A method and system for monitoring and early warning of industrial wastewater treatment and discharge

Abstract

This invention relates to the field of wastewater treatment technology, and in particular to a method and system for monitoring and early warning of industrial wastewater discharge. The system acquires a first and a second forward flow rate value using sensors and calculates the flow difference. When the flow difference exceeds a preset first backflow determination threshold, a first-level early warning is triggered, and a pipeline pressure sensor group is activated to detect pressure and obtain pressure data at key pipeline points. Based on the pressure data at the key pipeline points, a pressure deviation is obtained using a pipeline pressure model. When the pressure deviation exceeds a preset second backflow determination threshold, a second-level early warning is triggered, and a backflow zone pipeline code is fed back. A backflow velocity coefficient is obtained based on the pressure deviation and the flow difference. The valve opening is adjusted based on the backflow velocity coefficient and the backflow zone pipeline code, thereby achieving early warning and control of wastewater backflow during wastewater discharge.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a method and system for monitoring and early warning of industrial wastewater treatment and discharge. Background Technology

[0002] In the process of industrial wastewater discharge, factors such as abnormal wastewater flow, valve malfunction, and pipeline blockage often lead to wastewater backflow. Wastewater backflow not only causes secondary pollution due to the return of treated wastewater, but it can also seriously affect the normal operation of wastewater treatment facilities, thereby increasing maintenance costs and reducing wastewater treatment efficiency. Currently, the monitoring and treatment of wastewater backflow mainly rely on traditional manual experience and simple valve adjustment methods. These methods lack efficient monitoring and intelligent early warning mechanisms, making it impossible to detect backflow in the pipeline in a timely and accurate manner, resulting in a failure to provide timely early warning and precise control of wastewater backflow. Therefore, how to more efficiently and accurately monitor and provide early warning of wastewater backflow has become an urgent problem to be solved. Summary of the Invention

[0003] This invention provides a method and system for monitoring and early warning of industrial wastewater treatment and discharge, in order to solve the problem of not being able to provide timely early warning and control of wastewater backflow during the wastewater discharge process.

[0004] To achieve the above objectives, in one aspect, the present invention provides a method for monitoring and early warning of industrial wastewater treatment and discharge, the method comprising:

[0005] The first positive flow value is obtained from the flow sensor at the front end of the wastewater discharge pipeline, and the second positive flow value is obtained from the flow sensor at the rear end of the wastewater discharge pipeline. The flow difference is calculated based on the first positive flow value and the second positive flow value.

[0006] When the flow difference exceeds the preset first backflow judgment threshold, a first-level warning is triggered and the pipeline pressure sensor group is activated to detect pressure and obtain pressure data at key points in the pipeline. Based on the pressure data at key points in the pipeline, the pressure deviation is obtained through the pipeline pressure model.

[0007] When the pressure deviation exceeds the preset second backflow judgment threshold, a secondary early warning is triggered and the backflow zone pipeline code is fed back. The backflow flow coefficient is obtained based on the pressure deviation and the flow rate difference. The valve opening is adjusted based on the backflow flow coefficient and the backflow zone pipeline code.

[0008] Furthermore, the method for obtaining pressure data at key points of the pipeline by activating the pipeline pressure sensor group to detect pressure, and obtaining the pressure deviation based on the pipeline pressure model using the key point pressure data, includes:

[0009] The pressure sensors installed at preset key points on the wastewater discharge pipeline are activated to detect pressure and obtain pressure data at the key points of the pipeline.

[0010] Obtain wastewater density, wastewater flow velocity, and basic pipeline parameters, including pipeline length and inner diameter at key points. Based on the pressure data at these key points, calculate the pressure deviation σ using a pipeline pressure model. i for:

[0011]

[0012] Where P i Here, P0 is the pressure data at the i-th critical point of the pipeline, λ is the friction coefficient, D is the inner diameter of the pipeline, and L is the pressure data at the pipeline inlet. j ρ is the length of the j-th pipe segment, ρ is the density of the wastewater, and v j σ is the wastewater flow velocity in the j-th pipeline segment. i It is the pressure deviation of the i-th pipe segment.

