation pond, a micro-aeration module, a nitrification and denitrification module, and a chemical phosphorus removal module.

[0011] The anaerobic tank is arranged beside the separation box, the anaerobic tank and the separation box are connected through a first discharge pipe, and the oxidation pond is arranged beside the anaerobic tank;

[0012] The micro-aeration module is located beside the oxidation pond and includes an aeration component, an adjustment component, a plurality of aeration tubes and a plurality of inner tubes. The aeration tubes are arranged at equal intervals inside the oxidation pond through two lapped frames. Each inner tube is rotated by two rotating shafts and is arranged inside an aeration tube. The aeration component is located between the ground and the plurality of inner tubes, and the adjustment component is located between the plurality of rotating shafts.

[0013] The nitrification and denitrification module is located next to the oxidation pond. The nitrification and denitrification module includes a nitrification and denitrification tank, a secondary sedimentation tank, and a stirring assembly. The nitrification and denitrification tank is located on the top of the ground, and the stirring assembly is located inside the nitrification and denitrification tank. A fixing frame is fixed in the secondary sedimentation tank, and a central guide tube is fixed in the fixing frame. An overflow weir is fixed on the inner wall of the secondary sedimentation tank.

[0014] The chemical phosphorus removal module is located next to the secondary sedimentation tank. The chemical phosphorus removal module includes a coagulation tank, a flocculation tank, a final sedimentation tank and a disinfection tank. The coagulation tank, the flocculation tank, the final sedimentation tank and the disinfection tank are integrated into a whole. The interior of the final sedimentation tank is also equipped with an overflow weir, a fixed frame and a central guide tube. Agitators are fixed inside the coagulation tank and the flocculation tank.

[0015] Furthermore: the inflation component includes an air pump, a dispersion pipe and several delivery pipes. The air pump is fixed on the top of the ground, the dispersion pipe is fixed on the output end of the air pump, and several delivery pipes are evenly spaced on the outer wall of the dispersion pipe.

[0016] Furthermore: the adjustment component includes a first motor, a chain and several sprockets, the first motor is fixed on the top of the oxidation pond, one of the sprockets is fixed on its output end, another sprocket is rotatably arranged on the top of the oxidation pond, and the remaining sprockets are respectively fixed on several rotating shafts close to the chain, the chain is sleeved on the outer walls of several sprockets, and one end of each conveying pipe away from the dispersion pipe is rotatably connected to one of the rotating shafts close to the sprocket through a bearing.

[0017] Furthermore: a plurality of avoidance holes are evenly spaced on the outer wall in the circumferential direction of each aeration tube, and a plurality of first aeration holes and a plurality of second aeration holes are evenly spaced on the outer wall in the circumferential direction of each inner tube, each first aeration hole is larger than the second aeration hole, and each first aeration hole is smaller than the avoidance hole, and the avoidance hole is consistent with the axial direction of the first aeration hole or the second aeration hole.

[0018] Furthermore, a water suction pump is fixedly provided at one end of the anaerobic tank and the oxidation pond, and between the other end of the oxidation pond and the nitrification and denitrification tank. A water suction pipe and a water delivery pipe are fixedly provided at both ends of the water suction pump.

[0019] Furthermore, a second discharge pipe is fixedly provided on the outer wall of the nitrification and denitrification tank, and a solenoid valve is fixedly provided on the outer wall of the second discharge pipe.

[0020] Furthermore: the inner bottom of the separation box is a slope structure, and a slot for inserting the filter basket is provided on the side wall of the separation box. Two baffles are symmetrically provided on the inner wall of the separation box. The two ends of the bottom of the filter basket are respectively overlapped with the top of the two baffles. A handle is fixed on the outer wall of one end of the filter basket, and a number of filter slots are provided on the outer wall of the filter basket.

[0021] Furthermore: the stirring assembly includes a second motor, a stirring shaft and several stirring plates. A support plate is fixedly provided on the inner top of the nitrification and denitrification tank. The stirring shaft is rotatably arranged on the support plate. The second motor is fixedly provided on the top of the support plate. Its output end is fixedly connected to the top of the stirring shaft through a coupling. Several stirring plates are evenly spaced on the outer wall of the stirring shaft, and each stirring plate is provided with several stirring holes on the outer wall.

[0022] Furthermore: a sealing cover is provided on the top of the anaerobic tank.

[0023] Furthermore, an impermeable membrane is laid on the inner bottom of the oxidation pond, and a plurality of culture containers are arranged at equal intervals on the top of the impermeable membrane.

[0024] Beneficial effects of the present invention:

[0025] 1. The present invention treats sewage by designing a bacteria-algae symbiotic structure. Microalgae and bacteria work together in the oxidation pond to remove pollutants in the sewage. Compared with the existing method of using microorganisms alone to remove the total nitrogen content in sewage, it saves energy consumption and carbon sources, and improves the treatment effect. Experimental verification shows that the bacteria-algae symbiotic system can remove total nitrogen and organic matter while having a higher carbon-nitrogen ratio in the effluent, creating favorable conditions for the next step of deep nitrification, denitrification and denitrification, accelerating the rate of sewage treatment, and making sewage treatment more efficient.

