Automatic carbon source adding device of sewage treatment system

Abstract

The invention relates to an automatic carbon source adding technology in a sewage treatment system, in particular to an automatic carbon source adding device for the sewage treatment system. The device comprises a flow meter, a chemical oxygen demand (COD) monitor, a total nitrogen (TN) monitor, a carbon source storage tank, a metering pump and a control unit, and can calculate and accurately control the adding amount of a carbon source according to the sewage flow, the chemical oxygen demand and the total nitrogen content. In addition, the device can also be provided with a nitrate nitrogen online detector, an ammonia nitrogen monitor and a biochemical oxygen demand (BOD) monitor, so that the carbon source feeding precision and the system stability are further improved. Analysis and decision making are performed by integrating data of a plurality of sensors, effective utilization of a carbon source is ensured, sewage treatment efficiency is improved, operation cost is reduced, a fault alarm function is achieved, and safe and reliable operation of the system is guaranteed.

Description

Technical Field

[0001] The present application relates to a carbon source automatic adding technology in a sewage treatment system, and in particular to a carbon source automatic adding device in a sewage treatment system. Background Art

[0002] Sewage treatment systems are an integral part of modern cities and industrial facilities, designed to effectively remove various pollutants from sewage and protect environmental quality. Traditional sewage treatment processes usually use biological denitrification, which achieves nitrogen conversion and removal through three stages: anaerobic, anoxic, and aerobic. Among them, the denitrification process occurs in the anoxic stage, which requires sufficient carbon sources to support the growth and metabolism of microorganisms, thereby reducing nitrates to nitrogen gas. However, due to the large fluctuations in influent water quality, it is difficult for traditional processes to accurately control the amount of carbon source added, resulting in unstable denitrification effects and affecting the overall sewage treatment performance.

[0003] In the existing sewage treatment system, in order to ensure the effective implementation of the denitrification process, the following measures are often taken: first, regularly manually add carbon sources, such as sodium acetate and other substances that are easily degraded by microorganisms; second, install a fixed flow metering pump to continuously add carbon sources according to the parameters set by experience; third, use simple instrumentation to monitor some water quality indicators and adjust the amount of carbon source added in combination with manual judgment. Although these methods can meet the denitrification needs to a certain extent, they have limitations when dealing with complex and changeable actual working conditions.

[0004] The main drawback of the existing technical means is the lack of accurate automatic control mechanism, which cannot dynamically adapt to changes in the influent water quality, and easily leads to excessive or insufficient carbon sources. Especially when the influent organic matter content is low and the total nitrogen content is high, the imbalance of carbon-nitrogen ratio will seriously affect the denitrification effect, and then affect the denitrification efficiency of the entire sewage treatment system. Therefore, it is particularly necessary to develop a device that can monitor and intelligently control the amount of carbon source added in real time. Summary of the invention

[0005] The purpose of this application is to overcome the above technical problems and provide an automatic carbon source adding device for a sewage treatment system.

[0006] The automatic carbon source adding device for sewage treatment system includes: Flow meters, used to measure the flow of sewage into the sewage treatment system; Chemical oxygen demand (COD) monitor, used to monitor chemical oxygen demand in sewage; Total nitrogen (TN) monitor, used to monitor the total nitrogen content in sewage; A carbon source storage tank, used for storing the carbon source; Metering pump for adding carbon source to sewage; and a control unit for calculating the required carbon source dosage according to data from the flow meter, the chemical oxygen demand monitor and the total nitrogen monitor, and controlling the metering pump to add the carbon source; The control unit receives signals from the flow meter, the chemical oxygen demand monitor and the total nitrogen monitor.

[0007] By adopting the above technical solution, the automatic carbon source addition device for the sewage treatment system of the present invention can calculate and accurately control the addition amount of the carbon source (sodium acetate) in real time according to the water inlet flow rate, chemical oxygen demand and total nitrogen content, ensuring the smooth progress of the denitrification reaction, thereby effectively improving the denitrification effect of the sewage treatment system. At the same time, the device can also timely adjust the carbon source addition strategy by online monitoring of changes in nitrate nitrogen and other water quality indicators to avoid waste of resources and environmental pollution caused by excessive addition.