[0013] Furthermore, the method of triggering a secondary early warning and feeding back the backflow zone pipeline code when the pressure deviation exceeds a preset second backflow determination threshold, obtaining the backflow flow coefficient based on the pressure deviation and flow rate difference, and adjusting the valve opening based on the backflow flow coefficient and the backflow zone pipeline code includes:

[0014] When the pressure deviation exceeds the preset second backflow determination threshold, a secondary early warning is triggered, and the backflow zone pipeline code is obtained through the axial pressure gradient positioning method.

[0015] The reverse flow coefficient is obtained based on the pressure deviation and the flow difference. for:

[0016]

[0017] Where σ i ΔQ is the pressure deviation of the i-th pipe segment, and ΔQ is the flow rate difference. f It is the first positive flow value. It is the reverse flow coefficient of the i-th pipe segment.

[0018] Adjust the valve opening based on the backflow coefficient and the backflow zone pipeline code.

[0019] Furthermore, the method for obtaining the reverse flow zone pipe code through the axial pressure gradient positioning method includes:

[0020] Obtain pressure data at key points in the pipeline and calculate the pressure gradient T of the pipeline segment. i for:

[0021]

[0022] Where P i P is the pressure value detected by the i-th pressure sensor.i―1 L is the pressure value detected by the (i-1)th pressure sensor. i T is the length of the i-th pipe segment. i It is the pipe segment pressure gradient of the i-th pipe segment.

[0023] Pressure mutation points are obtained by using the mutation point determination rules based on the pressure gradient of each pipeline segment, and the code of the pipeline corresponding to the pressure mutation point is used as the pipeline code of the reverse flow zone.

[0024] Furthermore, the method of obtaining pressure abrupt change points based on the pressure gradient of each pipeline segment using abrupt change point determination rules, and using the code of the pipeline corresponding to the pressure abrupt change point as the pipeline code for the reverse flow zone includes:

[0025] The intensity δ of the pressure gradient change between adjacent pipe sections is calculated based on the pressure gradient of each pipe section:

[0026] δ i =|T i+1 ―T i |

[0027] Where T i+1 δ is the pipe segment pressure gradient of the (i+1)th pipe segment. i It is the intensity of the pressure gradient change from the i-th pipe segment to the (i+1)-th pipe segment.

[0028] The determination is based on the intensity of pressure gradient changes in each pipeline section as follows:

[0029] when and If the pressure change point is found in the i-th pipeline segment, then it is determined that there is a pressure change point.

[0030] when and If the pressure change point is found in the (i+1)th segment of the pipeline, then it is determined that there is a pressure change point.

[0031] Where δ i―1 δ is the intensity of the pressure gradient change from the (i-1)th pipe segment to the ith pipe segment, k is the sensitivity coefficient, N is the total number of pipe segments, and δ max It is the maximum value of the pressure gradient change intensity across all pipeline sections.

[0032] Pipe sections with pressure abrupt changes are coded and marked as reverse flow zone pipe codes.

[0033] Furthermore, the method for adjusting the valve opening based on the backflow velocity coefficient and the backflow zone pipeline code includes:

[0034] Based on the pipeline code of the reflux zone, the preset pipeline connection relationship database is used to obtain the regulating valve associated with the pipeline segment of the reflux zone as the target valve.

[0035] Pipe sections in the reverse flow zone whose target valves are the same are grouped into the same valve group. The corrected opening of the target valve for each pipe section in the same valve group is obtained based on the reverse flow coefficient of each reverse flow zone pipe section in the same valve group. for:

[0036]

[0037] in The initial opening degree of the target valve in the j-th valve group is m. j It is the total number of pipe segments marked with the backflow zone pipe code within valve group j. It is the target valve correction opening of the j-th valve group.

[0038] Adjust the valve opening according to the target valve correction opening.

