A sewage treatment system, method and storage medium

Abstract

The application discloses a sewage treatment system and method and a storage medium. The application keeps air supply of a lower MABR reaction zone during a water inlet stage and a water decanting stage, and controls at least three reaction zones to operate according to staggered peak scheduling timing, so that different reaction zones are respectively in the water inlet stage, the reaction stage or the water decanting stage at the same time, thereby ensuring sufficient biochemical reaction in the water inlet stage and the water decanting stage, and enabling the sewage treatment system to have stable treatment capacity of continuous water inlet and continuous water outlet.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and more specifically, to a wastewater treatment system, method, and storage medium. Background Technology

[0002] The Sequencing Batch Reactor (SBR) is a wastewater treatment process that completes the influent, reaction, sedimentation, and effluent in a time-sequential manner within the same reaction tank. This process is characterized by its relatively simple flow, fewer structures, and flexible operation, and has been widely used for the treatment of domestic sewage and similar low-concentration organic wastewater.

[0003] A membrane-aerated biofilm reactor (MABR) can supply oxygen to the biofilm through membrane modules, creating an oxygen concentration gradient within the biofilm, which is beneficial for the degradation of organic matter and simultaneous nitrification and denitrification reactions. This technology has advantages such as high oxygen supply efficiency, minimal aeration disturbance, and suitability for continuous reactions with low disturbance.

[0004] Currently, simply placing MABR components within a sequencing batch reactor (SBR) or operating multiple reactors in parallel does not create a layered, coordinated operation within the same reaction zone, characterized by a continuous MABR reaction zone at the bottom and a static decanting zone at the top. Furthermore, it fails to establish a sequential control logic for gas supply, mixing, and decanting that matches the influent, reaction, and decanting stages. Existing technologies still struggle to maintain biochemical reactions while minimizing decanting disturbance, and also fail to ensure sufficient reaction during the influent and decanting stages, as well as stable operation with continuous influent and effluent at the system level.

[0005] The above content is only used to help understand the technical solution of the present invention and does not represent an admission that the above content is prior art. Summary of the Invention

[0006] The main objective of this invention is to provide a wastewater treatment system, method, and storage medium to solve the problems of difficulty in maintaining biochemical reactions while reducing decanting disturbance, and difficulty in ensuring sufficient reactions during the influent and decanting stages, as well as the stable operation of continuous influent and continuous effluent at the system level.

[0007] To achieve the above objectives, the present invention provides a wastewater treatment system, the wastewater treatment system comprising: At least three reaction zones, each of which includes a lower membrane aerated biofilm reaction zone and a mixed liquid zone located above the lower membrane aerated biofilm reaction zone, wherein a membrane aeration component is provided in the lower membrane aerated biofilm reaction zone; The water inlet unit includes a main water inlet pipe and at least three branch water inlet pipes. The sewage enters through the main water inlet pipe. One end of each branch water inlet pipe is connected to the main water inlet pipe, and the other end of each branch water inlet pipe is connected to the corresponding reaction zone. The sewage can enter the corresponding reaction zone through the branch water inlet pipes. The air supply unit is connected to the membrane aeration assembly via an aeration pipe; A mixing unit is disposed within the mixing liquid zone and is used to mix the liquids within the mixing liquid zone; A decanting unit is located above the mixing zone and is used to discharge the upper clear liquid. The water outlet unit includes a main water outlet pipe, which is connected to the decanting unit, and the upper clear liquid is discharged through the main water outlet pipe; The control unit is electrically connected to the water inlet unit, the air supply unit, the mixing unit, and the decanting unit, respectively. The control unit is configured to control at least three of the reaction zones to be in the water inlet stage, the reaction stage, or the decanting stage at the same time according to the staggered scheduling sequence. In the water inlet stage, the control unit controls the sewage to enter the reaction zone, maintains the air supply to the lower membrane aerated biofilm reaction zone, and starts the mixing unit in the mixed liquid zone after a delay after the water inlet begins. In the reaction stage, the control unit maintains the air supply to the lower membrane aerated biofilm reaction zone and operates the mixing unit. In the decanting stage, the control unit stops the operation of the mixing unit, controls the decanting unit to discharge the upper clear liquid, and maintains the air supply to the lower membrane aerated biofilm reaction zone.

