A control method and system for multi-point intelligent dosing of phosphorus removal reagents

Abstract

The application discloses a kind of multi-point intelligent control method and system of adding phosphorus-removing reagent, comprising: obtaining pre-set parameters, comparing current total phosphorus value with front-end dosing total phosphorus target value, to obtain comparison result;According to the comparison result, the front-end dosing system is operated or stopped in primary sedimentation tank;Calculate the end dosing flow of biological pool, and control the end dosing device of biological pool to automatically adjust stroke according to the end dosing flow of biological pool;Calculate the feedforward dosing flow;According to the feedforward dosing flow, the feedforward dosing device is automatically adjusted to control stroke;Calculate filter dosing flow from current total phosphorus value, filter dosing total phosphorus target value, filter dosing flow gradient value and filter minimum dosing flow value;According to filter dosing flow, the filter dosing device is automatically adjusted to control operating frequency.The method can control the total phosphorus value as a whole, improve the phosphorus removal effect of effluent, so that the effluent quality can be accurately controlled, and the discharge standard can be continuously and stably reached.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to a control method and system for multi-point intelligent dosing of phosphorus removal agents. Background Technology

[0002] Currently, chemical phosphorus removal is a common treatment method in wastewater treatment. Existing phosphorus removal agent dosing devices mostly rely on manual operation, and the control of the dosage is not precise enough, resulting in waste of agents or poor treatment effect. Although some systems have tried to add agents through simple automated control, they lack the ability to dynamically adjust based on real-time water quality data and cannot achieve precise control. They mostly automatically control the addition of phosphorus removal agents at a certain dosing point, resulting in poor phosphorus removal effect and water quality that does not meet expectations. Summary of the Invention

[0003] The purpose of this invention is to provide a control method and system for multi-point intelligent dosing of phosphorus removal agents. In the process of wastewater treatment, phosphorus removal agents can be automatically and accurately added at multiple dosing points to improve the phosphorus removal effect of effluent, save manual workload, and ensure the quality of effluent.

[0004] This invention is achieved through the following technical solution:

[0005] In a first aspect, the present invention provides a control method for multi-point intelligent dosing of phosphorus removal agents, comprising:

[0006] Obtain pre-set parameters, including: effluent total phosphorus control target value, front-end chemical dosing total phosphorus target value, current effluent total phosphorus value, effective concentration of phosphorus removal agent, minimum dosage of phosphorus removal agent, maximum dosage of phosphorus removal agent, phosphate feedforward early warning value, feedforward dosing correction coefficient, filter dosing total phosphorus target value, filter dosing minimum flow rate, and filter dosing flow rate gradient value.

[0007] The current total phosphorus value of the effluent is compared with the target total phosphorus value of the front-end chemical dosing to obtain the comparison result. Based on the comparison result, the operation or shutdown of the front-end chemical dosing system at the primary sedimentation tank is controlled.

[0008] The final dosing flow rate of the biological tank is calculated based on the current total phosphorus value of the effluent, the target value of total phosphorus control in the effluent, the effective concentration of the phosphorus removal agent and the minimum dosage value of the phosphorus removal agent. The stroke of the final dosing device of the biological tank is automatically adjusted according to the final dosing flow rate of the biological tank.

[0009] Phosphate values ​​from multiple biological tanks were obtained from the analysis of orthophosphate equipment, and the average phosphate value was calculated. Based on the average phosphate value, the phosphate feedforward early warning value, and the feedforward dosing correction coefficient, the feedforward dosing flow rate was calculated. The feedforward dosing device was automatically adjusted to control the stroke based on the feedforward dosing flow rate.

[0010] The filter dosing flow rate is calculated based on the current total phosphorus value of the effluent, the target total phosphorus value for filter dosing, the filter dosing flow rate gradient value, and the minimum filter dosing flow rate value. The filter dosing device is then automatically adjusted to adjust its operating frequency according to the filter dosing flow rate.