[0039] Furthermore, before adjusting the valve opening according to the target valve correction opening, the method further includes:

[0040] Set the minimum safe opening of the valve, compare the target valve correction opening with the minimum safe opening of the valve, and when the target valve correction opening is less than the minimum safe opening, adjust the valve opening according to the minimum safe opening.

[0041] A level 3 warning is triggered when the valve opening is adjusted to the minimum safe opening degree.

[0042] Based on the same inventive concept, this invention provides an industrial wastewater treatment and discharge monitoring and early warning system, the system comprising: a flow monitoring module, a pressure deviation analysis module, and a backflow control module, wherein the modules are connected in sequence.

[0043] The flow monitoring module is used to obtain a first positive flow value from the flow sensor at the front end of the wastewater discharge pipeline, obtain a second positive flow value from the flow sensor at the rear end of the wastewater discharge pipeline, and calculate the flow difference based on the first positive flow value and the second positive flow value.

[0044] The pressure deviation analysis module is used to trigger a first-level early warning and start the pipeline pressure sensor group to detect pressure data at key points of the pipeline when the flow difference is greater than the preset first backflow judgment threshold. Based on the pressure data at key points of the pipeline, the pressure deviation is obtained through the pipeline pressure model.

[0045] The backflow control module is used to trigger a secondary warning and provide feedback on the backflow zone pipeline code when the pressure deviation is greater than the preset second backflow judgment threshold. It obtains the backflow flow coefficient based on the pressure deviation and the flow rate difference, and adjusts the valve opening based on the backflow flow coefficient and the backflow zone pipeline code.

[0046] Compared with the prior art, the beneficial effects of this invention are: to achieve early warning of backflow through real-time differential monitoring, to achieve precise location of abrupt change points through axial pressure gradient positioning method, to construct backflow flux coefficient through pressure deviation analysis and further combine the nonlinear compression characteristics of hyperbolic tangent function to achieve adaptive smooth adjustment of valve opening, thereby achieving accurate early warning and control of backflow problems in wastewater discharge as a whole. Attached Figure Description

[0047] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0048] Figure 1 This is a flowchart of an industrial wastewater treatment and discharge monitoring and early warning method according to Embodiment 1 of the present invention;

[0049] Figure 2 This is a schematic diagram of the module composition of an industrial wastewater treatment and discharge monitoring and early warning system according to Embodiment 2 of the present invention. Detailed Implementation

[0050] 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 embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0051] Example 1: As Figure 1 As shown in the figure, this embodiment provides a method for monitoring and early warning of industrial wastewater treatment and discharge, the method comprising:

[0052] S1. Obtain the first positive flow value from the flow sensor at the front end of the wastewater discharge pipe, obtain the second positive flow value from the flow sensor at the rear end of the wastewater discharge pipe, and calculate the flow difference based on the first and second positive flow values.

[0053] It should be noted that the formula for calculating the flow difference based on the first and second positive flow values ​​is as follows:

[0054] ΔQ=Q f —Q b .

[0055] Q f It is the first positive flow value, Q bIt is the second positive flow value, and ΔQ is the flow difference.

[0056] For example, if during wastewater discharge, the first positive flow rate value obtained by the flow sensor at the front end of the pipeline is 150 cubic meters per hour, and the second positive flow rate value obtained by the flow sensor at the rear end is 135 cubic meters per hour, then according to the method for calculating the flow difference, the flow difference is: ΔQ = Q f —Q b =150 - 135 = 15 cubic meters / hour.

[0057] By calculating the flow difference, abnormal fluctuations in flow can be quickly detected, reflecting abnormal flow in wastewater pipelines in a timely manner, and providing support for further detailed analysis and processing.

[0058] S2. When the flow difference is greater than the preset first backflow judgment threshold, a first-level warning is triggered and the pipeline pressure sensor group is started to detect the pressure and obtain the pressure data of the key points of the pipeline. The pressure deviation is obtained by using the pipeline pressure model based on the pressure data of the key points of the pipeline.

