Integrated A / O Alternating Wastewater Treatment Method and System Based on Time-Sequence Coupling

Abstract

This application relates to the technical field of wastewater treatment control, and discloses an integrated A / O alternating wastewater treatment method and system based on time-series coupling. The method includes: pumping a first volume of wastewater into a wastewater treatment tank and adding a first weight of nutrients; controlling a stirring motor to operate at a first speed for a first duration; acquiring a dissolved oxygen value, calculating the ratio of the dissolved oxygen value to a first threshold as the dissolved oxygen ratio, and adjusting the first speed according to a positive correlation with the dissolved oxygen ratio; controlling an aeration blower to operate at a first flow rate for a second duration, and controlling the stirring motor to continue stirring at a second speed; acquiring a redox value, calculating the ratio of the redox value to a second threshold as the redox ratio, adjusting the first flow rate according to a negative correlation with the redox ratio, and adjusting the second speed according to a negative correlation with the redox ratio; controlling the stirring motor and the aeration blower to stop simultaneously for a third duration; and discharging water from the wastewater treatment tank.

Description

Technical Field

[0001] This application relates to the technical field of wastewater treatment control, and in particular to an integrated A / O alternating wastewater treatment method and system based on time-series coupling. Background Technology

[0002] The A / O process is a mainstream anaerobic-aerobic biological treatment technology in the wastewater treatment field. Its core principle is the synergistic effect of the anaerobic and aerobic stages, utilizing the metabolic activities of facultative anaerobic and aerobic bacteria to simultaneously degrade organic matter and remove nitrogen from wastewater. It boasts advantages such as simple structure, stable treatment efficiency, and low operating costs. Due to its good adaptability to urban domestic sewage and low-to-medium concentration organic industrial wastewater, this process is widely used in small and medium-sized wastewater treatment projects, becoming one of the key technologies for water pollution control.

[0003] For example, CN108585205A discloses an A / O wastewater treatment device that achieves structural integration by dividing the anaerobic and aerobic zones within a single housing using a partition. In such devices, the A / O functional areas are physically separated, and multiple zones operate in parallel, requiring a water flow switching mechanism to achieve operational mode switching.

[0004] In existing A / O wastewater treatment devices, the aeration system and the mixing system are usually independent hardware structures with separate operation and control logic: the aeration system is only responsible for oxygenation in the aerobic section, and the mixing system is only responsible for mixing in the anaerobic section. There is a lack of hardware integration and deep coordination of execution logic between the two. This design leads to functional redundancy and energy waste during equipment operation. Summary of the Invention

[0005] To reduce energy consumption in wastewater treatment, this application provides an integrated A / O alternating wastewater treatment method and system based on time-series coupling.

[0006] Firstly, this application provides an integrated A / O alternating wastewater treatment method based on time-series coupling, employing the following technical solution: An integrated A / O alternating wastewater treatment method based on time-series coupling is disclosed. The wastewater treatment tank has a hollow horizontal stirring rod in its center, connected to a stirring motor located outside the tank. The stirring rod has stirring blades and aeration holes. The end of the stirring rod furthest from the stirring motor is connected to an aeration fan via an aeration pipe. A sludge hopper is located at the bottom of the tank, with a flow hole at the top. An inlet module is located next to the sludge hopper. A DO sensor, an ORP sensor, a nutrient source dosing module, and an effluent module are located at the top of the tank. A control module is electrically connected to the DO and ORP sensors, and this control module is electrically connected to the inlet module, stirring motor, aeration fan, nutrient source dosing module, and effluent module. The control module performs the following steps: Step S1: Control the inlet module to pump a preset first volume of sewage into the sewage treatment tank, and control the nutrient source addition module to add a preset first weight of nutrients. Step S2: Control the stirring motor to start stirring and continue stirring at a preset first speed for a first duration; acquire the dissolved oxygen value of the DO sensor in real time, calculate the ratio of the dissolved oxygen value to a preset first threshold as the dissolved oxygen ratio value, and adjust the first speed according to the positive correlation of the dissolved oxygen ratio value; Step S3: Control the aeration blower to start aeration and maintain it at a preset first flow rate for a second duration. At the same time, control the stirring motor to continue stirring at a second speed, wherein the second duration is longer than the first duration and the second speed is greater than the first speed; acquire the redox value of the ORP sensor in real time, calculate the ratio of the redox value to a preset second threshold as the redox ratio, adjust the first flow rate according to the negative correlation of the redox ratio, and adjust the second speed according to the negative correlation of the redox ratio. Step S4: Control the stirring motor and the aeration blower to stop simultaneously for a third duration, wherein the third duration is not less than the first duration; Step S5: Control the water outlet module to discharge water from the sewage treatment tank; Step S6: Repeat steps S1 to S5.

