High-concentration ammonia nitrogen rural domestic sewage treatment system

Abstract

The invention relates to the technical field of sewage treatment, and provides a high-concentration ammonia nitrogen rural domestic sewage treatment system, which comprises an adjusting tank, a sewage basic treatment device, a sewage enhanced treatment device, an aeration device and a bacteria inactivation device, the sewage basic treatment device comprises an anaerobic tank, an anoxic tank, an aerobic tank and a sedimentation tank which are sequentially communicated, a first sludge return pipe is communicated between the anaerobic tank and the sedimentation tank, and a second sludge return pipe is communicated between the aerobic tank and the anoxic tank; the sewage enhanced treatment equipment is communicated between the sewage basic treatment equipment and the adjusting tank, the sewage enhanced treatment equipment comprises a biochemical tank, and an aerobic tank and an anoxic tank which are arranged in the biochemical tank, and the aerobic tank and the anoxic tank are communicated with each other; the aeration equipment is used for aerating the anoxic tank, the aerobic tank, the anoxic tank and the aerobic tank; the bacteria inactivation equipment is used for inactivating nitrifying bacteria in the second sludge return pipe. According to the invention, ammonia nitrogen in sewage can be efficiently removed, and the denitrification efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of sewage treatment, and in particular to a rural domestic sewage treatment system with high concentration of ammonia nitrogen. Background Art

[0002] In recent years, some new denitrification processes have emerged at home and abroad, providing new ways to treat high-concentration ammonia nitrogen wastewater. They mainly include short-range nitrification and denitrification, aerobic denitrification and anaerobic ammonia oxidation, high-concentration activated sludge, high-efficiency filler treatment, and high-efficiency mud-water separation.

[0003] With the rapid development of rural economy and the continuous improvement of people's living standards, the concentration of ammonia nitrogen in domestic sewage discharged by residents has become higher and higher, reaching 60-70mg / l. It is far beyond the design standard of existing conventional domestic sewage treatment plants (30-40mg / l). As a result, the ammonia nitrogen in the effluent of most sewage treatment plants exceeds the standard, and the effluent water quality does not meet the standard when discharged into the receiving water body, causing eutrophication of the water body and failing to achieve the goal of repairing and protecting the water environment. Therefore, it is urgent to develop and promote technologies that can be widely used in the treatment of rural domestic sewage with high concentration of ammonia nitrogen. Summary of the invention

[0004] In order to efficiently remove ammonia nitrogen from sewage, improve denitrification efficiency, and ensure that the effluent is stable and meets the standards, the present application provides a high-concentration ammonia nitrogen rural domestic sewage treatment system.

[0005] The present application provides a high-concentration ammonia nitrogen rural domestic sewage treatment system, which adopts the following technical solution: A high-concentration ammonia nitrogen rural domestic sewage treatment system, comprising: Regulating pool, A basic sewage treatment equipment is connected to the regulating tank, comprising an anaerobic tank, an anoxic tank, an aerobic tank and a sedimentation tank connected in sequence, wherein a first sludge return pipe is connected between the anaerobic tank and the sedimentation tank, a second sludge return pipe is connected between the aerobic tank and the anoxic tank, a first driving source is provided on the first sludge return pipe, and a second driving source is provided on the second sludge return pipe, the first driving source is used to drive the fluid in the first sludge return pipe to flow into the anaerobic tank, and the second driving source is used to drive the fluid in the second sludge return pipe to flow into the anoxic tank; A sewage enhanced treatment device is connected between the sewage basic treatment device and the regulating tank, and the sewage enhanced treatment device includes a biochemical tank, an aerobic tank and an anaerobic tank arranged in the biochemical tank, and the aerobic tank and the anaerobic tank are connected to each other; Aeration equipment, used for aerating the anoxic tank, aerobic tank, anoxic box and aerobic box; The bacteria inactivation equipment is used for inactivating the nitrifying bacteria in the second sludge return pipe.