[0011] Furthermore, the comparison results include situations where the current effluent total phosphorus value is less than the target value for total phosphorus from the front-end chemical dosing and where the current effluent total phosphorus value is greater than or equal to the target value for total phosphorus from the front-end chemical dosing. The specific steps of controlling the operation or shutdown of the front-end chemical dosing system at the primary sedimentation tank based on the comparison results include:

[0012] When the current total phosphorus value in the effluent is lower than the target total phosphorus value for the front-end dosing, the front-end dosing system will be shut down.

[0013] When the current total phosphorus value of the effluent is greater than or equal to the target value of total phosphorus for the front-end chemical dosing, the front-end chemical dosing system will start a diaphragm metering pump and automatically adjust the frequency to the required operating frequency. The operating frequency and the start and stop of the front-end diaphragm metering pump will also be automatically adjusted according to the change in the current total phosphorus value of the effluent.

[0014] Furthermore, the parameters also include the front-end dosing frequency gradient, and the calculation formula for automatically adjusting the operating frequency based on the change in the current total phosphorus value of the effluent is as follows:

[0015] Operating frequency = Starting frequency + (Current total phosphorus value in effluent - Target total phosphorus value for front-end dosing) × 100 × Front-end dosing frequency gradient.

[0016] Furthermore, based on the current total phosphorus value in the effluent, the target total phosphorus control value in the effluent, the effective concentration of the phosphorus removal agent, and the minimum dosage value of the phosphorus removal agent, the calculation formula for the terminal dosing flow rate of the biological treatment tank is as follows:

[0017] The flow rate of chemical dosing at the end of the biological treatment tank = (current total phosphorus value in the effluent - target total phosphorus control value in the effluent) × 0.1 / effective concentration of phosphorus removal agent + minimum dosage of phosphorus removal agent.

[0018] Furthermore, the specific methods for automatically adjusting the stroke of the end-of-pipe dosing device in the biological treatment tank based on the end-of-pipe dosing flow rate include:

[0019] The flow rate of the biological tank terminal dosing is divided into three parts: one part is added to the first sludge pumping station, and the other two parts are added to the second sludge pumping station. The stroke of the corresponding biological tank terminal dosing device is automatically adjusted according to the flow rate of the biological tank terminal dosing to the first and second sludge pumping stations, and the biological tank terminal dosing flow rate is recalculated within a first set time.

[0020] Furthermore, based on the average phosphate concentration, the phosphate feedforward early warning value, and the feedforward dosing correction coefficient, the formula for calculating the feedforward dosing flow rate is as follows:

[0021] Feedforward dosing flow rate = (mean phosphate value - phosphate feedforward warning value) × feedforward dosing correction coefficient.

[0022] Furthermore, the specific methods for automatically adjusting the stroke of the feedforward dosing device based on the feedforward dosing flow rate include:

[0023] The feedforward dosing flow rate is divided into three parts: one part is added to the first sludge pumping station, and the other two parts are added to the second sludge pumping station. The corresponding feedforward dosing device is automatically adjusted according to the feedforward dosing flow rate added to the first and second sludge pumping stations, and the feedforward dosing flow rate is recalculated within a second set time.

[0024] Furthermore, based on the current total phosphorus value of the effluent, the target total phosphorus value for filter dosing, the filter dosing flow rate gradient, and the minimum filter dosing flow rate, the formula for calculating the filter dosing flow rate is as follows:

[0025] Filter dosing flow rate = (current total phosphorus value in effluent - target total phosphorus value for filter dosing) × filter dosing flow rate gradient + minimum filter dosing flow rate.

[0026] Secondly, the present invention provides a control system for multi-point intelligent dosing of phosphorus removal agents, comprising: a parameter acquisition module, a front-end dosing control module, a back-end dosing control module, a feedforward dosing control module, and a filter bed dosing control module;

[0027] The parameter acquisition module is used to acquire pre-set parameters, including: effluent total phosphorus control target value, front-end chemical dosing total phosphorus target value, current effluent total phosphorus value, effective concentration of phosphorus removal agent, minimum dosage of phosphorus removal agent, maximum dosage of phosphorus removal agent, phosphate feedforward early warning value, feedforward dosing correction coefficient, filter dosing total phosphorus target value, filter dosing minimum flow rate, and filter dosing flow rate gradient value.

