Urban sewage treatment plant energy saving and consumption reducing precise dosing control method

Abstract

The present application belongs to the technical field of sewage treatment, and discloses an energy-saving and consumption-reducing precise dosing control method for urban sewage treatment facilities. The method comprises the following steps: setting a predetermined total phosphorus concentration of the sewage treatment module in the data module as a reference for subsequent dosing control and effluent quality judgment; collecting the inflow flow and the inflow total phosphorus concentration of the sewage treatment module by the data module; determining the detection phosphorus reduction dosing amount of the dosing module according to the predetermined total phosphorus concentration, the inflow flow and the inflow total phosphorus concentration; converting the orthophosphate concentration into the total phosphorus concentration by installing an orthophosphate detection unit at the inflow end of the high-efficiency sedimentation tank and combining the experience coefficient obtained through historical data analysis, so as to calculate the dosing amount; and avoiding the dependence of the traditional system on the expensive and frequently-maintained total phosphorus online detector, thereby significantly reducing the system deployment cost and operation and maintenance difficulty.

Description

Technical Field

[0001] The present invention belongs to the technical field of sewage treatment, and specifically relates to a precise dosing control method for energy saving and consumption reduction of urban sewage treatment facilities. Background Art

[0002] Traditional sewage treatment often uses fixed ratios or empirical judgments for dosing operations, which makes it difficult to cope with fluctuations in water quality and quantity and complex working conditions, affecting operational efficiency and stability. With the development of technologies such as the Internet of Things, artificial intelligence, and big data, sewage treatment is transforming towards intelligence, especially in the field of precise dosing. Taking the patent with application number CN202110448545.9 as an example, the patent proposes a precise dosing and phosphorus removal method for a municipal sewage treatment system. This method adjusts the pump speed by controlling the frequency converter of the dephosphorization dosing pump so that the dosing flow displayed by the flow meter is consistent with the target flow, thereby achieving automatic adjustment of the dosing amount. However, in actual engineering applications, the existing precise dosing and phosphorus removal methods still have the following problems:

[0003] First, the prerequisite for precise dosing is to accurately understand the total phosphorus (TP) concentration in the wastewater. To achieve this, online phosphate detection equipment is usually required for real-time monitoring. However, during the long-term operation of such equipment, its key components such as diaphragms, MPV valves, and pumping pipes are consumables and require regular cleaning or replacement. If maintenance is not timely, it can easily lead to distorted or abnormal test data. For example, if the system mistakenly detects a low phosphorus concentration, it may trigger the lower limit of the polyaluminum dosage, resulting in insufficient dosage of the agent. If manual intervention and parameter adjustment are not carried out in time at this time, the total phosphorus content in the effluent will eventually exceed the standard, affecting the compliance rate of the discharged water quality.

[0004] Secondly, in addition to the phosphorus concentration in the wastewater, accurate dosing also requires mastering the key parameter of influent flow rate. Currently, most sewage treatment plants obtain influent flow information by installing flow meters. However, in certain process links, such as the front end of the high-efficiency sedimentation tank, due to the multiple branches, elbows or other structural limitations in the layout of the influent pipe, it is impossible to effectively install a flow meter, and thus it is impossible to obtain accurate influent flow rate data. In this case, the phosphorus reduction operation lacks the necessary input parameters, making it difficult to accurately implement the dosing control strategy, affecting the stability and economy of the treatment effect. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a precise dosing control method for energy saving and consumption reduction of urban sewage treatment facilities to solve the problems existing in the above-mentioned background technology.

[0006] To solve the above technical problems, the technical scheme of the present application is a kind of urban sewage treatment facilities energy saving and consumption reducing precise dosing control method, the sewage treatment facility includes sewage treatment module, data module and dosing module, the method includes the following steps:

[0007] S1, set the predetermined total phosphorus concentration of the sewage treatment module in the data module as the basis for subsequent dosing control and effluent water quality judgment;

[0008] S2, the data module collects the inflow end flow and the inflow end total phosphorus concentration of the sewage treatment module;

[0009] S3, the data module determines the detection phosphorus reduction dosing amount of the dosing module according to the predetermined total phosphorus concentration, the inflow end flow and the inflow end total phosphorus concentration;

[0010] S4, the dosing module performs precise dosing into the sewage treatment module according to the detection phosphorus reduction dosing amount.

