High-precision sludge external reflux on-line monitoring and precise regulation and control system

Abstract

The invention relates to the technical field of sludge treatment, and discloses a high-precision sludge external reflux on-line monitoring and precise regulation and control system, which comprises: a region division unit, which is used for dividing a biochemical pool into a grid shape; the acquisition unit is used for acquiring sludge concentration information in each grid unit; the reflux pump control unit is used for judging whether a sludge external reflux pump is started or not according to the sludge concentration information; controlling the initial opening degree of a sludge external reflux pump according to the sludge concentration information; the judging unit is used for judging whether the initial opening degree of the sludge external reflux pump is adjusted or not; the reflux pump control unit is further used for adjusting the opening degree of the sludge external reflux pump according to the adjustment coefficient to obtain the final opening degree; and a storage unit. According to the invention, while the external reflux control precision of the sludge is improved, integration and intelligentization of monitoring and regulation are realized, the operation condition of the biochemical pool is stabilized, the treatment efficiency is improved, and the operation energy consumption is reduced.

Description

Technical Field

[0001] This invention relates to the field of sludge treatment technology, and more specifically, to a high-precision online monitoring and control system for external sludge recirculation. Background Technology

[0002] In wastewater treatment processes, the biological treatment unit is a key link in achieving the removal of organic pollutants and the conversion of nitrogen and phosphorus. Among them, sludge external recirculation is the core operating method for maintaining sludge concentration and microbial activity in the biological treatment tank, and its control effect directly affects the system's treatment efficiency and operational stability.

[0003] In existing wastewater treatment plants, sludge recirculation typically relies on a fixed recirculation ratio or manual adjustment based on a limited number of monitoring points. This approach fails to accurately reflect the complex and dynamically changing sludge distribution within the biological treatment tank. During actual operation, due to factors such as fluctuations in influent water quality and volume, as well as differences in tank structure, sludge concentration within the biological treatment tank often exhibits significant spatial non-uniformity. Traditional control methods based on single-point monitoring or overall average values ​​can easily mask localized areas with excessively low or high sludge concentrations, leading to delayed or unbalanced external recirculation control. Furthermore, current technologies for controlling sludge recirculation pumps primarily focus on whether they are turned on or a simple opening setting, lacking continuous analysis of sludge concentration trends. Adjustments are often made based solely on monitoring results at a single moment, making them susceptible to short-term disturbances. This results in frequent start-ups and shutdowns or repeated adjustments, increasing equipment energy consumption and mechanical wear, and hindering the long-term stable operation of the biological treatment system. Although some control schemes have introduced automated control methods, their regulation logic is still relatively crude and fails to fully take into account the differences in sludge concentration and its variation range in different areas, making it difficult to achieve a precise match between the return intensity and the actual operating status.

[0004] Therefore, it is necessary to provide a high-precision online monitoring and precise control system for sludge external return to solve the problems that existing sludge external return control in sewage treatment plants is difficult to accurately match the actual operating conditions, which can easily lead to control lag and imbalance, increased equipment energy consumption and wear, and instability of the biochemical system. Summary of the Invention

[0005] In view of this, the present invention proposes a high-precision online monitoring and precise control system for sludge external return, which aims to solve the problems of existing sludge external return control in sewage treatment plants being difficult to accurately match the actual operating conditions, easily leading to control lag and imbalance, increased equipment energy consumption and wear, and instability of the biochemical system.

[0006] This invention proposes a high-precision online monitoring and precise control system for sludge external recirculation, comprising: The regional division unit is used to divide the biological pool into a grid, forming several grid units; The data acquisition unit is used to obtain sludge concentration information within each grid unit. The return pump control unit is used to determine whether to start the external sludge return pump based on the sludge concentration information; if it is determined that the external sludge return pump should be started, the initial opening degree of the external sludge return pump is controlled according to the sludge concentration information. The judgment unit is used to determine whether to adjust the initial opening of the sludge external return pump based on the changes in sludge concentration information within a preset time period. The return pump control unit is also used to, if it is determined to be an adjustment, set an adjustment coefficient according to the change of sludge concentration information of each grid unit, and adjust the opening of the sludge external return pump according to the adjustment coefficient to obtain the final opening. The storage unit is used to record sludge concentration information, changes in sludge concentration information, initial opening degree, adjustment coefficient, and final opening degree.