[0008] Furthermore, the wastewater treatment system also includes an online monitoring unit configured to collect operational status data for each reaction zone, wherein the operational status data includes at least one of liquid level, water quality parameters, cumulative influent volume, cumulative decanting volume, actuator status, and sensor validity indicators; The control unit includes a stage identification unit, which is configured to control the reaction zone to switch between the water intake stage, the reaction stage, and the decanting stage based on the operating status data and preset stage switching conditions. The stage switching conditions include time conditions and status conditions.

[0009] Furthermore, the online monitoring unit is also configured to detect whether a malfunction has occurred in any reaction zone; The wastewater treatment system also includes: The feedback correction unit is configured to recalculate the peak-shifting scheduling sequence if the online monitoring unit detects a fault in any reaction zone. The exception tracing unit is configured to generate exception event records; The data storage unit is configured to store the operating status data and the abnormal event records.

[0010] Furthermore, the state conditions for switching from the water intake stage to the reaction stage include: the cumulative water intake of the reaction zone reaches a preset water intake, or the liquid level of the reaction zone reaches a first preset liquid level threshold. The state conditions for switching from the reaction stage to the decanting stage include: the ammonia nitrogen concentration in the reaction zone is lower than a preset ammonia nitrogen threshold, or the chemical oxygen demand concentration is lower than a preset concentration threshold; The conditions for the end of the decanting stage include: the liquid level in the reaction zone drops to a second preset liquid level threshold, or the cumulative decanting volume in the reaction zone reaches a preset decanting volume.

[0011] Furthermore, the time delay for starting the mixing unit after the water intake phase begins is 15-20 minutes; and / or, The decanting stage includes a settling sub-stage and a decanting sub-stage. Before entering the decanting stage, the mixing unit stops operating one mixing cycle in advance. The mixing cycle is 8 to 15 minutes, and the settling sub-stage lasts for 10 to 20 minutes.

[0012] Furthermore, the stage identification unit is configured to mark the faulty reaction zone as unsuitable for peak-shifting scheduling when the online monitoring unit detects a fault in any of the reaction zones. The water inlet unit stops the water inlet to the fault reaction zone, or the decanting unit stops the decanting operation; The air supply unit reduces the air supply to the lower membrane aeration biofilm reaction zone of the fault reaction zone to a preset air supply. When the fault is an abnormal air supply, isolation, alarm or backup air supply switching is performed. The feedback correction unit recalculates the staggered scheduling sequence based on the number of reaction zones that are not faulty, the current influent flow rate, the remaining effective volume, and the current operating stage.

[0013] Furthermore, the recalculation of the off-peak scheduling timing includes: Calculate the maximum influent flow rate that the current wastewater treatment system can accept; Obtain the current influent flow rate of the wastewater treatment system and compare the current influent flow rate with the maximum influent flow rate; If the maximum influent flow rate is greater than or equal to the current influent flow rate, then the influent task of the faulty reaction zone is allocated to the unfaulty reaction zone according to the proportion of the acceptance capacity of the unfaulty reaction zone. If the maximum inflow rate is less than the current inflow rate, then at least one of the following operations is performed: reducing the inflow rate, activating the storage unit, or issuing a flow-limiting alarm.

[0014] Furthermore, the feedback correction unit is configured to calculate the maximum influent flow rate that the current wastewater treatment system can accept in the following manner: Obtain the number of non-faulty reaction zones, the remaining effective volume of the non-faulty reaction zones, and the remaining time required for the i-th non-faulty reaction zone to complete the current stage and be ready to receive new water. The maximum influent flow rate is calculated using a first preset formula, which is: Among them, the The number of non-faulty reaction zones. The remaining effective volume of the i-th non-faulty reaction zone, The remaining time required for the i-th non-faulty reaction zone to complete the current phase and be ready to receive new water.

[0015] Furthermore, to achieve the above objectives, the present invention also provides a wastewater treatment method, comprising: During the water intake stage, the wastewater is controlled to enter the reaction zone, the air supply to the lower membrane aerated biofilm reaction zone is maintained, and the mixing unit in the mixed liquid zone is started after a delay after the water intake begins. During the reaction phase, the air supply to the lower membrane aeration biofilm reaction zone is maintained and the mixing unit is operated. During the decanting stage, the mixing unit is stopped, the upper clear liquid is discharged from the decanting unit, and the air supply to the lower membrane aeration biofilm reaction zone is maintained. Specifically, at least three of the reaction zones are controlled to operate in a staggered scheduling sequence, so that different reaction zones are in the water intake stage, the reaction stage, or the decanting stage at the same time.

