High-efficiency anaerobic ammonia oxidation sewage treatment system

Abstract

The present application relates to the technical field of water treatment, in particular to a kind of high-efficiency anaerobic ammonia oxidation sewage treatment system, comprising: anaerobic ammonia pretreatment reactor;Nitritation-anaerobic ammonia oxidation reactor, connected to the effluent of anaerobic ammonia pretreatment reactor;Anaerobic ammonia pretreatment reactor bottom is equipped with water distribution assembly, water distribution assembly includes: first water distribution branch;Second water distribution branch;Third water distribution branch;Second water distribution branch and third water distribution branch pass through flow ratio, cooperate first water distribution branch to make anaerobic ammonia pretreatment reactor inside anaerobic granular sludge bed from anaerobic ammonia pretreatment reactor center to its inner wall occur peristalsis diffusion, the high-efficiency anaerobic ammonia oxidation sewage treatment system of the present application, through the synergistic hierarchical intervention of multidirectional controllable water distribution and ultrasonic energy field, actively maintain the health status of anaerobic granular sludge bed, fundamentally solve the calcification problem.

Description

Technical Field

[0001] This invention relates to the field of water treatment technology, and in particular to a highly efficient anaerobic ammonia oxidation wastewater treatment system. Background Technology

[0002] Anaerobic ammonia oxidation (AAO) is a highly efficient wastewater treatment technology for removing ammonia nitrogen from wastewater. It utilizes specialized microorganisms to achieve efficient nitrogen removal under low energy and material consumption conditions. Currently, it is often combined with short-cut nitrification processes to form a partial nitrification-anaerobic ammonia oxidation process. However, during nitrification, both nitrite-oxidizing bacteria (AOB) and anaerobic ammonia-oxidizing bacteria are autotrophic bacteria, highly sensitive to organic matter. If the COD in the influent is too high, a large number of heterotrophic bacteria will proliferate. Therefore, a wastewater treatment system typically includes an anaerobic pretreatment process, especially... In the treatment of wastewater with high hardness and high organic matter, the anaerobic pretreatment process decomposes complex organic matter into methane and carbon dioxide in the reactor, while organic nitrogen is mineralized and converted into ammonia nitrogen and released into the water, becoming the main substrate for nitrite and anaerobic ammonia oxidation reactions. However, the calcium ions in the wastewater will combine with the carbonate ions generated during the anaerobic pretreatment process and calcify on the surface or inside of the granular sludge, which will lead to faster settling speed of the granular sludge, hindered mass transfer, and thus reduced treatment efficiency or quality, affecting the subsequent nitrite and anaerobic ammonia oxidation reactions. Summary of the Invention

[0003] Therefore, the technical problem this invention aims to solve is to overcome the calcification of sludge particles in existing technologies, and proposes a highly efficient anaerobic ammonia oxidation wastewater treatment system. Through multi-directional controllable water distribution and synergistic hierarchical intervention using ultrasonic energy fields, the system actively maintains the health of the anaerobic granular sludge bed, fundamentally solving the calcification problem. Simultaneously, through energy recovery and utilization and the enhancement of subsequent processes with magnetic carriers, a fully optimized system from front-end pretreatment to end-stage deep denitrification is formed, significantly improving the process's treatment efficiency, operational stability, and energy economy.

[0004] To solve the above-mentioned technical problems, the present invention provides a high-efficiency anaerobic ammonia oxidation wastewater treatment system, comprising:

[0005] The anaerobic ammonia pretreatment reactor is filled with anaerobic granular sludge to treat organic matter in wastewater.

[0006] The nitrite-anaerobic ammonia oxidation reactor is connected to the outlet of the anaerobic ammonia pretreatment reactor. It converts some of the ammonia nitrogen in the water into nitrite before carrying out the anaerobic ammonia oxidation denitrification reaction.

[0007] The bottom of the anaerobic ammonia pretreatment reactor is equipped with a water distribution assembly, which includes:

[0008] The first water distribution branch has its outflow direction set vertically upward;

[0009] The second water distribution branch has its outflow direction set to a clockwise tangential direction toward the inner wall of the anaerobic ammonia pretreatment reactor.