[0059] Calculating the flow difference between the upstream and downstream sides can provide a preliminary indication of backflow. A significant flow difference can trigger a Level 1 warning. For example, if the flow difference is 15 cubic meters per hour and the preset first backflow threshold is 10 cubic meters per hour, a Level 1 warning is triggered because the flow difference exceeds the threshold, initiating pressure detection by the pipeline pressure sensor array. However, relying solely on the flow difference can lead to misjudgments. The flow difference between the upstream and downstream sides cannot directly and accurately reflect backflow within the pipeline. When backflow occurs, the flow direction and pressure distribution of the wastewater change, and pressure deviation provides supplementation and correction for the flow difference.

[0060] S3. When the pressure deviation exceeds the preset second backflow judgment threshold, a secondary early warning is triggered and the backflow zone pipeline code is fed back. The backflow flow coefficient is obtained based on the pressure deviation and the flow rate difference. The valve opening is adjusted based on the backflow flow coefficient and the backflow zone pipeline code. Pressure deviation allows for more accurate identification of abnormal changes within the pipeline. For example, in some cases, the flow rate fluctuations at the upstream and downstream ends may be small, but the internal pressure changes drastically. Relying solely on the flow rate difference may easily lead to missed detections. Therefore, it is necessary to further analyze the backflow by combining the flow rate difference and the pressure deviation, thereby executing control strategies more accurately.

[0061] It should be noted that the method for obtaining pressure data at key points of the pipeline by activating the pipeline pressure sensor group and then using the pipeline pressure model to obtain the pressure deviation based on the key point pressure data includes:

[0062] The pressure sensors installed at preset key points on the wastewater discharge pipeline are activated to detect pressure and obtain pressure data at the key points of the pipeline; the preset key points are, for example, the inlet, outlet, and branch points of the pipeline.

[0063] Obtain wastewater density, wastewater flow velocity, and basic pipeline parameters, including pipeline length and inner diameter at key points. Based on the pressure data at these key points, calculate the pressure deviation σ using a pipeline pressure model. i for:

[0064]

[0065] Where P i Here, P0 is the pressure data at the i-th critical point of the pipeline, λ is the friction coefficient, D is the inner diameter of the pipeline, and L is the pressure data at the pipeline inlet. j ρ is the length of the j-th pipe segment, ρ is the density of the wastewater, and v j σ is the wastewater flow velocity in the j-th pipeline segment. i It is the pressure deviation of the i-th pipe segment.

[0066] The wastewater density can be obtained using a densitometer or through periodic sampling experiments. The wastewater flow velocity can be obtained using a flow meter. The friction coefficient can be obtained by consulting a table of parameters corresponding to pipe material and friction coefficient. For example, the λ value is 0.02 for PVC pipe and 0.03 for steel pipe.

[0067] For example: the pressure at the pipe inlet is 400 kPa, the pressure at the first critical point is 370 kPa, the pressure at the second critical point is 386 kPa, and the pressure at the third critical point is 327 kPa. The length of the pipe section between the inlet and the first critical point is 80 m, the length of the pipe section between the first and second critical points is 120 m, and the length of the pipe section between the second and third critical points is 100 m. The wastewater density is 1000 kg / m³. 3 The pipe has an inner diameter of 0.15m and a friction coefficient of 0.03. The wastewater flow velocity in the first pipe section is 1.2m / s, in the second pipe section it is 1.8m / s, and in the third pipe section it is 0.9m / s. What is the pressure deviation of the first pipe section? Pressure deviation of the second pipeline section Similarly, the pressure deviation of the third pipeline section σ3 can be obtained as 4.43%.

[0068] It should be noted that the method of triggering a secondary early warning and feeding back the backflow zone pipeline code when the pressure deviation exceeds the preset second backflow judgment threshold, obtaining the backflow flow coefficient based on the pressure deviation and flow rate difference, and adjusting the valve opening based on the backflow flow coefficient and the backflow zone pipeline code includes:

[0069] When the pressure deviation exceeds the preset second backflow determination threshold, a secondary early warning is triggered, and the backflow zone pipeline code is obtained through the axial pressure gradient positioning method.