[0008] Preferably, it also includes an online nitrate nitrogen detector arranged at the outlet of the anoxic tank, which is used to monitor the nitrate nitrogen concentration in real time and transmit the detection result to the control unit.

[0009] By adopting the above technical solution, the nitrate nitrogen concentration can be monitored in real time at the outlet of the anoxic tank, and the test results can be transmitted to the control unit. This helps to timely understand the progress of the denitrification reaction, so as to dynamically adjust the amount of carbon source added to ensure the efficient denitrification process and avoid resource waste and potential environmental pollution caused by excessive addition of carbon sources. At the same time, by real-time monitoring of nitrate nitrogen concentration, the problem of incomplete denitrification caused by excessive nitrate nitrogen concentration can be effectively prevented, and the overall performance and stability of the sewage treatment system can be improved.

[0010] Preferably, the control unit is also connected to a data storage module for storing historical data and performing data analysis, wherein the data storage module is communicatively connected to the control unit.

[0011] By adopting the above technical solution, the data storage module can record and store historical data, which is convenient for subsequent data analysis and system optimization. Specifically, the data storage module can save the historical data of the flow meter, chemical oxygen demand monitor and total nitrogen monitor, helping operators understand the operating status and trend changes of the system, so as to adjust the carbon source addition strategy in time to ensure the stability and reliability of the sewage treatment effect. At the same time, through the analysis of historical data, potential problems and improvement points can also be discovered, further improving the intelligence level and management efficiency of the system.

[0012] Preferably, the carbon source is sodium acetate, and the carbon source storage tank is connected to a metering pump through a pipeline.

[0013] By adopting the above technical solution and using sodium acetate as the carbon source, it is possible to ensure the provision of high-quality carbon sources that are quickly biodegraded during the denitrification process, effectively improve the denitrification efficiency, and avoid secondary pollution. At the same time, the pipeline connection design between the carbon source storage tank and the metering pump makes the addition of the carbon source more precise and controllable, ensuring the stable operation of the sewage treatment system.

[0014] Preferably, the control unit calculates the required sodium acetate dosage M1 based on the following method: M1=Q*[(C / N*TN0-COD0)*1.07], wherein Q is the inlet flow rate, C / N is the target carbon-nitrogen ratio, TN0 is the inlet total nitrogen content, COD0 is the inlet chemical oxygen demand, and the control unit performs the above calculation and sends the result to the metering pump.

[0015] By adopting the above technical scheme, the required amount of sodium acetate can be calculated in real time according to the inlet flow rate, chemical oxygen demand and total nitrogen content, and the working state of the metering pump can be accurately controlled by the control unit to ensure the reasonable supply of carbon source during the denitrification process, thereby effectively improving the denitrification efficiency of the sewage treatment system, avoiding the problem of incomplete denitrification due to insufficient carbon source, and preventing resource waste and secondary pollution caused by excessive addition.

[0016] Preferably, the online nitrate nitrogen detector transmits the detection result to the control unit for adjusting the carbon source dosage, and the online nitrate nitrogen detector is communicatively connected to the control unit.

[0017] By adopting the above technical solution, the nitrate nitrogen concentration can be monitored in real time at the outlet of the anoxic tank, and the detection results can be transmitted to the control unit. The control unit dynamically adjusts the amount of carbon source added according to the nitrate nitrogen concentration to ensure the efficient denitrification reaction. Specifically, when the nitrate nitrogen concentration is continuously and stably low, it means that the denitrification reaction is relatively thorough. At this time, the addition of carbon source can be appropriately reduced or stopped to avoid waste of resources and potential environmental pollution caused by excessive addition. At the same time, this real-time monitoring and adjustment mechanism improves the intelligence level of the system and enhances the reliability and stability of the system operation.

