An anaerobic ammonia oxidation wastewater treatment system and method based on electromagnetic field regulation

Abstract

The application discloses an anaerobic ammonia oxidation wastewater treatment system and method based on electromagnetic field regulation and control, and the system comprises a high-efficiency carbon and phosphorus removal reactor, an intermediate pool, an integrated anaerobic ammonia oxidation reactor with magnetic biochar, an electromagnetic regulation and control system, a heat management system and a control system which are sequentially connected. The system generates an electromagnetic field through the electromagnetic regulation and control system, uses the electromagnetic field to affect bacterial strains, intervenes in the water environment of the integrated anaerobic ammonia oxidation reactor, realizes inhibition of the activity of nitrite oxidizing bacteria, maintains or promotes the activity of ammonia oxidizing bacteria, and stabilizes short-cut nitrification. Meanwhile, the electromagnetic field cooperates with the magnetic biochar, can use electromagnetic induction to heat the magnetic biochar, heats the water environment, simultaneously ensures the suitable temperature of the bacterial strains, and solves the two bottlenecks of low-temperature activity inhibition and short-cut nitrification instability of the anaerobic ammonia oxidation process, so that the anaerobic ammonia oxidation system can stably operate under low-temperature and low-substrate conditions.

Description

Technical Field

[0001] This invention belongs to the field of wastewater treatment technology, and more specifically, relates to an anaerobic ammonia oxidation wastewater treatment system and method based on electromagnetic field control. Background Technology

[0002] With increasingly stringent environmental protection requirements, the energy consumption and carbon emissions of wastewater treatment have attracted significant attention. Traditional nitrification-denitrification denitrification processes have inherent drawbacks such as the need for additional organic carbon sources, high energy consumption, and large amounts of residual sludge. Against this backdrop, anaerobic ammonia oxidation technology, as a revolutionary autotrophic denitrification technology, has become a leading force and direction in the field of wastewater denitrification due to its significant advantages, including no need for organic carbon sources, a reduction in oxygen consumption of approximately 60%, low sludge production, and the elimination of the need for external carbon sources.

[0003] Despite its significant advantages, anammox technology faces two major technical bottlenecks in practical applications. First, the instability of short-cut nitrification under low-load conditions. A crucial prerequisite for successful anammox is a stable and efficient pre-treatment of short-cut nitrification, converting approximately half of the ammonia nitrogen into nitrite. However, under low ammonia nitrogen and low-load conditions, nitrite-oxidizing bacteria (NOBs) are difficult to suppress stably and for extended periods. Excessive NOB proliferation leads to further oxidation of nitrite into nitrate, disrupting the ideal substrate ratio required for anammox and causing subsequent anammox reactions to fail due to substrate imbalance. Ultimately, this results in a decrease or even collapse of the entire process chain's denitrification efficiency. Second, the low-temperature inertia of anammox bacteria. Anammox bacteria grow slowly, have long doubling times, and are sensitive to temperature changes. When the temperature drops below 20°C, their metabolic activity decreases exponentially. However, in many actual wastewater treatment scenarios, water temperatures often remain below this critical value for extended periods due to seasonal or geographical factors. This low-temperature environment severely restricts the activity and reproduction rate of anaerobic ammonia-oxidizing bacteria, leading to a sharp deterioration in reactor treatment efficiency and making it difficult to maintain stable denitrification performance, thus becoming a common obstacle to the stable operation of this technology. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing an anaerobic ammonia oxidation wastewater treatment system based on electromagnetic field control. This system solves the problems mentioned in the background art, such as the difficulty in achieving stable short-cut nitrification under low load conditions and the significant decrease in the activity of anaerobic ammonia oxidizing bacteria under low temperature conditions. The goal is to achieve the technical effect of efficient and stable operation of the short-cut nitrification anaerobic ammonia oxidation system under low temperature and low load conditions.