[0011] As a preferred, the step S1 further includes setting the effluent end early warning total phosphorus concentration of the sewage treatment module in the data module, the effluent end early warning total phosphorus concentration value is higher than the predetermined discharge standard, for early warning of the risk of exceeding the standard;The method further includes the following steps:

[0012] S5, after the dosing module performs precise dosing, the data module collects the actual total phosphorus concentration of the effluent end of the sewage treatment module;

[0013] S51, when the actual total phosphorus concentration of the effluent end is less than or equal to the predetermined total phosphorus concentration of the discharge, the sewage treatment facility is normal operation and normal discharge;

[0014] S52, when the effluent end early warning total phosphorus concentration is greater than the actual total phosphorus concentration of the effluent end is greater than the predetermined total phosphorus concentration of the discharge, the sewage treatment facility is normal discharge, and the data module records the difference between the actual total phosphorus concentration of the effluent end and the predetermined total phosphorus concentration of the discharge;

[0015] S53, when the actual total phosphorus concentration of the effluent end is greater than the effluent end early warning total phosphorus concentration, an alarm mechanism is triggered, and the sewage treatment facility stops running, and manual intervention is required to investigate the cause.

[0016] Further, the data module includes a data acquisition unit for collecting the inflow end total phosphorus concentration;The step S52 includes the following steps:

[0017] S521, the difference between the actual total phosphorus concentration of the effluent end and the predetermined total phosphorus concentration of the discharge is taken as the independent variable of time to establish a linear regression mathematical model to reflect the error trend with time.

[0018] S522. Based on the systematic error or random error in the process of collecting the total phosphorus concentration at the water inlet by the linear regression model feedback data module, evaluate whether there is an abnormality in the data acquisition unit; when the error is a systematic error, obtain the abnormal phosphorus reduction dosage based on the difference between the actual total phosphorus concentration at the water outlet and the predetermined discharge total phosphorus concentration, which is used to dynamically compensate for the current dosing strategy; then, periodically correct the dosage of the dosing module so that the dosage is adjusted to the sum of the detected phosphorus reduction dosage and the abnormal phosphorus reduction dosage, thereby realizing intelligent optimization and self-correction of the dosing process.

[0019] Furthermore, the step S52 further includes the following steps:

[0020] S523. Without introducing the abnormal phosphorus-reducing dosage, the linear regression model is used to analyze the changing trend of the total phosphorus concentration acquisition error at the water inlet; the cleaning and maintenance time of the data acquisition unit is determined, and the system issues an early maintenance warning signal accordingly to remind the operation and maintenance personnel to clean or replace the data acquisition unit to prevent potential distortion or abnormality of the detection data.

[0021] Furthermore, the step S52 further includes the following steps:

[0022] S524. After the abnormal phosphorus-reducing dosage is introduced into the dosing module, the data module continues to record the difference between the actual total phosphorus concentration at the outlet and the set emission limit; based on the updated data set, a segmented regression mathematical model is established with time as the independent variable to identify the error change characteristics in different stages; in the segmented regression model, the error of the current stage is cumulatively added to the errors of all previous stages to form a comprehensive error evaluation; based on the comprehensive error evaluation result, a new abnormal phosphorus-reducing dosage is recalculated; the dosage of the dosing module is periodically adjusted to achieve continuous optimization of dosing control; at the same time, based on the error change trend, the system can determine whether the data acquisition unit needs to be maintained in advance to improve equipment reliability and operational stability.

[0023] Furthermore, the sewage treatment module includes a high-efficiency sedimentation tank; the data acquisition unit is installed at the water inlet end of the high-efficiency sedimentation tank for real-time monitoring of the inlet water quality; the water inlet flow, the total phosphorus concentration at the water inlet end and the actual total phosphorus concentration at the water outlet end collected by the data module are all derived from the operation data of the high-efficiency sedimentation tank; the data acquisition unit is used to detect the orthophosphate concentration in the high-efficiency sedimentation tank, and to infer the total phosphorus concentration at the water inlet end based on the orthophosphate concentration, thereby inferring the detection phosphorus reduction dosage.

[0024] Further, the sewage treatment module further comprises an intermediate lifting pump house; by adopting a constant liquid level control strategy in the intermediate lifting pump house, stable hydraulic conditions of the sewage in the conveying process are ensured; the water inflow of the intermediate lifting pump house is controlled to be equal to the water inflow of the high-efficiency sedimentation tank, so that the dynamic balance of the water quantity in the whole process is realized.

