PLC-based dosing control system for sewage treatment

Abstract

The invention provides a PLC-based dosing control system for sewage treatment. The system comprises a power supply module, a data acquisition module, an Internet of Things communication module, a processor module, a dosing control module and a central control system module which are connected in sequence, wherein the data acquisition module is used for acquiring the water inflow of sewage and various water quality parameters in the sewage treatment process and the sewage discharge process; the Internet of Things communication module is used for realizing communication interaction of the dosing control system; the processor module is used for analyzing the water inflow and various water quality parameters based on the PLC, and calculating the dosing amount and adjusting the dosing control parameters in cooperation with the dosing control module according to the analysis result; and the central control system module is used for dynamically displaying sewage treatment related data and interacting with workers. According to the system, the overall operation efficiency of the dosing system is improved, the operation difficulty of operators is reduced, and the dosing accuracy and convenience during sewage treatment are improved.

Description

Technical Field

[0001] The present application relates to the technical field of sewage treatment, and in particular to a PLC-based sewage treatment dosing control system. Background Art

[0002] At present, sewage treatment systems are widely used in various fields of industry and agriculture. The system is of great significance to improving the ecological environment and promoting sustainable development. The sewage treatment system is a collection of facilities and equipment used to treat and purify sewage. Its main purpose is to remove harmful substances in sewage, reduce pollution to the environment, protect water resources, and recycle and reuse water resources. The system also includes a collection subsystem, which is responsible for collecting sewage such as domestic, industrial and rainwater, and transporting it to the sewage treatment plant through pipelines.

[0003] Since the sewage treatment system is an important facility for protecting water resources and improving the ecological environment, it is of great significance to achieve sustainable development and build ecological civilization. Therefore, the effect and efficiency of sewage treatment are increasingly attracting people's attention. With the advancement of various technologies and the increasing shortage of water resources, sewage treatment technology is also constantly improving and innovating to cope with the increasingly severe water resource challenges. At present, it is necessary to add chemicals to the sewage during the sewage treatment process, such as adding chemical agents such as PAC and PAM, to achieve the decontamination effect through a series of related chemical reactions.

[0004] In the related art, the dosing process of common dosing control systems needs to be done manually during use, and the staff adds the reagents based on their personal experience and predetermined ratios, which makes the dosing process more complicated, the operation is less convenient, and there is a deviation between the amount of dosing and the actual demand, which affects the decontamination effect. Summary of the invention

[0005] The present application aims to solve one of the technical problems in the related art at least to some extent.

[0006] To this end, the first purpose of this application is to propose a PLC-based dosing control system for sewage treatment, which improves the overall operating efficiency of the dosing system, reduces the operating difficulty of operators, and improves the accuracy and convenience of sewage treatment dosing.

[0007] To achieve the above-mentioned purpose, the embodiment of the present application is to propose a PLC-based dosing control system for sewage treatment, the system comprising: a power supply module, a data acquisition module, an Internet of Things communication module, a processor module, a dosing control module and a central control system module connected in sequence, the dosing control module comprising a dosing parameter analysis module, a dosing phosphorus removal control module, an aeration flow control module and a dosing amount adjustment module; wherein,

[0008] The power supply module is used to supply power to each module in the dosing control system;

[0009] The data acquisition module is used to collect the sewage inflow volume and various water quality parameters during the sewage treatment process and the discharge process;

[0010] The Internet of Things communication module includes data transmission equipment, information control equipment and various equipment at the sewage treatment site, and the Internet of Things communication module is used to realize the communication interaction of the dosing control system;

[0011] The processor module is used to analyze the water intake and the multiple water quality parameters based on PLC, and coordinate with the dosing control module to calculate the dosing amount and adjust the dosing control parameters according to the analysis results;

[0012] The central control system module is used to dynamically display sewage treatment related data and interact with staff.

[0013] Optionally, in one embodiment of the present application, the data acquisition module includes: a pH sensor, which is used to monitor the pH value of water quality during sewage treatment and discharge; a chemical oxygen demand COD sensor, which is used to detect the mass of reducing substances that need to be oxidized during sewage treatment; a polycyclic aromatic hydrocarbons PAH content sensor, which is used to measure the content of polycyclic aromatic hydrocarbons in sewage.

