Automatic adjusting system for pH value of printing and dyeing industrial wastewater based on digital control

Abstract

The invention provides a digital control-based printing and dyeing industrial wastewater pH value automatic regulation system, which comprises a pH value detection module, a data processing module, a control module and a regulator adding module, realizes real-time monitoring and accurate control of the printing and dyeing industrial wastewater pH value, effectively avoids the problem of unstable biological treatment effect caused by pH value fluctuation, and improves the quality of the printing and dyeing industrial wastewater. Through an accurate sensor and an advanced control algorithm, the system can obtain wastewater pH value data in real time and automatically calculate the adjusting amount, so that the wastewater pH value is always kept in an optimal treatment range, the wastewater treatment efficiency and stability are improved, and a traditional manual adjustment mode is time-consuming, labor-consuming, time-saving and labor-saving. The system can automatically adjust the adjusting amount according to real-time data, so that the continuity and stability of wastewater treatment are realized, and the overall treatment efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater treatment, in particular to an automatic pH value regulating system for wastewater from a printing and dyeing industry based on digital control. Background Art

[0002] In the traditional manual operation method, workers need to regularly sample and test the pH value of wastewater, and manually add acid and alkali reagents to adjust it according to the test results. This method is not only inefficient, but also easily affected by human factors, resulting in unstable adjustment results. In addition, manual operation also has certain safety risks, such as the misuse or excessive use of acid and alkali reagents may cause secondary pollution to the environment.

[0003] In terms of primary automation, some printing and dyeing enterprises have adopted simple pH monitoring and control systems. These systems usually monitor the pH value of wastewater in real time through sensors and realize the automatic addition of acid and alkali reagents through simple control logic. However, these systems have a low degree of intelligence and can often only realize a single adjustment function, and cannot be intelligently optimized according to wastewater composition and process requirements.

[0004] In summary, the existing technology has certain limitations and deficiencies in regulating the pH value of printing and dyeing industrial wastewater. The manual operation method is inefficient and prone to errors. Although the primary automation method improves the regulation efficiency, the degree of intelligence is limited and it is difficult to meet the complexity and diversity requirements of printing and dyeing industrial wastewater treatment. Therefore, the development of a more advanced and intelligent automatic pH value regulation system for printing and dyeing industrial wastewater is of great significance for improving wastewater treatment efficiency, reducing treatment costs and protecting the environment. Summary of the invention

[0005] 1. Technical issues to be resolved

[0006] In view of the deficiencies in the prior art, the present invention provides an automatic pH value adjustment system for wastewater from printing and dyeing industries based on digital control, which solves the problems raised in the above-mentioned background technology.

[0007] (II) Technical solution

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions: a digitally controlled automatic pH adjustment system for printing and dyeing industrial wastewater, comprising a pH detection module, a data processing module, a control module and a regulator dosing module, wherein the pH detection module detects the pH value of the printing and dyeing industrial wastewater in real time through a pH sensor and sends the detection data to the data processing module; the data processing module receives the data sent by the pH detection module, and 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 through a preset algorithm according to the processing result sent by the data processing module, and controls the regulator dosing module to perform precise dosing; the regulator dosing module adds an appropriate amount of regulator to the wastewater through an execution structure according to the instructions issued by the control module.

[0009] 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 accurately control the dosage of the regulator. The metering pump realizes accurate control of the dosage of the regulator by adjusting the displacement and the rotation speed according to the instruction issued by the control module; the regulator storage tank is used to store the regulator to be added, and is provided with a liquid level meter and a liquid level switch to monitor the remaining amount of the regulator and replenish it in time; the delivery pipeline connects the regulator storage tank and the metering pump, and is used to transport the regulator from the storage tank to the metering pump; the solenoid valve is used to control the on-off of the regulator addition pipeline. When the control module issues an addition instruction, the solenoid valve opens to allow the regulator to enter the wastewater treatment system through the pipeline. When no addition is required, the solenoid valve is closed to prevent leakage of the regulator; the mixing device is arranged next to the regulator addition point to fully mix the added regulator and wastewater to accelerate the reaction speed of the regulator and improve the regulation effect; the feedback device is used to detect the addition of the regulator in real time and feedback the addition to the control module.