[0005] To achieve the above objectives, the present invention provides an anaerobic ammonia oxidation wastewater treatment system based on electromagnetic field control, comprising: The high-efficiency carbon and phosphorus removal reactor, the intermediate water tank, and the integrated anaerobic ammonia oxidation reactor are connected in sequence. The integrated anaerobic ammonia oxidation reactor is equipped with magnetic biochar, which is used for microbial attachment. An electromagnetic control system is used to generate an alternating electromagnetic field in the reaction zone inside the integrated anaerobic ammonia oxidation reactor, so that the magnetic biochar added therein can absorb electromagnetic energy and generate a thermal effect. A thermal management system, wherein the heat source side of the thermal management system is connected to the waste heat source, and the heating side is connected to the intermediate water tank and / or the integrated anaerobic ammonia oxidation reactor, for preheating and heat preservation of the integrated anaerobic ammonia oxidation reactor; The control system is electrically connected to the electromagnetic control system and the thermal management system, and adjusts the operating status of the electromagnetic control system and the thermal management system based on feedback from sensors inside the integrated anaerobic ammonia oxidation reactor.

[0006] Optionally, the thermal management system includes: The water source heat pump unit and / or heat exchanger unit are connected to the secondary effluent pipeline of the plant and / or the anaerobic digestion waste heat source on the heat source side, and to the inlet pipeline leading to the integrated anaerobic ammonia oxidation reactor and the intermediate water tank on the heating side.

[0007] Optionally, at least three temperature sensors are distributed inside the integrated anaerobic ammonia oxidation reactor, with one of them located in the region with the highest electromagnetic field strength.

[0008] Optionally, the electromagnetic control system includes a high-frequency power generator, an electromagnetic coil, and a cooling water circulation unit.

[0009] Optionally, the tank of the integrated anaerobic ammonia oxidation reactor is a non-magnetic insulated tank.

[0010] Optionally, the sensors inside the integrated anaerobic ammonia oxidation reactor are electromagnetically compatible sensors.

[0011] This invention also provides a method for treating anaerobic ammonia oxidation wastewater based on electromagnetic field control, utilizing the aforementioned anaerobic ammonia oxidation wastewater treatment system based on electromagnetic field control, comprising: The high-efficiency carbon and phosphorus removal reactor operates in a sequencing batch process to remove most of the organic matter and phosphorus from the influent, and the effluent is discharged into an intermediate water tank. The integrated anaerobic ammonia oxidation reactor is fed into an intermediate water tank and operates in a sequential batch mode. Its water environment is adjusted to ensure that the nitrite accumulation rate is greater than 85% and the water temperature is maintained at 20~35℃. Electromagnetic fields are intermittently applied during the reaction stage of the integrated anaerobic ammonia oxidation reactor, and the electromagnetic field parameters are adjusted according to the water environment, including: If the temperature is below the preset range, the electromagnetic control system will operate with the first parameter to raise the temperature. If the temperature is within the preset range and the NOB activity is controlled, it will operate with the second parameter for heat preservation. If the temperature is within the preset range and the nitrite accumulation rate continues to decrease for at least 1 hour, the system will operate with the third parameter for electromagnetic field strength control of non-thermal effects.

[0012] Optionally, if the temperature is below a preset range, the method further includes: controlling the operation of the thermal management system to heat the influent to the integrated anaerobic ammonia oxidation reactor through the thermal management system.

[0013] Optionally, the third parameter includes an electromagnetic field strength of 15~60 mT and a pulse frequency of 10 kHz~500 kHz.

[0014] Optionally, it also includes: If the temperature at any point within the electromagnetic field exceeds the first safety threshold, the electromagnetic field power will be automatically reduced or its operation will be suspended. If the temperature continues to rise and reaches a higher second safety threshold, the electromagnetic field will be immediately shut off, and an audible and visual alarm signal will be triggered. At the same time, the fault information will be uploaded to the control system.

[0015] This invention provides an anaerobic ammonia oxidation wastewater treatment system based on electromagnetic field control, the advantages of which are: 1. This anaerobic ammonia oxidation wastewater treatment system based on electromagnetic field control generates an electromagnetic field through an electromagnetic control system. This electromagnetic field influences the bacterial strains and intervenes in the aquatic environment of the integrated anaerobic ammonia oxidation reactor, thereby inhibiting the activity of nitrite-oxidizing bacteria, maintaining or promoting the activity of ammonia-oxidizing bacteria, and ultimately stabilizing short-cut nitrification. Simultaneously, the electromagnetic field, in conjunction with magnetic biochar, can use electromagnetic induction to heat the magnetic biochar, heating the aquatic environment while prioritizing the maintenance of a suitable temperature for the bacterial strains. This keeps the strains within a certain temperature range, reducing thermal damage to the bacteria compared to introducing hot water or other heat sources.