[0025] Further, the intermediate lifting pump house is provided with a water pump, a liquid level detection unit and a flow detection unit; the water pump is used for conveying the sewage from the intermediate lifting pump house to the high-efficiency sedimentation tank; the liquid level detection unit is used for detecting the liquid level change of the intermediate lifting pump house, and converting the liquid level signal into an electric signal and transmitting the electric signal to the data module; the data module automatically adjusts the running state (such as the rotating speed) of the water pump according to the difference between the set liquid level and the actual liquid level, so that the closed-loop accurate control of the liquid level is realized; the flow detection unit is arranged at the water inflow end of the intermediate lifting pump house, and is used for collecting the sewage flow entering the system in real time.

[0026] Further, the data module is built-in with a PID control algorithm, which can dynamically adjust the running frequency and rotating speed of the water pump according to the electric signal fed back by the liquid level detection unit, so that the high-precision control of the liquid level of the intermediate lifting pump house is realized; the water pump is configured in a multiple-parallel operation mode to meet the flow demand under different working conditions, and improve the redundancy and reliability of the system; the PID control algorithm is further integrated with water pump rotation logic, that is, when a water pump continuously runs for a preset time, the system automatically switches to another water pump to run; at the same time, the original running water pump can be switched to a power frequency running state or directly stopped running, so as to realize the balanced distribution of the cumulative running time and the continuous running time between the water pumps.

[0027] The technical effects of the present application mainly embody in the following aspects:

[0028] By installing a positive phosphate detection unit at the water inflow end of the high-efficiency sedimentation tank and combining the experience coefficient obtained through historical data analysis, the positive phosphate concentration is converted into the total phosphorus concentration, so as to be used for calculating the dosing amount. This method avoids the dependence of the traditional system on the expensive and frequently maintained total phosphorus online detector, significantly reduces the system deployment cost and operation and maintenance difficulty, and at the same time maintains high detection stability and response speed.

[0029] By time series modeling the difference between the actual total phosphorus concentration at the water outflow end and the set discharge limit value, and using linear regression to analyze the change trend of the error with time, it is judged whether the error is a systematic error or a random error. This mechanism enables the system to have a preliminary "self-diagnosis" ability, and can deduce whether the input data is accurate from the result, to provide a basis for subsequent compensation strategies.

[0030] The concept of "abnormal phosphorus reduction dosing amount" is introduced to realize dynamic compensation of the dosing strategy. When the error is identified as a system error, the system calculates the "abnormal phosphorus reduction dosing amount" based on the deviation value and superimposes it on the original detection dosing amount to form a new total dosing instruction. This compensation mechanism effectively addresses the problem of insufficient dosing caused by aging or calibration failure of the detection equipment, ensuring that good treatment effect can be maintained even in the presence of data deviation.

[0031] By setting a flow detection unit in the intermediate lifting pump house and ensuring that its inlet flow is equal to that of the high-efficiency sedimentation tank, the system realizes dynamic balance of water quantity in the entire process. This mechanism solves the problem of some sewage treatment plants that cannot obtain accurate inlet flow due to pipeline structure limitations, providing reliable data support for dosing amount calculation. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is a schematic diagram of the sewage treatment facility in the present application;

[0033] Figure 2 is a step flow chart of the energy-saving and consumption-reducing precise dosing control method in the present application;

[0034] Figure 3 is a data schematic diagram of Table 2. DETAILED DESCRIPTION

[0035] The specific embodiments of the present application will be further described in detail below in combination with the drawings, so that the technical scheme of the present application is easier to understand and master. In the embodiments, it should be understood that the orientations or positional relationships indicated by the terms "intermediate", "upper", "lower", "top", "right side", "left end", "upper", "back", "middle" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, in the present specific embodiments, if the connection or fixing manner between the components is not specifically stated, the connection or fixing manner can be by bolt fixing or pin fixing commonly used in the prior art, or pin shaft connection, and therefore, in the present embodiments, it will not be described in detail.

[0036] The energy-saving and consumption-reducing precise dosing control method for urban sewage treatment facilities provided by the present application is mainly applied to phosphorus reduction dosing in high-efficiency sedimentation tanks, especially in dealing with key problems such as errors of online detection equipment and lack of inlet flow; but it is not limited to this, and can also be used in other same or similar production processes.

