Control method and system for multi-point intelligent addition of phosphorus removal agent

Abstract

The invention discloses a control method and system for multi-point intelligent addition of a dephosphorization agent, and the method comprises the steps: obtaining preset parameters, comparing a current effluent total phosphorus value with a front-end dosing total phosphorus target value, and obtaining a comparison result; controlling a front-end dosing system at the primary sedimentation tank to run or stop running according to a comparison result; calculating the dosing flow at the tail end of the biological tank, and controlling a dosing device at the tail end of the biological tank to automatically adjust the stroke according to the dosing flow at the tail end of the biological tank; the feed-forward dosing flow is calculated; controlling the feed-forward dosing device to automatically adjust the stroke according to the feed-forward dosing flow; calculating the filter dosing flow according to the current effluent total phosphorus value, the filter dosing total phosphorus target value, the filter dosing flow gradient value and the filter minimum dosing flow value; and controlling the filter dosing device to automatically adjust the operation frequency according to the filter dosing flow. The method can integrally control the total phosphorus value of the discharged water, improves the phosphorus removal effect of the discharged water, enables the quality of the discharged water to be accurately controlled, and can continuously and stably reach the discharge standard.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and particularly relates to a control method and system for intelligent multi-point dosing of phosphorus removal agents. Background Art

[0002] Currently, in the process of sewage treatment, chemical phosphorus removal is a commonly used treatment method. Existing phosphorus removal agent dosing devices mostly rely on manual operation, and the control of the dosing amount is not precise enough, resulting in waste of agents or poor treatment effects. Although some systems attempt to dose agents through simple automatic control, they lack the ability to dynamically adjust according to real-time water quality data and cannot achieve precise control. Most of them only automatically control the dosing of phosphorus removal agents at a single dosing point, with poor phosphorus removal effect and the water quality not meeting the expected effect. Summary of the Invention

[0003] The purpose of the present invention is to provide a control method and system for intelligent multi-point dosing of phosphorus removal agents, which can automatically and accurately dose phosphorus removal agents at multiple dosing points during the sewage treatment process, improve the phosphorus removal effect of the effluent, save manual workload, and ensure the effluent water quality.

[0004] The present invention is achieved through the following technical solutions:

[0005] In a first aspect, a control method for intelligent multi-point dosing of phosphorus removal agents provided by an embodiment of the present invention includes:

[0006] Obtain pre-set parameters, where the parameters include: 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 dosing amount value of phosphorus removal agent, maximum dosing amount value of phosphorus removal agent, phosphate feed-forward warning value, feed-forward dosing correction coefficient, filter tank dosing total phosphorus target value, minimum dosing flow value of filter tank, and filter tank dosing flow gradient value;

[0007] Compare the current effluent total phosphorus value with the front-end dosing total phosphorus target value to obtain a comparison result, and control the operation or stop of the front-end dosing system at the primary sedimentation tank according to the comparison result;

[0008] Calculate the dosing flow at the end of the biological tank based on the current effluent total phosphorus value, effluent total phosphorus control target value, effective concentration of phosphorus removal agent, and minimum dosing amount value of phosphorus removal agent, and control the automatic adjustment of the stroke of the dosing device at the end of the biological tank according to the dosing flow at the end of the biological tank;

[0009] Obtain multiple biological tank phosphate values from the analysis of the orthophosphate equipment, calculate the phosphate average value, calculate the feed-forward dosing flow based on the phosphate average value, phosphate feed-forward warning value, and feed-forward dosing correction coefficient, and control the automatic adjustment of the stroke of the feed-forward dosing device according to the feed-forward dosing flow;

[0010] Calculate the dosing flow rate of the filter based on the current total phosphorus value of the effluent, the total phosphorus target value of the filter dosing, the flow rate gradient value of the filter dosing, and the minimum dosing flow rate of the filter, and control the operating frequency of the filter dosing device automatically according to the dosing flow rate of the filter.