[0028] The front-end dosing control module is used to compare the current total phosphorus value of the effluent with the target value of total phosphorus for front-end dosing, obtain the comparison result, and control the front-end dosing system at the primary sedimentation tank to operate or stop operating based on the comparison result.

[0029] The terminal dosing control module is used to calculate the terminal dosing flow rate of the biological tank based on the current total phosphorus value of the effluent, the target value of total phosphorus control in the effluent, the effective concentration of the phosphorus removal agent, and the minimum dosage value of the phosphorus removal agent, and to control the terminal dosing device of the biological tank to automatically adjust the stroke based on the terminal dosing flow rate of the biological tank.

[0030] The feedforward dosing control module is used to obtain phosphate values ​​from multiple biological ponds from the orthophosphate equipment analysis, calculate the average phosphate value, calculate the feedforward dosing flow rate based on the average phosphate value, the phosphate feedforward early warning value, and the feedforward dosing correction coefficient, and control the feedforward dosing device to automatically adjust the stroke based on the feedforward dosing flow rate.

[0031] The filter dosing control module is used to calculate the filter dosing flow rate based on the current total phosphorus value of the effluent, the target total phosphorus value for filter dosing, the filter dosing flow rate gradient value, and the minimum dosing flow rate value of the filter, and to control the filter dosing device to automatically adjust its operating frequency according to the filter dosing flow rate.

[0032] Furthermore, the comparison results include the current effluent total phosphorus value being less than the front-end dosing total phosphorus target value and the current effluent total phosphorus value being greater than or equal to the front-end dosing total phosphorus target value. The front-end dosing control module includes a control unit. When the current effluent total phosphorus value is less than the front-end dosing total phosphorus target value, the control unit controls the front-end dosing system to stop operating. When the current effluent total phosphorus value is greater than or equal to the front-end dosing total phosphorus target value, the control unit controls the front-end dosing system to start a front-end diaphragm metering pump and automatically adjust the frequency to reach the required operating frequency. The control unit also automatically adjusts the operating frequency and starts / stops the front-end diaphragm metering pump according to the change in the current effluent total phosphorus value.

[0033] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0034] This invention provides a control method and system for multi-point intelligent dosing of phosphorus removal agents. By adding phosphorus removal agents to multiple locations such as the primary sedimentation tank, biological tank, and filter, it achieves automatic start-up and shutdown, automatic flow rate adjustment, and precise dosing of phosphorus removal agents, reducing manual workload. It can accurately control the total phosphorus value of the effluent in the primary sedimentation tank, biological tank, and filter, thereby improving the overall phosphorus removal effect and enabling precise control of effluent water quality to continuously and stably meet discharge standards. Attached Figure Description

[0035] To more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of the present invention and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort. In the drawings:

[0036] Figure 1 A flowchart of a control method for multi-point intelligent dosing of phosphorus removal agents provided in the first embodiment of the present invention;

[0037] Figure 2 The diagram below shows a structural block diagram of a control system for multi-point intelligent dosing of phosphorus removal agents, provided in another embodiment of the present invention. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and are not intended to limit the present invention.

[0039] Example 1

[0040] like Figure 1 As shown, the first embodiment of the present invention provides a control method for multi-point intelligent dosing of phosphorus removal agents, applicable to a control system for multi-point intelligent dosing of phosphorus removal agents. The method includes the following steps:

[0041] Obtain pre-set parameters, including: effluent total phosphorus control target value, front-end chemical dosing total phosphorus target value, current effluent total phosphorus value, effective concentration of phosphorus removal agent, minimum dosage of phosphorus removal agent, maximum dosage of phosphorus removal agent, phosphate feedforward early warning value, feedforward dosing correction coefficient, filter dosing total phosphorus target value, filter dosing minimum flow rate, and filter dosing flow rate gradient value.

[0042] The current total phosphorus value of the effluent is compared with the target total phosphorus value of the front-end chemical dosing to obtain the comparison result. Based on the comparison result, the operation or shutdown of the front-end chemical dosing system at the primary sedimentation tank is controlled.

[0043] The final dosing flow rate of the biological tank is calculated based on the current total phosphorus value of the effluent, the target value of total phosphorus control in the effluent, the effective concentration of the phosphorus removal agent and the minimum dosage value of the phosphorus removal agent. The stroke of the final dosing device of the biological tank is automatically adjusted according to the final dosing flow rate of the biological tank.

