A sewer network pollutant concentration control method, system, device and medium

Abstract

This invention discloses a method, system, equipment, and medium for controlling pollutant concentration in wastewater pipe networks, relating to the field of drainage system technology. The method includes: obtaining the mass flushing rate of pollutants under pipe scouring; collecting the amount of components generated by chemical reactions within the pipe; constructing a pollutant reaction model; and, based on convection diffusion, obtaining the concentration changes of sediments following wastewater, constructing a convection diffusion reaction model. The mass flushing rate, pollutant reaction model, and convection diffusion reaction model are coupled to obtain a pollutant concentration prediction coupling model. The pollutant concentration in the wastewater pipe network is predicted based on the pollutant concentration prediction coupling model, and the pollutant concentration is divided into multiple levels. Different flushing methods are selected within different levels to control the pollutant concentration in the wastewater pipe network. This invention can adopt different methods according to different actual scenarios, thereby controlling the pollutant concentration within a reasonable range.

Description

Technical Field

[0001] This invention relates to the field of drainage system technology, and in particular to a method, system, equipment and medium for controlling pollutant concentration in sewage pipe networks. Background Technology

[0002] In the current drainage system, sewage is discharged into the sewage treatment plant through the pipeline network. During the process of sewage flowing through the pipeline, sediment is washed away and mixed with the sewage.

[0003] In existing technologies, traditional pollution source control technologies mostly rely on single-point monitoring or manual sampling and analysis methods to control wastewater through analysis results. However, this approach is difficult to fully reflect the spatiotemporal variation characteristics of pollutants in complex sewage pipe networks. Especially under heavy rainfall, sediments are washed away to varying degrees, leading to an increase in pollutant concentration in wastewater. This characteristic in existing technologies can cause wastewater treatment units to be unable to respond in time, easily causing overflows, odors, and other problems, affecting the urban living environment and reducing the safety and stability of drainage systems. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of the prior art by providing a method, system, equipment, and medium for controlling pollutant concentration in sewage pipe networks, thereby solving the problems in the prior art.

[0005] The present invention specifically provides the following technical solution: A method for controlling pollutant concentration in a wastewater pipe network includes the following steps: The rainfall intensity in the sewage pipe network area is obtained, and a pipe flow change model is constructed based on the rainfall intensity. The mass scouring rate of pollutants under pipe scouring is obtained based on the pipe flow change model. The amount of components generated by chemical reactions in the pipe is collected, and a pollutant reaction model is constructed. Based on the convection diffusion in the pipe, the concentration change of sediments in the pipe caused by sewage is obtained, and a convection diffusion reaction model is constructed. By coupling the mass scouring rate, the pollutant reaction model, and the convection-diffusion reaction model, a coupled model for predicting pollutant concentration is obtained. The pollutant concentration in the sewage pipe network is predicted based on the pollutant concentration prediction coupling model, and the pollutant concentration is divided into multiple levels. Different flushing methods are selected within different levels to control the pollutant concentration in the sewage pipe network.

[0006] Preferably, a pipeline flow variation model is constructed based on the relationship between precipitation, interception, and initial loss in rainfall intensity. The specific expression is as follows: ; in, Pipeline flow rate under different rainfall intensities; PThis refers to precipitation. S For the amount to be retained; This is the initial loss amount. .

