Plug flow type anaerobic ammonia oxidation wastewater treatment device

Abstract

The utility model discloses a plug-flow anaerobic ammonia oxidation wastewater treatment device, which relates to the field of wastewater treatment and comprises a wastewater treatment body, a water distribution tank, a gas stripping pipeline and an aeration device, the wastewater treatment body is provided with an aeration area and a settling area, and a biological membrane, granular sludge forming bacteria, a biological carrier and sludge floc are arranged in the aeration area; the settling zone is communicated with the aeration zone and is used for settling sludge; the water distribution tank is arranged above the settling zone; one end of the gas stripping pipeline is arranged at the bottom of the settling zone and communicated with the settling zone, and the other end of the gas stripping pipeline is communicated with the water distribution tank; the water distribution tank can be communicated with the aeration area and the settling area; the aeration device is communicated with the aeration area and provides oxygen for the aeration area; the aeration device can be communicated with the bottom of the gas stripping pipeline and enables sludge at the bottom of the settling zone to enter the water distribution tank through the gas stripping pipeline. The coexistence of the granular sludge, the biological membrane and the sludge floc is realized in the plug flow type wastewater treatment device, and the pollutant removal load and the impact resistance of the granular sludge are improved.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and in particular to a plug-flow anaerobic ammonia oxidation wastewater treatment device. Background Technology

[0002] With the rapid pace of industrialization in my country and the increasing diversification of products, industrial wastewater is becoming more complex in composition and its discharge volume is increasing. Large amounts of wastewater containing nitrogen and phosphorus nutrients are being discharged into rivers and lakes, leading to eutrophication and disrupting the aquatic ecosystem. The mainstream nitrogen removal technology for wastewater treatment in my country remains the activated sludge process. This process is a complete denitrification process, including ammonia oxidation, nitrification, and denitrification. It offers good treatment results and is simple to operate. However, this method suffers from drawbacks such as low pollutant removal load, large land area required, poor resistance to shock loads, and large amounts of residual sludge, resulting in high infrastructure and operating costs and high energy consumption.

[0003] Anaerobic ammonia oxidation technology has become one of the most energy-efficient and sustainable biological denitrification pathways due to its advantages such as high efficiency, low consumption, and no need for carbon source addition. However, the retention of anaerobic ammonia oxidation bacteria is a major challenge in its application. Existing plug-flow anaerobic ammonia oxidation wastewater treatment devices mostly rely on external packing carriers to form a biofilm to enhance the retention of anaerobic ammonia oxidation bacteria. However, the pollutant removal load of a single biofilm system is low, and the wastewater treatment effect is poor. Utility Model Content

[0004] The purpose of this invention is to provide a plug-flow anaerobic ammonia oxidation wastewater treatment device to solve the problems existing in the prior art. It has a simple structure and realizes the coexistence of granular sludge, biofilm and sludge flocs in the plug-flow wastewater treatment device, thereby improving the pollutant removal load and the shock resistance of granular sludge.

[0005] To achieve the above objectives, this utility model provides the following solution:

[0006] This utility model provides a plug-flow anaerobic ammonia oxidation wastewater treatment device, including a wastewater treatment body, a water distribution tank, an air lift pipeline, and an aeration device, wherein:

[0007] The wastewater treatment unit is provided with an aeration zone and a sedimentation zone. The aeration zone is provided with an inlet for wastewater to enter the wastewater treatment unit. The aeration zone is provided with biofilm, granular sludge forming bacteria, biological carriers and sludge flocs. The sedimentation zone is connected to the aeration zone and is provided with an outlet. The sedimentation zone is used for sedimentation of sludge in the wastewater.

[0008] The water distribution tank is located above the sedimentation zone;

[0009] One end of the air-lift pipeline is connected to the sedimentation zone, and the other end of the air-lift pipeline is connected to the water distribution tank; the water distribution tank can be connected to both the aeration zone and the sedimentation zone.

[0010] The aeration device can be connected to the aeration zone and provide oxygen to the aeration zone; the aeration device can be connected to the bottom of the air lift pipeline and allow the sludge at the bottom of the sedimentation zone to enter the water distribution tank through the air lift pipeline.

[0011] Preferably, the aeration zone is provided with the water inlet at one end, and the aeration zone near the water inlet is provided with the biofilm, granular sludge-forming bacteria, biological carrier, and sludge flocs; the water distribution tank is connected to the aeration zone near the water inlet.

[0012] Preferably, the water distribution tank includes a tank body and a plurality of first baffles fixedly connected to the tank body, wherein two adjacent first baffles are respectively separated from the inner top wall and the inner bottom wall of the tank body to form a first flow channel.