[0006] By adopting the above technical scheme, the regulating tank is used to balance the water quality and quantity to avoid the normal operation of the subsequent treatment units affected by the fluctuation of the influent; the sewage strengthening equipment is connected between the sewage basic treatment equipment and the regulating tank to perform preliminary ammonia nitrogen removal on the sewage discharged from the regulating tank to reduce the ammonia nitrogen content in the high-concentration ammonia nitrogen sewage; the setting of the anaerobic tank, anoxic tank, aerobic tank and sedimentation tank in the sewage basic treatment equipment realizes the multi-stage treatment of sewage and effectively improves the removal rate of ammonia nitrogen; the setting of the first sludge return pipe and the second sludge return pipe, as well as the corresponding first driving source and the second driving source, can effectively The sludge in the sedimentation tank is returned to the anaerobic tank, and the sludge in the aerobic tank is returned to the anoxic tank, which enhances the system's sludge recycling capacity and further improves the treatment effect; the aeration equipment aerates the anoxic tank and the aerobic tank to increase the dissolved oxygen content in the aerobic tank, which helps maintain the activity of microorganisms, and mixes and stirs the anoxic tank so that the activated sludge in the anoxic tank is fully mixed with the microorganisms, promoting the decomposition of organic matter and ammonia nitrogen; the bacterial inactivation equipment inactivates the nitrifying bacteria in the second sludge return pipe to prevent nitrifying bacteria from entering the anoxic tank and interfering with the denitrification process, thereby ensuring the stability of the system and treatment efficiency.

[0007] Optionally, the aeration equipment includes a gas transporter and an aeration network pipe connected to the gas transporter, and the aerobic tank, the anoxic tank, the aerobic box and the anoxic box are all provided with an aeration network pipe.

[0008] By adopting the above technical solution, aeration of the anoxic tank, aerobic tank, aerobic box and anoxic box is achieved by setting up gas transporters and aeration network pipes, which can ensure the dissolved oxygen content and the mixing intensity of activated sludge and microorganisms in each area, meet the growth needs of microorganisms, and improve the biological treatment effect.

[0009] Optionally, it also includes a dosing module, which includes a dosing tank, a dosing pump and a drug delivery tube connected to the dosing tank, one end of the drug delivery tube is connected to the biochemical pool, and the dosing pump is used to drive the liquid in the drug delivery tube to move into the biochemical pool.

[0010] By adopting the above technical solution, the dephosphorization agent is added into the dosing tank, and the dosing pump and the drug delivery tube transport the agent to the biochemical pool, which can not only perform chemical dephosphorization, but also increase the concentration of suspended solids to maintain high-concentration activated sludge in the biochemical pool. The setting of the dosing module can also reduce manual operations, improve the automation level of the system, and further ensure the stability and reliability of the treatment process.

[0011] Optionally, a first agitator is provided on the dosing tank.

[0012] By adopting the above technical solution, the first agitator can evenly mix the dephosphorization agent in the dosing tank, ensure that the effective ingredients of the agent are fully dissolved, improve the use efficiency of the agent, thereby better achieving the removal of pollutants in the sewage and enhancing the overall treatment effect of the sewage treatment system.

[0013] Optionally, a three-phase separator is provided in the biochemical pool, and the three-phase separator includes a separator body and an inlet pipe and an outlet pipe connected to the separator body, and an aeration network pipe is also provided below the inlet pipe; the outlet pipe is connected to a clean water tank.

[0014] By adopting the above technical solution, the three-phase separator can effectively separate the solid, liquid and gas phases, ensuring that the suspended matter in the sedimentation tank is effectively removed. At the same time, the aeration network drives the mud-water mixture in the biochemical pool along the water inlet pipe into the separator body. The setting of the clear water tank is convenient for collecting the treated clear water to ensure that the effluent water quality meets the discharge standards.

[0015] Optionally, the bacteria inactivation equipment includes a heating cylinder section connected to the second sludge return pipe section, a heating pipe is arranged outside the heating cylinder section, and the heating pipe is spirally wound outside the heating cylinder, and a thermometer is arranged on the heating pipe.