[0070] The reverse flow coefficient is obtained based on the pressure deviation and the flow difference. for:

[0071]

[0072] Where σ i ΔQ is the pressure deviation of the i-th pipe segment, and ΔQ is the flow rate difference. f It is the first positive flow value. It is the reverse flow coefficient of the i-th pipe segment.

[0073] For example, when the pressure deviation of each pipeline section is σ1 = 4.99%, σ2 = 9.43%, and σ3 = 4.43%, the corresponding reverse flow coefficient can be calculated.

[0074] Adjust the valve opening based on the backflow coefficient and the backflow zone pipeline code.

[0075] It should be noted that the method for obtaining the pipeline code of the reverse flow zone through the axial pressure gradient positioning method includes:

[0076] Obtain pressure data at key points in the pipeline and calculate the pressure gradient T of the pipeline segment. i for:

[0077]

[0078] Where P i P is the pressure value detected by the i-th pressure sensor. i―1 L is the pressure value detected by the (i-1)th pressure sensor. i T is the length of the i-th pipe segment. i It is the pipe segment pressure gradient of the i-th pipe segment.

[0079] The i-th pipe segment refers to the pipe segment formed between the i-th pressure sensor and the (i+1)-th pressure sensor.

[0080] For example: when the pressure at the pipe inlet is 400 kPa, the pressure at the first critical point is 370 kPa, the pressure at the second critical point is 386 kPa, and the pressure at the third critical point is 327 kPa, the pipe segment length between the inlet and the first critical point is 80 m, the pipe segment length between the first and second critical points is 120 m, and the pipe segment length between the second and third critical points is 100 m, what is the pipe segment pressure gradient of the first pipe segment? Pipeline pressure gradient in section 2 Pipeline pressure gradient in segment 3

[0081] Pressure mutation points are obtained by using the mutation point determination rules based on the pressure gradient of each pipeline segment, and the code of the pipeline corresponding to the pressure mutation point is used as the pipeline code of the reverse flow zone.

[0082] It should be noted that the method of obtaining pressure abrupt change points based on the pressure gradient of each pipeline segment using abrupt change point determination rules, and using the code of the pipeline corresponding to the pressure abrupt change point as the pipeline code for the reverse flow zone includes:

[0083] The intensity δ of the pressure gradient change between adjacent pipe sections is calculated based on the pressure gradient of each pipe section:

[0084] δ i =|T i+1 ―T i |

[0085] Where T i+1 δ is the pipe segment pressure gradient of the (i+1)th pipe segment. i It is the intensity of the pressure gradient change from the i-th pipe segment to the (i+1)-th pipe segment.

[0086] The determination is based on the intensity of pressure gradient changes in each pipeline section as follows:

[0087] when and If the pressure change point is found in the i-th pipeline segment, then it is determined that there is a pressure change point.

[0088] when and If the pressure change point is found in the (i+1)th segment of the pipeline, then it is determined that there is a pressure change point.

[0089] Where δ i―1 δ is the intensity of the pressure gradient change from the (i-1)th pipe segment to the ith pipe segment, k is the sensitivity coefficient, N is the total number of pipe segments, and δ max It is the maximum value of the pressure gradient change intensity across all pipeline sections.

[0090] The sensitivity coefficient k is used to adjust the sensitivity of mutation determination. According to historical experimental data, setting k to 1.3 can effectively determine and identify pressure mutation points.