[0011] Further, the comparison results include that the current total phosphorus value of the effluent is less than the total phosphorus target value of the front-end dosing and the current total phosphorus value of the effluent is greater than or equal to the total phosphorus target value of the front-end dosing. The specific control of the front-end dosing system at the primary sedimentation tank to operate or stop according to the comparison results includes:

[0012] When the current total phosphorus value of the effluent is less than the total phosphorus target value of the front-end dosing, control the front-end dosing system to stop operating;

[0013] When the current total phosphorus value of the effluent is greater than or equal to the total phosphorus target value of the front-end dosing, control the front-end dosing system to start a diaphragm metering pump and automatically adjust the frequency to the required operating frequency, and automatically adjust the operating frequency and start / stop the front-end diaphragm metering pump according to the change of the current total phosphorus value of the effluent.

[0014] Further, the parameter also includes the front-end dosing frequency gradient. The calculation formula for automatically adjusting the operating frequency according to the change of the current total phosphorus value of the effluent is:

[0015] Operating frequency = starting frequency + (current total phosphorus value of the effluent - total phosphorus target value of the front-end dosing) × 100 × front-end dosing frequency gradient.

[0016] Further, the calculation formula for calculating the dosing flow rate at the end of the biological tank based on the current total phosphorus value of the effluent, the total phosphorus control target value of the effluent, the effective concentration of the phosphorus remover, and the minimum dosing amount of the phosphorus remover is:

[0017] Dosing flow rate at the end of the biological tank = (current total phosphorus value of the effluent - total phosphorus control target value of the effluent) × 0.1 / effective concentration of the phosphorus remover + minimum dosing amount of the phosphorus remover.

[0018] Further, the specific method for controlling the automatic adjustment of the stroke of the dosing device at the end of the biological tank according to the dosing flow rate at the end of the biological tank includes:

[0019] Divide the dosing flow rate at the end of the biological tank into 3 parts. The dosing flow rate at the end of the biological tank added to the first sludge pumping station accounts for 1 part, and the dosing flow rate at the end of the biological tank added to the second sludge pumping station accounts for 2 parts. Control the corresponding dosing device at the end of the biological tank to automatically adjust the stroke according to the dosing flow rate at the end of the biological tank added to the first sludge pumping station and the second sludge pumping station, and recalculate the dosing flow rate at the end of the biological tank within the first set time.

[0020] Further, the calculation formula for calculating the feedforward dosing flow rate based on the average value of phosphate, the feedforward warning value of phosphate, and the feedforward dosing correction coefficient is:

[0021] Feed-forward chemical dosing flow = (Average phosphate value - Feed-forward warning value of phosphate) × Feed-forward chemical dosing correction factor.

[0022] Further, the specific method for controlling the automatic stroke adjustment of the feed-forward chemical dosing device according to the feed-forward chemical dosing flow includes:

[0023] Divide the feed-forward chemical dosing flow into 3 parts. The feed-forward chemical dosing flow added to the first sludge pump house accounts for 1 part, and the feed-forward chemical dosing flow added to the second sludge pump house accounts for 2 parts. Control the automatic stroke adjustment of the corresponding feed-forward chemical dosing device according to the feed-forward chemical dosing flow added to the first sludge pump house and the second sludge pump house, and recalculate the feed-forward chemical dosing flow within the second set time.

[0024] Further, the calculation formula for calculating the filter chemical dosing flow according to the current total phosphorus value of the effluent, the total phosphorus target value of the filter chemical dosing, the filter chemical dosing flow gradient, and the minimum filter chemical dosing flow is:

[0025] Filter chemical dosing flow = (Current total phosphorus value of the effluent - Total phosphorus target value of the filter chemical dosing) × Filter chemical dosing flow gradient + Minimum filter chemical dosing flow.

[0026] In a second aspect, a control system for multi-point intelligent dosing of phosphorus removal agents provided by an embodiment of the present invention includes: a parameter acquisition module, a front-end chemical dosing control module, an end chemical dosing control module, a feed-forward chemical dosing control module, and a filter chemical dosing control module;

[0027] The parameter acquisition module is used to acquire pre-set parameters, and the parameters include: Total phosphorus control target value of the effluent, Total phosphorus target value of the front-end chemical dosing, Current total phosphorus value of the effluent, Effective concentration of the phosphorus removal agent, Minimum dosage value of the phosphorus removal agent, Maximum dosage value of the phosphorus removal agent, Feed-forward warning value of phosphate, Feed-forward chemical dosing correction factor, Total phosphorus target value of the filter chemical dosing, Minimum filter chemical dosing flow value, Filter chemical dosing flow gradient value;