[0014] Optionally, in one embodiment of the present application, the Internet of Things communication module includes: an information layer, the information layer includes multiple monitoring and management devices during the communication process of the dosing control system; a control layer, the control layer includes a field control substation and an industrial Ethernet switch; a device layer, the device layer includes the control device in the field control substation, as well as multiple data detection devices and multiple dosing execution devices at the sewage treatment site.

[0015] Optionally, in one embodiment of the present application, the processor module includes: a PLC control cabinet, an uninterruptible power supply UPS, an industrial operation panel, an Ethernet switch and a lightning protection device. The processor module is configured with application programs corresponding to multiple sewage treatment equipment. The processor module is specifically used to: receive data collected by multiple data detection devices at the sewage treatment site, and send the calculated dosage to the multiple dosage execution devices, and respectively control the operating parameters of each of the dosage execution devices.

[0016] Optionally, in one embodiment of the present application, the output data of the dosing control module is determined based on the outputs of the dosing parameter analysis module, the dosing and phosphorus removal control module, the aeration flow control module and the dosing adjustment module, and the dosing parameter analysis module is specifically used to: generate a corresponding relationship between the dosing amount and a plurality of pre-parameters based on historical dosing data; substitute a plurality of water quality parameters and pre-parameters detected in real time into the corresponding relationship to obtain preset control parameters for determining the dosing amount.

[0017] Optionally, in one embodiment of the present application, the dosing and phosphorus removal control module is specifically used to: use the water intake and the multiple water quality parameters as input signals, simulate the reaction process of removing multiple harmful substances in the sewage treatment process through a fuzzy PID algorithm, and obtain the distribution state and change status of the concentration of multiple material indicators. The calculation results; according to the calculation results, the preset control parameters are corrected to correct the calculated dosage.

[0018] Optionally, in one embodiment of the present application, the aeration flow control module is specifically used to: calculate the air demand according to the water inflow and the multiple water quality parameters; and automatically control the aeration flow according to the air demand.

[0019] Optionally, in one embodiment of the present application, the dosage adjustment module includes: a dosage setting adjustment module, which is used to adjust the pre-parameters and the preset control parameters according to the deviation of the water quality parameter parameters detected in real time in the effluent; a dosage feedback adjustment module, which is used to quickly and continuously adjust the real-time agent dosage according to the water intake based on the speed regulation mechanism of the frequency converter and the automatic control mechanism of the PLC, so as to match the actual dosage with the set value.

[0020] Optionally, in one embodiment of the present application, the central control system module includes: 1 display screen and control computer, 1 communication management machine, 2 network printers, 5 operation stations, 2 engineer stations, 2 data servers, SCADA monitoring software and data platform.

[0021] Optionally, in one embodiment of the present application, the central control system module is specifically used to: dynamically display real-time sewage treatment images, the working status of each device and various water quality parameters through the display screen, and when a fault occurs, record the monitored fault according to a preset priority level and issue an audible and visual alarm; based on the human-computer interaction interface, provide the staff with sewage treatment summary data and comprehensive evaluation data on the sewage treatment effect of the dosing control system.

[0022] The technical solution provided by the embodiment of the present application brings at least the following beneficial effects: when the dosing control module of the present application is running, the dosing amount can be analyzed by PLC to analyze the water flow signal, determine the required amount of medicine according to the set dosing ratio, and then send the required amount signal to the relevant dosing execution equipment for dosing, so as to achieve the reasonable distribution of the dosing amount. Thus, the present application improves the overall operation efficiency of the dosing system, reduces the difficulty of operation of the operators, and brings more convenience to the dosing process of sewage treatment. In addition, the central control system module of the present application can dynamically display the sewage treatment screen, the working status of each device and the real-time data of each parameter, record the monitored faults according to the priority level and make sound and light alarms, and then use its remote control function to directly switch or adjust the working equipment, and continuously record the relevant parameter data, which is convenient for the subsequent query link on the one hand, and can be used for the comprehensive evaluation of the system on the other hand to achieve the prediction effect, with high openness and flexibility, and integrated complex control strategies. Among them, the operation station can provide a clear human-machine interface, centrally manage the collected data, and complete the daily, monthly and annual reports of production management with high accuracy, reduce the burden on the staff, and effectively improve the work efficiency. Therefore, the present application improves the accuracy and convenience of adding drugs when treating sewage.