[0013] Preferably, the wastewater treatment body further includes a baffle zone, which is located on the side of the aeration zone away from the inlet. The baffle zone is connected to both the aeration zone and the sedimentation zone. Multiple second baffles are provided in the baffle zone. A gap is left between two adjacent second baffles and the inner top wall and the inner bottom wall of the wastewater treatment body, respectively, forming a second flow channel. The wastewater in the aeration zone and the granular sludge in the aeration zone can pass through the multiple second flow channels of the baffle zone in sequence and enter the sedimentation zone through the upper inlet of the sedimentation zone.

[0014] Preferably, the water distribution tank is connected to the end of the deflection zone away from the water inlet.

[0015] Preferably, the wastewater treatment body includes a reactor body and a settling device. The reactor body has an aeration zone and a baffle zone arranged sequentially along its length. The settling device is disposed within the baffle zone and includes an outer shell and an inner shell with openings at both ends. The inner shell is disposed inside the outer shell and at the upper end of the outer shell. An annular flow guiding zone is formed between the outer side wall of the inner shell and the inner side wall of the outer shell. The upper end of the flow guiding zone is connected to both the baffle zone and the water distribution tank, and the lower end of the flow guiding zone is connected to the lower end of the inner shell.

[0016] Preferably, a baffle zone is formed between two adjacent second baffles, and the baffle zone that is far away from the aeration zone is a terminal baffle zone, and the sedimentation device is disposed in the terminal baffle zone; the water distribution tank is connected to the terminal baffle zone.

[0017] Preferably, it also includes an internal circulation pump, the inlet end of which is connected to the end of the baffle zone away from the aeration zone, and the outlet end of which is connected to the end of the aeration zone away from the baffle zone. The internal circulation pump can pump the wastewater and the granular sludge in the baffle zone to the aeration zone.

[0018] Preferably, it also includes a sludge discharge pump, which is connected to the bottom of the sedimentation zone and is capable of discharging sludge from the bottom of the sedimentation zone.

[0019] Preferably, the device further includes a pH meter, a dissolved oxygen meter, an ammonia nitrogen meter, a nitrate nitrogen meter, and a control system. The pH meter can detect the pH value of the wastewater in the aeration zone, the dissolved oxygen meter can detect the dissolved oxygen concentration of the wastewater in the aeration zone, the ammonia nitrogen meter can detect the ammonia nitrogen concentration of the wastewater in the aeration zone, and the nitrate nitrogen meter can detect the nitrate nitrogen concentration of the wastewater in the aeration zone. The pH meter, the dissolved oxygen meter, the ammonia nitrogen meter, and the nitrate nitrogen meter are all communicatively connected to the control system. The control system is signal-connected to the aeration device.

[0020] The present invention achieves the following technical advantages over the prior art:

[0021] This utility model provides a plug-flow anaerobic ammonia oxidation wastewater treatment device, including a wastewater treatment body, a water distribution tank, an air lift pipeline, and an aeration device. The wastewater treatment body has an aeration zone and a sedimentation zone. The aeration zone has an inlet for wastewater to enter the wastewater treatment body and contains a biofilm, granular sludge-forming bacteria, a biological carrier, and sludge flocs. The sedimentation zone is connected to the aeration zone and has an outlet. The sedimentation zone is used for settling sludge in the wastewater. The water distribution tank is located above the sedimentation zone. One end of the air lift pipeline is connected to the sedimentation zone, and the other end is connected to the water distribution tank. The water distribution tank can be connected to both the aeration zone and the sedimentation zone. The aeration device can be connected to the aeration zone and provide oxygen to the aeration zone. The aeration device can be connected to the bottom of the air lift pipeline, allowing sludge from the bottom of the sedimentation zone to enter the water distribution tank via the air lift pipeline.