[0028] The front-end chemical dosing control module is used to compare the current total phosphorus value of the effluent with the total phosphorus target value of the front-end chemical dosing, obtain a comparison result, and control the operation or stop of the front-end chemical dosing system at the primary sedimentation tank according to the comparison result;

[0029] The end chemical dosing control module is used to calculate the end chemical dosing flow of the biological tank according to the current total phosphorus value of the effluent, the total phosphorus control target value of the effluent, the effective concentration of the phosphorus removal agent, and the minimum dosage value of the phosphorus removal agent, and control the automatic stroke adjustment of the end chemical dosing device of the biological tank according to the end chemical dosing flow of the biological tank;

[0030] The feed-forward chemical dosing control module is used to obtain multiple biological tank phosphate values from the analysis of the orthophosphate equipment, calculate the average phosphate value, calculate the feed-forward chemical dosing flow according to the average phosphate value, the feed-forward warning value of phosphate, and the feed-forward chemical dosing correction factor, and control the automatic stroke adjustment of the feed-forward chemical dosing device according to the feed-forward chemical dosing flow;

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

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

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

[0034] A control method and system for multi-point intelligent dosing of phosphorus removal agents provided by an embodiment of the present invention realizes automatic start and stop and accurate dosing of phosphorus removal agents with automatic flow rate change by dosing phosphorus removal agents at multiple places such as the primary sedimentation tank, the biological tank, and the filter, reduces the manual workload, can accurately control the total phosphorus value of the effluent in the primary sedimentation tank, the biological tank, and the filter, overall control the total phosphorus value of the effluent, improves the phosphorus removal effect of the effluent, enables accurate control of the effluent quality, and can continuously and stably meet the discharge standard. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can also be obtained based on these drawings without creative efforts. In the drawings:

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

[0037] Figure 2 is a structural block diagram of a control system for multi-point intelligent dosing of phosphorus removal agents provided by another embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

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

[0039] Embodiment 1

[0040] As Figure 1 shown, a control method for multi-point intelligent dosing of phosphorus removal agents provided by the first embodiment of the present invention is 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, where the parameters include: the control target value of the total phosphorus in the effluent, the target value of the total phosphorus of the front-end dosing, the current total phosphorus value of the effluent, the effective concentration of the phosphorus removal agent, the minimum dosing amount value of the phosphorus removal agent, the maximum dosing amount value of the phosphorus removal agent, the phosphate feed-forward warning value, the feed-forward dosing correction coefficient, the target value of the total phosphorus of the filter dosing, the minimum dosing flow value of the filter, and the dosing flow gradient value of the filter;

[0042] Compare the current total phosphorus value of the effluent with the target value of the total phosphorus of the front-end dosing to obtain a comparison result, and control the operation or stop of the front-end dosing system at the primary sedimentation tank according to the comparison result;

[0043] Calculate the dosing flow at the end of the biological tank according to the current total phosphorus value of the effluent, the control target value of the total phosphorus in the effluent, the effective concentration of the phosphorus removal agent, and the minimum dosing amount value of the phosphorus removal agent, and control the automatic adjustment of the stroke of the dosing device at the end of the biological tank according to the dosing flow at the end of the biological tank;

[0044] Obtain multiple biological tank phosphate values from the analysis of the orthophosphate equipment, calculate the average phosphate value, calculate the feed-forward dosing flow according to the average phosphate value, the phosphate feed-forward warning value, and the feed-forward dosing correction coefficient, and control the automatic adjustment of the stroke of the feed-forward dosing device according to the feed-forward dosing flow;

[0045] Calculate the dosing flow of the filter according to the current total phosphorus value of the effluent, the target value of the total phosphorus of the filter dosing, the dosing flow gradient value of the filter, and the minimum dosing flow value of the filter, and control the automatic adjustment of the operating frequency of the filter dosing device according to the dosing flow of the filter.