[0044] Phosphate values ​​from multiple biological tanks were obtained from the analysis of orthophosphate equipment, and the average phosphate value was calculated. Based on the average phosphate value, the phosphate feedforward early warning value, and the feedforward dosing correction coefficient, the feedforward dosing flow rate was calculated. The feedforward dosing device was automatically adjusted to control the stroke based on the feedforward dosing flow rate.

[0045] The filter dosing flow rate is calculated based on the current total phosphorus value of the effluent, the target total phosphorus value for filter dosing, the filter dosing flow rate gradient value, and the minimum filter dosing flow rate value. The filter dosing device is then automatically adjusted to adjust its operating frequency according to the filter dosing flow rate.

[0046] Users pre-set relevant parameters according to actual needs. These parameters include: effluent total phosphorus control target value, front-end chemical dosing total phosphorus target value, current effluent total phosphorus value, effective concentration of phosphorus removal agent, minimum dosage of phosphorus removal agent, maximum dosage of phosphorus removal agent, phosphate feedforward warning value, feedforward dosing correction coefficient, filter dosing total phosphorus target value, filter dosing minimum flow rate, filter dosing flow rate gradient value, and normal upper limit value of phosphate. These parameters will be involved in the calculation of other data later. The control methods for multi-point intelligent phosphorus removal agent dosing include: front-end dosing control method, biological tank end-of-pipe dosing control method, feedforward dosing control method, and filter dosing control method.

[0047] Front-end dosing control methods:

[0048] The comparison results include those where the current effluent total phosphorus value is less than the target value for total phosphorus from the upstream chemical dosing, and those where the current effluent total phosphorus value is greater than or equal to the target value for total phosphorus from the upstream chemical dosing. Based on these comparison results, the operation or shutdown of the upstream chemical dosing system at the primary sedimentation tank is controlled, specifically including:

[0049] When the current total phosphorus value in the effluent is lower than the target total phosphorus value for the front-end dosing, the front-end dosing system will be shut down.

[0050] When the current total phosphorus value of the effluent is greater than or equal to the target value of total phosphorus in the front-end dosing system, the front-end dosing system is controlled to start a front-end diaphragm metering pump and automatically adjust the frequency to the required operating frequency. The operating frequency and the start and stop of the diaphragm metering pump are also automatically adjusted according to the change of the current total phosphorus value of the effluent.

[0051] Specifically, the front-end dosing system includes three front-end diaphragm metering pumps. Dosing is performed by these three pumps in the primary sedimentation tank's distribution well. When the current effluent total phosphorus value has not reached the target value, these three pumps remain stopped. When the target value is reached, one pump automatically starts and its frequency is automatically adjusted to the required operating frequency. The pump's operating frequency and startup / shutdown are automatically adjusted based on changes in the current effluent total phosphorus value. When the front-end dosing system is switched on, it checks every minute whether the current effluent total phosphorus value is greater than the target value. If it is, it checks the number of operating pumps. If the number is zero, it checks if any pumps are in remote mode; if so, one is activated. The system then determines whether the current effluent total phosphorus value is lower than the target total phosphorus value for the front-end chemical dosing. If it is, all currently running remote-mode front-end diaphragm metering pumps are shut down. For example, if the target total phosphorus value for the front-end chemical dosing is 0.31, then if the current effluent total phosphorus value is greater than 0.31 and no front-end diaphragm metering pump is running, the system automatically starts one front-end diaphragm metering pump until the current effluent total phosphorus value is lower than 0.3, at which point all running front-end diaphragm metering pumps are shut down. Parameters also include the front-end chemical dosing frequency gradient. The calculation formula for automatically adjusting the operating frequency based on changes in the current effluent total phosphorus value is: Operating frequency = Starting frequency + (Current effluent total phosphorus value - Front-end chemical dosing target total phosphorus value) × 100 × Front-end chemical dosing frequency gradient. These parameters can be adjusted according to the actual production process conditions.