[0016] 2. This system utilizes precise electromagnetic field control to synergistically address the bottlenecks of short-range nitrification stability and low-temperature activity. Through its control system, the electromagnetic field transcends its single heating function, achieving precise regulation of the microbial community. Furthermore, the control system automatically switches to different electromagnetic field modes to ensure the stable accumulation of nitrite nitrogen, providing a precise substrate ratio for subsequent anaerobic ammonium oxidation reactions.

[0017] 3. The magnetic biochar in this solution serves as a multifunctional medium, acting as both a biological carrier and a micro-zone heater. It not only provides a preferential attachment framework for functional microorganisms such as anaerobic ammonia oxidizing bacteria, significantly accelerating the formation of high-density, highly active granular sludge and improving system stability, but also enables in-situ micro-zone heating under the influence of an electromagnetic field, directly and efficiently supplying energy at the microbial aggregation point, creating a resilient, warm microenvironment, and synergistically enhancing granulation and micro-zone reactions.

[0018] 4. This invention achieves dual optimization of energy and process through the deep integration of heat recovery and electromagnetic control. The control system systematically integrates waste heat recovery and electromagnetic control. The thermal management system provides gradient preheating of the influent to the integrated anaerobic ammonia oxidation reactor, fulfilling the basic energy requirements and significantly reducing the overall energy consumption of the system. Electromagnetic heating is used as a precise supplement and control method to maintain key temperatures and apply specific biofield effects. This synergistic energy strategy of "waste heat for basic needs, electromagnetic control for precision" ensures excellent treatment results while giving the system high energy and economic feasibility.

[0019] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0020] The above and other objects, features and advantages of the present invention will become more apparent from the more detailed description of exemplary embodiments of the invention in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the invention.

[0021] Figure 1 A schematic diagram of an anaerobic ammonia oxidation wastewater treatment system based on electromagnetic field control according to an embodiment of the present invention is shown.

[0022] Figure 2 A logic diagram of an anaerobic ammonia oxidation wastewater treatment method based on electromagnetic field control according to an embodiment of the present invention is shown.

[0023] Explanation of reference numerals in the attached figures: 1. High-efficiency carbon and phosphorus removal reactor; 2. Intermediate water tank; 3. Integrated anaerobic ammonia oxidation reactor; 4. Electromagnetic control system; 5. Thermal management system. Detailed Implementation

[0024] Preferred embodiments of the invention will now be described in more detail. While preferred embodiments of the invention are described below, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0025] like Figure 1 As shown, an anaerobic ammonia oxidation wastewater treatment system based on electromagnetic field control includes: The high-efficiency carbon and phosphorus removal reactor 1, intermediate water tank 2 and integrated anaerobic ammonia oxidation reactor 3 are connected in sequence. The integrated anaerobic ammonia oxidation reactor 3 is equipped with magnetic biochar, which is used for microbial attachment. Electromagnetic control system 4 is used to generate an alternating electromagnetic field in the reaction zone inside the integrated anaerobic ammonia oxidation reactor 3, so that the magnetic biochar added therein can absorb electromagnetic energy and generate a thermal effect. The thermal management system 5 is connected to the waste heat source on the heat source side and to the inlet / reaction zone of the intermediate water tank 2 and / or the integrated anaerobic ammonia oxidation reactor 3 on the heating side, and is used to preheat and keep the integrated anaerobic ammonia oxidation reactor 3 warm. The control system is electrically connected to the electromagnetic control system 4 and the thermal management system 5. The control system adjusts the operating status of the electromagnetic control system and the thermal management system based on the feedback from the sensors inside the integrated anaerobic ammonia oxidation reactor.

