Sewage treatment device based on anaerobic ammonia oxidation

Abstract

The utility model discloses a sewage treatment device based on anaerobic ammonia oxidation, which comprises a PLC (programmable logic controller) and a first sedimentation tank, the first sedimentation tank is connected with a nitrosation reaction tank through a first connecting pipe, and the nitrosation reaction tank is connected with an anaerobic ammonia oxidation reactor through a second connecting pipe. The anaerobic ammonia oxidation reactor is connected with a second sedimentation tank through a third connecting pipe, and the second sedimentation tank is connected with a multi-layer filtering device through a fourth connecting pipe; an aeration disc is arranged at the bottom in the nitrosation reaction tank, and an air inlet of the aeration disc penetrates out of the nitrosation reaction tank and is connected with an induced draft fan through an aeration pipeline; the second connecting pipe is connected with an anaerobic bacteria culture device through a branch pipeline, and a one-way proportional valve for controlling the anaerobic bacteria culture device to fall into the second connecting pipe is arranged on the branch pipeline; the output end of the PLC is connected with the induced draft fan and the controlled end of the one-way proportional valve. According to the utility model, the denitrification efficiency of sewage can be greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to a sewage treatment device based on anaerobic ammonia oxidation. Background Art

[0002] The intensification of eutrophication of water bodies and the unreasonable discharge of substandard water have aggravated water pollution. While causing potential pollution to drinking water sources, it has greatly damaged human health and safety and the rapid development of the economy. With the improvement of people's living standards and the increasing attention to water quality and health, sewage treatment has become an important strategic goal for the development of the national economy. Advanced sewage treatment processes have been continuously developed and applied to the deep treatment of sewage. As one of the potential sources of drinking water, the degree and depth of sewage treatment always affect the changes in the water environment and the innovation of water treatment processes.

[0003] Among the mainstream sewage treatment processes, biological treatment methods are widely used in sewage treatment plants across the country due to their advantages such as simple process, good treatment effect and obvious economic benefits. Traditional biological denitrification processes have the disadvantages of large land area, high energy consumption, low denitrification efficiency and the need to add a large amount of organic carbon source in the treatment of high-concentration ammonia nitrogen wastewater and low C / N ratio wastewater. Therefore, the development of new high-efficiency and low-energy denitrification technologies has important research value in the field of water pollution control.

[0004] Anaerobic ammonium oxidation is a new denitrification process. The reaction process is that anaerobic ammonia oxidation bacteria (AnAOB) reacts with ammonia nitrogen as an electron acceptor and nitrite nitrogen as an electron donor to generate nitrogen under anaerobic conditions. It has many advantages in replacing the traditional anaerobic denitrification process: no oxygen aeration is required, reducing energy consumption; no external carbon source is required as an electron donor to treat wastewater with a low C / N ratio, reducing treatment costs.

[0005] However, some existing sewage treatment devices based on anaerobic ammonium oxidation have complex operations when mixing sewage and anaerobic bacteria, and the anaerobic ammonium oxidation reaction starts slowly, which greatly affects the denitrification treatment of sewage and affects the sewage treatment efficiency. Utility Model Content

[0006] The technical problem to be solved by the utility model is to provide a sewage treatment device based on anaerobic ammonia oxidation to solve the problems raised in the background technology.

[0007] In order to solve the above technical problems, the technical solutions adopted by the present utility model are as follows.

[0008] A sewage treatment device based on anaerobic ammonium oxidation comprises a PLC controller and a first sedimentation tank for sedimenting sewage, wherein the first sedimentation tank is connected to a nitrification reaction tank located behind the first sedimentation tank through a first connecting pipe, the nitrification reaction tank is connected to an anaerobic ammonium oxidation reactor located behind the nitrification reaction tank through a second connecting pipe, the anaerobic ammonium oxidation reactor is connected to a second sedimentation tank located behind the anaerobic ammonium oxidation reactor through a third connecting pipe, and the second sedimentation tank is connected to a multilayer filtration device located behind the second sedimentation tank through a fourth connecting pipe; an aeration plate is arranged at the bottom of the nitrification reaction tank, an air inlet of the aeration plate passes through the nitrification reaction tank and is connected to an induced draft fan through an aeration pipe; the second connecting pipe is connected to an anaerobic bacteria culture device through a branch pipe, and a one-way proportional valve for controlling the anaerobic bacteria culture device to fall into the second connecting pipe is arranged on the branch pipe; the output end of the PLC controller is respectively connected to the induced draft fan and the controlled end of the one-way proportional valve.