[0007] Furthermore, when the region division unit is used to divide the biological pool into a grid-like structure to form several grid units, it includes: The length and width of the biochemical pool are divided into several equal segments, and adjacent dividing lines form a grid unit. Several sampling points are set in each grid unit; the sampling points are evenly distributed in the grid unit.

[0008] Furthermore, when the acquisition unit is used to obtain sludge concentration information within each grid cell, it includes: A sludge concentration distribution matrix for each grid cell is constructed based on the sludge concentration information at the collection points. The overall sludge concentration distribution matrix of the biological treatment tank is constructed based on the unit sludge concentration distribution matrix.

[0009] Furthermore, when the return pump control unit determines whether to activate the external sludge return pump based on the sludge concentration information, it includes: Calculate the average sludge concentration of the sludge concentration distribution matrix for each unit; if the average sludge concentration is less than the preset sludge concentration value, then determine to turn on the sludge external return pump; if the average sludge concentration of all units is greater than or equal to the preset sludge concentration value, then determine not to turn on the sludge external return pump.

[0010] Furthermore, if the return pump control unit determines that the sludge external return pump should be turned on, and controls the initial opening degree of the sludge external return pump based on the sludge concentration information, it includes: The number of grid cells with a concentration less than the preset sludge concentration value is counted and recorded as the number of unqualified cells. And calculate the average value of the average sludge concentration of the grid cells that are less than the preset sludge concentration value, and record it as the average sludge concentration; The initial opening of the sludge external return pump is controlled based on the number of non-conforming items and the average sludge concentration.

[0011] Furthermore, when controlling the initial opening of the sludge external return pump based on the number of non-conforming items and the average sludge concentration, the following steps are included: Set quantity and concentration limits; If the number of non-compliant items is less than the quantity limit value, and the average sludge concentration is greater than or equal to the concentration limit value, then the initial opening degree is the first opening degree. If the number of non-compliant items is less than the quantity limit value and the average sludge concentration is less than the concentration limit value, then the initial opening degree is the second opening degree. If the number of non-compliant items is greater than or equal to the quantity limit value, and the average sludge concentration is greater than or equal to the concentration limit value, then the initial opening degree is the second opening degree. If the number of non-compliant items is greater than or equal to the quantity limit value, and the average sludge concentration is less than the concentration limit value, then the initial opening degree is the third opening degree. Where 0 < first opening < second opening < third opening ≤ 1.

[0012] Furthermore, when the judgment unit determines whether to adjust the initial opening of the sludge external return pump based on the changes in sludge concentration information within a preset time period, it includes: Obtain the rate of change of the mean sludge concentration in each unit within a preset time period using the sludge concentration distribution matrix. The initial opening of the sludge external return pump should be adjusted based on the rate of change of the average sludge concentration.

[0013] Furthermore, when determining whether to adjust the initial opening of the sludge external return pump based on the rate of change of the average sludge concentration, the following steps are included: Calculate the mean of the rate of change of sludge concentration in all grid cells, and denote it as the average rate of change; If the average rate of change is greater than or equal to the preset rate of change, it is determined that no adjustment is needed to the initial opening. If the average rate of change is less than the preset rate of change, then it is determined that the initial opening should be adjusted.

[0014] Furthermore, the return pump control unit is also used to set an adjustment coefficient based on the sludge concentration information change of each grid unit if an adjustment is determined to be needed, including: Calculate the difference between the preset rate of change and the average rate of change, and record it as the rate of change difference; Set a difference range. If the difference in the rate of change is less than the minimum value of the difference range, the adjustment coefficient is the first coefficient; if the difference in the rate of change is within the difference range, the adjustment coefficient is the second coefficient; if the difference in the rate of change is greater than the maximum value of the difference range, the adjustment coefficient is the third coefficient. Wherein, 1 < first coefficient < second coefficient < third coefficient < 1.5.

