Digital control-based automatic pH value regulating system for printing and dyeing industrial wastewater

Abstract

The application provides a kind of digital control-based printing and dyeing industrial wastewater pH value automatic regulation system, including pH value detection module, data processing module, control module and regulator dosing module, realizes the real-time monitoring and accurate control of printing and dyeing industrial wastewater pH value, effectively avoids the problem of unstable biological treatment effect caused by pH value fluctuation, through accurate sensor and advanced control algorithm, system can obtain wastewater pH value data in real time, and automatically calculate the adjustment amount, so as to ensure that wastewater pH value always remains in the best processing range, improves the efficiency and stability of wastewater treatment, traditional manual adjustment mode not only time-consuming and labor-consuming, but also difficult to ensure the accuracy and timeliness of adjustment, and the system can automatically adjust the adjustment amount according to real-time data, realizes the continuity and stability of wastewater treatment, improves the overall processing efficiency.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to an automated pH adjustment system for dyeing and printing industrial wastewater based on digital control. Background Technology

[0002] In traditional manual methods, workers need to periodically sample and test the pH value of wastewater and manually add acid or alkali reagents to adjust it based on the test results. This method is not only inefficient but also easily affected by human factors, leading to unstable adjustment results. Furthermore, manual operation carries certain safety risks, such as the potential for secondary environmental pollution from the misuse or overuse of acid or alkali reagents.

[0003] In terms of basic automation, some dyeing and printing enterprises have adopted simple pH monitoring and control systems. These systems typically monitor the pH value of wastewater in real time through sensors and automatically add acid and alkali reagents through simple control logic. However, these systems have a low level of intelligence and often can only achieve single adjustment functions, failing to perform intelligent optimization based on wastewater composition and process requirements.

[0004] In summary, existing technologies have certain limitations and shortcomings in pH adjustment of dyeing and printing industrial wastewater. Manual operation methods are inefficient and prone to errors, while rudimentary automation methods, although improving adjustment efficiency, have limited intelligence and cannot meet the complex and diverse needs of dyeing and printing industrial wastewater treatment. Therefore, developing a more advanced and intelligent automated pH adjustment system for dyeing and printing industrial wastewater is of great significance for improving wastewater treatment efficiency, reducing treatment costs, and protecting the environment. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides an automated pH adjustment system for dyeing and printing industrial wastewater based on digital control, which solves the problems mentioned in the background section.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an automated pH adjustment system for dyeing and printing industrial wastewater based on digital control, comprising a pH detection module, a data processing module, a control module, and a regulator dosing module. The pH detection module detects the pH value of the dyeing and printing industrial wastewater in real time using a pH sensor and transmits the detection data to the data processing module. The data processing module receives the data sent by the pH detection module, processes and analyzes it in real time, calculates the deviation between the current pH value and the set value, and finally sends the processing result to the control module. The control module calculates the dosage of regulator based on the processing result sent by the data processing module using a preset algorithm and controls the regulator dosing module to perform precise dosing. The regulator dosing module adds an appropriate amount of regulator to the wastewater according to the instructions issued by the control module through an execution structure.

[0007] Preferably, the execution structure includes a metering pump, a regulator storage tank, a delivery pipeline, a solenoid valve, a mixing device, and a feedback device. The metering pump is used to precisely control the dosage of the regulator. Based on instructions from the control module, the metering pump adjusts its displacement and rotation speed to achieve precise control of the regulator dosage. The regulator storage tank stores the regulator to be added and is equipped with a level gauge and a level switch to monitor the remaining amount of regulator and replenish it promptly. The delivery pipeline connects the regulator storage tank and the metering pump, used to deliver the regulator from the storage tank to the metering pump. The solenoid valve controls the opening and closing of the regulator addition pipeline. When the control module issues a dosing instruction, the solenoid valve opens, allowing the regulator to enter the wastewater treatment system through the pipeline; when no addition is needed, the solenoid valve closes to prevent regulator leakage. The mixing device is located next to the regulator addition point to fully mix the added regulator and wastewater, accelerating the regulator's reaction speed and improving the regulating effect. The feedback device monitors the regulator addition in real time and reports the dosing status back to the control module.

[0008] Preferably, it also includes a display module, which is used to display the current pH value, set value and dosage of regulator of the wastewater in real time.