[0009] Preferably, the water inlet of the first connecting pipe in the first sedimentation tank is provided with a filter head for filtering, the first connecting pipe is provided with a first pump for pumping the sewage precipitated in the first sedimentation tank into the nitrite reaction tank and a first flow meter for monitoring the pumping amount, the controlled end of the first pump is connected to the output end of the PLC controller, and the output end of the first flow meter is connected to the input end of the PLC controller.

[0010] Preferably, the nitrite reaction tank is provided with an NH4+ concentration sensor for monitoring the NH4+ concentration in the sewage, a DO concentration sensor for monitoring the DO concentration and a NO2-N / NO3-N concentration sensor for monitoring the NO2-N / NO3-N concentration; the aeration pipe is provided with an air flow meter for monitoring the amount of air introduced into the aeration disk by the induced draft fan and a pressure sensor for monitoring the aeration pipe pressure; the output ends of the NH4+ concentration sensor, DO concentration sensor, NO2-N / NO3-N concentration sensor, air flow meter and pressure sensor are respectively connected to the input end of the PLC controller.

[0011] Preferably, the second connecting pipe is provided with a second pump for pumping the sewage in the nitrite reaction tank into the anaerobic ammonia oxidation reactor and a second flow meter for monitoring the pumping amount, the controlled end of the second pump is connected to the output end of the PLC controller, and the output end of the second flow meter is connected to the input end of the PLC controller.

[0012] Preferably, a one-way exhaust valve for discharging nitrogen is provided on the top of the anaerobic ammonium oxidation reactor, a heater for heating and a temperature sensor for monitoring the internal temperature of the anaerobic ammonium oxidation reactor are provided inside the anaerobic ammonium oxidation reactor, the controlled ends of the one-way exhaust valve and the heater are respectively connected to the output ends of the PLC controller, and the output end of the temperature sensor is connected to the input end of the PLC controller.

[0013] Preferably, the third connecting pipe is provided with a third pump for pumping the sewage treated in the anaerobic ammonium oxidation reactor into the second sedimentation tank, and the controlled end of the third pump is connected to the output end of the PLC controller.

[0014] Preferably, the fourth connecting pipe is provided with a fourth pump for pumping the sewage precipitated in the second sedimentation tank into the multi-layer filtering device.

[0015] Preferably, the bottom mud outlets of the first sedimentation tank and the second sedimentation tank are connected to a sludge thickening tank through a connected mud discharge pipe, and the bottom mud outlets of the first sedimentation tank and the second sedimentation tank are respectively provided with sludge pumps for pumping sludge into the sludge thickening tank, and the controlled end of the sludge pump is connected to the output end of the PLC controller.

[0016] Due to the adoption of the above technical scheme, the technical progress achieved by the utility model is as follows.

[0017] The utility model can achieve thorough treatment of sewage by treating sewage step by step through the first sedimentation tank, nitrite reaction tank, anaerobic ammonium oxidation reactor, second sedimentation tank and multi-layer filtering device. The molar concentration ratio of NH4+ and NO2-N in sewage entering the anaerobic ammonium oxidation reactor is controlled through the nitrite reaction tank, thereby ensuring the rapid start-up of the anaerobic ammonium oxidation reaction in the subsequent anaerobic ammonium oxidation reactor. At the same time, through the anaerobic bacteria cultivation device, the anaerobic ammonium oxidation bacteria and sewage are fully mixed as needed during the process of sewage flowing into the anaerobic ammonium oxidation reactor 17, thereby greatly improving the denitrification efficiency of sewage. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the utility model.

[0019] Wherein: 1. first sedimentation tank, 2. first connecting pipe, 3. filter head, 4. first pump, 5. first flow meter, 6. nitrite reaction tank, 7. aeration plate, 8. induced draft fan, 9. air flow meter, 10. pressure sensor, 11. second connecting pipe, 12. second pump, 13. second flow meter, 14. branch pipe, 15. one-way proportional valve, 16. anaerobic bacteria culture device, 17. anaerobic ammonia oxidation reactor, 171. one-way exhaust valve, 18. third connecting pipe, 19. third pump, 20. second sedimentation tank, 21. fourth connecting pipe, 22. fourth pump, 23. multi-layer filtration device, 24. sludge concentration tank, 25. sludge pump. DETAILED DESCRIPTION

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0021] A sewage treatment device based on anaerobic ammonium oxidation, combined with Figure 1 As shown, it includes a PLC controller and a first sedimentation tank 1, a nitrite reaction tank 6, an anaerobic ammonium oxidation reactor 17, a second sedimentation tank 20 and a multi-layer filtering device 23 which are connected in sequence.