[0016] By adopting the above technical solution, the nitrifying bacteria in the second sludge return pipe can be effectively inactivated, preventing the nitrifying bacteria from entering the anoxic tank and affecting the denitrification process, thereby improving the denitrification efficiency of the system. The spiral heating tube design increases the heat transfer area, improves the heating efficiency, and ensures uniform heating. The thermometer monitors the temperature in real time to ensure the safety and stability of the heating process.

[0017] Optionally, a second agitator is provided on the heating cylinder section.

[0018] By adopting the above technical solution, the setting of the first agitator can effectively promote uniform mixing in the heating cylinder section, ensure that nitrifying bacteria are evenly heated during the high-temperature inactivation process, improve the inactivation efficiency, and prevent local overheating or incomplete inactivation, thereby ensuring the stable operation of the sewage treatment system and the effluent quality.

[0019] Optionally, the aeration device further includes an air intake main pipe and an air intake branch pipe connected to the air intake main pipe, the air intake main pipe is connected to the gas transporter, a plurality of air intake branch pipes are provided, and the air intake branch pipes are connected to the aeration network pipes in a one-to-one correspondence; The air intake branch pipe is connected with a dilution air pipe, and both the air intake branch pipe and the dilution air pipe are provided with proportional regulating valves, and both the anoxic tank and the aerobic tank are provided with dissolved oxygen detectors.

[0020] By adopting the above technical solution, the aeration volume can be accurately controlled to ensure that the dissolved oxygen concentration in the anoxic tank and the aerobic tank is maintained within an appropriate range, thereby optimizing the growth environment of microorganisms and improving the denitrification efficiency. The dilution air pipe is used to introduce non-oxygen gases such as rare gases. The setting of the dilution air pipe and the proportional control valve can flexibly adjust the oxygen content in the gas during aeration to ensure the aeration needs at different stages. The real-time monitoring function of the dissolved oxygen detector further ensures the stability and reliability of the system.

[0021] Optionally, a sludge tank is also included, and the sedimentation tank is connected to the sludge tank.

[0022] By adopting the above technical solution, the residual sludge generated in the sedimentation tank can be effectively collected and treated, avoiding sludge accumulation affecting the normal operation of the sewage treatment system, and facilitating the subsequent centralized treatment and resource utilization of sludge.

[0023] Optionally, it also includes a lifting well, in which a lifting pump is arranged, the lifting pump is connected to a material delivery pipe, one end of the material delivery pipe is connected to the regulating tank, and the lifting pump is used to transport the fluid in the lifting well to the regulating tank.

[0024] By adopting the above technical solution, the system can automatically transport the fluid in the lifting well to the regulating tank, thereby improving the automation level and operating efficiency of the entire system, ensuring the stability and reliability of the fluid transmission process, and reducing the need for manual operation.