[0007] Preferably, the mass scouring rate of pollutants under pipeline scouring is obtained based on the pipeline flow rate change model; the amount of components generated by chemical reactions within the pipeline is collected to construct a pollutant reaction model; based on convection diffusion within the pipeline, the concentration change of sediments in the pipeline caused by sewage is obtained to construct a convection diffusion reaction model, specifically: Based on the positive correlation between pipeline flow rate and rainfall shear force, the rainfall shear force is determined using the pipeline flow rate output by the pipeline flow rate variation model, and then the rainfall shear force is compared with the first... i The relationship between the critical shear forces of the layers is used to obtain the mass scour rate of contaminants under pipeline scour. A layered scour resistance model is then constructed based on this mass scour rate. Specifically: ; The pollutant reaction model is as follows: ; The convective-diffusion reaction model is as follows: ; in, Let be the layered erosion resistance model, representing the first stratified erosion resistance model. i The mass erosion rate of the layer; To stratify sediments; Rainfall intensity; For the first i The erosion rate constant of the layer; For rainfall shear force, ; Let be the rainfall intensity constant. The rainfall intensity per unit time is expressed using hydraulic formulas from the pipe flow rate. Obtained; For the first i The critical shear force of the layer; u is the flow velocity inside the pipe during rainfall; This represents the pollutant transformation rate constant in stratified sediments; This represents the concentration of contaminants in the stratified sediments. The concentrations of different pollutants at a specific moment during rainfall; This is a pollutant reaction model, representing the amount of components generated due to chemical reactions; denoted as the diffusion coefficient for different pollutants.

[0008] Preferably, the mass scouring rate, the pollutant reaction model, and the convection-diffusion reaction model are coupled to obtain a pollutant concentration prediction coupled model, specifically: By coupling the mass scouring rate, the pollutant reaction model, and the convection-diffusion reaction model, an initial coupled model is obtained, the specific expression of which is: ; When the influence of the diffusion coefficient is less than a threshold, the diffusion coefficient terms for different pollutants in the initial coupling model are removed, based on known concentrations. A pollutant concentration prediction coupling model is obtained, and the concentrations of different pollutants are predicted using the pollutant concentration prediction coupling model. The specific expression is as follows: ; in, For propagation speed, describe location x Over time t The changes.

[0009] Preferably, when controlling the pollutant concentration in the sewage pipe network, the pollutant concentration in the sewage pipe network is controlled based on a sediment flushing control device, which includes a drainage pipe, a regulating pump, a discharge pipe, and a water storage tank.

[0010] Preferably, the selection of different flushing methods within different levels to control the pollutant concentration in the sewage pipe network specifically includes: When the pollutant concentration is within the first level range, the flow rate of sewage through the drainage pipeline is adjusted to a set threshold using a regulating pump. When the pollutant concentration is within the second level range, add a pollutant-reducing agent into the sewage pipe network; When the pollutant concentration is within the range of the third level, the sewage is diverted to the storage tank using the discharge pipe; The first, second, and third levels are classified according to the pollutant concentration from low to high.

[0011] Preferably, the first level corresponds to a rainfall speed between 0.1 m / s and 0.3 m / s, the second level corresponds to a rainfall speed between 0.3 m / s and 0.5 m / s, and the third level corresponds to a rainfall speed greater than 0.5 m / s.

[0012] This invention provides a sewage pipe network pollutant concentration control system, comprising: The modeling module is used to collect rainfall intensity in the sewage pipe network area, construct a pipe flow change model based on rainfall intensity, and obtain the mass flushing rate of pollutants under pipe scouring based on the pipe flow change model; collect the amount of components generated by chemical reactions in the pipe and construct a pollutant reaction model; and based on convection diffusion in the pipe, obtain the concentration change of sediments in the pipe caused by sewage and construct a convection diffusion reaction model. A coupling model is used to couple the mass scouring rate, the pollutant response model, and the convection-diffusion response model to obtain a pollutant concentration prediction coupling model. The graded control module is used to predict the pollutant concentration in the sewage pipe network according to the pollutant concentration prediction coupling model, divide the pollutant concentration into multiple levels, select different flushing methods in different levels, and control the pollutant concentration in the sewage pipe network.

[0013] The present invention provides a computer device, including a memory and a processor. The memory stores a program, and when the program is executed by the processor, the processor performs the steps of the above-described method for controlling pollutant concentration in a sewage pipe network.

[0014] The present invention provides a storage medium storing a computer program thereon, which, when executed by a processor, implements the steps of the above-described method for controlling pollutant concentration in a wastewater pipe network.