[0052] End-of-pipe chemical control methods for biological treatment ponds:

[0053] The final dosing of the biological treatment tank is supplied to the sludge pumping station by four diaphragm metering pumps in the dosing room: diaphragm metering pump No. 1, No. 2, No. 3, and No. 4. Specifically, diaphragm metering pumps No. 1 and No. 2 supply sludge to pumping station No. 1, and pumps No. 3 and No. 4 supply sludge to pumping station No. 2. Only one diaphragm metering pump is needed for each sludge pumping station. The dosing is continuous and uninterrupted, with the diaphragm metering pumps operating normally. The formula for calculating the final dosing flow rate of the biological treatment tank, based on the current effluent total phosphorus value, the target effluent total phosphorus control value, the effective concentration of the phosphorus removal agent, and the minimum dosage of the phosphorus removal agent, is: Final dosing flow rate of the biological treatment tank = (Current effluent total phosphorus value - effluent total phosphorus control target value) × 0.1 / Effective concentration of phosphorus removal agent + Minimum dosage of phosphorus removal agent. In this embodiment, the operation of diaphragm metering pump No. 1 is restricted, so the dosing flow rate at the end of the biological treatment tank is divided into three parts: one part for sludge pump station No. 1 and two parts for sludge pump station No. 2. The dosing flow rate at the end of the biological treatment tank is fed back to the corresponding operating diaphragm metering pump for automatic stroke adjustment. The dosing flow rate at the end of the biological treatment tank is calculated every 5 minutes, thereby achieving accurate dosing of phosphorus removal agents at the end of the biological treatment tank. In practical applications, the number of parts of the dosing flow rate at the end of the biological treatment tank and the calculation time for the dosing flow rate at the end of the biological treatment tank are set according to the actual situation.

[0054] Feedforward dosing control methods:

[0055] Phosphate values ​​for each biological tank were obtained from the analysis of the orthophosphate equipment. The average phosphate value was calculated based on these values. The feedforward dosing flow rate was then calculated using the formula: Feedforward Dosing Flow Rate = (Average Phosphate Value - Phosphate Feedforward Warning Value) × Feedforward Dosing Correction Coefficient. Two diaphragm metering pumps operating in the dosing room were automatically adjusted for stroke dosing based on the feedforward dosing flow rate control. When the average phosphate value was greater than the phosphate feedforward warning value, the feedforward dosing control participated in flow control; otherwise, it did not. If the average phosphate value exceeded the normal upper limit, it was considered a problem such as equipment malfunction or pipeline blockage, and therefore flow control was not activated. The feedforward dosing flow rate was divided into three parts: one part for sludge pump station No. 1 and two parts for sludge pump station No. 2. The feedforward dosing flow rate is fed back to the corresponding operating diaphragm metering pump to automatically adjust the stroke. The feedforward dosing flow rate is calculated every minute, thus achieving accurate dosing of phosphorus removal agents through feedforward dosing. In practical applications, the feedforward dosing flow rate fraction and the calculation time are set according to actual conditions.

[0056] Filter bed chemical dosing control methods:

[0057] The filter bed is dosing chemicals via a separate diaphragm metering pump (No. 5) in the dosing room. When the current effluent total phosphorus value has not reached the target total phosphorus value for the filter bed, diaphragm metering pump No. 5 is stopped; when the current effluent total phosphorus value reaches the target value, diaphragm metering pump No. 5 automatically starts operating. The filter bed dosing flow rate is calculated based on the current effluent total phosphorus value, the target total phosphorus value for the filter bed, the filter bed dosing flow rate gradient, and the minimum dosing flow rate of the filter bed. The formula is: Filter bed dosing flow rate = (Current effluent total phosphorus value - Target total phosphorus value for the filter bed) × Filter bed dosing flow rate gradient + Minimum dosing flow rate of the filter bed. The calculated filter bed dosing flow rate is fed back to diaphragm metering pump No. 5 to automatically adjust its operating frequency, calculating the filter bed dosing flow rate every minute, thus achieving accurate dosing of phosphorus removal chemicals in the filter bed. In practical applications, the calculation time for the filter bed dosing flow rate is set according to the actual situation.