[0025] In summary, the present application includes at least one of the following beneficial effects: 1. By setting up anaerobic tanks, anoxic tanks, aerobic tanks and sedimentation tanks, and equipping the first sludge return pipe and the second sludge return pipe, efficient ammonia nitrogen removal is achieved. The first driving source and the second driving source drive the sludge return respectively, ensuring the effective recycling of the sludge, thereby improving the denitrification efficiency and stability of the system; 2. The aeration equipment aerates the anoxic pool and the aerobic pool, ensuring the oxygen supply for the microorganisms in each pool, promoting the smooth progress of the nitrification and denitrification process, and further improving the removal effect of ammonia nitrogen; 3. The bacteria inactivation equipment inactivates the nitrifying bacteria in the second sludge return pipe, avoiding the excessive reproduction of nitrifying bacteria in the anoxic tank, reducing unnecessary energy consumption, and preventing the accumulation of nitrates, thus ensuring the long-term stable operation of the system; 4. High-concentration ammonia nitrogen rural domestic sewage treatment process, removes organic pollutants, etc., to avoid heterotrophic bacteria competing on the surface of the filler to affect the growth and enrichment of nitrifying bacteria; the filler has a large effective specific surface area, large biomass, and high treatment efficiency. The vertical plane design maximizes the use of hydraulic shear, controls the thickness of the biofilm within the efficient range, and accelerates the shedding of anaerobic biofilm; 5. Due to the presence of activated sludge, the phosphorus removal agent will not gather, cover and wrap the biological filler. At the same time, since it does not rely on the treatment efficiency of activated sludge, the phosphorus removal agent can be directly added to the biochemical pool, which is simple to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the overall structure of a high-concentration ammonia nitrogen rural domestic sewage treatment system according to Example 1 of the present application; Figure 2 is a partial structural schematic diagram of a sewage enhanced treatment device according to Example 1 of the present application; Figure 3 This is a partial structural schematic diagram of a basic sewage treatment device according to Example 2 of the present application; Explanation of reference numerals: 1. regulating tank; 11. submersible pump; 12. first material transport pipe; 13. flow meter; 14. first manual butterfly valve; 15. second material transport pipe; 2. basic sewage treatment equipment; 21. anaerobic tank; 22. anoxic tank; 23. aerobic tank; 24. sedimentation tank; 25. first sludge return pipe; 26. second sludge return pipe; 27. first driving source; 28. second driving source; 29. ​​second overflow pipe; 3. sewage enhanced treatment equipment; 31. biochemical tank; 32. aerobic box; 33. anoxic box; 34. first overflow pipe; 4. aeration equipment; 41. gas transporter; 42. aeration network pipe; 43. air intake main pipe; 44. air intake branch pipe; 45. 4. Dilution air pipe; 45. Proportional regulating valve; 46. Dissolved oxygen detector; 47. Flow control valve; 5. Bacteria inactivation equipment; 51. Heating cylinder section; 52. Heating tube; 53. Thermometer; 54. Second agitator; 6. Dosing module; 61. Dosing tank; 62. Dosing pump; 63. Drug delivery pipe; 64. First agitator; 7. Three-phase separator; 71. Separator body; 72. Water inlet pipe; 73. Water outlet pipe; 74. Third sludge return pipe; 75. Return branch pipe; 751. Check valve; 8. Sludge tank; 81. Sludge discharge pipe; 82. Electric butterfly valve; 83. Second manual butterfly valve; 9. Lifting well; 91. Lifting pump; 92. Delivery pipe; 10. Clean water tank. DETAILED DESCRIPTION

[0027] The following is combined with Figure 1-Figure 3 This application is described in further detail.

[0028] Embodiment 1:

[0029] Example 1 of the present application provides a high-concentration ammonia nitrogen rural domestic sewage treatment system.

[0030] Reference Figure 1A high-concentration ammonia nitrogen rural domestic sewage treatment system includes a lifting well 9, a regulating tank 1, a sewage basic treatment equipment 2 and a clear water tank 10 connected in sequence, and a sewage enhanced treatment equipment 3 is also connected between the regulating tank 1 and the sewage basic treatment equipment 2. A lifting pump 91 is installed at the bottom of the lifting well 9, and the input end of the lifting pump 91 is connected to the lifting well 9. The lifting pump 91 is connected to a feed pipe 92; the end of the feed pipe 92 away from the lifting pump 91 is connected to the regulating tank 1, and a check valve 751 is installed on the feed pipe 92. The lifting pump 91 is used to transport the domestic sewage in the lifting well 9 to the regulating tank 1. The lifting pump 91 can be a centrifugal pump. The regulating tank 1 is used to adjust the flow and water quality of the sewage to ensure that the sewage parameters entering the sewage basic treatment equipment 2 are stable.

[0031] Reference Figure 1 , the sewage enhanced treatment equipment 3 is connected between the sewage basic treatment equipment 2 and the regulating tank 1, and the sewage enhanced treatment equipment 3 includes a biochemical tank 31, an aerobic box 32 and an anoxic box 33 arranged in the biochemical tank 31. The aerobic box 32 and the anoxic box 33 are connected to each other, the anoxic box 33 is connected to the biochemical tank 31, and the aerobic box 32 is filled with nitrification filler. A submersible pump 11 is installed in the regulating tank 1, and the submersible pump 11 is connected to the first material transport pipe 12; the input end of the submersible pump 11 is connected to the regulating tank 1, and a check valve 751 is installed on the first material transport pipe 12, and the end of the first material transport pipe 12 away from the submersible pump 11 is connected to the aerobic box 32. Start the submersible pump 11, and the sewage in the regulating tank 1 can be transported to the aerobic box 32. The pipe section of the first material transport pipe 12 is also installed with a flow meter 13 and a first manual butterfly valve 14 at intervals. In this embodiment, two submersible pumps 11 are specifically provided.