[0010] Preferably, 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.

[0011] Preferably, the preset algorithm includes a dynamic regulator dosage calculation model based on multivariable input and feedback, and the control module considers the target concentration C target , current concentration C cuttent , flow rate Q, temperature T, pH value pH and previous dosage D prev ,

[0012]

[0013] Among them, K1, K2, K3, K4, K5 and K6 are all constants, representing the weights of the influence of different factors on the dosage, T ref and pH ref Respectively represent the reference values ​​of temperature and pH, e represents the base of natural logarithm. The above formula is a model that combines linear relationship, exponential relationship and feedback mechanism. It takes into account the difference between target concentration and 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, the influence of temperature on flow rate is simulated by exponential function. Such a model can more comprehensively reflect the influence of various factors on the dosage of regulator in the actual process.

[0014] Preferably, the pH sensor relies on the change in the potential difference between a glass electrode and a reference electrode to measure the pH value. The core of the pH sensor is a glass electrode, and the glass electrode contains a layer of sensitive membrane that is selective for hydrogen ions (H+). When the pH sensor is immersed in wastewater, the sensitive membrane reacts with the hydrogen ions of the pulmonary edema to generate a potential difference proportional to the hydrogen ion concentration (i.e., the pH value). The potential difference is then converted into a current or voltage signal and amplified by an electronic circuit to ultimately output 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.

[0015] Preferably, the data processing module filters, amplifies and digitally converts the received electrical signal to eliminate noise and extract valid current pH value data, and then uses the set pH value to subtract the current pH value to obtain the pH deviation. By continuously monitoring and calculating the pH deviation, the data processing module implements the evaluation of changes in the pH value of the wastewater.

[0016] Preferably, the metering pump is made of corrosion-resistant material to adapt to the corrosive substances that may exist in the wastewater of the printing and dyeing industry.

[0017] Preferably, the conveying pipeline is made of corrosion-resistant and wear-resistant materials to ensure the stability and safety of the conveying process.

[0018] Preferably, the mixing device is in the form of an agitator, an ejector or a static mixer.

[0019] (III) Beneficial effects

[0020] The invention provides a digital control-based automatic pH value regulating system for wastewater from printing and dyeing industries.

[0021] It has the following beneficial effects:

[0022] 1. This solution realizes real-time monitoring and precise control of the pH value of printing and dyeing industrial wastewater, effectively avoiding the problem of unstable biological treatment effect caused by pH value fluctuations. Through precise sensors and advanced control algorithms, the system can obtain wastewater pH value 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;

[0023] 2. This solution greatly improves the efficiency and stability of wastewater treatment. The traditional manual adjustment method is not only time-consuming and labor-intensive, but also difficult to ensure the accuracy and timeliness of the adjustment. The system can automatically adjust the adjustment amount according to real-time data, thereby achieving the continuity and stability of wastewater treatment and improving the overall treatment efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the system structure of the present invention. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0026] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0027] The embodiment of the present invention provides a system for automatically adjusting the pH value of wastewater from printing and dyeing industries based on digital control, such as Figure 1 As shown, it includes a pH value detection module, a data processing module, a control module and a regulator dosing module.

[0028] The pH value detection module detects the pH value of the printing and dyeing industrial wastewater in real time through a pH sensor and sends the detection data to the data processing module;

[0029] The data processing module receives the data sent by the pH value 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 results to the control module;

[0030] The control module calculates the dosage of the regulator through a preset algorithm according to the processing results sent by the data processing module, and controls the regulator dosing module to accurately dosing;

[0031] The regulator dosing module adds an appropriate amount of regulator into the wastewater through the execution structure according to the instructions issued by the control module.

[0032] 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 accurately control the dosage of the regulator. The metering pump realizes accurate control of the dosage of the regulator by adjusting the displacement and the speed according to the instructions issued by the control module.