[0023] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0025] Figure 1 This is a schematic diagram of the structure of a PLC-based sewage treatment dosing control system proposed in an embodiment of the present application;

[0026] Figure 2 A schematic diagram of the structure of a dosing control module proposed in an embodiment of the present application; DETAILED DESCRIPTION

[0027] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0028] A PLC-based sewage treatment dosing control system according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

[0029] Figure 1This is a schematic diagram of a PLC-based sewage treatment dosing control system proposed in the embodiment of the present application, as shown in FIG. Figure 1 As shown, the dosing control system includes: a power supply module 1, a data acquisition module 2, an Internet of Things communication module 3, a processor module 4, a dosing control module 5 and a central control system module 6 connected in sequence, wherein the dosing control module 5 includes a dosing amount parameter analysis module 7, a dosing phosphorus removal control module 8, an aeration flow control module 9 and a dosing amount adjustment module 10.

[0030] Among them, the various modules in the above-mentioned dosing control system are connected in sequence, which means that the output end of the power supply module 1 is connected to the input end of the data acquisition module 2, the output end of the data acquisition module 2 is connected to the input end of the Internet of Things communication module 3, the output end of the Internet of Things communication module 3 is connected to the input end of the processor module 4, the output end of the processor module 4 is connected to the input end of the dosing control module 5, and the output end of the dosing control module 5 is connected to the input end of the central control system module 6.

[0031] Among them, the dosing control module 5 is internally provided with a dosing parameter analysis module 7, a dosing phosphorus removal control module 8, an aeration flow control module 9 and a dosing amount adjustment module 10, and the output data of the dosing control module 5 is jointly determined according to the outputs of the dosing parameter analysis module 7, the dosing phosphorus removal control module 8, the aeration flow control module 9 and the dosing amount adjustment module 10.

[0032] Specifically, the power supply module 1 is used to supply power to each module in the dosing control system, that is, to supply power to each module other than the power supply module 1 in the dosing control system, so that each module can be powered on and operate.

[0033] The data acquisition module 2 is used to collect the inflow volume of sewage and various water quality parameters during sewage treatment and discharge, including the detection of water quality parameters in the inflow sewage to be treated.

[0034] The Internet of Things communication module 3 includes data transmission equipment, information control equipment and various equipment at the sewage treatment site. The Internet of Things communication module 3 is used to realize the communication interaction of the dosing control system.

[0035] The processor module 4 is used to analyze the water intake and the multiple water quality parameters based on the PLC, and calculate the dosage and adjust the dosage control parameters in cooperation with the dosage control module 5 according to the analysis results. For example, the adjusted dosage control parameters include adjusting the pre-parameters and the preset control parameters.

[0036] The central control system module 6 is used to dynamically display sewage treatment related data and interact with staff.

[0037] The following is a detailed description of each module in the PLC-based sewage treatment dosing control system.

[0038] In one embodiment of the present application, the data acquisition module 2 includes:

[0039] PH sensor: PH sensor is used to monitor the PH value of water quality during sewage treatment and discharge.

[0040] Chemical oxygen demand (COD) sensor, COD sensor is used to detect the quality of reducing substances that need to be oxidized during sewage treatment.

[0041] Polycyclic aromatic hydrocarbons (PAH) content sensor: PAH content sensor is used to measure the content of polycyclic aromatic hydrocarbons in sewage.

[0042] Specifically, in this embodiment, a pH sensor is provided inside the data acquisition module 2. In order to ensure that the pH value of the discharged sewage meets the requirements, taking the sewage discharged from ships as an example, the pH value of the water quality is monitored during the entire sewage treatment and discharge process. The pH sensor measures the pH value of the solution by measuring the potential difference between the reference electrode and the measuring electrode. The pH sensor model selected by the data acquisition module 2 can be determined according to actual needs such as the measurement range and accuracy. For example, the selected pH sensor can measure a range of 0 to 14.