[0026] 2. The micro-aeration module in this invention maintains a relatively mixed wastewater state, allowing microalgae to fully absorb sunlight and promote their growth. Furthermore, the anoxic environment created by micro-aeration provides favorable conditions for biological denitrification processes such as simultaneous nitrification and denitrification, as well as short-range nitrification and denitrification. This creates a suitable environment for the growth of "bacteria-algae symbiotic communities."

[0027] 3. The present invention uses inoculated Chlorella species and anaerobic aerobic bacteria. As the bacteria and microalgae gradually grow, they form a bacterial floc with a large number of attached microalgae. This combined bacterial floc plays a major role in degrading pollutants in the "bacteria-algae symbiosis" system. In this system, the Chlorella fixes nitrogen and phosphorus in the water through photosynthesis, reducing the water's nitrogen and phosphorus concentrations. The oxygen released simultaneously supplies the bacteria. During their own metabolism, the bacteria consume the oxygen produced by photosynthesis and release the carbon dioxide concentration required for microalgae growth, thereby promoting algal growth. In addition, some of the dead microalgae provide dissolved organic carbon for bacterial growth, increasing the carbon-nitrogen ratio of the water and providing a carbon source for further denitrification by the bacteria. Extensive research has shown that the "bacteria-algae symbiosis" approach is more effective than using the same biomass of microorganisms alone to decompose pollutants. The oxygen produced by the microalgae greatly reduces the total amount of additional oxygen supply and reduces the need for an external carbon source for microbial denitrification. The microalgae fix the nitrogen and phosphorus pollutants in the water within themselves, achieving nitrogen and phosphorus capture. The sludge discharged from the "bacteria-algae symbiotic system" is dehydrated and fermented to produce organic fertilizer rich in nitrogen and phosphorus, realizing resource utilization and circular economy.

[0028] 4. The present invention, through the design of the regulating component, can flexibly adjust the amount of aeration inside the oxidation pond according to the degree of sewage pollution, thereby adjusting the proportion of dissolved oxygen inside the oxidation pond, changing the anoxic environment of the sewage, and thus enabling bacteria to facilitate denitrification processes such as simultaneous nitrification and denitrification and short-range nitrification and denitrification, thereby helping to improve the denitrification effect of sewage.

[0029] 5. The present invention utilizes an impermeable membrane to prevent the generated bacteria and microalgae from growing underground, while also preventing groundwater from penetrating into the oxidation pond. This helps improve the pollutant degradation efficiency of the combined bacterial flocs. Several incubators are used to inoculate Chlorella species and anaerobic aerobic bacteria, respectively. As the bacteria and microalgae gradually grow, a bacterial floc with a large amount of microalgae attached is formed. This combined bacterial floc plays a major role in degrading pollutants in the "bacteria-algae symbiosis" system. The equal spacing of the several incubators ensures uniform cultivation of the Chlorella species and anaerobic aerobic bacteria, achieving a uniform inoculation effect. This helps improve the degradation of pollutants in the sewage input into the oxidation pond, preventing any omissions and improving the uniformity of pollutant degradation within the oxidation pond.

[0030] 6. The present invention is designed to have a nitrification and denitrification reaction module. After the total nitrogen and organic matter in the sewage are removed in large quantities by the bacteria-algae symbiotic system, the sewage still contains part of the total nitrogen and organic matter. In order to improve the total pollutant removal rate of the entire system, a deep nitrification and denitrification reaction module is set. The sewage treated by the bacteria-algae symbiotic system enters the interior of the nitrification and denitrification reaction tank. The second motor is started by the controller. Since its output end is fixedly connected to the end of the stirring shaft through a coupling, the stirring shaft is rotatably connected to the support plate, and several stirring plates are fixedly connected to the rotating shaft, thereby driving several stirring plates to rotate. Several stirring holes can improve the stirring efficiency, and adjust the dissolved oxygen content inside the nitrification reaction tank so that the nitrogen-containing substances in the sewage are in a nitrified state. Then, denitrification reaction is carried out to further remove the ammonia nitrogen content, organic matter concentration and total nitrogen content in the sewage. The effluent is trapped by the secondary sedimentation tank, and the partially trapped sludge is returned to the nitrification and denitrification reaction tank to maintain the sludge amount of the reaction tank and achieve deep denitrification.

[0031] 7. The present invention designs a chemical phosphorus removal module. After being treated by the bacteria-algae symbiotic system and the deep nitrification and denitrification module, the total phosphorus content in the water may still exceed the standard, especially when the total phosphorus content in the effluent is required to reach below 1 mg / L. Therefore, the present invention designs a chemical phosphorus removal module, and chemical phosphorus removal agents are added through coagulation and flocculation to achieve chemical phosphorus removal. The effluent is disinfected and discharged after sedimentation. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings in the embodiments of the present invention.

[0033] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0034] Figure 2 for Figure 1 A magnified view of point A in the figure;

[0035] Figure 3 Schematic diagram of the three-dimensional structure of the oxidation pond of the present invention;

[0036] Figure 4 for Figure 3 Enlarged view of point B in FIG.