[0033] The regulator storage tank is used to store the regulator to be added, and is equipped with a liquid level meter and a liquid level switch to monitor the remaining amount of the regulator and replenish it in time;

[0034] 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;

[0035] The solenoid valve is used to control the on-off of the regulator dosing pipeline. When the control module issues a dosing instruction, the solenoid valve opens to allow the regulator to enter the wastewater treatment system through the pipeline. When dosing is not required, the solenoid valve closes to prevent the regulator from leaking. The mixing device is located next to the regulator dosing point to fully mix the added regulator and wastewater to accelerate the reaction speed of the regulator and improve the regulation effect. The mixing device can be in the form of an agitator, an ejector or a static mixer;

[0036] The feedback device is used to detect the dosage of the regulator in real time and feed back the dosage to the control module.

[0037] 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.

[0038] The preset algorithm includes a dynamic regulator dosage calculation model based on multi-variable input and feedback, and the control module considers the target concentration C target , current concentration C cuttent , flow rate Q, temperature T, pH value pH and previous dosage D prev ,

[0039]

[0040] Among them, K1, K2, K3, K4, K5 and K6 are all constants, representing the weights of the influence of different factors on the dosage, T ref and pH ref Respectively represent the reference values ​​of temperature and pH, e represents the base of natural logarithm. The above formula is a model that combines linear relationship, exponential relationship and feedback mechanism. It takes into account the difference between target concentration and 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, the influence of temperature on flow rate is simulated by exponential function. Such a model can more comprehensively reflect the influence of various factors on the dosage of regulator in the actual process.

[0041] The pH sensor relies on the change in potential difference between the glass electrode and the reference electrode to measure the pH value. The core of the pH sensor is a glass electrode, which contains a sensitive membrane that is selective for 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). The potential difference is then converted into a current or voltage signal and amplified by an electronic circuit to ultimately output 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.

[0042] The data processing module filters, amplifies and digitally converts the received electrical signal to eliminate noise and extract valid current pH value data. It then uses the set pH value to subtract the current pH value to obtain the pH deviation. By continuously monitoring and calculating the pH deviation, the data processing module evaluates the changes in the wastewater pH value.

[0043] In practical applications, pH sensors are installed at appropriate locations in the wastewater treatment process to detect the pH value of wastewater in real time. The data acquisition module is responsible for receiving the signal from the pH sensor and converting it into a digital signal for subsequent processing.

[0044] The control module is the core of the whole system. It receives the pH value data transmitted by the data acquisition module and performs calculations according to a preset algorithm. In this embodiment, the control module adopts a control algorithm based on fuzzy logic, which can automatically calculate the required adjustment amount according to the real-time pH value data and the set pH value range.

[0045] The regulator dosing module automatically adjusts the working state of the execution structure according to the regulation quantity instruction output by the control module, thereby realizing automatic regulation of the pH value of the wastewater.

[0046] The user interface provides a human-computer interaction interface, which allows operators to monitor wastewater pH value, adjustment amount and other parameters in real time, and can set and adjust the system as needed.

[0047] The operation experiment of this embodiment is as follows: first, the system is built, and the automatic pH value adjustment system of printing and dyeing industrial wastewater based on digital control is installed, including key components such as sensors, controllers, and actuators; the system is debugged to ensure that the sensor measurement is accurate, the controller responds quickly, and the actuator operates reliably; printing and dyeing wastewater samples are prepared, the initial pH value range is set, and the experimental data is prepared to be recorded; after starting the system, the pH value of the wastewater sample is automatically adjusted, and the data changes during the adjustment process are recorded; after the experiment, the recorded data is sorted, including the adjustment time and the pH value change curve.

[0048] The experimental conditions are as follows: temperature 25℃, humidity about 50%, to reduce the influence of environmental factors on the experimental results. The wastewater samples are actual printing and dyeing industrial wastewater samples, and the initial pH value ranges from 5 to 9. The experimental results are as follows:

[0049] Experiment No. Initial pH Adjustment time (min) Final pH 1 5.2 15 7.0 2 6.8 12 7.0 3 8.5 18 7.0 4 5.5 16 7.0 5 7.2 10 7.0

[0050] Analysis of regulation effect: From the experimental data, it can be seen that the digitally controlled automatic regulation system for wastewater pH value in printing and dyeing industry can accurately and quickly adjust the wastewater pH value to the set value (7.0 in this experiment). Under different initial pH conditions, the system can complete the regulation task in a relatively short time, which proves the feasibility of the system.