[0046] The user pre-sets corresponding parameters according to actual requirements in advance. The parameters include: the total phosphorus control target value of the effluent, the total phosphorus target value of the front-end dosing, the current total phosphorus value of the effluent, the effective concentration of the phosphorus remover, the minimum dosing amount value of the phosphorus remover, the maximum dosing amount value of the phosphorus remover, the phosphate feed-forward warning value, the feed-forward dosing correction coefficient, the total phosphorus target value of the filter tank dosing, the minimum dosing flow value of the filter tank, the dosing flow gradient value of the filter tank, and the normal upper limit value of phosphate. These parameters will participate in the calculation of other data later. The control method for multi-point intelligent dosing of phosphorus remover includes: the front-end dosing control method, the dosing control method at the end of the biological tank, the feed-forward dosing control method, and the dosing control method of the filter tank.

[0047] Front-end dosing control method:

[0048] The comparison results include that the current total phosphorus value of the effluent is less than the total phosphorus target value of the front-end dosing and the current total phosphorus value of the effluent is greater than or equal to the total phosphorus target value of the front-end dosing. Controlling the operation or stop of the front-end dosing system at the primary sedimentation tank according to the comparison results specifically includes:

[0049] When the current total phosphorus value of the effluent is less than the total phosphorus target value of the front-end dosing, control the front-end dosing system to stop operating;

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

[0051] Specifically, the front-end chemical dosing system includes 3 front-end diaphragm metering pumps. The front-end dosing is carried out by 3 front-end diaphragm metering pumps in the primary sedimentation tank to the well of the primary sedimentation tank for dosing. When the current total phosphorus value of the effluent does not reach the front-end chemical dosing total phosphorus target value, the 3 front-end diaphragm metering pumps in the primary sedimentation tank are in a stopped state. When the current total phosphorus value of the effluent reaches the front-end chemical dosing total phosphorus target value, one front-end diaphragm metering pump will be automatically started and the frequency will be automatically adjusted to the required operating frequency, and the operating frequency of the front-end diaphragm metering pump and the start / stop of the front-end diaphragm metering pump will be automatically adjusted according to the change of the current total phosphorus value of the effluent. When the operation switch of the front-end chemical dosing system is turned on, it is judged every 1 minute whether the current total phosphorus value of the effluent is greater than the front-end chemical dosing total phosphorus target value. If it is greater than or equal to, it is judged the current operating number of the front-end diaphragm metering pumps. If the operating number is 0, it is judged whether there is a front-end diaphragm metering pump in the remote mode. If there is a front-end diaphragm metering pump in the remote mode, one will be turned on. Then it is judged whether the current total phosphorus value of the effluent is lower than the front-end chemical dosing total phosphorus target value. If it is lower, all the front-end diaphragm metering pumps in the remote mode that are running will be turned off. For example, if the front-end chemical dosing total phosphorus target value is 0.31, then when the current total phosphorus value of the effluent is greater than 0.31 and no front-end diaphragm metering pump is running, the system will automatically start one front-end diaphragm metering pump until the current total phosphorus value of the effluent is lower than 0.3, and then turn off all the running front-end diaphragm metering pumps. The parameters also include the front-end chemical dosing frequency gradient. The calculation formula for automatically adjusting the operating frequency according to the change of the current total phosphorus value of the effluent is: operating frequency = starting frequency + (current total phosphorus value of the effluent - front-end chemical dosing total phosphorus target value) × 100 × front-end chemical dosing frequency gradient. The parameters can be adjusted according to the actual situation of the production process.

[0052] Biological pond end chemical dosing control method:

[0053] The dosing at the end of the biological pond is added to the sludge pump house by 4 diaphragm metering pumps in the chemical dosing room, namely No. 1 diaphragm metering pump, No. 2 diaphragm metering pump, No. 3 diaphragm metering pump and No. 4 diaphragm metering pump. Among them, No. 1 diaphragm metering pump and No. 2 diaphragm metering pump are added to No. 1 sludge pump house, and No. 3 and No. 4 diaphragm metering pumps are added to No. 2 sludge pump house. Only one corresponding diaphragm metering pump is required for each sludge pump house for dosing. The dosing method is continuous and uninterrupted, and the diaphragm metering pump is in a normal operating state. The calculation formula for the dosing flow at the end of the biological pond based on the current total phosphorus value of the effluent, the total phosphorus control target value of the effluent, the effective concentration of the phosphorus remover and the minimum dosing amount of the phosphorus remover is: dosing flow at the end of the biological pond = (current total phosphorus value of the effluent - total phosphorus control target value of the effluent) × 0.1 / effective concentration of the phosphorus remover + minimum dosing amount of the phosphorus remover. In this embodiment, since the No. 1 diaphragm metering pump is restricted from working, the dosing flow at the end of the biological pond is divided into 3 parts, with No. 1 sludge pump house accounting for 1 part and No. 2 sludge pump house accounting for 2 parts. According to the dosing flow at the end of the biological pond, the corresponding operating diaphragm metering pump is fed back for automatic stroke adjustment. The dosing flow at the end of the biological pond is calculated every 5 minutes, so as to achieve the accurate dosing of the phosphorus removal agent at the end of the biological pond. In practical applications, the number of parts of the dosing flow at the end of the biological pond and the calculation time of the dosing flow at the end of the biological pond are set according to the actual situation.

[0054] Feedforward dosing control method:

[0055] Obtain the phosphate values of each biological pond from the analysis of the orthophosphate equipment in the biological pond, calculate the average phosphate value according to the phosphate values of each biological pond, and calculate the formula for the feedforward dosing flow according to the average phosphate value, the feedforward dosing warning value and the feedforward dosing correction coefficient: feedforward dosing flow = (average phosphate value - feedforward dosing warning value) × feedforward dosing correction coefficient. According to the feedforward dosing flow, the two diaphragm metering pumps operating in the chemical dosing room are controlled for automatic stroke adjustment dosing. When the average phosphate value is greater than the feedforward dosing warning value, the feedforward dosing control participates in the flow control, otherwise it does not participate. When the average phosphate value exceeds the normal upper limit of phosphate, it is regarded as equipment failure, pipeline blockage, etc., and the flow control is not participated. The feedforward dosing flow is divided into 3 parts, with No. 1 sludge pump house accounting for 1 part and No. 2 sludge pump house accounting for 2 parts. According to the feedforward dosing flow, the corresponding operating diaphragm metering pump is fed back for automatic stroke adjustment. The feedforward dosing flow is calculated every 1 minute, so as to achieve the accurate dosing of the phosphorus removal agent in the feedforward dosing. In practical applications, the number of parts of the feedforward dosing flow and the calculation time of the feedforward dosing flow are set according to the actual situation.

[0056] Filter pond dosing control method:

[0057] The chemical dosing for the filter is added to the filter by a single diaphragm metering pump (No. 5) in the chemical dosing room. When the current total phosphorus value of the effluent does not reach the total phosphorus target value for filter chemical dosing, the No. 5 diaphragm metering pump is in a stopped state. When the current total phosphorus value of the effluent reaches the total phosphorus target value for filter chemical dosing, the No. 5 diaphragm metering pump runs automatically. The calculation formula for the filter chemical dosing flow rate is calculated based on the current total phosphorus value of the effluent, the total phosphorus target value for filter chemical dosing, the filter chemical dosing flow rate gradient, and the minimum filter chemical dosing flow rate: Filter chemical dosing flow rate = (Current total phosphorus value of the effluent - Total phosphorus target value for filter chemical dosing) × Filter chemical dosing flow rate gradient + Minimum filter chemical dosing flow rate. The calculated filter chemical dosing flow rate is fed back to the No. 5 diaphragm metering pump to automatically adjust the operating frequency. The filter chemical dosing flow rate is calculated every 1 minute, so as to achieve the accurate dosing of the phosphorus removal agent in the filter. In practical applications, the time for calculating the filter chemical dosing flow rate is set according to the actual situation.

[0058] A control method for multi-point intelligent dosing of phosphorus removal agents provided by an embodiment of the present invention realizes the automatic start and stop and the accurate dosing of the phosphorus removal agent with automatically changing flow rate by dosing the phosphorus removal agent at multiple places such as the primary sedimentation tank, the biological tank, and the filter, reduces the manual workload, can accurately control the total phosphorus value of the effluent in the primary sedimentation tank, the biological tank, and the filter, overall controls the total phosphorus value of the effluent, improves the phosphorus removal effect of the effluent, enables the accurate control of the effluent water quality, and can continuously and stably meet the discharge standard.

