Adjustable two-section multi-stage AO nitrogen and phosphorus removal system
By adopting a controllable two-stage multi-stage AO nitrogen removal and phosphorus removal system in sewage treatment, the problems of low efficiency and high cost of nitrogen removal and phosphorus removal in traditional AO processes are solved, and efficient wastewater treatment and cost savings are achieved.
Patent Information
- Application Number
- CN202420523353.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-18
- Publication Date
- 2025-03-07
- Estimated Expiration
- 2034-03-18
AI Technical Summary
The traditional AO process has low efficiency in nitrogen removal and phosphorus removal in sewage treatment, and requires a large amount of carbon sources, resulting in increased costs and increased residual sludge production.
The adjustable two-stage multi-stage AO nitrogen removal and phosphorus removal system is adopted. Through the combination of the first and second stage multi-stage AO systems, it includes a multi-stage pool and a control device respectively, which controls the opening and closing of the aeration and stirring device, adjusts the pool function and pool capacity ratio, and realizes multi-stage multi-stage treatment of wastewater.
It improves the efficiency of nitrogen removal and phosphorus removal, reduces the amount of added carbon sources, reduces the operating costs, and reduces the amount of residual sludge produced.
Smart Images
Figure CN222574446U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of sewage treatment, and more specifically relates to an adjustable two-stage multi-stage AO denitrification and phosphorus removal system. Background Art
[0002] The national control standards for total nitrogen and total phosphorus in the effluent of sewage treatment plants are becoming increasingly stringent. In the secondary biochemical treatment process of sewage treatment plants, there is a common problem of insufficient carbon source in the influent, and additional carbon source needs to be added to achieve TN (total nitrogen) and TP (total phosphorus) indicators. The traditional AO process is also called anaerobic aerobic process. This technology is a sewage treatment technology that combines biofilm and traditional sludge method. However, the traditional AO process has low efficiency in denitrification and phosphorus removal, and requires a large amount of additional carbon source, which significantly increases the cost. Utility Model Content
[0003] The utility model provides an adjustable two-stage multi-level AO denitrification and phosphorus removal system, which solves the problem of excessively high sewage treatment costs caused by the addition of an external carbon source in the prior art, and can also improve the denitrification and phosphorus removal efficiency, while saving costs, reducing the amount of residual sludge generated and the amount of aeration.
[0004] In order to achieve the above technical purpose, the technical solution adopted by the utility model is:
[0005] A controllable two-stage multi-stage AO denitrification and phosphorus removal system comprises a water inlet tank, a first-stage multi-stage AO system, a first sedimentation tank, a second-stage multi-stage AO system, a second sedimentation tank, and a sludge storage tank connected in sequence; the first-stage multi-stage AO system and the second-stage multi-stage AO system respectively comprise a plurality of tank bodies, each of which is provided with an aeration device and a stirring device, the aeration device supplies oxygen and aeration through an air pipeline, each aeration device and stirring device is independently provided with a control switch, and the function of each tank body can be controlled by controlling the opening and closing of the aeration device and stirring device of each tank body, the aeration device of the aerobic tank is turned on and the stirring device is turned off, and the aeration device of the anaerobic tank and the anoxic tank is turned off and the stirring device is turned on; each tank body in the first-stage multi-stage AO system is controlled to be arranged alternately with an anoxic tank and an aerobic tank, and each tank body in the second-stage multi-stage AO system is controlled to be arranged alternately with an anaerobic tank, an anoxic tank and an aerobic tank.
[0006] Preferably, the number of stages of the first-stage multi-stage AO system and the second-stage multi-stage AO system are not less than 3.
[0007] Preferably, in the first-stage multi-stage AO system, the volume ratio of the anoxic tank to the aerobic tank is 1.5:1.
[0008] Another preferred embodiment is that in the first-stage multi-stage AO system, the volume ratio of the aerobic tank to the anoxic tank is 1.5:1.
[0009] Furthermore, in the first multi-stage AO system, a sludge return pipeline is arranged between the terminal aerobic tank and the front-end anoxic tank; a sludge return pipeline is arranged between the first sedimentation tank and the front-end anoxic tank of the first multi-stage AO system.
[0010] Preferably, in the second-stage multi-stage AO system, the volume ratio of the anaerobic tank, the anoxic tank and the aerobic tank is 1.5:1.5:1.
[0011] Another preferred embodiment is that in the second-stage multi-stage AO system, the volume ratio of the anaerobic tank, the anoxic tank and the aerobic tank is 1:1:2.
[0012] Furthermore, in the second multi-stage AO system, a sludge return pipeline is arranged between the terminal aerobic tank and the frontmost anaerobic tank; a sludge return pipeline is arranged between the second sedimentation tank and the frontmost anaerobic tank of the second multi-stage AO system.
