System for efficiently treating livestock and poultry breeding sewage by utilizing algal-bacterial symbiosis

Abstract

The invention relates to the technical field of sewage treatment, in particular to a system for efficiently treating livestock and poultry breeding sewage by utilizing algal-bacterial symbiosis, which 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 assembly is arranged in the nitrification and denitrification tank; the chemical phosphorus removal module comprises a coagulation, flocculation and sedimentation tank and a stirring assembly, the coagulation, flocculation and sedimentation tank is arranged on the ground, and the stirring assembly is arranged in a coagulation and flocculation area in the coagulation, flocculation and sedimentation tank; according to the system for efficiently treating the livestock and poultry breeding sewage by utilizing the bacterial-algae symbiosis, compared with an existing method for removing the total nitrogen content in the sewage by independently utilizing microorganisms, pollutants in the sewage are synergistically removed in the oxidation pond by utilizing a bacterial-algae symbiosis structure, microalgae and bacteria, so that the energy consumption and the carbon source are saved, and the environmental pollution is reduced. Meanwhile, the sewage treatment effect is improved.

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 has the characteristics of high COD and high ammonia nitrogen, among which COD can reach more than 20,000 mg / L, ammonia nitrogen can reach more than 2,000 mg / L, and total phosphorus concentration is about 300 mg / L. The commonly used livestock and poultry wastewater treatment process is solid-liquid separation-anaerobic-biological denitrification and phosphorus removal-chemical phosphorus removal-disinfection of effluent. Among them, the biological denitrification and phosphorus removal process is mainly a two-stage AO full-process nitrification and denitrification process, as well as a new integrated short-range nitrification and denitrification process. These processes all use bacterial metabolism to remove pollutants, with long hydraulic retention time, high energy consumption, poor phosphorus removal effect, and even less than 50% biological treatment effect. According to the latest research, combining microalgae and bacteria to construct a "bacteria-algae symbiosis" sewage treatment system can greatly improve the removal effect of COD, ammonia nitrogen and total phosphorus in water, among which the removal effect of total phosphorus can reach more than 80%, which has the advantages of saving energy consumption and reducing the amount of chemical dephosphorization agents at the back end. 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 shortcomings:

[0004] 1. The treatment method is relatively simple and wastes resources. Using microbial means alone to remove the total nitrogen content in sewage is to convert Kjeldahl nitrogen and oxidized nitrogen into nitrogen gas through biological oxidation and reduction reactions and release 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 the 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 reduced to nitrogen gas and released into the air by carbon sources under the action of denitrifying bacteria. If a higher total nitrogen removal rate is to be achieved, it is often necessary to add additional carbon sources, which requires a large amount of carbon sources.

[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 bacteria and algae symbiosis.

[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 bacteria and algae symbiosis, comprising a solid-liquid separation module arranged on the ground, the solid-liquid separation module comprising a water inlet pipe, a separation box and a filter basket, the separation box being arranged on the ground, the water inlet pipe being fixedly arranged at one end of the top of the separation box, and the filter basket being inserted inside the separation box; further comprising 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 arranged beside the oxidation pond. The micro-aeration module includes an aeration component, an adjustment component, a plurality of aeration tubes and a plurality of inner tubes. The plurality of aeration tubes are arranged at equal intervals inside the oxidation pond through two lapped frames. Each inner tube is arranged inside an aeration tube by rotating through two rotating shafts. The aeration component is arranged between the ground and the plurality of inner tubes, and the adjustment component is arranged between the plurality of rotating shafts.

[0013] The nitrification and denitrification module is arranged beside 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 arranged on the top of the ground. The stirring assembly is arranged inside the nitrification and denitrification tank. A fixing frame is fixed inside the secondary sedimentation tank. A central guide tube is fixed in the fixing frame. An overflow weir is fixed on the inner wall of the peripheral side 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. An overflow weir, a fixed frame and a central guide tube are also provided inside the final sedimentation tank. Agitators are fixed inside the coagulation tank and the flocculation tank.

[0015] Furthermore: the inflation component includes an air pump, a dispersion pipe and a plurality of 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 the plurality of 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, 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 a second aeration hole, each first aeration hole is smaller than an avoidance hole, and the axial directions of each avoidance hole, each first aeration hole and one second aeration hole are consistent.