[0009] Preferably, the preset algorithm includes a dynamic regulator dosage calculation model based on multivariate input and feedback, and the control module considers the target concentration. Current concentration ,flow ,temperature pH value and previous dosage ,

[0010] in, , , , , and All are constants, representing the weights of different factors on the dosage. and These represent reference values ​​for temperature and pH, respectively. The formula above, which represents the base of the natural logarithm, is a model that combines linear, exponential, and feedback mechanisms. It considers the difference between the target concentration and the current concentration, the relationship between flow rate and temperature, the influence of pH value, and the feedback of the previous dosage. When considering the relationship between flow rate and temperature, it simulates the effect of temperature on flow rate through an exponential function. Such a model can more comprehensively reflect the influence of various factors on the dosage of regulator in the actual process.

[0011] Preferably, the pH sensor measures pH value by relying on the potential difference change between a glass electrode and a reference electrode. The core of the pH sensor is a glass electrode containing a sensitive membrane selectively sensitive to hydrogen ions (H+). When the pH sensor is immersed in wastewater, the sensitive membrane reacts with the hydrogen ions in the wastewater to generate a potential difference proportional to the hydrogen ion concentration (i.e., pH value). This potential difference is then converted into a current or voltage signal, amplified by electronic circuitry, and finally outputs an electrical signal corresponding to the pH value of the wastewater. The pH sensor is also equipped with a reference electrode, which provides a stable potential reference for the measurement process, thereby eliminating potential drift.

[0012] Preferably, the data processing module filters, amplifies, and digitizes the received electrical signal to eliminate noise and extract valid current pH data. Then, it subtracts the current pH value from the set pH value to obtain the pH deviation. By continuously monitoring and calculating the pH deviation, the data processing module evaluates the changes in the pH value of the wastewater in real time.

[0013] Preferably, the metering pump is made of corrosion-resistant material to accommodate corrosive substances that may be present in the wastewater from the dyeing and printing industry.

[0014] Preferably, the conveying pipeline is made of corrosion-resistant and wear-resistant materials to ensure the stability and safety of the conveying process.

[0015] Preferably, the mixing device is in the form of a stirrer, a jet injector, or a static mixer.

[0016] (III) Beneficial Effects This invention provides an automated pH adjustment system for dyeing and printing industrial wastewater based on digital control. It has the following beneficial effects: 1. This solution enables real-time monitoring and precise control of the pH value of dyeing and printing industrial wastewater, effectively avoiding the problem of unstable biological treatment effect caused by pH fluctuations. Through precise sensors and advanced control algorithms, the system can acquire wastewater pH data in real time and automatically calculate the adjustment amount, thereby ensuring that the wastewater pH value is always kept within the optimal treatment range; 2. This solution greatly improves the efficiency and stability of wastewater treatment. Traditional manual adjustment methods are not only time-consuming and labor-intensive, but also difficult to guarantee the accuracy and timeliness of adjustment. In contrast, this system can automatically adjust the adjustment amount based on real-time data, realizing the continuity and stability of wastewater treatment and improving the overall treatment efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the system structure of the present invention. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0019] The present invention will now be described in further detail with reference to the accompanying drawings: This invention provides an automated pH adjustment system for dyeing and printing industrial wastewater based on digital control, such as... Figure 1 As shown, it includes a pH detection module, a data processing module, a control module, and a regulator dosing module. The pH detection module uses a pH sensor to detect the pH value of dyeing and printing industrial wastewater in real time and sends the detection data to the data processing module. The data processing module receives data sent by the pH detection module, performs real-time processing and analysis, calculates the deviation between the current pH value and the set value, and finally sends the processing result to the control module. Based on the processing results sent by the data processing module, the control module calculates the dosage of the regulator using a preset algorithm and controls the regulator dosing module to perform precise dosing. The regulator dosing module adds an appropriate amount of regulator to the wastewater according to the instructions issued by the control module through the execution structure.