[0043] A chemical oxygen demand (COD) sensor is also provided inside the data acquisition module 2. The COD sensor can be used to measure the mass of reducing substances that need to be oxidized during the ship sewage treatment process. The data acquisition module 2 can use the AMT-COD300 sensor, which uses a dual-wavelength ultraviolet absorption method with a measurement accuracy of ±5% FS. A polycyclic aromatic hydrocarbon (PAH) content sensor is also provided inside the data acquisition module 2 to measure the content of polycyclic aromatic hydrocarbons in ship sewage. For example, the data acquisition module 2 selects the CFS51 sensor, which is a sensor specially designed for ship sewage treatment and discharge, and has the advantages of high measurement accuracy and good stability.

[0044] In one embodiment of the present application, the Internet of Things communication module 3 includes: an information layer, the information layer includes multiple monitoring and management devices in the communication process of the dosing control system; a control layer, the control layer includes a field control substation and an industrial Ethernet switch; a device layer, the device layer includes the control device in the field control substation, as well as multiple data detection devices and multiple dosing execution devices at the sewage treatment site.

[0045] Specifically, in this embodiment, the Internet of Things communication module 3 is composed of an information layer, a control layer, and a device layer, and the three layers work together to realize various data interactions in the dosing control system. Among them, the monitoring and management equipment in the information layer includes but is not limited to: computers, data servers, portable computers, industrial Ethernet switches, network printers and other equipment for realizing the monitoring and management functions of data interaction.

[0046] The control layer includes the field control substation and industrial Ethernet switch of the sewage treatment site. The transmission medium in this layer adopts single-mode optical cable to realize communication interaction between each layer. It has the advantages of low loss, high confidentiality and low bit error rate, and has strong anti-electromagnetic interference ability.

[0047] The equipment layer includes various control devices and various detection instruments in the sewage treatment site. For example, each control device can be various devices controlled by the control substation, and various detection instruments can be various water quality parameter detection devices in the data acquisition module 2. It can also include various parameter detection devices such as parameter detection devices in various reaction tanks and detection devices of various intermediate parameters in the sewage treatment process. Each field control device and various detection instruments can be connected to the field control substation using a fieldbus communication method based on the IEC61158 standard.

[0048] In one embodiment of the present application, the processor module 4 includes: various PLC devices, PLC control cabinets, uninterruptible power supply UPS, industrial operation screens, Ethernet switches and lightning protection devices. The processor module is configured with application programs corresponding to multiple sewage treatment equipment. The processor module is specifically used to: receive data collected by multiple data detection devices at the sewage treatment site, and send the calculated dosage to multiple dosage execution devices, and respectively control the operating parameters of each dosage execution device.

[0049] Specifically, in this embodiment, the processor module 4 can select a PLC of a model such as PLCS7-1500 as a controller according to actual needs. Since the CASS pool is required to carry out a continuous water inflow and intermittent drainage process in the sewage treatment process, the CASS pool is composed of a biological selection pool, a main reaction pool and an aeration system. For this process, a blower, a plug flow agitator, a sludge return pump, an air intake valve and other sewage treatment equipment are required. In this embodiment, various applications are configured in the PLC of the processor module 4 to control and monitor the corresponding equipment.

[0050] Among them, PLC, as a higher-level main control device, integrates computer technology, semiconductor integration technology, digital control technology and communication network technology. It calculates the actual required control quantity by receiving the signals transmitted by the on-site equipment and transmits it back to the on-site actuator, giving full play to the sequential and logical control functions.

[0051] For example, when determining the dosage, the water flow signal can be analyzed by PLC, including the collected water flow and various water quality parameters. After the dosage is determined in coordination with the dosing control module 5 according to the analysis results, the required dosage signal is sent to each dosing execution device, for example, to the dosing pump main control cabinet MCP, and the operation frequency of the dosing pump is set according to the flow-frequency characteristics of the dosing pump, thereby adjusting the total dosage of the structure, and the valve opening on the dosing pipeline can also be adjusted to achieve a reasonable distribution of the dosage. In this way, the adjustment of various operating parameters of each dosing execution device is achieved.

[0052] In one embodiment of the present application, Figure 2 As shown, the overall output end of the dosing parameter analysis module 7, the dosing phosphorus removal control module 8, the aeration flow control module 9 and the dosing adjustment module 10 is connected to the output end of the dosing control module 5, and each module can call the parameter analysis results, related programs and computing resources in the PLC to perform its own functions to collaboratively calculate the required dosing amount. Among them, the dosing parameter analysis module 7 is specifically used to: generate the corresponding relationship between the dosing amount and multiple pre-set parameters based on historical dosing data; substitute multiple water quality parameters and pre-set parameters detected in real time into the corresponding relationship to obtain the preset control parameters for determining the dosing amount.