[0015] Furthermore, the return pump control unit is also used to adjust the opening degree of the sludge external return pump according to the adjustment coefficient, and when obtaining the final opening degree, it includes: The final opening is the product of the initial opening and the adjustment coefficient; and the maximum final opening is 1. When the average sludge concentration of the sludge concentration distribution matrix of each unit is greater than or equal to the preset sludge concentration value, the sludge external return pump is turned off.

[0016] Compared with existing technologies, the advantages of this invention are as follows: By dividing the biological treatment tank into grids and independently collecting and analyzing the sludge concentration within each grid unit, this invention achieves refined perception of the sludge distribution within the biological treatment tank. Compared to traditional monitoring methods based on single-point or overall average values, it can more realistically and comprehensively reflect the spatial non-uniformity of sludge concentration, thus providing a more reliable data foundation for subsequent regulation. Simultaneously, the system determines whether to activate the external sludge return pump based on real-time sludge concentration information, and after activation, determines the initial opening degree based on the sludge concentration state. This transforms sludge return control from experience-based adjustment to data-driven automatic control, reducing the uncertainty caused by manual intervention. Furthermore, by setting a judgment unit to analyze the sludge concentration changes within a preset time period, the system can identify the dynamic evolution trend of sludge concentration, avoiding frequent adjustments to the return pump opening due to instantaneous fluctuations, and improving the stability and continuity of the regulation process. When adjustments are needed, the return pump control unit sets adjustment coefficients based on the sludge concentration changes in each grid unit and calculates the final opening degree accordingly. This ensures the control range matches the actual operating state, effectively preventing excessive or insufficient return. Furthermore, the storage unit uniformly records sludge concentration information, changes, and opening parameters at each stage. This not only provides data support for tracing, analyzing, and optimizing system operation but also lays the foundation for subsequent process parameter calibration and strategy optimization. Through the synergistic cooperation of the above technical solutions, this invention improves the accuracy of sludge external return control while achieving integrated and intelligent monitoring and control, contributing to stable operating conditions of the biological treatment tank, improved treatment efficiency, and reduced operating energy consumption. Attached Figure Description

[0017] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 This is a functional block diagram of the high-precision online monitoring and precise control system for sludge external reflux provided in an embodiment of the present invention. Detailed Implementation

[0018] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the disclosure to those skilled in the art. It should be noted that, unless otherwise specified, embodiments and features in the embodiments of the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0019] Specifically, this application is based on the online monitoring device for the concentration and flow rate of wastewater treatment plant channel-type external return sludge in the online monitoring device and method for the concentration and flow rate of wastewater treatment plant channel-type external return sludge in application number 202311649028.3.

[0020] In some embodiments of this application, see Figure 1 As shown, this embodiment provides a high-precision online monitoring and precise control system for sludge external recirculation, including: The regional division unit is used to divide the biological pool into a grid, forming several grid units; The data acquisition unit is used to obtain sludge concentration information within each grid unit. The return pump control unit is used to determine whether to start the external sludge return pump based on the sludge concentration information; if it is determined that the external sludge return pump should be started, the initial opening degree of the external sludge return pump is controlled according to the sludge concentration information. The judgment unit is used to determine whether to adjust the initial opening of the sludge external return pump based on the changes in sludge concentration information within a preset time period. The return pump control unit is also used to, if it is determined to be an adjustment, set an adjustment coefficient according to the change of sludge concentration information of each grid unit, and adjust the opening of the sludge external return pump according to the adjustment coefficient to obtain the final opening. The storage unit is used to record sludge concentration information, changes in sludge concentration information, initial opening degree, adjustment coefficient, and final opening degree.