[0022] The first sedimentation tank 1 is used to precipitate impurities in the sewage, and the first sedimentation tank 1 is connected to the nitrification reaction tank 6 located at the rear through the first connecting pipe 2. The first pump 4 and the first flow meter 5 are arranged on the first connecting pipe 2, wherein the first pump 4 is used to pump the sewage precipitated in the first sedimentation tank 1 into the nitrification reaction tank 6, and the water inlet of the first connecting pipe 2 in the first sedimentation tank 1 is provided with a filter head 3, and the filter head 3 is used to achieve filtration; the first flow meter 5 is used to monitor the pumping amount.

[0023] The nitrification reaction tank 6 is used to perform anaerobic nitrification treatment on the sewage. An aeration plate 7 is arranged at the bottom of the nitrification reaction tank 6. The air inlet of the aeration plate 7 passes through the nitrification reaction tank 6 and is connected to an induced draft fan 8 through an aeration pipe. The induced draft fan 8 is used to introduce air into the aeration plate 7, and the air is mixed with the sewage through the aeration plate 7. An air flow meter 9 and a pressure sensor 10 are arranged on the aeration pipe, wherein the air flow meter 9 is used to monitor the amount of air introduced into the aeration plate 7 by the induced draft fan 8; and the pressure sensor 10 is used to monitor the pressure of the aeration pipe. An NH4+ concentration sensor, a DO concentration sensor and a NO2-N / NO3-N concentration sensor are arranged in the nitrification reaction tank 6, wherein the NH4+ concentration sensor is used to monitor the NH4+ concentration in the sewage; the DO concentration sensor is used to monitor the DO concentration in the sewage; and the NO2-N / NO3-N concentration sensor is used to monitor the NO2-N / NO3-N concentration in the sewage. Through the above design, it is possible to control the molar concentration ratio of NH4+ and NO2-N in the wastewater of the nitrite reaction tank 6 by controlling the aeration volume of the aeration disk 7 according to the information monitored by the air flow meter 9, the NH4+ concentration sensor, the DO concentration sensor and the NO2-N / NO3-N concentration sensor, thereby ensuring the rapid start-up of the anaerobic ammonium oxidation reaction in the subsequent anaerobic ammonium oxidation reactor 17 and effectively shortening the reaction time.

[0024] The nitrite reaction pool 6 is connected to the anaerobic ammonium oxidation reactor 17 located at the rear through the second connecting pipe 11. The second connecting pipe 11 is provided with a second pump 12 and a second flow meter 13, wherein the second pump 12 is used to pump the sewage in the nitrite reaction pool 6 into the anaerobic ammonium oxidation reactor 17; the second flow meter 13 is used to monitor the pumping amount. The second connecting pipe 11 is connected to an anaerobic bacteria culture device 16 through a branch pipe 14. The anaerobic bacteria culture device 16 is used to culture anaerobic ammonia-oxidizing bacteria. The bottom end of the anaerobic bacteria culture device 16 is connected to a one-way proportional valve 15 arranged on the branch pipe 14 through the branch pipe 14. The one-way proportional valve 15 is used to control the anaerobic bacteria culture device 16 to fall into the second connecting pipe 11 through the branch pipe 14, so that the flow rate of the anaerobic ammonia-oxidizing bacteria falling into the second connecting pipe 11 is always kept within a precise range. At the same time, the flow rate of the anaerobic ammonia-oxidizing bacteria can be adjusted according to the sewage flow information monitored by the second flowmeter 13, so that the sewage and the anaerobic ammonia-oxidizing bacteria can be mixed in proportion in the second connecting pipe 11, and under the action of the sewage flow, the two are fully mixed, thereby improving the mixing efficiency of the anaerobic ammonia-oxidizing bacteria inside the sewage, and realizing that the sewage can be efficiently denitrified without setting a stirring mechanism inside the anaerobic ammonia oxidation reactor 17.

