Control method, system and terminal for multi-stage purification of wastewater suitable for green factories

Abstract

The present application relates to a control method, system and terminal for multi-stage purification of wastewater suitable for green factories, and belongs to the technical field of factory wastewater treatment. The control method includes: predicting the total predicted discharge of sewage on the day according to the factory's historical sewage discharge data; generating the first expected water inflow of the wastewater multi-stage purification system according to the predicted total discharge; periodically obtaining the actual buffer volume of sewage stored in the flow buffer tank discharged by the factory on the day; judging whether the actual buffer volume exceeds 1 times the first expected water inflow; if so, controlling the sewage in the flow buffer tank to enter the wastewater multi-stage purification system with the first expected water inflow. The present application has the beneficial effect of adapting the treatment capacity of the wastewater multi-stage purification system to the discharge volume of sewage, so as to improve the treatment effect of the wastewater multi-stage purification system on wastewater.

Description

Technical Field

[0001] The present application relates to the technical field of factory wastewater treatment, and in particular to a control method, system and terminal for multi-stage purification of wastewater suitable for green factories. Background Art

[0002] Industrial wastewater treatment is a complex and critical process that aims to remove harmful substances from wastewater and prevent environmental pollution. Wastewater treatment processes generally include the following steps:

[0003] 1. Preprocessing

[0004] Pretreatment is the first step in industrial wastewater treatment. Its main purpose is to remove large solid particles and impurities such as grease in the wastewater. This step usually includes two steps: screen filtration and water quality adjustment. Screen filtration can remove large solid particles in the wastewater to prevent clogging of subsequent treatment equipment. Water quality adjustment is to ensure the stability of the wastewater quality for subsequent treatment.

[0005] 2. Primary Treatment

[0006] Primary treatment mainly removes suspended matter, sediment, grease, etc. in wastewater through physical methods. Commonly used equipment includes grit chamber, primary sedimentation tank, etc. After primary treatment, most of the suspended matter and sediment in the wastewater can be effectively removed.

[0007] 3. Secondary treatment

[0008] Secondary treatment is the core link of industrial wastewater treatment, which mainly uses biological treatment methods to further remove organic matter in wastewater. Common biological treatment methods include activated sludge method and biofilm method. These methods use the metabolism of microorganisms to decompose organic matter in wastewater into harmless substances. After secondary treatment, the water quality of wastewater can be significantly improved.

[0009] 4. Deep processing

[0010] Deep treatment is to further remove refractory organic matter, nutrients such as nitrogen and phosphorus, and harmful substances such as heavy metals in wastewater. Common deep treatment methods include filtration, adsorption, ion exchange, etc. Through these methods, the treatment effect of wastewater can be further improved to meet the discharge standard or reuse standard.

[0011] In the related art, the treatment of factory wastewater is generally carried out directly by the wastewater multi-stage purification system composed of the above-mentioned treatment process as the wastewater is discharged; however, when the factory wastewater discharge is unstable, for example, a large amount of wastewater is suddenly discharged in a certain period of time, it will directly impact the multi-stage wastewater purification system, causing the system's processing capacity to be unable to adapt to the current wastewater discharge volume, thereby affecting the wastewater treatment effect. Summary of the invention

[0012] In order to adapt the treatment capacity of the multi-stage wastewater purification system to the discharge volume of sewage and improve the treatment effect of the multi-stage wastewater purification system on wastewater, the present application provides a control method, system and terminal for multi-stage wastewater purification suitable for green factories.

[0013] In the first aspect, the present application provides a control method for multi-stage purification of wastewater suitable for green factories, which adopts the following technical scheme:

[0014] A control method for multi-stage purification of wastewater suitable for green factories, comprising:

[0015] Based on the historical sewage discharge data of the factory, the total amount of sewage discharged on that day is predicted;

[0016] generating a first expected water inflow of the wastewater multi-stage purification system according to the predicted total discharge amount;

[0017] Periodically obtain the actual buffer volume of sewage discharged by the factory to the flow buffer tank on the day;

[0018] Determining whether the actual buffer volume exceeds 1 times the first expected water inflow volume;

[0019] If yes, controlling the sewage in the flow buffer tank to enter the wastewater multi-stage purification system at the first expected water inflow;

[0020] If not, the flow buffer tank continues to store sewage.