[0021] Understandably, this invention achieves refined perception of the sludge distribution within the biological treatment tank by dividing it into grids and independently collecting and analyzing the sludge concentration in each grid unit. Compared to traditional monitoring methods based on single-point or overall average values, this approach more accurately and comprehensively reflects the spatial non-uniformity of sludge concentration, thus providing a more reliable data foundation for subsequent control. Simultaneously, the system determines whether to activate the external sludge return pump based on real-time sludge concentration information and, once activated, determines the initial opening degree based on the sludge concentration status. This transforms sludge return control from experience-based adjustment to data-driven automatic control, reducing the uncertainty caused by manual intervention. Furthermore, by setting a judgment unit to analyze sludge concentration changes within a preset time period, the system can identify the dynamic evolution trend of sludge concentration, avoiding frequent adjustments to the return pump opening due to instantaneous fluctuations and improving the stability and continuity of the control process. When adjustments are needed, the return pump control unit sets adjustment coefficients based on the sludge concentration changes in each grid unit and calculates the final opening degree accordingly. This ensures the control range matches the actual operating state, effectively preventing excessive or insufficient return. Furthermore, the storage unit uniformly records sludge concentration information, changes, and opening parameters at each stage. This not only provides data support for tracing, analyzing, and optimizing system operation but also lays the foundation for subsequent process parameter calibration and strategy optimization. Through the synergistic cooperation of the above technical solutions, this invention improves the accuracy of sludge external return control while achieving integrated and intelligent monitoring and control, contributing to stable operating conditions of the biological treatment tank, improved treatment efficiency, and reduced operating energy consumption.

[0022] In some embodiments of this application, when the region division unit is used to divide the biochemical pool into a grid to form several grid units, it includes: The length and width of the biochemical pool are divided into several equal segments, and adjacent dividing lines form a grid unit. Several sampling points are set in each grid unit; the sampling points are evenly distributed in the grid unit.

[0023] Understandably, dividing the length and width of the biological treatment tank into equal parts, creating regular grid cells with adjacent dividing lines, and then evenly distributing several sampling points within each grid cell, effectively improves the spatial representativeness and data reliability of sludge concentration monitoring. Compared to methods that only deploy sampling points in localized or single locations within the biological treatment tank, this gridded structure avoids monitoring biases caused by localized flow regime changes, sludge deposition, or uneven mixing, ensuring that the collected sludge concentration information more accurately reflects the operational status of each area. Simultaneously, the uniform distribution of sampling points within the grid cells helps reduce the impact of single-point anomalies on overall judgment, improving the stability and accuracy of unit sludge concentration calculations. Furthermore, the regularized grid division facilitates subsequent comparative analysis and trend assessment of different areas, and provides a clear data structure foundation for refined control of sludge external recirculation, thereby enhancing the overall scalability and engineering adaptability of the system.

[0024] In one specific embodiment, the biological treatment tank is 40 meters long and 20 meters wide. The area division unit divides the tank into 8 equal segments along its length and 4 equal segments along its width, forming 32 grid units. Within each grid unit, four sludge concentration collection points are evenly distributed, located at the four equal division points of that grid unit. The collection unit periodically acquires sludge concentration data from each collection point and summarizes the collected data within the same grid unit to obtain a representative sludge concentration value for that grid unit. This achieves comprehensive coverage and refined monitoring of the sludge concentration distribution within the biological treatment tank, providing accurate data support for subsequent sludge external return control.

[0025] In some embodiments of this application, when the acquisition unit is used to obtain sludge concentration information within each grid cell, it includes: A sludge concentration distribution matrix for each grid cell is constructed based on the sludge concentration information at the collection points. The overall sludge concentration distribution matrix of the biological treatment tank is constructed based on the unit sludge concentration distribution matrix.

[0026] Understandably, by constructing a grid-based sludge concentration distribution matrix based on sludge concentration information from each collection point, and further forming an overall sludge concentration distribution matrix for the biological treatment tank, discrete collected data can be transformed into a systematic data representation with spatial structural characteristics. On the one hand, the unit sludge concentration distribution matrix can reflect the distribution differences of sludge concentration within the same grid unit, avoiding the problem of ignoring local anomalies by only using average values, thereby improving the precision and accuracy of unit sludge concentration characterization. On the other hand, the overall sludge concentration distribution matrix integrates the concentration information of each grid unit with a unified data structure, making the differences and trends in sludge concentration between different areas within the biological treatment tank more intuitive and comparable, which is beneficial for subsequent control strategies to comprehensively consider spatial non-uniformity.

