A precise control device and system for a sewage treatment plant

Abstract

The utility model provides a kind of sewage treatment plant precision control device and system.The utility model's sewage treatment plant precision control device, by accurately controlling reflux water flow, can effectively improve the nitrogen removal and organic matter removal efficiency in sewage treatment process.The buffer pool in inner reflux pipeline can dynamically adjust reflux water flow, ensure that the aerobic reaction in the second generator can be adjusted in real time according to water quality change, optimize treatment effect.The device can solve the problem of insufficient reflux control precision in traditional sewage treatment device, avoid energy waste and unstable water quality, improve the efficiency and water quality stability of the whole sewage treatment process.At the same time, by configuring sedimentation tank for solid-liquid separation, further ensure that water quality meets discharge standard, so as to improve the overall operation performance and reliability of sewage treatment plant.

Description

Technical Field

[0001] This utility model relates to the technical field of wastewater treatment, specifically to a precision control device and system for wastewater treatment plants. Background Technology

[0002] In modern wastewater treatment, denitrification and organic matter removal are two core tasks. Traditional wastewater treatment technologies rely heavily on manual operation for the control of denitrification and aerobic reactions, resulting in low operational precision, control lag, and an inability to adjust the treatment process in real time according to fluctuations in water quality. Especially in recirculation control, precise adjustment of the recirculation flow rate is crucial to the performance of wastewater treatment plants and the stability of water quality.

[0003] In related technologies, there is a technical problem of insufficient accuracy in reflux control. Summary of the Invention

[0004] The purpose of this utility model is to overcome the above-mentioned technical deficiencies and provide a precise control device and system for sewage treatment plants to solve the technical problem of insufficient backflow control accuracy in related technologies.

[0005] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution: In a first aspect, this utility model provides a precision control device for a wastewater treatment plant, comprising: The first generator, which is used to perform the denitrification reaction, has an inlet, an internal reflux inlet, and an outlet; wherein, the inlet of the first generator is used to receive the wastewater to be treated; The second generator, which is used to perform the aerobic reaction, has its input port connected to the output port of the first generator; An internal return pipeline is provided, with one end connected to the output port of the second generator and the other end connected to the internal return port of the first generator; wherein, a buffer tank is configured in the internal return pipeline to regulate the flow rate of the return water. The sedimentation tank has its inlet connected to the outlet of the second generator for solid-liquid separation.

[0006] Furthermore, the internal return pipeline also includes: An internal reflux pump is installed between one end of the internal reflux pipeline and the inlet of the buffer tank for pumping reflux water into the buffer tank; wherein an inlet electric valve is provided at the inlet of the buffer tank and an outlet electric valve is provided at the outlet of the buffer tank.

[0007] Furthermore, the internal return pipeline also includes: A proportional control valve is configured between the outlet of the buffer tank and the internal reflux port of the first generator; A flow meter is configured between the proportional control valve and the outlet of the buffer tank.

[0008] Furthermore, the internal reflux port of the first generator is equipped with a first check valve.

[0009] Furthermore, a liquid level sensor is configured inside the first generator to detect the liquid level height of the first generator; and a nitrate nitrogen sensor is configured inside the second generator and at the output port to detect the nitrate nitrogen concentration in the second generator.

[0010] Furthermore, it also includes: The well has its inlet connected to the output port of the second generator and its outlet connected to the input port of the sedimentation tank.

[0011] Furthermore, the output port of the second generator is provided with a branched conduit, the branched conduit comprising: The main road connects to the entrance of the inspection well; A branch line, which connects to one end of the internal return pipe; A shut-off valve, which is configured in the main circuit, is used to control the on / off state of the main circuit; The second check valve, which is configured at the inlet end of the detection well in the main pipeline, allows water to flow only from the second generator to the detection well.

[0012] Furthermore, a total nitrogen sensor is configured in the detection well to detect the total nitrogen concentration before the sedimentation tank is filled with water.

[0013] Furthermore, it also includes: The control device has its signal input terminals electrically connected to the flow meter, liquid level sensor, nitrate nitrogen sensor and total nitrogen sensor, respectively, and its signal output terminals electrically connected to the signal input terminals of the internal reflux pump, inlet electric valve, outlet electric valve and proportional regulating valve, respectively.

[0014] Secondly, this utility model provides a sewage treatment system, including: the aforementioned precision control device for a sewage treatment plant.