[0037] Example One

[0038] The present embodiment discloses a precise dosing control method for energy conservation and consumption reduction in urban sewage treatment facilities, wherein the sewage treatment facility comprises a sewage treatment module, a data module and a dosing module; the sewage treatment module mainly comprises a high-efficiency sedimentation tank and an intermediate lift pump room. The high-efficiency sedimentation tank is a key process unit for achieving phosphorus removal from sewage, and a data acquisition unit for real-time monitoring of orthophosphate concentration is installed at its water inlet; the intermediate lift pump room is responsible for regulating water volume and stabilizing transportation. The data module integrates functions such as online water quality and flow sensors, PID control algorithms, linear regression and segmented regression analysis models, and is responsible for collecting, processing and feedback of operating data, and participating in the formulation and optimization of dosing strategies. The dosing module is composed of a variable-frequency controlled polyaluminum dosing pump, which performs dynamic dosing operations according to the dosing instructions output by the data module to achieve effective removal of total phosphorus (TP).

[0039] The method comprises the following steps:

[0040] S1. Set the predetermined total phosphorus concentration for the sewage treatment module in the data module, which serves as a benchmark for subsequent dosing control and effluent quality assessment. Simultaneously, set a warning total phosphorus concentration at the sewage treatment module's outlet. If the warning total phosphorus concentration exceeds the predetermined discharge standard, it serves as an early warning of the risk of exceeding the standard. By introducing a dual threshold mechanism (standard limit + warning limit), not only does this ensure compliance assessment, but it also provides forward-looking warning capabilities, facilitating timely adjustment of control strategies and preventing deterioration of effluent quality.

[0041] S2. The data module collects the inlet flow rate and total phosphorus concentration of the sewage treatment module; a data acquisition unit is deployed at the inlet of the high-efficiency sedimentation tank to collect the orthophosphate concentration at the inlet in real time; a flow detection unit at the inlet of the intermediate lift pump room is used to obtain the accurate inlet flow rate; all data is uploaded to the data module for processing via the PLC or DCS system. Moving the data collection point to the intermediate lift pump room solves the problem of flow meter installation in traditional processes due to pipeline structural limitations, ensures the accuracy of the inlet flow rate, and provides a reliable basis for subsequent dosing calculations.

[0042] Regarding the calculation of total phosphorus concentration at the inlet of the high-efficiency sedimentation tank based on the orthophosphate concentration at the inlet, see Table 1 for detailed experimental data:

[0043] Table 1 shows the data collection of total phosphorus and orthophosphate in a high-efficiency sedimentation tank at a sewage treatment plant in an urban area of ​​Foshan City, Guangdong Province.

[0044]

[0045] Based on the above data, the total phosphorus and orthophosphate in the high-efficiency sedimentation tank in the sewage treatment plant are analyzed as follows: Through data comparison, the ratio of orthophosphate concentration to total phosphorus concentration in the high-efficiency sedimentation tank is between 0.8-0.95. Therefore, the total phosphorus concentration at the inlet end can be inferred by collecting the orthophosphate concentration at the inlet end; in the initial stage of project implementation, a coefficient of 0.8 can be used for data conversion to guide the addition of chemicals.

[0046] This step optimizes and solves the problem of dependence on total phosphorus online detection equipment. Traditional precise dosing relies on total phosphorus (TP) online detectors, but such equipment has complex structures, frequent maintenance, and high costs. This method collects orthophosphate ( ) concentration, and convert it into total phosphorus concentration based on empirical coefficients, reducing dependence on expensive total phosphorus detection equipment; the orthophosphate sensor (orthophosphate analyzer) has a relatively simple structure, stable operation, and a long maintenance cycle, which significantly improves the sustainable operation capability of the system. At the same time, orthophosphate detection has a fast response speed and a high data update frequency, which can reflect water quality changes more promptly; using real-time orthophosphate data to infer total phosphorus concentration, the required dosage can be quickly calculated to achieve dynamic adjustment; in the case of large fluctuations in water quality or sudden abnormal water inflow, the system can still maintain a high sensitivity in dosing control; improve the system's adaptability to sudden changes in water quality, and enhance the timeliness and accuracy of dosing control. In addition, for some process nodes where total phosphorus detection equipment or flow meters cannot be installed (such as the front end of a high-efficiency sedimentation tank), the use of orthophosphate detection and conversion methods can be used as an effective alternative; it is particularly suitable for resource-constrained scenarios such as the renovation of old sewage treatment plants and small sewage treatment stations in remote areas.