[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, and 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 pool, 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, a slot for inserting a filter basket is provided on the side wall of the separation box, two baffles are symmetrically arranged 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 plurality 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 a plurality of 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. The output end of the second motor is fixedly connected to the top of the stirring shaft through a coupling. A plurality of stirring plates are equidistantly arranged on the outer wall of the stirring shaft. A plurality of stirring holes are arranged on the outer wall of each stirring plate.

[0022] Further: 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 to remove pollutants in sewage in the oxidation pond. Compared with the existing method of removing the total nitrogen content in sewage by microbial means alone, it saves energy consumption and carbon source, 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, which creates favorable conditions for the next step of deep nitrification, denitrification and denitrification, accelerates the rate of sewage treatment, and makes sewage treatment more efficient.

[0026] 2. The present invention can make the sewage in a relatively mixed state by designing a micro-aeration module, so that the microalgae can 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 provide biological denitrification processes such as synchronous nitrification and denitrification, short-range nitrification and denitrification, and provide a suitable environment for the growth of "bacteria-algae symbiosis" biological groups.

[0027] 3. The present invention forms a bacterial floc with a large amount of microalgae attached to it by inoculating chlorella species and anaerobic aerobic species, as bacteria and microalgae gradually grow. This combined bacterial floc plays a major role in degrading pollutants in the "bacteria-algae symbiosis" system. In this system, chlorella fixes nitrogen and phosphorus in water through photosynthesis, reduces the nitrogen and phosphorus concentration of water, and releases oxygen to supply bacteria. In the process of their own metabolism, bacteria will consume oxygen from photosynthesis and release carbon dioxide concentration required for microalgae growth, thereby promoting algae growth enhancement. In addition, part of the dead microalgae can provide soluble organic carbon for bacterial growth, improve the carbon-nitrogen ratio of water, and provide a carbon source for bacteria to further denitrify. A large number of studies have shown that the "bacteria-algae symbiosis" method is better than the single use of the same biomass microorganisms to decompose pollutants, and the oxygen produced by microalgae greatly reduces the total amount of additional oxygen supply, while reducing the demand for microbial denitrification to add carbon sources. Microalgae fix nitrogen and phosphorus pollutants in water in themselves, achieving the capture of nitrogen and phosphorus. 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 can flexibly adjust the amount of aeration inside the oxidation pond according to the degree of sewage pollution by designing an adjustment component, thereby adjusting the proportion of dissolved oxygen inside the oxidation pond and changing the anoxic environment of the sewage, so that bacteria can 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 can prevent the generated bacteria and microalgae from growing underground and prevent groundwater from penetrating into the oxidation pond by designing an impermeable membrane, which is beneficial to improving the degradation efficiency of the combined bacterial flocs on pollutants. Several culture vessels 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 a major role in degrading pollutants in the "bacteria-algae symbiosis" system. The design of the equal spacing of the several culture vessels is to ensure that the Chlorella species and the 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 without causing omissions, thereby improving the uniformity of pollutant degradation inside the oxidation pond.

[0030] 6. The present invention designs 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 whole 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, and 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, and several stirring holes can improve the stirring efficiency to adjust the dissolved oxygen content inside the nitrification reaction tank, so that the nitrogen-containing substances in the sewage are in a nitrification state, and 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 sludge intercepted by the secondary sedimentation tank, and the partially intercepted sludge is returned to the nitrification and denitrification reaction tank to maintain the sludge amount in 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 in the effluent is required to be below 1 mg / L. Therefore, the present invention designs a chemical phosphorus removal module, and chemical phosphorus removal is achieved by adding chemical phosphorus removal agents through coagulation and flocculation. The effluent is discharged after sedimentation and disinfection. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings in the embodiment of the present invention are briefly introduced below.

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

[0034] Figure 2 for Figure 1 A in the enlarged view;

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

[0036] Figure 4 for Figure 3 The enlarged view of point B in the figure;

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

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

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

[0040] Figure 8 It is a schematic diagram of the cross-sectional structure of the separation box of the present invention;

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

[0042] Fig.10 It is a schematic diagram of the three-dimensional structure of the chemical phosphorus removal module of the present invention;

[0043] Fig.11 It is the overall flow chart of the present invention.