[0015] Beneficial effects: This utility model discloses a precision control device for wastewater treatment plants. By precisely controlling the return water flow rate, it effectively improves the denitrification and organic matter removal efficiency during wastewater treatment. The buffer tank in the internal return pipeline can dynamically adjust the return water flow rate, ensuring that the aerobic reaction in the second generator can be adjusted in real time according to water quality changes, thus optimizing the treatment effect. This device solves the problem of insufficient return control precision in traditional wastewater treatment devices, avoiding energy waste and water quality instability, and improving the efficiency and water quality stability of the entire wastewater treatment process. Simultaneously, by configuring a sedimentation tank for solid-liquid separation, it further ensures that the water quality meets discharge standards, thereby improving the overall operational performance and reliability of the wastewater treatment plant. Attached Figure Description

[0016] Figure 1 This is an architectural diagram of a precision control device for a wastewater treatment plant provided in an embodiment of this utility model; Figure 2 This is an architectural diagram of a precision control device for a wastewater treatment plant provided in an embodiment of this utility model; Figure 3 This is an architectural diagram of a control device provided in an embodiment of the present utility model; In the attached image: First Generator-100; First check valve -110; Liquid level sensor-120; Second generator-200; Nitrate Nitrogen Sensor-210; Internal return piping 300; Buffer pool -310; Internal reflux pump-320; Proportional regulating valve -330; Flow meter -340; Inlet electric valve-3101; Export electric valve-3102; Sedimentation tank - 400; Inspection well -500; Total nitrogen sensor-510; Control device 600. Detailed Implementation

[0017] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0018] The return flow rate directly affects the operating efficiency and denitrification effect of the aerobic reactor. In existing technologies, internal return pipelines are typically used to connect the aerobic reactor and the denitrification reactor, ensuring that nitrogen compounds in the water can be effectively removed at different reaction stages. However, the adjustment precision of the return flow rate is often low, mainly due to problems such as response lag and insensitive control in the flow regulation system. Furthermore, traditional return systems struggle to accurately respond to changes in water quality and quantity, leading to low denitrification efficiency, resource waste, and increased energy consumption in wastewater treatment. In many traditional wastewater treatment systems, the adjustment of the return flow rate relies on a fixed setting, failing to respond in real-time to fluctuations in water quality and quantity during wastewater treatment, resulting in unstable denitrification and organic matter removal efficiencies.

[0019] like Figure 1 As shown, this embodiment provides a precision control device for a wastewater treatment plant, including: The first generator 100, which is used to perform a denitrification reaction, has an inlet, an internal reflux port, and an outlet; wherein the inlet of the first generator is used to receive wastewater to be treated.

[0020] In this embodiment, the first generator 100 may be an anoxic generator, whose main function is to provide a suitable environment to promote the denitrification reaction, thereby removing nitrate nitrogen and other nitrogen compounds from the water.

[0021] Specifically, in the wastewater treatment process, an anaerobic environment is created by controlling the oxygen concentration within the first generator 100. The first generator 100 is primarily used to perform denitrification reactions, particularly the denitrification process. In this anaerobic environment, microorganisms convert nitrate nitrogen into nitrogen gas, thus removing nitrogen. This process plays a crucial role in removing nitrogen pollutants from wastewater, effectively reducing the nitrogen content in the effluent and meeting environmental discharge standards.

[0022] In this embodiment, the inlet is used to receive wastewater to be treated (e.g., wastewater from an anaerobic reactor). The wastewater enters the first generator 100 through the inlet, where dissolved oxygen in the wastewater is rapidly consumed, creating an anoxic environment suitable for the growth of denitrifying microorganisms. The internal return port is used to receive water flowing back from the aerobic reactor. This return water contains nitrate nitrogen from the aerobic reactor and flows back into the anoxic generator, helping denitrifying microorganisms to utilize the nitrate nitrogen for further removal of nitrogen compounds from the water.

[0023] In this embodiment, the first generator 100 can be an anoxic reaction tank. It is understood that the anoxic reaction tank can be equipped with a dissolved oxygen monitoring device to ensure that the oxygen concentration in the tank is maintained within the anoxic range, creating a suitable denitrification environment.

[0024] In this embodiment, the first generator 100 may also be a multi-stage denitrification reaction tank.

[0025] In this embodiment, the first generator 100 may also be a reaction tower.

[0026] In this embodiment, the first generator 100 may also be a membrane bioreactor (MBR).

[0027] The second generator 200, which is used to perform an aerobic reaction, has its input port connected to the output port of the first generator.

[0028] In this embodiment, the second generator 200 can be an aerobic reactor. The core function of the second generator 200 is to degrade organic matter in the water into harmless carbon dioxide and water through the action of aerobic microorganisms, thereby reducing organic pollutants in the water. In an aerobic environment, microorganisms (such as nitrifying bacteria) in the aerobic reactor oxidize ammonia nitrogen into nitrate nitrogen. This process is called nitrification, which is an important step in removing nitrogen pollution from wastewater.