[0058] This invention provides a multi-point intelligent phosphorus removal agent dosing control method. By adding phosphorus removal agents to multiple locations such as the primary sedimentation tank, biological tank, and filter, it achieves automatic start-up and shutdown, automatic flow rate adjustment, and precise dosing of phosphorus removal agents, reducing manual workload. It can accurately control the total phosphorus value of the effluent in the primary sedimentation tank, biological tank, and filter, thereby improving the overall phosphorus removal effect and enabling precise control of effluent water quality to continuously and stably meet discharge standards.

[0059] Example 2

[0060] like Figure 2As shown in another embodiment of the present invention, a control system for multi-point intelligent dosing of phosphorus removal agents is provided, comprising: a parameter acquisition module, a front-end dosing control module, a back-end dosing control module, a feedforward dosing control module, and a filter dosing control module. The parameter acquisition module is used to acquire preset parameters, including: effluent total phosphorus control target value, front-end dosing total phosphorus target value, current effluent total phosphorus value, effective concentration of phosphorus removal agent, minimum dosage of phosphorus removal agent, maximum dosage of phosphorus removal agent, phosphate feedforward early warning value, feedforward dosing correction coefficient, filter dosing total phosphorus target value, minimum filter dosing flow rate, and filter dosing flow rate gradient value. The front-end dosing control module is used to compare the current effluent total phosphorus value with the front-end dosing total phosphorus target value to obtain a comparison result, and control the front-end dosing system at the primary sedimentation tank to operate or stop operating based on the comparison result. The end-point dosing control module calculates the end-point dosing flow rate of the biological tank based on the current total phosphorus value of the effluent, the target total phosphorus value of the effluent, the effective concentration of the phosphorus removal agent, and the minimum dosage value of the phosphorus removal agent. It then controls the end-point dosing device of the biological tank to automatically adjust its stroke based on the end-point dosing flow rate. The feedforward dosing control module obtains multiple phosphate values ​​of the biological tank from the orthophosphate equipment analysis and calculates the average phosphate value. It then calculates the feedforward dosing flow rate based on the average phosphate value, the phosphate feedforward warning value, and the feedforward dosing correction coefficient. It then controls the feedforward dosing device to automatically adjust its stroke based on the feedforward dosing flow rate. The filter dosing control module calculates the filter dosing flow rate based on the current total phosphorus value of the effluent, the target total phosphorus value of the filter dosing, the filter dosing flow rate gradient value, and the minimum dosing flow rate value of the filter. It then controls the filter dosing device to automatically adjust its operating frequency based on the filter dosing flow rate.

[0061] The comparison results include cases where the current effluent total phosphorus value is less than the target value for total phosphorus at the front-end dosing stage and cases where the current effluent total phosphorus value is greater than or equal to the target value for total phosphorus at the front-end dosing stage. The front-end dosing control module includes a control unit. When the current effluent total phosphorus value is less than the target value for total phosphorus at the front-end dosing stage, the control unit stops the front-end dosing system. When the current effluent total phosphorus value is greater than or equal to the target value for total phosphorus at the front-end dosing stage, the control unit starts a diaphragm metering pump in the front-end dosing system and automatically adjusts the frequency to the required operating frequency. Furthermore, it automatically adjusts the operating frequency and starts / stops the diaphragm metering pump based on changes in the current effluent total phosphorus value. The calculation formula for automatically adjusting the operating frequency based on changes in the current effluent total phosphorus value is: Operating frequency = Initial frequency + (Current effluent total phosphorus value - Target value for total phosphorus at the front-end dosing stage) × 100 × Front-end dosing frequency gradient.

[0062] This invention provides a multi-point intelligent phosphorus removal agent dosing control system. By adding phosphorus removal agents to multiple locations such as the primary sedimentation tank, biological tank, and filter, it achieves automatic start-up and shutdown, automatic flow rate adjustment, and precise dosing of phosphorus removal agents, reducing manual workload. It can accurately control the total phosphorus value of the effluent in the primary sedimentation tank, biological tank, and filter, thereby improving the overall phosphorus removal effect and enabling precise control of effluent water quality to continuously and stably meet discharge standards.