[0091] For example: the pressure gradient change intensity from the first pipeline segment to the second pipeline segment δ1=|T i+1 ―T i The pressure gradient change intensity δ2 from the 2nd to the 3rd pipe segment is calculated as |=|0.13―(―0.38)|=0.51. If the pipeline has a total of 10 segments, the pressure gradient change intensity of each adjacent segment can be calculated similarly. Assuming the pressure gradient change intensities δ1 to δ9 of adjacent segments from the 1st to the 10th pipe segment are 0.51, 0.72, 0.22, 0.16, 0.11, 0.45, 0.32, 0.13, and 0.19 respectively, then averaging after removing the maximum value yields... Since δ2 = 0.72 > 0.34 and δ1 = 0.51 > 0.34, it is determined that there is a pressure abrupt change point in the second pipeline segment. This is because the abrupt change point in the second pipeline segment leads to a sharp change in the pressure gradient from the first to the second pipeline segment and from the second to the third pipeline segment. Since δ6 = 0.45 > 0.34 and δ5 = 0.11 ≤ 0.34, it is determined that there is a pressure abrupt change point in the seventh pipeline segment. This is because the abrupt change point in the seventh pipeline segment leads to a sharp change in the pressure gradient from the sixth to the seventh pipeline segment, but not the sixth segment. Therefore, the pipeline codes for the backflow zone are 2 and 7.

[0092] Pipe sections with pressure abrupt changes are coded and marked as reverse flow zone pipe codes.

[0093] It should be noted that the method for adjusting the valve opening based on the backflow coefficient and the backflow zone pipeline code includes:

[0094] Based on the pipeline code of the reflux zone, the preset pipeline connection relationship database is used to obtain the regulating valve associated with the pipeline segment of the reflux zone as the target valve.

[0095] Pipe sections in the reverse flow zone whose target valves are the same are grouped into the same valve group. The corrected opening of the target valve for each pipe section in the same valve group is obtained based on the reverse flow coefficient of each reverse flow zone pipe section in the same valve group. for:

[0096]

[0097] in The initial opening degree of the target valve in the j-th valve group is m. jIt is the total number of pipe segments marked with the backflow zone pipe code within valve group j. It is the target valve correction opening of the j-th valve group.

[0098] Adjust the valve opening according to the target valve correction opening.

[0099] For example: Based on the backflow zone pipe code, a preset pipe connection relationship database is queried to obtain the regulating valves associated with the second and seventh pipe segments as target valves. Since the previous steps have already exemplified the calculation of the backflow coefficient for the second pipe segment... Similarly, the reverse flow coefficient of the 7th pipe segment can be obtained. Let's assume it is... If both are associated with the same target valve, then pipe sections 2 and 7 are classified as the same valve group. If the initial opening setting of the target valve in this valve group is 90%, then the corrected opening of the target valve can be calculated. The target valve opening is adjusted to 86.94%. By appropriately closing the valve, the water flow is reduced, which slows down the backflow and restores the normal state.

[0100] It should be noted that, before adjusting the valve opening according to the target valve correction opening, the method further includes:

[0101] Set the minimum safe opening of the valve, compare the target valve correction opening with the minimum safe opening of the valve, and when the target valve correction opening is less than the minimum safe opening, adjust the valve opening according to the minimum safe opening.

[0102] A level 3 warning is triggered when the valve opening is adjusted to the minimum safe opening degree.

[0103] By setting a minimum safe valve opening, it can be ensured that the valve regulation process is always kept within a safe range, avoiding processing interruptions and equipment damage due to excessively small openings.

[0104] Example 2: Based on the same inventive concept, such as Figure 2 As shown in the figure, this embodiment provides an industrial wastewater treatment and discharge monitoring and early warning system. The system includes: a flow monitoring module, a pressure deviation analysis module, and a backflow control module, which are connected in sequence.

[0105] The flow monitoring module is used to obtain a first positive flow value from the flow sensor at the front end of the wastewater discharge pipeline, obtain a second positive flow value from the flow sensor at the rear end of the wastewater discharge pipeline, and calculate the flow difference based on the first positive flow value and the second positive flow value.

[0106] The pressure deviation analysis module is used to trigger a first-level early warning and start the pipeline pressure sensor group to detect pressure data at key points of the pipeline when the flow difference is greater than the preset first backflow judgment threshold. Based on the pressure data at key points of the pipeline, the pressure deviation is obtained through the pipeline pressure model.