[0010] The third water distribution branch has its outflow direction set to be a counterclockwise tangent towards the inner wall of the ammonia pretreatment reactor.

[0011] Among them, the second and third water distribution branches, by adjusting the flow ratio, cooperate with the first water distribution branch to cause the anaerobic granular sludge bed inside the anaerobic ammonia pretreatment reactor to peristally diffuse from the center of the anaerobic ammonia pretreatment reactor to its inner wall.

[0012] In one embodiment of the present invention, an ultrasonic transducer is provided on the outside of the anaerobic ammonia pretreatment reactor at the lower level of the anaerobic granular sludge bed corresponding to the anaerobic ammonia pretreatment reactor.

[0013] The ultrasonic transducer is an arc-shaped ultrasonic array, including high-frequency ultrasonic generators and low-frequency ultrasonic generators arranged in a uniform and staggered manner.

[0014] In one embodiment of the present invention, when the sludge bed expansion rate is above 80% of the preset target value, the first water distribution branch is always open, the second water distribution branch and the third water distribution branch maintain a low flow rate, and the ultrasonic transducer is in a low power standby state.

[0015] The flow rate configuration for the first, second, and third water distribution branches is: first water distribution branch flow rate > second water distribution branch flow rate = third water distribution branch flow rate.

[0016] In one embodiment of the present invention, when the sludge bed expansion rate decreases, the flow rate of the first water supply branch is reduced, the flow rate of the second or third water distribution branch is increased, and the high-frequency ultrasonic generator is activated at the same time.

[0017] In one embodiment of the present invention, the criterion for determining the decrease in sludge bed expansion rate is:

[0018] When the sludge bed expansion rate is lower than 80% of the target value, higher than 60% of the target value, and the duration exceeds the set threshold, it is determined that a downward trend has occurred;

[0019] At this time, the flow rates of the first water distribution branch, the second water distribution branch, and the third water distribution branch are configured to alternate between the flow rates of the first water distribution branch, the second water distribution branch, and the third water distribution branch, or the flow rates of the first water distribution branch, the third water distribution branch, and the second water distribution branch.

[0020] In one embodiment of the present invention, when the sludge bed expansion rate is less than 60% of the target set value, the second water distribution branch and the third water distribution branch are switched alternately at high frequency, and the low frequency ultrasonic generator is started simultaneously.

[0021] The flow rate configuration of the first water distribution branch, the second water distribution branch, and the third water distribution branch is to alternate between the flow rate of the first water distribution branch < the flow rate of the second water distribution branch < the flow rate of the third water distribution branch or the flow rate of the first water distribution branch < the flow rate of the third water distribution branch < the flow rate of the second water distribution branch.

[0022] In one embodiment of the invention, a heat exchanger is further included, which is connected between the outlet of the anaerobic ammonia pretreatment reactor and the inlet of the nitrite-anaerobic ammonia oxidation reactor.

[0023] In one embodiment of the invention, the heat exchanger has a micro-heating unit, and the outlet of the anaerobic ammonia pretreatment reactor is connected to the inlet of the micro-heating unit.

[0024] In one embodiment of the present invention, the nitrite-anaerobic ammonia oxidation reactor is divided into an aerobic zone, an anaerobic zone and a sedimentation zone. The bottom of the aerobic zone is a water inlet connected to a heat exchanger, and the aerobic zone is filled with a magnetic fluidized bed with an aeration structure at the bottom.

[0025] The upper part of the sedimentation zone has a drain outlet and a return outlet, with the return outlet connected to the water inlet via a return pipe.

[0026] In one embodiment of the present invention, the magnetic fluidized bed uses biochar with magnetic nanoparticles loaded on its surface as a carrier, and an electromagnetic induction trapping ring is provided in the aerobic zone to actively intercept ammonia oxidation granular sludge in the aerobic zone.