[0026] Specifically, the control system receives monitoring data from sensor arrays located inside and outside the reactor, including at least the reactor temperature. Based on the monitoring data and preset process strategies, it generates control commands and sends these commands to the electromagnetic control system 4 and the thermal management system 5 to adjust their operating status. The electromagnetic control system 4 generates an electromagnetic field, which influences the microbial flora and intervenes in the water environment of the integrated anaerobic ammonia oxidation reactor 3. This inhibits the activity of nitrite-oxidizing bacteria (NOB) while maintaining or promoting the activity of ammonia-oxidizing bacteria (AOB), ultimately stabilizing short-cut nitrification. Simultaneously, the electromagnetic field works in conjunction with magnetic biochar, using electromagnetic induction to heat the biochar and heat the water environment while prioritizing the maintenance of a suitable temperature for the microbial flora. This keeps the flora within a certain temperature range, reducing thermal damage to the flora compared to introducing hot water or a heat source (introducing hot water increases water circulation and dilutes the flora; introducing a heat source damages flora near the heat source).

[0027] The high-efficiency carbon and phosphorus removal reactor 1 and the integrated anaerobic ammonia oxidation reactor 3 are both cylindrical SBR reactors with aeration discs at the bottom, which can provide dissolved oxygen for microbial metabolism.

[0028] Furthermore, the sensors include key indicator sensors such as temperature, DO, pH, MLSS, ammonia nitrogen, nitrite nitrogen, nitrate nitrogen, and orthophosphate, which are arranged in the main reactor.

[0029] Furthermore, after primary treatment to remove suspended solids and sand, the incoming water enters the high-efficiency carbon and phosphorus removal reactor 1 to remove organic matter and phosphorus. The effluent then enters the intermediate water tank 2. The integrated anaerobic ammonia oxidation reactor 3 uses the water source in the intermediate water tank 2, where ammonia nitrogen is the main pollutant, as the influent. It utilizes ammonia-oxidizing bacteria, anaerobic ammonia-oxidizing bacteria, and other main functional bacteria to achieve efficient denitrification through short-cut nitrification coupled with anaerobic ammonia oxidation. The electromagnetic control system 4 uses the electromagnetic field it generates to precisely control the functional bacterial community. At the same time, the magnetocaloric effect of the magnetic medium compensates for the reactor's heat loss, thereby synergistically improving the metabolic activity of the bacterial community and the system's denitrification efficiency under low-temperature conditions.

[0030] In this embodiment, the thermal management system 5 includes: The heat source side of the water source heat pump unit and / or heat exchanger unit is connected to the secondary effluent pipeline of the plant area and / or the anaerobic digestion waste heat source, while its heating side is connected to the inlet pipeline leading to the integrated anaerobic ammonia oxidation reactor 3 and the intermediate water tank 2.

[0031] Specifically, the water temperature of the integrated anaerobic ammonia oxidation reactor 3 is maintained by utilizing waste heat and residual heat, thus saving energy.

[0032] Furthermore, as a preferred closed-loop heat cycle scheme, the heat source side of the water source heat pump unit can also be directly taken from the effluent of the integrated anaerobic ammonia oxidation reactor 3 itself, realizing the direct recovery and reuse of heat energy within the process system.

[0033] Furthermore, the thermal management system 5, as an integrated energy dispatch center, operates in conjunction with the control system to achieve the following collaborative functions: the system prioritizes the use of low-temperature waste heat sources (such as secondary effluent) in the plant area to preheat the influent to the intermediate water tank, thereby reducing overall energy consumption; when preheating is insufficient, the electromagnetic control system 4 is activated as the core heat source to rapidly and accurately raise and maintain the temperature of the integrated anaerobic ammonia oxidation reactor 3; finally, the control system automatically decides and coordinates the start-up, shutdown, and switching of the above-mentioned multiple heat sources based on the principle of optimal real-time water temperature and energy consumption, thereby achieving the intelligent thermal management goals of waste heat priority, electromagnetic precision, and multi-source collaboration.

[0034] In this embodiment, at least three temperature sensors are distributed inside the integrated anaerobic ammonia oxidation reactor 3, with one of them located in the region with the highest electromagnetic field strength.

[0035] Specifically, at least one temperature sensor monitors the area with the highest electromagnetic field strength to avoid localized high temperatures damaging the bacteria, while the remaining temperature sensors are distributed to collect samples at multiple points for monitoring.

[0036] Furthermore, the temperature sampling area should be a location that represents the average temperature of the reactor body, avoiding areas near the inlet, outlet, or localized areas near the reactor wall.

[0037] In this embodiment, the electromagnetic control system 4 includes a high-frequency power generator, an electromagnetic coil, and a cooling water circulation unit.