[0007] By adopting the above technical solution, the mixing blades and aeration holes are integrated through a horizontal mixing rod, and the mixing motor and aeration blower are linked by aeration pipes to achieve hardware linkage. The control module links with the DO sensor and ORP sensor, dynamically adjusting the first speed of the mixing motor according to the dissolved oxygen ratio, and dynamically adjusting the first flow rate of the aeration blower and the second speed of the mixing motor according to the oxidation-reduction ratio, so that the mixing speed, aeration flow rate and dissolved oxygen value and oxidation-reduction value are precisely matched. In terms of timing, the influent module pumps in the first volume of sewage, the nutrient source addition module adds the first weight of nutrients, and then the mixing motor runs at the first speed for the first time, the aeration blower runs at the first flow rate and the mixing motor at the second speed for the second time, and the two stop running for the third time in a cycle. This maintains a stable alternation of anaerobic and aerobic environments, adapts to the metabolic needs of microorganisms, and is conducive to improving the denitrification and organic matter degradation effects of sewage. It also improves the timing coordination of system operation, so that the operating status of each module dynamically adapts to water quality changes, reduces energy waste, improves the uniformity of water quality in the sewage treatment tank, and ensures the treatment quality and efficiency of the water discharged from the effluent module.

[0008] Furthermore, the method also includes the following steps: Dissolved oxygen values ​​are acquired and saved to a dissolved oxygen sequence in a preset first cycle. The dissolved oxygen sequence is smoothed according to a preset first window to obtain a dissolved oxygen calculation component. The latest dissolved oxygen sensing component is acquired through a DO sensor. The dissolved oxygen sensing component and the dissolved oxygen calculation component are weighted and averaged to calculate the dissolved oxygen value. Calculate the fluctuation value of dissolved oxygen in the first window, take the absolute value of the fluctuation value as the absolute value of the fluctuation, and calculate the ratio of the absolute value of the fluctuation to the preset fluctuation reference value as the fluctuation ratio. If the absolute value of the fluctuation is less than the reference value of the fluctuation, the weight corresponding to the next weighted average calculation of the dissolved oxygen calculation component is adjusted according to the negative correlation of the fluctuation ratio; otherwise, an alarm control component is applied to the stirring motor, and the period of the alarm control component is adjusted according to the negative correlation of the fluctuation ratio.

[0009] By adopting the above technical solutions, the dissolved oxygen values ​​acquired by the DO sensor are sequence preserved, windowed smoothed, and weighted averaged, thereby improving the stability of dissolved oxygen data and making the dissolved oxygen values ​​more consistent with the actual water quality. By combining the judgment of fluctuation values ​​and fluctuation ratios, the system dynamically adapts to the fluctuation changes of dissolved oxygen data and adaptively adjusts the period of the alarm control component applied to the stirring motor, which helps to improve the system's responsiveness to water quality fluctuations and maintain the coordinated matching between the operation of the stirring system and the dissolved oxygen state.

[0010] Furthermore, the method also includes the following steps: Obtain the dissolved oxygen sequence corresponding to step S2 in multiple batches of wastewater treatment; Dissolved oxygen curves fitted based on the dissolved oxygen sequence of each batch; Calculate the duration of the dissolved oxygen curve decrease, and calculate the trend value of the decrease duration based on the decrease duration corresponding to multiple batches; The ratio of the downward trend value to the preset downward reference value is the downward ratio. The first duration is adjusted according to the positive correlation of the downward ratio.

[0011] By adopting the above technical solution, the first duration can be adjusted based on the ratio of the descent duration, which can adaptively adapt to the changes in water quality in the anaerobic section and improve the matching degree between the first duration and the actual working conditions of the process.

[0012] Furthermore, the method also includes the following steps: When adjusting the first rotation speed according to the positive correlation of the dissolved oxygen ratio, the adjustable range of the first rotation speed is the first adjustable range. The adjustment step size of the first rotational speed and the range of the first adjustable range are adjusted based on the negative correlation between the ratio of descent time and the ratio of descent time.

[0013] By adopting the above technical solution, the adjustable range and adjustment step of the first speed can be changed dynamically to adapt to changes in dissolved oxygen, thereby improving the matching degree between the stirring speed and the water quality state. This helps to maintain the synergy of the anaerobic section operation and reduce energy consumption fluctuations caused by improper adjustment of the stirring motor speed.

[0014] Furthermore, the method also includes the following steps: Redox values ​​are acquired and saved to the redox sequence at a preset second period. The latest redox sensing components are acquired through the ORP sensor. The redox values ​​are obtained by window weighted averaging of the redox sequence based on a preset second window. The more recent the acquisition time of the redox sensing components, the greater the weight. Calculate the average redox value in the second window, and calculate the ratio of the average value to the preset average reference value as the average ratio; If the average value is greater than the preset average reference value, the weight of the next window weighted average calculation of the latest redox sensing component is adjusted according to the positive correlation of the average ratio; otherwise, an alarm control component is applied to the aeration blower, and the period of the alarm control component is adjusted according to the positive correlation of the average ratio.

[0015] By adopting the above technical solutions, the timeliness and stability of oxidation-reduction data are improved by preserving the sequence of oxidation-reduction values ​​and performing window-weighted averaging. By combining the average value and average ratio to dynamically adapt the weight of the latest oxidation-reduction sensing components, the cycle of the aeration fan alarm control component is adaptively adjusted, which helps to maintain the matching state between aeration operation and oxidation-reduction status, and improves the system's responsiveness to changes in water quality in the aerobic section.