[0027] Compared with the prior art, the above-described technical solution of the present invention has the following advantages:

[0028] The present invention discloses a high-efficiency anaerobic ammonia oxidation wastewater treatment system. Through a structural water distribution design, it sets up three multi-channel water distribution with different flow directions: a first water distribution branch vertically upward, a second water distribution branch tangentially clockwise, and a third water distribution branch tangentially counterclockwise. By adjusting the water flow ratio of the three water distribution branches, such as by adjusting the flow ratio of the second and third water distribution branches, combined with the upflow effect of the first water distribution branch, a controllable flow field that can peristally diffuse from the center of the reactor to the sidewalls can be generated in the reactor. This can gently and continuously knead the anaerobic ammonia granular sludge bed, causing relative movement between particles and between particles and water flow. The friction or shear force generated by the movement effectively peels off or prevents the adhesion of calcium carbonate particles to the surface, maintaining particle activity. Attached Figure Description

[0029] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein...

[0030] Figure 1 This is a system diagram of the present invention;

[0031] Figure 2 This is a system diagram from another perspective of the present invention;

[0032] Figure 3 This is a schematic diagram of the water distribution component structure of the present invention;

[0033] Figure 4 This is a schematic diagram of water distribution control when the sludge bed expansion rate is good;

[0034] Figure 5 This is a schematic diagram of water distribution control when the sludge bed expansion rate drops to 60%-80%;

[0035] Figure 6 This is a schematic diagram of water distribution control when the sludge bed expansion rate drops below 60%.

[0036] Figure 7 This is a schematic cross-sectional view of the nitrite-anaerobic ammonia oxidation reactor of the present invention.

[0037] Explanation of reference numerals in the accompanying drawings: 1. Anaerobic ammonia pretreatment reactor; 2. Nitrite-anaerobic ammonia oxidation reactor; 21. Aerobic zone; 211. Aeration structure; 212. Magnetic nanoparticles; 213. Electromagnetic induction trapping coil; 22. Anaerobic zone; 23. Sedimentation zone; 231. Drain outlet; 232. Return outlet; 31. First water distribution branch; 32. Second water distribution branch; 33. Third water distribution branch; 4. Ultrasonic transducer; 41. High-frequency ultrasonic generator; 42. Low-frequency ultrasonic generator; 5. Heat exchanger; 51. Micro-heating unit. Detailed Implementation

[0038] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0039] In existing technologies, when treating wastewater with high organic matter and high hardness, pretreatment (such as anaerobic granular sludge bed reactors) is required to remove complex organic matter in the wastewater that can damage nitrifying bacteria and anaerobic ammonia oxidizing bacteria and has toxic effects. At the same time, organic nitrogen is converted into ammonia nitrogen to provide substrate for subsequent processes. During the anaerobic pretreatment process, the decomposition of organic matter will generate a large number of carbonate ions. Calcium ions that are present in the influent or released during the reaction will combine with carbonate ions to form calcium carbonate precipitates. These calcium carbonate precipitates adhere to the surface of the anaerobic granular sludge or block the pores of the reactor, which will lead to a decrease in the activity of the granular sludge and thus hinder mass transfer, making it difficult for microorganisms to contact the substrate, thereby reducing treatment efficiency. Furthermore, due to the increased weight and excessive compaction of the granular sludge, the settling speed is fast, which prevents the fluidized bed from being in a good expansion state and maintains a stable treatment state during wastewater treatment. As a result, harmful substances that endanger subsequent treatment may still exist in the treated effluent.

[0040] To address the aforementioned issues, common treatment methods include chemical softening, which involves adding chemicals to remove calcium ions. However, this method requires extremely precise control of the chemical dosage and is costly. Another method involves periodically discharging calcified sludge from the bottom of the reactor and replenishing it with fresh sludge when calcification occurs in the sludge bed. However, due to the different treatment efficiencies between the existing sludge and fresh sludge in the reactor, the biomass cannot be stably controlled using this method.