[0029] Specifically, the input port is connected to the output port of the first generator 100. The wastewater passing through the first generator 100 has already undergone partial denitrification and organic matter degradation. After entering the aerobic reactor, it undergoes further nitrification and complete degradation of organic matter. The aerobic reactor can be equipped with aeration equipment to provide sufficient oxygen to the reactor, maintain good oxygen transfer efficiency, and ensure that microorganisms can carry out metabolic activities efficiently in an aerobic environment.

[0030] In this embodiment, the second generator 200 may be an aerobic reaction tank.

[0031] In this embodiment, the second generator 200 may be a biological contact oxidation tank. This biological contact oxidation tank may further include a biofilm and an aeration system. Specifically, the biological contact oxidation tank is filled with packing material, on which microorganisms attach to form a biofilm. As water flows through these packing materials, the microorganisms utilize oxygen to degrade organic matter and nitrogen compounds. The aeration system provides sufficient oxygen to support the activity of the microorganisms.

[0032] In this embodiment, the second generator 200 may be a membrane bioreactor. This membrane bioreactor may further include a membrane filtration system and an aeration system. The membrane filtration system can filter out suspended solids and impurities in the water while maintaining efficient biodegradation capabilities.

[0033] In this embodiment, the second generator 200 can be an oxidation ditch. That is, water flows in a closed ditch while being aerated to provide sufficient oxygen to promote the metabolic reactions of microorganisms.

[0034] In this embodiment, the second generator 200 may be a biological filter.

[0035] An internal return pipe 300 is connected at one end to the output port of the second generator and at the other end to the internal return port of the first generator; wherein, a buffer tank 310 is configured in the internal return pipe to regulate the flow rate of the return water.

[0036] In this embodiment, one end of the internal return pipe 300 is connected to the output port of the second generator 200 (aerobic reactor) to recover the water flow treated by the aerobic reactor. This water flow may contain nitrate nitrogen and other dissolved oxygen-rich components, which can serve as a return water source for the first generator 100 (anoxic reaction tank). The other end of the internal return pipe 300 is connected to the internal return port of the first generator 100, introducing the return water into the first generator 100. This return water helps promote the denitrification process, providing a nitrate nitrogen source for denitrifying microorganisms, thereby achieving nitrogen removal. A buffer tank 310 configured in the internal return pipe 300 is used to regulate the flow rate of the return water. When the return water flow rate is too high or too low, the buffer tank 310 can store or release the water flow to ensure that the flow rate remains within a suitable range. Especially when the first generator 100 is close to full load, the buffer tank can first store the excess return water and then release the water flow when the water level in the first generator 100 decreases, preventing pipe overload or unstable water flow.

[0037] In this embodiment, the internal return pipe 300 can be made of stainless steel or PVC pipe.

[0038] In this embodiment, the buffer pool 310 can be a rectangular buffer pool.

[0039] In this embodiment, the buffer pool 310 may be a circular buffer pool.

[0040] Understandably, when the first generator 100 is full, the internal return water flowing from the second generator 200 to the first generator 100 can be stored in the buffer tank 310, thus avoiding instantaneous overload or unstable flow of the internal return water. The buffer tank 310 serves as a temporary storage and regulation tank, smoothly adjusting the return water flow to ensure that the water flow in the internal return pipeline 300 is neither too much nor too little, preventing interference with the wastewater treatment process. Simultaneously, the design of the buffer tank 310 effectively improves the precision of return control, allowing the aerobic reaction in the second generator 200 to be adjusted in real time according to actual needs, optimizing the efficiency of denitrification and organic matter removal, and further enhancing the stability and treatment effect of the wastewater treatment process.

[0041] The sedimentation tank 400 has its inlet connected to the output of the second generator for solid-liquid separation.

[0042] In this embodiment, the core function of the sedimentation tank 400 is to separate solid matter (such as sludge and sediment) from liquid (treated water). Inside the sedimentation tank 400, the water flow rate slows down, and suspended particles in the wastewater gradually settle to the bottom due to gravity, forming a sludge layer.

[0043] In some embodiments, the buffer pool 310 may be provided with a flow guide plate, which is an inclined porous structure and is distributed at intervals along the water flow direction to reduce water flow turbulence and distribute the flow rate evenly.

[0044] In some embodiments, a redundant control valve group is provided between the internal return port and the internal return pipeline of the first generator 100. The redundant control valve group includes an electric valve and a pneumatic valve installed in parallel, and the inlet ends of the two valves are connected by a T-fitting pipe.

[0045] In this embodiment, the bottom of the sedimentation tank 400 may have a certain inclination, either towards the center or the drain outlet. This ensures that the sludge is concentrated at the bottom of the tank and removed through the drain outlet. The bottom of the tank may also be designed with a sludge discharge outlet for periodically removing deposited sludge, preventing the sludge layer from becoming too thick and affecting the settling effect.