[0015] Compared with the prior art, the present invention has the following significant advantages: The wastewater pipe network pollutant concentration control method provided by this invention can obtain a predictive coupling model of pollutant concentration based on rainfall intensity by coupling a layered anti-scour model, a convection-diffusion response model, a pollutant response model, and pollutant path tracking. It directly predicts different pollutant concentration levels based on different rainfall intensities, and applies different control strategies when pollutant concentrations fall within different ranges to ensure wastewater discharge efficiency and prevent overflows due to excessive wastewater. This allows for different approaches to be taken based on different actual scenarios, thereby controlling pollutant concentrations within a reasonable range. It offers high flexibility, effectively reducing the risk of overflow pollution and preventing the formation of black and odorous water bodies, thus improving the safety and stability of the drainage system. It is widely applicable to pollution control and system regulation needs in urban combined sewer systems and combined sewer networks. Attached Figure Description

[0016] Figure 1 This is a step diagram of a sewage pipe network pollutant concentration control method according to an embodiment of this application; Figure 2 This is a schematic diagram of the structure of a sediment flushing control device according to an embodiment of this application.

[0017] In the diagram: 1. Drainage pipe; 2. Regulating pump; 3. Outflow pipe; 4. Water storage tank; 5. Sewage treatment plant. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0019] The following detailed examples illustrate the method for controlling pollutant concentrations in the wastewater pipe network and the sediment flushing and regulation device: like Figure 1 As shown, this embodiment of a method for controlling pollutant concentration in a wastewater pipe network includes: Step 1: Collect rainfall intensity data for the sewage pipe network area, construct a pipe flow rate change model based on rainfall intensity, and obtain the mass scouring rate of pollutants under pipe scouring based on the pipe flow rate change model (i.e., obtained by the stratified anti-scouring model). Collect the amount of components generated by chemical reactions in the pipe and construct a pollutant reaction model. Based on convection diffusion in the pipe, obtain the concentration change of sediments in the pipe caused by sewage and construct a convection diffusion reaction model.

[0020] Different rainfall intensities result in different pipe flow rates, which in turn affect the flushing intensity of pollutants within the pipes. Consequently, the amount of sediment produced by the flushing also varies. In other words, the concentration of pollutants in the sewage pipe network is affected by rainfall intensity.

[0021] In some embodiments, a pipeline flow variation model is constructed based on the relationship between precipitation, interception, and initial loss in rainfall intensity, with the specific expression being: ; In the formula, The pipeline flow rate (mm) is under different rainfall intensities. P Rainfall (mm); S Retention amount (mm); This is the initial loss amount. .

[0022] In other words, by collecting precipitation data in real time P Based on the amount of interception S and initial loss It can calculate the pipe flow rate under different rainfall intensities. Input pipe flow rate into the hierarchical scour resistance model It can predict the concentration changes caused by sediment erosion, which is helpful for subsequent wastewater treatment.

[0023] In practical implementation, based on the positive correlation between pipeline flow rate and rainfall shear force, the rainfall shear force is determined using the pipeline flow rate output from the pipeline flow rate change model, and then the rainfall shear force is compared with the first... i The relationship between the critical shear forces of the layers is used to obtain the mass scour rate of pollutants under pipeline scouring. A layered scour resistance model is then constructed based on this mass scour rate. Specifically: ; The pollutant response model is as follows: ; The convection-diffusion reaction model is as follows: ; In the formula, For the layered erosion resistance model, it represents the first... i Mass erosion rate of the layer (kg / s·m) 2 ); To stratify sediments; Rainfall intensity; For the first i The erosion rate constant of the layer; For rainfall shear force, ; Let be the rainfall intensity constant. The rainfall intensity per unit time is expressed using hydraulic formulas from the pipe flow rate. Obtained; For the first i The critical shear force of the layer; u The flow velocity inside the pipe during rainfall (L / s); This represents the pollutant transformation rate constant in stratified sediments; This represents the concentration of contaminants in the stratified sediments. The concentrations of different pollutants (mg / L) at a specific moment during rainfall; This is a pollutant reaction model, representing the amount of components generated due to chemical reactions; For different pollutants, the diffusion coefficient is used to describe the concentration changes of sediments following wastewater based on convection-diffusion reactions.