[0053] Specifically, in this embodiment, the water quality parameters analyzed by the dosage parameter analysis module 7 include chemical oxygen demand (COD), total nitrogen (TN), total phosphorus (TP) and suspended solids (SS) in the influent, and the pre-parameters include parameters processed in pre-reaction tanks such as sand adding tanks before adding drugs. For example, the pre-parameters may include values ​​such as the turbidity of the effluent from the secondary sedimentation tank, the water volume of the influent from the sand adding tank, the turbidity of the effluent from the sand adding tank, the dosage of polyaluminium chloride (PAC) and the dosage of polyacrylamide (PAM). The dosage parameter analysis module 7 quantifies the influence of different pre-parameters on the dosage according to the change relationship between the historical dosage and the above-mentioned pre-parameters, and fits and generates a mapping curve between the pre-parameter and the dosage. Then obtain the above-mentioned water quality parameters and pre-parameters detected in real time, substitute the real-time data into the relationship curve, and generate an initial control parameter suitable for determining the dosage required for the current sewage treatment scene, that is, the preset control parameter. In the subsequent process, the preset control parameter can be adjusted according to the feedback of the sewage treatment effect. The preset control parameters can be used to calculate the total dosage required, as well as the dosage in different time periods, and determine the dosage added to the main reaction tank in different dosing rounds.

[0054] In one embodiment of the present application, the dosing and phosphorus removal control module 8 is specifically used to: use the water intake and multiple water quality parameters as input signals, simulate the reaction process of removing multiple harmful substances in the sewage treatment process through the fuzzy PID algorithm, and obtain the distribution state and change status of the concentration of multiple material indicators; modify the preset control parameters according to the calculation results to adjust the calculated dosage.

[0055] Specifically, in this embodiment, the dosing and phosphorus removal control module 8 adopts a multi-parameter control mode based on a fuzzy PID algorithm to achieve fully automatic refined control. In the dosing system, this module uses the water quality and water volume of the sewage plant inlet as input signals, simulates the carbon oxidation, ammonia nitrogen nitrification, nitrate denitrification and phosphorus removal of the CASS pool and other related reactions to remove multiple harmful substances, and calculates the concentration of dissolved oxygen, ammonia nitrogen, nitrate nitrogen, phosphorus and MLSS in the biological pool in real time according to the inlet flow rate and the inlet pollutant concentration, and tracks its changes in time and space. Then, relying on the above information calculated (including the reaction simulation results, the distribution state and changes of the indicators), the dosage is accurately calculated, including the preset control parameters obtained by the dosage parameter analysis module 7 according to the calculation results of this module. Correction, so that the preliminary calculated dosage can be further corrected to improve the accuracy of the required dosage calculation results.

[0056] In one embodiment of the present application, the aeration flow control module 9 is specifically used to: calculate the required air volume according to the water inflow and various water quality parameters; and automatically control the aeration flow according to the required air volume. Specifically, in this embodiment, the aeration flow control module 9 transmits control and auxiliary signals based on the detection data of the thermal gas flow meter and the dissolved oxygen meter, and then calculates the required air volume in real time according to the water inflow and water quality of the sewage treatment plant, so as to realize the automatic control of the aeration flow. For example, during operation, the staff can set any value between 0.5 and 5.0 mg / L, and the control accuracy is ±0.3 mg / L, to ensure the rapid response of the system.

[0057] In one embodiment of the present application, the dosage adjustment module 10 includes: a dosage setting adjustment module, which is used to adjust the pre-parameters and preset control parameters according to the deviation of the water quality parameter parameters in the real-time detected effluent water; a dosage feedback adjustment module, which is used to quickly and continuously adjust the real-time agent dosage according to the water inlet volume based on the speed regulation mechanism of the frequency converter and the automatic control mechanism of the PLC, so as to match the actual dosage with the set value.