[0044] In the figure: 1, water inlet pipe; 2, separation box; 3, filter basket; 4, anaerobic tank; 5, oxidation pond; 6, first discharge pipe; 7, aeration pipe; 8, inner pipe; 9, lap frame; 10, rotating shaft; 11, nitrification and denitrification tank; 12, air pump; 13, dispersion pipe; 14, conveying pipe; 15, first motor; 16, chain; 17, sprocket; 18, avoidance hole; 19, first aeration hole; 20, second aeration hole; 21, water suction pump; 22, water extraction pipe; 2 3. Water supply pipe; 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. Impermeable membrane; 35. Cultivator; 36. Second 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 is 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 will be omitted, enlarged or reduced, and do not represent the size of the actual product.

[0047] Reference Figures 1 to 9 As shown, a highly efficient system for treating livestock and poultry wastewater by using bacteria and algae symbiosis includes a solid-liquid separation module arranged 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 arranged on the ground, the water inlet pipe 1 is fixedly arranged at 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; it 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 the first discharge pipe 6. 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 removing total nitrogen by microorganisms alone, it is more efficient and saves energy and carbon sources. It has been verified by experiments that 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 respectively consume the oxygen for photosynthesis and release the carbon dioxide concentration required for the growth of microalgae, thereby promoting the growth of algae. In addition, some dead microalgae can provide dissolved organic carbon for bacterial growth and improve 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 arranged beside the oxidation pond 5, and 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 arranged at equal intervals inside the oxidation pond 5 through two lap frames 9, and each inner tube 8 is arranged inside an aeration tube 7 by rotating through 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.

[0050] 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 sewage after passing through the oxidation pond 5 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. A stirrer 44 is fixed inside the coagulation tank 40 and the flocculation tank 41. 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 stirrer 44. The After reaching full concentration, the sewage treated by the coagulation tank 40 enters the flocculation tank 41, and 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 to form 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 aerator is added to the disinfection tank 43. The water in the disinfection tank 43 is contacted with air through the aerator to form a gas stirring effect, 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 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 evenly spaced and arranged on the outer wall of the dispersion pipe 13. When the sewage is treated by the combined bacterial flocculent, 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 and designed on the outer wall of the dispersion pipe 13. One end of each delivery 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 end of the delivery pipe 14 close to the sprocket 17 is rotatably connected to the rotating shaft 10 close to the sprocket 17. The rotating shafts 10 are all hollow structures, so that the air is transported to the interior of the plurality of inner tubes 8 through the input end, the output end, the dispersion pipe 13 and the plurality of delivery pipes 14 of the air pump 12 in turn. 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 turn, 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, so that the microalgae can fully receive light and promote the growth of microalgae. At the same time, the anoxic environment formed by micro-aeration can provide bacteria with good conditions for denitrification processes such as synchronous nitrification and denitrification, short-range nitrification and denitrification.

[0053] Reference Figures 1 to 9As shown, the adjustment component includes a first motor 15, a chain 16 and a plurality of sprockets 17. The first motor 15 is fixedly arranged on the top of the oxidation pond 5, one of the sprockets 17 is fixedly arranged on its output end, 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. 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. When the micro-aeration efficiency needs to be adjusted, the first motor 15 is started by the controller, and the micro-aeration efficiency is adjusted by the controller. 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 a plurality of rotating shafts 10 close to the chain 16. The plurality of 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, so that the plurality of inner tubes 8 rotate counterclockwise inside the plurality of 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 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 one second aeration hole 20, and each first aeration hole 19 is smaller than one avoidance hole 18, and the axial directions of each avoidance hole 18, each first aeration hole 19 and one second aeration hole 20 are consistent. When each second aeration hole 20 is aligned with one avoidance hole 18, due to the circumferential direction of each inner tube 8 A plurality of first aeration holes 19 and a plurality of second aeration holes 20 are designed on the outer wall at equal intervals, each first aeration hole 19 is larger than a second aeration hole 20, each first aeration hole 19 is smaller than an avoidance hole 18, and the axial directions of each avoidance hole 18, each first aeration hole 19 and one second aeration hole 20 are consistent, 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, and the proportion of dissolved oxygen is adjusted to change the anoxic environment of the sewage and adjust the denitrification efficiency of the sewage.