[0016] In addition, to achieve the above objectives, the present invention also provides a storage medium storing a wastewater treatment program, which, when executed by a processor, implements the steps of the wastewater treatment method as described above.

[0017] This invention maintains the air supply to the lower MABR reaction zone during both the influent and decanting stages, and controls at least three reaction zones to operate according to a staggered scheduling sequence, so that different reaction zones are in the influent, reaction, or decanting stages at the same time. This ensures the full progress of the biochemical reactions during the influent and decanting stages, and enables the wastewater treatment system to have a stable treatment capacity for continuous influent and continuous effluent. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the wastewater treatment system of the present invention; Figure 2This is a schematic diagram of the reaction zone structure in one embodiment of the present invention; Figure 3 This is a schematic diagram illustrating the stages of a wastewater treatment system operating according to a staggered scheduling sequence in one embodiment of the present invention; The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings.

[0019] Explanation of reference numerals in the attached figures 100 - Pretreatment unit; 200 - Main inlet pipe; 210 - Branch inlet pipe; 310 - First reaction zone; 320 - Second reaction zone; 330 - Third reaction zone; 340 - Fourth reaction zone; 311 - Lower MABR reaction zone; 312 - Mixed liquor zone; 700 - Decanting unit; 300 - Filter unit; 301 - Water outlet; 400 - Main water outlet pipe; 500 - Air supply unit; 510 - Aeration pipe; 520 - Membrane aeration assembly; 600 - Mixing unit; 700 - Decanting unit; 800 - Online monitoring unit; 810 - Liquid level sensor; 820 - Dissolved oxygen sensor; 900 - Control unit; 1000 - Stage identification unit; 1100 - Feedback correction unit; 1200 - Anomaly tracing unit; 1300 - Data storage unit. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0021] This invention provides a wastewater treatment system, such as Figure 1As shown, the wastewater treatment system includes an influent unit, at least three reaction zones (this embodiment uses four reaction zones as an example, namely, the first reaction zone 310, the second reaction zone 320, the third reaction zone 330, and the fourth reaction zone 340), an effluent unit, an air supply unit 500, a mixing unit 600, a decanting unit 700, an online monitoring unit 800, a control unit 900, a stage identification unit 1000, a feedback correction unit 1100, an anomaly tracing unit 1200, and a data storage unit 1300. Each reaction zone (taking the first reaction zone 310 as an example) includes a lower MABR reaction zone 311 and a mixed liquor zone 312 located above the lower MABR reaction zone 311. A membrane aeration assembly 313 is installed in the lower MABR reaction zone 311. The inlet unit includes an inlet main pipe 200 and at least three inlet branch pipes 210. Wastewater enters through the inlet main pipe 200. One end of each inlet branch pipe 210 is connected to the inlet main pipe 200, and the other end of each inlet branch pipe 210 is connected to the corresponding reaction zone. Wastewater can enter the corresponding reaction zone through the inlet branch pipes. The air supply unit 500 is connected to the membrane aeration assembly 313 through an aeration pipe 510. The mixing unit 600 is located in the mixed liquid zone 312, and its agitator extends into the mixed liquid zone 312. The decanting unit 700 is located at the top of the mixed liquid zone 312, and the decanter of the decanting unit 700 can move up and down to discharge the upper clear liquid. The control unit 900 is electrically connected to the inlet unit, the air supply unit 500, the mixing unit 600, and the decanting unit 700. The control unit 900 is configured to control the sewage to enter the reaction zone during the inlet stage, maintain the air supply to the lower MABR reaction zone 311, and start the mixing unit 600 in the mixed liquor zone 312 after a delay after the start of inlet, so that the sewage entering the zone will preferentially enter and contact the lower MABR reaction zone 311. During the reaction stage, the control unit 900 maintains the air supply to the lower MABR reaction zone and operates the mixing unit 600. During the decanting stage, the control unit 900 stops operating, controls the decanting unit 700 to discharge the upper clear liquid, and maintains the air supply to the lower MABR reaction zone, so that while the clear liquid is stably discharged from the upper mixed liquor zone, the lower membrane aerated biofilm reaction zone continues to carry out pollutant removal reaction. At least three reaction zones are controlled to operate in a staggered scheduling sequence, so that different reaction zones are in the inlet stage, reaction stage, or decanting stage at the same time.