[0058] Specifically, in this embodiment, the dosage setting and adjustment module can be used to adjust the pre-parameters and the preset control parameters. Under the real-time data feedback, the pre-parameters are changed accordingly, for example, the dosage required for the sand adding pool can be adjusted. In addition, the preset control parameters can be adjusted according to the effluent water quality after sewage treatment, for example, according to the deviation and deviation change rate between the content of substances such as TP and SS contained in the effluent and the expected standard content in the treated sewage. In order to adjust the dosage of the added medicine, a more accurate and reasonable dosage is obtained, and the sewage treatment effect is improved.

[0059] The dosing amount feedback adjustment module uses the speed regulation mechanism of the frequency converter of some dosing execution equipment and the automatic control mechanism of PLC to achieve rapid and continuous adjustment of the dosage of PAC, PAM and other agents according to the amount of water inlet, so that the actual dosage changes in line with the set value. Therefore, through the adjustment mechanism of the dosing amount feedback adjustment module, the stability of the dosing process and the accuracy of the actual dosage can be improved, and the deviation in the dosing process can be reduced.

[0060] In one embodiment of the present application, the central control system module 6 includes: 1 display screen and control computer, 1 communication management machine, 2 network printers, 5 operation stations, 2 engineer stations, 2 data servers, SCADA monitoring software and data platform. The central control system module is specifically used to: dynamically display the real-time sewage treatment screen, the working status of each device and each water quality parameter through the display screen, and when a fault occurs, record the monitored fault according to the preset priority level and issue an audible and visual alarm;

[0061] Based on the human-computer interaction interface, it provides the staff with sewage treatment summary data and comprehensive evaluation data on the sewage treatment effect of the dosing control system.

[0062] Specifically, the central control system module in the embodiment of the present application can dynamically display the sewage treatment screen, the working status of each device, and the real-time data of each parameter. The displayed parameters include the parameters detected by the detection equipment, the dosage and dosing control parameters calculated by the system, and the sewage treatment process data at each stage, etc. In addition, the monitored faults can be recorded according to the priority level and sound and light alarms can be issued, and then the remote control function can be used to directly switch or adjust the working equipment, so as to gradually eliminate the faults in a way that prioritizes the serious faults.

[0063] The central control system module 6 in this embodiment can also continuously record relevant parameter data, which is convenient for subsequent query links on the one hand, and can be used for comprehensive evaluation of the system on the other hand to achieve prediction effects, with high openness and flexibility, and integrate complex control strategies. Among them, the operation station can provide a clear human-machine interface, centrally manage the collected data, and complete the comprehensive evaluation data such as daily, monthly and annual reports of production management with high accuracy, reducing the burden on staff and effectively improving work efficiency.

[0064] In summary, in the PLC-based sewage treatment dosing control system of this embodiment, when the dosing control module is running, the dosing amount can be analyzed by PLC to analyze the water flow signal, determine the required amount of medicine according to the set dosing ratio, and then send the required amount signal to the relevant dosing execution equipment for dosing, so as to achieve the reasonable distribution of the dosing amount. Thus, the present application improves the overall operating efficiency of the dosing system, reduces the operating difficulty of the operators, and brings more convenience to the dosing process of sewage treatment. In addition, the central control system module of the present application can dynamically display the sewage treatment status and record historical treatment data, which is convenient for subsequent data query and comprehensive evaluation of the system, and achieves prediction effect. It has high openness and flexibility, and integrates complex control strategies. Among them, the operation station can provide a clear human-machine interface, centrally manage the collected data, provide comprehensive evaluation data of different time dimensions to the staff, and effectively improve work efficiency. As a result, the present application improves the accuracy and convenience of dosing when treating sewage.

[0065] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0066] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0067] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0068] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0069] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A PLC-based sewage treatment dosing control system, characterized in that: include: A power supply module, a data acquisition module, an Internet of Things communication module, a processor module, a dosing control module and a central control system module are connected in sequence, wherein the dosing control module includes a dosing parameter analysis module, a dosing phosphorus removal control module, an aeration flow control module and a dosing adjustment module; wherein, The power supply module is used to supply power to each module in the dosing control system; The data acquisition module is used to collect the sewage inflow volume and various water quality parameters during the sewage treatment process and the discharge process; The Internet of Things communication module includes data transmission equipment, information control equipment and various equipment at the sewage treatment site, and the Internet of Things communication module is used to realize the communication interaction of the dosing control system; The processor module is used to analyze the water intake and the multiple water quality parameters based on PLC, and coordinate with the dosing control module to calculate the dosing amount and adjust the dosing control parameters according to the analysis results; The central control system module is used to dynamically display sewage treatment related data and interact with staff.