[0047] S3, the data module determines the detection phosphorus reduction dosage of the dosing module according to the predetermined total phosphorus concentration of the discharge, the water inlet flow rate and the total phosphorus concentration of the water inlet;

[0048] Phosphorus reduction dosage for detection = (total phosphorus concentration at the water inlet - expected total phosphorus concentration at discharge) * water inlet flow * K;

[0049] K is the dosing coefficient. Please refer to Xiong Jianying's "Dosing Design of Various Chemical Agents in Wastewater Treatment Projects" for the following information: "The dosage of iron salts and aluminum salts for phosphorus removal is generally 1.5 to 3.0 mol of metal salt / mol of phosphorus removed." Taking aluminum salt as an example, the specific dosage is as follows:

[0050] The chemical reaction formula for aluminum salt to remove phosphate:

[0051] K is taken as 1.5, that is, the mass ratio of the two is

[0052] Assuming that the total phosphorus of the high-efficiency sedimentation tank is 1.5 mg / L, the daily water treatment capacity is 150,000 tons, the total phosphorus of the effluent is 0.4 mg / L, and the dosage of 8% aluminum salt (aluminum salt is calculated by ), the total phosphorus removal amount can be calculated

[0053]

[0054] The total phosphorus removal amount is (1.5-0.4) x 150,000 = 165 kg

[0055] The aluminum dosage is 1.3 x 165 = 214.5 kg

[0056] The aluminum salt dosage is 214.5 ÷ (54 / 102) = 405.17 kg

[0057] The actual PAC (8%) dosage is 405.17 ÷ 8% = 5064.58 kg

[0058] The drug consumption per kiloton of water is 5064.58 ÷ (150,000 ÷ 1000) = 33.76 kg / ton of water

[0059] S4, the dosing module according to the detection of phosphorus reduction dosage, to the sewage treatment module for precise dosing.

[0060] S5, after the dosing module executes precise dosing, the data module collects the actual total phosphorus concentration of the effluent end of the sewage treatment module;

[0061] S51, when the actual total phosphorus concentration of the effluent end is less than or equal to the predetermined discharge total phosphorus concentration, the sewage treatment facility is normally running and normally discharging;

[0062] S52, when the effluent end warning total phosphorus concentration is greater than the actual total phosphorus concentration of the effluent end is greater than the predetermined discharge total phosphorus concentration, the sewage treatment facility is normally discharging, and the data module records the difference between the actual total phosphorus concentration of the effluent end and the predetermined discharge total phosphorus concentration;

[0063] The sub-steps of step S52 are as follows:

[0064] S521, the difference between the actual total phosphorus concentration of the effluent end and the predetermined discharge total phosphorus concentration is established as a linear regression mathematical model with time as the independent variable, reflecting the trend of error change over time;

[0065] S522, the linear regression model feedback data module exists in the process of collecting the total phosphorus concentration of the water inlet end System error (continuity) or random error (accidental), evaluate whether the data acquisition unit exists abnormal;

[0066] If the trend line of the difference shows a significant positive offset and the slope is stable, it is determined that the system error; combined with the existing technology application phosphate detection equipment needs to be cleaned or replaced regularly, to ensure the stability and reliability of the data; therefore, the system error can be identified as caused by the phosphate detection equipment. If the value of the trend line fluctuates greatly but has no obvious trend, it is determined that the random error is. When the error is a system error, the difference between the actual total phosphorus concentration of the water outlet end and the predetermined discharge total phosphorus concentration is obtained Abnormal phosphorus reduction dosage is used to dynamically compensate the current dosing strategy;

[0067] Abnormal phosphorus reduction dosage = difference between actual total phosphorus concentration of water outlet end and predetermined discharge total phosphorus concentration * inlet flow rate * K;

[0068] Subsequently, the dosing amount of the dosing module is corrected, and the dosing amount is adjusted to the sum of the detection phosphorus reduction dosage and the abnormal phosphorus reduction dosage, so as to realize intelligent optimization and self-correction of the dosing process.