[0037] Figure 5 Schematic diagram of the cross-sectional structure of the aeration pipe, inner pipe, sprocket and rotating shaft of the present invention;

[0038] Figure 6 for Figure 5 Enlarged view of point C in the figure;

[0039] Figure 7 A top view of the present invention;

[0040] Figure 8 Schematic diagram of the cross-sectional structure of the separation box of the present invention;

[0041] Figure 9 Schematic diagram of the three-dimensional structure of the nitrification and denitrification tank of the present invention;

[0042] Figure 10 Schematic diagram of the three-dimensional structure of the chemical phosphorus removal module of the present invention;

[0043] Figure 11 This is the overall flow chart of the present invention.

[0044] Figure: 1, water inlet pipe; 2, separation box; 3, filter basket; 4, anaerobic tank; 5, oxidation pond; 7, aeration pipe; 8, inner pipe; 9, lap frame; 10, rotating shaft; 11, nitrification and denitrification tank; 12, air pump; 13, dispersion pipe; 14, delivery pipe; 15, first motor; 16, chain; 17, sprocket; 18, avoidance hole; 19, first aeration hole; 20, second aeration hole; 24, second discharge pipe. 25. Solenoid valve; 26. Baffle; 27. Handle; 28. Filter tank; 29. ​​Second motor; 30. Stirring shaft; 31. Stirring plate; 32. Stirring hole; 33. Sealing cover; 34. Anti-seepage membrane; 35. Incubator; 36. Secondary sedimentation tank; 37. Fixed frame; 38. Central guide tube; 39. Overflow weir; 40. Coagulation tank; 41. Flocculation tank; 42. Final sedimentation tank; 43. Disinfection tank; 44. Mixer. DETAILED DESCRIPTION

[0045] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0046] Among them, the drawings are only used for illustrative purposes and represent only schematic diagrams rather than actual pictures, and should not be understood as limitations on this patent; in order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product.

[0047] Reference Figures 1 to 9As shown, a highly efficient system for treating livestock and poultry wastewater using bacterial and algal symbiosis includes a solid-liquid separation module located on the ground. The solid-liquid separation module includes a water inlet pipe 1, a separation box 2, and a filter basket 3. The separation box 2 is located on the ground, the water inlet pipe 1 is fixed to one end of the top of the separation box 2, and the filter basket 3 is inserted into the interior of the separation box 2; the system also includes an anaerobic tank 4, an oxidation pond 5, a micro-aeration module, and a nitrification and denitrification module.

[0048] The anaerobic tank 4 is arranged beside the separation box 2, and the anaerobic tank 4 and the separation box 2 are connected through a first discharge pipe. The oxidation pond 5 is arranged beside the anaerobic tank 4. The bacteria-algae symbiotic structure synergistically removes pollutants in the sewage in the oxidation pond 5. Compared with the traditional method of using microorganisms alone to remove total nitrogen, it is more efficient and saves energy and carbon sources. After experimental verification, the bacteria-algae symbiotic structure can remove total nitrogen and organic matter at the same time, and the carbon-nitrogen ratio of the effluent is higher, which creates favorable conditions for the next step of deep denitrification. The chlorella in the structure fixes nitrogen and phosphorus in the water through photosynthesis, effectively reducing the nitrogen and phosphorus concentrations of the sewage. At the same time, the released oxygen is provided to the bacteria. In the process of their own metabolism, the bacteria will consume the oxygen for photosynthesis and release the carbon dioxide concentration required for the growth of microalgae, thereby promoting the enhanced growth of algae. In addition, some dead microalgae can provide dissolved organic carbon for bacterial growth, thereby increasing the carbon-nitrogen ratio of water. The two complement each other and provide a carbon source for bacteria to further denitrify.

[0049] The micro-aeration module is located beside the oxidation pond 5. The micro-aeration module includes an aeration component, an adjustment component, a plurality of aeration tubes 7 and a plurality of inner tubes 8. The plurality of aeration tubes 7 are evenly spaced inside the oxidation pond 5 through two bridging frames 9. Each inner tube 8 is rotated by two rotating shafts 10 and is located inside an aeration tube 7. The aeration component is located between the ground and the plurality of inner tubes 8, and the adjustment component is located between the plurality of rotating shafts 10.

[0050] The nitrification and denitrification module is located next to the oxidation pond 5. The nitrification and denitrification module includes a nitrification and denitrification tank 11, a secondary sedimentation tank 36, and a stirring assembly. The nitrification and denitrification tank 11 is located on the top of the ground. The stirring assembly is located inside the nitrification and denitrification tank 11. A fixing frame 37 is fixed in the secondary sedimentation tank 36. A central guide tube 38 is fixed in the fixing frame 37. An overflow weir 39 is fixed on the inner wall of the secondary sedimentation tank 36. After passing through the oxidation pond 5, the sewage enters the nitrification and denitrification tank 11. After being stirred and mixed by the stirring assembly, the sewage enters the chemical phosphorus removal module through a gravity pipe for phosphorus removal treatment.