[0027] In one specific embodiment, a biological treatment tank is divided into several grid units. Each grid unit has four sludge concentration sampling points. Within the same sampling period, the sampling unit acquires the sludge concentration values ​​corresponding to the four sampling points, for example, 3.1 g / L, 3.3 g / L, 3.0 g / L, and 3.2 g / L respectively, and constructs a unit sludge concentration distribution matrix containing these concentration values. Subsequently, the unit sludge concentration distribution matrices corresponding to all grid units are arranged and combined according to their spatial positions within the biological treatment tank to form the overall sludge concentration distribution matrix of the biological treatment tank. This overall sludge concentration distribution matrix allows for the intuitive identification of areas with low or abnormally changing sludge concentrations.

[0028] In some embodiments of this application, when the reflux pump control unit is used to determine whether to activate the external sludge reflux pump based on the sludge concentration information, it includes: Calculate the average sludge concentration of the sludge concentration distribution matrix for each unit; if the average sludge concentration is less than the preset sludge concentration value, then determine to turn on the sludge external return pump; if the average sludge concentration of all units is greater than or equal to the preset sludge concentration value, then determine not to turn on the sludge external return pump.

[0029] Understandably, by calculating the average sludge concentration from the sludge concentration distribution matrix of each unit and comparing this average with a preset sludge concentration value to determine whether to activate the sludge external return pump, the external return decision is based on multi-regional, quantitative analysis, rather than relying on single-point or experience-based judgments, thereby improving the objectivity and reliability of the judgment results. This method uses grid units as the basic decision granularity, enabling timely identification of any localized area in the biological treatment tank where sludge concentration is low, avoiding the problem of overall average values ​​masking local anomalies and causing control lag. Furthermore, activating the external return pump only when the average sludge concentration of a unit is lower than the preset value helps prevent unnecessary return operations, reducing energy consumption and equipment wear.

[0030] In one specific embodiment, the biological treatment tank is divided into 9 grid units. Within the same monitoring period, the average sludge concentration for each grid unit is calculated, with average values ​​such as 3.2 g / L, 3.1 g / L, 3.3 g / L, 2.9 g / L, 3.0 g / L, 3.2 g / L, 3.1 g / L, 3.3 g / L, and 3.2 g / L. The preset sludge concentration value is 3.0 g / L. Since the average sludge concentration of at least one grid unit is 2.9 g / L, which is less than the preset sludge concentration value, the return pump control unit determines that the external sludge return pump needs to be activated and proceeds to the subsequent initial opening control process. If, within another monitoring period, the average sludge concentration of each grid unit is not less than 3.0 g / L, it is determined that the external sludge return pump does not need to be activated.

[0031] In some embodiments of this application, when the return pump control unit determines that the sludge external return pump should be turned on, and controls the initial opening degree of the sludge external return pump according to the sludge concentration information, it includes: The number of grid cells with a concentration less than the preset sludge concentration value is counted and recorded as the number of unqualified cells. And calculate the average value of the average sludge concentration of the grid cells that are less than the preset sludge concentration value, and record it as the average sludge concentration; The initial opening of the sludge external return pump is controlled based on the number of non-conforming items and the average sludge concentration.

[0032] In some embodiments of this application, controlling the initial opening of the sludge external return pump based on the number of non-conforming items and the average sludge concentration includes: Set quantity and concentration limits; If the number of non-compliant items is less than the quantity limit value, and the average sludge concentration is greater than or equal to the concentration limit value, then the initial opening degree is the first opening degree. If the number of non-compliant items is less than the quantity limit value and the average sludge concentration is less than the concentration limit value, then the initial opening degree is the second opening degree. If the number of non-compliant items is greater than or equal to the quantity limit value, and the average sludge concentration is greater than or equal to the concentration limit value, then the initial opening degree is the second opening degree. If the number of non-compliant items is greater than or equal to the quantity limit value, and the average sludge concentration is less than the concentration limit value, then the initial opening degree is the third opening degree. Where 0 < first opening < second opening < third opening ≤ 1.