[0022] The plug-flow anaerobic ammonia oxidation wastewater treatment device provided by this utility model has the following advantages: First, the aeration zone of this utility model is equipped with biological carriers and sludge flocs. These carriers and flocs provide a substrate for short-range nitrifying bacteria and anaerobic ammonia oxidizing bacteria to attach. Furthermore, by setting up an aeration zone, sedimentation zone, and water distribution tank, this utility model provides suitable conditions for short-range nitrifying bacteria and anaerobic ammonia oxidizing bacteria to form a biofilm on the biological carriers and sludge flocs, and for the sludge flocs containing these bacteria to generate granular sludge. Specifically: through... The aeration device supplies oxygen to the aeration zone, ensuring sufficient dissolved oxygen in the wastewater. The sedimentation zone achieves solid-liquid separation, allowing heavier sludge to settle and remain in the system. An air-lift pipeline transports the sludge from the sedimentation zone to a distribution tank. This tank circulates sludge back to the aeration zone, meeting the required sludge volume for granular sludge formation. Simultaneously, it circulates sludge back to the sedimentation zone, extending the sludge settling path, enhancing the sludge selection mechanism, and improving the selection effect, thus better forming granular sludge. Ammonia nitrogen in the externally input wastewater undergoes short-range nitrification anaerobic ammonium oxidation in the aeration zone, generating nitrogen gas and simultaneously removing some of the chemical oxygen demand (COD) from the water, reducing the COD value and pollutant content. Furthermore, this invention combines biofilm and granular sludge in a plug-flow anaerobic ammonium oxidation wastewater treatment device, achieving the coexistence of granular sludge, biofilm, and sludge flocs, increasing the pollutant removal load and improving the shock resistance of the granular sludge. Secondly, this invention uses an air-lift pipeline to lift the sludge from the sedimentation zone to the distribution tank, which better preserves the morphology of the granular sludge, prevents or avoids breakage of the granular sludge during circulation, and thus prevents sludge disintegration, ensuring the wastewater treatment effect of the system. Thirdly, this invention simultaneously provides oxygen to the aeration zone and provides air-lift power to the air-lift pipeline through an aeration device, which helps to simplify the structure. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of the plug-flow anaerobic ammonia oxidation wastewater treatment device provided in this embodiment;

[0025] In the diagram: 100. Plug-flow anaerobic ammonia oxidation wastewater treatment device; 1. Water distribution tank; 101. First baffle plate; 102. First settling zone; 103. Water distribution and upflow zone; 104. Second settling zone; 2. Air lift pipeline; 3. Aeration device; 301. Aeration blower; 302. First aeration pipeline; 303. Second aeration pipeline; 304. Aeration diffusion device; 305. Gas regulating valve; 4. Aeration zone; 401. Packing assembly; 402. Granular sludge; 403. Sludge flocs; 404. Inlet pipeline; 5. Baffle zone; 501. Second baffle plate; 502. 503. Baffle rising zone; 6. Baffle settling zone; 6. Settling device; 601. Inner shell; 602. Guide zone; 603. Effluent weir; 604. Effluent pipeline; 605. Support leg; 606. Chemical anchor; 607. V-shaped sludge hopper; 7. Internal circulation pump; 8. Sludge discharge pump; 9. pH meter; 10. Dissolved oxygen meter; 11. Ammonia nitrogen meter; 12. Nitrate nitrogen meter; 13. First sludge circulation pipeline; 14. Second sludge circulation pipeline; 15. Third sludge circulation pipeline; 16. Valve; 17. Sludge discharge pipeline; 18. Internal circulation pipeline; 19. Flow meter. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] The purpose of this invention is to provide a plug-flow anaerobic ammonia oxidation wastewater treatment device to solve the problems existing in the prior art. It has a simple structure, improves the pollutant removal load, and enhances the shock resistance of granular sludge.

[0028] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] like Figure 1As shown, this embodiment provides a plug-flow anaerobic ammonia oxidation wastewater treatment device 100, including a wastewater treatment body, a water distribution tank 1, an air lift pipeline 2, and an aeration device 3. The wastewater treatment body is provided with an aeration zone 4 and a sedimentation zone. The aeration zone 4 has an inlet for wastewater to enter the wastewater treatment body and contains a biofilm, granular sludge-forming bacteria, a biological carrier, and sludge flocs 403. The sedimentation zone is connected to the aeration zone 4 and has an outlet for settling sludge in the wastewater. The water distribution tank 1 is located above the sedimentation zone. One end of the air lift pipeline 2 is connected to the sedimentation zone, and the other end is connected to the water distribution tank 1. The water distribution tank 1 can be connected to both the aeration zone 4 and the sedimentation zone. The aeration device 3 can be connected to the aeration zone 4 and provide oxygen to it. The aeration device 3 can be connected to the bottom of the air lift pipeline 2 and allow sludge from the bottom of the sedimentation zone to enter the water distribution tank 1 via the air lift pipeline 2. It should be noted that the aeration zone 4 in this embodiment is a plug-flow aeration zone 4.