[0021] By adopting the above technical solution, the total discharge volume of the day is predicted based on historical sewage discharge data, and then a suitable first expected water inflow is generated, so that the water inflow of the wastewater multi-stage purification system can be reasonably planned in advance. When the actual buffer volume exceeds 1 times the first expected water inflow, it is controlled to enter the purification system according to the first expected water inflow, which can effectively prevent the purification system from receiving too much sewage in a short period of time and overloading, and ensure that each treatment unit in the system can operate stably according to normal process parameters and processes, maintain high treatment efficiency and good effluent water quality. By setting the expected water inflow based on the prediction of historical data, combined with the control of the actual buffer volume, the amount of sewage entering the purification system is as compatible as possible with the system's processing capacity, avoiding idle waste of processing capacity or the problem that some sewage cannot be treated in a timely and effective manner due to the sewage volume far exceeding the processing capacity, achieving a better balance between sewage volume and processing capacity, and improving the scientificity and rationality of sewage disposal. Since the actual situation of factory sewage discharge often has certain fluctuations, by real-time monitoring of the actual buffer volume in the buffer tank and controlling the water inflow according to the comparison with the expected water inflow, it can flexibly respond to such fluctuations. Even during the peak period of sewage discharge, it can reasonably arrange the rhythm of sewage entering the purification system, ensure the orderly development of the entire sewage purification process, and improve the adaptability to different discharge situations. Since the system operates stably and can effectively treat sewage, it can prevent the overflow and leakage of sewage that has not been properly treated, thereby reducing the risk of sewage pollution to surrounding soil, water bodies and other environmental elements, and better protecting the ecological environment around the factory.

[0022] Optionally, the step of generating a first expected water inflow of the wastewater multi-stage purification system according to the predicted total discharge volume includes:

[0023] Searching a historical sewage discharge database for a target historical discharge total that is similar to the predicted discharge total;

[0024] If found, then retrieve the target historical water inflow volume set of the wastewater multi-stage purification system associated with the target historical total discharge volume, and use the first water inflow volume in the target historical water inflow volume set as the first expected water inflow volume;

[0025] If not found, then obtain m similar historical water inflows, and obtain the average value of the first water inflow of the historical water inflow set corresponding to the m historical water inflows, and use the average value as the first expected water inflow.

[0026] By adopting the above technical solution, by searching the target historical discharge volume similar to the predicted discharge volume from the historical sewage discharge database, this method of determining the water intake by referring to similar discharge situations in the past makes full use of the rules contained in the existing actual operation data; because similar discharge volumes often mean facing similar treatment requirements and working conditions, the first water intake volume in the target historical water intake volume set associated with it is used as the first expected water intake volume, which can make the set water intake volume more in line with the actual treatment requirements, improve the fit between the expected water intake volume and the actual situation, and reduce the unreasonable system operation problems caused by blindly setting the water intake volume. When a completely similar target historical discharge volume is not found, m similar historical water intake volumes are selected, and the average value of the first water intake volume of the corresponding historical water intake volume set is calculated as the first expected water intake volume, so as to comprehensively consider a variety of similar but not completely the same past situations, avoid the deviation caused by the limitations of a single data, and smooth the differences between different situations to a certain extent by taking the average value, so that the first expected water intake volume finally determined can be more representative and more adaptable to the more reasonable water intake volume requirements under different discharge volumes. Since the factory's production activities and sewage discharge conditions may change over time, various new total emission conditions may appear in different periods. Therefore, whether it is directly matching the water intake based on similar historical total emissions, or determining the average water intake by integrating multiple similar situations when a complete match is not found, it can flexibly respond to a variety of sewage discharge total scenarios, so that the multi-stage wastewater purification system has a more appropriate expected water intake reference when facing different water intake scales, enhancing the system's ability to adapt to the complex and changeable actual production emission conditions of the factory.

[0027] Optionally, the control method further comprises:

[0028] Before the next water intake, obtaining current water quality data of the purified water discharged from the wastewater multi-stage purification system;

[0029] Comparing the current water quality data with the previous water quality data;

[0030] If the water quality changes greatly before and after, a second expected water inflow is generated, and the second expected water inflow is smaller than the first expected water inflow;

[0031] The sewage in the flow buffer tank is controlled to enter the wastewater multi-stage purification system at the second expected water inflow, and a first reminder message for cleaning the wastewater multi-stage purification system is sent.

[0032] By adopting the above technical solution, by obtaining the water quality data of the purified water after each water inflow and comparing the current water quality data with the previous one, the treatment effect of the wastewater multi-stage purification system can be grasped in real time. On the one hand, once it is found that the water quality changes before and after are relatively large, it means that the system's treatment process may have an abnormal situation. At this time, a second expected water inflow that is less than the first expected water inflow is generated in time, and the sewage is controlled to enter the system according to this flow rate, which can avoid too much sewage from continuing to enter the treatment system that may be in an abnormal state, and prevent the effluent water quality from further deteriorating due to excessive water inflow, which helps the system gradually restore its normal treatment capacity and ensure that the effluent water quality can stably meet the corresponding standards. On the other hand, in actual operation, the purified water quality may fluctuate greatly due to a variety of reasons such as sudden changes in the influent water quality and sudden equipment failures; the mechanism of adjusting the water inflow according to the water quality comparison can quickly respond to such emergencies, reduce the water inflow in time, and leave time for the system to adjust and recover, thereby enhancing the ability to respond to emergencies such as water quality fluctuations and reducing the risk of effluent water quality exceeding the standard. On the other hand, large changes in water quality often indicate that there may be problems such as filter material blockage, imbalance of microbial community (for biological treatment process) and other problems inside the system. Therefore, it is necessary to generate the second expected water inflow in time and control the water inflow, and send the first reminder information of the cleaning system at the same time, so as to remind the staff to take measures when the problem first appears, so as to avoid the fault from further expanding with the continuous influx of large amounts of sewage.