[0051] The chemical phosphorus removal module is arranged beside the secondary sedimentation tank 36. The chemical phosphorus removal module includes a coagulation tank 40, a flocculation tank 41, a final sedimentation tank 42 and a disinfection tank 43. The coagulation tank 40, the flocculation tank 41, the final sedimentation tank 42 and the disinfection tank 43 are integrated into a whole. The interior of the final sedimentation tank 42 is also provided with an overflow weir 39, a fixing frame 37 and a central guide tube 38. The interior of the coagulation tank 40 and the flocculation tank 41 are both fixed with a mixer 44. The sewage first enters the coagulation tank 40, and the phosphorus removal agent is added to the coagulation tank 40 through the stirring of the mixer 44 in the coagulation tank 40. The After reaching full concentration, the sewage treated by the coagulation tank 40 enters the flocculation tank 41. Similarly, the sewage is stirred by the mixer 44 to mix and react with the phosphorus removal agent to form flocs. The treated sewage enters the final sedimentation tank 42 for sedimentation treatment. The sedimentation forms two layers, and the upper treated water enters the disinfection tank 43 through the gravity pipe. Disinfectant is added to the disinfection tank 43 for disinfection. At the same time, an existing equipment aerator is added to the disinfection tank 43. The water in the disinfection tank 43 is contacted with the air through the aerator to form gas stirring, thereby making the disinfection effect better.

[0052] Reference Figures 1 to 9 As shown, the inflation component includes an air pump 12, a dispersion pipe 13 and a plurality of delivery pipes 14. The air pump 12 is fixedly installed on the top of the ground, the dispersion pipe 13 is fixedly installed on the output end of the air pump 12, and the plurality of delivery pipes 14 are evenly spaced on the outer wall of the dispersion pipe 13. When the combined bacterial flocs are treating the sewage, the air pump 12 is started by the controller. Since the dispersion pipe 13 is fixedly connected to the output end of the air pump 12, the plurality of delivery pipes 14 are evenly spaced on the outer wall of the dispersion pipe 13. The end of each delivery pipe 14 away from the dispersion pipe 13 is rotatably connected to one of the rotating shafts 10 near the sprocket 17 through a bearing. Each delivery pipe 14 near the sprocket 17 is connected to the rotating shaft 10 through a bearing. The rotating shafts 10 are all hollow structures, so that the air is transported to the interior of the inner tubes 8 through the input end, output end, dispersion pipe 13 and several delivery pipes 14 of the air pump 12 in sequence. The air entering the inner tube 8 is ejected from the aeration pipe 7 through the first aeration hole 19 and the avoidance hole 18 in sequence, impacting the sewage in the oxidation pond 5 to form bubbles. The dissolved oxygen is controlled at about 0.5 mg / L, so that the sewage water body is in a relatively mixed state, allowing the microalgae to fully receive light and promote the growth of microalgae. At the same time, the anoxic environment formed by micro-aeration can provide good conditions for bacteria to perform denitrification processes such as simultaneous nitrification and denitrification and short-range nitrification and denitrification.

[0053] Reference Figures 1 to 9As shown, the adjustment component includes a first motor 15, a chain 16 and several sprockets 17. The first motor 15 is fixed on the top of the oxidation pond 5, one of the sprockets 17 is fixed on its output end, and another sprocket 17 is rotatably arranged on the top of the oxidation pond 5. The remaining sprockets 17 are respectively fixed on several rotating shafts 10 close to the chain 16. The chain 16 is sleeved on the outer walls of several sprockets 17. The end of each conveying pipe 14 away from the dispersion pipe 13 is rotatably connected to one of the rotating shafts 10 close to the sprocket 17 through a bearing. When the micro-aeration efficiency needs to be adjusted, the first motor 15 is started by the controller, and the One of the sprockets 17 is fixedly connected to its output end, another sprocket 17 is rotatably connected to the top of the oxidation pond 5, and the remaining sprockets 17 are respectively fixedly connected to several rotating shafts 10 close to the chain 16. Several sprockets 17 are sleeved through the chain 16. One end of each conveying pipe 14 away from the dispersion pipe 13 is rotatably connected to one of the rotating shafts 10 close to the sprocket 17 through a bearing. Each inner tube 8 is rotatably connected to an aeration tube 7 through two rotating shafts 10, thereby causing the several inner tubes 8 to rotate counterclockwise inside the several aeration tubes 7 until each second aeration hole 20 is aligned with an avoidance hole 18.

[0054] Reference Figures 1 to 9 As shown, a plurality of avoidance holes 18 are evenly spaced on the outer wall of each aeration tube 7 in the circumferential direction, and a plurality of first aeration holes 19 and a plurality of second aeration holes 20 are evenly spaced on the outer wall of each inner tube 8 in the circumferential direction. Each first aeration hole 19 is larger than the second aeration hole 20, and each first aeration hole 19 is smaller than the avoidance hole 18. The avoidance hole 18 is in the same direction as the axis of the first aeration hole 19 or the second aeration hole 20. When each second aeration hole 20 is aligned with one avoidance hole 18, due to the circumferential direction of each inner tube 8, the air inlet 18 is equal to the air outlet 18. A plurality of first aeration holes 19 and a plurality of second aeration holes 20 are designed at equal intervals on the upward outer wall. Each first aeration hole 19 is larger than the second aeration hole 20, and each first aeration hole 19 is smaller than the avoidance hole 18. The avoidance hole 18 is aligned with the axial direction of the first aeration hole 19 or the second aeration hole 20, so that the air entering the inner tube 8 passes through the plurality of second aeration holes 20 in sequence and is ejected from the plurality of avoidance holes 18, so that the generated bubbles are smaller, the proportion of dissolved oxygen is adjusted, the anoxic environment of the sewage is changed, and the denitrification efficiency of the sewage is adjusted.