[0025] A one-way exhaust valve 171 is provided at the top of the anaerobic ammonium oxidation reactor 17. The one-way exhaust valve 171 is used to exhaust nitrogen and prevent the gas in the air from entering the interior of the anaerobic ammonium oxidation reactor 17, thereby ensuring the growth and reaction of the anaerobic ammonium oxidizing bacteria colony inside the anaerobic ammonium oxidation reactor 17. A heater and a temperature sensor are provided inside the anaerobic ammonium oxidation reactor 17, wherein the heater is used for heating so as to maintain a suitable temperature inside the anaerobic ammonium oxidation reactor 17, thereby ensuring that the anaerobic ammonium oxidation reaction is fully carried out and improving the denitrification efficiency of sewage; and the temperature sensor is used to monitor the internal temperature of the anaerobic ammonium oxidation reactor 17.

[0026] The anaerobic ammonium oxidation reactor 17 is connected to a second sedimentation tank 20 located at the rear through a third connecting pipe 18. A third pump 19 is provided on the third connecting pipe 18. The third pump 19 is used to pump the treated sewage in the anaerobic ammonium oxidation reactor 17 into the second sedimentation tank 20. The second sedimentation tank 20 is used to separate the mud-water mixture discharged from the anaerobic ammonium oxidation reactor 17.

[0027] The second sedimentation tank 20 is connected to the multi-layer filtering device 23 located at the rear through the fourth connecting pipe 21. The fourth connecting pipe 21 is provided with a fourth pump 22. The fourth pump 22 is used to pump the sewage precipitated in the second sedimentation tank 20 into the multi-layer filtering device 23. The multi-layer filtering device 23 is used to filter the sewage step by step, so as to achieve thorough treatment of the sewage and provide clean water.

[0028] The bottom mud outlets of the first sedimentation tank 1 and the second sedimentation tank 20 are connected to the sludge thickening tank 24 through a connected mud discharge pipe. The bottom mud outlets of the first sedimentation tank 1 and the second sedimentation tank 20 are respectively provided with sludge pumps 25, and the sludge pumps 25 are used to pump the sludge into the sludge thickening tank 24, and the sludge thickening tank 24 is used to compress the sludge.

[0029] The input end of the PLC controller is respectively connected to the output ends of the first flow meter 5, the NH4+ concentration sensor, the DO concentration sensor, the NO 2-N / NO3-N concentration sensor, the air flow meter 9, the pressure sensor 10, the second flow meter 13 and the temperature sensor; the output end of the PLC controller is respectively connected to the controlled ends of the first pump 4, the second pump 12, the one-way exhaust valve 171, the heater, the third pump 19, the induced draft fan 8, the one-way proportional valve 15 and the sludge pump 25. The PLC controller is used to realize the automatic control of the sewage treatment process of the device.

[0030] When the utility model is in use, sewage is treated step by step through the first sedimentation tank 1, the nitrite reaction tank 6, the anaerobic ammonium oxidation reactor 17, the second sedimentation tank 20 and the multi-layer filtering device 23, so that the sewage can be treated thoroughly. The molar concentration ratio of NH4+ and NO2-N in the sewage entering the anaerobic ammonium oxidation reactor 17 is controlled by the nitrite reaction tank 6, so as to ensure the rapid start of the anaerobic ammonium oxidation reaction in the subsequent anaerobic ammonium oxidation reactor 17. At the same time, the anaerobic bacteria culture device 16 is provided to achieve the process of sewage flowing into the anaerobic ammonium oxidation reactor 17. The anaerobic ammonium oxidation bacteria and the sewage are fully mixed as needed, which greatly improves the denitrification efficiency of the sewage.