[0107] The backflow control module is used to trigger a secondary warning and provide feedback on the backflow zone pipeline code when the pressure deviation is greater than the preset second backflow judgment threshold. It obtains the backflow flow coefficient based on the pressure deviation and the flow rate difference, and adjusts the valve opening based on the backflow flow coefficient and the backflow zone pipeline code.

[0108] It should be noted that the specific methods by which each module performs operations in the system described in the above embodiments have been described in detail in Embodiment 1 of the method, and will not be elaborated here.

[0109] Finally, it should be noted that although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for monitoring and early warning of industrial wastewater treatment and discharge, characterized in that, The method includes: The first positive flow value is obtained from the flow sensor at the front end of the wastewater discharge pipeline, and the second positive flow value is obtained from the flow sensor at the rear end of the wastewater discharge pipeline. The flow difference is calculated based on the first positive flow value and the second positive flow value. When the flow difference is greater than the preset first backflow judgment threshold, a first-level early warning is triggered and the pipeline pressure sensor group is started to detect pressure and obtain pressure data of key points in the pipeline. The pressure deviation is obtained by the pipeline pressure model based on the pressure data of key points in the pipeline. When the pressure deviation exceeds the preset second backflow judgment threshold, a secondary early warning is triggered and the backflow zone pipeline code is fed back. The backflow flow coefficient is obtained based on the pressure deviation and the flow rate difference. The valve opening is adjusted based on the backflow flow coefficient and the backflow zone pipeline code.

2. The industrial wastewater treatment and discharge monitoring and early warning method according to claim 1, characterized in that, The method for obtaining pressure data at key points of the pipeline by activating the pipeline pressure sensor group to detect pressure, and then obtaining the pressure deviation based on the pipeline pressure model using the key point pressure data, includes: The pressure sensors installed at preset key points on the wastewater discharge pipeline are activated to detect pressure and obtain pressure data at the key points of the pipeline. Obtain wastewater density, wastewater flow velocity, and basic pipeline parameters, including pipeline length and inner diameter at key points. Based on the pressure data at these key points, calculate the pressure deviation σ using a pipeline pressure model. i for: Where P i Here, P0 is the pressure data at the i-th critical point of the pipeline, λ is the friction coefficient, D is the inner diameter of the pipeline, and L is the pressure data at the pipeline inlet. j ρ is the length of the j-th pipe segment, ρ is the density of the wastewater, and v j σ is the wastewater flow velocity in the j-th pipeline segment. i It is the pressure deviation of the i-th pipe segment.

3. The industrial wastewater treatment and discharge monitoring and early warning method according to claim 1, characterized in that, The method of triggering a secondary early warning and feeding back the backflow zone pipeline code when the pressure deviation exceeds a preset second backflow determination threshold, obtaining the backflow flow coefficient based on the pressure deviation and flow rate difference, and adjusting the valve opening based on the backflow flow coefficient and the backflow zone pipeline code includes: When the pressure deviation exceeds the preset second backflow determination threshold, a secondary early warning is triggered and the backflow zone pipeline code is obtained through the axial pressure gradient positioning method. The reverse flow coefficient is obtained based on the pressure deviation and the flow difference. for: Where σ i ΔQ is the pressure deviation of the i-th pipe segment, and ΔQ is the flow rate difference. f It is the first positive flow value. It is the reverse flow coefficient of the i-th pipe segment; Adjust the valve opening based on the backflow coefficient and the backflow zone pipeline code.

4. The industrial wastewater treatment and discharge monitoring and early warning method according to claim 3, characterized in that, The method for obtaining the pipeline coding of the reverse flow zone through the axial pressure gradient positioning method includes: Obtain pressure data at key points in the pipeline and calculate the pressure gradient T of the pipeline segment. i for: Where P i P is the pressure value detected by the i-th pressure sensor. i―1 L is the pressure value detected by the (i-1)th pressure sensor. i T is the length of the i-th pipe segment. i It is the pipe segment pressure gradient of the i-th pipe segment; Pressure mutation points are obtained based on the pressure gradient of each pipeline segment and the mutation point determination rules. The code of the pipeline corresponding to the pressure mutation point is used as the pipeline code of the reverse flow zone.