[0059] Example 2

[0060] Such as Figure 2As shown in the figure, a control system for multi-point intelligent dosing of phosphorus removal agents provided by another embodiment of the present invention includes: a parameter acquisition module, a front-end dosing control module, a terminal dosing control module, a feed-forward dosing control module, and a filter dosing control module. The parameter acquisition module is used to acquire preset parameters, and the parameters include: the target value of the total phosphorus in the effluent, the target value of the total phosphorus in the front-end dosing, the current total phosphorus value in the effluent, the effective concentration of the phosphorus removal agent, the minimum dosing amount value of the phosphorus removal agent, the maximum dosing amount value of the phosphorus removal agent, the phosphate feed-forward warning value, the feed-forward dosing correction coefficient, the target value of the total phosphorus in the filter dosing, the minimum dosing flow value of the filter, and the filter dosing flow gradient value. The front-end dosing control module is used to compare the current total phosphorus value in the effluent with the target value of the total phosphorus in the front-end dosing to obtain a comparison result, and control the operation or stop of the front-end dosing system at the primary sedimentation tank according to the comparison result. The terminal dosing control module is used to calculate the dosing flow at the end of the biological tank according to the current total phosphorus value in the effluent, the target value of the total phosphorus in the effluent, the effective concentration of the phosphorus removal agent, and the minimum dosing amount value of the phosphorus removal agent, and control the automatic adjustment of the stroke of the dosing device at the end of the biological tank according to the dosing flow at the end of the biological tank. The feed-forward dosing control module is used to obtain multiple biological tank phosphate values from the analysis of the orthophosphate equipment, calculate the average phosphate value, calculate the feed-forward dosing flow according to the average phosphate value, the phosphate feed-forward warning value, and the feed-forward dosing correction coefficient, and control the automatic adjustment of the stroke of the feed-forward dosing device according to the feed-forward dosing flow. The filter dosing control module is used to calculate the filter dosing flow according to the current total phosphorus value in the effluent, the target value of the total phosphorus in the filter dosing, the filter dosing flow gradient value, and the minimum dosing flow value of the filter, and control the automatic adjustment of the operation frequency of the filter dosing device according to the filter dosing flow.

[0061] The comparison results include that the current total phosphorus value in the effluent is less than the target value of the total phosphorus in the front-end dosing and the current total phosphorus value in the effluent is greater than or equal to the target value of the total phosphorus in the front-end dosing. The front-end dosing control module includes a control unit. When the current total phosphorus value in the effluent is less than the target value of the total phosphorus in the front-end dosing, the control unit controls the front-end dosing system to stop running. When the current total phosphorus value in the effluent is greater than or equal to the target value of the total phosphorus in the front-end dosing, the control unit controls the front-end dosing system to start a diaphragm metering pump and automatically adjust the frequency to reach the required operating frequency, and automatically adjust the operating frequency and start and stop the diaphragm metering pump according to the change of the current total phosphorus value in the effluent. The calculation formula for automatically adjusting the operating frequency according to the change of the current total phosphorus value in the effluent is: operating frequency = starting frequency + (current total phosphorus value in the effluent - target value of the total phosphorus in the front-end dosing) × 100 × front-end dosing frequency gradient.

[0062] A control system for multi-point intelligent dosing of phosphorus removal agents provided by an embodiment of the present invention realizes automatic start-stop and accurate dosing of phosphorus removal agents with automatically varying flow rates by dosing phosphorus removal agents at multiple locations such as primary sedimentation tanks, biological tanks, and filter tanks, reduces the manual workload, can accurately control the total phosphorus value of the effluent in primary sedimentation tanks, biological tanks, and filter tanks, overall controls the total phosphorus value of the effluent, improves the phosphorus removal effect of the effluent, enables accurate control of the effluent water quality, and can continuously and stably meet the discharge standards.