[0055] Reference Figures 1 to 9As shown, a water suction pump is fixedly provided at one end of the anaerobic tank 4 and the oxidation pond 5, as well as between the other end of the oxidation pond 5 and the nitrification and denitrification tank 11. A suction pipe and a water supply pipe are fixedly provided at both ends of the water suction pump. The system is equipped with a controller, and each driving device in the system is electrically connected to the controller. After the anaerobic tank 4 performs preliminary treatment on the sewage, the water suction pump located between the anaerobic tank 4 and the oxidation pond 5 is started by the controller, so that the sewage after preliminary treatment is input into the interior of the oxidation pond 5 through the suction pipe, the water suction pump and the water supply pipe, so as to facilitate the bacteria-algae symbiotic structure inside the oxidation pond 5 to degrade the pollutants in the sewage. After the sewage is treated by the oxidation pond 5, the water suction pump located between the oxidation pond 5 and the nitrification and denitrification tank 11 is started by the controller, and the sewage treated in the oxidation pond 5 is transported to the nitrification and denitrification tank 11 through the suction pipe, the water suction pump and the water supply pipe.

[0056] Reference Figures 1 to 9 As shown, a second discharge pipe 24 is fixedly provided on the outer wall of the nitrification and denitrification tank 11, and a solenoid valve 25 is fixedly provided on the outer wall of the second discharge pipe 24. When the ammonia nitrogen content, organic matter concentration and total nitrogen content in the sewage are further removed, the solenoid valve 25 is activated by the controller to open the second discharge pipe 24, and then the treated sewage is transported to the secondary sedimentation tank 36. After the water is trapped by the secondary sedimentation sludge, the supernatant flows into the deep treatment system for final treatment to achieve the purification effect.

[0057] Reference Figures 1 to 9 As shown, the inner bottom of the separation box 2 is a slope structure, and a slot for inserting the filter basket 3 is provided on the side wall of the separation box 2. Two baffles 26 are symmetrically provided on the inner wall of the separation box 2. The two ends of the bottom of the filter basket 3 are overlapped with the tops of the two baffles 26 respectively. A handle 27 is fixed on the outer wall of one end of the filter basket 3. A plurality of filter slots 28 are provided on the outer wall of the filter basket 3. When the livestock and poultry breeding wastewater is treated, the wastewater is discharged into the interior of the separation box 2 through the water inlet pipe 1. The solids in the wastewater are filtered by the plurality of filter slots 28 to the top of the filter basket 3 for temporary storage, and the remaining wastewater is temporarily stored in the filter basket 3. The water continues to fall into the inner bottom of the separation box 2 through several filter tanks 28, realizing solid-liquid separation of the sewage. Since the inner bottom of the separation box 2 is a slope mechanism, the anaerobic tank 4 and the separation box 2 are connected through the first discharge pipe 6, and the first discharge pipe 6 is designed to be inclined, so that the sewage after the solids are removed flows into the interior of the anaerobic tank 4 through the first discharge pipe 6 for preliminary treatment of the sewage. Specifically, the anaerobic tank 4 decomposes the large molecular organic matter in the sewage into small molecular organic matter, and at the same time reduces the concentration of organic matter, which facilitates the improvement of the subsequent treatment efficiency of pollutants such as organic matter in the sewage.

[0058] Reference Figures 1 to 9As shown, the stirring assembly includes a second motor 29, a stirring shaft 30 and a plurality of stirring plates 31. A support plate is fixedly provided on the inner top of the nitrification and denitrification tank 11. The stirring shaft 30 is rotatably provided on the support plate. The second motor 29 is fixedly provided on the top of the support plate. The output end thereof is fixedly connected to the top of the stirring shaft 30 through a coupling. A plurality of stirring plates 31 are equidistantly provided on the outer wall of the stirring shaft 30. A plurality of stirring holes 32 are provided on the outer wall of each stirring plate 31. After the total nitrogen and organic matter in the sewage are removed by the bacteria-algae symbiotic system, the sewage after the total nitrogen and organic matter are removed is transported to the sewage. The second motor 29 is started by the controller after entering the nitrification and denitrification tank 11. Since the output end of the second motor 29 is fixedly connected to the end of the stirring shaft 30 through a coupling, the stirring shaft 30 is rotatably connected to the support plate, and the plurality of stirring plates 31 are fixedly connected to the rotating shaft 10, thereby driving the plurality of stirring plates 31 to rotate. The plurality of stirring holes 32 can improve the stirring efficiency to adjust the dissolved oxygen content in the nitrification and denitrification tank 11, so that the nitrogen-containing substances in the sewage are in a short-range nitrification state, and then the ammonia oxidation reaction is carried out to further remove the ammonia nitrogen content, organic matter concentration and total nitrogen content in the sewage.

[0059] Reference Figures 1 to 9 As shown, a sealing cover 33 is provided on the top of the anaerobic tank 4. The sealing cover 33 is used to cover the top of the anaerobic tank 4 so that the anaerobic tank 4 remains sealed. The oxidation pond 5 is mainly used to decompose the large molecular organic matter in the sewage into small molecular organic matter and reduce the concentration of organic matter. This process does not require the participation of oxygen. Therefore, the design of the sealing cover 33 is conducive to improving the decomposition efficiency and accelerating the progress of sewage treatment.