[0069] S523, without introducing the abnormal phosphorus reduction dosage, that is, the abnormal dosing mechanism has not been triggered; the change trend of the total phosphorus concentration acquisition error of the water inlet end is analyzed by the linear regression model; when the absolute value of the slope exceeds a certain threshold, it indicates that the error is cumulative growth trend; It is determined that the data acquisition unit (such as orthophosphate sensor) has aging or pollution phenomenon; the system sends a cleaning / replacement warning signal to prompt manual intervention maintenance; without waiting for the water outlet to exceed the standard, the equipment abnormality can be found in advance, and the risk of out-of-control dosing caused by detection distortion is reduced.

[0070] S524, after the dosing module introduces the abnormal phosphorus reduction dosage, the abnormal dosing mechanism is triggered; from a single linear regression to a segmented regression model. The entire running period is divided into multiple stages, and the difference between the actual total phosphorus concentration of the water outlet end and the predetermined discharge total phosphorus concentration is modeled independently in each stage; At the same time, consider the current stage error and historical cumulative error to form a comprehensive error evaluation index; based on the updated data set, a segmented regression mathematical model is established with time as the independent variable, which is used to identify the error change characteristics in different stages; In the segmented regression model, the error of the current stage is added to the cumulative error of all previous stages to form a new error evaluation basis.

[0071] According to the new error evaluation results, the new abnormal phosphorus reduction dosage is recalculated; the periodic adjustment is made to the drug delivery module to ensure that the drug delivery strategy is always in the optimal state. At this time, the periodicity is to add the abnormal phosphorus reduction dosage calculated based on the error caused by the phosphorus detection device to the drug delivery module as the starting point.

[0072] At the same time, based on the error change trend, the system can judge whether the data acquisition unit needs to be maintained in advance to improve the reliability and stability of the equipment.

[0073] S53, when the actual total phosphorus concentration of the outlet is greater than the warning total phosphorus concentration of the outlet, an alarm mechanism is triggered, and the sewage treatment facility stops running, and manual intervention is used to investigate the cause.

[0074] Regarding the energy-saving and consumption-reducing precise dosing control method in actual application, the water quantity, polyaluminum chloride dosage, and polyaluminum chloride consumption are handled; the specific experimental data are shown in Table 2:

[0075] Table 2 is each data record of a sewage treatment plant in a certain city of Foshan, Guangdong Province after the application of the above method;

[0076]

[0077] The following is an introduction to the sewage treatment facility:

[0078] The sewage treatment module: taking the high-efficiency sedimentation tank as the core treatment unit, responsible for the effective removal of suspended solids and total phosphorus (TP) in sewage; the data module: integrating data acquisition, error identification, model calculation, PID control, and other functions, is the "brain" of the entire system; the drug delivery module: based on the output instructions of the data module, it performs dynamic dosing operation to realize precise control of total phosphorus. Among them, the high-efficiency sedimentation tank and the intermediate booster pump house are two key nodes in the sewage treatment process, respectively responsible for water quality purification and water quantity regulation, and form a closed-loop linkage through a sensor network and intelligent control algorithm to ensure the stability and energy saving of the entire system.

[0079] The data acquisition unit is installed at the water inlet end of the high-efficiency sedimentation tank and is used for real-time monitoring of the water inlet quality; the water inlet flow, the total phosphorus concentration at the water inlet end and the actual total phosphorus concentration at the water outlet end collected by the data module are all derived from the operation data of the high-efficiency sedimentation tank; the data acquisition unit is used for detecting the orthophosphate concentration in the high-efficiency sedimentation tank, and the water inlet total phosphorus concentration is calculated according to the orthophosphate concentration, so as to calculate the detected phosphorus reduction dosing amount. The empirical relationship between the orthophosphate concentration and the total phosphorus concentration (such as the initial coefficient 0.8) is used to estimate the water inlet total phosphorus (TP) concentration; based on the estimation result, the required "detected phosphorus reduction dosing amount" is calculated in combination with the water inlet flow. The traditional high-cost and easy-to-maintain total phosphorus online detector is replaced; the water quality sensing capability with low cost and high stability is realized; the dynamic adjustment and error compensation mechanism of the subsequent dosing strategy are supported. The orthophosphate data is used to replace the total phosphorus detection, which reduces the dependence on equipment while maintaining the dosing control accuracy, and is suitable for various sewage treatment scenarios.