[0030] The plug-flow anaerobic ammonia oxidation wastewater treatment device 100 provided in this embodiment has the following advantages: First, the aeration zone 4 of this embodiment is equipped with biological carriers and sludge flocs 403. The biological carriers and sludge flocs 403 can provide a substrate for short-range nitrifying bacteria and anaerobic ammonia oxidizing bacteria to attach. Furthermore, this embodiment, by setting up the aeration zone 4, sedimentation zone, and water distribution tank 1, provides suitable conditions for short-range nitrifying bacteria and anaerobic ammonia oxidizing bacteria to form a biofilm on the biological carriers and sludge flocs 403, and for the sludge flocs 403 containing short-range nitrifying bacteria and anaerobic ammonia oxidizing bacteria to generate granular sludge 402. Specifically: through the aeration device... 3. Oxygen is supplied to the aeration zone 4 to ensure that the wastewater contains sufficient dissolved oxygen. The sedimentation zone is used to achieve solid-liquid separation, allowing heavier sludge to settle and remain in the system. The air lift pipeline 2 can transport the sludge from the sedimentation zone to the water distribution tank 1. The water distribution tank 1 circulates the sludge back to the aeration zone 4 to replenish the aeration zone. On the other hand, the water distribution tank 1 circulates the sludge back to the sedimentation zone, which accelerates the flow rate of cement in the sedimentation zone, improves the circulation efficiency, extends the sludge settling path, strengthens the sludge selection mechanism in the sedimentation zone, and enhances the selection effect, thereby better forming granular sludge 402. Ammonia nitrogen in wastewater input from the outside can undergo short-range nitrification anaerobic ammonium oxidation in aeration zone 4 to generate nitrogen gas, while simultaneously removing some of the chemical oxygen demand (COD) in the water, reducing the COD value and pollutant content. Furthermore, this embodiment combines biofilm and granular sludge 402 in a plug-flow anaerobic ammonium oxidation wastewater treatment device 100, achieving the coexistence of granular sludge 402, biofilm, and sludge flocs 403 within the plug-flow wastewater treatment device, increasing the pollutant removal load and enhancing the shock resistance of the granular sludge 402. Second, this embodiment uses an airlift pipeline 2 to lift the sludge from the sedimentation zone to the distribution tank 1, better preserving the morphology of the granular sludge 402, preventing or avoiding breakage of the granular sludge 402 during circulation, thereby preventing sludge disintegration and ensuring the wastewater treatment effect of the system. Third, this embodiment simultaneously provides oxygen to aeration zone 4 and provides airlift power to airlift pipeline 2 through aeration device 3, which helps simplify the structure.

[0031] In some embodiments, an inlet is provided at one end of the aeration zone 4, and a biological carrier and sludge flocs 403 are provided at the end of the aeration zone 4 near the inlet. A biofilm is attached to the biological carrier, and granular sludge-forming bacteria are disposed in the sludge flocs 403. The water distribution tank 1 is connected to the end of the aeration zone 4 near the inlet to extend the circulation path of the granular sludge 402.

[0032] In some embodiments, the water distribution tank 1 includes a tank body and a plurality of first baffles 101 fixedly connected to the tank body. Adjacent first baffles 101 have gaps between themselves and the inner top wall and inner bottom wall of the tank body, respectively, forming first flow channels. The first baffles 101 divide the water distribution tank 1 into a water distribution riser zone 103 and a water distribution settling zone. Water and sludge flow upwards along the water distribution riser zone 103 and enter the adjacent water distribution settling zone through the corresponding upper first flow channel. Within the settling zone, they flow downwards and enter the adjacent water distribution riser zone 103 through the corresponding lower first flow channel, circulating sequentially. The air-lifted sludge and gas mixture undergoes multiple baffles, releasing excess air bubbles and thus reducing the impact of sludge returning to the aeration zone 4 on the dissolved oxygen concentration within the aeration zone 4.

[0033] In some embodiments, the wastewater treatment body further includes a baffle zone 5, which is located on the side of the aeration zone 4 away from the inlet. The baffle zone 5 is connected to both the aeration zone 4 and the sedimentation zone. Multiple second baffles 501 are provided within the baffle zone 5. Gaps are left between adjacent second baffles 501 and the inner top and bottom walls of the wastewater treatment body, respectively, forming second flow channels. Wastewater from the aeration zone 4 and granular sludge 402 within the aeration zone 4 can sequentially pass through the multiple second flow channels of the baffle zone 5 and enter the sedimentation zone from the upper inlet. The second baffles 501 divide the baffle zone 5 into several baffle rising zones 502 and baffle settling zones 503. The second flow channels between the baffle rising zones 502 and baffle settling zones 503 are alternately arranged vertically. The end of the baffle settling zone 503 is connected to the beginning of the baffle rising zone 502. The baffle zone 5 extends the circulation path of sludge and water, and changes the flow properties of sludge through multiple cycles, enhancing hydraulic shear and selective pressure, thereby promoting the formation of granular sludge, which is beneficial to improving the forming effect of granular sludge 402 and improving the wastewater treatment effect.

[0034] In some embodiments, the water distribution tank 1 is connected to the end of the baffle zone 5 away from the inlet. A local circulation is formed in the lower part of the baffle zone 5, which promotes the circulation of fluid between the baffle zone 5 and the settling zone. At the same time, the local circulation promotes the formation of granular sludge 402.