[0060] Reference Figures 1 to 9 As shown, an impermeable membrane 34 is laid on the inner bottom of the oxidation pond 5, and a number of culture vessels 35 are evenly spaced on the top of the impermeable membrane 34. The impermeable membrane 34 can prevent the generated bacteria and microalgae from growing underground, and at the same time prevent groundwater from penetrating into the oxidation pond 5, which is beneficial to improving the degradation efficiency of the combined bacterial flocs on pollutants. Several culture vessels 35 are used to inoculate Chlorella species and anaerobic aerobic bacteria species respectively. As the bacteria and microalgae gradually grow, bacterial flocs with a large number of microalgae attached are formed. This combined bacterial floc plays the main role in degrading pollutants in the "bacteria-algae symbiosis" system. The purpose of designing the number of culture vessels 35 at equal intervals is to ensure that the Chlorella species and anaerobic aerobic bacteria species are evenly cultured, so as to achieve the effect of uniform inoculation, which is beneficial to improving the degradation effect of pollutants in the sewage input into the oxidation pond 5, without causing omissions, and improving the uniformity of pollutant degradation inside the oxidation pond 5.

[0061] The working principle of the present invention is as follows: when treating livestock and poultry breeding wastewater, the wastewater is discharged into the interior of the separation box 2 through the water inlet pipe 1, and the solids in the wastewater are filtered by several filter tanks 28 to the top of the filter basket 3 for temporary storage, while the remaining wastewater continues to fall into the inner bottom of the separation box 2 through several filter tanks 28, thereby realizing solid-liquid separation of the wastewater. Since the inner bottom of the separation box 2 is a slope mechanism, the anaerobic tank 4 and the separation box 2 are connected through the first discharge pipe 6, and the first discharge pipe 6 is designed to be inclined, so that the wastewater after the solids are removed flows into the interior of the anaerobic tank 4 through the first discharge pipe 6 for preliminary treatment of the wastewater. Specifically, the anaerobic tank 4 decomposes the large molecular organic matter in the wastewater into small molecular organic matter, and at the same time reduces the concentration of organic matter, thereby facilitating the improvement of the subsequent treatment efficiency of pollutants such as organic matter in the wastewater.

[0062] The sealing cover 33 is used to cover the top of the anaerobic tank 4 so that the anaerobic tank 4 remains sealed. The oxidation pond 5 is mainly used to decompose the large molecular organic matter in the sewage into small molecular organic matter and reduce the concentration of organic matter. This process does not require the participation of oxygen. Therefore, the design of the sealing cover 33 is conducive to improving the decomposition efficiency and accelerating the progress of sewage treatment.

[0063] This system is equipped with a controller, and all driving devices in this system are electrically connected to the controller. After the anaerobic tank 4 has preliminarily treated the sewage, the controller starts the water suction pump located between the anaerobic tank 4 and the oxidation pond 5, so that the preliminarily treated sewage is input into the interior of the oxidation pond 5 through the suction pipe, the water suction pump and the water supply pipe, so as to facilitate the bacteria-algae symbiotic structure inside the oxidation pond 5 to degrade the pollutants in the sewage.

[0064] The anti-seepage membrane 34 can prevent the generated bacteria and microalgae from growing underground, and at the same time prevent groundwater from penetrating into the oxidation pond 5, which is beneficial to improving the degradation efficiency of the combined bacterial flocs on pollutants. Several culture vessels 35 are used to inoculate Chlorella species and anaerobic aerobic bacteria species respectively. As the bacteria and microalgae gradually grow, bacterial flocs with a large number of microalgae attached are formed. This combined bacterial floc plays the main role in degrading pollutants in the "bacteria-algae symbiosis" system. The design of equidistantly spaced several culture vessels 35 is to ensure that the Chlorella species and anaerobic aerobic bacteria species are evenly cultured to achieve a uniform inoculation effect, which is beneficial to improving the degradation effect of pollutants in the sewage input into the oxidation pond 5, without causing omissions, and improving the uniformity of pollutant degradation inside the oxidation pond 5.

[0065] While the combined bacterial flocculents are treating the sewage, the air pump 12 is started by the controller. Since the dispersion pipe 13 is fixedly connected to the output end of the air pump 12, several delivery pipes 14 are designed at equal intervals on the outer wall of the dispersion pipe 13. The end of each delivery pipe 14 away from the dispersion pipe 13 is rotatably connected to one of the rotating shafts 10 near the sprocket 17 through a bearing. Each rotating shaft 10 near the sprocket 17 has a hollow structure, so that air is sequentially transported to the interior of the several inner tubes 8 through the input end and output end of the air pump 12, the dispersion pipe 13, and the several delivery pipes 14. The air entering the inner tube 8 is sequentially ejected from the aeration pipe 7 through the first aeration hole 19 and the avoidance hole 18, impacting the sewage in the oxidation pond 5 and forming bubbles. The dissolved oxygen is controlled at about 0.5 mg / L, keeping the sewage water in a relatively mixed state, allowing the microalgae to fully receive light and promote the growth of microalgae. At the same time, the anoxic environment formed by micro-aeration can provide good conditions for bacteria to carry out denitrification processes such as simultaneous nitrification and denitrification and short-range nitrification and denitrification.