[0051] Stability analysis: During the experiment, the system showed good stability. The sensor measured accurately, the controller responded quickly, and the actuator acted reliably. The pH value change curve was smooth, without obvious fluctuations or abnormalities.

[0052] Practicality analysis: This system adopts digital control to achieve automatic adjustment, reduce the tediousness of manual operation, and improve treatment efficiency. At the same time, the system has high adaptability and scalability, and can meet the needs of different wastewater treatment scenarios.

[0053] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automatic pH value adjustment system for printing and dyeing industrial wastewater based on digital control, characterized by: It includes pH value detection module, data processing module, control module and regulator dosing module. The pH value detection module detects the pH value of the printing and dyeing industrial wastewater in real time through a pH sensor and sends the detection data to the data processing module; The data processing module receives the data sent by the pH value 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 through a preset algorithm according to the processing result sent by the data processing module, and controls the regulator dosing module to perform precise dosing; The regulator dosing module adds an appropriate amount of regulator into the wastewater through an execution structure according to the instruction issued by the control module.

2. According to claim 1, a digitally controlled automatic pH value adjustment system for printing and dyeing industrial wastewater is characterized by: 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 accurately control the dosage of the regulator. The metering pump realizes accurate control of the dosage of the regulator by adjusting the displacement and the rotation speed according to the instructions issued by the control module. The regulator storage tank is used to store the regulator to be added, and is provided with a liquid level meter and a liquid level switch to monitor the remaining amount of the regulator and replenish it in time; 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 on-off of the regulator dosing pipeline. When the control module issues a dosing instruction, the solenoid valve opens to allow the regulator to enter the wastewater treatment system through the pipeline. When dosing is not required, the solenoid valve closes to prevent leakage of the regulator. The mixing device is arranged beside the regulator dosing point and is used to fully mix the added regulator and wastewater to accelerate the reaction speed of the regulator and improve the regulation effect; The feedback device is used to detect the dosage of the regulator in real time and feed back the dosage to the control module.

3. The automatic pH value adjustment system for printing and dyeing industrial wastewater based on digital control according to claim 1 is characterized in that: 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.

4. The automatic pH value adjustment system for printing and dyeing industrial wastewater based on digital control according to claim 1 is characterized in that: The preset algorithm includes a dynamic regulator dosage calculation model based on multi-variable input and feedback, and the control module considers the target concentration C target , current concentration C cuttent , flow rate Q, temperature T, pH value pH and previous dosage D prev , Among them, K1, K2, K3, K4, K5 and K6 are all constants, representing the weights of different factors affecting the dosage, T ref and pH ref represent the reference values ​​of temperature and pH respectively, and e represents the base of natural logarithm.

5. The automatic pH value adjustment system for printing and dyeing industrial wastewater based on digital control according to claim 1 is characterized in that: The pH sensor relies on the change in potential difference between a glass electrode and a reference electrode to measure the pH value. The core of the pH sensor is a glass electrode, which contains a layer of sensitive membrane that is selective for hydrogen ions (H+). When the pH sensor is immersed in wastewater, the sensitive membrane reacts with the hydrogen ions of the pulmonary edema to generate a potential difference proportional to the hydrogen ion concentration (i.e., the pH value). The potential difference is then converted into a current or voltage signal and amplified by an electronic circuit to ultimately output 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.

6. The automatic pH value adjustment system for printing and dyeing industrial wastewater based on digital control according to claim 1 is characterized by: The data processing module filters, amplifies and digitally converts the received electrical signal to eliminate noise and extract valid current pH value data, and then uses the set pH value to subtract the current pH value to obtain the pH deviation. By continuously monitoring and calculating the pH deviation, the data processing module implements the evaluation of the change of the wastewater pH value.

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