[0032] The combination of sewage enhanced treatment equipment 3 and high-efficiency nitrification filler, based on the performance of multi-stage AO process, is supplemented by high-efficiency nitrification filler with a specific surface area of ​​up to 6000㎡ / m', to achieve high ammonia nitrogen removal effect, stable system operation, strong impact load resistance, and simple operation and maintenance. At the same time, high-concentration activated sludge is used to provide a stable strain concentration for the biofilm system in the biochemical pool 31, enhance treatment performance, and improve treatment efficiency.

[0033] Reference Figure 1 and Figure 2 A three-phase separator 7 is also provided in the biochemical pool 31. The three-phase separator 7 includes a separator body 71 and an inlet pipe 72, an outlet pipe 73 and a third sludge return pipe 74 connected to the separator body 71. The inlet pipe 72 is located at the bottom of the separator body 71, and one end of the outlet pipe 73 is connected to the clean water pool 10; the third sludge return pipe 74 is connected to two return branches 75, one return branch 75 is connected to the aerobic tank 32, and the other return branch 75 is connected to the anoxic tank 33, and both return branches 75 are installed with a check valve 751.

[0034] Reference Figure 1 and Figure 2 , the dissolved oxygen in the aerobic box 32 needs to be controlled at 2-3 mg / L, and the dissolved oxygen in the anoxic box 33 needs to be controlled at 0.2-0.5 mg / L. In order to ensure the dissolved oxygen content in the aerobic box 32 and the anoxic box 33, an aeration device 4 is also provided. The aeration device 4 includes a gas transporter 41, an air intake main pipe 43 connected to the gas transporter 41, and the air intake main pipe 43 is connected to a plurality of air intake branches 431, each of which is connected to an aeration network pipe 42, and a flow control valve 47 is installed on each air intake branch pipe 431 to control the air intake volume of each air intake branch pipe 431. The aeration network pipe 42 is provided in the aerobic box 32 and the anoxic box 33. In this embodiment, the gas transporter 41 is specifically configured as a blower. By starting the gas transporter 41, the compressed air can be transported to the aeration network pipe 42 for aeration treatment.

[0035] The aeration network pipe 42 is also arranged below the water inlet pipe 72, which can stir the water below the water inlet pipe 72, prevent sludge from settling, and promote sewage to enter the three-phase separator 7 to participate in solid-liquid separation.

[0036] Reference Figure 1 In order to maintain the activity of the sludge in the biochemical pool 31, a dosing module 6 is also provided. The dosing module 6 includes a dosing tank 61, a dosing pump 62 and a drug delivery pipe 63 connected to the dosing tank 61, and one end of the drug delivery pipe 63 is connected to the biochemical pool 31. It is necessary to add a dephosphorization agent and water into the dosing tank 61. A first agitator 64 is also installed on the dosing tank 61, and the stirring end of the first agitator 64 is located in the dosing tank 61. After adding the dephosphorization agent and water, start the first agitator 64 to ensure that the dephosphorization agent and water in the dosing tank 61 are evenly mixed. Start the dosing pump 62 to allow the liquid in the dosing tank 61 to flow along the liquid in the drug delivery pipe 63 toward the biochemical pool 31, and perform chemical dephosphorization in the biochemical pool 31 to increase the suspended solids concentration of the sewage in the chemical pool. More effectively remove suspended matter in the wastewater, thereby improving the transparency of the sewage in the biochemical pool 31. In this embodiment, the dosing module 6 is specifically provided with two groups.