[0016] Furthermore, the method also includes the following steps: Obtain the redox sequences corresponding to step S3 of wastewater treatment in multiple batches; The redox curves were fitted based on the redox sequences of each batch; Calculate the rise time of the redox curve, and calculate the rise time trend value based on the rise time corresponding to multiple batches; The ratio of the rising duration trend value to the preset rising duration reference value is calculated as the rising duration ratio. The second duration is adjusted according to the positive correlation of the rising duration ratio.

[0017] By adopting the above technical solution, the second duration can be adjusted based on the rise duration ratio, which can adaptively match the actual working conditions of the aerobic stage and improve the matching degree between the second duration and the water quality status.

[0018] Furthermore, the method also includes the following steps: When adjusting the first flow rate based on the negative correlation of the redox ratio, the adjustable range of the first flow rate is the second adjustable range; The adjustment step size of the first flow rate and the range of the second adjustable range are adjusted based on the positive correlation between the rise time ratio and the rise time ratio.

[0019] By adopting the above technical solution, the adjustment step size of the first flow rate and the range of the second adjustable range are adjusted based on the rise time ratio, which can adaptively adapt to the water quality changes in the aerobic section.

[0020] Furthermore, the method also includes the following steps: The timing is obtained by starting the timing after the nutrient source addition module completes the addition process; The real-time speed is obtained by superimposing the first speed of the stirring motor with the temporary speed. The control module controls the stirring motor according to the real-time speed. The temporary speed is set to be negatively correlated with the dispensing time. If the deployment time exceeds the preset reference time, the temporary rotation speed is set to zero, where the reference time is less than the first duration.

[0021] By adopting the above technical solution and adjusting the negative correlation between the temporary rotation speed and the timing of nutrient addition, the stirring motor can be temporarily accelerated when the nutrient source is added, which can adapt to the process requirements of mixing the nutrient source and wastewater in the anaerobic stage, improve the matching degree between the real-time rotation speed and the addition stage, and help maintain the uniform substrate environment required for the denitrification reaction.

[0022] Secondly, this application provides an integrated A / O alternating wastewater treatment system based on time-series coupling, employing the following technical solution: An integrated A / O alternating wastewater treatment system based on time-series coupling includes a processor, wherein the processor executes the steps of the integrated A / O alternating wastewater treatment method based on time-series coupling as described in any one of the preceding claims. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the hardware structure of an integrated A / O alternating wastewater treatment system based on time-series coupling.

[0024] Figure 2 This is a schematic diagram of the integrated A / O alternating wastewater treatment method based on time-series coupling.

[0025] Attached reference numerals: 1. Aeration blower; 2. Air volume regulating valve; 3. Horizontal stirring rod; 4. Aeration hole; 5. Flow hole; 6. Sludge hopper; 7. Sludge discharge port; 8. Stirring motor; 9. Water effluent module; 10. Stirring blades; 11. DO sensor; 12. ORP sensor; 13. Nutrient source addition module; 14. Control module; 15. Water inlet module. Detailed Implementation

[0026] The embodiments of this application are described in detail below, and examples of the embodiments are shown in the accompanying drawings.

[0027] This application discloses an integrated A / O alternating wastewater treatment method based on time-series coupling, referring to... Figure 1 and Figure 2 Based on the wastewater treatment tank, a hollow horizontal stirring rod 3 is rotatably mounted in the middle of the tank via bearings. The horizontal stirring rod 3 is connected to a stirring motor 8 located outside the wastewater treatment tank. Multiple stirring blades 10 and multiple aeration holes 4 are provided on the horizontal stirring rod 3. The stirring plane of the stirring blades 10 is a vertical plane, and the aeration holes 4 are distributed on the surface of the horizontal stirring rod 3. The end of the horizontal stirring rod 3 furthest from the stirring motor 8 is connected to an aeration fan 1 via an aeration pipe. Both the aeration pipe and the aeration fan 1 are located outside the wastewater treatment tank, and an airflow regulating valve 2 is also installed on the aeration pipe.

[0028] The wastewater treatment tank has a sludge hopper 6 at the bottom, an overflow hole 5 at the top, and a sludge discharge port 7 at the bottom. An inlet is located next to the sludge hopper 6, and an inlet module 15 is installed in the inlet. The top of the wastewater treatment tank has a DO sensor 11, an ORP sensor 12, a nutrient source addition module 13, and an outlet. An outlet module 9 is installed at the outlet. Both the inlet module 15 and the outlet module 9 can be pumped. The nutrient source addition module 13 can be a feeding hopper with a weighing module. A control module 14 is electrically connected to the DO sensor 11 and the ORP sensor 12. The control module 14 is electrically connected to the inlet module 15, the stirring motor 8, the aeration fan 1, the nutrient source addition module 13, and the outlet module 9. The control module 14 can use a PLC, such as a Siemens S7-1200 PLC, which can communicate with a host computer via Ethernet. The PLC has a pre-installed cycle program.

[0029] Control module 14 performs the following steps: Step S1: Control the influent module 15 to pump a preset first volume of sewage into the sewage treatment tank, and control the nutrient source addition module 13 to add a preset first weight of nutrients. The first volume can be the maximum treatment volume of the sewage treatment tank, and the first weight can be the maximum weight corresponding to the maximum treatment volume. The influent is simulated municipal sewage with COD=300mg / L and NH4+. + -N=30mg / L, TN=40mg / L.