[0080] By adopting the constant liquid level control strategy in the intermediate lifting pump house, it is ensured that the sewage maintains stable hydraulic conditions during the conveying process; the water inlet flow of the intermediate lifting pump house is controlled to be equal to the water inlet flow of the high-efficiency sedimentation tank, so as to realize the dynamic balance of the water quantity in the whole process; the intermediate lifting pump house is provided with a water pump, a liquid level detection unit and a flow detection unit; the water pump is used for conveying the sewage from the intermediate lifting pump house to the high-efficiency sedimentation tank; the liquid level detection unit is used for detecting the liquid level change of the intermediate lifting pump house and converting the liquid level signal into an electric signal which is transmitted to the data module; the data module automatically adjusts the running state (such as the rotating speed) of the water pump according to the difference between the set liquid level and the actual liquid level, so as to realize the closed-loop accurate control of the liquid level; the flow detection unit is arranged at the water inlet end of the intermediate lifting pump house and is used for real-time acquisition of the sewage flow entering the system. Accurate water quantity input parameters are provided for dosing control, and at the same time, the problem of excessive or insufficient dosing caused by water quantity imbalance is prevented.

[0081] The data module is built-in with a PID control algorithm, which can dynamically adjust the running frequency and rotating speed of the water pump according to the electric signal fed back by the liquid level detection unit, so as to realize high-precision control of the liquid level of the intermediate lifting pump house; the water pump is configured in a multiple parallel operation mode to meet the flow demand under different working conditions and improve the redundancy and reliability of the system; the PID control algorithm is also integrated with water pump rotation logic, that is, when a water pump continuously runs for a preset time, the system automatically switches to another water pump for operation; at the same time, the original running water pump can be switched to a power frequency operation state or directly stopped running, so as to realize the balanced distribution of the cumulative running time and the continuous running time between the water pumps.

[0082] Of course, the above are only typical examples of the present application, in addition to which the present application can have other various specific embodiments, and any technical solution formed by equivalent replacement or equivalent transformation falls within the scope of the present application.

Claims

1. A method for precise dosing control of energy saving and consumption reduction of a municipal wastewater treatment plant, wherein the wastewater treatment plant comprises a wastewater treatment module, a data module and a dosing module, characterized in that, The method comprises the following steps: S1, setting a predetermined total phosphorus concentration of the sewage treatment module in the data module as a reference for subsequent dosing control and effluent quality judgment; Setting an early warning total phosphorus concentration at the effluent end of the sewage treatment module in the data module, the early warning total phosphorus concentration value being higher than the predetermined total phosphorus concentration, for early warning of the risk of exceeding the standard; S2, collecting the inflow end flow and the inflow end total phosphorus concentration of the sewage treatment module by the data module, the data module comprising a data acquisition unit for collecting the inflow end total phosphorus concentration; S3, determining the detection phosphorus reduction dosing amount of the dosing module according to the predetermined total phosphorus concentration, the inflow end flow and the inflow end total phosphorus concentration by the data module; S4, performing accurate dosing into the sewage treatment module according to the detection phosphorus reduction dosing amount by the dosing module; S5, collecting the actual total phosphorus concentration at the effluent end of the sewage treatment module by the data module after the dosing module performs accurate dosing; S52, when the early warning total phosphorus concentration at the effluent end is greater than the actual total phosphorus concentration at the effluent end, which is greater than the predetermined total phosphorus concentration, the sewage treatment facility is normally discharged, and the data module records the difference between the actual total phosphorus concentration at the effluent end and the predetermined total phosphorus concentration; S521, taking the difference between the actual total phosphorus concentration at the effluent end and the predetermined total phosphorus concentration as the independent variable, establishing a linear regression model to reflect the trend of error change over time; S522, based on the linear regression model, feeding back the system error or random error existing in the process of collecting the inflow end total phosphorus concentration by the data module, and evaluating whether the data acquisition unit is abnormal; When the error is a system error, an abnormal phosphorus reduction dosing amount is obtained based on the difference between the actual total phosphorus concentration at the effluent end and the predetermined total phosphorus concentration, which is used for dynamic compensation of the current dosing strategy; Subsequently, the dosing amount of the dosing module is corrected, and the dosing amount is adjusted to the sum of the detection phosphorus reduction dosing amount and the abnormal phosphorus reduction dosing amount, so as to realize intelligent optimization and self-correction of the dosing process; The sewage treatment module comprises a high-efficiency sedimentation tank; the data acquisition unit is installed at the inflow end of the high-efficiency sedimentation tank for real-time monitoring of the inflow water quality; the inflow end flow, the inflow end total phosphorus concentration and the actual total phosphorus concentration at the effluent end collected by the data module are all derived from the operation data of the high-efficiency sedimentation tank; the data acquisition unit is used to detect the orthophosphate concentration in the high-efficiency sedimentation tank, and the inflow end total phosphorus concentration is calculated according to the orthophosphate concentration, so as to calculate the detection phosphorus reduction dosing amount.