[0018] Preferably, it also includes an ammonia nitrogen monitor and a biochemical oxygen demand (BOD) monitor, which are used to monitor ammonia nitrogen and biochemical oxygen demand respectively, and the ammonia nitrogen monitor and the biochemical oxygen demand monitor are both communicatively connected with the control unit.

[0019] By adopting the above technical solutions, it is possible to more comprehensively monitor a variety of water quality parameters in the sewage treatment system, including ammonia nitrogen and biochemical oxygen demand. These monitoring data are combined with the monitoring data of chemical oxygen demand and total nitrogen, allowing the control unit to more accurately assess the current state of the sewage, thereby more accurately adjusting the amount of carbon source added. Specifically, the ammonia nitrogen monitor can timely reflect the treatment effect of the aerobic stage and ensure that ammonia nitrogen is effectively removed; while the biochemical oxygen demand monitor helps to determine the degree of decomposition of organic matter, further optimize the use efficiency of the carbon source, and improve the operational stability of the entire system.

[0020] Preferably, the control unit adjusts the amount of carbon source added according to changes in ammonia nitrogen, biochemical oxygen demand, total nitrogen, and chemical oxygen demand, wherein the control unit integrates data from multiple sensors for analysis and decision-making.

[0021] By adopting the above technical solutions, the control system can make real-time analysis and decisions based on the changes in ammonia nitrogen, biochemical oxygen demand, total nitrogen and chemical oxygen demand, dynamically adjust the amount of carbon source added, ensure the efficient denitrification process, and avoid excessive addition leading to waste of resources and potential secondary pollution. This intelligent control mechanism not only improves the overall performance of the sewage treatment system, but also enhances the stability and reliability of the system.

[0022] Preferably, the frequency of the metering pump is adjusted by the control unit in proportion to the calculated carbon source dosage, and the metering pump is electrically connected to the control unit.

[0023] By adopting the above technical solution, the frequency of the metering pump can be adjusted proportionally according to the amount of carbon source added calculated by the control unit, thereby achieving precise control of the amount of carbon source added. This dynamic adjustment method can ensure that the carbon-nitrogen ratio in the denitrification process is always in the optimal state, effectively improve the denitrification efficiency, and avoid poor treatment effects or waste of resources due to insufficient or excessive carbon sources. At the same time, the electrical connection between the metering pump and the control unit ensures the system response speed and stability, and improves the automation level and reliability of the entire sewage treatment system.

[0024] Preferably, it also includes an alarm unit, which issues an alarm when any sensor fails or the measured value exceeds a preset range, and the alarm unit is communicatively connected with the control unit.

[0025] By adopting the above technical solution, when any sensor fails or the measured value exceeds the preset range, the alarm unit will promptly issue an alarm to ensure that the operator can take prompt measures to avoid carbon source addition errors caused by sensor failure or abnormal data, thereby ensuring the stable operation of the sewage treatment system and efficient denitrification effect.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: 1. By real-time monitoring of the influent flow, chemical oxygen demand and total nitrogen content, and combining with the carbon-nitrogen ratio calculation model, the carbon source dosage is automatically adjusted to ensure that the carbon source supply in the denitrification process is sufficient and reasonable, avoiding incomplete denitrification due to insufficient carbon source or waste of resources and secondary pollution caused by excessive addition; 2. The nitrate nitrogen online detector installed at the outlet of the anoxic tank can timely feedback the changes in nitrate nitrogen concentration, further optimize the carbon source addition strategy, improve denitrification efficiency, and reduce unnecessary carbon source consumption; 3. The control unit integrates multiple water quality indicator monitoring functions, such as ammonia nitrogen, biochemical oxygen demand, etc. Through comprehensive analysis and decision-making of multiple parameters, more comprehensive water quality management can be achieved to ensure the stable operation of the sewage treatment system. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural principle block diagram of the automatic carbon source adding device for the sewage treatment system according to the embodiment of the present application. DETAILED DESCRIPTION

[0028] The following is combined with Figure 1 This application is described in further detail.