[0037] Reference Figure 1The basic sewage treatment equipment 2 includes an anaerobic tank 21, an anoxic tank 22, an aerobic tank 23 and a sedimentation tank 24 which are connected in sequence. The submersible pump 11 is also connected to a second material transport pipe 15, and a check valve 751 is also installed on the second material transport pipe 15. The end of the second material transport pipe 15 away from the submersible pump 11 is connected to the anaerobic tank 21. The anoxic tank 22 and the aerobic tank 23 are also connected to an aeration network pipe 42 through an air intake branch pipe 431. The upper end of the biochemical tank 31 is connected to a first overflow pipe 34, and one end of the first overflow pipe 34 is connected to the anaerobic tank 21. When the check valve 751 on the first material transport pipe 12 is closed, the check valve 751 on the second material transport pipe 15 is started, and the submersible pump 11 is started, the sewage in the regulating tank 1 can be directly transported to the basic sewage treatment equipment 2 for purification. At the same time, the check valves 751 on the first material transport pipe 12 and the second material transport pipe 15 are opened, and the sewage in the regulating tank 1 first flows through the sewage enhanced treatment equipment 3 for purification, and then enters the sewage basic treatment equipment 2 along the first overflow pipe 34 for the second treatment.

[0038] Reference Figure 1 , a first sludge return pipe 25 is connected between the anaerobic tank 21 and the sedimentation tank 24, and a second sludge return pipe 26 is connected between the aerobic tank 23 and the anoxic tank 22; a first driving source 27 is provided on the first sludge return pipe 25, and a second driving source 28 is provided on the second sludge return pipe 26. In this embodiment, the first driving source 27 and the second driving source 28 are both configured as reflux pumps. Starting the first driving source 27 can drive the sludge in the sedimentation tank 24 to flow back to the anaerobic tank 21 along the first sludge return pipe 25, and starting the second driving source 28 can drive the sludge in the aerobic tank 23 to flow to the anoxic tank 22 along the second sludge return pipe 26. A second overflow pipe 29 is connected to the upper end of the sedimentation tank 24, and the second overflow pipe 29 is connected to the clean water tank 10, so that the clear liquid overflowing from the sedimentation tank 24 enters the clean water tank 10.

[0039] Reference Figure 1 A sludge pool 8 is also provided on one side of the clear water pool 10, and the bottom of the sedimentation pool 24 is connected to the sludge pool 8. A sludge discharge pipe 81 is connected to the bottom of the biochemical pool 31, and one end of the sludge discharge pipe 81 is connected to the sludge pool 8. An electric butterfly valve 82 and a second manual butterfly valve 83 are also installed on the sludge discharge pipe 81. The material of the sludge pool 8 can be concrete or stainless steel. A sludge thickener can be set in the sludge pool 8 to concentrate the sludge, reduce the sludge volume, and reduce the subsequent treatment cost.

[0040] The implementation principle of this embodiment is as follows: when treating high-concentration ammonia nitrogen sewage, the check valves 751 on the first material transport pipe 12 and the second material transport pipe 15 are opened at the same time. The lifting pump 91 is started, so that the sewage in the lifting well 9 flows to the regulating tank 1 and the anoxic tank 33 in turn, and the first denitrification is carried out in the anoxic tank 33 to reduce nitrite and nitrate to nitrogen gas; then it continues to flow to the aerobic tank 32, and the aerobic tank 23 converts ammonia nitrogen into nitrite and nitrate through nitrification, and finally flows to the bottom of the three-phase separator 7. The sewage below the three-phase separator 7 enters the separator body 71 along the water inlet pipe 72, and the clear liquid obtained after separation enters the clear water tank 10. The sewage overflowing from the biochemical tank 31 enters the anaerobic tank 21, the anoxic tank 22, the aerobic tank 23 and the sedimentation tank 24 of the basic sewage treatment equipment 2 in turn along the first overflow pipe 34. The anaerobic tank 21 converts part of the ammonia nitrogen into nitrogen gas through the action of anaerobic microorganisms; the anoxic tank 22 reduces nitrite and nitrate into nitrogen gas through denitrification; the aerobic tank 23 converts ammonia nitrogen into nitrite and nitrate through nitrification; the sedimentation tank 24 separates the sludge and water through physical sedimentation. The clear liquid at the upper end of the sedimentation tank 24 flows into the clear water tank 10 along the second overflow pipe 29. The whole system is reasonably designed and stable in operation. It is suitable for the treatment of rural domestic sewage with high concentration of ammonia nitrogen and has high practical value.