[0041] Based on the above problems, one approach to wastewater calcification and sedimentation treatment is to utilize a stirred sludge bed to ensure uniform mixing of the sludge within the reactor, guaranteeing consistent treatment efficiency and preventing severe calcification stratification. Therefore, this invention proposes a high-efficiency anaerobic ammonia oxidation wastewater treatment system, referring to... Figure 1 , 2 As shown in Figure 3, it includes: an anaerobic ammonia pretreatment reactor 1, which is filled with anaerobic granular sludge for treating organic matter in wastewater;

[0042] Nitrite-anaerobic ammonia oxidation reactor 2 is connected to the outlet of anaerobic ammonia pretreatment reactor 1. It converts some of the ammonia nitrogen in the water into nitrite before carrying out anaerobic ammonia oxidation denitrification reaction.

[0043] The bottom of the anaerobic ammonia pretreatment reactor 1 is equipped with a water distribution assembly, which includes:

[0044] The first water distribution branch 31 has its outflow direction set vertically upward;

[0045] The second water distribution branch 32 has its outflow direction set to a clockwise tangential direction toward the inner wall of the anaerobic ammonia pretreatment reactor 1.

[0046] The third water distribution branch 33 has its outflow direction set to a counterclockwise tangential direction toward the inner wall of the ammonia pretreatment reactor.

[0047] Among them, the second water distribution branch 32 and the third water distribution branch 33, by adjusting the flow ratio, cooperate with the first water distribution branch 31 to cause the anaerobic granular sludge bed inside the anaerobic ammonia pretreatment reactor 1 to peristaltically diffuse from the center of the anaerobic ammonia pretreatment reactor 1 to its inner wall.

[0048] The core of this solution lies in proposing a logic for proactively intervening and dynamically regulating the anaerobic ammonia granular sludge bed to maintain it in a healthy state:

[0049] Specifically, through a structural water distribution design, three different flow directions are set up for multi-channel water distribution: a vertically upward first water distribution branch 31, a clockwise tangential second water distribution branch 32, and a counterclockwise tangential third water distribution branch 33. By adjusting the water flow ratio of the three water distribution branches, such as by adjusting the flow ratio of the second water distribution branch 32 and the third water distribution branch 33, combined with the upflow effect of the first water distribution branch 31, a controllable flow field that can peristally diffuse from the center of the reactor to the side wall can be generated in the reactor. This can gently and continuously knead the anaerobic ammonia granular sludge bed, causing relative movement between particles and between particles and water flow. The friction or shear force generated by the movement can effectively peel off or prevent the adhesion of calcium carbonate particles to the surface, thus maintaining the activity of the particles.

[0050] Following the above method, even if calcium carbonate still adheres to the particles, there will be no excessive calcification of some particles. This ensures the overall expansion rate of the sludge bed, allowing the sludge bed to expand in a uniform and slow process rather than a layered process (e.g., from bottom to top, the bottom layer is severely calcified, the middle layer is partially calcified, and the top layer is in good condition).

[0051] In one implementation, the system includes an anaerobic ammonia pretreatment reactor 1 and a nitrite-anaerobic ammonia oxidation reactor 2 connected in series. At the bottom of the anaerobic ammonia pretreatment reactor 1, a water distributor is arranged, which is divided into the above three controllable water distribution branches: the first water distribution branch 31 discharges water vertically upward, mainly providing the upflow force that can expand the sludge bed; the second water distribution branch 32 and the third water distribution branch 33 discharge water along the inner wall of the anaerobic ammonia pretreatment reactor 1 clockwise and counterclockwise tangents, respectively, applying rotational shear force under the original upflow force.

[0052] By controlling the PLC, the valve openings of the second water distribution branch 32 and the third water distribution branch 33 are adjusted to change their flow ratio. When the flow rates are the same, the rotational forces cancel each other out, mainly enhancing the turbulence. When the flow rates are unequal, a rotational torque is generated inside the reactor, which drives the water flow and sludge bed to rotate in a specific direction. Combined with the vertically upward water flow at the center and a small reverse turbulence, the sludge bed achieves the effect of creeping and diffusing from the center to the side wall of the reactor.