[0035] In some embodiments, the wastewater treatment unit includes a reactor body and a settling device 6. The reactor body has an aeration zone 4 and a baffle zone 5 arranged sequentially along its length. The settling device 6 is located within the baffle zone 5 and includes an outer shell and an inner shell 601 with openings at both ends. The inner shell 601 is located inside the outer shell and at the upper end of the outer shell. An annular guide zone 602 is formed between the outer side wall of the inner shell 601 and the inner side wall of the outer shell. The upper end of the guide zone 602 is connected to both the baffle zone 5 and the water distribution tank 1. The sludge-water mixture entering the settling device 6 first flows downward along the guide zone 602. During the flow, the air carried in the wastewater can be released from the upper end of the guide zone 602. Then, the sludge-water mixture is baffled and enters the inner shell 601. The air disturbs the sludge settling within the inner shell 601, thereby improving the sludge settling performance and better screening of the sludge. The settling device 6 and the reactor body are two independent structures. The settling device 6 can be prefabricated and can be directly installed on the existing reactor body, reducing the difficulty and cost of modifying the existing reactor body.

[0036] In some embodiments, a baffle zone is formed between two adjacent second baffles 501, and the baffle zone 5 away from the aeration zone 4 is the end baffle zone. The settling device 6 is set in the end baffle zone; the water distribution tank 1 is connected to the end baffle zone.

[0037] In some embodiments, an internal circulation pump 7 and a sludge discharge pump 8 are also included. The inlet end of the internal circulation pump 7 is connected to the end of the baffle zone 5 away from the aeration zone 4, and the outlet end of the internal circulation pump 7 is connected to the end of the aeration zone 4 away from the baffle zone 5. The internal circulation pump 7 can pump wastewater and granular sludge 402 from the baffle zone 5 to the aeration zone 4. The sludge discharge pump 8 is connected to the bottom of the sedimentation zone and can discharge the sludge from the bottom of the sedimentation zone. If the sludge return flow rate from the water distribution tank 1 to the aeration zone 4 cannot meet the flow rate requirements of the baffle zone 5, the internal circulation pump 7 can be turned on to supplement the flow rate. At the same time, the mixed water supplemented by the internal circulation pump 7 can serve as dilution water to reduce the pollutant concentration at the inlet end of the aeration zone 4, so that the short-cut nitrification anaerobic ammonium oxidation system can operate more stably. The sludge discharge pump 8 is used to discharge excess sludge, preferably to the sludge dewatering room for subsequent treatment and utilization.

[0038] In some embodiments, the system further includes a pH meter 9, a dissolved oxygen meter 10, an ammonia nitrogen meter 11, a nitrate nitrogen meter 12, and a control system. The pH meter 9 can detect the pH value of the wastewater in the aeration zone 4, the dissolved oxygen meter 10 can detect the dissolved oxygen concentration of the wastewater in the aeration zone 4, the ammonia nitrogen meter 11 can detect the ammonia nitrogen concentration of the wastewater in the aeration zone 4, and the nitrate nitrogen meter 12 can detect the nitrate nitrogen concentration of the wastewater in the aeration zone 4. The pH meter 9, dissolved oxygen meter 10, ammonia nitrogen meter 11, and nitrate nitrogen meter 12 are all communicatively connected to the control system. The control system is signal-connected to the aeration device 3. The control system can automatically calculate the aeration rate based on the detection data from pH meter 9, dissolved oxygen meter 10, ammonia nitrogen meter 11, and nitrate nitrogen meter 12, and control the aeration device 3. It adjusts the aeration intensity of the aeration device 3 according to changes in influent flow and water quality to maintain the required dissolved oxygen concentration, ensuring the system's effluent meets standards and preventing over-aeration or insufficient aeration that could lead to substandard effluent indicators. It should be noted that the required aeration rate can be calculated manually, and the aeration rate of the aeration device 3 can be manually controlled. Preferably, the control system automatically corrects the aeration intensity based on the deviation between the detected values ​​and the set values ​​of each meter, adjusting the aeration intensity of the aeration fan 301 according to the required aeration rate.

[0039] In a preferred embodiment, the dissolved oxygen concentration in aeration zone 4 should be controlled at 0.2-1 mg / L to ensure good reaction performance. The surface hydraulic loading of the sedimentation zone should be controlled at 1.0-5.0 m. 3 / (m 2 ·h).

[0040] In some embodiments, the reactor also includes an inlet pipe 404 and an outlet pipe 604. An outlet weir 603 is provided at the upper end of the inner shell 601 of the settling device 6. The inlet pipe 404 is connected to the inlet of the aeration zone 4, and the outlet pipe 604 is connected to the outlet provided on the outlet weir 603. Wastewater enters the reactor body through the inlet pipe 404 and flows sequentially through the aeration zone 4, the baffle zone 5, and the sedimentation zone. The treated effluent from the sedimentation zone is discharged through the outlet pipe 604. If multiple sedimentation zones are provided within a single reactor body, it is preferable to combine the effluent from the outlet weirs 603 of each sedimentation zone before conveying it to the outlet pipe 604.