[0033] Optionally, the step of predicting the total amount of sewage discharged on the day based on the factory's historical sewage discharge data includes:

[0034] Retrieve the historical sewage discharge data of the previous N days from the historical sewage discharge database;

[0035] Associate a weight for each retrieved historical sewage discharge data, the sum of N weights is 1, and the closer to the current day, the greater the weight;

[0036] N historical sewage discharge data and N weights are input into the pre-built sewage discharge prediction model to obtain the predicted total discharge.

[0037] By adopting the above technical solution, a weight is associated with each historical sewage discharge data retrieved, and the closer to the current day, the greater the weight. This setting fully considers the changing characteristics of sewage discharge in the time series. Under normal circumstances, the recent production and operation status and process flow of the factory are more similar to the current situation, and have a greater impact on the total sewage discharge on the day. By giving higher weights to the data of recent days, the prediction model can focus on more timely and relevant data, so that the prediction results are more in line with the actual sewage discharge situation that is about to occur, and effectively improve the accuracy of the prediction. In addition, since different production processes, equipment operating conditions and other working conditions will affect sewage discharge, the prediction method based on the multi-day weighted data can capture the different performances of sewage discharge under various working conditions. For example, the sewage discharge characteristics corresponding to special working conditions such as equipment maintenance and new process trial operation can be reflected in the historical data and included in the prediction considerations, thereby enhancing the adaptability of the prediction of the total sewage discharge under different working conditions.

[0038] Optionally, the control method further comprises:

[0039] After the current expected water inflow is lower than the water inflow threshold, if the current water quality changes greatly compared with the previous water quality, the offset value between the two is obtained;

[0040] Determine the treatment level of the wastewater multi-stage purification system according to the offset value, the larger the offset value is, the higher the treatment level is, and the stronger the treatment capacity of the wastewater multi-stage purification system is;

[0041] According to the treatment level, the wastewater multi-stage purification system is adjusted and a second reminder message is sent.

[0042] By adopting the above technical solution, when the expected water inflow is lower than the water inflow threshold and the water quality changes greatly, the treatment level is determined by obtaining the offset value of the two, and a refined response can be made according to the specific degree of water quality change. Different offset values ​​correspond to different treatment levels, which means that the treatment capacity of the wastewater multi-stage purification system can be adjusted more specifically to match the current water quality conditions, so as to treat the sewage more accurately, effectively curb the trend of further deterioration of water quality, and ensure that the effluent water quality is as stable as possible within the qualified standard range. The influent water quality of factory sewage and various factors in the treatment process may cause water quality fluctuations. This method of dynamically determining the treatment level and adjusting the system based on the offset value can respond flexibly according to the actual changes in water quality in real time. Whether the water quality is getting better or worse, the treatment capacity of the wastewater multi-stage purification system can be quickly adjusted, which enhances the system's adaptability to dynamic changes in water quality and reduces the risk of substandard effluent water quality due to water quality fluctuations.

[0043] Optionally, the control method further comprises:

[0044] Obtaining the current liquid level of the flow buffer pool;

[0045] According to the current liquid level, obtaining the flow volume of the sewage in the flow buffer tank;

[0046] According to the flow volume, obtaining a volume change rate;

[0047] Obtaining the required water inflow flow rate of the flow buffer tank according to the volume change rate and the current expected water inflow flow rate;

[0048] According to the required water flow rate, the valve opening of the drainage valve of the sewage discharge pipeline is adjusted.

[0049] By adopting the above technical solution, the dynamic changes of the amount of sewage in the flow buffer tank can be understood in real time and accurately. Based on these accurate data information, combined with the current expected water inflow, the water inflow should be calculated, so that there is a reliable basis for controlling the sewage flow entering the flow buffer tank, avoiding blind water inflow, and achieving very precise control of the water inflow flow, ensuring that the amount of sewage in the flow buffer tank is maintained within a reasonable range. Regardless of whether the sewage discharge increases or decreases, the water inflow flow can be adjusted in time so that the liquid level and sewage volume of the flow buffer tank can always match the expected water inflow, ensuring that the subsequent wastewater multi-stage purification system has stable and suitable water inflow conditions.

[0050] Optionally, the step of obtaining the required water inflow flow rate of the flow buffer tank according to the volume change rate and the current expected water inflow flow rate includes:

[0051] The volume change rate and the current expected water inflow are input into a pre-built flow model to obtain the expected water inflow; the flow model is =k + +A ;in is the inlet flow rate, k is a constant related to the flow buffer tank characteristics, h is the current liquid level, is the current expected water inflow, A is the cross-sectional area of ​​the flow buffer tank, and A is the volume change rate.