[0046] The precision control device for the wastewater treatment plant in this embodiment effectively improves the denitrification and organic matter removal efficiency during wastewater treatment by precisely controlling the return water flow. The buffer tank 310 in the internal return pipeline 300 can dynamically adjust the return water flow, ensuring that the aerobic reaction in the second generator 200 can be adjusted in real time according to water quality changes, optimizing the treatment effect. This device solves the problem of insufficient return control precision in traditional wastewater treatment devices, avoiding energy waste and water quality instability, and improving the efficiency and water quality stability of the entire wastewater treatment process. Simultaneously, by configuring a sedimentation tank for solid-liquid separation, it further ensures that the water quality meets discharge standards, thereby improving the overall operational performance and reliability of the wastewater treatment plant.

[0047] like Figure 2 As shown, in some embodiments, the internal return line 300 further includes: An internal reflux pump 320 is disposed between one end of the internal reflux pipeline 300 and the inlet of the buffer tank 310 for pumping reflux water into the buffer tank 310; wherein an inlet electric valve 3101 is provided at the inlet of the buffer tank 310 and an outlet electric valve 3102 is provided at the outlet of the buffer tank 310.

[0048] In this embodiment, the internal reflux pump 320 is located at one end of the internal reflux pipeline 300, before the inlet of the buffer tank 310. Its main function is to send the reflux water from the aerobic reactor into the buffer tank 310. The internal reflux pump 320 provides sufficient power to ensure that the flow rate and velocity of the reflux water meet the requirements of the treatment system. The main function of the buffer tank 310 is to store and regulate the reflux water flow rate, preventing instantaneous fluctuations in the reflux water from affecting the system. The buffer tank 310 can stabilize the water flow, ensuring a stable flow rate in the internal reflux pipeline 300 and avoiding the impact of excessive or insufficient flow rate on the water quality and microbial activity in the reactor.

[0049] In this embodiment, an inlet electric valve 3101 is installed at the inlet of the buffer tank 310 to regulate the flow rate of return water into the buffer tank 310. The inlet electric valve 3101 can automatically adjust its opening and closing degree (for example, the inlet electric valve 3101 can be electrically connected to a control device and receive control signals from the control device) to control the flow rate and ensure that too much or too little water enters the buffer tank 310. An outlet electric valve 3102 is installed at the outlet of the buffer tank 310 to control the flow of stored water from the buffer tank 310 into the internal return pipe 300. By adjusting the outlet electric valve, the water release from the buffer tank 310 can be controlled to ensure that the flow rate into the first generator 100 is always within a preset range.

[0050] In this embodiment, the internal reflux pump can be a self-priming centrifugal pump.

[0051] In this embodiment, the internal reflux pump can be a submersible sewage pump.

[0052] In this embodiment, the internal reflux pump can be a screw pump.

[0053] In this embodiment, the internal reflux pump can be a diaphragm pump.

[0054] In this embodiment, the internal reflux pump can be a vacuum jet pump.

[0055] In this embodiment, the internal reflux pump can be a variable frequency pump with a frequency converter module. Specifically, the frequency converter module can receive signals from the control device and adjust the motor speed and the pump output flow rate.

[0056] In this embodiment, the internal reflux pump can be a variable frequency self-priming centrifugal pump.

[0057] This embodiment, by configuring an internal return pump 320 in the internal return pipeline 300, can effectively deliver the return water into the buffer tank 310, ensuring a stable water flow and reasonable flow regulation. The buffer tank 310, equipped with an inlet electric valve 3101 and an outlet electric valve 3102, can precisely control the flow rate and direction of the return water, thereby preventing excessive or insufficient return flow from affecting the treatment process. This design enables flexible adjustment of the water flow, ensuring that the water flow in the reactor is always within the optimal range, further improving the operating efficiency and stability of the wastewater treatment system. Simultaneously, the water storage function of the buffer tank 310 can temporarily store water when the return water volume is too large, preventing system overload, ensuring water flow balance between reactors, and optimizing the entire wastewater treatment process.

[0058] In some embodiments, the internal return line 300 further includes: A proportional control valve 330 is configured between the outlet of the buffer tank 310 and the internal return port of the first generator 100.

[0059] A flow meter 340 is configured between the proportional control valve 330 and the outlet of the buffer tank 310.

[0060] In this embodiment, the proportional control valve 330 can be a valve that can automatically adjust its opening degree according to the input signal (issued by the control device).

[0061] In this embodiment, the proportional control valve 330 can be an electric ball valve. The electric ball valve controls the valve opening by adjusting the rotation angle of the ball through an electric actuator. The control device can control the electric actuator via an electrical signal, causing the ball to adjust proportionally and precisely control the flow rate.