[0038] Specifically, the parameters and frequency of the high-frequency power generator are adjustable. The electromagnetic coil is either arranged in a loop around the exterior of the integrated anaerobic ammonia oxidation reactor 3 or embedded non-contactly within its insulation layer, used to generate a uniform electromagnetic field throughout the entire reaction zone inside the integrated anaerobic ammonia oxidation reactor 3. The winding density of the electromagnetic coil is optimized based on simulation results of the electromagnetic field distribution inside the integrated anaerobic ammonia oxidation reactor 3 to ensure that the coefficient of variation of the electromagnetic field strength in the core region of the reactor is less than 20%. The cooling water circulation unit includes a cooling water pump, piping, and radiators, used to cool the power supply and electromagnetic coil to prevent overheating.

[0039] In this embodiment, the tank of the integrated anaerobic ammonia oxidation reactor 3 is a non-magnetic insulating tank.

[0040] Specifically, the main body material of the integrated anaerobic ammonia oxidation reactor 3 should be non-magnetic and non-conductive, including the tank and various internal pipelines, to ensure that the alternating electromagnetic field can efficiently and uniformly penetrate the reactor wall and act on the reaction area, such as fiberglass, polyvinyl chloride or high-strength engineering plastics.

[0041] In this embodiment, the sensor inside the integrated anaerobic ammonia oxidation reactor 3 is an electromagnetically compatible sensor.

[0042] Specifically, all sensors in the integrated anaerobic ammonia oxidation reactor 3 are preferably of the type that are insensitive to electromagnetic fields, and non-metallic process connectors and housings are used to ensure that their measurement accuracy and long-term stability are not affected by alternating electromagnetic fields.

[0043] like Figure 2 As shown, the present invention also provides an anaerobic ammonia oxidation wastewater treatment method based on electromagnetic field control, utilizing the above-mentioned anaerobic ammonia oxidation wastewater treatment system based on electromagnetic field control, comprising: The high-efficiency carbon and phosphorus removal reactor 1 operates in a sequencing batch process to remove most of the organic matter and phosphorus from the influent, and the effluent is discharged into the intermediate water tank 2. The integrated anaerobic ammonia oxidation reactor 3 is fed into the intermediate water tank 2 and operates in a sequential batch mode to adjust its water environment so that the nitrite accumulation rate is greater than 85% and the water temperature is maintained at 20~35℃. Electromagnetic fields are intermittently applied during the reaction stage of the integrated anaerobic ammonia oxidation reactor 3, and the electromagnetic field parameters are adjusted according to the water environment, including: If the temperature is lower than the preset range, the electromagnetic control system 4 will operate with the first parameter to raise the temperature. If the temperature is within the preset range and the NOB activity is controlled, it will operate with the second parameter for heat preservation. If the temperature is within the preset range and the nitrite accumulation rate continues to decrease for at least 1 hour, the system will operate with the third parameter for electromagnetic field strength control of non-thermal effects.

[0044] Specifically, an electromagnetic field is generated by the electromagnetic control system 4, which influences the microbial strain and intervenes in the water environment of the integrated anaerobic ammonia oxidation reactor 3. This inhibits the activity of nitrite-oxidizing bacteria, maintains or promotes the activity of ammonia-oxidizing bacteria (AOB), and ultimately stabilizes short-cut nitrification. Simultaneously, in a low-temperature environment, the electromagnetic field, in conjunction with magnetic biochar (e.g., loaded with Fe3O4), can use electromagnetic induction to heat the magnetic biochar, heating the water environment while prioritizing the maintenance of a suitable temperature for the microbial strain. This keeps the strain within a certain temperature range, reducing thermal damage to the strain compared to introducing hot water or a heat source (introducing hot water increases water circulation and dilutes the strain; introducing a heat source damages strains near the heat source). Furthermore, the electromagnetic field is preferably started intermittently. Intermittent start-up avoids excessive heating of the magnetic biochar due to a continuous electromagnetic field and allows the microbial strain to intermittently "rest and recover," facilitating the maintenance of high strain activity.

[0045] Furthermore, the reactor is started when the temperature is below the target value (preferably 20°C) and operates with the first parameter. The first parameter is determined based on the reactor's heat loss and heating rate requirements, and for a reactor with an effective volume of 17 cubic meters, its preferred range is between 10 kW and 30 kW.