[0030] Step S2: Control the stirring motor 8 to start stirring and maintain it at a first speed for a first duration. The dissolved oxygen value from the DO sensor 11 is acquired in real time, and the ratio of the dissolved oxygen value to a preset first threshold is calculated as the dissolved oxygen ratio. The first speed is adjusted based on the positive correlation of the dissolved oxygen ratio. The stirring motor 8 is controlled by a frequency converter. The control module 14 controls the frequency converter to change the operating frequency of the stirring motor 8, thereby adjusting the speed of the stirring motor 8. The first duration can be set to 60 minutes. After the nutrient source addition module 13 completes addition, a timing is started to obtain the addition time. The real-time speed is obtained by adding a temporary speed to the preset first speed of the stirring motor 8. The temporary speed can be 10% of the first speed. The control module 14 controls the stirring motor 8 according to the real-time speed, where the temporary speed is negatively correlated with the addition time. If the addition time is greater than a preset reference time, the temporary speed is set to zero, where the reference time is less than the first duration. For example, if the addition time is 4 minutes and the reference time is 3 minutes; when the addition time is 0, the stirring motor 8 speed is 110% of the first speed; when the addition time is 3 minutes, the stirring motor 8 speed is 100% of the first speed. By adjusting the temporary rotation speed and the timing of nutrient addition, the stirring motor 8 can be temporarily accelerated during nutrient addition, adapting to process requirements and improving the matching degree between the real-time rotation speed and the addition stage, which is conducive to maintaining a uniform substrate environment required for denitrification.

[0031] DO sensor 11, short for Dissolved Oxygen Sensor, is a water quality monitoring device used to monitor the dissolved oxygen concentration in water bodies in real time. It is widely used in A / O wastewater treatment processes, aquaculture, and water environment monitoring. In A / O wastewater treatment scenarios, the dissolved oxygen concentration data collected by DO sensor 11 forms a dynamically adapted closed-loop relationship with the rotation speed of stirring motor 8. The rotation speed of stirring motor 8 is adjusted through DO data feedback. DO sensor 11 monitors the dissolved oxygen (DO) concentration in wastewater in real time and outputs a dissolved oxygen value. The dissolved oxygen value directly reflects the "oxygen environment state" and "mixing uniformity" of the current operating conditions. The core function of stirring motor 8 is to control the degree of wastewater mixing, affecting oxygen transfer efficiency, sludge suspension state, substrate distribution, and other operating conditions. The two are linked through control module 14: when the dissolved oxygen value deviates from the first threshold of the operating conditions, the rotation speed of stirring motor 8 is adjusted to correct the mixing effect, ultimately bringing the dissolved oxygen value back to the target range while avoiding energy waste.

[0032] This step is the anaerobic stage. In the anaerobic stage, the dissolved oxygen level limits the stirring intensity to ensure an anaerobic environment. For example, the operating condition requires the dissolved oxygen level to be controlled at <0.5mg / L to avoid oxygen inhibiting the activity of denitrifying bacteria and fermenting bacteria. At the same time, stirring prevents activated sludge from settling and ensures sufficient contact between microorganisms and the substrate.

[0033] If the dissolved oxygen value is greater than the first threshold, such as >0.5mg / L, then the dissolved oxygen ratio is greater than 1. At this time, the speed of the stirring motor 8 is increased according to the dissolved oxygen ratio based on the proportional algorithm to ensure that the sludge, sewage and nutrient source are mixed quickly and the dissolved oxygen value is reduced to the anaerobic standard. If the dissolved oxygen value is less than the first threshold, such as less than 0.5 mg / L, it meets the anaerobic requirements, and the dissolved oxygen ratio is less than 1. Based on the dissolved oxygen ratio, the speed of the stirring motor 8 should be reduced proportionally, or the first or minimum speed should be maintained—ensuring that the sludge does not settle and the substrate is evenly distributed. In special circumstances where the dissolved oxygen value in the anaerobic section continuously exceeds the standard, in addition to reducing the speed of the stirring motor 8, it is also necessary to check whether the aeration system is properly shut down, forming a coordinated control system of dissolved oxygen value, stirring motor 8, and aeration blower 1.

[0034] Dissolved oxygen values ​​are acquired and saved to the dissolved oxygen sequence at a preset first period, which can be 5-10 seconds. The dissolved oxygen sequence is smoothed according to a preset first window to obtain the dissolved oxygen calculated component. The length of the first window can be 6 data points. The latest dissolved oxygen sensing component is acquired through DO sensor 11. The dissolved oxygen value is calculated by weighting the dissolved oxygen sensing component and the dissolved oxygen calculated component. For example, the weight of the dissolved oxygen sensing component is 0.6, the weight of the dissolved oxygen calculated component is 0.4, and the sum of the two is 1.