[0024] In some embodiments, in step 1, meteorological data is used as the input for rainfall intensity. This allows for direct prediction of pollutant concentrations in wastewater based on meteorological bureau API data (rainfall forecasts), resulting in high reliability.

[0025] Step 2: Couple the mass scouring rate, pollutant reaction model, and convection-diffusion reaction model to obtain a coupled model for predicting pollutant concentration.

[0026] Specifically, by coupling multiple factors, including but not limited to: concentration changes caused by sediment scouring, concentration changes caused by sediment following wastewater based on convection-diffusion reactions, concentration changes caused by sediment reactions, and concentration changes caused by sediment following wastewater flow, more accurate pollutant concentration prediction results can be obtained.

[0027] By coupling the mass scouring rate, the pollutant reaction model, and the convection-diffusion reaction model, an initial coupled model is obtained, the specific expression of which is: ; In some embodiments, when the influence of the diffusion coefficient is less than a threshold, the diffusion coefficient terms for different pollutants in the initial coupling model are removed, based on known concentrations. A pollutant concentration prediction coupling model is obtained, and this model is used to predict the concentrations of different pollutants in the wastewater pipe network. The specific expression is as follows: ; In the formula, For propagation speed, describe location x Over time t The change (m / s).

[0028] This pollutant concentration prediction coupling model can classify the pollutant concentration in wastewater, thereby adjusting the wastewater treatment strategy according to different levels to control the pollutant concentration within a reasonable range, ensure the best timing for strategy implementation, and avoid waste.

[0029] For example, based on the chemical reactions of fluoride F and SO4 in wastewater, the pollutant reaction model is as follows: ; ; ; in, This is a pollutant reaction model for fluoride F. Let F be the pollutant transformation rate constant for fluoride F in stratified sediments. The concentration of fluoride F, a contaminant, in the stratified sediments; For SO4 pollutant reaction models, This represents the pollutant transformation rate constant of SO4 in stratified sediments. This represents the SO4 pollutant concentration in the stratified sediments.

[0030] In this way, the concentrations of at least two pollutants in wastewater can be predicted with high accuracy, which facilitates the adjustment of subsequent wastewater treatment strategies.

[0031] In some embodiments, utilizing Conduct pollutant path tracing.

[0032] In the formula, The position (m) at a certain moment; The initial position (m); The variable is time (s). It is understandable that coupling the stratified anti-scour model, the pollutant response model, and the convection-diffusion response model can couple the concentration changes caused by sediment following the flow of sewage, and obtain more accurate pollutant concentration predictions.

[0033] Step 3: Predict the pollutant concentration in the sewage pipe network based on the pollutant concentration prediction coupling model, divide the pollutant concentration into multiple levels, select different flushing methods within different levels, and control the pollutant concentration in the sewage pipe network.

[0034] Other embodiments of this application provide a sediment flushing control device that uses the sewage network pollutant concentration control method as described in any of the above embodiments to regulate sediment flushing.

[0035] Reference Figure 2 As shown, when controlling the pollutant concentration in the sewage pipe network, the pollutant concentration in the sewage pipe network is controlled based on the sediment flushing control device. The sediment flushing control device includes a drainage pipe 1, a regulating pump 2, a discharge pipe 3, and a water storage tank 4. The regulating pump 2 is used to regulate the flow rate of sewage entering the drainage pipe 1, which can control the flushing of the pipe by rainwater and avoid excessive flushing to achieve reasonable control of the pollutant concentration. The drainage pipe 1 has an inlet and an outlet. The outlet is used to connect to the sewage treatment plant 5, and the inlet is connected to the water storage tank 4 through the discharge pipe 3. The water storage tank 4 is also connected to the sewage treatment plant 5.