[0053] The above solution proposes a way to avoid sludge bed calcification and stratification. However, in the long run, complete settling will still occur until the treatment efficiency is insufficient to treat the wastewater. This is because the calcification process usually starts in the high-load zone and high-carbonate zone at the bottom of the sludge bed. Even if the sludge bed is homogenized, stratification and settling will still occur in the long run. The above homogenization process only postpones this process.

[0054] Therefore, it is necessary to eliminate calcification as a contributing factor at its source. Hence, this solution proposes a targeted approach for calcified particles, such as... Figure 1 , 2 As shown, an ultrasonic transducer 4 is installed on the outside of the anaerobic ammonia pretreatment reactor, corresponding to the lower layer height of the anaerobic granular sludge bed in the anaerobic ammonia pretreatment reactor 1.

[0055] The ultrasonic transducer 4 is an arc-shaped ultrasonic array, including a high-frequency ultrasonic generator 41 and a low-frequency ultrasonic generator 42 arranged in a uniform and staggered manner.

[0056] The high-frequency ultrasonic generator 41 of the ultrasonic transducer 4 is used to treat the micropores on the surface of the sludge particles. This is because the high-frequency ultrasonic energy is low, and it mainly generates microflow and has a weak cavitation effect when running. It is used to clean the micropores on the surface of the particles and promote mass transfer.

[0057] The low-frequency ultrasonic generator 42 of the ultrasonic transducer 4 is used to peel off the thick calcification layer attached to the sludge particles. This is because the energy is high and the cavitation effect is strong, which can generate stronger mechanical shear force to peel off the thick calcification layer or break up the sludge clumps that have begun to harden.

[0058] Simultaneously, in conjunction with the peristaltic diffusion effect in the previous scheme, the sludge bed inside the anaerobic ammonia pretreatment reactor 1 is thoroughly cleaned. This is because the transmission of ultrasonic energy in the medium gradually decreases with distance, and the anaerobic ammonia pretreatment reactor 1 is usually designed to be relatively large. Therefore, the sludge particles in the center need to move closer to the inner wall of the anaerobic ammonia pretreatment reactor 1 through peristaltic diffusion, that is, closer to the position with higher ultrasonic energy. This is more conducive to the thorough treatment of calcification.

[0059] Based on the above structural design and the principle of sludge particle calcification treatment, corresponding control actions are proposed, such as... Figure 1-6 As shown, when the sludge bed expansion rate is above 80% of the preset target value, the first water distribution branch 31 is normally open, the second water distribution branch 32 and the third water distribution branch 33 maintain a low flow rate, and the ultrasonic transducer 4 is in a low-power standby state.

[0060] Among them, the flow configuration of the first water distribution branch 31, the second water distribution branch 32 and the third water distribution branch 33 is as follows: flow of the first water distribution branch 31 > flow of the second water distribution branch 32 = flow of the third water distribution branch 33;

[0061] When the sludge bed expansion rate decreases, reduce the flow rate of the first water supply branch, increase the flow rate of the second water distribution branch 32 or the third water distribution branch 33, and simultaneously start the high-frequency ultrasonic generator 41.

[0062] The criteria for judging the decrease in sludge bed expansion rate are as follows:

[0063] When the sludge bed expansion rate is lower than 80% of the target value, higher than 60% of the target value, and the duration exceeds the set threshold, it is determined that a downward trend has occurred;

[0064] At this time, the flow rates of the first water distribution branch 31, the second water distribution branch 32, and the third water distribution branch 33 are configured to alternate between the flow rate of the first water distribution branch 31 > the flow rate of the second water distribution branch 32 > the flow rate of the third water distribution branch 33, or the flow rate of the first water distribution branch 31 > the flow rate of the third water distribution branch 33 > the flow rate of the second water distribution branch 32.

[0065] When the sludge bed expansion rate is less than 60% of the target set value, the second water distribution branch 32 and the third water distribution branch 33 are switched alternately at high frequency, and the low frequency ultrasonic generator 42 is started simultaneously.