2. The PLC-based sewage treatment dosing control system according to claim 1 is characterized in that: The data acquisition module comprises: A pH sensor is used to monitor the pH value of water quality during sewage treatment and discharge; A chemical oxygen demand (COD) sensor, which is used to detect the mass of reducing substances that need to be oxidized during sewage treatment; A polycyclic aromatic hydrocarbon (PAH) content sensor is used to measure the content of polycyclic aromatic hydrocarbons in sewage.

3. The PLC-based sewage treatment dosing control system according to claim 1 is characterized in that: The Internet of Things communication module comprises: An information layer, the information layer including a plurality of monitoring and management devices during the communication process of the dosing control system; A control layer, comprising a field control substation and an industrial Ethernet switch; The equipment layer includes the control equipment in the field control substation, as well as a plurality of data detection equipment and a plurality of dosing execution equipment at the sewage treatment site.

4. The PLC-based sewage treatment dosing control system according to claim 3 is characterized in that: The processor module includes: a PLC control cabinet, an uninterruptible power supply UPS, an industrial operation screen, an Ethernet switch and a lightning protection device. The processor module is configured with application programs corresponding to multiple sewage treatment equipment. The processor module is specifically used for: The data collected by the multiple data detection devices at the sewage treatment site are received, and the calculated dosage is sent to the multiple dosage execution devices, and the operation parameters of each of the dosage execution devices are controlled respectively.

5. The PLC-based sewage treatment dosing control system according to claim 1 is characterized in that: The output data of the dosing control module is determined based on the outputs of the dosing parameter analysis module, the dosing phosphorus removal control module, the aeration flow control module and the dosing adjustment module. The dosing parameter analysis module is specifically used to: Generate the corresponding relationship between dosage and multiple pre-parameters based on historical dosage data; The multiple water quality parameters and pre-set parameters detected in real time are substituted into the corresponding relationship to obtain the preset control parameters for determining the dosage.

6. The PLC-based sewage treatment dosing control system according to claim 5 is characterized in that: The dosing and phosphorus removal control module is specifically used for: Taking the water inflow and the multiple water quality parameters as input signals, the reaction process of removing multiple harmful substances in the sewage treatment process is simulated by fuzzy PID algorithm to obtain the calculation results of the distribution state and change state of the concentration of multiple substance indicators; The preset control parameter is corrected according to the calculation result to correct the calculated dosage.

7. The PLC-based sewage treatment dosing control system according to claim 5 is characterized in that: The aeration flow control module is specifically used for: Calculating the gas demand according to the water intake and the multiple water quality parameters; The aeration flow rate is automatically controlled according to the air demand.

8. The PLC-based sewage treatment dosing control system according to claim 5 is characterized in that: The dosage adjustment module comprises: A dosage setting and adjustment module is used to adjust the pre-set parameters and the preset control parameters according to the deviation of the water quality parameters detected in real time in the effluent water; The dosage feedback adjustment module is used to quickly and continuously adjust the real-time dosage of the agent according to the water intake based on the speed regulation mechanism of the frequency converter and the automatic control mechanism of the PLC, so as to match the actual dosage with the set value.

9. The PLC-based sewage treatment dosing control system according to claim 1 is characterized in that: The central control system module includes: 1 display screen and control computer, 1 communication management machine, 2 network printers, 5 operation stations, 2 engineer stations, 2 data servers, SCADA monitoring software and data platform.

10. The PLC-based sewage treatment dosing control system according to claim 9, characterized in that: The central control system module is specifically used for: The display screen dynamically displays the real-time sewage treatment screen, the working status of each device and each water quality parameter, and when a fault occurs, the monitored fault is recorded according to the preset priority level and an audible and visual alarm is issued; Based on the human-computer interaction interface, it provides the staff with sewage treatment summary data and comprehensive evaluation data on the sewage treatment effect of the dosing control system.

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