[0055] Reference Figures 1 to 9As shown, a water suction pump 21 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 pumping pipe 22 and a water delivery pipe 23 are fixedly provided at both ends of the water suction pump 21. 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 preliminarily treats the sewage, the water suction pump 21 located between the anaerobic tank 4 and the oxidation pond 5 is started by the controller, so that the preliminarily treated sewage is input into the oxidation pond 5 through the pumping pipe 22, the water suction pump 21 and the water delivery pipe 23, so that the bacteria-algae symbiotic structure in the oxidation pond 5 can degrade the pollutants in the sewage. After the sewage is treated by the oxidation pond 5, the water suction pump 21 located between the oxidation pond 5 and the nitrification and denitrification tank 11 is started by the controller, and the treated sewage in the oxidation pond 5 is delivered to the nitrification and denitrification tank 11 through the pumping pipe 22, the water suction pump 21 and the water delivery pipe 23.

[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 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 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, a slot for inserting the filter basket 3 is provided on the side wall of the separation box 2, two baffles 26 are symmetrically arranged on the inner wall of the separation box 2, and 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 fixedly provided on the outer wall of one end of the filter basket 3, and a plurality of filter slots 28 are provided on the outer wall of the filter basket 3. When the livestock and poultry breeding sewage is treated, the sewage is discharged into the interior of the separation box 2 through the water inlet pipe 1, and the solids in the sewage are filtered by the plurality of filter slots 28 to the top of the filter basket 3 for temporary storage, and the remaining sewage is ... The water continues to fall into the inner bottom of the separation box 2 through several filter tanks 28 to achieve solid-liquid separation of the sewage. Since the inner bottom of the separation box 2 is a slope structure, 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 large molecular organic matter in the sewage is decomposed into small molecular organic matter through the anaerobic tank 4, and the concentration of organic matter is reduced at the same time, which is convenient for improving 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 arranged on the inner top of the nitrification and denitrification tank 11. The stirring shaft 30 is rotatably arranged on the support plate. The second motor 29 is fixedly arranged on the top of the support plate. Its output end is fixedly connected to the top of the stirring shaft 30 through a coupling. A plurality of stirring plates 31 are arranged on the outer wall of the stirring shaft 30 at equal intervals. A plurality of stirring holes 32 are arranged 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, when the sewage removed of the total nitrogen and organic matter is transported to the The second motor 29 is started by the controller because 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 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 an 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, and the sealing cover 33 is used to cover the top of the anaerobic tank 4 so that the anaerobic tank 4 remains in a closed state. The oxidation pond 5 is mainly used to decompose the macromolecular organic matter in the sewage into small molecular organic matter and reduce the concentration of organic matter. This process does not require oxygen participation, so 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 prevent groundwater from penetrating into the oxidation pond 5, which is beneficial to improving the degradation efficiency of the combined bacterial flocs on pollutants. The several culture vessels 35 are respectively used to inoculate Chlorella species and anaerobic aerobic bacteria species. As the bacteria and microalgae gradually grow, bacterial flocs with a large number of microalgae attached are formed. This combined bacterial floc plays a major role in degrading pollutants in the "bacteria-algae symbiosis" system. The purpose of designing the several culture vessels 35 at equal intervals is to ensure that the Chlorella species and the 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.

[0061] The working principle of the present invention is as follows: when 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, and the solids in the wastewater are filtered by a plurality of filter slots 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 a plurality of filter slots 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, and the wastewater is initially treated. Specifically, the macromolecular organic matter in the wastewater is decomposed into small molecular organic matter through the anaerobic tank 4, and the concentration of organic matter is reduced at the same time, so as to facilitate 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 macromolecular 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] 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 controller starts the water suction pump 21 located between the anaerobic tank 4 and the oxidation pond 5, so that the sewage after the preliminary treatment is input into the oxidation pond 5 through the suction pipe 22, the water suction pump 21 and the water delivery pipe 23, so as to facilitate the bacteria-algae symbiotic structure inside the oxidation pond 5 to degrade the pollutants in the sewage.

[0064] The impermeable membrane 34 can prevent the generated bacteria and microalgae from growing underground, and 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, will not cause omissions, and improve the uniformity of pollutant degradation inside the oxidation pond 5.