[0029] Embodiment 1: Reference Figure 1 The automatic carbon source adding device for the sewage treatment system provided in the embodiment of the present application includes a flow meter, a chemical oxygen demand (COD) monitor, a total nitrogen (TN) monitor, a carbon source storage tank, a metering pump and a control unit (not shown in the figure). The coordination relationship between the components is as follows: The flow meter is used to measure the flow of sewage entering the sewage treatment system. It is installed on the water inlet pipe and can collect accurate flow rate data in real time and transmit the signal to the control unit. Specifically, the flow meter can be an electromagnetic flow meter or an ultrasonic flow meter. The former is suitable for the flow measurement of conductive liquids, while the latter is suitable for the flow measurement of non-conductive liquids.

[0030] The chemical oxygen demand (COD) monitor is used to monitor the chemical oxygen demand in sewage. It is installed near the water inlet and can detect the organic matter content in sewage in real time and transmit the signal to the control unit. Specifically, the COD monitor can use a variety of methods such as photoelectric colorimetry or electrode method. For example, when using photoelectric colorimetry, the sample solution can be irradiated with light of a specific wavelength and the COD concentration can be determined by measuring the absorbance; or when using the electrode method, the COD concentration can be indirectly measured by the current intensity generated by the redox reaction.

[0031] The total nitrogen (TN) monitor is used to monitor the total nitrogen content in sewage. It is also installed near the water inlet and can detect the total nitrogen content in sewage in real time and transmit the signal to the control unit. Specifically, the TN monitor can use a variety of methods such as ultraviolet spectrophotometry or flow injection analysis. For example, when using ultraviolet spectrophotometry, the concentration of total nitrogen can be calculated by measuring the difference in absorbance at wavelengths of 220nm and 275nm; or when using flow injection analysis, the concentration of total nitrogen can be quantified by the color change after adding a color developer.

[0032] The carbon source storage tank is used to store the carbon source, usually sodium acetate or other substances that are easily degraded by microorganisms. The carbon source storage tank has good sealing and corrosion resistance, and is equipped with an agitator inside to keep the carbon source evenly distributed. The carbon source storage tank is connected to the metering pump through a pipeline to ensure smooth delivery of the carbon source. Specifically, the carbon source storage tank can be made of stainless steel, which is highly corrosion-resistant and easy to clean.

[0033] Metering pumps are used to add carbon sources to sewage, and can precisely adjust the dosage according to the instructions issued by the control unit. Metering pumps can be selected from types such as plunger pumps, diaphragm pumps or gear pumps. Each type of pump has its own unique application scenarios and advantages. For example, plunger pumps are suitable for the delivery of high-viscosity liquids, diaphragm pumps are suitable for liquids containing solid particles, and gear pumps are suitable for large-flow delivery of low-viscosity liquids. In addition, metering pumps can also be equipped with variable frequency speed regulators to dynamically adjust the dosage acceleration rate according to actual needs.

[0034] The control unit is the center of the entire system, responsible for receiving data from the flow meter, chemical oxygen demand monitor and total nitrogen monitor, and calculating the required carbon source dosage according to the preset algorithm. The core components of the control unit include microprocessor, memory, input / output interface, etc., with powerful data processing capabilities and stable operating performance. The control unit is also connected to a data storage module for storing historical data and performing data analysis to help optimize the carbon source addition strategy. Specifically, the control unit can use an industrial-grade PLC or embedded controller with high computing speed and reliability.

[0035] Specific implementation process: 1. Data collection: The flow meter, chemical oxygen demand monitor and total nitrogen monitor collect sewage flow, COD and TN data respectively, and transmit these data to the control unit in real time.

[0036] 2. Data processing: After receiving the data, the control unit calculates the required amount of sodium acetate to be added according to the following formula: \[ M_1 = Q \times ((C / N \times T{N}_0 - C{O}D_0) \times 1.07) \] Among them, \( Q \) is the influent flow rate (m³ / h), \( C / N \) is the target carbon-nitrogen ratio (e.g., take 5), \( T{N}_0 \) is the influent total nitrogen content (mg / L), \( C{O}D_0 \) is the influent chemical oxygen demand (mg / L), and 1.07 is the chemical oxygen demand equivalent of sodium acetate.