[0035] The fluctuation value of dissolved oxygen in the first window is calculated, and the absolute value of the fluctuation is taken as the absolute value of the fluctuation. The fluctuation value can be calculated using the standard deviation algorithm. If it is the standard deviation, there is no need to take the absolute value. The ratio of the absolute value of the fluctuation to the preset fluctuation reference value is the fluctuation ratio. If the absolute value of the fluctuation is less than the fluctuation reference value, the weight corresponding to the next weighted average calculation of the dissolved oxygen calculation component is adjusted according to the negative correlation of the fluctuation ratio. The fluctuation ratio can be directly multiplied by the weight of the dissolved oxygen calculation component, and then the weight of the dissolved oxygen sensing component is adjusted accordingly. Otherwise, an alarm control component is applied to the stirring motor 8. The alarm control component is an intermittent "hum-stop-hum-stop" sound generated by the intermittent start-stop motor to achieve rapid start and stop, for example, 1 second start + 1 second stop and cycle. The period of the alarm control component is adjusted according to the negative correlation of the fluctuation ratio. The larger the fluctuation ratio, the shorter the period and the higher the frequency of the alarm sound. Conversely, the smaller the fluctuation ratio, the longer the period and the lower the frequency of the alarm sound.

[0036] The dissolved oxygen values ​​acquired by the DO sensor 11 are subjected to sequence preservation, window smoothing, and weighted average calculation to improve the stability of dissolved oxygen data and make the dissolved oxygen values ​​more consistent with the actual water quality. By combining the judgment of fluctuation value and fluctuation ratio, the fluctuation changes of dissolved oxygen data are dynamically adapted, and the period of the alarm control component applied to the stirring motor 8 is adaptively adjusted, which helps to improve the system's response adaptability to water quality fluctuations and helps to maintain the coordinated matching between the operation of the stirring system and the dissolved oxygen state.

[0037] Obtain dissolved oxygen (DO) sequences corresponding to step S2 in multiple batches of wastewater treatment. Based on the DO sequence of each batch, a DO curve is fitted. The DO curve is a decreasing curve, and in the anaerobic stage, the value change of DO sensor 11 follows a pattern of "rapid precipitous drop → ultra-low value stabilization → maintenance before switching". Calculate the duration of the DO curve's decrease, and based on the decrease duration corresponding to multiple batches, calculate the decreasing duration trend value. The decreasing duration trend value can be expressed as the time increase in decreasing duration divided by each batch.

[0038] The ratio of the trend value of the descent time to the preset reference value of the descent time is called the descent time ratio. The first duration is adjusted based on a positive correlation with this ratio. When the descent time ratio increases, the first duration is extended to ensure anaerobic efficiency; when the descent time ratio decreases, the first duration is shortened to reduce process time and energy consumption. Adjusting the first duration based on the descent time ratio allows for adaptive adaptation to changes in water quality during the anaerobic stage, improving the match between the first duration and actual process conditions.

[0039] When adjusting the first rotational speed based on a positive correlation with the dissolved oxygen ratio, the adjustable range of the first rotational speed is defined as the first adjustable range. When adjusting the first rotational speed based on a negative correlation with the descent time ratio, the adjustment step size and range of the first adjustable range are adjusted. When the descent time ratio is large, the adjustment step size and range of the first rotational speed should be reduced; for example, the adjustment ratio of the first rotational speed and the minimum and maximum values ​​of the stirring motor 8 speed should be reduced to prevent excessive gas-liquid mixing. When the descent time ratio is small, the adjustment step size and range of the first rotational speed should be increased to accelerate gas-liquid mixing and shorten the process time. Dynamically adapting the adjustable range and adjustment step size of the first rotational speed to changes in dissolved oxygen improves the matching degree between the stirring speed and the water quality state, helps maintain the synergy of the anaerobic section operation, and helps reduce energy consumption fluctuations caused by improper adjustment of the stirring motor 8 speed.

[0040] Step S3: Control the aeration blower 1 to start aeration and maintain it at a preset first flow rate for a second duration. Simultaneously, control the stirring motor 8 to continue stirring at a second rotation speed, where the second duration is longer than the first duration and the second rotation speed is greater than the first rotation speed. Real-time acquisition of the oxidation-reduction value from the ORP sensor 12 is performed, and the ratio of the ORP value to a preset second threshold is calculated as the ORP ratio. The first flow rate and the second rotation speed are adjusted based on the negative correlation of the ORP ratio. The aeration blower 1 is controlled by a frequency converter. The control module 14 controls the frequency converter to change the operating frequency of the aeration blower 1, thereby changing the rotation speed of the aeration blower 1 and thus adjusting the flow rate. Alternatively, without changing the operating parameters of the aeration blower 1, the control module 14 controls the opening and closing degree of the airflow regulating valve 2 to adjust the flow rate.

[0041] The second duration can be set to 120 minutes. In the A / O process wastewater treatment scenario, this step is the aerobic stage. ORP sensor 12 is a redox potential sensor used to collect redox values. These values ​​provide feedback on the redox state of the water body, dynamically adjusting the flow rate of aeration blower 1 to match the process's requirements for the redox environment. Redox values ​​reflect the oxidized substances in the water, such as O2 and NO3. - With reduced substances such as organic matter and NH4 + The relative proportion of oxidation and reduction values ​​directly characterizes the oxidation or reduction intensity. The higher the oxidation-reduction value, the stronger the oxidation capacity of the water body, with sufficient oxygen content and a high proportion of oxidized substances; the lower the oxidation-reduction value, the stronger the reduction capacity of the water body, with extremely low oxygen content and a high proportion of reduced substances.