[0022] This invention maintains aeration supply to the lower MABR reaction zone during both the influent and decanting stages, and controls at least three reaction zones to operate in a staggered scheduling sequence. This ensures that different reaction zones are simultaneously in the influent, reaction, or decanting stages, guaranteeing sufficient biochemical reactions during both stages and enabling the wastewater treatment system to achieve stable continuous influent and effluent treatment capabilities. Furthermore, the lower MABR reaction zone and upper mixed liquor zone are vertically stratified, creating a relatively stable clear liquid layer in the upper layer and maintaining a low-disturbance oxygen supply and continuous reaction environment in the lower layer. This solves the problem of balancing decanting stability with continuous biochemical reaction in the lower layer. Maintaining MABR aeration supply and delaying mixing during the influent stage reduces initial hydraulic disturbance, allowing wastewater to preferentially contact the lower MABR reaction zone, improving treatment stability and avoiding the problems of large disturbances and insufficient contact between pollutants and the lower reaction zone during the initial influent stage. During the decanting stage, mixing is stopped but the MABR gas supply is maintained, so that while the upper layer is stabilized during decanting, the lower MABR reaction zone continues to remove pollutants.

[0023] The wastewater treatment system also includes a pretreatment unit 100, which performs preliminary treatment on the incoming water (such as screening and grit removal). The pretreated wastewater enters the inlet branch pipes 210 through the main inlet pipe 200, and then enters the corresponding reaction zones through each inlet branch pipe 210. The effluent from each reaction zone is discharged through the main outlet pipe 400 and can enter a filtration unit 300 (such as a sand filter or membrane filter) for further treatment before being discharged from the outlet 301 or reused.

[0024] like Figure 2 As shown, the main inlet pipe 200 is connected to each reaction zone via branch pipes equipped with inlet valves. The main outlet pipe 400 is connected to the outlet of each decanting unit 700. The online monitoring unit 800 includes a liquid level sensor 810, a dissolved oxygen sensor 820, an online ammonia nitrogen monitor, an online COD monitor, an inlet flow meter on the inlet pipe, and an outlet flow meter on the outlet pipe, all installed in each reaction zone.

[0025] In this embodiment, the influent stage process is as follows: the influent valve is opened, and wastewater enters the reaction zone from the bottom. The air supply unit 500 continuously supplies air to the membrane aeration assembly 313. The timer starts timing, and after a delay of 15-20 minutes after the influent begins, the mixing unit 600 is started. During this stage, the wastewater in the reaction zone comes into full contact with the MABR reaction zone 311 from bottom to top, and the biofilm in the lower layer of the MABR reaction zone 311 preferentially contacts and degrades pollutants. The delayed start of the mixing unit in the mixed liquor zone reduces influent disturbance.

[0026] In this embodiment, the gas supply unit 500 and the mixing unit 600 operate continuously to carry out efficient biochemical reactions. The control unit 900 monitors the ammonia nitrogen concentration and COD concentration in real time.

[0027] In this embodiment, the decanting stage includes a settling sub-stage and a decanting sub-stage. The mixing unit 600 is stopped, and the settling sub-stage (10-20 minutes) begins. After settling, if the upper clear liquid meets the requirements, the decanting unit 700 is started to drain the water, entering the decanting sub-stage. During this period, the air supply unit 500 continues to supply air to the lower membrane aeration biofilm reaction zone, thus ensuring stable decanting in the upper layer while continued pollutant removal in the lower MABR reaction zone. When the liquid level drops to the target level or the cumulative decanting volume reaches the target cumulative decanting volume, the decanting unit 700 is shut off, ending the decanting stage and completing one full cycle. The water intake stage can then resume.

[0028] Each reaction zone goes through an influent stage, a reaction stage, and a decanting stage to complete a full wastewater treatment process. The control unit 900 can control at least three reaction zones to operate in a staggered scheduling sequence, so that different reaction zones are in the influent stage, the reaction stage, or the decanting stage at the same time.

[0029] like Figure 3 As shown, the four reaction zones 310, 320, 330, and 340 operate in a staggered scheduling sequence. Stage numbers 1-4 distinguish different operating stages: number 1 represents the influent stage, number 2 the reaction stage, number 3 the settling sub-stage, and number 4 the decanting sub-stage. Both the settling and decanting sub-stages are sub-stages of the decanting stage. Observing along the time direction (horizontal), the same reaction zone sequentially experiences the influent stage, reaction stage, settling sub-stage, and decanting sub-stage; observing along the longitudinal direction, different reaction zones are in different stages at the same time. The four reaction zones operate in a staggered scheduling sequence. For example, when the first reaction zone 310 is in the influent stage, the second reaction zone 320 is in the reaction stage, the third reaction zone 330 is in the settling sub-stage, and the fourth reaction zone 340 is in the decanting sub-stage. This staggered timing ensures that the influent main pipe 200 always has a reaction zone receiving wastewater, and the effluent main pipe 400 always has a reaction zone discharging clean water, achieving continuous overall operation. Through this staggered scheduling sequence, at least one reaction zone can receive influent during any given time period, while another reaction zone can carry out the reaction or decanting, thereby achieving continuous influent and continuous effluent for the entire wastewater system.