[0037] 3. Control execution: The control unit sends instructions to the metering pump based on the calculated \( M_1 \) to adjust the working frequency of the metering pump so that the dosage of the carbon source reaches the predetermined value.

[0038] 4. Real-time monitoring: The control unit continuously receives new data from various sensors and updates the carbon source dosage in real time to ensure that the system is always in the optimal state.

[0039] This embodiment achieves precise control of the amount of carbon source added by integrating multiple sensors and advanced control units. Compared with the traditional manual addition or fixed flow addition method, the present invention can dynamically adapt to changes in influent water quality, avoid the problem of excessive or insufficient carbon source, significantly improve the denitrification effect, and enhance the overall performance of the sewage treatment system.

[0040] Embodiment 2: The difference between this embodiment and the above embodiment is that an online nitrate nitrogen detector is added at the outlet of the anoxic tank, which further enhances the adaptive ability of the system. Specifically, the online nitrate nitrogen detector is installed at the outlet of the anoxic tank, which can monitor the nitrate nitrogen concentration in real time and transmit the detection results to the control unit. Specifically, the online nitrate nitrogen detector can adopt a variety of methods such as ion selective electrode method or fluorescence method. For example, when using the ion selective electrode method, the concentration of nitrate nitrogen can be determined by measuring the nitrate ion concentration in the electrolyte solution; or when using the fluorescence method, the concentration of nitrate nitrogen can be indirectly determined by measuring the change in fluorescence intensity.

[0041] Specific implementation process: 1. Data collection: In addition to the flow meter, chemical oxygen demand monitor and total nitrogen monitor, the newly added nitrate nitrogen online detector is also involved in data collection to monitor the nitrate nitrogen concentration at the outlet of the anoxic tank in real time.

[0042] 2. Data processing: After the control unit receives the data from all sensors, it first calculates the initial sodium acetate dosage \( M_1 \) according to the above formula. Then, according to the results of the nitrate nitrogen online detector, the carbon source dosage is dynamically adjusted. If the nitrate nitrogen concentration is continuously and stably low, it means that the denitrification reaction has been relatively thorough, and the carbon source dosage can be appropriately reduced or even stopped.

[0043] 3. Control execution: The control unit considers multiple factors and sends the final carbon source dosage instruction to the metering pump to ensure that the system runs more efficiently and economically.

[0044] 4. Real-time monitoring: The control unit continuously monitors changes in nitrate nitrogen concentration and other water quality indicators, and makes timely adjustments to ensure that the system is always in optimal working condition.

[0045] This embodiment further refines the control strategy of carbon source addition by introducing an online nitrate nitrogen detector, so that the system can respond more accurately to the needs of the denitrification process. This improvement not only reduces unnecessary carbon source waste, but also extends the service life of the equipment, reduces operating costs, and improves the effect of sewage treatment.

[0046] Embodiment 3: This embodiment adds an ammonia nitrogen monitor and a biochemical oxygen demand (BOD) monitor on the basis of the above, further enriching the monitoring dimension of the system. Specifically, the ammonia nitrogen monitor and the BOD monitor are both connected to the control unit for communication, and monitor the concentration changes of ammonia nitrogen and BOD in real time. Specifically, the ammonia nitrogen monitor can adopt a variety of methods such as gas phase molecular absorption spectroscopy or electrochemical method. For example, when using gas phase molecular absorption spectroscopy, the concentration of ammonia nitrogen in water can be determined by measuring the concentration of ammonia nitrogen in the gas; or when using electrochemical method, the concentration of ammonia nitrogen can be indirectly determined by measuring the current change on the electrode. The BOD monitor can adopt a variety of methods such as dissolved oxygen method or pressure method. For example, when using dissolved oxygen method, the concentration of BOD can be determined by measuring the consumption rate of dissolved oxygen during the culture process; or when using pressure method, the concentration of BOD can be indirectly determined by measuring the pressure change in a closed container.