[0052] In the second aspect, the present application provides a control system for multi-stage purification of wastewater suitable for green factories, which adopts the following technical solutions:

[0053] A control system for multi-stage purification of wastewater suitable for green factories, comprising:

[0054] The prediction module is used to predict the total amount of sewage discharge on the day based on the historical sewage discharge data of the factory;

[0055] An expected water inflow generation module, used to generate a first expected water inflow of the wastewater multi-stage purification system according to the predicted total discharge amount;

[0056] A data acquisition module is used to periodically obtain the actual buffer volume of sewage discharged by the factory to the flow buffer tank on the same day;

[0057] A judging module, used for judging whether the actual buffer volume exceeds 1 times the first expected water inflow volume;

[0058] The control module is used to control the sewage in the flow buffer tank to enter the wastewater multi-stage purification system at a first expected water inflow when the judgment module judges that it is yes.

[0059] By adopting the above technical solution, the total discharge volume of the day is predicted based on historical sewage discharge data, and then a suitable first expected water inflow is generated, so that the water inflow of the wastewater multi-stage purification system can be reasonably planned in advance. When the actual buffer volume exceeds 1 times the first expected water inflow, it is controlled to enter the purification system according to the first expected water inflow, which can effectively prevent the purification system from receiving too much sewage in a short period of time and overloading, and ensure that each treatment unit in the system can operate stably according to normal process parameters and processes, maintain high treatment efficiency and good effluent water quality. By setting the expected water inflow based on the prediction of historical data, combined with the control of the actual buffer volume, the amount of sewage entering the purification system is as compatible as possible with the system's processing capacity, avoiding idle waste of processing capacity or the problem that some sewage cannot be treated in a timely and effective manner due to the sewage volume far exceeding the processing capacity, achieving a better balance between sewage volume and processing capacity, and improving the scientificity and rationality of sewage disposal. Since the actual situation of factory sewage discharge often has certain fluctuations, by real-time monitoring of the actual buffer volume in the buffer tank and controlling the water inflow according to the comparison with the expected water inflow, it can flexibly respond to such fluctuations. Even during the peak period of sewage discharge, it can reasonably arrange the rhythm of sewage entering the purification system, ensure the orderly development of the entire sewage purification process, and improve the adaptability to different discharge situations. Since the system operates stably and can effectively treat sewage, it can prevent the overflow and leakage of sewage that has not been properly treated, thereby reducing the risk of sewage pollution to surrounding soil, water bodies and other environmental elements, and better protecting the ecological environment around the factory.

[0060] In a third aspect, the present application provides a terminal, which adopts the following technical solution:

[0061] A terminal, comprising:

[0062] A memory storing a control program for multi-stage purification of wastewater suitable for a green factory;

[0063] The processor is used to execute the program stored in the memory to implement the steps of the above-mentioned control method for multi-stage purification of wastewater applicable to green factories.

[0064] In summary, the present application has at least the following beneficial effects:

[0065] 1. Predict the total amount of sewage discharged on the day, generate the first expected water inflow, and then periodically obtain the actual buffer volume of sewage discharged by the factory to the flow buffer tank on the day, and judge whether the actual buffer volume exceeds 1 times the first expected water inflow. The purpose is to reasonably plan the water inflow of the wastewater multi-stage purification system in advance. When the actual buffer volume exceeds 1 times the first expected water inflow, it is controlled to enter the purification system according to the first expected water inflow, which can effectively prevent the purification system from receiving too much sewage in a short period of time and overloading, and ensure that each treatment unit in the system can operate stably according to normal process parameters and processes, maintain high treatment efficiency and good effluent water quality. By setting the expected water inflow based on the prediction of historical data, combined with the control of the actual buffer volume, the amount of sewage entering the purification system is as compatible as possible with the system's processing capacity, avoiding the idle waste of processing capacity or the problem that some sewage cannot be treated in time and effectively due to the sewage volume far exceeding the processing capacity, achieving a better balance between sewage volume and processing capacity, and improving the scientificity and rationality of sewage disposal. Since the actual situation of factory sewage discharge often has certain fluctuations, by real-time monitoring of the actual buffer volume in the buffer tank and controlling the water inflow according to the comparison with the expected water inflow, it can flexibly respond to such fluctuations. Even during the peak period of sewage discharge, it can reasonably arrange the rhythm of sewage entering the purification system, ensure the orderly development of the entire sewage purification process, and improve the adaptability to different discharge situations. Since the system operates stably and can effectively treat sewage, it can prevent the overflow and leakage of sewage that has not been properly treated, thereby reducing the risk of sewage pollution to surrounding soil, water bodies and other environmental elements, and better protecting the ecological environment around the factory.