[0065] While 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, a plurality of conveying pipes 14 are designed at equal intervals on the outer wall of the dispersion pipe 13. 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. Each rotating shaft 10 close to the sprocket 17 is a hollow structure, so that the air is sequentially conveyed to the interior of the plurality of inner tubes 8 through the input end, the output end, the dispersion pipe 13 and the plurality of conveying pipes 14 of the air pump 12. 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 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, so that the microalgae can fully receive light and promote the growth of the microalgae. At the same time, the anoxic environment formed by micro-aeration can provide bacteria with good conditions for denitrification processes such as synchronous 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 a number of rotating shafts 10 close to the chain 16, and a number of 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, 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 equally spaced on the outer wall in the circumferential direction of each inner tube 8, each first aeration hole 19 is larger than a second aeration hole 20, and each first aeration hole 19 is smaller than an avoidance hole 18, the axial directions of each avoidance hole 18, each first aeration hole 19 and one second aeration hole 20 are consistent, 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, and the proportion of dissolved oxygen is adjusted to change the anoxic environment of the sewage, thereby further achieving 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 21 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 pumping pipe 22, the water suction pump 21 and the water delivery pipe 23.

[0069] After the total nitrogen and organic matter in the sewage are removed by the bacteria-algae symbiotic system, when the sewage with the 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 a plurality of stirring plates 31 are fixedly connected to the rotating shaft 10, thereby driving the plurality of stirring plates 31 to rotate. A 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 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 stirring and mixing of the mixer 44 is fully achieved, and 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 water in the disinfection tank 43 is contacted with air through the aerator to form a gas stirring effect, thereby making the disinfection effect better.

Claims

1. A highly efficient system for treating livestock and poultry wastewater by using bacteria and algae symbiosis, comprising a solid-liquid separation module arranged 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 arranged on the ground, the water inlet pipe (1) being fixedly arranged 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 (6), 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 lapped frames (9), and each inner tube (8) is rotatably arranged inside an aeration tube (7) 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), and comprises 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, and 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), and 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), and comprises 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), and a stirrer (44) is fixed inside the coagulation tank (40) and the flocculation tank (41).

2. According to claim 1, a highly efficient system for treating livestock and poultry breeding wastewater by using bacteria and algae symbiosis, characterized in that: 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.

3. The system for treating livestock and poultry breeding wastewater by utilizing bacterial and algal symbiosis according to claim 2 is characterized in that: The regulating assembly comprises a first motor (15), a chain (16) and a plurality of sprockets (17). The first motor (15) is fixedly arranged on the top of the oxidation pond (5), one of the sprockets (17) is fixedly arranged on its output end, another of the sprockets (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.

4. The system for treating livestock and poultry breeding wastewater by utilizing bacterial and algal symbiosis according to claim 3 is characterized by: A plurality of avoidance holes (18) are evenly spaced on the outer wall in the circumferential direction of each aeration tube (7); 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 a second aeration hole (20); each first aeration hole (19) is smaller than a avoidance hole (18); and the axial directions of each avoidance hole (18), each first aeration hole (19) and a second aeration hole (20) are consistent.

5. The system for treating livestock and poultry wastewater by utilizing bacterial and algal symbiosis according to claim 4 is characterized in that: A water suction pump (21) 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), and a water suction pipe (22) and a water delivery pipe (23) are fixedly provided at both ends of the water suction pump (21).

6. The system for treating livestock and poultry wastewater by utilizing bacterial and algal symbiosis according to claim 5 is characterized by: A second discharge pipe (24) is also fixedly provided on the outer wall of the nitrification and denitrification pool (11), and a solenoid valve (25) is fixedly provided on the outer wall of the second discharge pipe (24).

7. The system for treating livestock and poultry breeding wastewater by utilizing bacterial and algal symbiosis according to claim 6 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), and a plurality of filter grooves (28) are provided on the outer wall of the filter basket (3).

8. The system for treating livestock and poultry breeding wastewater by utilizing bacterial and algal symbiosis according to claim 7 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 arranged on the inner top of the nitrification and denitrification tank (11). The stirring shaft (30) is rotatably arranged on the support plate. The second motor (29) is fixedly arranged 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 arranged at equal intervals 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).

9. The system for treating livestock and poultry wastewater by using bacteria-algae symbiosis according to claim 8 is characterized by: A sealing cover (33) is provided on the top of the anaerobic tank (4).

10. The system for treating livestock and poultry breeding wastewater by utilizing bacterial and algal symbiosis according to claim 9 is 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