2. The energy-saving and consumption-reducing accurate dosing control method for urban sewage treatment facilities according to claim 1, wherein The step S5 further comprises the following steps: S51, when the actual total phosphorus concentration at the effluent end is less than or equal to the predetermined total phosphorus concentration, the sewage treatment facility is normally operated and discharged; S53、When the actual total phosphorus concentration at the effluent end is greater than the early warning total phosphorus concentration at the effluent end, an alarm mechanism is triggered, and the sewage treatment facility stops running, and manual intervention is required to investigate the cause.

3. The energy-saving and consumption-reducing precise dosing control method for a municipal sewage treatment facility according to claim 1, characterized in that, The step S52 further comprises the following steps: S523, without introducing the abnormal phosphorus reduction dosing amount, the linear regression model is used to analyze the variation trend of the total phosphorus concentration collection error of the influent end; The cleaning and maintenance time of the data acquisition unit is determined, and the system sends an early maintenance warning signal to remind the operation and maintenance personnel to clean or replace the data acquisition unit, preventing potential detection data distortion or abnormality.

4. The energy-saving and consumption-reducing precise dosing control method for a municipal sewage treatment facility according to claim 1, characterized in that: The step S52 further comprises the following steps: S524, after the dosing module introduces the abnormal phosphorus reduction dosing amount, the data module continues to record the difference between the actual total phosphorus concentration and the predetermined discharge total phosphorus concentration at the effluent end; Based on the updated data set, a segmented regression model is established with time as the independent variable, which is used to identify the difference between the actual total phosphorus concentration and the predetermined discharge total phosphorus concentration in different stages; In the segmented regression model, the difference in the current stage is added to the cumulative difference in all previous stages to form a comprehensive error evaluation; According to the comprehensive error evaluation result, a new abnormal phosphorus reduction dosing amount is recalculated; the dosing amount of the dosing module is periodically adjusted to realize continuous optimization of dosing control; At the same time, based on the variation trend of the comprehensive error evaluation, the system can determine whether the data acquisition unit needs early maintenance, improving the reliability and stability of the equipment.

5. The energy-saving and consumption-reducing precise dosing control method for a municipal sewage treatment facility according to claim 1, characterized in that: The sewage treatment module further comprises an intermediate lifting pump house; By using a constant liquid level control strategy in the intermediate lifting pump house, stable hydraulic conditions are maintained during the transportation of sewage; The influent end flow of the intermediate lifting pump house is controlled to be equal to the influent end flow of the high-efficiency sedimentation tank, thereby realizing dynamic balance of water quantity in the entire process.

6. The energy-saving and consumption-reducing precise dosing control method for a municipal sewage treatment facility according to claim 5, characterized in that: The intermediate lifting pump house is provided with a water pump, a liquid level detection unit and a flow detection unit; The water pump is used to transport sewage from the intermediate lifting pump house to the high-efficiency sedimentation tank; The liquid level detection unit is used to detect the change of the liquid level of the intermediate lifting pump house and convert the liquid level signal into an electrical signal, which is transmitted to the data module; the data module automatically adjusts the operating state of the water pump according to the difference between the set liquid level and the actual liquid level, thereby realizing closed-loop precise control of the liquid level; The flow detection unit is arranged at the influent end of the intermediate lifting pump house and is used to collect the sewage flow entering the system in real time.

7. The energy-saving and consumption-reducing precise dosing control method for a municipal sewage treatment facility according to claim 6, characterized in that: The data module is built-in with a PID control algorithm, which can dynamically adjust the running frequency and rotating speed of the water pump according to the electric signal fed back by the liquid level detection unit, so as to realize high-precision control over the liquid level in the intermediate booster pump house. The water pump is configured in a parallel running mode, so as to meet the flow demand under different working conditions and improve the redundancy and reliability of the system. The PID control algorithm is also integrated with water pump rotation logic, that is, when a water pump continuously runs for a preset time, the system automatically switches to another water pump for running; meanwhile, the original running water pump can be switched to a power frequency running state or directly stopped for running, so as to realize balanced distribution of the cumulative running time and continuous running time among the water pumps.

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