[0013] Furthermore, each pool body is also provided with a carbon supply device, which is connected to a carbon source storage tank via a carbon source dosing pump and a carbon source pipeline. An external carbon source is stored in the carbon source storage tank, and the external carbon source is respectively added to each anoxic pool of the first multi-stage AO system and the second multi-stage AO system.
[0014] Furthermore, it also includes a control unit, which is electrically connected to the aeration device, the stirring device, and the carbon supply device, and the opening and closing of each aeration device, the stirring device, and the carbon supply device are regulated by the control unit.
[0015] The beneficial effects of the utility model are:
[0016] The utility model provides an adjustable two-stage multi-level AO denitrification and phosphorus removal system, which adopts a first-stage multi-level AO system and a second-stage multi-level AO system to achieve multi-stage and multi-level treatment of wastewater, and controls the opening and closing of an aeration device and a stirring device of each tank body to adjust the function of each tank body, and adjusts the tank volume ratio of each tank body according to wastewater with different loads, thereby improving the denitrification and phosphorus removal efficiency, reducing the dosage of an external carbon source, and saving operating costs.
[0017] The utility model is provided with a multiple reflux system to avoid the loss of anaerobic sludge and reduce the output of surplus sludge. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.
[0019] Figure 1 It is a process schematic diagram of an embodiment of the utility model.
[0020] Figure numerals: 1. water inlet tank, 2. first anoxic tank, 3. first aerobic tank, 4. second anoxic tank, 5. second aerobic tank, 6. third anoxic tank, 7. third aerobic tank, 8. first sedimentation tank, 9. anaerobic tank A, 10. anoxic tank A, 11. aerobic tank A, 12. anaerobic tank B, 13. anoxic tank B, 14. aerobic tank B, 15. anaerobic tank C, 16. anoxic tank C, 17. aerobic tank C, 18. anaerobic tank D, 19. anoxic tank D, 20. aerobic tank D, 21. second sedimentation tank, 22. carbon source storage tank, 23. sludge storage tank. DETAILED DESCRIPTION
[0021] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians of the art without making creative work are within the scope of protection of the present application.
[0022] A controllable two-stage multi-stage AO denitrification and phosphorus removal system comprises a water inlet tank 1, a first-stage multi-stage AO system, a first sedimentation tank 8, a second-stage multi-stage AO system, a second sedimentation tank 21, and a sludge storage tank 23 connected in sequence; the first-stage multi-stage AO system and the second-stage multi-stage AO system respectively comprise a plurality of tank bodies, each of which is provided with an aeration device and a stirring device, the aeration device supplies oxygen and aeration through an air pipeline, and the opening and closing of the aeration device and the stirring device of each tank body are controlled to control the function of each tank body, the aeration device of the aerobic tank is turned on and the stirring device is turned off, the aeration device of the anaerobic tank and the anoxic tank is turned off and the stirring device is turned on, the tank bodies in the first-stage multi-stage AO system are controlled to be arranged alternately with the anoxic tank and the aerobic tank, and the tank bodies in the second-stage multi-stage AO system are controlled to be arranged alternately with the anaerobic tank, the anoxic tank and the aerobic tank.
[0023] First, the sewage is stored in the water inlet tank 1, and enters the anoxic tank at the head end of the first multi-stage AO system through the water inlet pipeline. After a series of ammoniation and denitrification, the nitrite and nitrate in the sewage are reduced to nitrogen gas for denitrification. In the aerobic tank, the microorganisms in the sludge absorb phosphorus from the sewage, thereby effectively reducing the nitrogen and phosphorus pollutants in the water. After passing through the first multi-stage AO system, the sewage enters the first sedimentation tank 8 for sedimentation, and then enters the first anaerobic tank, anoxic tank and aerobic tank of the second multi-stage AO system in sequence, and continues to undergo a series of nitrification, denitrification, and aerobic phosphorus removal to further improve the efficiency of nitrogen and phosphorus removal. Finally, the sewage is discharged after passing through the second sedimentation tank 21. According to the level of the influent load and concentration, the aeration device and the stirring device of each tank body are controlled to open and close, wherein the aeration device of the aerobic tank is opened and the stirring device is closed, and the aeration device of the anaerobic tank and the anoxic tank is closed and the stirring device is opened, and the function of each tank body is regulated, thereby regulating the tank capacity ratio of each tank body.
[0024] Preferably, the number of stages of the first-stage multi-stage AO system and the second-stage multi-stage AO system are not less than 3.