[0042] The flow rate of aerator 1 directly determines the amount of oxygen input into the water body, which is the core means of regulating the oxidation-reduction state of the water. The two form a closed loop through the control system: when the oxidation-reduction value deviates from the second threshold of the operating conditions, the flow rate of aerator 1 is adjusted to change the oxygen input intensity, ultimately pulling the oxidation-reduction state of the water back to the target range, while avoiding insufficient or excessive oxygen supply. To maintain a strong oxidizing environment, the oxidation-reduction value is typically +200mV to +400mV, meeting the metabolic needs of nitrifying bacteria for ammonia nitrogen oxidation and heterotrophic bacteria for organic matter degradation. At this point, oxygen is the core reaction substrate. If the oxidation-reduction value is < the second threshold (e.g., < +300mV): it indicates insufficient oxidation intensity in the water body, possibly due to insufficient oxygen input, low aeration flow rate, or excessive pollutant load. In this case, the flow rate of aerator 1 needs to be increased to enhance the oxygen input rate, strengthen the water's oxidation capacity, and push the oxidation-reduction value up to the target range, ensuring sufficient nitrification and organic matter degradation. If the oxidation-reduction value is greater than the second threshold (e.g., > +300mV), it indicates excessive oxidation of the water, an oversupply of oxygen, and an excessively high aeration flow rate. In this case, reduce the flow rate of aeration blower 1 to reduce unnecessary oxygen input, avoid energy waste, and prevent sludge floc breakage or diminishing marginal returns in nitrification efficiency due to excessive oxidation. Controlling the flow rate of aeration blower 1 while also controlling the speed of the mixing motor 8 ensures thorough mixing of oxygen, improving the mixing effect of newly added oxygen and enhancing the reaction efficiency of the aerobic stage.

[0043] Redox values ​​are acquired and saved to the redox sequence at a preset second period, which can be 3-6 seconds. The latest redox sensing component is acquired through ORP sensor 12. The redox value is calculated by window-weighted averaging of the redox sequence based on a preset second window, which can contain 10 data points. The more recent the redox sensing component is acquired, the greater its weight. For example, the weights can be: 0.25, 0.25, 0.25, 0.25, 0.5, 0.5, 0.5, 0.5, 1, and 6. The average value of the redox values ​​in the second window is calculated, and the ratio of the average value to the preset average reference value is the average ratio. If the average value is greater than the preset average reference value, the weight corresponding to the next window-weighted averaging calculation of the latest redox sensing component is adjusted according to the positive correlation of the average ratio. For example, the weight 6 in the above-mentioned weight is amplified using a proportional method. Otherwise, an alarm control component is applied to the aeration blower 1. The alarm control component is an intermittent "hum-stop-hum-stop" sound generated by the intermittent start-stop of the blower to achieve rapid start and stop, for example, 1 second start + 1 second stop, and the cycle repeats. The alarm control component's period is adjusted based on a positive correlation with the average ratio. A smaller average ratio shortens the period and increases the alarm frequency, while a larger average ratio lengthens the period and reduces the alarm frequency. Sequence preservation and window-weighted averaging of oxidation-reduction (OR) values ​​improve the timeliness and stability of the OR data. The weights of the latest OR sensing components are dynamically adapted using the average value and average ratio, adaptively adjusting the period of the alarm control component for aeration fan 1. This helps maintain a match between aeration operation and OR status, improving the system's responsiveness to changes in water quality in the aerobic section.

[0044] Oxidation-reduction (OR) sequences corresponding to multiple batches of wastewater treatment step S3 are obtained. An ORP curve is fitted based on the ORP sequence of each batch; this curve is an ascending curve. In the aerobic stage, the value change of ORP sensor 12 follows a pattern of "rapid rise → high value stability → maintenance". The rise duration of the ORP curve is calculated, and the rise duration trend value is calculated based on the rise duration corresponding to multiple batches. The rise duration trend value can be expressed as the increase in rise duration time divided by each batch.

[0045] The ratio of the rising duration trend value to the preset rising duration reference value is called the rising duration ratio. The second duration is adjusted based on a positive correlation with this ratio. When the rising duration ratio increases, the second duration is extended to ensure aerobic performance; when the rising duration ratio decreases, the second duration is shortened to reduce process time and energy consumption. Adjusting the second duration based on the rising duration ratio allows for adaptive adaptation to the actual operating conditions of the aerobic stage, improving the match between the second duration and water quality conditions.

[0046] When adjusting the first flow rate based on a negative correlation with the redox ratio, the adjustable range of the first flow rate becomes the second adjustable range. When adjusting the adjustment step size of the first flow rate and the range of the second adjustable range based on a positive correlation with the rise time ratio, a proportional coefficient adjustment method can be used. When the rise time ratio is small, the adjustment step size and range of the first flow rate should be reduced; for example, by reducing the proportion of the first flow rate adjustment and the minimum and maximum values ​​of the aeration fan speed 1, to prevent over-oxygenation. When the rise time ratio is large, the adjustment step size and range of the first flow rate should be increased to accelerate gas-liquid mixing and shorten the process time. Adjusting the adjustment step size of the first flow rate and the range of the second adjustable range based on the rise time ratio allows for adaptive adaptation to water quality changes in the aerobic section.