[0062] In this embodiment, the proportional control valve 330 can be an electric butterfly valve.

[0063] In this embodiment, the proportional control valve 330 can be an electrically controlled gate valve.

[0064] In this embodiment, the flow meter 340 can be used to monitor the flow rate of the return water in the internal return pipe 300 in real time and send the data to the control device.

[0065] In this embodiment, the flow meter 340 may be an electromagnetic flow meter.

[0066] In this embodiment, the flow meter 340 may be an ultrasonic flow meter.

[0067] In this embodiment, the flow meter 340 may be a vortex flow meter.

[0068] In this embodiment, the flow meter 340 may be a mass flow meter.

[0069] In one specific implementation, the flow meter 340 can be located adjacent to the outlet of the buffer tank 310, upstream of the proportional control valve 330, and can be connected to the outlet pipe of the buffer tank 310 via a flange (or clamp). The valve body of the proportional control valve 330 can be connected by flanges at both ends, keeping it horizontal with the pipeline axis.

[0070] This embodiment achieves precise regulation and real-time monitoring of the return water flow rate by configuring a proportional regulating valve 330 and a flow meter 340 in the internal return pipeline 300. The proportional regulating valve 330 can adjust the return water flow rate to ensure that the flow rate is always maintained within a preset range, thereby optimizing the reaction conditions in the first generator 100. The flow meter 340 can monitor the flow rate in real time and feed the data back to the control device to ensure that the overall system can accurately respond to changes in water flow rate and avoid excessive or insufficient return water affecting the treatment effect. Through this design, the device can flexibly cope with flow fluctuations, provide an efficient and stable sewage treatment process, and improve the accuracy and automation level of flow control.

[0071] In some embodiments, the internal reflux port of the first generator is configured with a first check valve 110.

[0072] This embodiment effectively prevents backflow of return water when the pump stops or the system pressure reverses by configuring a first check valve 110 at the internal return port of the first generator 100. The first check valve 110 ensures that the water flows only in a predetermined direction, that is, the return water can only flow from the aerobic reaction tank to the anoxic reaction tank, and cannot flow back to the second generator 200. This design avoids the backflow of pollutants, ensures unidirectional water flow in the system, reduces water pollution and reactor load fluctuations, and ensures the stability and efficiency of the wastewater treatment process. At the same time, the configuration of the check valve also extends the service life of the equipment, reduces maintenance costs, and improves the reliability of the system.

[0073] In some embodiments, a liquid level sensor 120 is disposed inside the first generator 100 for detecting the liquid level height of the first generator 100; and a nitrate nitrogen sensor 210 is disposed inside the second generator 200 and at the output port for detecting the nitrate nitrogen concentration in the second generator 200.

[0074] In this embodiment, the liquid level sensor 120 can be a float liquid level sensor.

[0075] In this embodiment, the liquid level sensor 120 may be a hydrostatic liquid level sensor.

[0076] In this embodiment, the liquid level sensor 120 may be a capacitive liquid level sensor.

[0077] In this embodiment, the nitrate nitrogen sensor 210 may be an ion-selective electrode (ISE) nitrate nitrogen sensor.

[0078] In this embodiment, the nitrate nitrogen sensor 210 can be an electrochemical sensor.

[0079] In one specific implementation, the level sensor 120 is vertically installed in the middle of the side wall of the first generator 100, at a height of 1 / 2 to 2 / 3 of the total height of the tank. It can be fixed to the inner wall of the tank by welding or bolting with a stainless steel bracket, and the sensor probe can extend 10-15 cm below the liquid surface. The signal line of the level sensor 120 can be led out from the top of the tank through a waterproof conduit, with the conduit sealed to the tank wall with epoxy resin. The cable is connected to the analog input interface of the intelligent control cabinet (control module). The nitrate nitrogen sensor 210 is horizontally installed on the inner wall of the output port of the second generator 200, 30-50 cm upstream of the outlet flange (to avoid interference from water turbulence). It can be connected to the reactor wall through a flange, and the sensor probe can extend into the central area of ​​the water flow.

[0080] This embodiment effectively enhances the automated control and precise regulation capabilities of the wastewater treatment system by configuring a level sensor 120 inside the first generator 100 and a nitrate nitrogen sensor 210 at the output port of the second generator 200. The level sensor 120 monitors the liquid level in the first generator 100 in real time, ensuring the water level in the reaction tank remains within the optimal range, thus preventing overflow or low water levels that could reduce treatment efficiency. The nitrate nitrogen sensor 210 detects the nitrate nitrogen concentration in the second generator 200 in real time, providing the system with accurate water quality data to help the control system optimize the return flow rate and reaction conditions, ensuring maximum denitrification. Through the configuration of these two sensors, the system can achieve precise level and water quality control, improving the stability and treatment efficiency of the wastewater treatment process, while reducing the need for manual intervention, enhancing automation levels, and improving overall operational reliability.