[0046] It starts when the temperature reaches the target value and the NOB activity is controlled, and operates with the second parameter. The second parameter is only used to compensate for the heat loss of the system, and its value is significantly lower than the first parameter, preferably 10% to 50% of the first parameter.

[0047] When the temperature reaches the target value and the nitrite accumulation rate shows a continuous decrease for more than 1 hour, it operates with a preset, lower average power and a specific magnetic field strength and frequency range of the third parameter; preferably, the magnetic field strength is set to 15~60 mT and the pulse frequency is set to 10 kHz~500 kHz.

[0048] In this embodiment, if the temperature is lower than the preset range, the method further includes: controlling the operation of the thermal management system 5 to heat the influent of the integrated anaerobic ammonia oxidation reactor 3 through the thermal management system 5.

[0049] Specifically, by increasing the inlet water temperature, the inlet water temperature is brought close to that of the integrated anaerobic ammonia oxidation reactor 3.

[0050] In this embodiment, the third parameter includes an electromagnetic field strength of 15~60 mT and a pulse frequency of 10 kHz~500 kHz.

[0051] Specifically, this parameter combination is designed to achieve selective inhibition using specific non-thermal biological effects. The mechanism involves the electromagnetic field energy at this frequency and intensity specifically interacting with the active sites or electron transport chains of key enzyme systems (such as nitrite oxidoreductase NXR) within nitrite-oxidizing bacteria. By interfering with their conformation and transmembrane ion transport, it preferentially inhibits the metabolic activity of NOB, while having a relatively smaller impact on ammonia-oxidizing bacteria (AOB), thereby stabilizing nitrite nitrogen accumulation. Furthermore, the pulsed intermittent operation mode effectively avoids the development of tolerance in the NOB community and utilizes the faster activity recovery ability of AOB during the intermittent period to enhance NOB inhibition at the population level through periodic selective pressure. On the other hand, this mode significantly reduces the overall operating energy consumption of the system by intermittently stopping energy input, achieving the dual goals of high efficiency, energy saving, and process stability.

[0052] Meanwhile, the electromagnetic field also has a thermal effect, which can heat or insulate the anaerobic ammonium oxidation system. By applying the electromagnetic field and precisely controlling it according to different scenarios, on the one hand, its heating function can overcome the adverse conditions of low temperature; on the other hand, by precisely controlling the microenvironment of the functional microbial community, the short-range nitrification and anaerobic ammonium oxidation processes can be stabilized simultaneously.

[0053] In this embodiment, it also includes: If the temperature at any point within the electromagnetic field exceeds the first safety threshold, the electromagnetic field power will be automatically reduced or its operation will be suspended. If the temperature continues to rise and reaches a higher second safety threshold, the electromagnetic field will be immediately shut off, and an audible and visual alarm signal will be triggered. At the same time, the fault information will be uploaded to the control system.

[0054] Specifically, the first safety threshold is 35℃ and the second safety threshold is 40℃. The safety control strategy avoids local high temperature damage to the bacteria. At the same time, when the temperature exceeds the second safety threshold, the control system automatically executes a diagnostic procedure to investigate and notify manual handling to confirm whether the electromagnetic field is normal.

[0055] This embodiment describes an anaerobic ammonia oxidation wastewater treatment system based on electromagnetic field control, using domestic wastewater as an example: The specific test water was domestic sewage from a certain city, with the following water quality: COD concentration of 300–150 mg / L, ammonia nitrogen concentration of 30–45 mg / L, and TP concentration of 4–8 mg / L. The high-efficiency carbon and phosphorus removal reactor 1, the intermediate water tank 2, and the integrated anaerobic ammonia oxidation reactor 3 are all fiberglass structures. The effective volume of the high-efficiency carbon and phosphorus removal reactor 1 is 17 m³. 3 The effective volume of intermediate pool 2 is 15m³. 3 The integrated anaerobic ammonia oxidation reactor 3 has an effective volume of 20m³. 3 .