[0066] The flow rate configuration of the first water distribution branch 31, the second water distribution branch 32, and the third water distribution branch 33 is to alternate between the flow rate of the first water distribution branch 31 < the flow rate of the second water distribution branch 32 < the flow rate of the third water distribution branch 33 or the flow rate of the first water distribution branch 31 < the flow rate of the third water distribution branch 33 < the flow rate of the second water distribution branch 32.

[0067] In this scheme, the health status of the system is judged based on the expansion rate of the sludge bed:

[0068] The sludge bed expansion rate is monitored by an online sludge concentration meter or differential pressure sensor. If it is stable at more than 80% of the preset target value, it indicates that the system is operating healthily. At this time, it is only necessary to ensure that the anaerobic ammonia particles in the sludge bed can maintain the expansion height inside the anaerobic ammonia pretreatment reactor 1, that is, to ensure that the first water distribution branch 31 is always open to provide basic upflow force, and the second water distribution branch 32 and the third water distribution branch 33 maintain a small opening to avoid blocking the outlet.

[0069] If the sludge expansion rate decreases, falling below 80% of the preset target value but exceeding 60% of the preset target value, and this state continues for more than a preset time period, it indicates that the system is already in a state of relatively severe calcification. At this time, the high-frequency ultrasonic generator 41 is activated to clean the internal pores of the particles by using microflow and weakened cavitation effects, and in conjunction with the water flow state, prevent the calcification of the particles from deepening further.

[0070] At this time, the flow rate of the first water distribution branch 31 is reduced, and the flow rate of either the second water distribution branch 32 or the third water distribution branch 33 is increased. The swirling flow formed by the water flow of the second water distribution branch 32 and the third water distribution branch 33 generates rotational shear force. During this process, the particles will gradually approach the inner wall of the anaerobic ammonia pretreatment reactor 1 and then enter the optimal energy zone of the high-frequency ultrasonic generator 41 to clean the internal pores of the particles. The cleaned calcified components are carried out with the water flow.

[0071] If the expansion rate of the sludge bed has dropped to below 60% of the preset target value, it indicates that the sludge bed calcification is very serious and requires stronger treatment methods. At this time, it is necessary to switch the second water distribution branch 32 and the third water distribution branch 33 at high frequency, and at the same time, further increase the flow supply of the two water distribution branches to form a strong, rapidly alternating rotational shear force in the anaerobic ammonia pretreatment reactor 1. At the same time, the low-frequency ultrasonic generator 42 is started to physically break up and peel off the already hardened sludge clumps by utilizing its strong cavitation effect and shear force.

[0072] The above treatment can effectively solve the problem of decreased sludge particle treatment efficiency caused by calcification layer adhesion. In addition, if the decrease in sludge bulking rate occurs in a short period of time, it indicates a drastic change in water quality, such as a sudden increase in calcium ion concentration or a sudden increase in carbonate yield due to changes in organic matter composition. In this case, online calcium ion monitoring instruments and online pH monitoring instruments can be deployed at the inlet port or key reaction zone of anaerobic ammonia pretreatment reactor 1. When drastic changes are detected, preventive control is implemented, and the current water distribution strategy is adjusted to a control strategy that is designed for when the bulking rate has dropped to below 60% of the preset target value. Chemical intervention is also introduced. It should be noted that chemical intervention needs to be precisely controlled to avoid damaging the original system environment.

[0073] After the pretreatment step, the organic components harmful to nitrite-oxidizing bacteria or anaerobic ammonia-oxidizing bacteria have been removed. At this point, the treated wastewater is sent to the subsequent nitrite-anaerobic ammonia oxidation reactor 2, such as... Figure 1 , 2 As shown, it also includes a heat exchanger 5, which is connected between the outlet of the anaerobic ammonia pretreatment reactor 1 and the inlet of the nitrite-anaerobic ammonia oxidation reactor 2. The heat exchanger 5 has a micro heating unit 51, and the outlet of the anaerobic ammonia pretreatment reactor 1 is connected to the inlet of the micro heating unit 51.