[0081] In some embodiments, it also includes: The detection well 500 has its inlet connected to the output port of the second generator 200, and its outlet connected to the input port of the sedimentation tank 400.

[0082] In this embodiment, after the water flows out from the aerobic reactor, it first passes through the detection well 500. At this time, the detection well 500 can sample and analyze the water flow, monitoring key parameters in the water quality (such as total nitrogen, nitrate nitrogen, dissolved oxygen, etc.). By configuring corresponding sensors (such as total nitrogen sensor, nitrate nitrogen sensor, etc.) in the detection well 500, the water quality can be monitored in real time, ensuring that the water quality meets the requirements before flowing into the sedimentation tank 400 for further solid-liquid separation.

[0083] This embodiment, by configuring a detection well 500 in the system, with its inlet connected to the output port of the second generator 200 and its outlet connected to the input port of the sedimentation tank 400, enables real-time monitoring and precise control of water quality during the wastewater treatment process. As a key node for water flow monitoring, the detection well 500 can sample and test the water flowing between the second generator 200 and the sedimentation tank 400, providing water quality data support. Through this design, the system can monitor the water quality passing through the aerobic reactor in real time, especially detecting key indicators such as total nitrogen concentration, ensuring that the water quality meets requirements before flowing into the sedimentation tank. This effectively improves the accuracy of water quality monitoring, prevents substandard water from entering subsequent treatment stages, and optimizes the stability and efficiency of the wastewater treatment process. Simultaneously, centralized monitoring simplifies water quality monitoring management, reduces manual intervention, and improves the level of automation.

[0084] In some embodiments, the output port of the second generator 200 is provided with a branched conduit, the branched conduit comprising: The main road connects to the entrance of the 500 inspection well; A branch line, which connects to one end of the internal return pipe 300; A shut-off valve, which is configured in the main circuit, is used to control the on / off state of the branch circuit; The second check valve, which is configured at the inlet of the detection well 500 of the main pipeline, allows water to flow only from the second generator 200 to the detection well 500.

[0085] In this embodiment, a branch pipe is provided at the output port of the second generator 200, which divides the water flow into two paths. One path is the main path, which connects to the inlet of the detection well 500 and is used to transport the mixed liquid to the detection well 500 for final water quality testing. The outlet of the detection well 500 is then connected to the inlet of the sedimentation tank 400. The other path is a branch path, which connects to the inlet of the internal return pipe 300 and is used to return the mixed liquid to the first generator 100.

[0086] In this embodiment, the branching pipeline can be made of stainless steel. The shut-off valve is located on the main pipeline, immediately downstream of the branching pipeline, and can be connected to the pipeline via a flange. The valve body axis is aligned with the water flow direction.

[0087] This embodiment effectively controls the flow direction and flow rate of water by setting a branch pipeline at the output port of the second generator 200 and configuring a shut-off valve and a second check valve in the main pipeline. The main pipeline connects to the inlet of the detection well 500, used to send the water treated by the second generator 200 into the detection well 500 for water quality monitoring; the branch pipeline connects to one end of the internal return pipeline 300, used to return a portion of the water flow to the first generator 100. The shut-off valve is used to control the opening and closing between the main pipeline and the branch pipeline, ensuring that the return water can only flow into the internal return pipeline 300 through the branch pipeline when needed. The second check valve ensures that the water flow can only flow from the second generator 200 to the detection well 500, preventing reverse flow and ensuring the correct flow direction to avoid water pollution. Through this setting, while ensuring water quality monitoring and flow regulation, it is possible to ensure unidirectional water flow and precise control of return water, further optimizing the stability, efficiency, and safety of the wastewater treatment process.

[0088] In some embodiments, a total nitrogen sensor 510 is configured in the detection well 500 for detecting the total nitrogen concentration before the sedimentation tank 400 receives water.

[0089] In this embodiment, the total nitrogen sensor 510 may be an electrochemical total nitrogen sensor.

[0090] In this embodiment, the total nitrogen sensor 510 may be a photometric total nitrogen sensor.

[0091] In this embodiment, the total nitrogen sensor 510 may be an ion-selective electrode (ISE) total nitrogen sensor.