[0036] Different flushing methods are selected within different levels to control the pollutant concentration in the sewage pipe network, specifically: Pollutant concentrations are classified into three levels, from low to high: Level 1, Level 2, and Level 3. When the pollutant concentration is within the Level 1 range, the flow rate of sewage through the drainage pipe is adjusted to a set threshold using regulating pump 2 to reduce the scouring of sediments in the pipe. When the pollutant concentration is within the Level 2 range, a pollutant-reducing agent is added to the sewage network. When the pollutant concentration is within the Level 3 range, the sewage is diverted to the storage tank 4 using the overflow pipe 3. It is understood that this application can select different scouring methods based on the final results of the pollutant concentration prediction coupling model, thereby avoiding problems such as excessive odor caused by excessively high pollutant concentrations after sewage passes through the pipe. Through the graded response mechanism, it can effectively suppress the sudden increase in pollutant concentration caused by rainfall, reduce the risk of overflow, and improve the stability of the pipe network system.

[0037] In other words, this application can obtain a predictive coupling model for pollutant concentration based on rainfall intensity by coupling a stratified anti-scour model, a convection-diffusion response model, a pollutant response model, and a pollutant path tracking model. Based on the different pollutant concentration levels predicted for different rainfall intensities, an appropriate scour method is selected. The pollutant concentrations are categorized into three levels from low to high: Level 1, Level 2, and Level 3. When the pollutant concentration is within Level 1, the flow rate of pump 2 can be adjusted to reduce the scour of sediments. When the pollutant concentration is within Level 2, a pollution-reducing agent can be added. When the pollutant concentration is within Level 3, some sewage can be diverted to a storage tank 4 to ensure sewage discharge efficiency and prevent overflow due to excessive sewage. This allows for different methods to be adopted according to different actual scenarios, thereby controlling the pollutant concentration within a reasonable range. It offers high flexibility, effectively reducing the risk of overflow pollution and preventing the formation of black and odorous water bodies, thus improving the safety and stability of the drainage system. It is widely applicable to pollution control and system regulation needs in urban combined sewer systems and combined sewer networks.

[0038] In some embodiments, the first level corresponds to a light rain pattern with a rainfall speed between 0.1 m / s and 0.3 m / s and a small amount of rainfall; the second level corresponds to a moderate rain pattern with a rainfall speed between 0.3 m / s and 0.5 m / s and a moderate amount of rainfall; and the third level corresponds to a heavy rain pattern with a rainfall speed greater than 0.5 m / s and a large amount of rainfall.

[0039] In other words, under light rain mode, rainwater has a low flushing effect on the sewage pipe network after flowing through it, and the pollutant concentration is within a reasonable range. Under moderate rain mode, the pollutant concentration can also be controlled within a reasonable range through the application of chemicals. Under heavy rain mode, rainwater is directly diverted to the storage tank 4 through the discharge pipe 3, which will not cause excessive flushing of the pipes. This can avoid instantaneous overload of the sewage treatment plant 5 and also avoid the generation of black and odorous water bodies, thus ensuring the living environment of residents.

[0040] In other words, under heavy rain mode, when the pollutant concentration is within the third level range, the sewage is diverted to the storage tank 4 through the discharge pipe 3. The storage tank 4 is used to buffer the rainwater first, and then it is slowly released into the sewage treatment plant 5. This can avoid instantaneous overload of the sewage treatment plant 5 and improve the safety and stability of the drainage system.

[0041] In some embodiments, the sediment flushing control device further includes a flow sensor located inside the drainage pipe 1. The flow sensor can directly detect changes in flow within the drainage pipe 1, thereby establishing a pipe flow change model under the combined effect of rainfall intensity and the flow sensor, which can improve accuracy and reliability.

[0042] In some embodiments, the sediment flushing control device further includes a water quality sensor, which is installed in the drainage pipe 1 and can detect the water quality of the sewage flowing through the sewage pipe network in real time. This allows the device to detect the operating status of the sediment flushing control device and flexibly adjust the flushing intensity to avoid over- or under-treatment.

[0043] An adaptive valve control system can also be installed on drainage pipeline 1. By integrating flow sensors, water quality sensors and adaptive valve control system, it can identify pollutant peaks in time at the beginning of rainfall and activate sediment flushing control device for graded response. It can effectively reduce the risk of overflow pollution and improve the safety and stability of drainage system. It is widely applicable to pollution control and system regulation needs in urban combined sewer systems and stormwater and sewage mixed sewer networks.