Claims

1. A sewage treatment device based on anaerobic ammonium oxidation, characterized in that: The invention comprises a PLC controller and a first sedimentation tank (1) for sedimenting sewage, wherein the first sedimentation tank (1) is connected to a nitrification reaction tank (6) located behind the first sedimentation tank (1) through a first connecting pipe (2), the nitrification reaction tank (6) is connected to an anaerobic ammonium oxidation reactor (17) located behind the nitrification reaction tank (6) through a second connecting pipe (11), the anaerobic ammonium oxidation reactor (17) is connected to a second sedimentation tank (20) located behind the anaerobic ammonium oxidation reactor (17) through a third connecting pipe (18), and the second sedimentation tank (20) is connected to a second sedimentation tank (20) located behind the second sedimentation tank (20) through a fourth connecting pipe (21). 0) rear multi-layer filtering device (23); an aeration plate (7) is arranged at the bottom of the nitrite reaction pool (6); an air inlet of the aeration plate (7) passes through the nitrite reaction pool (6) and is connected to an induced draft fan (8) through an aeration pipeline; the second connecting pipe (11) is connected to an anaerobic bacteria culture device (16) through a branch pipeline (14); a one-way proportional valve (15) is arranged on the branch pipeline (14) for controlling the anaerobic bacteria culture device (16) to fall into the second connecting pipe (11) anaerobic ammonia-oxidizing bacteria; the output end of the PLC controller is respectively connected to the induced draft fan (8) and the controlled end of the one-way proportional valve (15).

2. The sewage treatment device based on anaerobic ammonium oxidation according to claim 1, characterized in that: The water inlet of the first connecting pipe (2) in the first sedimentation tank (1) is provided with a filter head (3) for achieving filtration, the first connecting pipe (2) is provided with a first pump (4) for pumping the sewage after sedimentation in the first sedimentation tank (1) into the nitrite reaction tank (6) and a first flow meter (5) for monitoring the pumping amount, the controlled end of the first pump (4) is connected to the output end of the PLC controller, and the output end of the first flow meter (5) is connected to the input end of the PLC controller.

3. The sewage treatment device based on anaerobic ammonium oxidation according to claim 1, characterized in that: The nitrite reaction pool (6) is provided with an NH4+ concentration sensor for monitoring the NH4+ concentration in the sewage, a DO concentration sensor for monitoring the DO concentration, and a NO2-N / NO3-N concentration sensor for monitoring the NO2-N / NO3-N concentration; the aeration pipeline is provided with an air flow meter (9) for monitoring the amount of air introduced into the aeration disk (7) by the induced draft fan (8), and a pressure sensor (10) for monitoring the pressure of the aeration pipeline; the output ends of the NH4+ concentration sensor, the DO concentration sensor, the NO2-N / NO3-N concentration sensor, the air flow meter (9), and the pressure sensor (10) are respectively connected to the input end of the PLC controller.

4. The sewage treatment device based on anaerobic ammonium oxidation according to claim 1, characterized in that: The second connecting pipe (11) is provided with a second pump (12) for pumping sewage in the nitrite reaction tank (6) into the anaerobic ammonia oxidation reactor (17) and a second flow meter (13) for monitoring the pumping amount, the controlled end of the second pump (12) is connected to the output end of the PLC controller, and the output end of the second flow meter (13) is connected to the input end of the PLC controller.

5. The sewage treatment device based on anaerobic ammonium oxidation according to claim 1, characterized in that: A one-way exhaust valve (171) for exhausting nitrogen is arranged on the top of the anaerobic ammonium oxidation reactor (17); a heater for heating and a temperature sensor for monitoring the internal temperature of the anaerobic ammonium oxidation reactor (17) are arranged inside the anaerobic ammonium oxidation reactor (17); the controlled ends of the one-way exhaust valve (171) and the heater are respectively connected to the output ends of the PLC controller, and the output end of the temperature sensor is connected to the input end of the PLC controller.

6. The sewage treatment device based on anaerobic ammonium oxidation according to claim 1, characterized in that: The third connecting pipe (18) is provided with a third pump (19) for pumping the sewage treated in the anaerobic ammonium oxidation reactor (17) into the second sedimentation tank (20), and the controlled end of the third pump (19) is connected to the output end of the PLC controller.

7. The sewage treatment device based on anaerobic ammonium oxidation according to claim 1, characterized in that: The fourth connecting pipe (21) is provided with a fourth pump (22) for pumping the sewage precipitated in the second sedimentation tank (20) into the multi-layer filtering device (23).

8. The sewage treatment device based on anaerobic ammonium oxidation according to claim 1, characterized in that: The bottom mud outlets of the first sedimentation tank (1) and the second sedimentation tank (20) are connected to a sludge thickening tank (24) via a connected mud discharge pipe, and the bottom mud outlets of the first sedimentation tank (1) and the second sedimentation tank (20) are respectively provided with a sludge pump (25) for pumping sludge into the sludge thickening tank (24), and the controlled end of the sludge pump (25) is connected to the output end of the PLC controller.

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