[0066] 2. Obtain the water quality data of the purified water discharged by the wastewater multi-stage purification system after each water inflow, and compare the current water quality data with the current water quality data in order to grasp the treatment effect of the wastewater multi-stage purification system in real time. On the one hand, once it is found that the water quality changes greatly before and after, it means that the system's treatment process may have abnormal conditions. At this time, a second expected water inflow that is less than the first expected water inflow is generated in time, and the sewage is controlled to enter the system at this flow rate, which can avoid too much sewage from continuing to enter the treatment system that may be in an abnormal state, and prevent the effluent water quality from further deteriorating due to excessive water inflow, which helps the system gradually restore its normal treatment capacity and ensure that the effluent water quality can stably meet the corresponding standards. On the other hand, in actual operation, the purified water quality may fluctuate greatly due to a variety of reasons such as sudden changes in the influent water quality and sudden equipment failures; the mechanism of adjusting the water inflow according to the water quality comparison can quickly respond to such emergencies, reduce the water inflow in time, and leave time for the system to adjust and recover, thereby enhancing the ability to respond to emergencies such as water quality fluctuations and reducing the risk of effluent water quality exceeding the standard. On the other hand, large changes in water quality often indicate that there may be problems such as filter material blockage, imbalance of microbial community (for biological treatment process) and other problems inside the system. Therefore, it is necessary to generate the second expected water inflow in time and control the water inflow, and send the first reminder information of the cleaning system at the same time, so as to remind the staff to take measures when the problem first appears, so as to avoid the fault from further expanding with the continuous influx of large amounts of sewage.

[0067] 3. Obtain the current liquid level of the flow buffer tank, and according to the current liquid level, obtain the flow volume of the sewage in the flow buffer tank, and then obtain the volume change rate according to the flow volume, and then obtain the required inflow flow of the flow buffer tank according to the volume change rate and the current expected water inflow. The purpose is to understand the dynamic changes of the amount of sewage in the flow buffer tank in real time and accurately. Based on these accurate data information, combined with the current expected water inflow, the required inflow flow is calculated, so that there is a reliable basis for controlling the sewage flow entering the flow buffer tank, avoiding blind water inflow, and achieving very precise control of the inflow flow, ensuring that the amount of sewage in the flow buffer tank is maintained within a reasonable range. Regardless of whether the sewage discharge increases or decreases, the inflow flow can be adjusted in time so that the liquid level and sewage volume of the flow buffer tank can always match the expected water inflow, ensuring that the subsequent wastewater multi-stage purification system has stable and suitable inflow conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0068] Figure 1 It is a flowchart of an implementation method of Example 1 of the present application;

[0069] Figure 2 It is a flowchart of another implementation method of the method embodiment of the present application;

[0070] Figure 3It is a flowchart of another implementation method of the present application method embodiment;

[0071] Figure 4 It is a structural block diagram of an embodiment of the system of the present application.

[0072] Explanation of reference numerals: 101, prediction module; 102, expected water inlet generation module; 103, data acquisition module; 104, judgment module; 105, control module. DETAILED DESCRIPTION

[0073] To make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the following will be combined with the appended drawings of the embodiments of the present invention. Figure 1 -Attached Figure 4 , the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0074] The first embodiment of the present application discloses a control method for multi-stage purification of wastewater suitable for green factories. Figure 1 As an implementation of the control method, the control method may include S110-S160:

[0075] S110, predicting the total amount of sewage discharged on the day based on the historical sewage discharge data of the factory;

[0076] S120, generating a first expected water inflow of the wastewater multi-stage purification system according to the predicted total discharge volume;

[0077] S130, periodically obtaining the actual buffer volume of sewage discharged by the factory to the flow buffer tank on the day;

[0078] S140, determining whether the actual buffer volume exceeds 1 times the first expected water inflow volume;

[0079] S150, if yes, then control the sewage in the flow buffer tank to enter the wastewater multi-stage purification system at a first expected water inflow;

[0080] S160, if not, the flow buffer tank continues to store sewage.

[0081] Specifically, the historical sewage discharge data of the previous N days can be retrieved from the historical sewage discharge database, where N is a set value that can be modified; the historical sewage discharge database can be updated in real time according to the sewage treatment data of the day. For example, retrieve the historical sewage discharge data of the previous 5 days, and then associate a weight with each retrieved historical sewage discharge data. The sum of the 5 weights is 1, and the closer to the current time, the greater the weight. Then input the 5 historical sewage discharge data and the 5 weights into the pre-built sewage discharge prediction model to obtain the predicted total discharge. The sewage discharge prediction model is y= + + ; where y is the total predicted emission, is the weight corresponding to the total amount of sewage discharge on each day, is the total amount of sewage discharged on each day.

[0082] For example, to predict the total amount of sewage discharge on the sixth day, take the historical data of the previous five days as an example: assuming that the total amount of sewage discharge on the first day is 50 cubic meters, the corresponding weight is 0.1, the total amount of sewage discharge on the second day is 55 cubic meters, the corresponding weight is 0.15, the total amount of sewage discharge on the third day is 48 cubic meters, the corresponding weight is 0.2, the total amount of sewage discharge on the fourth day is 52 cubic meters, the corresponding weight is 0.25, the total amount of sewage discharge on the fifth day is 56 cubic meters, the corresponding weight is 0.3; then the total amount of sewage discharge on that day (the sixth day) is y=0.1X50+0.15x55+0.2X48+0.25x52+0.3X56=54.33 cubic meters.