[0056] The specific operation and control procedures are as follows: (I) Regulation of high-efficiency carbon and phosphorus removal reactor The high-efficiency carbon and phosphorus removal reactor 1 is inoculated with aerobic granular sludge known for its phosphorus removal effect. It operates for four cycles per day, each cycle consisting of four stages: influent / effluent, reaction, sedimentation, and idle. During the influent / effluent stage, water is fed into the reactor from the bottom via a top-outlet method, with an influent duration of 1.5–2.0 hours. After influent flow, aeration is initiated, controlling dissolved oxygen levels below 0.5 mg / L. Simultaneously, COD and orthophosphate concentrations are monitored, and aeration is stopped when the orthophosphate concentration falls below 0.2 mg / L. Following aeration, the sedimentation stage begins, and sludge discharge is initiated at the upper part of the reactor. This discharge removes some poorly settling sludge, maintaining the sludge age in the high-efficiency carbon and phosphorus removal reactor at 3–8 days, preferably 5 days. Sedimentation and idle times are dynamically allocated based on sludge settling efficiency to ensure a fixed total cycle length.

[0057] (II) Regulation of Integrated Anaerobic Ammonia Oxidation Reactor The integrated anammox reactor 3 is inoculated with short-cut nitrification activated sludge and anammox granular sludge. It operates for four cycles per day, each cycle consisting of four stages: influent / effluent, reaction, sedimentation, and idle. During the influent / effluent stage, water is fed into the reactor from the bottom via a top-outlet method, with an influent duration of 1.0–1.5 hours. After influent flow, aeration is initiated to control dissolved oxygen levels below 0.3 mg / L to avoid inhibiting anammox bacteria. During the reaction stage, ammonia nitrogen, nitrite nitrogen, and nitrate nitrogen in the water are monitored online, and the nitrite accumulation rate (NAR) is calculated. A multi-level synergistic control strategy, integrating DO control, inhibitor dosage, and electromagnetic field regulation, is used to precisely regulate nitrifying bacteria activity, stabilizing the nitrite accumulation rate above 85%. Aeration is stopped when the TN concentration in the integrated anammox reactor 3 falls below 10 mg / L. The sedimentation stage begins after aeration. Sludge discharge begins 10-20 minutes after the sedimentation stage starts. The discharge point is located in the upper part of the reactor. At this time, sludge discharge can wash out some of the poorly settling sludge and NOB. The sedimentation and idle time are dynamically allocated according to the sludge settling effect to ensure that the total cycle time is fixed.

[0058] The electromagnetic control system 4 is activated during the reaction phase, applying an electromagnetic field in a pulsed, intermittent manner (an intermittent operation mode of 10-30 minutes on, 20-35 minutes off), specifically an intermittent operation mode of 20 minutes on, 20 minutes off. Simultaneously, the electromagnetic control system 4 is controlled by the control system, which can automatically select and switch between multiple preset operating modes based on the water temperature and water quality parameters within the integrated anaerobic ammonia oxidation reactor 3. a) Heating mode: Starts when the temperature is below 20°C and operates at the first parameter of 20 kW.

[0059] b) Heat preservation mode: Starts when the temperature reaches 20℃ and NOB activity is controlled, and operates at the second parameter of 4kW.

[0060] c) Suppression mode: When the temperature reaches 20℃ and the nitrite accumulation rate continues to decrease for more than 1 hour, the third parameter is activated, the electromagnetic field strength is set to 20~50 mT, and the pulse frequency is set to 10 kHz~100 kHz.

[0061] (III) Heat Management and Regulation When the control system detects that the influent temperature of the integrated anaerobic ammonia oxidation reactor 3 is too low, and that waste heat from anaerobic digestion or other plant areas is insufficient to preheat the influent to the target temperature, the control system will send a start command to the water source heat pump. Furthermore, the control system can adjust the parameters of the water source heat pump in real time based on the difference between the "target preheating temperature" and the "actual influent temperature." When the temperature difference is large, the water source heat pump operates at high parameters; when the temperature difference is small, the water source heat pump operates at low parameters or is in standby mode.

[0062] The experimental results show that after stable operation, the final effluent COD concentration of the system is 30-40 mg / L, TN < 10 mg / L, and TP < 0.3 mg / L. This proves that the system can be widely used in the treatment of ammonia nitrogen-containing wastewater, and is especially suitable for the efficient treatment of low-ammonia nitrogen wastewater under low-temperature conditions.