[0047] Step S4: Control the stirring motor 8 and the aeration blower 1 to stop simultaneously for a third duration, wherein the third duration is not less than the first duration. The third duration can be the same as the first duration, both being 60 minutes, or longer than 60 minutes, to allow the substances in the sewage treatment tank to settle.

[0048] Step S5: Control the water outlet module 9 to discharge water from the sewage treatment tank. The drainage process can be completed in 30 minutes.

[0049] Step S6: Repeat steps S1 to S5.

[0050] The horizontal stirring rod 3 integrates the stirring blades 10 and the aeration holes 4, and the aeration pipes are used to achieve hardware linkage between the stirring motor 8 and the aeration fan 1. The control module 14 links the DO sensor 11 and the ORP sensor 12, and dynamically adjusts the first speed of the stirring motor 8 according to the dissolved oxygen ratio, and dynamically adjusts the first flow rate of the aeration fan 1 and the second speed of the stirring motor 8 according to the oxidation-reduction ratio, so that the stirring speed, aeration flow rate and dissolved oxygen value and oxidation-reduction value are precisely matched. The system operates in a sequential manner, with the first volume of wastewater pumped in by the inlet module 15, the first weight of nutrients added by the nutrient source addition module 13, followed by a cycle of the stirring motor 8 running at its first speed for a first duration, the aeration blower 1 operating at its first flow rate and the stirring motor 8 at its second speed for a second duration, and then both stopping for a third duration. This cycle maintains a stable alternation between anaerobic and aerobic environments, adapting to the metabolic needs of microorganisms, improving wastewater denitrification and organic matter degradation, enhancing the sequential coordination of system operation, dynamically adapting the operating status of each module to changes in water quality, reducing energy waste, improving the uniformity of water quality within the wastewater treatment tank, and ensuring the treated water quality and efficiency discharged from the effluent module 9. A pilot-scale system was built for comparative experiments with a traditional SBR system: in terms of energy consumption, the average power consumption per unit water volume was 0.35 kWh / m³. 3 The traditional SBR system has a capacity of 0.42 kWh / m³. 3Energy savings of approximately 16.7% are achieved. In terms of treatment efficiency, the effluent total nitrogen (TN) is consistently below 10 mg / L, compared to 10-15 mg / L for traditional SBR systems. Regarding sludge properties, the sludge exhibits higher granulation and better settling performance, with the sludge viscosity (SVI) decreasing from 95 to 80.

[0051] Integrating mixing and aeration functions into a single unit, controlled by the same module 14, achieves a synergistic effect, simplifying the tank structure and reducing response delays and energy waste during switching between agitators and aerators in traditional SBR processes. Through a modular operation of pure mixing and aeration mixing, energy is allocated on demand. Actual measurements show that when treating municipal wastewater under the same standard load, it saves over 30% more electricity than the traditional A / O process and 15%-20% more electricity than the classic SBR process. Mixing and mass transfer efficiency is higher, sludge activity is stronger, and nitrogen and phosphorus removal efficiency is improved by approximately 10%-15%. Simultaneously, the ratio of the first to second time intervals can be adjusted via PLC programming to adapt to diurnal or seasonal water quality fluctuations. The single-tank design reduces the footprint by over 40%, lowering civil engineering and equipment investment, making it suitable for land-constrained urban areas, industrial parks, and rural areas.

[0052] This application also discloses an integrated A / O alternating wastewater treatment system based on time-series coupling, including a processor, wherein the processor executes the steps of the integrated A / O alternating wastewater treatment method based on time-series coupling as described in any of the above embodiments.

[0053] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. An integrated A / O alternating wastewater treatment method based on time-series coupling, characterized in that, Based on the sewage treatment tank, a hollow horizontal stirring rod (3) is set in the middle of the sewage treatment tank. The horizontal stirring rod (3) is connected to a stirring motor (8) located outside the sewage treatment tank. The horizontal stirring rod (3) is equipped with stirring blades (10) and aeration holes (4). The end of the horizontal stirring rod (3) away from the stirring motor (8) is connected to an aeration blower (1) through an aeration pipe. A sludge hopper (6) is set at the bottom of the sewage treatment tank. A flow hole (5) is set at the top of the sludge hopper (6). An inlet module (15) is set next to the sludge hopper (6). A DO sensor (11), an ORP sensor (12), a nutrient source addition module (13), and an effluent module (9) are set at the top of the sewage treatment tank. The DO sensor (11) and the ORP sensor (12) are electrically connected to a control module (14). The control module (14) is electrically connected to the inlet module (15), the stirring motor (8), the aeration blower (1), the nutrient source addition module (13), and the effluent module (9). The control module (14) performs the following steps: Step S1: Control the water inlet module (15) to pump a preset first volume of sewage into the sewage treatment tank, and control the nutrient source addition module (13) to add a preset first weight of nutrients; Step S2: Control the stirring motor (8) to start stirring and continue stirring at a preset first speed for a first duration; The dissolved oxygen value of the DO sensor (11) is acquired in real time, and the ratio of the dissolved oxygen value to the preset first threshold is calculated as the dissolved oxygen ratio. The first rotation speed is adjusted according to the positive correlation of the dissolved oxygen ratio. Step S3: Control the aeration blower (1) to start aeration and continue for a second time at a preset first flow rate. At the same time, control the stirring motor (8) to continue stirring at a second speed, wherein the second time is longer than the first time and the second speed is greater than the first speed. Real-time acquisition of the redox value of the ORP sensor (12), calculation of the ratio of the redox value to the preset second threshold as the redox ratio, adjustment of the first flow rate according to the negative correlation of the redox ratio, and adjustment of the second speed according to the negative correlation of the redox ratio. Step S4: Control the stirring motor (8) and the aeration blower (1) to stop simultaneously for a third duration, wherein the third duration is not less than the first duration; Step S5: Control the water outlet module (9) to discharge water from the sewage treatment tank; Step S6: Repeat steps S1 to S5.