[0063] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for controlling the intelligent multi-point dosing of phosphorus removal agents, characterized in that, include: Obtain pre-set parameters, including: effluent total phosphorus control target value, front-end chemical dosing total phosphorus target value, current effluent total phosphorus value, effective concentration of phosphorus removal agent, minimum dosage of phosphorus removal agent, maximum dosage of phosphorus removal agent, phosphate feedforward early warning value, feedforward dosing correction coefficient, filter dosing total phosphorus target value, filter dosing minimum flow rate, and filter dosing flow rate gradient value. The current total phosphorus value of the effluent is compared with the target total phosphorus value of the front-end chemical dosing to obtain the comparison result. Based on the comparison result, the operation or shutdown of the front-end chemical dosing system at the primary sedimentation tank is controlled. The final dosing flow rate of the biological tank is calculated based on the current total phosphorus value of the effluent, the target value of total phosphorus control in the effluent, the effective concentration of the phosphorus removal agent and the minimum dosage value of the phosphorus removal agent. The stroke of the final dosing device of the biological tank is automatically adjusted according to the final dosing flow rate of the biological tank. Phosphate values ​​from multiple biological tanks were obtained from the analysis of orthophosphate equipment, and the average phosphate value was calculated. Based on the average phosphate value, the phosphate feedforward early warning value, and the feedforward dosing correction coefficient, the feedforward dosing flow rate was calculated. The feedforward dosing device was automatically adjusted to control the stroke based on the feedforward dosing flow rate. The filter dosing flow rate is calculated from the current total phosphorus value of the effluent, the target total phosphorus value for filter dosing, the filter dosing flow rate gradient value, and the minimum dosing flow rate value of the filter. The filter dosing device is then automatically adjusted to adjust its operating frequency based on the filter dosing flow rate. The comparison results include cases where the current effluent total phosphorus value is less than the target value for total phosphorus from the front-end chemical dosing and cases where the current effluent total phosphorus value is greater than or equal to the target value for total phosphorus from the front-end chemical dosing. The specific steps of controlling the operation or shutdown of the front-end chemical dosing system at the primary sedimentation tank based on the comparison results include: When the current total phosphorus value in the effluent is lower than the target total phosphorus value for the front-end dosing, the front-end dosing system will be shut down. When the current total phosphorus value of the effluent is greater than or equal to the target value of total phosphorus in the front-end dosing system, the front-end dosing system is controlled to start a diaphragm metering pump and automatically adjust the frequency to reach the required operating frequency. The operating frequency and the start and stop of the diaphragm metering pump are also automatically adjusted according to the change of the current total phosphorus value of the effluent. The parameters also include the front-end dosing frequency gradient, and the calculation formula for automatically adjusting the operating frequency based on the change in the current total phosphorus value of the effluent is as follows: Operating frequency = Starting frequency + (Current total phosphorus value in effluent - Target total phosphorus value for front-end dosing) × 100 × Front-end dosing frequency gradient.

2. The control method for multi-point intelligent dosing of phosphorus removal agents according to claim 1, characterized in that, The formula for calculating the terminal dosing flow rate of the biological treatment tank based on the current total phosphorus value of the effluent, the target total phosphorus value of the effluent, the effective concentration of the phosphorus removal agent, and the minimum dosage of the phosphorus removal agent is as follows: The flow rate of chemical dosing at the end of the biological treatment tank = (current total phosphorus value in the effluent - target total phosphorus control value in the effluent) × 0.1 / effective concentration of phosphorus removal agent + minimum dosage of phosphorus removal agent.

3. The control method for multi-point intelligent dosing of phosphorus removal agents according to claim 2, characterized in that, The specific method for automatically adjusting the stroke of the biological tank terminal dosing device based on the terminal dosing flow rate includes: The flow rate of the biological tank terminal dosing is divided into three parts: one part is added to the first sludge pumping station, and the other two parts are added to the second sludge pumping station. The stroke of the corresponding biological tank terminal dosing device is automatically adjusted according to the flow rate of the biological tank terminal dosing to the first and second sludge pumping stations, and the biological tank terminal dosing flow rate is recalculated within a first set time.