[0044] This invention proposes a pollutant concentration control system for wastewater pipe networks, comprising: The modeling module is used to collect rainfall intensity in the sewage pipe network area, construct a pipe flow change model based on rainfall intensity, and obtain the mass flushing rate of pollutants under pipe scouring based on the pipe flow change model; collect the amount of components generated by chemical reactions in the pipe and construct a pollutant reaction model; based on convection diffusion in the pipe, obtain the concentration change of sediments in the pipe caused by sewage and construct a convection diffusion reaction model; the coupling model is used to couple the mass flushing rate, pollutant reaction model and convection diffusion reaction model to obtain a pollutant concentration prediction coupling model; the hierarchical control module is used to predict the pollutant concentration in the sewage pipe network according to the pollutant concentration prediction coupling model, divide the pollutant concentration into multiple levels, select different flushing methods in different levels, and control the pollutant concentration in the sewage pipe network.

[0045] The present invention also provides a computer device, including a memory and a processor, wherein the memory stores a program, and when the program is executed by the processor, the processor performs the steps of a method for controlling pollutant concentration in a sewage pipe network.

[0046] According to the disclosed embodiments, the computer device can communicate with one or more external devices (e.g., keyboard, pointing device, Bluetooth communication, etc.) or with any device that enables the computing device to communicate with one or more other computing devices (e.g., router, demodulator, etc.).

[0047] The present invention also provides a storage medium storing a computer program thereon, characterized in that the computer program, when executed by a processor, implements the steps of a method for controlling pollutant concentration in a sewage pipe network.

[0048] According to the disclosed embodiments, the storage medium can be a non-volatile computer-readable storage medium, such as, but not limited to: portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof. In this invention, the storage medium can be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, apparatus, or device.

[0049] The above description, in conjunction with specific preferred embodiments, provides a more detailed explanation of the present invention. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such deductions or substitutions should be considered to fall within the scope of protection of the present invention.

Claims

1. A method of sewer network pollutant concentration control, characterized in that, Includes the following steps: The rainfall intensity in the sewage pipe network area is obtained, and a pipe flow change model is constructed based on the rainfall intensity. The mass scouring rate of pollutants under pipe scouring is obtained based on the pipe flow change model. The amount of components generated by chemical reactions in the pipe is collected, and a pollutant reaction model is constructed. Based on the convection diffusion in the pipe, the concentration change of sediments in the pipe caused by sewage is obtained, and a convection diffusion reaction model is constructed. By coupling the mass scouring rate, the pollutant reaction model, and the convection-diffusion reaction model, a coupled model for predicting pollutant concentration is obtained. The pollutant concentration in the sewage pipe network is predicted based on the pollutant concentration prediction coupling model, and the pollutant concentration is divided into multiple levels. Different flushing methods are selected within different levels to control the pollutant concentration in the sewage pipe network.

2. The method for controlling pollutant concentration in a sewage pipe network as described in claim 1, characterized in that, A pipeline flow variation model is constructed based on the relationship between precipitation, interception, and initial loss in rainfall intensity. The specific expression is as follows: ； wherein, is the pipe flow for different rainfall intensities; P is the precipitation; S is the interception; is the initial loss, .

3. A sewer network pollutant concentration control method according to claim 2, characterised in that, The mass scouring rate of pollutants under pipeline scouring is obtained based on the pipeline flow change model; the amount of components generated by chemical reactions within the pipeline is collected to construct a pollutant reaction model; based on convection diffusion in the pipeline, the concentration change of sediments in the pipeline caused by sewage flow is obtained to construct a convection diffusion reaction model, specifically: Based on the positive correlation between the pipeline flow and the rainfall shear force, the pipeline flow determined by the pipeline flow change model is used to determine the rainfall shear force, and based on the relationship between the rainfall shear force and the critical shear force of the layer, the mass scouring rate of the pollutant under the pipeline scouring is obtained. i The layered anti-scouring model is constructed based on the mass scouring rate, specifically: ； The pollutant reaction model is as follows: ； The convective-diffusion reaction model is as follows: ； in, Indicates the first i The mass erosion rate of the layer; To stratify sediments; Rainfall intensity; For the first i The erosion rate constant of the layer; For rainfall shear force, ; Let be the rainfall intensity constant. The rainfall intensity per unit time is expressed using hydraulic formulas from the pipe flow rate. Obtained; For the first i The critical shear force of the layer; u is the flow velocity inside the pipe during rainfall; This represents the pollutant transformation rate constant in stratified sediments; This represents the concentration of contaminants in the stratified sediments. The concentrations of different pollutants at a specific moment during rainfall; Indicates the amount of components produced due to a chemical reaction; denoted as the diffusion coefficient for different pollutants.