[0074] The core of this scheme is to use the methane produced by the anaerobic ammonia pretreatment reactor 1 to provide suitable temperature conditions for the subsequent denitrification process. Since anaerobic ammonia oxidizing bacteria operate at 30-40℃, the heat exchanger 5 can be used directly as a transfer point and wastewater passage. At the same time, the energy of methane is used to exchange the heat of methane combustion into the wastewater. In this way, after the wastewater enters the nitrite-anaerobic ammonia oxidation reactor 2, it can be in an optimal reaction environment, thereby improving the treatment efficiency.

[0075] In addition, the gas generated in the anaerobic ammonia pretreatment reactor 1 can be purified and stored before being used as a raw material for heating in the heat exchanger 5. This only requires adding dedicated purification and storage equipment to the system.

[0076] The nitrite-anaerobic ammonia oxidation reactor 2 is designed as an integrated structure, such as... Figure 7 As shown, the nitrite-anaerobic ammonia oxidation reactor 2 is divided into an aerobic zone 21, an anaerobic zone 22 and a sedimentation zone 23. The bottom of the aerobic zone 21 is the water inlet, which is connected to the heat exchanger 5. The aerobic zone 21 is filled with a magnetic fluidized bed and an aeration structure 211 is set at the bottom.

[0077] The upper part of the sedimentation zone 23 has a drain outlet 231 and a return outlet 232, wherein the return outlet 232 is connected to the water inlet through a return pipe;

[0078] The magnetic fluidized bed uses biochar with magnetic nanoparticles 212 loaded on its surface as a carrier, and the aerobic zone 21 is equipped with an electromagnetic induction trapping ring 213 to actively intercept ammonia oxidation granular sludge in the aerobic zone 21.

[0079] That is, the interior is divided into an aerobic zone 21 (for nitrification), an anaerobic zone 22 (for anaerobic ammonia oxidation), and a sedimentation zone 23. The core of this solution is to solve the problem of functional bacteria being easily lost with the water flow. This is achieved by changing the carrier and using biochar with magnetic nanoparticles 212 loaded on its surface, in conjunction with an electromagnetic induction trapping ring 213 set in the aerobic zone 21. Through program control, an electric field is generated to actively adsorb and trap the magnetic carrier loaded with functional bacteria that may be lost with the water flow in the aerobic zone 21, greatly improving the bacterial retention.

[0080] In summary, this invention provides an intelligent and efficient anaerobic ammonia oxidation treatment scheme for organic wastewater with high hardness and high organic matter content. Through multi-directional controllable water distribution and synergistic hierarchical intervention of ultrasonic energy fields, it actively maintains the healthy state of the anaerobic granular sludge bed, fundamentally solving the calcification problem. At the same time, through energy recovery and utilization and the strengthening of magnetic carriers in subsequent processes, it forms a fully optimized system from front-end pretreatment to end-end deep denitrification, significantly improving the process's treatment efficiency, operational stability, and energy economy.

[0081] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A high-efficiency anaerobic ammonia oxidation wastewater treatment system, characterized in that, include: The anaerobic ammonia pretreatment reactor is filled with anaerobic granular sludge to treat organic matter in wastewater. The nitrite-anaerobic ammonia oxidation reactor is connected to the outlet of the anaerobic ammonia pretreatment reactor. It converts some of the ammonia nitrogen in the water into nitrite before carrying out the anaerobic ammonia oxidation denitrification reaction. The anaerobic ammonia pretreatment reactor is equipped with a water distribution assembly at its bottom, the water distribution assembly comprising: The first water distribution branch has its outflow direction set vertically upward; The second water distribution branch has its outflow direction set to a clockwise tangential direction toward the inner wall of the anaerobic ammonia pretreatment reactor. The third water distribution branch has its outflow direction set to a counterclockwise tangential direction toward the inner wall of the oxygen-ammonia pretreatment reactor. An ultrasonic transducer is installed on the outside of the anaerobic ammonia pretreatment reactor, corresponding to the lower layer of the anaerobic granular sludge bed in the anaerobic ammonia pretreatment reactor. Specifically, based on the ratio between the sludge bed expansion rate and the preset target value, the on / off state and flow ratio of the first, second, and third water distribution branches are adjusted, and the working state of the ultrasonic transducer is switched synchronously, so that the anaerobic granular sludge bed inside the anaerobic ammonia pretreatment reactor undergoes peristaltic diffusion from the center of the anaerobic ammonia pretreatment reactor to its inner wall.