4. The control method for multi-point intelligent dosing of phosphorus removal agents according to claim 1, characterized in that, The formula for calculating the feedforward dosing flow rate based on the average phosphate concentration, the phosphate feedforward early warning value, and the feedforward dosing correction coefficient is as follows: Feedforward dosing flow rate = (mean phosphate value - phosphate feedforward warning value) × feedforward dosing correction coefficient.

5. The control method for multi-point intelligent dosing of phosphorus removal agents according to claim 4, characterized in that, The specific method for automatically adjusting the stroke of the feedforward dosing device based on the feedforward dosing flow rate includes: The feedforward dosing flow rate is divided into three parts: one part is added to the first sludge pumping station, and the other two parts are added to the second sludge pumping station. The corresponding feedforward dosing device is automatically adjusted according to the feedforward dosing flow rate added to the first and second sludge pumping stations, and the feedforward dosing flow rate is recalculated within a second set time.

6. The control method for multi-point intelligent dosing of phosphorus removal agents according to claim 1, characterized in that, The formula for calculating the filter dosing flow rate based on the current total phosphorus value of the effluent, the target total phosphorus value for filter dosing, the filter dosing flow rate gradient, and the minimum filter dosing flow rate is as follows: Filter dosing flow rate = (current total phosphorus value in effluent - target total phosphorus value for filter dosing) × filter dosing flow rate gradient + minimum dosing flow rate for filter.

7. A control system for multi-point intelligent dosing of phosphorus removal agents, characterized in that, The method for implementing the method as described in any one of claims 1-6 includes: a parameter acquisition module, a front-end dosing control module, a back-end dosing control module, a feedforward dosing control module, and a filter dosing control module; The parameter acquisition module is used to acquire pre-set parameters, including: effluent total phosphorus control target value, front-end chemical dosing total phosphorus target value, current effluent total phosphorus value, effective concentration of phosphorus removal agent, minimum dosage of phosphorus removal agent, maximum dosage of phosphorus removal agent, phosphate feedforward early warning value, feedforward dosing correction coefficient, filter dosing total phosphorus target value, filter dosing minimum flow rate, and filter dosing flow rate gradient value. The front-end dosing control module is used to compare the current total phosphorus value of the effluent with the target value of total phosphorus for front-end dosing, obtain the comparison result, and control the front-end dosing system at the primary sedimentation tank to operate or stop operating based on the comparison result. The terminal dosing control module is used to calculate the terminal dosing flow rate of the biological tank based on the current total phosphorus value of the effluent, the target value of total phosphorus control in the effluent, the effective concentration of the phosphorus removal agent, and the minimum dosage value of the phosphorus removal agent, and to control the terminal dosing device of the biological tank to automatically adjust the stroke based on the terminal dosing flow rate of the biological tank. The feedforward dosing control module is used to obtain phosphate values ​​from multiple biological ponds from the orthophosphate equipment analysis, calculate the average phosphate value, calculate the feedforward dosing flow rate based on the average phosphate value, the phosphate feedforward early warning value, and the feedforward dosing correction coefficient, and control the feedforward dosing device to automatically adjust the stroke based on the feedforward dosing flow rate. The filter dosing control module is used to calculate the filter dosing flow rate based on the current total phosphorus value of the effluent, the target total phosphorus value for filter dosing, the filter dosing flow rate gradient value, and the minimum dosing flow rate value of the filter, and to control the filter dosing device to automatically adjust its operating frequency according to the filter dosing flow rate. The comparison results include the current effluent total phosphorus value being less than the target value for total phosphorus at the front-end dosing and the current effluent total phosphorus value being greater than or equal to the target value for total phosphorus at the front-end dosing. The front-end dosing control module includes a control unit. When the current effluent total phosphorus value is less than the target value for total phosphorus at the front-end dosing, the control unit controls the front-end dosing system to stop operating. When the current effluent total phosphorus value is greater than or equal to the target value for total phosphorus at the front-end dosing, the control unit controls the front-end dosing system to start a front-end diaphragm metering pump and automatically adjust the frequency to reach the required operating frequency. Furthermore, the control unit automatically adjusts the operating frequency and starts / stops the front-end diaphragm metering pump based on changes in the current effluent total phosphorus value.

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