[0066] When the micro-aeration efficiency needs to be adjusted, the first motor 15 is started through the controller. Since one of the sprockets 17 is fixedly connected to its output end, another sprocket 17 is rotatably connected to the top of the oxidation pond 5, and the remaining sprockets 17 are respectively fixedly connected to several rotating shafts 10 close to the chain 16, and several sprockets 17 are sleeved through the chain 16. The end of each conveying pipe 14 away from the dispersion pipe 13 is rotatably connected to one of the rotating shafts 10 close to the sprocket 17 through a bearing, and each inner tube 8 is rotatably connected to an aeration tube 7 through two rotating shafts 10, so that the several inner tubes 8 rotate counterclockwise inside the several aeration tubes 7 until each second aeration hole 20 is aligned with an avoidance hole 18.

[0067] When each second aeration hole 20 is aligned with an avoidance hole 18, since a plurality of first aeration holes 19 and a plurality of second aeration holes 20 are designed at equal intervals on the outer wall in the circumferential direction of each inner tube 8, each first aeration hole 19 is larger than the second aeration hole 20, and each first aeration hole 19 is smaller than the avoidance hole 18, the avoidance hole 18 is consistent with the axial direction of the first aeration hole 19 or the second aeration hole 20, so that the air entering the inner tube 8 passes through the plurality of second aeration holes 20 in sequence and is ejected from the plurality of avoidance holes 18, so that the bubbles generated are smaller, the proportion of dissolved oxygen is adjusted to change the anoxic environment of the sewage, and further achieve the effect of adjusting the denitrification efficiency.

[0068] After the sewage is treated in the oxidation pond 5, the controller starts the water suction pump between the oxidation pond 5 and the nitrification and denitrification tank 11, and the treated sewage in the oxidation pond 5 is transported to the nitrification and denitrification tank 11 through the suction pipe, the water suction pump and the water delivery pipe.

[0069] After the total nitrogen and organic matter in the sewage are removed by the bacteria-algae symbiotic system, when the sewage with total nitrogen and organic matter removed is input into the nitrification and denitrification tank 11, the second motor 29 is started by the controller. Since its output end is fixedly connected to the end of the stirring shaft 30 through a coupling, the stirring shaft 30 is rotatably connected to the support plate, and the multiple stirring plates 31 are all fixedly connected to the rotating shaft 10, thereby driving the multiple stirring plates 31 to rotate. The multiple stirring holes 32 can improve the stirring efficiency to adjust the dissolved oxygen content in the nitrification and denitrification tank 11, so that the nitrogen-containing substances in the sewage are in a short-range nitrification state, and then an ammonia oxidation reaction is carried out to further remove the ammonia nitrogen content, organic matter concentration and total nitrogen content in the sewage.

[0070] When the ammonia nitrogen content, organic matter concentration and total nitrogen content in the sewage are further removed, the solenoid valve 25 is started by the controller to open the second discharge pipe 24, and then the treated sewage is transported to the secondary sedimentation tank 36. After the water is trapped by the secondary sedimentation sludge, the supernatant flows into the chemical phosphorus removal module for final treatment. The sewage first enters the coagulation tank 40, and is stirred by the mixer 44 in the coagulation tank 40. The phosphorus removal agent is added to the coagulation tank 40, and the mixing is fully achieved by the mixer 44. Then, the sewage is treated by the coagulation tank 40. The sewage enters the flocculation tank 41, and is stirred by the mixer 44 to mix the sewage and the phosphorus removal agent to form flocs. The treated sewage enters the final sedimentation tank 42 for sedimentation treatment, and the sedimentation forms two layers, and the treated water in the upper layer enters the disinfection tank 43 through the gravity pipe. Disinfectant is added to the disinfection tank 43 for disinfection. At the same time, an existing aerator is added to the disinfection tank 43. The aerator is used to contact the water in the disinfection tank 43 with the air and form a gas stirring effect, thereby improving the disinfection effect.