2. The high-efficiency anaerobic ammonia oxidation wastewater treatment system according to claim 1, characterized in that: The ultrasonic transducer is an arc-shaped ultrasonic array, including high-frequency ultrasonic generators and low-frequency ultrasonic generators arranged in a uniform and staggered manner.

3. The high-efficiency anaerobic ammonia oxidation wastewater treatment system according to claim 2, characterized in that: When the sludge bed expansion rate is above 80% of the preset target value, the first water distribution branch is always open, the second water distribution branch and the third water distribution branch maintain a low flow rate, and the ultrasonic transducer is in a low-power standby state. The flow rate configuration of the first water distribution branch, the second water distribution branch, and the third water distribution branch is as follows: flow rate of the first water distribution branch > flow rate of the second water distribution branch = flow rate of the third water distribution branch.

4. The high-efficiency anaerobic ammonia oxidation wastewater treatment system according to claim 3, characterized in that: When the sludge bed expansion rate decreases, reduce the flow rate of the first water supply branch, increase the flow rate of the second or third water distribution branch, and simultaneously start the high-frequency ultrasonic generator.

5. The high-efficiency anaerobic ammonia oxidation wastewater treatment system according to claim 4, characterized in that: The criteria for judging the decrease in sludge bed expansion rate are as follows: When the sludge bed expansion rate is lower than 80% of the target value, higher than 60% of the target value, and the duration exceeds the set threshold, it is determined that a downward trend has occurred; At this time, the flow rates of the first water distribution branch, the second water distribution branch, and the third water distribution branch are configured to alternate between the flow rates of the first water distribution branch, the second water distribution branch, and the third water distribution branch, or the flow rates of the first water distribution branch, the third water distribution branch, and the second water distribution branch.

6. The high-efficiency anaerobic ammonia oxidation wastewater treatment system according to claim 2, characterized in that: When the sludge bed expansion rate is less than 60% of the target set value, the second water distribution branch and the third water distribution branch are switched alternately at high frequency, and the low frequency ultrasonic generator is started simultaneously. The flow rates of the first water distribution branch, the second water distribution branch, and the third water distribution branch are configured to alternate between the flow rate of the first water distribution branch < the flow rate of the second water distribution branch < the flow rate of the third water distribution branch or the flow rate of the first water distribution branch < the flow rate of the third water distribution branch < the flow rate of the second water distribution branch.

7. The high-efficiency anaerobic ammonia oxidation wastewater treatment system according to claim 1, characterized in that: It also includes a heat exchanger connected between the outlet of the anaerobic ammonia pretreatment reactor and the inlet of the nitrite-anaerobic ammonia oxidation reactor.

8. The high-efficiency anaerobic ammonia oxidation wastewater treatment system according to claim 7, characterized in that: The heat exchanger has a micro-heating unit, and the outlet of the anaerobic ammonia pretreatment reactor is connected to the inlet of the micro-heating unit.

9. The high-efficiency anaerobic ammonia oxidation wastewater treatment system according to claim 7, characterized in that: The nitrite-anaerobic ammonia oxidation reactor is divided into an aerobic zone, an anaerobic zone, and a sedimentation zone. The bottom of the aerobic zone is the water inlet, which is connected to the heat exchanger. The aerobic zone is filled with a magnetic fluidized bed and has an aeration structure at the bottom. The upper part of the sedimentation zone has a drain outlet and a return outlet, wherein the return outlet is connected to the water inlet through a return pipe.

10. The high-efficiency anaerobic ammonia oxidation wastewater treatment system according to claim 9, characterized in that: in, The magnetic fluidized bed uses biochar with magnetic nanoparticles loaded on its surface as a carrier, and an electromagnetic induction trap is set in the aerobic zone to actively intercept ammonia oxidation granular sludge in the aerobic zone.

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