[0092] This embodiment, by configuring a total nitrogen sensor 510 in the detection well 500, enables real-time monitoring of the total nitrogen concentration before the influent to the sedimentation tank 400, providing crucial water quality data support for the system. The total nitrogen concentration detected by the total nitrogen sensor 510 helps evaluate the denitrification effect in the second generator 200 (aerobic reaction tank) and the first generator 100 (anoxic reaction tank), ensuring that nitrogen removal during wastewater treatment achieves the expected target. This design allows for timely adjustment of water flow or reaction conditions to further optimize the denitrification process, while ensuring that the water quality entering the sedimentation tank meets standards, thus improving the subsequent solid-liquid separation effect.

[0093] like Figure 3 As shown, in some embodiments, the precise control device for a wastewater treatment plant further includes: The control device 600 has its signal input terminals electrically connected to the flow meter 340, the liquid level sensor 120, the nitrate nitrogen sensor 210, and the total nitrogen sensor 510, respectively. The signal output terminals of the control device 600 are electrically connected to the signal input terminals of the internal reflux pump 320, the inlet electric valve 3101, the outlet electric valve 3102, and the proportional regulating valve 330, respectively.

[0094] In one possible and specific implementation, the control device 600 may be the central hardware control unit of a precision control device for a wastewater treatment plant, which realizes the physical signal linkage between sensor data acquisition and actuator command output through modular hardware design, based on structural configuration.

[0095] In this embodiment, the control device 600 can be integrated into a waterproof and dustproof control cabinet, specifically including: The processor module can be a microcontroller or a digital signal processor (DSP). It can be fixed to the back panel of the control cabinet via guide rail clips, and the processor motherboard and expansion board are connected via pin headers.

[0096] The signal input module may specifically include an analog input unit and a digital input unit. The analog input unit may be a 4-20mA input channel, which can receive analog signals from the flow meter 340, the nitrate nitrogen sensor 210, and the total nitrogen sensor 510. Furthermore, the analog input unit may also be configured with resistors and RC filter circuits to eliminate signal noise. The digital input unit may be the signal interface of the level sensor 120, capable of receiving switch signals (high / low level alarm), and may include a built-in optocoupler isolator protection circuit.

[0097] The signal output module may specifically include an analog output unit and a digital output unit. The analog output unit may include a 4-20mA output channel, which can output speed control commands to drive the proportional regulating valve 330 and the internal reflux pump 320. The digital output unit can control the opening and closing actions of the inlet electric valve 3101 and the outlet electric valve 3102.

[0098] The power module may specifically include a main power supply and a battery unit.

[0099] In one specific implementation, the control device 600 may include a comparator circuit. Specifically, this comparator circuit converts the 4-20mA signal from the nitrate nitrogen sensor 210 into a voltage signal (1-5V), compares it with a preset threshold voltage (adjustable by a preset potentiometer), and outputs a signal to drive the inverter module of the internal reflux pump 320, thereby linearly adjusting the motor speed of the internal reflux pump 320. That is, when the nitrate nitrogen voltage signal > threshold voltage → the comparator outputs a high level → the inverter increases the frequency → the pump speed increases. When the nitrate nitrogen voltage signal ≤ threshold voltage → the comparator outputs a low level → the inverter decreases the frequency → the pump speed decreases.

[0100] In one specific implementation, the control device 600 may also include a relay group that can receive a switching signal (high level = normal, low level = over-limit) output from the level sensor 120, thereby controlling the inlet electric valve 3101 (normally open relay) and the outlet electric valve 3102 (normally closed relay). Normal level (high level) → inlet electric valve 3101 is energized and opens, outlet electric valve 3102 is de-energized and closes; over-limit level (low level) → inlet electric valve 3101 is de-energized and closes, outlet electric valve 3102 is energized and opens.

[0101] In one specific implementation, the nitrate nitrogen sensor 210 monitors the nitrate concentration in the aerobic reactor in real time. The control device 600 compares this concentration value with a preset target concentration. If the nitrate nitrogen concentration is too high (usually indicating incomplete denitrification), the return water flow is increased, thereby increasing the flow rate of the internal return pump 320 to return more nitrate-containing water to the anoxic reaction zone. The control device 600 can adjust the operating frequency or speed of the internal return pump 320 based on the deviation in nitrate nitrogen concentration. For example, when the concentration is high, the speed of the internal return pump 320 will be increased, increasing the return water flow rate; while when the nitrate nitrogen concentration drops to the target range, the pump speed will be reduced or the pump will stop operating. The flow meter 340 monitors the return water flow rate to ensure that the flow rate remains within a preset range. If the flow rate is too low, the control device 600 increases the pump speed of the internal return pump 320 or activates a standby pump; if the flow rate is too high, it reduces the pump speed or shuts down some return water pumps to avoid excessive water flow affecting the reaction efficiency in the reactor. If the level sensor 120 detects that the liquid level in the tank is too high, the control device 600 can reduce the flow rate of the internal return pump 320 to lower the liquid level, preventing overflow or excessive water flow into the reaction tank. Conversely, if the liquid level is too low, the control device 600 will increase the flow rate of the internal return pump 320 to ensure that the reaction tank has sufficient water for treatment.