[0033] Understandably, by simultaneously introducing both the number of non-compliant sludge samples and the average sludge concentration to jointly determine the initial opening of the sludge external return pump, the setting of the return intensity can comprehensively reflect the "range" and "degree" of the low-concentration area, thus avoiding the problems of insufficient or excessive return caused by relying on only a single indicator. Specifically, the number of non-compliant samples characterizes the distribution range of areas with low sludge concentration in the biological treatment tank, while the average sludge concentration reflects the overall deviation of these areas. The combination of these two metrics can more accurately depict the current operating status of the biological treatment tank. Based on this, by setting quantity and concentration limit values ​​and adopting a graded opening strategy, the initial opening exhibits a step-like change, which helps improve the stability and interpretability of the control logic and avoids the impact of frequent small fluctuations on the equipment. At the same time, the opening is limited within a preset range, ensuring both control effectiveness and energy consumption control and equipment safety, contributing to the refined and energy-efficient operation of the sludge external return process.

[0034] In one specific embodiment, the preset sludge concentration value is set to 3.0 g / L, the quantity limit value is set to 3 grid units, the concentration limit value is set to 2.8 g / L, and the first, second, and third opening degrees are set to 0.3, 0.6, and 0.9, respectively. During a certain monitoring period, it was found that the average sludge concentration of two grid units was below 3.0 g / L, with corresponding average sludge concentrations of 2.9 g / L and 2.7 g / L, respectively. The calculated average sludge concentration was 2.8 g / L. Since the number of non-compliant units was less than the quantity limit value, and the average sludge concentration was greater than or equal to the concentration limit value, the initial opening degree of the sludge external return pump was set to the first opening degree of 0.3. In another monitoring period, if the number of non-compliant units increased to 4, and the average sludge concentration decreased to 2.6 g / L, the initial opening degree was set to the third opening degree of 0.9 to enhance the sludge external return intensity.

[0035] In some embodiments of this application, when the determination unit is used to determine whether to adjust the initial opening of the sludge external return pump based on the changes in sludge concentration information within a preset time period, the determination includes: Obtain the rate of change of the mean sludge concentration in each unit within a preset time period using the sludge concentration distribution matrix. The initial opening of the sludge external return pump should be adjusted based on the rate of change of the average sludge concentration.

[0036] In some embodiments of this application, determining whether to adjust the initial opening of the sludge external return pump based on the rate of change of the average sludge concentration includes: Calculate the mean of the rate of change of sludge concentration in all grid cells, and denote it as the average rate of change; If the average rate of change is greater than or equal to the preset rate of change, it is determined that no adjustment is needed to the initial opening. If the average rate of change is less than the preset rate of change, then it is determined that the initial opening should be adjusted.

[0037] In some embodiments of this application, the reflux pump control unit is further configured to, if determined to be an adjustment, set an adjustment coefficient based on the sludge concentration information change of each grid unit, including: Calculate the difference between the preset rate of change and the average rate of change, and record it as the rate of change difference; Set a difference range. If the difference in the rate of change is less than the minimum value of the difference range, the adjustment coefficient is the first coefficient; if the difference in the rate of change is within the difference range, the adjustment coefficient is the second coefficient; if the difference in the rate of change is greater than the maximum value of the difference range, the adjustment coefficient is the third coefficient. Wherein, 1 < first coefficient < second coefficient < third coefficient < 1.5.

[0038] In some embodiments of this application, the return pump control unit is further configured to adjust the opening degree of the sludge external return pump according to the adjustment coefficient, and when obtaining the final opening degree, the adjustment includes: The final opening is the product of the initial opening and the adjustment coefficient; and the maximum final opening is 1. When the average sludge concentration of the sludge concentration distribution matrix of each unit is greater than or equal to the preset sludge concentration value, the sludge external return pump is turned off.