[0041] In some embodiments, a support leg 605 is also fixedly connected to the outer shell of the settling device 6. The settling device 6 is fixed to the bottom of the reactor body by the support leg 605, preferably by a chemical anchor 606.

[0042] In some embodiments, the bottom of the settling device 6 is a V-shaped sludge hopper 607 that is larger at the top and smaller at the bottom. The air lift pipeline 2 is located at the small end of the V-shaped sludge hopper 607. The sludge discharge pump 8 is connected to the small end of the V-shaped sludge hopper 607 through the sludge discharge pipeline 17, so as to facilitate the lifting of the granular sludge 402 by the air lift pipeline 2 and the discharge of the sludge by the sludge discharge pump 8.

[0043] In some embodiments, the water distribution tank is connected to the lower end of the terminal baffle zone via the first sludge circulation pipe 13, the water distribution tank is connected to the upper end of the guide zone 602 via the second sludge circulation pipe 14, and the water distribution tank is connected to the lower end of the aeration zone 4 away from the sedimentation zone via the third sludge circulation pipe 15.

[0044] In some embodiments, a first settling zone 102 is provided in the middle of the water distribution tank 1. A water distribution riser zone 103 and a second settling zone 104 are provided on both sides of the first settling zone 102 in sequence. The upper end of the air lift pipe 2 is fixedly connected to and communicates with the upper end of the first settling zone 102. A portion of the sludge-gas mixture in the first settling zone 102 flows through the water distribution riser zone 103 and the second settling zone 104 on one side of the first settling zone 102, and enters the first sludge circulation pipe 13 from the lower end of the second settling zone 104. The other portion of the sludge-gas mixture in the first settling zone 102 flows through the water distribution riser zone 103 and the second settling zone 104 on the other side of the first settling zone 102, and enters the second sludge circulation pipe 14 and the third sludge circulation pipe 15 from the lower end of the second settling zone 104. It should be noted that the number of first baffles 101 must ensure that at least one water distribution rise zone 103 can be formed in the water distribution tank 1; the spacing and size of the first baffles 101 in the water distribution tank 1 should be calculated according to the specific water volume and can be flexibly adjusted.

[0045] In some embodiments, the number of second baffles 501 is ≥1 and is odd. The number of second baffles 501 can be implemented according to the actual length of the pool, ensuring that when wastewater enters the baffle zone 5, it first enters the baffle settling zone 503, passes through several baffle rising zones 502 and baffle settling zones 503, and finally enters the sedimentation zone through the baffle rising zone 502. The spacing of the second baffles 501 should be calculated based on the water flow rate and area of ​​the baffle zone 5, ensuring that the water flow velocity in the baffle rising zone 502 is maintained at 3-20 m / h to obtain suitable hydraulic shear force and selective pressure, which helps to further form granular sludge 402. The second flow channel of the second baffle 501 is preferably set in a funnel shape, with the larger end of the funnel being the inlet and the smaller end being the outlet, which helps to reduce the deposition of granular sludge 402 and promotes overall circulation.

[0046] In some embodiments, the first sludge circulation pipeline 13, the second sludge circulation pipeline 14, and the third sludge circulation pipeline 15 are all equipped with valves 16 capable of flow regulation. The valves 16 control the flow rate of sludge return by adjusting their opening degree. By adjusting the flow rate of the valve 16 on the third sludge circulation pipeline 15, the required flow rate of the baffle rising zone 502 of the baffle zone 5 can be ensured, while a certain amount of sludge is added to the aeration zone 4.

[0047] In some embodiments, the aeration device 3 includes an aeration blower 301, a first aeration pipe 302, a second aeration pipe 303, an aeration diffuser 304, and a gas regulating valve 305. The aeration blower 301 is located outside the entire device and is used to draw in air from the outside. The aeration blower 301 is equipped with a frequency converter system, and the control system is connected to the frequency converter system, which can control the air supply of the aeration blower 301. There are two aeration pipes, and the aeration diffuser 304 is located at the bottom of the aeration zone 4. The aeration blower 301 is connected to the aeration diffuser 304 through the first aeration pipe 302. 4. The aeration zone 4 is connected and interconnected. The aeration diffusion device 304 improves the uniformity of oxygen supply. The aeration blower 301 is connected to the bottom of the air lift pipe 2 through the second aeration pipe 303. The lower end of the air lift pipe 2 is provided with a bell-shaped opening with the larger end facing the bottom of the sedimentation zone. Specifically, the second aeration pipe 303 extends into the bell-shaped opening to realize the air lift function. There are two gas regulating valves 305, one on each of the two aeration pipes. The two gas regulating valves 305 control the air flow rate from the aeration pipes to the aeration zone 4 and the air lift pipe 2 by adjusting their own opening. The air volume required for the air lift pipe 2 is approximately 3-5 times the required sludge return flow rate to the distribution tank 1.