[0030] Furthermore, in order to ensure stable connection between multiple reaction zones during staggered operation, the stage identification unit 1000 in this invention establishes an independent operating state for each reaction zone, and the stage identification unit 1000 determines the stage switching based on time conditions, state conditions, and abnormal rollback conditions.

[0031] Specifically, the operational status data of each reaction zone is acquired, including at least one of the following: liquid level, water quality parameters, cumulative influent volume, cumulative decanting volume, actuator status, and sensor validity indicators. Based on operational status data and preset stage switching conditions, the control reaction zone switches between the water intake stage, the reaction stage, and the decanting stage. The stage switching conditions include time conditions and status conditions.

[0032] The timing conditions for switching from the water intake stage to the reaction stage include: the duration of the water intake stage exceeds the maximum allowable duration; the state conditions for switching from the water intake stage to the reaction stage include: the cumulative water intake in the reaction zone reaches the preset water intake volume, or the liquid level in the reaction zone reaches the first preset liquid level threshold. If an abnormal backoff condition is triggered, the water intake or decanting action in the current reaction zone will be stopped. These abnormal backoff conditions include sensor failure, actuator feedback anomaly, liquid level exceeding the limit, stage switching timeout, and abnormal air supply. The time conditions for switching from the reaction stage to the decanting stage include: the duration of the reaction stage is greater than the preset duration; the state conditions for switching from the reaction stage to the decanting stage include: the ammonia nitrogen concentration in the reaction zone is lower than the preset ammonia nitrogen threshold, or the chemical oxygen demand concentration is lower than the preset concentration threshold.

[0033] The time conditions for the end of the decanting stage include: the duration of the decanting stage is greater than the set maximum preset duration; the state conditions for the end of the decanting stage include: the liquid level in the reaction zone drops to the second preset liquid level threshold, or the cumulative decanting volume in the reaction zone reaches the preset decanting volume.

[0034] Furthermore, the complete operating cycle of a single reaction zone is determined based on the designed treatment capacity, effective volume of the reaction zone, target pollutant removal rate, oxygen supply capacity of the membrane aeration components, and sludge-water separation conditions. Preferably, the complete operating cycle of a single reaction zone is 4-8 hours. The duration of the influent stage is preferably 45-90 minutes, determined based on the target influent volume per cycle, influent flow rate, and high liquid level threshold. The duration of the reaction stage is preferably 120-240 minutes, determined based on the influent COD, ammonia nitrogen concentration, oxygen supply capacity of the membrane aeration components, biofilm activity, and target effluent quality. The decanting stage includes a settling sub-stage and a decanting sub-stage. The settling sub-stage is preferably 10-20 minutes, used to form a stable clear liquid layer; the decanting sub-stage is preferably 20-55 minutes, determined based on the decanting flow rate, target decanting volume, low liquid level threshold, and upper clear liquid stability.

[0035] In this embodiment, when the water intake stage begins, the control unit 900 controls the air supply unit 500 to continuously supply air to the lower MABR reaction zone 311 of the target reaction zone. After the water intake begins, the mixing unit 600 is started after a delay of 15 to 20 minutes. The aforementioned delayed start-up mixing is not simply a delayed control, but rather a combination of continuous air supply to the lower membrane aeration biofilm reaction zone. This allows pollutants in the initial influent phase to preferentially contact the biofilm and react in the lower MABR zone, reducing the disturbance of the initial influent to the upper mixed liquor zone and subsequent mud-water separation.