[0083] After obtaining the predicted total discharge amount for the day, a target historical total discharge amount similar to the predicted total discharge amount is searched from the historical sewage discharge database; the similarity is characterized in that the absolute value of the difference between the predicted total discharge amount and the historical total discharge amount is less than a first threshold.

[0084] If found, the target historical water inflow set of the wastewater multi-stage purification system associated with the target historical total discharge volume is retrieved, and the first water inflow in the target historical water inflow set is used as the first expected water inflow. The historical water inflow set represents the water inflow entering the wastewater multi-stage purification system in each time period; for example, the water inflow from 8:00 to 9:00, the water inflow from 9:00 to 10:00, etc. at a time interval of 1 hour.

[0085] If not found, then obtain m similar historical water inflows, and obtain the average of the first water inflows of the historical water inflow set corresponding to the m historical water inflows, and use the average as the first expected water inflow. Similarity indicates that the absolute value of the difference between the predicted total discharge and the historical total discharge exceeds the first threshold but is less than the second threshold. For example, if m is 3, then the average of the first water inflows in the historical water inflow set corresponding to the three historical water inflows is obtained.

[0086] After the first expected water inflow is generated, the actual buffer volume of sewage in the flow buffer tank is periodically obtained, for example, once every hour. The flow buffer tank is equipped with a liquid level sensor, a flow meter and other sensor devices.

[0087] Only when the actual buffer volume exceeds 1 times the first expected water inflow volume, can the multi-stage wastewater purification system be started, and the sewage in the flow buffer tank is discharged into the multi-stage wastewater purification system at the first expected water inflow volume.

[0088] Reference Figure 2 Furthermore, the control method may further include S210-S240:

[0089] S210, before the next water intake, obtaining current water quality data of purified water discharged from the wastewater multi-stage purification system;

[0090] S220, comparing the current water quality data with the previous water quality data;

[0091] S230, if the water quality changes greatly before and after, a second expected water inflow is generated, and the second expected water inflow is smaller than the first expected water inflow;

[0092] S240, controlling the sewage in the flow buffer tank to enter the wastewater multi-stage purification system at a second expected water inflow, and sending a first reminder message for cleaning the wastewater multi-stage purification system.

[0093] Specifically, before the next flow buffer tank discharges sewage to the wastewater multi-stage purification system, the water quality data of the clean water discharged by the wastewater multi-stage purification system can be obtained through the water quality sensor. Compare the current water quality data with the previous water quality data. If the difference between the same data in the water quality data of the two is within the difference threshold range, it means that the water quality has not changed much before and after, and the flow buffer tank can be controlled to discharge sewage according to the first expected water inflow; if there is a situation where the difference between the same data in the water quality data of the two is not within the difference threshold range, it means that the water quality has changed a lot before and after, so the second expected water inflow can be generated, and the second expected water inflow is less than the first expected water inflow. Then control the sewage in the flow buffer tank to discharge sewage at the second expected water inflow; and send a first reminder message to the management terminal (such as the mobile terminal of the management personnel, the computer in the management room, etc.).

[0094] The second expected water inflow may be generated by: first expected water inflow - a*reference water inflow, where the reference water inflow can be set and modified. a represents the number of comparisons. For example, in the third comparison, if the water quality changes greatly before and after, the second expected water inflow = first expected water inflow - 3*reference water inflow.

[0095] In addition, if after adjusting the current expected water inflow, the current expected water inflow (the second expected water inflow corresponding to the current water quality) is lower than the water inflow threshold, and the current water quality still changes greatly compared with the previous water quality, it is necessary to obtain the offset value between the current water quality and the previous water quality, and then determine the treatment level of the wastewater multi-stage purification system according to the offset value, so as to adjust the wastewater multi-stage purification system according to the treatment level (for example, increase the aeration intensity, increase the dosage of the agent, etc.), and send the second reminder information to the management terminal. The larger the offset value, the higher the treatment level, and the stronger the treatment capacity of the wastewater multi-stage purification system.

[0096] The offset value is obtained as follows: after obtaining the water quality data, a value is assigned to the water quality data, and the difference between the two values ​​is the offset value. Each processing level corresponds to an offset value range. The processing level can be set and divided according to the actual situation, for example, divided into 4 levels, the first level has the weakest processing capacity, and the fourth level has the strongest processing capacity; the first level corresponds to the offset value range [1,3], the second level corresponds to the offset value range (3,5], the third level corresponds to the offset value range (5,7], and the fourth level corresponds to the offset value range (7,8].

[0097] Reference Figure 3 Furthermore, the control method may also include S310-S350:

[0098] S310, obtaining the current liquid level of the flow buffer pool;

[0099] S320, obtaining the flow volume of sewage stored in the flow buffer tank according to the current liquid level;

[0100] S330, obtaining a volume change rate according to the flow volume;

[0101] S340, obtaining the required water inflow flow rate of the flow buffer pool according to the volume change rate and the current expected water inflow flow rate;

[0102] S350, adjusting the valve opening of the drainage valve of the sewage discharge pipe according to the required water flow.