5. The industrial wastewater treatment and discharge monitoring and early warning method according to claim 4, characterized in that, The method of obtaining pressure abrupt change points based on the pressure gradient of each pipeline segment using abrupt change point determination rules, and using the code of the pipeline corresponding to the pressure abrupt change point as the pipeline code for the reverse flow zone includes: The intensity δ of the pressure gradient change between adjacent pipe sections is calculated based on the pressure gradient of each pipe section: δ i =|T i+1 ―T i |; Where T i+1 δ is the pipe segment pressure gradient of the (i+1)th pipe segment. i It is the intensity of the pressure gradient change from the i-th pipe segment to the (i+1)-th pipe segment; The determination is based on the intensity of pressure gradient changes in each pipeline section as follows: when and If the pressure change point occurs, then it is determined that there is a pressure change point in the i-th pipeline segment; when and If the pressure change point is found in the (i+1)th segment of the pipeline, then it is determined that there is a pressure change point. Where δ i―1 δ is the intensity of the pressure gradient change from the (i-1)th pipe segment to the ith pipe segment, k is the sensitivity coefficient, N is the total number of pipe segments, and δ max It is the maximum value of the pressure gradient change intensity across all pipeline sections; Pipe sections with pressure abrupt changes are coded and marked as reverse flow zone pipe codes.

6. The industrial wastewater treatment and discharge monitoring and early warning method according to claim 3, characterized in that, The method for adjusting the valve opening based on the backflow coefficient and the backflow zone pipeline code includes: Based on the pipeline code of the reflux zone, the preset pipeline connection relationship database is used to obtain the regulating valve associated with the pipeline segment of the reflux zone as the target valve; Pipe sections in the reverse flow zone whose target valves are the same are grouped into the same valve group. The corrected opening of the target valve for each pipe section in the same valve group is obtained based on the reverse flow coefficient of each reverse flow zone pipe section in the same valve group. for: in The initial opening degree of the target valve in the j-th valve group is m. j It is the total number of pipe segments marked with the backflow zone pipe code within valve group j. It is the target valve correction opening of the j-th valve group; Adjust the valve opening according to the target valve correction opening.

7. The industrial wastewater treatment and discharge monitoring and early warning method according to claim 6, characterized in that, Before adjusting the valve opening according to the target valve correction opening, the method further includes: Set the minimum safe opening of the valve, compare the target valve correction opening with the minimum safe opening of the valve, and when the target valve correction opening is less than the minimum safe opening, adjust the valve opening according to the minimum safe opening. A level 3 warning is triggered when the valve opening is adjusted to the minimum safe opening degree.

8. An industrial wastewater treatment and discharge monitoring and early warning system, used to perform the method according to any one of claims 1-7, characterized in that, The system includes: a flow monitoring module, a pressure deviation analysis module, and a backflow control module, which are connected in sequence. The flow monitoring module is used to obtain a first positive flow value based on the flow sensor at the front end of the wastewater discharge pipeline, obtain a second positive flow value based on the flow sensor at the rear end of the wastewater discharge pipeline, and calculate the flow difference based on the first positive flow value and the second positive flow value. The pressure deviation analysis module is used to trigger a first-level early warning and start the pipeline pressure sensor group to detect pressure data at key points of the pipeline when the flow difference is greater than the preset first backflow judgment threshold. The pressure deviation is obtained by the pipeline pressure model based on the pressure data at key points of the pipeline. The backflow control module is used to trigger a secondary warning and provide feedback on the backflow zone pipeline code when the pressure deviation is greater than the preset second backflow judgment threshold. It obtains the backflow flow coefficient based on the pressure deviation and the flow rate difference, and adjusts the valve opening based on the backflow flow coefficient and the backflow zone pipeline code.

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