Claims

1. A highly efficient system for treating livestock and poultry breeding wastewater using bacterial and algal symbiosis, comprising a solid-liquid separation module disposed on the ground, the solid-liquid separation module comprising a water inlet pipe (1), a separation box (2) and a filter basket (3), the separation box (2) being disposed on the ground, the water inlet pipe (1) being fixedly disposed at one end of the top of the separation box (2), and the filter basket (3) being inserted into the interior of the separation box (2), characterized in that: It also includes an anaerobic tank (4), an oxidation pond (5), a micro-aeration module, a nitrification and denitrification module, and a chemical phosphorus removal module; The anaerobic tank (4) is arranged beside the separation box (2), the anaerobic tank (4) and the separation box (2) are connected through a first discharge pipe, and the oxidation pond (5) is arranged beside the anaerobic tank (4); The micro-aeration module is arranged beside the oxidation pond (5), and comprises an aeration component, an adjustment component, a plurality of aeration tubes (7) and a plurality of inner tubes (8). The plurality of aeration tubes (7) are arranged at equal intervals inside the oxidation pond (5) via two lap joints (9). Each inner tube (8) is arranged inside an aeration tube (7) and rotates via two rotating shafts (10). The aeration component is arranged between the ground and the plurality of inner tubes (8), and the adjustment component is arranged between the plurality of rotating shafts (10). The nitrification and denitrification module is arranged beside the oxidation pond (5). The nitrification and denitrification module includes a nitrification and denitrification tank (11), a secondary sedimentation tank (36) and a stirring assembly. The nitrification and denitrification tank (11) is arranged on the top of the ground. The stirring assembly is arranged inside the nitrification and denitrification tank (11). A fixing frame (37) is fixed inside the secondary sedimentation tank (36). A central guide tube (38) is fixed in the fixing frame (37). An overflow weir (39) is fixed on the inner wall of the peripheral side of the secondary sedimentation tank (36). The chemical phosphorus removal module is arranged beside the secondary sedimentation tank (36). The chemical phosphorus removal module includes a coagulation tank (40), a flocculation tank (41), a final sedimentation tank (42) and a disinfection tank (43). The coagulation tank (40), the flocculation tank (41), the final sedimentation tank (42) and the disinfection tank (43) are integrated into a whole. An overflow weir (39), a fixing frame (37) and a central guide tube (38) are also arranged inside the final sedimentation tank (42). A stirrer (44) is fixed inside the coagulation tank (40) and the flocculation tank (41). The inflation assembly comprises an air pump (12), a dispersion pipe (13) and a plurality of delivery pipes (14); the air pump (12) is fixedly arranged on the top of the ground; the dispersion pipe (13) is fixedly arranged on the output end of the air pump (12); and the plurality of delivery pipes (14) are arranged on the outer wall of the dispersion pipe (13) at equal intervals. The regulating assembly comprises a first motor (15), a chain (16) and a plurality of sprockets (17), wherein the first motor (15) is fixedly arranged on the top of the oxidation pond (5), one of the sprockets (17) is fixedly arranged on the output end thereof, another sprocket (17) is rotatably arranged on the top of the oxidation pond (5), and the remaining sprockets (17) are respectively fixedly arranged on a plurality of rotating shafts (10) close to the chain (16), the chain (16) is sleeved on the outer walls of the plurality of sprockets (17), and one end of each conveying pipe (14) away from the dispersion pipe (13) is rotatably connected to one of the rotating shafts (10) close to the sprocket (17) through a bearing; A plurality of avoidance holes (18) are evenly spaced on the outer wall in the circumferential direction of each aeration tube (7), and a plurality of first aeration holes (19) and a plurality of second aeration holes (20) are evenly spaced on the outer wall in the circumferential direction of each inner tube (8). Each first aeration hole (19) is larger than the second aeration hole (20), and each first aeration hole (19) is smaller than the avoidance hole (18). The avoidance hole (18) is aligned with the axis direction of the first aeration hole (19) or the second aeration hole (20).

2. The highly efficient system for treating livestock and poultry breeding wastewater by utilizing bacterial and algal symbiosis according to claim 1 is characterized by: A water suction pump is fixedly provided at one end of the anaerobic tank (4) and the oxidation pond (5) and between the other end of the oxidation pond (5) and the nitrification and denitrification tank (11). A water pumping pipe and a water delivery pipe are fixedly provided at both ends of the water suction pump.

3. The highly efficient system for treating livestock and poultry breeding wastewater by utilizing bacterial and algal symbiosis according to claim 2 is characterized by: A second discharge pipe (24) is fixedly provided on the outer wall of the nitrification and denitrification tank (11), and a solenoid valve (25) is fixedly provided on the outer wall of the second discharge pipe (24).

4. The highly efficient system for treating livestock and poultry breeding wastewater by utilizing bacterial and algal symbiosis according to claim 3 is characterized by: The inner bottom of the separation box (2) is a slope structure. A slot for inserting the filter basket (3) is provided on the side wall of the separation box (2). Two baffles (26) are symmetrically provided on the inner wall of the separation box (2). The two ends of the bottom of the filter basket (3) are respectively overlapped with the tops of the two baffles (26). A handle (27) is fixedly provided on the outer wall of one end of the filter basket (3). A plurality of filter slots (28) are provided on the outer wall of the filter basket (3).

5. The highly efficient system for treating livestock and poultry breeding wastewater by utilizing bacterial and algal symbiosis according to claim 4 is characterized by: The stirring assembly comprises a second motor (29), a stirring shaft (30) and a plurality of stirring plates (31). A support plate is fixedly provided on the inner top of the nitrification and denitrification tank (11). The stirring shaft (30) is rotatably provided on the support plate. The second motor (29) is fixedly provided on the top of the support plate. The output end of the second motor (29) is fixedly connected to the top of the stirring shaft (30) through a coupling. The plurality of stirring plates (31) are equidistantly provided on the outer wall of the stirring shaft (30). The outer wall of each stirring plate (31) is provided with a plurality of stirring holes (32).

6. The highly efficient system for treating livestock and poultry breeding wastewater using bacterial and algal symbiosis according to claim 5 is characterized by: A sealing cover (33) is provided on the top of the anaerobic tank (4).

7. The highly efficient system for treating livestock and poultry breeding wastewater using bacterial and algal symbiosis according to claim 6, characterized in that: The inner bottom of the oxidation pond (5) is paved with an impermeable membrane (34), and a plurality of culture containers (35) are arranged at equal intervals on the top of the impermeable membrane (34).

Images