[0048] In some embodiments, the internal circulation pump 7 is preferably connected to the lower end of one end of the aeration zone 4's principle baffle zone 5 via the internal circulation pipeline 18. Flow meters 19 are installed on the internal circulation pipeline 18, the sludge discharge pipeline 17 (or the pipeline at the output end of the sludge discharge pump 8), the first sludge circulation pipeline 13, the second sludge circulation pipeline 14, and the third sludge circulation pipeline 15 to detect the flow rate of the sludge-water mixture in the corresponding pipeline.

[0049] In some embodiments, the internal circulation pump 7 can control the flow rate of the mixture in the internal circulation pipeline 18 by changing its own frequency.

[0050] In some embodiments, the biological carrier is a packing component 401, the granular sludge forming bacteria are mainly short-range nitrifying bacteria and denitrifying bacteria, and the generated biofilm and granular sludge 402 mainly contain anaerobic ammonia oxidizing bacteria, short-range nitrifying bacteria and denitrifying bacteria.

[0051] In some embodiments, the inlet end of the air-lift pipeline 2 is located 20-30 cm below the liquid surface in the sedimentation zone.

[0052] The main working process of a plug-flow anaerobic ammonia oxidation wastewater treatment device 100 provided in this embodiment is as follows:

[0053] Aeration is achieved through aeration device 3 to aeration zone 4 and air lift pipeline 2. Wastewater enters the aeration zone 4 of the reactor body through inlet pipeline 404, where a biofilm can be formed on the biological carrier and sludge flocs 403. The sludge flocs 403 can be used to generate granular sludge 402. The sludge-water mixture enters the guide zone 602 of the settling zone through baffle zone 5. Under the action of gravity, the sludge settles to the bottom of the settling zone. The treated liquid enters the inner shell 601 and flows from the upper outlet of the inner shell 601 to the effluent weir 603, and is then discharged through effluent pipeline 604. The sludge at the bottom of the V-shaped sludge hopper 607 enters the water distribution tank 1 under the air lift action of air lift pipeline 2, and flows back to the lower end of baffle zone 5, the lower end of aeration zone 4, and guide zone 602 respectively to ensure the formation of granular sludge 402 and to ensure the hydraulic shear force of baffle zone 5. If the sludge return flow from the distribution tank 1 to the aeration zone 4 is insufficient to meet the flow requirements of the baffle zone 5, the internal circulation pump 7 can be activated to supplement the flow. Simultaneously, the mixed liquid supplemented by the internal circulation pump 7 can act as dilution water to reduce the pollutant concentration at the inlet of the aeration zone 4, allowing the short-cut nitrification anaerobic ammonium oxidation system to operate more stably. The sludge discharge pump 8 is used to discharge excess sludge, ensuring the normal operation of the system.

[0054] This embodiment couples multiple sludge forms, including sludge flocs 403, biofilm packing, and granular sludge 402, into a more widely used plug-flow wastewater treatment device. Combined with airlift technology, the granular sludge 402 is primarily formed in the aeration zone 4 (filled with packing assembly 401), the baffle zone 5, and the sedimentation zone. The coexistence of the biofilm and various sludge forms complement each other, facilitating the retention of anaerobic ammonia oxidizing bacteria. This simultaneously enhances the pollutant removal load and resistance to shock loads, ensuring system stability. The plug-flow wastewater treatment device saves floor space and reduces infrastructure and operating costs. Furthermore, the granular sludge 402 and biofilm technology create a multi-layered aerobic environment, diversifying denitrification reactions. Short-cut nitrification-anaerobic ammonia oxidation, simultaneous nitrification-denitrification, aerobic reactions, and heterotrophic reactions coexist, achieving efficient pollutant removal, reducing biological sludge volume, effectively saving energy and reducing consumption, and truly achieving carbon reduction goals.

[0055] In this embodiment, dewatered sludge from a municipal wastewater treatment plant was inoculated into the device. The influent parameters were: COD ≤ 3000 mg / L, ammonia nitrogen ≤ 3000 mg / L, total nitrogen ≤ 3500 mg / L, and SS ≤ 1000 mg / L. After continuous operation for 27 days, a significant anaerobic ammonia-oxidizing bacteria biofilm was found on the packing assembly 401. After 45 days of operation, the sludge mixture in aeration zone 4 was tested and found to have granulated sludge. The total nitrogen removal rate after treatment by the wastewater treatment device could stably reach over 90%, and the ammonia nitrogen removal rate was around 97%. Under these conditions, the device operated stably for three months. The biofilm thickness on the packing assembly 401 increased, and the particle size of the granular sludge 402 gradually increased without any sludge disintegration.