[0036] During the reaction phase, the control unit 900 maintains air supply to the lower MABR reaction zone 311 while simultaneously operating the mixing unit 600. Before entering the decanting phase, the control unit 900 stops the mixing unit 600 one mixing cycle (e.g., 8-15 minutes) in advance. After entering the decanting phase, the control unit 900 controls the decanting unit to discharge the upper clear liquid while maintaining air supply to the lower MABR reaction zone 311, thus ensuring the lower zone continues to maintain the reaction environment. Under the above operating conditions, the influent and effluent water quality during the stable operation of the wastewater treatment system in this embodiment is shown in the table below. Two comparative examples are also provided: Comparative Example 1 differs from this embodiment in that it stops MABR air supply during the decanting phase; Comparative Example 2 differs from this embodiment in that it immediately starts the mixing unit at the beginning of the influent phase (without delay). The mixing cycle is located at the end of the reaction stage and is part of the reaction stage. In other words, mixing is stopped prematurely before the reaction stage ends, but the MABR gas supply may continue. The settling sub-stage is located after the end of the reaction stage and before the decanting sub-stage. It is an independent sub-stage and is usually not included in the reaction stage duration.

[0037] The control method for the decanting stage described above differs from the conventional SBR control that stops aeration or only stops mixing. Its core lies in utilizing the low-disturbance characteristics of MABR membrane aeration to create a spatial division of labor in the decanting stage: "static or low-disturbance decanting in the upper layer and continuous oxygen supply reaction in the lower layer."

[0038] As shown in the table above, the average effluent COD concentration in this embodiment was 16.31 mg / L, the average ammonia nitrogen concentration was 0.42 mg / L, the average total nitrogen concentration was 7.21 mg / L, and the average total phosphorus concentration was 0.18 mg / L; the corresponding average removal rates were 89.15%, 98.28%, 75.00%, and 92.01%, respectively. These results indicate that this embodiment can stably achieve efficient removal of organic matter, ammonia nitrogen, total nitrogen, and total phosphorus under continuous influent intermittent operation conditions.

[0039] Compared to Comparative Example 1, this embodiment showed lower average effluent concentrations of COD, ammonia nitrogen, total nitrogen, and total phosphorus. This indicates that stopping mixing during the decanting stage while maintaining MABR aeration ensures stable discharge of the upper clear liquid while maintaining continuous reaction in the lower MABR reaction zone. Compared to Comparative Example 2, this embodiment also showed a lower overall average effluent concentration, indicating that delayed start-up mixing during the influent stage reduces initial influent disturbance, which is beneficial for improving treatment efficiency and operational stability.

[0040] Furthermore, each reaction zone in the wastewater treatment system may encounter malfunctions during operation, thus requiring adjustments to the peak-shifting schedule in case of a malfunction. In this embodiment, when a malfunction is detected in any reaction zone, the stage identification unit 1000 marks the malfunctioning reaction zone as unsuitable for peak-shifting scheduling, stops the influent or decanting operation of the malfunctioning reaction zone, and reduces the air supply to the MABR reaction zone below the malfunctioning reaction zone to a preset minimum air supply. The feedback correction unit 1100 can recalculate the peak-shifting schedule based on the number of unmalfunctioning reaction zones, the current influent flow rate, the remaining effective volume, and the current operating stage, and correct the relevant parameters. Specifically: Calculate the maximum influent flow rate that the current wastewater treatment system can accept, obtain the current influent flow rate of the current wastewater treatment system, and compare the current influent flow rate with the maximum influent flow rate. If the maximum influent flow rate is greater than or equal to the current influent flow rate, then allocate the influent task of the faulty reaction zone to the non-faulty reaction zone according to the proportion of the acceptance capacity of the non-faulty reaction zone; if the maximum influent flow rate is less than the current influent flow rate, then perform at least one of the following operations: reduce the influent flow rate, activate the storage unit, or issue a flow restriction alarm.

[0041] The steps for calculating the maximum influent flow rate that the current wastewater treatment system can accept include: Obtain the number of unfailed reaction zones, the remaining effective volume of the unfailed reaction zones, and the remaining time required for the i-th unfailed reaction zone to complete the current stage and be ready to receive new water. The maximum inflow rate is calculated using the first preset formula, which is: in, The number of non-faulty reaction zones. Let i be the remaining effective volume of the i-th non-faulty reaction zone. The remaining time required for the i-th non-faulty reaction zone to complete the current stage and be ready to receive new water.

[0042] The formula for allocating the water intake task from the faulty reaction zone to the non-faulty reaction zone is as follows: in, This represents the original single-cycle influent volume of the i-th unfaulted reaction zone. This represents the original single-cycle inflow rate of the fault response zone f. The single-cycle influent volume for the updated, fault-free reaction zone.