2. The integrated A / O alternating wastewater treatment method based on time-series coupling according to claim 1, characterized in that, The method also includes the following steps: Dissolved oxygen values ​​are obtained and saved to the dissolved oxygen sequence in the preset first period. The dissolved oxygen sequence is smoothed according to the preset first window to obtain the dissolved oxygen calculation component. The latest dissolved oxygen sensing component is obtained through the DO sensor (11). The dissolved oxygen sensing component and the dissolved oxygen calculation component are weighted and averaged to calculate the dissolved oxygen value. Calculate the fluctuation value of dissolved oxygen in the first window, take the absolute value of the fluctuation value as the absolute value of the fluctuation, and calculate the ratio of the absolute value of the fluctuation to the preset fluctuation reference value as the fluctuation ratio. If the absolute value of the fluctuation is less than the reference value of the fluctuation, the weight corresponding to the next weighted average calculation of the dissolved oxygen calculation component is adjusted according to the negative correlation of the fluctuation ratio; otherwise, an alarm control component is applied to the stirring motor (8), and the period of the alarm control component is adjusted according to the negative correlation of the fluctuation ratio.

3. The integrated A / O alternating wastewater treatment method based on time-series coupling according to claim 2, characterized in that, The method also includes the following steps: Obtain the dissolved oxygen sequence corresponding to step S2 in multiple batches of wastewater treatment; Dissolved oxygen curves fitted based on the dissolved oxygen sequence of each batch; Calculate the duration of the dissolved oxygen curve decrease, and calculate the trend value of the decrease duration based on the decrease duration corresponding to multiple batches; The ratio of the downward trend value to the preset downward reference value is the downward ratio. The first duration is adjusted according to the positive correlation of the downward ratio.

4. The integrated A / O alternating wastewater treatment method based on time-series coupling according to claim 3, characterized in that, The method also includes the following steps: When adjusting the first rotation speed according to the positive correlation of the dissolved oxygen ratio, the adjustable range of the first rotation speed is the first adjustable range. The adjustment step size of the first rotational speed and the range of the first adjustable range are adjusted based on the negative correlation between the ratio of descent time and the ratio of descent time.

5. The integrated A / O alternating wastewater treatment method based on time-series coupling according to claim 1, characterized in that, The method also includes the following steps: The redox value is obtained and saved to the redox sequence in the preset second period. The latest redox sensing component is obtained through the ORP sensor (12). The redox value is obtained by window weighted average calculation of the redox sequence based on the preset second window. The newer the acquisition time of the redox sensing component, the greater the weight. Calculate the average redox value in the second window, and calculate the ratio of the average value to the preset average reference value as the average ratio; If the average value is greater than the preset average reference value, the weight of the next window weighted average of the latest redox sensing component is calculated according to the positive correlation of the average ratio; otherwise, an alarm control component is applied to the aeration blower (1), and the period of the alarm control component is adjusted according to the positive correlation of the average ratio.

6. The integrated A / O alternating wastewater treatment method based on time-series coupling according to claim 5, characterized in that, The method also includes the following steps: Obtain the redox sequences corresponding to step S3 of wastewater treatment in multiple batches; The redox curves were fitted based on the redox sequences of each batch; Calculate the rise time of the redox curve, and calculate the rise time trend value based on the rise time corresponding to multiple batches; The ratio of the rising duration trend value to the preset rising duration reference value is calculated as the rising duration ratio. The second duration is adjusted according to the positive correlation of the rising duration ratio.

7. The integrated A / O alternating wastewater treatment method based on time-series coupling according to claim 6, characterized in that, The method also includes the following steps: When adjusting the first flow rate based on the negative correlation of the redox ratio, the adjustable range of the first flow rate is the second adjustable range; The adjustment step size of the first flow rate and the range of the second adjustable range are adjusted based on the positive correlation between the rise time ratio and the rise time ratio.

8. The integrated A / O alternating wastewater treatment method based on time-series coupling according to any one of claims 1-7, characterized in that, The method also includes the following steps: The timing of the nutrient source addition module (13) is obtained after the addition is completed; The real-time speed is obtained by superimposing the first speed of the stirring motor (8) with the temporary speed. The control module (14) controls the stirring motor (8) according to the real-time speed. The temporary speed is set to be negatively correlated with the release time. If the deployment time exceeds the preset reference time, the temporary rotation speed is set to zero, where the reference time is less than the first duration.

9. An integrated A / O alternating wastewater treatment system based on time-series coupling, characterized in that, Includes a processor, wherein the steps of the integrated A / O alternating wastewater treatment method based on time coupling as described in any one of claims 1-8 are executed.

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