[0056] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A push-flow ANAMMOX wastewater treatment device, characterized by: Includes the wastewater treatment unit, distribution tank, air lift pipeline, and aeration device, wherein: The wastewater treatment unit is provided with an aeration zone and a sedimentation zone. The aeration zone is provided with an inlet for wastewater to enter the wastewater treatment unit. The aeration zone is provided with biofilm, granular sludge forming bacteria, biological carriers and sludge flocs. The sedimentation zone is connected to the aeration zone and is provided with an outlet. The sedimentation zone is used for sedimentation of sludge in the wastewater. The water distribution tank is located above the sedimentation zone; One end of the air-lift pipeline is connected to the sedimentation zone, and the other end of the air-lift pipeline is connected to the water distribution tank; the water distribution tank can be connected to both the aeration zone and the sedimentation zone. The aeration device can be connected to the aeration zone and provide oxygen to the aeration zone; the aeration device can be connected to the bottom of the air lift pipeline and allow the sludge at the bottom of the sedimentation zone to enter the water distribution tank through the air lift pipeline.

2. The ANAMMOX wastewater treatment device according to claim 1, characterized in that: The aeration zone is provided with the water inlet at one end, and the aeration zone near the water inlet is provided with the biofilm, granular sludge forming bacteria, biological carrier and sludge flocs; the water distribution tank is connected to the aeration zone near the water inlet.

3. The ANAMMOX wastewater treatment device according to claim 1, wherein: The water distribution tank includes a tank body and a plurality of first baffles fixedly connected to the tank body. Two adjacent first baffles are respectively separated from the inner top wall and the inner bottom wall of the tank body to form a first flow channel.

4. The ANAMMOX wastewater treatment device according to claim 2, wherein: The wastewater treatment body also includes a baffle zone, which is located on the side of the aeration zone away from the inlet. The baffle zone is connected to both the aeration zone and the sedimentation zone. Multiple second baffles are provided in the baffle zone. A gap is left between two adjacent second baffles and the inner top wall and the inner bottom wall of the wastewater treatment body, respectively, forming a second flow channel. The wastewater in the aeration zone and the granular sludge in the aeration zone can pass through the multiple second flow channels of the baffle zone in sequence and enter the sedimentation zone through the upper inlet of the sedimentation zone.

5. The ANAMMOX wastewater treatment device according to claim 4, wherein: The water distribution tank is connected to the end of the deflection zone away from the water inlet.

6. The ANAMMOX wastewater treatment device according to claim 4, wherein: The wastewater treatment unit includes a reactor body and a settling device. The reactor body has an aeration zone and a baffle zone arranged sequentially along its length. The settling device is located within the baffle zone and includes an outer shell and an inner shell with openings at both ends. The inner shell is located inside the outer shell and at the upper end of the outer shell. An annular flow guiding zone is formed between the outer side wall of the inner shell and the inner side wall of the outer shell. The upper end of the flow guiding zone is connected to both the baffle zone and the water distribution tank, and the lower end of the flow guiding zone is connected to the lower end of the inner shell.

7. The ANAMMOX wastewater treatment device according to claim 6, wherein: A flow deflection zone is formed between two adjacent second baffles. The flow deflection zone that is far away from the aeration zone is the end flow deflection zone. The sedimentation device is installed in the end flow deflection zone. The water distribution tank is connected to the end flow deflection zone.

8. The ANAMMOX wastewater treatment device according to claim 4, wherein: It also includes an internal circulation pump, the inlet of which is connected to the end of the baffle zone away from the aeration zone, and the outlet of which is connected to the end of the aeration zone away from the baffle zone. The internal circulation pump can pump the wastewater and the granular sludge in the baffle zone to the aeration zone.

9. The ANAMMOX wastewater treatment device according to claim 4, wherein: It also includes a sludge pump, which is connected to the bottom of the sedimentation zone and is capable of discharging sludge from the bottom of the sedimentation zone.

10. The ANAMMOX wastewater treatment device according to claim 1, wherein: It also includes a pH meter, a dissolved oxygen meter, an ammonia nitrogen meter, a nitrate nitrogen meter, and a control system. The pH meter can detect the pH value of the wastewater in the aeration zone, the dissolved oxygen meter can detect the dissolved oxygen concentration of the wastewater in the aeration zone, the ammonia nitrogen meter can detect the ammonia nitrogen concentration of the wastewater in the aeration zone, and the nitrate nitrogen meter can detect the nitrate nitrogen concentration of the wastewater in the aeration zone. The pH meter, the dissolved oxygen meter, the ammonia nitrogen meter, and the nitrate nitrogen meter are all communicatively connected to the control system. The control system is signal-connected to the aeration device.

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