4. The method for controlling pollutant concentration in a sewage pipe network as described in claim 3, characterized in that, By coupling the mass scouring rate, the pollutant reaction model, and the convection-diffusion reaction model, a coupled model for predicting pollutant concentration is obtained, specifically: By coupling the mass scouring rate, the pollutant reaction model, and the convection-diffusion reaction model, an initial coupled model is obtained, the specific expression of which is: ； When the influence of the diffusion coefficient is less than a threshold, the diffusion coefficient terms for different pollutants in the initial coupling model are removed, based on known concentrations. A pollutant concentration prediction coupling model is obtained, and the concentrations of different pollutants in the wastewater pipe network are predicted using the pollutant concentration prediction coupling model. The specific expression is as follows: ； in, For propagation speed, describe location x Over time t The changes.

5. The method for controlling pollutant concentration in a sewage pipe network as described in claim 1, characterized in that, When controlling the pollutant concentration in the sewage pipe network, the pollutant concentration in the sewage pipe network is controlled based on a sediment flushing control device, which includes a drainage pipe, a regulating pump, a discharge pipe, and a water storage tank.

6. The method for controlling pollutant concentration in a sewage pipe network as described in claim 5, characterized in that, The method of selecting different flushing methods at different levels to control the pollutant concentration in the sewage pipe network specifically includes: When the pollutant concentration is within the first level range, the flow rate of sewage through the drainage pipeline is adjusted to a set threshold using a regulating pump. When the pollutant concentration is within the second level range, add a pollutant-reducing agent into the sewage pipe network; When the pollutant concentration is within the range of the third level, the sewage is diverted to the storage tank using the discharge pipe; The first, second, and third levels are classified according to the pollutant concentration from low to high.

7. The method for controlling pollutant concentration in a sewage pipe network as described in claim 6, characterized in that, The first level corresponds to a rainfall speed between 0.1 m / s and 0.3 m / s, the second level corresponds to a rainfall speed between 0.3 m / s and 0.5 m / s, and the third level corresponds to a rainfall speed greater than 0.5 m / s.

8. A sewage pipe network pollutant concentration control system, characterized in that, include: The modeling module is used to obtain the rainfall intensity in the sewage pipe network area, construct a pipe flow change model based on the rainfall intensity, and obtain the mass scouring rate of pollutants under pipe flushing based on the pipe flow change model; collect the amount of components generated by chemical reactions in the pipe and construct a pollutant reaction model; and based on the convection diffusion in the pipe, obtain the concentration change of sediments in the pipe caused by sewage and construct a convection diffusion reaction model. A coupling model is used to couple the mass scouring rate, the pollutant response model, and the convection-diffusion response model to obtain a pollutant concentration prediction coupling model. The graded control module is used to predict the pollutant concentration in the sewage pipe network according to the pollutant concentration prediction coupling model, divide the pollutant concentration into multiple levels, select different flushing methods in different levels, and control the pollutant concentration in the sewage pipe network.

9. A computer device, characterized in that, The device includes a memory and a processor, wherein the memory stores a program that, when executed by the processor, causes the processor to perform the steps of a wastewater network pollutant concentration control method as described in any one of claims 1 to 7.

10. A storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps of the sewage pipe network pollutant concentration control method according to any one of claims 1 to 7.

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