[0047] Specific implementation process: 1. Data collection: Flow meter, chemical oxygen demand monitor, total nitrogen monitor, nitrate nitrogen online detector, ammonia nitrogen monitor and BOD monitor jointly participate in data collection, each monitoring the corresponding water quality indicators.

[0048] 2. Data processing: After the control unit receives the data from all sensors, it first calculates the initial sodium acetate dosage \( M_1 \) according to the above formula. Then, combined with the monitoring results of ammonia nitrogen and BOD, the carbon source dosage is further adjusted. For example, if the concentrations of ammonia nitrogen and BOD are high, it means that the organic load is large, and the carbon source dosage may need to be increased to support the growth and metabolism of microorganisms.

[0049] 3. Control execution: The control unit comprehensively considers multiple water quality indicators and sends the final carbon source dosage instruction to the metering pump to ensure that the system operates more efficiently and economically.

[0050] 4. Real-time monitoring: The control unit continuously monitors changes in various water quality indicators and makes timely adjustments to ensure that the system is always in the best working condition.

[0051] This embodiment introduces more water quality monitoring instruments to comprehensively cover various key indicators involved in the denitrification process, so that the system can more comprehensively evaluate and regulate the amount of carbon source added. This improvement not only improves the intelligence level of the system, but also further improves the effect of sewage treatment and ensures that the effluent quality reaches a higher standard.

[0052] Embodiment 4: This embodiment adds an alarm unit on the basis of the above, and when any sensor fails or the measured value exceeds the preset range, an alarm is issued to remind the operator to check and maintain the equipment in time. Specifically, the alarm unit is connected to the control unit for communication, and can monitor the status and measured value of the sensor in real time. Specifically, the alarm unit can use a sound alarm or a light alarm, or remotely notify the operator through the network.

[0053] Specific implementation process: 1. Data collection: Flow meter, chemical oxygen demand monitor, total nitrogen monitor, nitrate nitrogen online detector, ammonia nitrogen monitor and BOD monitor jointly participate in data collection, each monitoring the corresponding water quality indicators.

[0054] 2. Data processing: After receiving the data from all sensors, the control unit first calculates the initial sodium acetate dosage \( M_1 \) according to the above formula. Then, combined with the monitoring results of various water quality indicators, the carbon source dosage is further adjusted.

[0055] 3. Abnormal detection: The control unit monitors the status and measurement value of each sensor in real time. Once a sensor failure or measurement value exceeds the preset range is found, the alarm unit will be triggered to issue an alarm. For example, if the measurement value of a sensor suddenly deviates greatly from the normal range, it may be that the sensor itself is faulty or the external conditions have changed suddenly.

[0056] 4. Control execution: The control unit considers multiple factors and sends the final carbon source dosage instruction to the metering pump to ensure that the system runs more efficiently and economically.

[0057] 5. Real-time monitoring: The control unit continuously monitors changes in various water quality indicators and makes timely adjustments to ensure that the system is always in the best working condition.

[0058] Beneficial effects: This embodiment greatly improves the reliability and safety of the system by introducing an alarm unit. Once an abnormal situation occurs, the operator can quickly take measures to prevent sewage treatment failure caused by equipment failure, thereby ensuring the stable operation of the system. This improvement not only improves the intelligence level of the system, but also provides strong support for daily operation and maintenance.

[0059] Embodiment 5: This embodiment further optimizes the design of the metering pump on the basis of the above, so that it can show better performance under different working conditions. Specifically, the metering pump is equipped with a double-headed plunger pump, which can provide a larger flow rate under high load conditions, while also retaining the accuracy and stability of a single-headed plunger pump. Specifically, the double-headed plunger pump can be made of stainless steel, which has strong corrosion resistance and a long service life.

[0060] Specific implementation process: 1. Data collection: Flow meter, chemical oxygen demand monitor, total nitrogen monitor, nitrate nitrogen online detector, ammonia nitrogen monitor and BOD monitor jointly participate in data collection, each monitoring the corresponding water quality indicators.

[0061] 2. Data processing: After receiving the data from all sensors, the control unit first calculates the initial sodium acetate dosage \( M_1 \) according to the above formula. Then, combined with the monitoring results of various water quality indicators, the carbon source dosage is further adjusted.