[0041] Embodiment 2:

[0042] The difference between this embodiment and the above embodiment is that: Reference Figure 3 In this embodiment, a bacteria inactivation device 5 is also provided, and the bacteria inactivation device 5 includes a heating tube section 51 connected to the second sludge return pipe 26 section, a heating tube 52 is fixed outside the heating tube section 51, and the heating tube 52 is spirally wound outside the heating tube section 51, and a thermometer 53 is installed on the heating tube 52. The heating tube 52 can be heated by an electric heating tube 52 or a heat transfer liquid heating tube 52, and a suitable heating method is selected according to actual conditions. In this embodiment, the heating tube 52 is specifically heated by heat transfer liquid heating. The thermometer 53 monitors the temperature of the heat transfer liquid in the heating tube 52 in real time, so as to control the heat transfer liquid in the heat transfer pipe to be kept at 50-60 degrees Celsius. When the sludge in the aerobic tank 23 flows to the second sludge return pipe 26 under the action of the reflux pump, the sludge enters the heating tube section 51, and the heating tube 52 heats the sludge in the heating tube section 51 to inactivate the nitrifying bacteria in the sludge. This can reduce the number of nitrifying bacteria in the sludge flowing back into the anoxic tank 22, reduce the concentration of nitrate ammonia entering the anoxic tank 22, facilitate the denitrification process in the anoxic tank 22, and improve the removal rate of total ammonia.

[0043] In other embodiments, a bacteria inactivation device 5 may also be installed on the first sludge return pipe 25 .

[0044] In order to ensure that the sludge entering the heating cylinder section 51 can be heated evenly and improve the inactivation effect, a second agitator 54 is provided on the heating cylinder section 51, and the stirring end of the second agitator 54 is located in the heating cylinder section 51; when the sludge enters the heating cylinder section 51, the second agitator 54 is started to ensure that the sludge is heated evenly and prevent local overheating.

[0045] Reference Figure 3 The two air inlet branches 431 corresponding to the anoxic tank 22 and the aerobic tank 23 are both connected to the dilution air pipe 44, and the air inlet branch 431 and the dilution air pipe 44 are both provided with a proportional regulating valve 45, and the anoxic tank 22 and the aerobic tank 23 are both provided with a dissolved oxygen detector 46. When in use, nitrogen or rare gas is introduced into the dilution air pipe 44; the oxygen content of the gas in the aeration network pipe 42 in the aerobic tank 23 and the anoxic tank 22 can be accurately flowed through the proportional regulating valve 45, and the dissolved oxygen content in the anoxic tank 22 and the aerobic tank 23 is ensured to be appropriate without reducing the uniformity of mixing of microorganisms and activated sludge. The dissolved oxygen detector 46 can monitor the dissolved oxygen content in the anoxic tank 22 and the aerobic tank 23 in real time, and adjust each proportional regulating valve 45 in time.

[0046] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A high-concentration ammonia nitrogen rural domestic sewage treatment system, characterized in that: include: Regulating tank (1), A basic sewage treatment device (2) is connected to the regulating tank (1), and comprises an anaerobic tank (21), an anoxic tank (22), an aerobic tank (23) and a sedimentation tank (24) which are connected in sequence, wherein a first sludge return pipe (25) is connected between the anaerobic tank (21) and the sedimentation tank (24), and a second sludge return pipe (26) is connected between the aerobic tank (23) and the anoxic tank (22), a first driving source (27) is provided on the first sludge return pipe (25), and a second driving source (28) is provided on the second sludge return pipe (26), the first driving source (27) is used to drive the fluid in the first sludge return pipe (25) to flow into the anaerobic tank (21), and the second driving source (28) is used to drive the fluid in the second sludge return pipe (26) to flow into the anoxic tank (22); The sewage enhanced treatment equipment (3) is connected between the sewage basic treatment equipment (2) and the regulating tank (1), the sewage enhanced treatment equipment (3) comprises a biochemical tank (31), an aerobic box (32) and an anoxic box (33) arranged in the biochemical tank (31), and the aerobic box (32) and the anoxic box (33) are connected to each other; an aeration device (4) for aerating the anoxic tank (22), the aerobic tank (23), the anoxic box (33) and the aerobic box (32); The bacteria inactivation device (5) is used to inactivate nitrifying bacteria in the second sludge return pipe (26).