[0043] Furthermore, this invention also provides anomaly tracing and data storage methods. When sensor failure, actuator feedback anomaly, liquid level exceeding limit, gas supply anomaly, or stage switching timeout occurs, the anomaly tracing unit 1200 generates an anomaly event record. The anomaly event record includes at least the following information: reaction zone number, current stage, anomaly type, anomaly triggering condition, anomaly parameter value, control command, actuator feedback result, and timestamp. The data storage unit 1300 stores the operating data and anomaly event records according to the reaction zone number and time window. Preferably, the data storage unit 1300 partitions or tables according to the "reaction zone number + month timestamp" method to improve the retrieval efficiency of historical operating data and anomaly event records. For example, for the operating data of the first reaction zone in June 2025, the storage table name can be set to "Zone01_202506". In this way, maintenance personnel can quickly locate the historical data and fault records of a specific reaction zone within a specific time period, which is convenient for post-event analysis and system optimization.

[0044] The present invention also provides a wastewater treatment method applied to the above-mentioned wastewater treatment system, the wastewater treatment method comprising: During the influent stage, the wastewater is controlled to enter the reaction zone, the air supply to the lower membrane aerated biofilm reaction zone is maintained, and the mixing unit in the mixed liquor zone is started after a delay after the influent begins. During the reaction phase, the aeration supply to the lower membrane aeration biofilm reaction zone is maintained and the mixing unit is operated. During the decanting stage, the mixing unit is stopped, the upper clear liquid is discharged from the decanting unit, and the air supply to the lower membrane aeration biofilm reaction zone is maintained. Among them, at least three reaction zones are controlled to operate in a staggered scheduling sequence, so that different reaction zones are in the water intake stage, reaction stage or decanting stage at the same time.

[0045] Furthermore, this embodiment also provides a storage medium, characterized in that the storage medium stores a wastewater treatment program, which, when executed by a processor, implements the above-described wastewater treatment method steps.

[0046] The processor and memory can be connected via a bus or other means.

[0047] Memory, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer-executable programs. Furthermore, memory may include high-speed random access memory, and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some embodiments, memory may optionally include memory remotely located relative to the processor, and these remote memories can be connected to the processor via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0048] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or system. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or system that includes that element.

[0049] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0050] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A wastewater treatment system, characterized in that, The wastewater treatment system includes: At least three reaction zones, each of which includes a lower membrane aerated biofilm reaction zone and a mixed liquid zone located above the lower membrane aerated biofilm reaction zone, wherein a membrane aeration component is provided in the lower membrane aerated biofilm reaction zone; The water inlet unit includes a main water inlet pipe and at least three branch water inlet pipes. The sewage enters through the main water inlet pipe. One end of each branch water inlet pipe is connected to the main water inlet pipe, and the other end of each branch water inlet pipe is connected to the corresponding reaction zone. The sewage can enter the corresponding reaction zone through the branch water inlet pipes. The air supply unit is connected to the membrane aeration assembly via an aeration pipe; A mixing unit is disposed within the mixing liquid zone and is used to mix the liquids within the mixing liquid zone; A decanting unit is located above the mixing zone and is used to discharge the upper clear liquid. The water outlet unit includes a main water outlet pipe, which is connected to the decanting unit, and the upper clear liquid is discharged through the main water outlet pipe; The control unit is electrically connected to the water inlet unit, the air supply unit, the mixing unit, and the decanting unit, respectively. The control unit is configured to control at least three of the reaction zones to be in the water inlet stage, the reaction stage, or the decanting stage at the same time according to the staggered scheduling sequence. In the water inlet stage, the control unit controls the sewage to enter the reaction zone, maintains the air supply to the lower membrane aerated biofilm reaction zone, and starts the mixing unit in the mixed liquid zone after a delay after the water inlet begins. In the reaction stage, the control unit maintains the air supply to the lower membrane aerated biofilm reaction zone and operates the mixing unit. In the decanting stage, the control unit stops the operation of the mixing unit, controls the decanting unit to discharge the upper clear liquid, and maintains the air supply to the lower membrane aerated biofilm reaction zone.

2. The wastewater treatment system as described in claim 1, characterized in that, The wastewater treatment system further includes an online monitoring unit configured to collect operational status data for each reaction zone, wherein the operational status data includes at least one of liquid level, water quality parameters, cumulative influent volume, cumulative decanting volume, actuator status, and sensor validity indicators; The control unit includes a stage identification unit, which is configured to control the reaction zone to switch between the water intake stage, the reaction stage, and the decanting stage based on the operating status data and preset stage switching conditions. The stage switching conditions include time conditions and status conditions.