[0020] The actuator includes a metering pump, a regulator storage tank, a delivery pipeline, a solenoid valve, a mixing device, and a feedback device. The metering pump is used to precisely control the dosage of the regulator. According to the instructions issued by the control module, the metering pump achieves precise control of the dosage of the regulator by adjusting the displacement and speed. The regulator storage tank is used to store the regulator to be added. It is equipped with a level gauge and a level switch to monitor the remaining amount of regulator and replenish it in a timely manner. The delivery pipeline connects the regulator storage tank and the metering pump, and is used to deliver the regulator from the storage tank to the metering pump; The solenoid valve is used to control the opening and closing of the regulator dosing pipeline. When the control module issues a dosing command, the solenoid valve opens, allowing the regulator to enter the wastewater treatment system through the pipeline. When dosing is not required, the solenoid valve closes to prevent regulator leakage. The mixing device is located next to the regulator dosing point to fully mix the added regulator and wastewater, thereby accelerating the regulator's reaction speed and improving the regulating effect. The mixing device can take the form of an agitator, ejector, or static mixer. The feedback device is used to detect the addition of the regulator in real time and report the addition status to the control module.

[0021] It also includes a display module, which is used to display the current pH value, set value and regulator dosage of the wastewater in real time.

[0022] The preset algorithm includes a dynamic regulator dosage calculation model based on multivariate inputs and feedback, and the control module considers the target concentration. Current concentration ,flow ,temperature pH value and previous dosage ,

[0023] in, , , , , and All are constants, representing the weights of different factors on the dosage. and These represent reference values ​​for temperature and pH, respectively. The formula above, which represents the base of the natural logarithm, is a model that combines linear, exponential, and feedback mechanisms. It considers the difference between the target concentration and the current concentration, the relationship between flow rate and temperature, the influence of pH value, and the feedback of the previous dosage. When considering the relationship between flow rate and temperature, it simulates the effect of temperature on flow rate through an exponential function. Such a model can more comprehensively reflect the influence of various factors on the dosage of regulator in the actual process.

[0024] pH sensors measure pH values ​​by relying on the potential difference between a glass electrode and a reference electrode. The core of the pH sensor is a glass electrode containing a sensitive membrane selectively sensitive to hydrogen ions (H+). When the pH sensor is immersed in wastewater, the sensitive membrane reacts with the hydrogen ions in the wastewater, generating a potential difference proportional to the hydrogen ion concentration (i.e., pH value). This potential difference is then converted into a current or voltage signal, amplified by electronic circuitry, and finally output as an electrical signal corresponding to the pH value of the wastewater. The pH sensor is also equipped with a reference electrode, which provides a stable potential reference for the measurement process, thereby eliminating potential drift.

[0025] The data processing module filters, amplifies, and digitizes the received electrical signal to eliminate noise and extract valid current pH data. Then, it subtracts the current pH value from the set pH value to obtain the pH deviation. By continuously monitoring and calculating the pH deviation, the data processing module evaluates the changes in the pH value of the wastewater in real time.

[0026] In practical applications, pH sensors are installed at appropriate locations in the wastewater treatment process to monitor the pH value of the wastewater in real time. The data acquisition module is responsible for receiving the signals from the pH sensors and converting them into digital signals for subsequent processing.

[0027] The control module is the core of the entire system. It receives pH data transmitted from the data acquisition module and performs calculations according to a preset algorithm. In this embodiment, the control module adopts a fuzzy logic-based control algorithm, which can automatically calculate the required adjustment amount based on real-time pH data and the set pH range.

[0028] The regulator dosing module automatically adjusts the working state of the actuator according to the adjustment amount command output by the control module, thereby realizing the automatic adjustment of the pH value of wastewater.

[0029] The user interface provides a human-computer interaction interface, which makes it convenient for operators to monitor parameters such as pH value and adjustment amount of wastewater in real time, and can set and adjust the system as needed.

[0030] The operational experiment of this embodiment is as follows: First, the system is built and a digitally controlled automated pH adjustment system for dyeing and printing industrial wastewater is installed, including key components such as sensors, controllers, and actuators. The system is then debugged to ensure accurate sensor measurements, rapid controller response, and reliable actuator operation. A sample of dyeing and printing industrial wastewater is prepared, an initial pH range is set, and experimental data is prepared for recording. After the system is started, the pH of the wastewater sample is automatically adjusted, and data changes during the adjustment process are recorded. After the experiment, the recorded data is organized, including adjustment time and pH change curves.

[0031] The experimental conditions were: temperature 25°C, humidity approximately 50% to minimize the influence of environmental factors on the results. Actual wastewater samples from the dyeing and printing industry were used, with an initial pH range of 5-9. The experimental results are as follows.