[0039] Understandably, by introducing the average change rate of sludge concentration within a preset time period as the basis for regulation, the adjustment of the sludge external return pump no longer relies solely on the instantaneous concentration level, but comprehensively considers the changing trend of sludge concentration, thereby effectively avoiding frequent adjustments caused by short-term fluctuations. Using the average change rate of sludge concentration in each grid unit as a judgment indicator can reflect the improvement or deterioration trend of the overall operating status of the biological treatment tank, making the regulation decision more global and stable. When the average change rate reaches or exceeds the preset change rate, it indicates that the current return strategy has achieved the expected effect, and there is no need to adjust the initial opening, which helps to reduce unnecessary control actions and equipment wear; when the average change rate is lower than the preset change rate, the adjustment mechanism is activated to promptly enhance or correct the return intensity. On this basis, by dividing the system into zones based on the change rate difference and setting graded adjustment coefficients, the opening adjustment range is matched with the actual deviation, avoiding over-adjustment and ensuring the effectiveness of the regulation response. At the same time, setting an upper limit for the final opening and combining it with the closing conditions further improves the safety and energy efficiency of the system operation, and helps to achieve dynamic adaptive control of the sludge external return process.

[0040] In one specific embodiment, a preset time period of 30 minutes is set, a preset change rate of 0.05 is set, and the first, second, and third coefficients are set to 1.05, 1.15, and 1.30, respectively. Within a certain operating cycle, the system calculates the average change rates of sludge concentration in each grid unit as 0.04, 0.03, 0.05, 0.02, and 0.04, respectively. The average change rate is 0.036, which is less than the preset change rate of 0.05, indicating that the initial opening of the sludge external return pump needs adjustment. Further calculation shows the difference between the preset change rate and the average change rate is 0.014, and the adjustment coefficient is determined to be the second coefficient of 1.15 based on the difference range. If the initial opening is 0.6, then the final opening is 0.6 × 1.15 = 0.69. Subsequently, in subsequent monitoring cycles, when the average sludge concentration of all grid units reaches or exceeds the preset sludge concentration value, the sludge external return pump is automatically shut down.

[0041] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program goods. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program goods embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0042] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program goods according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0043] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0044] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A high-precision sludge external reflux online monitoring and precise control system, characterized in that, The method comprises the following steps: a region division unit is used to divide the biochemical tank into a grid shape to form a plurality of grid units; a collection unit is used to obtain sludge concentration information in each grid unit; a reflux pump control unit is used to determine whether to start a sludge external reflux pump according to the sludge concentration information; if it is determined to start the sludge external reflux pump, the initial opening degree of the sludge external reflux pump is controlled according to the sludge concentration information; a determination unit is used to determine whether to adjust the initial opening degree of the sludge external reflux pump according to the sludge concentration information change within a preset period; the reflux pump control unit is further used to, if it is determined to adjust, set an adjustment coefficient according to the sludge concentration information change of each grid unit, adjust the opening degree of the sludge external reflux pump according to the adjustment coefficient, and obtain a final opening degree; a storage unit is used to record the sludge concentration information, the sludge concentration information change, the initial opening degree, the adjustment coefficient and the final opening degree.

2. The high-precision sludge external reflux online monitoring and precise control system according to claim 1, characterized in that, When the region division unit is used to divide the biochemical tank into a grid shape to form a plurality of grid units, the following steps are included: the length and width of the biochemical tank are respectively divided into a plurality of sections, adjacent division lines form grid units, and a plurality of collection points are arranged in each grid unit; wherein the collection points are uniformly distributed in the grid unit.

3. The high-precision sludge external reflux online monitoring and precise control system according to claim 2, characterized in that, When the collection unit is used to obtain sludge concentration information in each grid unit, the following steps are included: a unit sludge concentration distribution matrix of each grid unit is constructed according to the sludge concentration information of the collection points; and a whole sludge concentration distribution matrix of the biochemical tank is constructed according to the unit sludge concentration distribution matrix.