2. A high-concentration ammonia nitrogen rural domestic sewage treatment system according to claim 1, characterized in that: The aeration equipment (4) comprises a gas transporter (41) and an aeration network pipe (42) connected to the gas transporter (41), and the aeration network pipe (42) is arranged in the aerobic tank (23), the anoxic tank (22), the aerobic box (32) and the anoxic box (33).

3. A high-concentration ammonia nitrogen rural domestic sewage treatment system according to claim 2, characterized in that: The sewage enhanced treatment equipment (3) further comprises a dosing module (6), wherein the dosing module (6) comprises a dosing tank (61), a dosing pump (62) and a drug delivery tube (63) connected to the dosing tank (61), one end of the drug delivery tube (63) being connected to the biochemical pool (31), and the dosing pump (62) being used to drive the liquid in the drug delivery tube (63) to move toward the biochemical pool (31).

4. A high-concentration ammonia nitrogen rural domestic sewage treatment system according to claim 3, characterized in that: The drug adding tank (61) is provided with a first agitator (64).

5. A high-concentration ammonia nitrogen rural domestic sewage treatment system according to claim 1, characterized in that: A three-phase separator (7) is arranged in the biochemical pool (31), and the three-phase separator (7) comprises a separator body (71) and an inlet pipe (72) and an outlet pipe (73) connected to the separator body (71); an aeration network pipe (42) is also arranged below the inlet pipe (72); and the outlet pipe (73) is connected to a clean water pool (10).

6. A high-concentration ammonia nitrogen rural domestic sewage treatment system according to claim 2, characterized in that: The bacteria inactivation device (5) comprises a heating tube section (51) connected to the second sludge return pipe (26) section, a heating pipe (52) is arranged outside the heating tube section (51), and the heating pipe (52) is spirally wound outside the heating tube section (51), and a thermometer (53) is arranged on the heating pipe (52).

7. A high-concentration ammonia nitrogen rural domestic sewage treatment system according to claim 6, characterized in that: The heating cylinder section (51) is provided with a second stirrer (54).

8. A high-concentration ammonia nitrogen rural domestic sewage treatment system according to claim 6, characterized in that: The aeration device (4) further comprises an air intake main pipe (43) and an air intake branch pipe (431) connected to the air intake main pipe (43), the air intake main pipe (43) is connected to the gas transporter (41), a plurality of air intake branch pipes (431) are provided, and the air intake branch pipes (431) are connected to the aeration network pipes (42) in a one-to-one correspondence; The air intake branch pipe (431) is connected to a dilution air pipe (44), and a proportional regulating valve (45) is provided on the air intake branch pipe (431) and the dilution air pipe (44), and a dissolved oxygen detector (46) is provided in the anoxic tank (22) and the aerobic tank (23).

9. A high-concentration ammonia nitrogen rural domestic sewage treatment system according to claim 1, characterized in that: It also includes a sludge tank (8), and the sedimentation tank (24) is connected to the sludge tank (8).

10. A high-concentration ammonia nitrogen rural domestic sewage treatment system according to claim 1, characterized in that: It also comprises a lifting well (9), wherein a lifting pump (91) is arranged in the lifting well (9), and the lifting pump (91) is connected to a material delivery pipe (92), one end of the material delivery pipe (92) is connected to the regulating tank (1), and the lifting pump (91) is used to transport the fluid in the lifting well (9) to the regulating tank (1).

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