[0025] In the first-stage multi-stage AO system, each tank body is adjusted to be arranged with anoxic tanks and aerobic tanks at intervals. When the COD and total nitrogen concentrations of the sewage inlet are high, the setting of the anoxic tank is increased, and the volume ratio of the anoxic tank to the aerobic tank is 1.5:1; when the COD and total nitrogen concentrations of the sewage inlet are low, the setting of the aerobic tank is increased, and the volume ratio of the aerobic tank to the anoxic tank is 1.5:1, and the water temperature is controlled between 15-35°C. Preferably, a sludge return pipeline is arranged between the terminal aerobic tank and the front-end anoxic tank in the first-stage multi-stage AO system, so that part of the mixed liquid in the terminal aerobic tank is returned to the front-end anoxic tank; a sludge return pipeline is also arranged between the first sedimentation tank and the front-end anoxic tank of the first-stage multi-stage AO system, so that the sludge in the first sedimentation tank is returned to the front-end anoxic tank of the first-stage multi-stage AO system.
[0026] In the second-stage multi-stage AO system, each tank body is regulated to be arranged at intervals of anaerobic tank, anoxic tank and aerobic tank. The function of each tank body is set according to the COD and total nitrogen concentration of the sewage inlet. When the COD and total nitrogen concentration of the inlet water are high, the setting of the anaerobic tank and the anoxic tank is increased, and the tank volume ratio of the anaerobic tank, the anoxic tank and the aerobic tank is 1.5:1.5:1. When the COD and total nitrogen concentration of the inlet water are low, the setting of the aerobic tank is increased, and the tank volume ratio of the anaerobic tank, the anoxic tank and the aerobic tank is 1:1:2, and the water temperature is controlled between 15-35°C. Preferably, in the second-stage multi-stage AO system, a sludge return pipeline is arranged between the terminal aerobic tank and the frontmost anaerobic tank, so that part of the mixed liquid in the terminal aerobic tank is returned to the frontmost anaerobic tank; a sludge return pipeline is also arranged between the second sedimentation tank and the frontmost anaerobic tank, so that the sludge in the second sedimentation tank is returned to the frontmost anaerobic tank.
[0027] Each pool body is also provided with a carbon supply device, which is connected to the carbon source storage tank through a carbon source dosing pump and a carbon source pipeline. The external carbon source is stored in the carbon source storage tank, and the external carbon source is respectively added to each anoxic pool of the first multi-stage AO system and the second multi-stage AO system.
[0028] Furthermore, it also includes a control unit, which is electrically connected to the aeration device, the stirring device, and the carbon supply device, and the opening and closing of each aeration device, the stirring device, and the carbon supply device are regulated by the control unit.
[0029] The utility model is suitable for denitrification and phosphorus removal of industrial wastewater with large changes in water quality and total nitrogen. Preferably, it is suitable for wastewater treatment with COD concentration of 100-500 mg / L, pH of 7.0-8.5, total nitrogen concentration of 150-800 mg / L, total phosphorus concentration of 35.0-70.0 mg / L, and ammonia nitrogen concentration of 120.0-250 mg / L.
[0030] In a specific embodiment, Figure 1 As shown, the first-stage multi-stage AO system is set to 3 levels in total, and the second-stage multi-stage AO system is set to 4 levels in total. First, the sewage is stored in the water inlet tank 1, enters the first anoxic tank 2 of the first multi-stage AO system through the water inlet pipeline, and then passes through the first aerobic tank 3, the second anoxic tank 4, the second aerobic tank 5, the third anoxic tank 6, and the third aerobic tank 7 of the first multi-stage AO system in sequence, and then enters the first sedimentation tank 8 and continues to enter the anaerobic tank A9 of the second multi-stage AO system, and then passes through the anoxic tank A10, aerobic tank A11, anaerobic tank B12, anoxic tank B13, aerobic tank B14, anaerobic tank C15, anoxic tank C16, aerobic tank C17, anaerobic tank D18, anoxic tank D19, and aerobic tank D20 of the multi-stage AO system in sequence, and finally the sewage is discharged after passing through the second sedimentation tank 21, and the remaining sludge enters the sludge storage tank 23, the carbon source is stored in the carbon source storage tank 22, and is added to the anoxic tanks of the first multi-stage AO system and the second multi-stage AO system through the carbon source pipeline.