[0103] Specifically, for S340, the volume change rate and the current expected water inflow are input into a pre-built flow model to obtain the expected water inflow. The flow model is: =k + +A ;in is the inlet flow rate, k is a constant related to the flow buffer tank characteristics, h is the current liquid level, is the current expected water inflow, A is the cross-sectional area of ​​the flow buffer tank, and A is the volume change rate.

[0104] Enter the required water flow into x= 100%, obtain valve opening; is the maximum water flow rate when x=1.

[0105] The implementation principle of this embodiment is:

[0106] According to the historical sewage discharge data of the factory, the predicted total sewage discharge of the day is predicted, and then according to the predicted total discharge, the first expected water inflow of the wastewater multi-stage purification system is generated, and the actual buffer volume of the sewage discharged by the factory to the flow buffer tank on the day is periodically obtained to determine whether the actual buffer volume exceeds 1 times the first expected water inflow. If so, the sewage in the flow buffer tank is controlled to enter the wastewater multi-stage purification system with the first expected water inflow; the water quality of the water purified by the wastewater multi-stage purification system is monitored to obtain water quality data, and the current water quality data is compared with the previous water quality data. If the water quality changes greatly before and after, a second expected water inflow is generated, the sewage in the flow buffer tank is controlled to enter the wastewater multi-stage purification system with the second expected water inflow, and a first reminder message is sent;

[0107] In addition, if the expected water inflow is lower than the water inflow threshold after the expected water inflow is adjusted, the current water quality data is obtained after the wastewater multi-stage purification system has processed the wastewater. If the current water quality data is significantly different from the previous water quality, the offset value between the two is obtained, and the treatment level of the wastewater multi-stage purification system is determined according to the offset value, and the wastewater multi-stage purification system is adjusted according to the treatment level, and a second reminder message is sent;

[0108] In addition, when the flow buffer tank is discharging sewage, the current liquid level of the flow buffer tank can be obtained, and based on the current liquid level, the flow volume of the sewage stored in the flow buffer tank can be obtained, so that according to the flow volume, the volume change rate can be obtained, and then according to the volume change rate and the current expected water inflow, the required water inflow flow of the flow buffer tank can be obtained, and finally according to the required water inflow flow, the valve opening of the drain valve of the sewage discharge pipe is adjusted to enable the flow buffer tank to discharge sewage smoothly.

[0109] Based on the above method embodiment, the second embodiment of the present application discloses a control system for multi-stage purification of wastewater suitable for green factories. Figure 4 , the regulatory system may include:

[0110] The prediction module 101 is used to predict the total amount of sewage discharged on the day according to the historical sewage discharge data of the factory;

[0111] An expected water inflow generation module 102, used to generate a first expected water inflow of the wastewater multi-stage purification system according to the predicted total discharge amount;

[0112] The data acquisition module 103 is used to periodically acquire the actual buffer volume of sewage discharged by the factory to the flow buffer tank on the same day;

[0113] A judging module 104, used to judge whether the actual buffer volume exceeds 1 times the first expected water inflow volume;

[0114] The control module 105 is used to control the sewage in the flow buffer tank to enter the wastewater multi-stage purification system at a first expected water inflow when the judgment module 104 judges to be yes.

[0115] The modules of the control system for multi-stage purification of wastewater applicable to green factories correspond one to one with the control method for multi-stage purification of wastewater applicable to green factories, and no further details will be given here.

[0116] The third embodiment of the present application provides a terminal. As an implementation of the terminal, the terminal may include: a memory and a processor; wherein:

[0117] The memory is used to store the above-mentioned control program for multi-stage purification of wastewater applicable to green factories;

[0118] The processor is used to execute the program stored in the memory to implement the steps of the above-mentioned control method for multi-stage purification of wastewater applicable to green factories.

[0119] The memory may be connected to the processor via a communication bus, and the communication bus may be an address bus, a data bus, a control bus, etc.

[0120] In addition, the memory may include a random access memory (RAM) and may also include a non-volatile memory (NVM), such as at least one disk storage.

[0121] And the processor can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.

[0122] The above are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application in sequence. Any feature disclosed in this specification (including the abstract and drawings), unless otherwise stated, can be replaced by other equivalent or alternative features with similar purposes. That is, unless otherwise stated, each feature is only an example of a series of equivalent or similar features.