[0032] Analysis of adjustment effect: Experimental data shows that the automated pH adjustment system for dyeing and printing industrial wastewater based on digital control can accurately and quickly adjust the pH value of the wastewater to the set value (7.0 in this experiment). Under different initial pH conditions, the system can complete the adjustment task in a short time, proving the feasibility of the system.

[0033] Stability Analysis: During the experiment, the system exhibited good stability. The sensor measurements were accurate, the controller responded quickly, and the actuator operated reliably. The pH value change curve was smooth, with no obvious fluctuations or abnormalities.

[0034] Practicality Analysis: This system employs digital control, achieving automated adjustment, reducing the tedium of manual operation, and improving processing efficiency. Furthermore, the system possesses high adaptability and scalability, capable of meeting the needs of various wastewater treatment scenarios.

[0035] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An automated pH adjustment system for dyeing and printing industrial wastewater based on digital control, characterized in that... It includes a pH detection module, a data processing module, a control module, and a regulator dosing module. The pH detection module uses a pH sensor to detect the pH value of the dyeing and printing industrial wastewater in real time and sends the detection data to the data processing module. The data processing module receives the data sent by the pH detection module, performs real-time processing and analysis, calculates the deviation between the current pH value and the set value, and finally sends the processing result to the control module. The control module calculates the dosage of the regulator based on the processing result sent by the data processing module using a preset algorithm, and controls the regulator dosing module to perform precise dosing. The regulator dosing module adds an appropriate amount of regulator to the wastewater according to the instructions issued by the control module through an execution structure. The preset algorithm includes a dynamic regulator dosage calculation model based on multivariate input and feedback, and the control module considers the target concentration. Current concentration ,flow ,temperature pH value and previous dosage , ； in, , , , , and All are constants, representing the weights of different factors on the dosage. and These represent reference values ​​for temperature and pH, respectively. It represents the base of the natural logarithm.

2. The automated pH adjustment system for dyeing and printing industrial wastewater based on digital control according to claim 1, characterized in that... : The execution structure includes a metering pump, a regulator storage tank, a delivery pipeline, a solenoid valve, a mixing device, and a feedback device. The metering pump is used to precisely control the dosage of the regulator. According to the instructions issued by the control module, the metering pump achieves precise control of the dosage of the regulator by adjusting its displacement and rotation speed. The regulator storage tank is used to store the regulator to be added, and is equipped with a level gauge and a level switch to monitor the remaining amount of regulator and replenish it in a timely manner; The delivery pipeline connects the regulator storage tank and the metering pump, and is used to deliver the regulator from the storage tank to the metering pump; The solenoid valve is used to control the opening and closing of the regulator dosing pipeline. When the control module issues a dosing command, the solenoid valve opens, allowing the regulator to enter the wastewater treatment system through the pipeline. When dosing is not required, the solenoid valve closes to prevent regulator leakage. The mixing device is located next to the regulator addition point to fully mix the regulator and wastewater during the injection process, thereby accelerating the reaction rate of the regulator and improving the regulating effect. The feedback device is used to detect the addition of the regulator in real time and report the addition status to the control module.

3. The automated pH adjustment system for dyeing and printing industrial wastewater based on digital control according to claim 1, characterized in that... : It also includes a display module, which is used to display the current pH value, set value and dosage of regulator of the wastewater in real time.

4. The automated pH adjustment system for dyeing and printing industrial wastewater based on digital control according to claim 1, characterized in that... : The pH sensor measures pH value by relying on the potential difference change between a glass electrode and a reference electrode. The core of the pH sensor is a glass electrode containing a sensitive membrane selectively sensitive to hydrogen ions. When the pH sensor is immersed in wastewater, the sensitive membrane reacts with the hydrogen ions in the wastewater, generating a potential difference proportional to the hydrogen ion concentration. This potential difference is then converted into a current or voltage signal, amplified by electronic circuitry, and finally outputs an electrical signal corresponding to the pH value of the wastewater. The pH sensor is also equipped with a reference electrode, which provides a stable potential reference for the measurement process, thereby eliminating potential drift.

5. The automated pH adjustment system for dyeing and printing industrial wastewater based on digital control according to claim 1, characterized in that... : The data processing module filters, amplifies, and digitizes the received electrical signal to eliminate noise and extract valid current pH data. Then, it subtracts the current pH value from the set pH value to obtain the pH deviation. By continuously monitoring and calculating the pH deviation, the data processing module evaluates the changes in the pH value of the wastewater in real time.

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