[0031] Experimental Example 1
[0032] The total hydraulic retention time of the first and second multi-stage AO systems is 96h, and the water inflow of the test device is 0.05m 3 / h, the suspended solid concentration of the mixed liquid is 5000-6000 mg / L, the carbon source dosage is 100 L / d, and the aeration volume is 1m 3 / h, mixed liquid reflux rate 0.18m 3 / h, the return flow of the first stage multi-stage AO system is 0.18m 3 / h, the sludge return flow of the second stage multi-stage AO system is 0.23m 3 / h. After the test device was debugged and stabilized, it was operated continuously for 7 days under the same inlet water quality conditions. Water samples from the first and second multi-stage AO systems were taken every day to measure the inlet and outlet COD, ammonia nitrogen, TN, TP and other values, and the average values were taken. The test data are shown in Table 1.
[0033] Table 1 Water quality test data of inlet and outlet water of this device
[0034]
[0035] As can be seen from Table 1, the device of the utility model performs multi-stage treatment on wastewater, and can achieve an overall removal rate of ammonia nitrogen and TN of up to 99.1% and 96.7%, and an overall removal rate of TP of 80.1%, with good denitrification and phosphorus removal effects.
[0036] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, technicians familiar with the field may make various corresponding changes and deformations based on the present invention, but these corresponding changes and deformations should all fall within the scope of protection of the claims attached to the present invention.
Claims
1. A controllable two-stage multi-stage AO denitrification and phosphorus removal system, characterized in that: It includes a water inlet tank, a first multi-stage AO system, a first sedimentation tank, a second multi-stage AO system, a second sedimentation tank, and a mud storage tank connected in sequence; the first multi-stage AO system and the second multi-stage AO system respectively include a number of tank bodies, each of which is provided with an aeration device and a stirring device, the aeration device supplies oxygen and aeration through an air pipeline, each aeration device and stirring device is independently provided with a control switch, and the function of each tank body can be regulated by controlling the opening and closing of the aeration device and stirring device of each tank body, the aeration device of the aerobic tank is turned on, the stirring device is turned off, and the aeration device of the anaerobic tank and the anoxic tank is turned off, and the stirring device is turned on; In the first-stage multi-stage AO system, each tank body is regulated to be arranged with anoxic tanks and aerobic tanks at intervals. In the second-stage multi-stage AO system, each tank body is regulated to be arranged with anaerobic tanks, anoxic tanks and aerobic tanks at intervals.
2. The controllable two-stage multi-stage AO denitrification and phosphorus removal system according to claim 1 is characterized in that: The number of stages of the first-stage multi-stage AO system and the second-stage multi-stage AO system is not less than 3.
3. The controllable two-stage multi-stage AO denitrification and phosphorus removal system according to claim 2 is characterized in that: In the first stage multi-stage AO system, the volume ratio of the anoxic tank to the aerobic tank is 1.5:
1.
4. The controllable two-stage multi-stage AO denitrification and phosphorus removal system according to claim 2 is characterized in that: In the first stage multi-stage AO system, the volume ratio of aerobic tank to anoxic tank is 1.5:
1.
5. The controllable two-stage multi-stage AO denitrification and phosphorus removal system according to claim 3 or 4, characterized in that: In the first multi-stage AO system, a sludge return pipeline is arranged between the terminal aerobic tank and the front-end anoxic tank; a sludge return pipeline is arranged between the first sedimentation tank and the front-end anoxic tank of the first multi-stage AO system.
6. The controllable two-stage multi-stage AO denitrification and phosphorus removal system according to claim 2 is characterized in that: In the second-stage multi-stage AO system, the volume ratio of the anaerobic tank, the anoxic tank and the aerobic tank is 1.5:1.5:
1.
7. The controllable two-stage multi-stage AO denitrification and phosphorus removal system according to claim 2 is characterized in that: In the second-stage multi-stage AO system, the volume ratio of the anaerobic tank, the anoxic tank and the aerobic tank is 1:1:
2.
8. The controllable two-stage multi-stage AO denitrification and phosphorus removal system according to claim 6 or 7, characterized in that: In the second-stage multi-stage AO system, a sludge return pipeline is arranged between the terminal aerobic tank and the front-end anaerobic tank; a sludge return pipeline is arranged between the second sedimentation tank and the front-end anaerobic tank of the second-stage multi-stage AO system.
9. The controllable two-stage multi-stage AO denitrification and phosphorus removal system according to claim 1 is characterized in that: Each pool body is also provided with a carbon supply device, which is connected to a carbon source storage tank via a carbon source dosing pump and a carbon source pipeline. An external carbon source is stored in the carbon source storage tank, and the external carbon source is respectively added to each anoxic pool of the first multi-stage AO system and the second multi-stage AO system.
10. The controllable two-stage multi-stage AO denitrification and phosphorus removal system according to claim 9 is characterized in that: It also includes a control unit, which is electrically connected to the aeration device, the stirring device, and the carbon supply device, and the opening and closing of each aeration device, the stirring device, and the carbon supply device are regulated by the control unit.