4. The high-precision sludge external reflux online monitoring and precise control system according to claim 3, characterized in that, When the reflux pump control unit is used to determine whether to start the sludge external reflux pump according to the sludge concentration information, the following steps are included: the sludge concentration average value of each unit sludge concentration distribution matrix is calculated; if there is a sludge concentration average value less than a preset sludge concentration value, it is determined to start the sludge external reflux pump; if all unit sludge concentration average values are greater than or equal to the preset sludge concentration value, it is determined not to start the sludge external reflux pump.

5. The high-precision sludge external reflux online monitoring and precise regulation system according to claim 4, characterized in that, When the reflux pump control unit determines to start the sludge external reflux pump according to the sludge concentration information to control the initial opening degree of the sludge external reflux pump, the following steps are included: the number of grid units less than the preset sludge concentration value is counted, which is recorded as the unqualified number; and the average value of the sludge concentration average values of the grid units less than the preset sludge concentration value is calculated, which is recorded as the average sludge concentration; the initial opening degree of the sludge external reflux pump is controlled according to the unqualified number and the average sludge concentration.

6. The high-precision sludge external reflux online monitoring and precise regulation system according to claim 5, characterized in that, When the initial opening degree of the sludge external reflux pump is controlled according to the unqualified number and the average sludge concentration, the following steps are included: a number limit value and a concentration limit value are set; if the unqualified number is less than the number limit value and the average sludge concentration is greater than or equal to the concentration limit value, the initial opening degree is a first opening degree; if the unqualified number is less than the number limit value and the average sludge concentration is less than the concentration limit value, the initial opening degree is a second opening degree; if the unqualified number is greater than or equal to the number limit value and the average sludge concentration is greater than or equal to the concentration limit value, the initial opening degree is a second opening degree; If the unqualified number is greater than or equal to the number limit value, and the average sludge concentration is less than the concentration limit value, the initial opening degree is a third opening degree; Wherein, 0 < the first opening degree < the second opening degree < the third opening degree ≤ 1.

7. The high-precision sludge external reflux online monitoring and precise regulation system according to claim 1, characterized in that, The judging unit is configured to judge whether to adjust the initial opening degree of the sludge external reflux pump according to the sludge concentration information change in a preset period, and comprises: Obtaining a sludge concentration mean value change rate of each unit sludge concentration distribution matrix in a preset period; Judging whether to adjust the initial opening degree of the sludge external reflux pump according to the sludge concentration mean value change rate.

8. The high-precision sludge external reflux online monitoring and precise regulation system according to claim 7, characterized in that, The judging whether to adjust the initial opening degree of the sludge external reflux pump according to the sludge concentration mean value change rate comprises: Calculating a mean value of the sludge concentration mean value change rates of all grid units, denoted as an average change rate; If the average change rate is greater than or equal to a preset change rate, it is judged that the initial opening degree does not need to be adjusted; If the average change rate is less than the preset change rate, it is judged that the initial opening degree needs to be adjusted.

9. The high-precision sludge external reflux online monitoring and precise regulation system according to claim 8, characterized in that, The reflux pump control unit is further configured to, if it is judged that adjustment is needed, set an adjustment coefficient according to the sludge concentration information change of each grid unit, and comprises: Calculating a difference value between the preset change rate and the average change rate, denoted as a change rate difference value; Setting a difference value interval, if the change rate difference value is less than a minimum value of the difference value interval, the adjustment coefficient is a first coefficient; if the change rate difference value is in the difference value interval, the adjustment coefficient is a second coefficient; if the change rate difference value is greater than a maximum value of the difference value interval, the adjustment coefficient is a third coefficient; Wherein, 1 < the first coefficient < the second coefficient < the third coefficient < 1.

5.

10. The high-precision sludge external reflux online monitoring and precise regulation system according to claim 9, characterized in that, The reflux pump control unit is further configured to adjust the opening degree of the sludge external reflux pump according to the adjustment coefficient to obtain a final opening degree, and comprises: The final opening degree is a product value of the initial opening degree and the adjustment coefficient; and the final opening degree is at most 1; When the sludge concentration mean value of each unit sludge concentration distribution matrix is greater than or equal to a preset sludge concentration value, the sludge external reflux pump is closed.

Images