[0102] This embodiment configures a control device 600, whose signal input terminals are electrically connected to a flow meter 340, a level sensor 120, a nitrate nitrogen sensor 210, and a total nitrogen sensor 510, respectively, enabling real-time acquisition of various water quality and operational parameter data. The control device 600 dynamically adjusts the operating status of each component based on this real-time data. Its signal output terminals are connected to the signal input terminals of the internal return pump 320, the inlet electric valve 3101, the outlet electric valve 3102, and the proportional regulating valve 330, respectively, to precisely control water flow, pump speed, and valve opening. This design enables automated adjustment of various parameters during wastewater treatment, improving the system's response speed and accuracy. Through automated control, the control device 600 can adjust the water flow and return flow in real time based on the monitored level, flow rate, nitrate nitrogen, and total nitrogen concentrations, ensuring that the treatment effect is always maintained at the preset state. This reduces manual intervention, improves system stability, energy efficiency, and operational efficiency, ultimately enhancing the wastewater treatment effect and automation level.

[0103] This embodiment provides a wastewater treatment system, including: the wastewater treatment plant precision control device provided in the above embodiment. Specifically, the wastewater treatment system may further include: an anaerobic reactor, the output port of which can be connected to the input port of a first generator 100.

[0104] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0105] Optionally, specific examples in this embodiment can refer to the examples described in the above embodiments, and will not be repeated here.

[0106] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0107] In the above embodiments of this application, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0108] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A precise control device for a sewage treatment plant, characterized in that, include: The first generator, which is used to perform the denitrification reaction, has an inlet, an internal reflux inlet, and an outlet; wherein, the inlet of the first generator is used to receive the wastewater to be treated; The second generator, which is used to perform the aerobic reaction, has its input port connected to the output port of the first generator; An internal return pipeline is provided, with one end connected to the output port of the second generator and the other end connected to the internal return port of the first generator; wherein, a buffer tank is configured in the internal return pipeline to regulate the flow rate of the return water. The sedimentation tank has its inlet connected to the outlet of the second generator for solid-liquid separation.

2. A precise control device for a sewage treatment plant according to claim 1, characterized in that, The internal return pipeline also includes: An internal reflux pump is installed between one end of the internal reflux pipeline and the inlet of the buffer tank for pumping reflux water into the buffer tank; wherein an inlet electric valve is provided at the inlet of the buffer tank and an outlet electric valve is provided at the outlet of the buffer tank.

3. A precise control device for a sewage treatment plant according to claim 2, characterized in that, The internal return pipeline also includes: A proportional control valve is configured between the outlet of the buffer tank and the internal reflux port of the first generator; A flow meter is configured between the proportional control valve and the outlet of the buffer tank.

4. A precise control device for a sewage treatment plant according to claim 3, characterized in that, The internal reflux port of the first generator is equipped with a first check valve.

5. A precise control device for a sewage treatment plant according to any one of claims 3-4, characterized in that, A liquid level sensor is installed inside the first generator to detect the liquid level height of the first generator; a nitrate nitrogen sensor is installed inside the second generator and at the output port to detect the nitrate nitrogen concentration in the second generator.

6. A precise control device for a sewage treatment plant according to claim 5, characterized in that, Also includes: The well has its inlet connected to the output port of the second generator and its outlet connected to the input port of the sedimentation tank.

7. A precise control device for a sewage treatment plant according to claim 6, characterized in that, The output port of the second generator is provided with a branched pipeline, the branched pipeline including: The main road connects to the entrance of the inspection well; A branch line, which connects to one end of the internal return pipe; A shut-off valve, which is configured in the main circuit, is used to control the on / off state of the main circuit; The second check valve, which is configured at the inlet end of the detection well in the main pipeline, allows water to flow only from the second generator to the detection well.

8. A precise control device for a sewage treatment plant according to claim 6, characterized in that, The detection well is equipped with a total nitrogen sensor to detect the total nitrogen concentration before the sedimentation tank is filled with water.

9. A precise control device for a sewage treatment plant according to claim 8, characterized in that, Also includes: The control device has its signal input terminals electrically connected to the flow meter, liquid level sensor, nitrate nitrogen sensor and total nitrogen sensor, respectively, and its signal output terminals electrically connected to the signal input terminals of the internal reflux pump, inlet electric valve, outlet electric valve and proportional regulating valve, respectively.

10. A sewage treatment system characterised in that, include: A precision control device for a wastewater treatment plant as described in any one of claims 1-9.

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