3. The wastewater treatment system as described in claim 2, characterized in that, The online monitoring unit is also configured to detect whether a fault has occurred in any reaction zone; The wastewater treatment system also includes: The feedback correction unit is configured to recalculate the peak-shifting scheduling sequence if the online monitoring unit detects a fault in any reaction zone. The exception tracing unit is configured to generate exception event records; The data storage unit is configured to store the operating status data and the abnormal event records.

4. The wastewater treatment system as described in claim 2, characterized in that, The state conditions for switching from the water intake stage to the reaction stage include: the cumulative water intake of the reaction zone reaches a preset water intake, or the liquid level of the reaction zone reaches a first preset liquid level threshold. The state conditions for switching from the reaction stage to the decanting stage include: the ammonia nitrogen concentration in the reaction zone is lower than a preset ammonia nitrogen threshold, or the chemical oxygen demand concentration is lower than a preset concentration threshold; The conditions for the end of the decanting stage include: the liquid level in the reaction zone drops to a second preset liquid level threshold, or the cumulative decanting volume in the reaction zone reaches a preset decanting volume.

5. The wastewater treatment system according to claim 1, characterized in that, The time delay for starting the mixing unit after the water intake phase begins is 15-20 minutes; and / or, The decanting stage includes a settling sub-stage and a decanting sub-stage. Before entering the decanting stage, the mixing unit stops operating one mixing cycle in advance. The mixing cycle is 8 to 15 minutes, and the settling sub-stage lasts for 10 to 20 minutes.

6. The wastewater treatment system according to claim 3, characterized in that, The stage identification unit is configured to mark the faulty reaction zone as unsuitable for peak-shifting scheduling when the online monitoring unit detects a fault in any of the reaction zones. The water inlet unit stops the water inlet to the fault reaction zone, or the decanting unit stops the decanting operation; The air supply unit reduces the air supply to the lower membrane aeration biofilm reaction zone of the fault reaction zone to a preset air supply. When the fault is an abnormal air supply, isolation, alarm or backup air supply switching is performed. The feedback correction unit recalculates the staggered scheduling sequence based on the number of reaction zones that are not faulty, the current influent flow rate, the remaining effective volume, and the current operating stage.

7. The wastewater treatment system according to claim 6, characterized in that, The recalculation of the off-peak scheduling timing includes: Calculate the maximum influent flow rate that the current wastewater treatment system can accept; Obtain the current influent flow rate of the wastewater treatment system and compare the current influent flow rate with the maximum influent flow rate; If the maximum influent flow rate is greater than or equal to the current influent flow rate, then the influent task of the faulty reaction zone is allocated to the unfaulty reaction zone according to the proportion of the acceptance capacity of the unfaulty reaction zone. If the maximum inflow rate is less than the current inflow rate, then at least one of the following operations is performed: reducing the inflow rate, activating the storage unit, or issuing a flow-limiting alarm.

8. The wastewater treatment system according to claim 7, characterized in that, The feedback correction unit is configured to calculate the maximum influent flow rate that the current wastewater treatment system can accept in the following manner: Obtain the number of non-faulty reaction zones, the remaining effective volume of the non-faulty reaction zones, and the remaining time required for the i-th non-faulty reaction zone to complete the current stage and be ready to receive new water. The maximum influent flow rate is calculated using a first preset formula, which is: Among them, the The number of non-faulty reaction zones. The remaining effective volume of the i-th non-faulty reaction zone, The remaining time required for the i-th non-faulty reaction zone to complete the current phase and be ready to receive new water.

9. A wastewater treatment method, applied to the wastewater treatment system according to any one of claims 1 to 8, characterized in that, The wastewater treatment method includes: During the water intake stage, the wastewater is controlled to enter the reaction zone, the air supply to the lower membrane aerated biofilm reaction zone is maintained, and the mixing unit in the mixed liquid zone is started after a delay after the water intake begins. During the reaction phase, the air supply to the lower membrane aeration biofilm reaction zone is maintained and the mixing unit is operated. During the decanting stage, the mixing unit is stopped, the decanting unit is controlled to discharge the upper clear liquid, and the air supply to the lower membrane aeration biofilm reaction zone is maintained. Specifically, at least three of the reaction zones are controlled to operate in a staggered scheduling sequence, so that different reaction zones are in the water intake stage, the reaction stage, or the decanting stage at the same time.

10. A storage medium, characterized in that, The storage medium stores a wastewater treatment program, which, when executed by a processor, implements the steps of the wastewater treatment method as described in claim 9.

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