[0063] The specific embodiments described above further elaborate on the purpose, technical solutions, and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A control method for multi-point intelligent dosing of phosphorus removal agents, characterized in that, It includes: Obtain pre-set parameters, where the parameters include: total phosphorus control target value of the effluent, total phosphorus target value of the front-end dosing, current total phosphorus value of the effluent, effective concentration of the phosphorus remover, minimum dosing amount value of the phosphorus remover, maximum dosing amount value of the phosphorus remover, phosphate feed-forward warning value, feed-forward dosing correction coefficient, total phosphorus target value of the filter dosing, minimum dosing flow value of the filter, and filter dosing flow gradient value; Compare the current total phosphorus value of the effluent with the total phosphorus target value of the front-end dosing to obtain a comparison result, and control the operation or stop of the front-end dosing system at the primary sedimentation tank according to the comparison result; Calculate the dosing flow at the end of the biological tank based on the current total phosphorus value of the effluent, total phosphorus control target value of the effluent, effective concentration of the phosphorus remover, and minimum dosing amount value of the phosphorus remover, and control the automatic adjustment of the stroke of the dosing device at the end of the biological tank according to the dosing flow at the end of the biological tank; Obtain multiple biological tank phosphate values from the orthophosphate equipment analysis, calculate the average phosphate value, calculate the feed-forward dosing flow according to the average phosphate value, phosphate feed-forward warning value, and feed-forward dosing correction coefficient, and control the automatic adjustment of the stroke of the feed-forward dosing device according to the feed-forward dosing flow; Calculate the filter dosing flow based on the current total phosphorus value of the effluent, total phosphorus target value of the filter dosing, filter dosing flow gradient value, and minimum dosing flow value of the filter, and control the automatic adjustment of the operating frequency of the filter dosing device according to the filter dosing flow.

2. The control method for multi-point intelligent dosing of phosphorus-removing agents according to claim 1, characterized in that The comparison result includes that the current total phosphorus value of the effluent is less than the total phosphorus target value of the front-end dosing and the current total phosphorus value of the effluent is greater than or equal to the total phosphorus target value of the front-end dosing. The control of the operation or stop of the front-end dosing system at the primary sedimentation tank according to the comparison result specifically includes: When the current total phosphorus value of the effluent is less than the total phosphorus target value of the front-end dosing, control the front-end dosing system to stop operating; When the current total phosphorus value of the effluent is greater than or equal to the total phosphorus target value of the front-end dosing, control the front-end dosing system to start a diaphragm metering pump and automatically adjust the frequency to reach the required operating frequency, and automatically adjust the operating frequency and start / stop the diaphragm metering pump according to the change of the current total phosphorus value of the effluent.

3. The control method for multi-point intelligent dosing of phosphorus removal agent according to claim 2, characterized in that, The parameter also includes the front-end dosing frequency gradient. The calculation formula for automatically adjusting the operating frequency according to the change of the current total phosphorus value of the effluent is: Operating frequency = starting frequency + (current total phosphorus value of the effluent - total phosphorus target value of the front-end dosing) × 100 × front-end dosing frequency gradient.

4. The control method for multi-point intelligent dosing of phosphorus removal agents according to claim 1, characterized in that, The calculation formula for calculating the dosing flow at the end of the biological tank based on the current total phosphorus value of the effluent, total phosphorus control target value of the effluent, effective concentration of the phosphorus remover, and minimum dosing amount value of the phosphorus remover is: Dosing flow at the end of the biological tank = (current total phosphorus value of the effluent - total phosphorus control target value of the effluent) × 0.1 / effective concentration of the phosphorus remover + minimum dosing amount of the phosphorus remover.

5. The control method for multi-point intelligent dosing of phosphorus removal agent according to claim 4, characterized in that, The specific method for controlling the automatic adjustment of the stroke of the dosing device at the end of the biological tank according to the dosing flow at the end of the biological tank includes: Divide the dosing flow at the end of the biological tank into 3 parts. The dosing flow at the end of the biological tank added to the first sludge pump house accounts for 1 part, and the dosing flow at the end of the biological tank added to the second sludge pump house accounts for 2 parts. Control the corresponding dosing device at the end of the biological tank to automatically adjust the stroke according to the dosing flow at the end of the biological tank added to the first sludge pump house and the second sludge pump house, and recalculate the dosing flow at the end of the biological tank within the first set time.