Claims

1. A control method for multi-stage purification of wastewater suitable for green factories, characterized in that: include: Based on the historical sewage discharge data of the factory, the total amount of sewage discharged on that day is predicted; generating a first expected water inflow of the wastewater multi-stage purification system according to the predicted total discharge amount; Periodically obtain the actual buffer volume of sewage discharged by the factory to the flow buffer tank on the day; Determining whether the actual buffer volume exceeds 1 times the first expected water inflow volume; If yes, controlling the sewage in the flow buffer tank to enter the wastewater multi-stage purification system at the first expected water inflow; If not, the flow buffer tank continues to store sewage; The step of generating a first expected water inflow of the wastewater multi-stage purification system according to the predicted total discharge volume comprises: Searching a historical sewage discharge database for a target historical total discharge amount similar to the predicted total discharge amount, wherein the similarity is characterized in that an absolute value of a difference between the predicted total discharge amount and the historical total discharge amount is less than a first threshold; If found, then retrieve the target historical water inflow volume set of the wastewater multi-stage purification system associated with the target historical total discharge volume, and use the first water inflow volume in the target historical water inflow volume set as the first expected water inflow volume; If not found, obtain m similar historical water inflows, and obtain the average value of the first water inflow of the historical water inflow set corresponding to the m historical water inflows, and use the average value as the first expected water inflow; similarity represents that the absolute value of the difference between the predicted total discharge and the historical total discharge exceeds the first threshold but is less than the second threshold.

2. A control method for multi-stage purification of wastewater suitable for green factories according to claim 1, characterized in that: The control method further comprises: Before the next water intake, obtaining current water quality data of the purified water discharged from the wastewater multi-stage purification system; Comparing the current water quality data with the previous water quality data; If the water quality changes greatly before and after, a second expected water inflow is generated, and the second expected water inflow is less than the first expected water inflow; the water quality changes greatly before and after refer to that the difference between the current water quality data and the previous water quality data of the same type is not within the difference threshold range; The sewage in the flow buffer tank is controlled to enter the wastewater multi-stage purification system at the second expected water inflow, and a first reminder message for cleaning the wastewater multi-stage purification system is sent.

3. A control method for multi-stage purification of wastewater suitable for green factories according to claim 1, characterized in that: The step of predicting the total amount of sewage discharged on the day according to the historical sewage discharge data of the factory comprises: Retrieve the historical sewage discharge data of the previous N days from the historical sewage discharge database; A weight is associated with each retrieved historical sewage discharge data, the sum of N weights is 1, and the closer to the current day, the greater the weight; the N historical sewage discharge data and N weights are input into a pre-built sewage discharge prediction model to obtain the predicted total discharge.

4. A control method for multi-stage purification of wastewater suitable for green factories according to claim 2, characterized in that: The control method further comprises: After the current expected water inflow is lower than the water inflow threshold, if the current water quality changes greatly compared with the previous water quality, the offset value of the two is obtained; the current expected water inflow refers to the second expected water inflow corresponding to the current water quality; According to the offset value, the treatment level of the wastewater multi-stage purification system is determined, the larger the offset value is, the higher the treatment level is, and the stronger the treatment capacity of the wastewater multi-stage purification system is; after obtaining the water quality data, a value is assigned to the water quality data, and the difference between the two values ​​is the offset value; According to the treatment level, the wastewater multi-stage purification system is adjusted and a second reminder message is sent.

5. The control method for multi-stage purification of wastewater suitable for green factories according to claim 1, characterized in that: The control method further comprises: Obtaining the current liquid level of the flow buffer pool; According to the current liquid level, obtaining the flow volume of the sewage in the flow buffer tank; According to the flow volume, obtaining a volume change rate; Obtaining the required water inflow flow rate of the flow buffer tank according to the volume change rate and the current expected water inflow flow rate; According to the required water flow rate, the valve opening of the drainage valve of the sewage discharge pipeline is adjusted.

6. A control method for multi-stage purification of wastewater suitable for green factories according to claim 5, characterized in that: The step of obtaining the required water inflow flow rate of the flow buffer tank according to the volume change rate and the current expected water inflow volume comprises: inputting the volume change rate and the current expected water inflow volume into a pre-built flow model to obtain the required water inflow flow rate; the flow model is Where Q in is the inlet flow rate, k is a constant related to the flow buffer tank characteristics, h is the current liquid level, Q out is the current expected water inflow, A is the cross-sectional area of ​​the flow buffer tank, is the volume change rate.

7. A control system for multi-stage purification of wastewater suitable for green factories, characterized in that: The control method for multi-stage purification of wastewater applicable to green factories as claimed in any one of claims 1 to 6, wherein the control system comprises: A prediction module (101), used for predicting the total amount of sewage discharged on the day according to the historical sewage discharge data of the factory; An expected water inflow generation module (102), used to generate a first expected water inflow of the wastewater multi-stage purification system according to the predicted total discharge amount; A data acquisition module (103) is used to periodically acquire the actual buffer volume of sewage discharged from the factory to the flow buffer tank on the same day; a judgment module (104) is used to judge whether the actual buffer volume exceeds 1 times the first expected water inflow; The control module (105) is used to control the sewage in the flow buffer tank to enter the wastewater multi-stage purification system at a first expected water inflow when the judgment module (104) judges to be yes.

8. A terminal, characterized in that: include: A memory storing a control program for multi-stage purification of wastewater suitable for a green factory; A processor is used to execute the program stored in the memory to implement the steps of the control method for multi-stage purification of wastewater applicable to green factories as described in any one of claims 1-6.

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