[0062] 3. Control execution: The control unit sends instructions to the metering pump based on the calculated carbon source dosage. The metering pump switches to different working modes according to the instructions. For example, when the flow demand is low, a single-head plunger pump is used to ensure high precision; when the flow demand is high, a double-head plunger pump is used to ensure a large flow supply.

[0063] 4. Real-time monitoring: The control unit continuously monitors changes in various water quality indicators and makes timely adjustments to ensure that the system is always in the best working condition.

[0064] Beneficial effects: This embodiment optimizes the design of the metering pump so that the system can show excellent performance in different working conditions. This design not only improves the flexibility and adaptability of the system, but also extends the service life of the equipment, reduces maintenance costs, and further improves the effect of sewage treatment.

[0065] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. Automatic carbon source adding device for sewage treatment system, characterized in that: include: Flow meters, used to measure the flow of sewage into the sewage treatment system; Chemical oxygen demand (COD) monitor, used to monitor chemical oxygen demand in sewage; Total nitrogen (TN) monitor, used to monitor the total nitrogen content in sewage; A carbon source storage tank, used for storing the carbon source; Metering pump for adding carbon source to sewage; and a control unit for calculating the required carbon source dosage according to data from the flow meter, the chemical oxygen demand monitor and the total nitrogen monitor, and controlling the metering pump to add the carbon source; The control unit receives signals from the flow meter, the chemical oxygen demand monitor and the total nitrogen monitor.

2. The automatic carbon source adding device for sewage treatment system according to claim 1, characterized in that: It also includes an online nitrate nitrogen detector arranged at the outlet of the anoxic pool, which is used to monitor the nitrate nitrogen concentration in real time and transmit the detection result to the control unit.

3. The automatic carbon source adding device for sewage treatment system according to claim 1, characterized in that: The control unit is also connected to a data storage module for storing historical data and performing data analysis, wherein the data storage module is in communication connection with the control unit.

4. The automatic carbon source adding device for sewage treatment system according to claim 1, characterized in that: The carbon source is sodium acetate, and the carbon source storage tank is connected with a metering pump through a pipeline.

5. The automatic carbon source adding device for sewage treatment system according to claim 1, characterized in that: The control unit calculates the required sodium acetate dosage M1 based on the following method: M1=Q*[(C / N*TN0-COD0)*1.07], where Q is the inlet flow rate, C / N is the target carbon-nitrogen ratio, TN0 is the inlet total nitrogen content, and COD0 is the inlet chemical oxygen demand. The control unit performs the above calculation and sends the result to the metering pump.

6. The automatic carbon source adding device for sewage treatment system according to claim 2, characterized in that: The nitrate nitrogen online detector transmits the detection result to the control unit for adjusting the carbon source dosage, and the nitrate nitrogen online detector is communicatively connected with the control unit.

7. The automatic carbon source adding device for sewage treatment system according to claim 1, characterized in that: It also includes an ammonia nitrogen monitor and a biochemical oxygen demand (BOD) monitor, which are used to monitor ammonia nitrogen and biochemical oxygen demand respectively. The ammonia nitrogen monitor and the biochemical oxygen demand monitor are both connected to the control unit for communication.

8. The automatic carbon source adding device for sewage treatment system according to claim 7, characterized in that: The control unit adjusts the amount of carbon source added according to changes in ammonia nitrogen, biochemical oxygen demand, total nitrogen, and chemical oxygen demand, wherein the control unit integrates data from multiple sensors to perform analysis and decision-making.

9. The automatic carbon source adding device for sewage treatment system according to claim 1, characterized in that: The frequency of the metering pump is proportionally adjusted by the control unit according to the calculated carbon source dosage, and the metering pump is electrically connected to the control unit.

10. The automatic carbon source adding device for sewage treatment system according to claim 1, characterized in that: It also includes an alarm unit, which issues an alarm when any sensor fails or the measured value exceeds a preset range. The alarm unit is communicatively connected with the control unit.

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