6. The control method for multi-point intelligent dosing of phosphorus removal agents according to claim 1, characterized in that, The calculation formula for the feed dosing flow rate calculated based on the phosphate mean value, the phosphate feed warning value, and the feed dosing correction coefficient is as follows: Feed dosing flow rate = (Phosphate mean value - Phosphate feed warning value) × Feed dosing correction coefficient.

7. The control method for multi-point intelligent dosing of phosphorus removal agents according to claim 6, characterized in that, The specific method for controlling the automatic adjustment of the stroke of the feed dosing device according to the feed dosing flow rate includes: Dividing the feed dosing flow rate into three parts, with the feed dosing flow rate added to the first sludge pump house accounting for one part, and the feed dosing flow rate added to the second sludge pump house accounting for two parts. Controlling the automatic adjustment of the stroke of the corresponding feed dosing device according to the feed dosing flow rates added to the first sludge pump house and the second sludge pump house, and recalculating the feed dosing flow rate within the second set time.

8. The control method for multi-point intelligent dosing of phosphorus removal agent according to claim 1, characterized in that, The calculation formula for the filter dosing flow rate calculated based on the current total phosphorus value of the effluent, the total phosphorus target value of 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 of the effluent - Total phosphorus target value of filter dosing) × Filter dosing flow rate gradient + Minimum filter dosing flow rate.

9. A control system for multi-point intelligent dosing of phosphorus removal agents, characterized in that, Including: A parameter acquisition module, a front-end dosing control module, a terminal dosing control module, a feed dosing control module, and a filter dosing control module; The parameter acquisition module is used to acquire pre-set parameters, and the parameters include: the total phosphorus control target value of the effluent, the total phosphorus target value of front-end dosing, the current total phosphorus value of the effluent, the effective concentration of the dephosphorizer, the minimum dosing amount value of the dephosphorizer, the maximum dosing amount value of the dephosphorizer, the phosphate feed warning value, the feed dosing correction coefficient, the total phosphorus target value of filter dosing, the minimum filter dosing flow rate value, and the 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 total phosphorus target value of front-end dosing to obtain a comparison result, and control the operation or stop of the front-end dosing system at the primary sedimentation tank according to the comparison result; The terminal dosing control module is used to calculate the dosing flow rate at the end of the biological tank based on the current total phosphorus value of the effluent, the total phosphorus control target value of the effluent, the effective concentration of the dephosphorizer, and the minimum dosing amount value of the dephosphorizer, and control the automatic adjustment of the stroke of the dosing device at the end of the biological tank according to the dosing flow rate at the end of the biological tank; The feed dosing control module is used to obtain multiple biological tank phosphate values from the orthophosphate equipment analysis, calculate the phosphate mean value, calculate the feed dosing flow rate based on the phosphate mean value, the phosphate feed warning value, and the feed dosing correction coefficient, and control the automatic adjustment of the stroke of the feed dosing device according to the feed 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 total phosphorus target value of filter dosing, the filter dosing flow rate gradient value, and the minimum filter dosing flow rate value, and control the automatic adjustment of the operating frequency of the filter dosing device according to the filter dosing flow rate.

10. The control system for multi-point intelligent dosing of phosphorus removal agents according to claim 9, characterized in that, The comparison results include that the current total phosphorus value of the effluent is less than the total phosphorus target value of the front-end dosing, and the current total phosphorus value of the effluent is greater than or equal to the total phosphorus target value of the front-end dosing. The front-end dosing control module includes a control unit. When the current total phosphorus value of the effluent is less than the total phosphorus target value of the front-end dosing, the control unit controls the front-end dosing system to stop running. When the current total phosphorus value of the effluent is greater than or equal to the total phosphorus target value of the front-end dosing, the control unit controls the front-end dosing system to start a front-end diaphragm metering pump and automatically adjusts the frequency to the required operating frequency, and automatically adjusts the operating frequency and starts and stops the front-end diaphragm metering pump according to the change of the current total phosphorus value of the effluent.

Images