[0063] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A wastewater treatment method based on electromagnetic field control, characterized in that, include: The high-efficiency carbon and phosphorus removal reactor, the intermediate water tank, and the integrated anaerobic ammonia oxidation reactor are connected in sequence. The integrated anaerobic ammonia oxidation reactor is equipped with magnetic biochar, which is used for microbial attachment. An electromagnetic control system is used to generate an alternating electromagnetic field in the reaction zone inside the integrated anaerobic ammonia oxidation reactor, so that the magnetic biochar added therein can absorb electromagnetic energy and generate a thermal effect. A thermal management system, wherein the heat source side of the thermal management system is connected to the waste heat source, and the heating side is connected to the intermediate water tank and / or the integrated anaerobic ammonia oxidation reactor, for preheating and heat preservation of the integrated anaerobic ammonia oxidation reactor; The control system is electrically connected to the electromagnetic control system and the thermal management system, and adjusts the operating status of the electromagnetic control system and the thermal management system according to the feedback of the sensors in the integrated anaerobic ammonia oxidation reactor. The high-efficiency carbon and phosphorus removal reactor operates in a sequencing batch process to remove most of the organic matter and phosphorus from the influent, and the effluent is discharged into an intermediate water tank. The integrated anaerobic ammonia oxidation reactor is fed into an intermediate water tank and operates in a sequential batch mode. Its water environment is adjusted to ensure that the nitrite accumulation rate is greater than 85% and the water temperature is maintained at 20~35℃. Electromagnetic fields are intermittently applied during the reaction stage of the integrated anaerobic ammonia oxidation reactor, and the electromagnetic field parameters are adjusted according to the water environment, including: If the temperature is below the preset range, the electromagnetic control system will operate with the first parameter to raise the temperature. If the temperature is within the preset range and the activity of nitrite-oxidizing bacteria is controlled, the second parameter is used for heat preservation. If the temperature is within the preset range and the nitrite accumulation rate continues to decrease for at least 1 hour, the system will operate with the third parameter for electromagnetic field strength control of non-thermal effects. The third parameter includes an electromagnetic field strength of 15~60 mT and a pulse frequency of 10 kHz~500 kHz.

2. The anaerobic ammonia oxidation wastewater treatment method based on electromagnetic field control according to claim 1, characterized in that, The thermal management system includes: The water source heat pump unit and / or heat exchanger unit are connected to the secondary effluent pipeline of the plant and / or the anaerobic digestion waste heat source on the heat source side, and to the inlet pipeline leading to the integrated anaerobic ammonia oxidation reactor and the intermediate water tank on the heating side.

3. The anaerobic ammonia oxidation wastewater treatment method based on electromagnetic field control according to claim 1, characterized in that, The integrated anaerobic ammonia oxidation reactor has at least three temperature sensors distributed inside, one of which is located in the region with the highest electromagnetic field strength.

4. The anaerobic ammonia oxidation wastewater treatment method based on electromagnetic field control according to claim 1, characterized in that, The electromagnetic control system includes a high-frequency power generator, an electromagnetic coil, and a cooling water circulation unit.

5. The anaerobic ammonia oxidation wastewater treatment method based on electromagnetic field control according to claim 1, characterized in that, The tank of the integrated anaerobic ammonia oxidation reactor is a non-magnetic insulated tank.

6. The anaerobic ammonia oxidation wastewater treatment method based on electromagnetic field control according to claim 1, characterized in that, The sensors inside the integrated anaerobic ammonia oxidation reactor are electromagnetically compatible sensors.

7. The anaerobic ammonia oxidation wastewater treatment method based on electromagnetic field control according to claim 1, characterized in that, If the temperature is below the preset range, the method further includes: controlling the operation of the thermal management system to heat the influent to the integrated anaerobic ammonia oxidation reactor through the thermal management system.

8. The anaerobic ammonia oxidation wastewater treatment method based on electromagnetic field control according to claim 1, characterized in that, Also includes: If the temperature at any point within the electromagnetic field exceeds the first safety threshold, the electromagnetic field power will be automatically reduced or its operation will be suspended. If the temperature continues to rise and reaches a higher second safety threshold, the electromagnetic field will be immediately shut off, and an audible and visual alarm signal will be triggered. At the same time, the fault information will be uploaded to the control system.

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